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Magnetic agglomeration re-selection machine (referred to as magnetic gathering machine) and composite scintillation magnetic field selection machine (electromagnetic machine)
The structure of the machine is shown in Figure 1. It is somewhat similar to a magnetic dewatering tank, which uses a concentric cylindrical permanent magnet system to produce a uniform weak magnetic field. After the slurry is fed into the magnetic gathering machine, the magnetic ore particles rapidly form a magnetic floc or a magnetic chain under the action of a magnetic field and settle, and when it descends through several layers of different magnetic fields, it is repeatedly agglomerated and dispersed to make it trapped in the floc. The gangue and the lean body are separated and discharged from the overflow with the rising water flow, and the magnetic floc finally settles under the action of gravity. The difference between it and the magnetic dewatering tank is that the magnetic ore particles are only magnetized from the magnetic force, and the magnetized flocs are separated from the non-magnetic ore particles by gravity sedimentation.
There are five kinds of specifications for magnetic condenser: Φ300, Φ600, Φ1500, Φ1800, Φ2500. The machine is mainly used for treatment of certain magnetic iron ore mine (such as Dashi Shougang iron ore mine and processing plant for use in manufacturing in the 1980s), the undersize product from a magnetic separation process in a fine sieve The fine-grained lean organisms are removed to increase the magnetic concentrate grade. Wuhan Iron and Steel Chengchao iron ore processing plant has also successfully developed a similar magnetic poly machine and used for industrial production.
In recent years, the magnetic concentrator has been developed and promoted, and the variable diameter type has been developed from the common type. It has been applied in dozens of factories across the country and has achieved good results.
Magnetic agglomeration gravity concentrators have their drawbacks both in terms of variable diameter and non-reducing diameter. First, the internal magnetic field of the device is a permanent magnetic field. After the fabrication is completed, the magnetic field strength is fixed. When the external conditions such as ore properties and ore content change, the magnetic field strength cannot be adjusted in time, and the adaptability is poor. Second, the permanent magnet magnetic agglomeration gravity concentrator consumes a large amount of water, which will restrict the promotion and application in water-deficient areas. Therefore, it is imperative to develop new high-efficiency sorting equipment by using new technologies and new processes. In China, the “reverse flotation†process of magnetite is becoming more mature. The process itself is based on the fine grinding, adding anti-flotation operation to the magnetic separation concentrate, eliminating the lean continuous body in the concentrate, and achieving the purpose of lifting iron and reducing silicon. Due to the complexity of the process, the grinding grain size and the slurry temperature are relatively high, which not only has strict requirements on the grinding grain size, but also increases the consumption of chemicals and power. Therefore, the cost of beneficiation increases, reducing production efficiency. And because the use of chemicals may cause environmental pollution, it also requires environmental protection costs. The processing process of the Dashihe Mining Plant Dashihe Concentrator and the Water Plant Concentrator has been controlled by a fine-sieving-magnetic agglomeration process, and the sieve is returned to re-grind. However, due to the defects of the magnetic agglomeration gravity concentrator equipment itself, the technical requirements of the machine for further “lifting iron and reducing silicon†are limited, and the equipment is large in size, occupying a large plant area and consumes a large amount of water. At the same time, the operation adjustment of the device is relatively complicated, and it is necessary to configure a skilled operator, otherwise the fluctuation of the selection index will be caused. In recent years, once the ore properties are changed in the application, the sorting effect of the magnetic agglomeration gravity concentrator is not ideal. The reason for the analysis is mainly the magnetic field strength fixed by the magnetic agglomeration gravity concentrator, which cannot change with the change of the ore property, thus affecting the selection index.
In recent years, domestic research on electromagnetic gathering machines has become more and more in-depth, and the technology has become more and more mature. The alternating current magnetic field is generated by the energized coil to replace the invariable magnetic field, and good indicators are obtained. However, most of them only stay in the adjustment of several fixed current parameters, and they need to be switched to work, and automatic adjustment and control cannot be realized. Shougang Mining Company's self-researched compound scintillation selection machine (electromagnetic machine) uses the relatively mature single-chip linear control technology to cooperate with PID technology to produce a linear magnetic field that can be independently operated, automatically adjusted, and automatically changed with ore properties. Sorting equipment. It has achieved good results in the application of Shougang Mining Company's water plant concentrator and Dashihe plant.
The principle of composite electromagnetic field sorting: In view of the insurmountable shortcomings of the magnetic polymer machine, after careful research, the electromagnetic field is used to replace the ring-shaped permanent magnetic field in the original magnetic polymer machine. Because the electromagnetic field has a great advantage: when it is required to generate a magnetic field, the electromagnetic coil is energized, and when the magnetic field is not present, the coil is powered off, so that the presence or absence of the magnetic field can be easily controlled. This is not possible with permanent magnets. It is further enlightened by the working principle of the three-phase asynchronous motor. If the three coils of the three-phase asynchronous motor are placed at different positions on the straight line, then the three coils are connected to the current with a certain time difference (phase difference). When the rotating magnetic field is unfolded, the rotating magnetic field can become a linear moving magnetic field. If the three coils are placed inside the magnetic gathering machine and the direction of the linear moving magnetic field is downward, the ring magnet can be simulated to move from top to bottom. Track. During the movement of the magnetic field, the magnetic particles containing magnetic iron in the slurry of the magnetic concentrator can be moved downwards with the action of the magnetic field until a qualified concentrate is formed through the discharge port; and the magnetic property is weak and tasteful. The low part is gradually moved up by the floating force of the bottom rising water flow, and flows out through the upper overflow weir to become the tailings.
