The Basic Principle of Magnetic Separation

Because of the different magnetism among the minerals, the magnetic force they bear is also different when they enter the magnetic field of the magnetic separation equipment (magnetic separator) , and thus the trajectories is different. And finally the minerals will be divided into magnetic product and the non-magnetic product (or ferromagnetic products and products with weak magnetism), achieving magnetic separation.
Mineral magnetic differences are the basis of magnetic separation. The magnetism of minerals can be measured and the minerals can be divided into three categories according to the degree of magnetic strength of the mineral : (1) strong magnetism minerals, such as magnetite, pyrrhotite, the number of such minerals is small; (2) weak magnetism minerals, such as hematite, limonite, ilmenite, psilomelane pyrolusite, garnet, the number of these minerals is larger; (3) non-magnetic minerals, most of the non-metallic minerals and non-ferrous minerals belong to this category. In the magnetic field of the magnetic separator, the ferromagnetic minerals suffer the maximum magnetic force, the weak magnetism minerals suffer smaller magnetic force and the non-magnetic minerals bear no magnetic force or weak magnetic force.
The magnetic field of the magnetic separator is a necessary condition of the magnetic separation. The magnetic field can be classified into the uniform magnetic field and nonuniform magnetic field. And the degree of nonuniformity of the magnetic field can be measured with the magnetic field gradient, which is the changing rate of the magnetic field strength along the space, i.e. the unit length variation amount of the magnetic field strength. The greater the magnetic field gradient is, the greater the degree of nonuniformity of the magnetic field will be, that is, rate of change of magnetic field strength along the space is large. The magnetic force that the magnetic ore particles bear is proportional to the product of the magnetic field strength and the magnetic field gradient. If the magnetic field gradient is equal to zero (in the uniform magnetic field, no matter how high the magnetic field strength is, the magnetic field gradients are equal to zero) and then the magnetic force that the magnetic mineral grains stand is zero and the magnetic separation can not be carried out.

Sand washing equipment : http://www.best-crushers.com/sandwasher.htm
China cement mill : http://www.ore-machine.com/cement-mill.html 

The Performance Features and Overhaul of Jaw Breaker

From the introduction to obtain the stability of the market, as for the jaw crusher, there are a lot of technological innovation and improvements. After the comprehensive combination of the performance of other crushing equipment, the following aspects are the performance characteristics of the jaw crushers:
1. Crushing chamber of the jaw breaker is deep and there is no dead zone, which increases the feeding capacity and output; large crushing ratio and uniform particle size;
2. It is easy to adjust the Gasket-discharge opening, reliable and convenient, large adjustment range, increasing the flexibility of the device;
3. Lubrication system is safe and reliable; it is easy to replace the parts; maintenance workload is small; simple structure, reliable operation, low operating costs.
4. Energy-saving: the energy-saving of the stand-alone can be reach 15% to 30%, the system can save more than doubled; the adjustment range of the discharging opening is large, which can meet the different requirements of users ; low noise, less dust.
The overhaul of the jaw crusher: after working for a period of time, any machinery needs maintenance, the damaged parts need replacing and the seriously worn ones need maintenance, which is the way to keep the long service life of the machine. Jaw crusher is to be overhauled according to the way of maintenance. In order to ensure the normal work of the jaw crusher, in addition to the proper operation, it is necessary to conduct the planned maintenance, including routine maintenance checks, minor repairs, medium repair and overhaul.
(1) Minor repairs: the main contents include the check and fix of the adjusting device, the gap of high-speed discharge opening and the replacement of the worn liner. Overhauling the transmission parts, lubrication systems and replacing the lubricants. The cycle of the minor repair is about 1-3 months.
(2) Medium repair: apart from all the work of minor repairs, the medium repair also includes the replacement of the thrust plate, lining, inspection and repair of bearing bush. Repair cycle is generally about 1-2 years.
(3) Overhaul: in addition to the work of medium repair, it includes the replacement of the eccentric shaft and moving jaw mandrel, the casting of the Babbitt metal on the rod head and the replacement or repair of all worn parts. Generally, overhaul cycle is about five years.

