Ways to Reduce the Beneficiation Loss of Magnetite

For the magnetite ore dressing, the advanced ore beneficiation process can not only help us to save energy and reduce the beneficiation loss rate, but also can fast recover the processing costs. The advanced beneficiation process has played a very important role for improving the economic benefit. In the following paragraphs, the experts of Henan Hongxing Mining Machinery will carefully analyze the ways to effectively reduce the beneficiation loss for the magnetite from various links.
First, in terms of the improvement for the working effect of the sculping screen, we can use the sculping screen with high efficiency and the mesh with large aperture ratio. We can set a fixed screen or asieve bend before the sculping screen. The density of the underflow of the heavy medium cyclone is too high and the sculping effect is poor. Part of qualified suspension of the clean coal under the screen can be introduced to dilute the bottom currents and improve the sculping effect. The water spray for the products sculping sieve should be enough. The clean water can use the pressure water jet, while the recycled water can use the non-pressure water jet.
Second, the direct magnetic separation process with dilute media can be used. The practice of the coal preparation plant has proved with the direct magnetic separation process with dilute media can make the consumption of the media significantly reduce.
Third, the recovery rate of the magnetic separator should be ensured. Generally, the recovery rate of the magnetic separator should be ensured more than 99.8%. Large amount of the dilute media is recovered through the magnetic separator. The working efficiency of the magnetic separator has great impact on the loss of the magnetite. For example, if the amount of the magnetite ore into the magnetic separator is 6000kg/h and the recovery rate of the magnetic separator is 99.9%, the loss of the magnetite ore is 6kg/h. If the recovering rate of the magnetic separator is 99%, the loss of the magnetite ore is 60kg/h.
Forth, the liquid level of the machine should be keep balance to avoid the clogging phenomenon.

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Solution for Breakage of Spindle and Bush of Cone Crusher

The cone crusher is favored by a lot of mining enterprises because it has a lot of advantages. However, the economy in this year is not booming, so the mining machinery industry suffered a landslide. With the economic policy, the domestic economy begins to recovery with stability. Especially some of the large projects promote the development of the cone crusher. In this article, the experts of Henan Hongxing Mining Machinery will mainly analyze the solutions for breakage of the spindle and bush of the cone crusher.
When the cone crusher works normally, the crushing cone does the regular movement. The center line of the crushing cone and the eccentric sleeve are not on the rotating centerline. Therefore, in the operation process, the inertia force and the inertia moment of force for the fixed suspension point is bound to be produced. They are acting on the rack of the cone crusher. Although balanced measures have been taken for the cone crusher, the errors in terms of the manufacturing and installation may lead to the frequent contact between the lower end of the spindle of the crusher and the eccentric sleeve, which may cause breakage of the spindle. The lower end of the cone bushing may be broken. The breakage of the spindle may have a great impact on the service life of the crusher.
The experts have put forward the following ways to avoid the breakage of the spindle. On the belt conveyor before the cone crusher, install a metal detector and the suspension magnets to remove the metal objects in the ores to prevent the metal objects from falling into the crushing cavity. During the installation process, the heating temperature of the cone body and the cooling speed after the assembly should be controlled strictly to improve the strength of the spindle and reduce the concentration of the stress. Before the assembly, you should carefully check the hole and the spindle to prevent the unnecessary inner stress. The structure of the spindle should also be improved.
In terms of the cone sleeve, you should make the two thirds of the contact area of the sphere bearing on the outer ring when the sphere bearing is replaced.
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Common Notes for Commissioning of Cone Crusher

