某硫铁矿烧渣选铁除砷工艺研究

针对武汉某化工公司的硫铁矿烧渣进行弱磁选富集铁矿物-化学法除砷试验，结果表明：在磨矿细度为-0.038 mm占80%、磁场强度为160 kA/m的条件下弱磁选1次，所得精矿铁品位为61.91%、铁回收率为92.96%、硫含量为0.682%、砷含量为0.381%；弱磁选精矿以盐酸作浸出药剂，在矿浆浓度为40%、酸固比为1∶25、搅拌强度为300 r/min条件下浸出40 min，滤除废酸后用水清洗3次，最终能够制备出铁品位为63.35%、铁回收率为92.88%、硫含量为0.325%、砷含量为0.083%的铁精粉。如何在保证脱砷效果的同时提高硫的脱除率是需要进一步研究的课题。

Study on Iron Recovery and Arsenic Removal to A Pyrite Cinder

The processing technology of the pyrite cinder from a chemical plant in Wuhan is that the iron recovered by low intensity magnetic separation and arsenic removed by chemical method.The conditions of low intensity magnetic separation include grinding fineness-0.038 mm 80%,magnetic field intensity 160 kA/m,under which the iron concentrate containing Fe 61.91%,S 0.682% and As 0.381% with the iron recovery 92.96% was obtained by one stage magnetic separation.The conditions of chemical leaching of iron concentrate by hydrochloride include pulp density 40%,ratio of hydrochloride and the solid(iron concentrate) 1∶25,the leaching time 40 min,the agitation intensity 300 r/min and washing 3 times after filtering waste acid,under which the iron concentrate assaying Fe 63.35%,S 0.325% and As 0.083% with the iron recovery 92.88% iron grade 63.35% can be achieved.How to ensure the effectiveness of arsenic removal while increasing the sulfur removal rate is need for further study.