Mobile crushing station : http://www.mine-crusher.com/mobile-crusher.html
Iron ore concentrator : http://www.crusher-export.com/ore-beneficiation.html

The Optimum Time for Feeding of Rotary Kiln

Due to the reliable production and the wide application range, the rotary kiln is favored by the majority of customers. However, it is important to know some professional knowledge before operating the rotary kiln. Just taking the feeding of the rotary kiln as an example, what is the best time of the feeding?
Before the feeding, the burning zone and calciner in the rotary kiln should be fully preheated kiln, when increasing the air drafting in the kiln end, the oil injection of the kiln head and calciner should generally be appropriately increased so that the coal powder fire. When feeding, the operator must master the time lag between the ventilation and feeding. If the ventilation time is too early, the preheater temperature of the rotary kiln will be too high; if the ventilation is too late, the materials sedimentation could easily lead to the clogging. Generally, the feeding is conducted when the negative pressure is up to 1500pa, if the temperature is too high, the re-start cannot be conducted until the temperature is down. When feeding, in a short period of time, there are many projects needing operation, which should be operated in strict accordance with the feeding operating procedures. In order to ensure that the air volume and speed of the preheater system are relatively abundant, the operator should add the wind to the required amount of wind of the cooler in advance. In this case, in order not to make the kiln head generate positive pressure, the operator should increase the opening of the exhaust fan damper accordingly Kiln opening. Once the kiln begins to open the ventilation, this will keep the kiln head in a slight negative pressure and at the same time prevent the rotary kiln system from too high a degree of vacuum.
In addition, in order to make the coal powder realize the complete combustion, it is necessary to keep the appropriate flame shape and continue to retain and increase the appropriate fuel injection of the kiln head.

Flotation Plant : http://www.mine-crusher.com/flotation-cell.html

The Three Types of Wet Permanent Magnetic Separator

The mineral that the magnetic separator can sort includes magnetite, limonite, hematite, manganese, siderite, ilmenite, wolframite, manganese ore, manganese carbonate ore, metallurgical manganese ore, manganese oxide, iron sands, kaolin and rare earth mine etc. The magnetic separation process is operated in the magnetic field of magnetic separator, with the help of magnetic force and the mechanical force on the role of the ore particles to achieve sorting. The ore particles with different magnetism moves along a different trajectory, sorting two or more separate products.
Wet permanent magnetic drum magnetic separator is a kind of magnetic separator widely used in the iron ore processing plant, which is suitable for the sorting of minerals with strong magnetism. In accordance with the tank structure type, magnetic separator can be divided into co-current, counter-flow, semi-counter flow. The selected size of these three kinds of magnetic separator is as follows: co-current tank ≤ 6mm, countercurrent tank ≤ 1.5mm and semi countercurrent tank ≤ 0.5mm.　
The processing capacity of the concurrent magnetic separator is large, which can not only be used for the rougher flotation and selection of the ferromagnetic materials with coarser granularity, but also is suitable for the concatenated work. When the feeding of concurrent magnetic separator is large, the magnetic mineral grains tend to lose in the tailings. Therefore, the operators should strengthen the operations management and control of the lower level of the pulp.
Counter-current magnetic separator is suitable for the roughing and scavenging of the fine-grained strong magnetic minerals. The recovery rate is higher, but a lower concentrate grade. Coarse material is easy to deposit to plug sorting space, thus the countercurrent magnetic separator is not suitable for the handling of coarse materials.　
Semi-current magnetic separator can not only obtain the high-quality iron ore concentrate, but also get a good recovery rate; therefore, the semi-current magnetic separator has been widely used in the production practice. It is suitable for the roughing and selection of the mineral whose particle is less than 0.5 mm and it can be used in series and parallel of several machines to achieve multiple scavenging and selection.

Stone crusher : http://www.hxjqcrusher.com/crusher/Hammer-crusher.html
Grinding Rod Mill : http://www.ore-machine.com/wet-rod-mill.html

The Common Ways to Improve the Production Capacity

According to the noise of ball mill, the operator can adopt electric ear to control electromagnetic vibrating feeder or belt feeder and control the right amount of the grinding material in the mill and automatically adjust the material to be evenly added, making the materials amount always maintain the best condition to improve the outputof ball mills.
Strengthening the ventilation .
The ball mill has a certain wind speed so that the fine powder generated in the grinding process can be promptly flowed away by the airflow, which will reduce the buffering effect of the fine powder and improve the grinding efficiency. And the product quality will not be affected.
The ventilation speed in the ball mill will be different due to the different materials to be grinded. Generally, the ventilation speed is 0.3-1.0m / s.
When the ball mill is well-ventilated, the water vapor in the mill will be discharged in time so that the holes of the compartment plate will not be clogged and the adhesion phenomenon of the mill boday is also reduced, which can reduce the temperature inside the mill and is conducive to the operations and improve product quality.
The production of high strength grade cement should choose the low-speed, otherwise, selecting the bigger speed.
Water spray in the mill.
When grinding cement, it will produce a lot of heat, which is harmful for the quality of cement and grinding efficiency and affect the production.
Spraying water that has been atomized with high-pressure air into the mill can effectively take away the heat inside the mill, realizing the cooling of the ball mill.
Water is a surface-active substance, which is easy to make the agglomerates of particles achieve the disintegration.
The water spray is determined according to the temperature inside the mill. Generally, when the temperature is below 1000C, there is no need to spray water.
In addition, the amount of water spray should be decided according to the temperature of the grinding clinker, which maybe accounts for about 1% to 2% of the amount of the cement. The water sprayed into the mill should be completely evaporated without residual moisture.