If there is something wrong with the cone crusher equipment in the actual operation process or the cone crusher machine needs normal maintenance, the operation for the machine need to be stopped to check and maintain the related machine. After the check for the cone crusher, the cone crusher can not be put into use immediately. The commissioning for the cone crusher is very necessary to ensure the success of the check and maintenance for the cone crusher to reduce the inappropriate faults of the machine. In this article, the experts of Henan Hongxing Mining Machinery will carefully analyze the common notes for the commissioning of the cone crusher.
The commissioning of cone crusher with empty load has the following requirements.
First, start or stop the machine according to the starting program. The respective interlock system shall comply with the technical requirements.
Second, the moving cone should rotate forward or reversely. 15 revolutions per minute should not be exceeded.
Third, there should be no impact or periodic noise for the gear of the cone.
Forth, the lubrication system should work normally. The oil pressure should be within the range of 0.5kg/cm2 to 1.5kg/cm2. The temperature of the return oil should not be more than 50℃. For the commissioning with load for the cone crusher, the temperature should not exceed 60℃.
Fifth, the running time for the normal operation should not be less than 2 hours. Generally, the time should achieve the indentifying requirements.
Sixth, the hydraulic adjustment device of the hydraulic device should be locked according to the operation program. Adjust the using requirements of the discharging port.
The commissioning with load for the cone crusher has the following requirements.
First, check the load for the commissioning with load for the cone crusher.
Second, during the load-commissioning for the cone crusher, make the cone crusher run continuously. The feeding amount should increase gradually.
Third, the installation for the feeding device should be correct. The ore should be distributed into the crushing cavity evenly.
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Technology Innovation of Crusher Promotes Development

Today, with the booming and growing momentum of development in western China, the mining machinery is ushering a new time with challenge and opportunity. The mining machinery produced by Henan Hongxing Mining Machinery is the equipment with very high technological content and high integration. The crusher machine belongs to the large-scale mechanical beneficiation equipment. This kind of equipment has very high requirements on the quality. The quality of the mining machinery is related to the construction of the entire project. When the project builders or investors choose the crusher machine, the inspection of the quality of the products is very important and necessary. Only the qualified products can be put into the production. You can not just consider the price factor.
The mining machinery manufacturing industry should continue to integrate into the human outstanding achievements in various fields. Faced with the major demand for national economic construction, the mining machinery enterprises should achieve the sustainable development with the guidance of the scientific concept of development. The development and research of the new products continuously integrate with the achievements of human in various fields. With the advance of the materials science, manufacturing industry, information technology and the advancement in computer technology, every new round of the product has new injection of the technology. The replacement cycle of the spare parts become shorter and shorter. The updating of the new equipments becomes faster and faster. There is no mature experience to be learned for the development and research of the large-scale mining machinery. Therefore, we require the help of a multi-disciplinary technical integration to improve the design efficiency and quality, and enhance the capability of independent innovation and market competitiveness.
The gravel materials needed in the construction of high-speed rail need the mining machinery, which needs the majority of companies to do a good job for the self construction and development to produce the products and equipment which can meet the requirements and try to find a better market. The mining machinery enterprises should grasp the opportunities of the domestic market. In addition, they should greatly develop the foreign market.
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Railway Infrastructure Promotes Development of Machinery

Recently, China's railway construction scale is also growing. It is reported that the railway infrastructure investment was 69.77 billion yuan in October this year, which has increased of 240.8% compared with 20.47 billion yuan in the same period last year. The sequential growth is 8.5%.During the second fifth year, the scale of the commissioning of the new line has reached 30,000 kilometers and the total mileage of the national railway operation is also extended to 120,000 km. The railway construction situation is very is excellent, which will strongly impetus the development of the transportation, crusher machine, sand making industry and other industries.
Since the high-speed railway construction belongs to the areas of high-rise buildings in China, the requirements on the quality of the sand and gravel aggregates are very stringent. In addition, the market opportunities brought about by the construction of high-speed rail will propose new requirements for the production and performance of the crusher machine and other stone processing equipments. The quality of the crusher will directly affect the quality of the sand and gravel aggregates. As the raw material for cement, concrete and other building materials, the sand and gravel aggregate will have an important impact on the quality and the service of the railway. The mining machinery industry will also subject to a new round of challenges and elimination in the acceleration process of the railway construction.
As a result, the domestic advanced mining machinery enterprise Henan Hongxing Mining Machinery actively introduces the international advanced production technology and combines with the independent research and development to enhance the performance and production of the crusher equipment. The new type of crusher machine and sand making machine researched and developed by Henan Hongxing Mining Machinery are warmly respected in the cement, construction, building materials and other fields. In addition, the production line configured by Henan Hongxing Mining Machinery has also become the new darling of the high-speed railway construction.
According to relevant sources, the scale of investment in fixed assets of the railway in 2013 is expected to reach 6500 to 7000 million yuan, which increases of 5% to 10% compared with that in 2012. These positive signals heralded that the railway construction in China is gradually warming up. The mining machinery industry should seize the opportunity to increase the of sand production technology and equipment innovation and strengthen exchanges and cooperation with the international advanced enterprises.
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Four Hypotheses for Structure Optimization of Ball Mill

