弱磁-强磁工艺选别高铁铬铁矿的试验研究

Experimental Research on Low and High Intensity Magnetic Separations of Chromite Ore with High Iron Content

对某高铁铬铁矿先进行弱磁选回收磁铁矿,后采用强磁选回收铬铁矿。研究结果表明,磁场强度是影响选别指标的主要因素。对于Cr2O3品位为31.23%,TFe品位为28.81%的原矿,经磁场强度为0.12 T的弱磁选,可获得TFe品位为55.89%,回收率为58.71%的铁精矿;弱磁选尾矿再以磁场强度为0.9 T进行强磁选,可以获得Cr2O3品位为41.43%,回收率79.31%的铬精矿,实现了铬铁矿与磁铁矿的综合利用。

To treat a chromite ore with a high content of iron, a low intensity magnetic separation was introduced to recover magnetite, and a high intensity magnetic separation was adopted thereafter to reclaim chromite. The results indicate that magnetic field intensity is the main factor affecting separation index. For the ore with a head grade as 31.23 % of Cr2O3 and 28.8 1% of TFe, a magnetite concentrate with a TFe grade of 55.89% and a recovery of 58.71% was obtained from a low intensity magnetic separation with a field intensity of 0.12 T. The tailings from low intensity magnetic separation was further treated by adopting high intensity magnetic separation with a field intensity of 0. 9 T, a chromium concentrate with a Cr2O3 content of 41.43% and a recovery of 79.31% can be prepared. Under this circumstance the comprehensive utilization of ehromite and magnetitte can be actualized.