Drum dryer : http://www.ore-machine.com/dryer.html

Large Noise And Poor Manufacturing Precision

Large noise. The problem of large noise is one of the general problems for the domestic vibrating screen. The noise is usually more than 96dB, which results in that the working environment of the workers is poor and they cannot hear the unusual sound of the device. According to the inspection, the major source of noise is the vibration of the side plates of the screen frame and bearing. Further, the friction between the supporting base and the transmission gear, sieve, the exciter housing and the damper spring will have a greater noise. Therefore, the noise control requires the use of integrated noise reduction in order to achieve better results. After testing, adding the rubber sheet on the side plate of the sieve box, the feed inlet and the discharge port can effectively suppress the vibration, reducing radiated noise; conducting damping treatment between the inner cover and outer cover can reduce the vibration of the bearing and reduce bearing noise; replacing the steel sieve into the polyurethane sieve with small elastic modulus and low impact noise.
Poor manufacturing precision. The manufacturing plays an important role in the form of the product. Usually, for the success of the product, the good design accounts for 7 percent and the manufacturing accounts for 3 percent. But for the vibrating screen, it has been proved that the manufacturing accounts for at least 5 percent according to the past experience. Among the reasons, the problem of manufacturing materials, manufacturing processes, production equipment is the main reasons that cause the gap between the domestic vibrating screen and the internationally renowned products. This problem can be detailed embodied in the following aspects: the overall geometry of the screen frame is irregular, many defects, rough machining, and welding deformation. This phenomenon is also related to the corporate management which is not in place.

Sand making machine : http://www.ore-machine.com/sand-maker.html
impact crusher for sale : http://www.ore-mills.com/impact-crusher.html

The Three Effects of the Flotation Machine

Mine flotation machine is the technology equipment that is used to select different kinds of ores, which includes metal, non-metallic, non-ferrous and ferrous metals. The main grading way of the flotation separator is based on the hydrophobicity of different minerals. But its beneficiation process must go through three stages and the three stages have different roles in the flotation process. The following is the brief introduction of the function of the three stages and their influence on the flotation process.
1. Good pneumatic role
As for the ore flotation machine, it must be guaranteed to suck sufficient air into the pulp to generate a large number of appropriate size bubbles. And these bubbles try to be dispersed in the entire tank, the finer the air dispersion is, the better it will be and the distribution of the bubbles will be more uniform, which will provide more and more opportunity for the mineral particles to contact with the air bubbles. The better process performance of this kind of flotation separator is, the higher the flotation efficiency will be. Therefore, the inflatable degree of the mine flotation machine is usually presented by the inflatable volume.
2. Stirring action
Guaranteeing the good stirring action of the ore flotation concentrator is helpful to ensure the ore particles will not precipitate but will be evenly distributed in the tank in suspension, which can make sure that the mineral particles and air bubbles can be in full contact and collision in the tank. At the same time, the stirring action can also promote some insoluble drug to be dissolved and dispersed to facilitate to play the full role of the pharmaceutical and mineral particles.
3. Circulation flow effect
The flotation machine has the function of regulating the pulp surface, the circulation amount of slurry and the inflated amount, which will increase the chance of contact between the mineral particles and bubbles, can maintain the stablity of the foam and has a certain thickness. It not only can remain the purposes mineral, but also can enable the mixed gangue fall off, resulting in a "secondary enrichment". It is capable of continuous operation and easy to adjust. And in the flotation process, it is sometimes necessary to adjust the thickness of the whole foam layer and the slurry flow rate. In the actual production process, from the feeding, the production of concentrate to the discharge of the tailings, all the steps are continuous process and are required the easy adjustment.