For the grinding efficiency of the ball mill">ball mill and the simulation and optimization for the representation model between the parameters of the mechanism o f the milling machine, the simplified three-dimensional modeling of the mechanism of the milling machine is mainly composed by the large pulley, bearings, connecting rods, rocker and the tray. The grinding tube is fixed on the tray. The eccentric distance between the bearing and the pulley is 60mm. The initial length of the link is 180mm and the initial length of the rocking bar is 120mm. The length of the hinged four-bar mechanism frame is 200mm.
The motor drives the pulley and drives the rotation of the pallet. The action of the hinged four-bar mechanism frame causes the additional swing of the tray. Therefore, the grinding cylinder on the tray does the planetary motion with the tray. The eccentric force produced by the rotation of the rolling cylinder and the friction force between the rolling cylinder and the cylinder wall causes the inter impact and friction between the milling ball and the materials in the cylinder so that the materials can be crushed.
In order to simplify the analysis process, the experts of Henan Hongxing Mining Machinery have put forward four hypotheses for the structural optimization for the ball mill.
First, the milling body is in the mill barrel and it does the circular motion according to the location layer by layer.
Second, it is the projectile motion after the milling body break away from the cylinder wall.
Third, the sliding between the milling body and the cylinder wall is very small, which can be negligible in the calculation process.
Forth, the impact of the materials in the cylinder body on the motion of the milling body can be negligible.
Most of the grinding impact of the ball mill on the materials is derived from the impact energy of the milling body. However, the grinding rate and the impact energy of the ball mill show the line relationship with any standard and size. In addition, the slope of the line is the grinding rate of the materials.
Original link: http://www.crusher-export.com/grinder/n147.htm
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Magnetic System Model for Separator Magnetic Separator

The magnetic system physical model of the experimental prototype of new generation of the large particles magnetic separator produced by Henan Hongxing Mining Machinery is composed of the yoke and permanent magnet. The model ignores the effect of axial edge effect of the magnetic system and it is simplified to the ZD model. There are friction wheel devices at the external part of the drive. Since the leakage of the electric flux density of the magnetic system at the external part of the magnetic roll is small, the yoke section of the magnetic system has been simplified. In the physical model of the magnetic system, the impact of the magnetic ore powder in the cylinder on the magnetic field has not been considered. The magnetic reel is made of the high permeability soft magnetic materials. The permanent magnet is made of the high-performance rare earth permanent magnet material. The demagnetizing curve of the rare earth permanent magnet almost has the linear feature. In addition, the slope of the demagnetizing curve is almost equal to the permeability of the vacuum magnetic one. In the analysis process, the demagnetizing curve of the materials can be linear processed. In the following part, the experts of Henan Hongxing Mining Machinery will introduce the establishment process of the magnetic system model for the large particle magnetic separator.
The first is the selection for the calculation of the type and the coordinate system. This permanent magnet system has symmetry which can simplify the three-dimensional problem to the problem of two-dimensional plane. This system contains the yoke, permanent magnets and the air gap, which belongs to the static magnetic field. Mganeotsattci Solver is used for the coordinate system.
The second is modeling. Since the external friction wheel of the yoke is simplified, there is no this structure in the modeling process. 
The third is the property of the specified materials. The permanent magnet is made of the high-performance seven permanent magnetic materials. Since the magnetizing direction and other parameters are calculated, the parameters of the permanent magnet can be determined.
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