Structural design of composite scintillation magnetic field selection machine: According to the above design ideas, the basic design of selected cylinder diameter, length, electromagnetic coil diameter, winding parameters, electrical control circuit and automatic control has been further studied and researched. A wet high-efficiency selection equipment based on the combination of magnetic force, gravity and hydraulic force - Φ1OOOmm composite scintillation magnetic field selection machine (hereinafter referred to as selection machine).
The structure of the selection machine:
(1) In order to make the slurry fully separated inside the finishing machine, it is necessary to ensure sufficient sorting zone height. For this purpose, multiple coils are used in series to be superimposed, and the fixed field coil is designed at the top, and the fixed magnetic field is manually adjusted. Strength to make a final selection of the overflowing slurry to prevent the top overflow from turning black. A permanent magnet magnetic ring is installed on the upper part of the grit hopper to reduce the influence of fluctuations of the rising water flow on the sedimentation of the concentrate and accelerate the sedimentation process.
(2) In order to change the magnetic field generated by the coil according to the change in the concentration of the slurry, the current in the coil is adjusted by detecting the concentration of the sorting zone. When the concentration of the sorting zone increases, by increasing the current of the coil, the force of the magnetic field on the magnetically permeable particles in the slurry is increased, and the magnetic particles are prevented from overcoming the flushing force of the water flow to cause the overflow to turn black; when the concentration of the sorting zone is decreased, A sufficient overflow of the weak magnetic particles is achieved by reducing the current in the coil to attenuate the magnetic field.
(3) Adjusting the settling speed of the magnetically permeable particles by adjusting the energization switching frequency of the coil to achieve the optimal process requirements. The structure of the selection machine is shown in Figure 2, and its characteristics are as follows:
(1) The selection machine improves the processing capacity of a single machine by making full use of the electromagnetic field generated by the electromagnetic coil. The electromagnetic coil works in the slurry, so that the formed internal and external electromagnetic fields are fully utilized, and the processing capacity of the single-machine equipment is greatly improved.
(2) The selection machine combines the magnetic system of the magnetic concentrator with the magnetic system of the permanent magnetic dehydration tank, and combines the magnetic system with the permanent magnet and the electromagnetic phase, thus forming an electromagnetic magnetic system and a permanent magnetic field. The composite magnetic system is formed to ensure that the mineral is subjected to a magnetic field multiple times in order to achieve a complete agglomeration and to improve the sorting effect.
(3) There is a fixed magnetic field coil on the top of the selection machine, the purpose is to keep the overflow surface stable and not “turning black to run mineâ€. The other coils are intermittently and intermittently supplied with power in a certain time sequence to generate a scintillation magnetic field, so that the magnetic minerals are fully agglomerated, dispersed, and agglomerated in the slurry. The current intensity, power supply time, intermittent time and number of spaced coils of the power supply are adjustable. The electromagnetic magnetic system not only agglomerates the magnetic minerals but also acts under the magnetic force of the downward direction, and also increases the space for the dispersion of the magnetic minerals, thereby improving the precision of the sorting.
(4) The degree of automation is higher, which improves the adaptability of the selection. By adding a concentration detecting device in the sorting area and through the proportional, integral and differential controllers, not only the automatic adjustment of the electromagnetic field strength is realized, but also the automatic adjustment of the opening of the underflow discharging valve and the rising water solenoid valve is realized, so that the selecting machine is always In the best selection state, no adjustments are required for the operation.
(5) The structure is more advanced, the diameter-to-length ratio of the cylinder is much larger than that of the magnetic condenser, and the selection time is fully considered, so that the magnetic mineral and the gangue mineral and the continuum can be sufficiently separated. In addition, the diameter of the top of the cylinder shrinks, the cross-sectional area decreases, and the flow rate of the rising water is increased, so that the impurities that are out of the magnetic field are discharged as soon as possible, and finally the fine particles in the concentrate are effectively removed, and the coarser particles are fully removed. The purpose of the grade impurities.
The compound scintillation magnetic field selection machine has been successfully developed by Shougang Mining Co., Ltd. and obtained the national utility model patent. The new technology investment province, quick effect, simple transformation, suitable for the transformation of the old plant of the magnetic separation plant and the application and promotion of the new plant construction, can bring good economic and social benefits to the enterprise, and is the most suitable magnetic separator in the magnetic separation plant. The high-efficiency selection of technical equipment has broad application prospects in China.
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