The Difference Between Rod Mill And Other Mills

Rod mill, as one of the mills, has its own uniqueness. Compared with the other ball mill equipment, what is the difference between rod grinding mill and them?
As for the rod mill, driven by the reducer and the surrounding large gear through the motor, the cylinder rotates. The cylinder is equipped with the appropriate grinding media - steel bars. Under the role of the centrifugal force and friction, the grinding media is elevated to a certain height is thrown down. The materials to be grinded are conveyed to the interior of the cylinder from the feeding port and then the materials are crushed by the movement of the grinding media. Finally, they will be discharged out of the machine by the force of overflow and continuous feeding to prepare for the next production process. The following is the brief introduction of the differences between rod grinding machine and other ball mill equipment.
1.The general ratio between the length and the diameter of the cylinder is 1.5-2.0 and the inner surface of the end cap should be vertical plane, whose purpose is to prevent the steel bars from and reduce the chaotic motion, bend and break in the cylinder body to ensure the regularity movement of the steel bars. The ratio of length to diameter of the ball mill is small, in most cases the ratio is only slightly greater than 1.
2.It adopts the overflow type and open type to discharge, but not the grid plate. The hollow journal diameter on the discharging end is greater than that of the specifications of ball mill. The operating speed of the cylinder should be lower than that of the ball mill of the same specifications to make the medium within it work in the falling state.
3.Using the steel bars with the diameter of 50-100mm as the ore grinding media, while the ball mill adopts steel balls as grinding media. The length of the steel bar which is made of high-carbon steel with carbon content of 0.8% -1% is shorter than the cylinder. The loading of the bars is approximately 35% -45% of the effective volume.

Flotation Concentrator : http://www.mine-crusher.com/flotation-cell.html

The Status Quo of Coal Vibrating Screen

Vibrating screens are a kind of important equipment to help to complete a variety of different industrial processes, which is widely used in coal, chemical industry, metallurgy, ports, water conservancy, electric power industry. In the coal preparation plant and screening plant of coal industry, the screening operations are mainly used in coal preparation and product processing. Vibrating screens have played an important role in the rational utilization of coal resources, protect the environment and create economic benefits for the coal enterprises. Just like some other mining machinery (vibrating feeder,dryer machine), the vibrating screen has a relatively long history. The history of the coal vibrating screen can be traced back to the 1960s, on the basis of absorbing foreign experience and independent innovation, vibrating screen, both in design technology, manufacturing processes, varieties and specifications, and in technical performance and structural strength, has been greatly improved, but there are some inadequacies.
According to the distance from the resonance frequency, the vibrating screen is divided into the the resonance screen and inertial vibrating screen. Currently, in the screening operation of coal industry, the inertial vibrating screen is widely used. Based on the characteristics of the work trajectory of the screen surface, the inertial vibrating screen is divided into circular vibrating screen and linear vibrating screen. Circular vibrating screen is mainly used for the pre-screening and final screening; linear vibrating screen is used for dehydration screening, desliming screening and sculping screening. Circular vibrating screen has more than 40 years of history in coal production, the initially eccentric and simple inertia style are the prim stypes.
Linear vibrating screen is developed on the basis of circular vibrating screen, which is also known as the dual-axis inertial vibrating screen. In the initial stage, driven by the single-motor, the gear is forced to rotate to make the double rollers do the relatively synchronous directional rotation to create the excitation force. In this case, the lubrication and sealing of the geal are easy to have problems, affecting its service life. Therefore, currently , the linear vibrating screen driven by dual-motor without forced drive is widely used.

Rock crushing plant : http://www.hxjqcrusher.com/crusher/Stone-crushing-plant.html

The Usage And Maintenance of Vibratory Feeder

Electromagnetic vibrating feeder is the kind of device with the integration of electromechanical, which can change, start and stop the material flow instantaneously. Therefore, the feeding amount has high accuracy. It applies to convey the bulk, granular and powdered materials to the feeding device from the feed bin or hopper evenly and quantitatively.
The vibrating feeder is comprised of the trough, shock absorber, electromagnetic vibrators and electrical control box, in which the electromagnetic vibrator is the core component of the machine, whose performance determines the performance of the vibratory feeder.
Compared with other feeding equipment, it has the following characteristics:
The control systems generally use SCR half wave rectifier circuit so that it is easy to adjust the feeding amount by adjusting the thyristor open angle easily in the process. What is more, it can also realize centralized control and automatic control of the production process. The following are also its advantages：small size, light weight, simple structure, easy to install, no lubrication, low operating costs. Because that the materials in the trough are continuously tossed in the feeding process and moves forward according to the parabolic trajectory. Therefore, the wear of the trough is small.
Among the components of the vibrating grizzly feeder, the electromagnetic vibrator is designed by the application of the theory of electromagnetic drive and mechanical resonance. It is composed of the elastic system which is forced to vibrate by one pair of particles. According to the mechanical vibration resonance principle, to create high mechanical transmission capacity with small power consumption. Its main parameters include frequency, amplitude and drive angles and these parameters have different optimum values for different materials.
As for the maintenance of the vibrating feeder during the operation, the operators must always check the amplitude of the trough and coil current. If the plate spring and the puller bolts are loose or the plate spring breaks, the air gap between the iron core and the armature will change and it should be dealt with immediately. When the vibratory feeder starts to run, it is necessary to increase the times of checking. Paying special attention to the sound of the machine, if the voice suddenly become larger, the operators should analyze the reasons carefully. The sealing cover of the vibrator must be normal to prevent the gap between the plate spring from being clogged.

