从锌窑渣中选矿回收碳、铁试验研究

Experimental Study on Recovery of Carbon and Iron from Zinc Kiln Slag by Beneficiation

研究了从锌窑渣中选矿回收有价元素碳和铁。采用浮选优先回收碳,浮选尾矿再磨再磁选回收铁的选矿工艺处理锌窑渣,结果表明,碳的较佳浮选回收条件为磨矿细度-0.074 mm 75 %,柴油用量1600 g/t,2~#油用量600 g/t,在此条件下获得的碳精矿碳品位为76.12%、碳回收率为85.60%;铁的较佳磁选回收条件为磨矿细度-0.074 mm 89.47%,磁场强度106 kA/m,在此条件下获得的铁精矿铁品位为64.23%、铁回收率为68.42%。为此类废渣的开发利用提供了高效、经济途径。

The recovery of valuable elements carbon and iron from zinc kiln slag by beneficiation was studied.Zinc kiln slag was treated by flotation to recover carbon preferentially and flotation tailings to regrind and magnetic separation to recover iron.The results showed that optimum flotation recovery conditions for carbon is that the grinding fineness-0.074 mm accounts for 75%,Diesel oil consumption is 1600 g/t and No.2 oil consumption is 600 g/t.Under these conditions,the carbon grade of carbon concentrate was 76.12%,and the carbon recovery rate was 85.60%.The optimum conditions for recovery of iron by magnetic separation is that the grinding fineness-0.074 mm accounts for 89.47%,the magnetic field intensity is 106 kA/m.On these conditions,the iron grade of iron concentrate is 64.23%and the iron recovery rate is 68.42%.It provides an efficient and economical way for the development and utilization of this kind of waste residue.