1 Permanent magnet roller type magnetic separator The magnetic components of the permanent magnet roller type strong magnetic separator adopt high-performance annular magnetic material, and the pure iron piece is alternately mounted on the stainless steel shaft to form a magnetic roller. The magnetic system is an open structure, and the magnetic field of the magnetic roller can reach 1.4T or more. . At present, many units in China have developed a variety of models, the largest roller diameter has reached 350mm. According to the production process requirements, multiple magnetic rollers can be arranged on the same device for multiple sorting. During operation, the material is fed to the thin roller by the vibrating feeder and is brought to the surface of the magnetic roller. The magnetic material is adsorbed on the belt under the action of the magnetic field force, and falls into the receiving hopper after leaving the magnetic field, and the non-magnetic material is not affected by the magnetic field. The role of force is directly thrown away. The RGC type double-roller strong magnetic separator is used in the removal of iron from Xinjiang andalusite . The ore is crushed to below 5 mm for two sorting, and Al2O355%-58% of andalusite concentrate can be obtained, of which Fe203 is less than 1%. The recovery rate is 62%; the TYCX roller type strong magnetic separator is used to remove the iron from the nepheline. When the ore particle size is 0.1-0.4 mm, the Fe203 content can be reduced from 1.79% to 0.16%; the CRIMM type permanent magnet roller is used. type strong magnetic separator potassium feldspar iron ore operations for different maximum particle size of iron up to 86%. 2 permanent magnet type strong magnetic separator The permanent magnet type strong magnetic separator adopts a squeezed magnetic structure, and the outer part of the magnetic system is a stainless steel cylinder, and the magnetic field strength of the simplified surface can reach 0.9 T or more. Compared with the permanent magnet roller type strong magnetic separator, the machine has the following advantages: First, the material is directly fed to the surface of the magnetic cylinder through the vibrating feeder, which overcomes the wear and tear of the ultra-thin belt of the permanent magnet roller type magnetic separator. The problem of replacement, the magnetic field utilization rate is higher; second, the diameter of the magnetic cylinder can be designed to be large, and has reached 900 grids. The disadvantage is that the magnetic field strength is low and the processing capacity is small. The machine can be used for the material of quartz sand, feldspar, vermiculite, rutile, cassiterite, titanium alloy, iron purification. When RT-type permanent magnetic dry magnetic separator is used to recover ilmenite in Hainan coastal sand, the content of TiO2 in the ore is 2.4%, and the concentrate containing 37% of Ti02 can be obtained, and the recovery rate is 75%; in Sichuan and other places. In the application of quartz sand removal, the Fe2O3 content can be reduced from 0.15% to less than 0.05% after one sorting. 3 permanent magnet vertical ring type magnetic separator Because the electromagnetic vertical ring magnetic separator has the disadvantages of high energy consumption, complicated operation and maintenance, and high operating cost, many institutions at home and abroad have developed a permanent magnet magnetic system vertical ring magnetic separator, such as the high performance of the Beijing Research Institute of Mining and Metallurgy. neodymium-iron-boron magnet developed PVM-1500 vertical ring type permanent magnet strong magnetic separator, sorting ring diameter width 400 mm, background magnetic field strength of 0.7 T or more, the magnetic field intensity on the sensitive medium above 1.2 T: Shan Institute of mining And the Zhengzhou Minerals Comprehensive Utilization Research Institute developed the YMG type and LYC type permanent magnet vertical ring magnetic separator. According to the test results, the newly developed permanent magnet vertical ring magnetic separator has achieved the same sorting index as the electromagnetic magnetic separator in the separation of weak magnetic minerals and non-metallic minerals. 4 other types of strong magnetic separation equipment Northeastern University has developed a PHGM type permanent magnet strong magnetic separator. The machine has designed a permanent magnet magnetic system in a vertically placed cylinder. The magnetic field strength of the cylinder surface can reach 0.65 T or more. There is a magnetic magnetic medium on the simplified surface. With the rotation of the cylinder, when the magnetic medium enters the magnetic field, the high magnetic induction intensity generated on the surface of the cylinder will capture the magnetic ore particles, carry them to the non-magnetic region with the rotation of the simplified body, and fall off under the flushing action of the unloading water flow. The machine has a maximum magnetic induction of 1.2 T. It has been reported that good results have been obtained in the tests of weak magnetic mineral separation and non-metallic ore removal. The Southern Metallurgical Institute has developed a YDQC permanent magnet belt type strong magnetic separator with a maximum magnetic field strength of 2 T. The basic structure is that a rotatable permanent magnet magnetic system is arranged inside the two parallel stainless steel strips. When working, the two stainless steel strips move in the same direction. After the slurry is fed, the magnetic material is adsorbed on the surface of the two steel strips and is taken out of the magnetic field. Non-magnetic minerals flow along the gap between the two belts.
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Application of Strong Magnetic Separation Equipment in Iron Removal from Non-Metallic Mines
With the development of high-performance permanent magnet materials, the magnetic field performance of the permanent magnet strong magnetic separator has been greatly improved. At present, the highest magnetic field has reached 1.5 T. Strong permanent magnetic separator with energy saving, low operating cost, has been widely used in iron and non-metallic ore.