The Brief Introduction of Classification of Vibrating Feeder

According to the structure and purpose, vibrating feeder can be divided into three types: vibrating feeder GZD type, Vibrating Feeder ZSW type, vibrating feeder GZZ type.
Vibrating feeder GZD type:
Its working principle:
GZD type vibrating feeder is mainly composed of vibrating frame, vibration motor, spring, bearing seat and wear-resistant liner.
The start up of the vibrating motor force the rack to vibrate on the support spring. Treating the vibration as the driving force, the materials can slide or do the throwing motion on the chute, which causes the material to move forward and achieve the purpose of feeding.
Vibrating Feeder ZSW type:
Its working principle:
ZSW type vibrating feeder is mainly composed of vibrating frame, spring, vibrator, motor vibrating frame and motor etc. The mesh between the gears comprises the eccentric shaft so that the two gears must mesh with each other when assembling them. Driven by a motor, the two eccentric shafts will rotate to generate a great synthetic linear exciting force, making the body of the vibrating feeder do forced vibration on the support spring. The ZSW type vibrating feeder regards the vibration as the driving force to make the materials slide or do the throwing motion on the chute, which causes the material to move forward and achieve the purpose of feeding. When the materials pass through the screen bars among the cell body, the finer materials can fall through the gap of the sieve, realizing the sieving effect without undergoing the next crushing process.
Vibrating feeder the GZZ type:
Its working principle:
The GZZ series of product configuration priors to the primary jaw crusher. When transporting the big block of material continuously and evenly, it, at the same time, can remove the dirt, impurities and control the feeding amount to match the processing capabilities of the following crushing process and screening production line. They are the indispensable equipment in the complete production line, having the characteristics of solid structure, impact resistance and wear resistance.

Ore flotation equipment : http://www.crusher-export.com/flotation_cell.htm
Rotary kiln : http://www.best-crushers.com/rotarykiln.htm 

The Moisture Influences The Screening Process

The moisture of the materials includes external moisture and inherent moisture and the inherent moisture does not have much impact on the screening process. For example, when screening some bituminous coal, the screening process would be difficult to continue after its moisture is up to 10%; while as for the lignite, even its inherent moisture reaches to 40%, the screening process can be conducted as usual. If the external moisture in the material increases to a certain extent, the viscosity will increase and it is easy to plug the sieve, which will also make fine-grained particles bond into block and adhere to the large particles. This phenomenon will affect the material stratification, resulting in the screening efficiency decrease significantly.
When screening the same materials including the same moisture content with the screening equipment (vibrating screen) that has different meshes, the influence to the screening efficiency caused by the moisture is different. The larger the size of the mesh is, the smaller the possibility that the mesh is blocked is. The impact of moisture is smaller. Moreover, since the distribution of moisture in the various fractions is uneven, the finer particle size will greatly reduce the moisture of the oversize materials, which will not affect the smooth conduct of the screening process. Therefore, when higher moisture severely affect the screening process, a better way that can be considered is to increase the mesh to improve screening efficiency.
If the materials to be screened contains the clay, even in the case of low moisture, it may also be difficult for the screening process. Because such kind of materials are not only easy to agglomerate, but also easy to block the sieve, which is difficult to clean, lowering screening efficiency, even the resulting that the screening process can not be carried out. When screening the materials with higher clay content, in order to prevent the sieve from being clogged, the optional electric sieve or strings sieve would be a good choice.

stone jaw crusher : http://www.hxjq-crushers.com/1.htm
Ball mills : http://www.crusher-export.com/ball_mill.htm 

