The unit will be able to concentrate 30 t/h of dry ore, using magnetic separation technology with rare earth magnets. “Through this process, New Steel can deliver a concentrate with iron content up to 68%, from poor ore with content up to 40%, depending on its chemical and mineralogical composition,” Vale said.
In magnetic separation, the strong magnetic separator of coarse and medium-grained ore is usually dry-type strong magnetic separator; the fine-grained ore is usually wet-type strong magnetic separator. Because the grade of concentrate obtained by using one beneficiation method alone is not high, a combined process is often used:
The manganese ore magnetic separator produced by the Shicheng County Mining Machinery Plant in Jiangxi Province is a dry type strong magnetic separator which uses highquality NdFeB The magnetic field strength of the strong magnetic roller made of the material is up to 15000 Gauss which can effectively sort a variety of weak magnetic
Assuming that the amount of magnetic particles dropped by the separator is a nearly constant quantity, a higher percentage of recovery of iron is obtainable from a rich ore than from a leaner ore as the percentage of iron lost is evidently less.
Most of the iron minerals in a single magnetite ore are because of its simple composition, strong magnetism, easy grinding and easy separation, the weak magnetic separation method is often used. When the grinding particle size is greater than 0.2mm, most iron ore magnetic separation plants usually use one stage grinding-magnetic separation;
cylinder type magnetic separator whose diameter is less than 500mm, the magnetic intensity can made from 800 gauss to 9500 gauss. cylinder type magnetic separator whose diametere is from 500mm to 1200mm,the max magnetic intensity is 5000 gauss. the diameter size of roller type can made from 100mm to 600mmm.