Magnetic separation studies for a low grade siliceous iron ore sample

Investigations were carried out, on a low grade siliceous iron ore sample by magnetic separation, to establish its amenability for physical beneficiation. Mineralogical studies revealed that the sample consists of magnetite, hematite and goethite as major opaque oxide minerals where as silicates as well as carbonates form the gangue minerals in the sample. Processes involving combination of classification, dry magnetic separation and wet magnetic separation were carried out to upgrade the low grade siliceous iron ore sample to make it suitable as a marketable product. The sample was first ground and each closed size sieve fractions were subjected to dry magnetic separation and it was observed that limited upgradation is possible. The ground sample was subjected to different finer sizes and separated by wet low intensity magnetic separator. It was possible to obtain a magnetic concentrate of 67% Fe by recovering 90% of iron values at below 200 lm size.

铁矿石干式磁选工艺在露天矿的应用

采用永磁干式磁选技术处理废石混入率严重超标的磁铁矿石对于提高铁矿石资源的回收利用率、降低矿石开采成本、增加矿山经济效益有着重要的作用和意义。本文结合实际论述了该工艺技术的流程、方法和性能特点，总结了应用效果，指出了应注意的问题。