The Brief Introduction of Coarse Aggregate And Fine Aggregate

The aggregate, whose particle size is greater than 4.75mm after crusher processing (jaw breaker) is known as coarse aggregate, commonly called stones. Macadam and pebble are the frequently used ones. The gravel is made of natural rock or rock by crushing and screening, a kind of rock particles whose diameter is greater than 4.75mm. Pebbles are produced by natural weathering and water handling, a kind of rock particles whose diameter is greater than 4.75mm. The pebbles and gravel particles, whose length is 2.4 times greater than the average particle diameter belong to the needle-shaped particles; whose thickness is 0.4 times less than the average particle diameter belong to tabular grains (average particle diameter refers to the average particle diameter fractions of the upper and the lower limit). Construction pebbles and gravel should meet the technical requirements of national standards GB / T 14685-2001. The choice of materials is wide and the finished products of the general ore can meet the needs after being processed by the corresponding processing equipment (rock crusher), supplying the materials for construction.
After the primary crushing and the crushing and shaping of sand making machine, the aggregate, whose particle size is less than 4.75mm, known as fine aggregate, commonly named sand. According to the production source, the sand is divided into two categories: natural sand and artificial sand. Natural sand is made by natural weathering, water handling, sorting and stacking, whose particle size is less than 4.75mm. The sand does not include the particles of soft rock and decayed rock. Natural sand includes river sand, lake sand and mountain sand and desalinated sea sand and the artificial sand the joint name of manufactured sand and mixed sand.
As for the aggregate investment, the demand side and the projects that will use the finished aggregate is the first problem. Aggregate is primarily used to provide granulous loose material to form the skeleton and fill for the concrete and building aggregate. It is divided into coarse aggregate and fine aggregate. Coarse aggregate includes pebbles, gravel and slag and fine aggregate includes the fine sand and coal ash.

jaw breakers : http://www.ore-mills.com/jaw-crusher.html
Rotary kiln : http://www.mine-crusher.com/rotarykiln.htm

How to Comply With The Trend of The Times

Mining machinery industry is the industry, which is an integration of technology, capital and labor. In recent years, with the development of the mining machinery industry in China, the growing market size and increasing efforts to strengthen infrastructure, new higher requirements of mining machinery have been put forward, which not only include the technology and intelligentize, but also consist of energy conservation, consumption reduction and environmental protection. The the traditional mining machinery such as crusher, sand maker can not meet the requirements of the air quality at this stage. The only way to realize long-term sustainable development is technical upgrading and innovation.
1. Improving the technical level. The crusher industry should combine self-development with the introduction and absorption of advanced technology. Compared with the developed countries, the mining machinery (crusher) industry in our country is very immature in terms of technology and equipment performance. High energy consumption and high pollution produced in the backward development way has caused great pressure on the environment. Under the new situation of economic globalization, the mining machinery industry as should also "open horizons", introduce foreign advanced production technology and experience, research and develop high-quality and environmental friendly mining machinery as well as adhere to the independent development and grasp the innovation initiative in their own hands to achieve a new leap of the mining machinery industry in China. The cone crusher produced by Hongxing Heavy Industries has been widely used.
2. Training high-quality personnel. Learned from the current findings, the extreme shortage of human resources in the mining machinery industry in China is a big problem. A lot of the production staff had not received the training of professional theory, just simply try to operate in accordance with the traditional experience, which is an important reason for the backward development of China's mining machinery industry. Judging from the current situation, in order to achieve new development, mining machinery industry should focus on the training of professionals to achieve the integration of knowledge and production.
3. Enhancing the overall level of the industry in terms of internal communication and cooperation. In the highly competitive environment, varying degrees of mutual confidentiality and mutual blockade is beyond reproach, which is necessarily reflect a kind of self-development enterprises. But this phenomenon constrain the enhancement of technical level of the industry as a whole. Therefore, for the development of the industry as a whole, the mining machinery enterprises with higher level should help and drive the enterprises of technological backwardness to achieve the revitalization of the mining machinery industry in China.
In the low-carbon economy, the mining machinery should continue to adopt the new technology to conduct independent innovation, train high-quality personnel, adjust the structure, optimize the industrial chain, realizing sustainable development of the low-carbon economy.

Classifiers : http://www.crusher-export.com/classifier.htm
Impact crusher : http://www.mine-crusher.com/

The Large Market Potential of Belt Conveyor

With the implementation of policies of energy-saving and emission reduction, the small-scale thermal power plants, mines and cement enterprises have been closed in succession and the large enterprises with advanced technology spring up, which requires a higher demand of the belt conveyor in the aspects of performance, quality, safety and reliability and so on. The belt conveyor heads towards the direction of long-distance, high-power and large capacity. The belt conveyor is in a high-speed development stage, the market demand for the belt conveyor is huge.
The belt conveyor develops rapidly. It has gradually begun to replace the locomotive and car transport in some areas. Compared to the foreign countries, the belt conveyor industry in China started late. However, driven by the development of the basic industries of metallurgy, mining, coal, the belt conveyor achieves rapid development. As our country conducted industrial structure adjustment and implemented the policy of energy-saving and emission reduction, the enterprise began to increase the efforts in technology research and development, hydraulic automatic tensioning technology, turning technology, flexible brake technology, tape anti-deviation technology, monitoring technology, and converter technology and other related technologies have been gradually applied to the belt conveyor, which improves the safety and reliability of belt conveyor greatly. Meanwhile, the key technologies such as multi-turn, upwards transportation and downwards transportation have got better solution.
It is reported that the belt conveyor developed independently by our country already has the ability to equip domestic major projects, and has begun to enter the overseas market.
From the perspective of the future prospects of the domestic market, the scale of investments in the sectors of coal, mining, port will continue to expand, which will also promote the increasing market demand for belt conveyor. With regard to the international market, a number of developing countries are making great efforts to develop their own basic industries, such as India, Brazil, Southeast Asia, Africa, Latin America and other countries. In these regions, the demand for the belt conveyor is also increasing.

Rock crushing plant : http://www.crusher-export.com/rock-line.html
cone crusher : http://www.hxjq-crushers.com/27.htm 

The Achievements Made by Sand Industry

As an important part of the national economic construction, sand and gravel industry is irreplaceable. The architecture, infrastructure and transport construction cannot be separated from the sand and gravel. In the past decades, the sand and gravel industry has made the following four major achievements.
1. Having promoted the rapid development of the national economy. Since the reform and opening up, China's economic development regard the investment-led and infrastructure as the theme, urbanization and industrialization as the carrier. Under the economic structure, the national economy developed rapidly. Currently, the sand and gravel industry has formed a market size of 300 billion Yuan, directly or indirectly, stimulating the development of related industries. The development of sand and gravel industry promoted the rapid growth of GDP directly, having created a lot of jobs for the community and making outstanding contributions to the development of the national economy.
2. The development and exploitation of artificial sand. With the increase in demand, China has become the largest sand consumption country. In the case of the shortage of resources, the development and exploitation of artificial sand meet the high demand for the construction. Currently, the production proportion of the artificial sand has reached 50% in the sand and gravel industry. The development of artificial sand not only makes up for the lack of natural sand , but also opens up new way of resource conservation and environmental protection. To achieve this target, the relevant mining equipment (sand maker, sand washer etc) has played an important role.
3. The policies and standards have been improved increasingly. With the support of the relevant government departments, the sand and gravel industry developed rapidly in the policy-oriented, standards-making and quality improvement, leading the sand and gravel industry gradually to be standardized, industrial.
4. Some backbone enterprises emerged and played a leading role. In the decades of industrialization wave, a number of backbone enterprises grows rapidly such as Henan Hongxing Ming Machinery Co.,Ltd, which has made great enhancement in management level and mining quality and has made great progress in strengthening environmental protection and production safety.

The Factors That Influence the Selection of Magnetic Separator

Dry magnetic separator is not only applicable to the magnetic separation of the ores whose particle size is less than 3mm such as magnetite, pyrrhotite, roasted ore, ilmenite, but also can be used for iron removal work of coal, non-metallic minerals and building materials. Hongxing Mining Machinery Company specializes in the production of magnetic separator, which is featured with deep magnetic field strength, large wrap angle of the magnetic system, stable magnetic field strength and reliable transmission system. It can significantly increase the grade of the ore to be into the mill. The factors that influence the selection of the magnetic separator as follows.
(1) The thickness of the feeding layer. It is related with particle size and the content of magnetic particle of the raw materials being processed. When processing the coarse particles, its feeding layer is thicker than that of the fine particles. When processing the coarse fraction of the ore, the feeding layer of the ore is about 1.5 times thicker than that of the largest particle, while 4 times for the maximum particle and 10 times for the fine material. When the magnetic material content of the raw materials is not high, the feeding layer should be thinner. If too thick, the magnetic particles in the lowermost are subjected to the pressure of the upper material and they cannot be raised by the magnetic force, decreasing the recovery. If the content of magnetic particles is high, the feeding layer can be thicker.
(2) The magnetic field strength and the working gap. It has a close relationship with the granularity of the material to be processed, magnetic level and operational requirements. When the working gap is fixed, the magnetic field strength is determined by the ampere-turns of the coil that cannot be adjusted. The magnetic field strength can only be adjusted by changing the excitation current. To deal with the ores with strong magnetism, the weak magnetic field should be chosen, and vice versa. When the current is constant, the change of the working gap can not only change the strength of the magnetic field, but also can change the magnetic field gradient. When handpicking, it is better to enlarge the working gap to increase the selectivity and improve quality, but at the same time, it is necessary to increase the magnetizing current to guarantee the magnetic field strength.

The Detailed Analysis of Some Problems About Vibrating Screen

The first fault phenomenon: the vibrating screen cannot be started or amplitude is small.
Reasons:
1) Motor is damaged; 2) the electrical components in the control circuit get damaged; 3) under voltage; 4) the materials are piled too much on the screen surface; 5) there is something wrong with the vibrators; 6) the grease in the vibrator thickens into caking.
Remedies:
1) Replacing the motor; 2) taking replacement of electrical components; 3) Changing the power supply; 4) cleaning screen surface; 5) overhauling vibrator; 6) Cleaning vibrator and updating and putting the appropriate grease into the vibrator.
The second fault phenomenon: the motion of the material flow is abnormal.
Reasons:
1) The lateral level of straining box is not positive; 2) the stiffness of the support spring is too large or the spring is damaged; 3) the screen surface is damaged; 4) the feeding is extremely uneven.
Remedies:
1) Adjusting the height of the stand; 2) adjusting or replacing the spring; 3) checking the screen surface and replacing a piece of new screen surface if there is a need; 4) ensuring uniform operation and stable feeding.
The third fault phenomenon: the quality of vibration screening is not good enough.
Reasons:
1) Sieve pit is clogged; 2) the moisture of the material that is into the sieve is too large; 3) the feeding is uneven; 4) the materials on the screen surface is too thick; 5) the screen is not pulled tightly and the drive belt is too loose.
Remedies:
1) Reducing the load of the machine and cleaning the screen surface; 2) changing the angle of the screen box; 3) making adjustment of the feeding; 4) lessening the feeding; 5) pulling the screen and drive belt tightly.
The fourth fault phenomenon: the rotation of the machine slow down and calorification when the vibrating screen is working normally.
Reasons:
1) The lack of lubrication in the bearing; 2) bearing obstruction occurs; 3) putting excessive lubricants into the bearing or the inappropriate oil is added; 4) the bearing is damaged or the poor installation. The eccentric block of the round wheel falls off so that the labyrinth seal get jammed.
Remedies:
1) Adding the lubricant to the bearing; 2) cleaning bearings, replacing the seals and checking the labyrinth seal device; 3) checking the lubricants of the bearing; 4) replacing the bearings, installing eccentric blocks and adjusting the round wheel.

The Issues Needs Noticing When Maintaining Impact Crusher

With the rapid development of the national and regional economy, the demand for the building materials is increasingly stronger. The crushing equipment that are used for sand and gravel processing becomes popular. Among the stone crushers,due to its high efficiency and high throughput in the secondary crushing, impact crusher is favored by the customers.
Impact crushers are generally able to handle the large solid particles whose diameter is less than 50cm. Its compressive strength is relatively large and the broken performance is quite high. After being broken, the solid particles will be shown with the appearance of little cube. Here, we will briefly introduce some issues needs noticing when conducting regualr maintenance of impact crusher.
First of all, it is necessary to leave sufficient maintenance space for later maintenance engineers to perform periodic maintenance when installing the impact crusher. Secondly, the impact crusher has been carried out the equilibrium processing in the factory before being used. There is no need for the users to do balance test again. After a period of time, if the spare parts of impact crusher get worn, the users generally only need to replace the blade, hammerhead and the relevant bearings on it. After the replacement, the machine can not be restarted until the balance of the machine is adjusted. The main wheel and the driven wheel should be in the same plane and the users should adjust the transmission belt properly to avoid making it too tight or too loose. The motor should be fixed. Last, the most important thing is that the users must pay attention to the various parts of the impact crusher, checking whether their positions appear excursion and deformation or not. Tightening each screw, checking the sealing and the reliability of the hydraulic system to ensure no dripping.

How to Solve the Dust Problem in the Production Process

1. Changing the bag filters at the corner of crusher and belt into LNGM64-4 type and LNGM4-8-type. Filter material that is water repellent and grease proofing is adopted according to the characteristics of the dust. LNGM4-8 type baghouse adopt open-air layout and its shell is conducted heat preservation and waterproof protection. To ensure reliable operation of equipment, when purchasing the parts, the users should pay attention to the brand and specifications of the key supporting parts of baghouse in order to reduce the failure rate of the device.
2. Improving the process layout of baghouse and fix up the dust remover of crusher dust according to the direction of the belt conveyor. Transforming the standard ash hopper into dual ash bucket so that baghouse can be raised to be conducive to the arrangement of the intake duct (the angle of the wind pipe). Installing the wind box in the air inlet so that the dust of the crusher feed opening can directly enter the wind box, which is helpful to save elbow and reduce the resistance of the system, improving the dust collection efficiency.
3. Strengthening the management of dust removal equipment and regularly inspecting the dust cover. Timely solving the problems when finding them. As for the dust emission of the baghouse in the working environment, implementing management by objective assessment and conducting dust monitoring on a regular basis. To mobilize the work enthusiasm of the staff with the use of economic leverage to improve the maintenance level of dust removal equipment, minimizing the dust pollution.
In order to guarantee the good working environment, in addition to strengthen the maintenance of dedusting equipment, keeping post and crushing equipment clean is also very necessary.