锌窑渣中碳铜银铁综合回收试验研究

Experimental study on comprehensive recycling of carbon,copper,silver,iron from zinc kiln slag

锌窑渣通常含有大量炭粉和许多有价金属元素。云南某锌窑渣中含碳22.31%、铜1.33%、银294 g/t、铁23.41%等有价元素,具有较高的回收利用价值。针对该锌窑渣的性质,进行了浮选—磁选联合工艺试验研究。其结果表明:该工艺可获得碳品位78.55%、碳回收率92.60%的炭粉,铜品位8.13%、铜回收率78.61%、含银1 890 g/t的铜精矿以及铁品位66.02%、铁回收率76.33%的铁精矿,且均实现了较高的回收率。

There are usually large amounts of carbon powders and many valuable metal elements in zinc kiln. The zinc kiln slag from Yunnan contains 22.31% carbon, 1.33 % copper and 294 g/t silver,23.41% iron and other val- uable elements, which makes it have high recycling value. Based on the property of the zinc kiln slag, the paper carried out experimental study on a combined flotation - magnetic separation process. The results show that the process can ob- tain carbon powders with carbon grade of 78.55 % ,carbon recovery rate of 92.60 % ; copper concentrates with cop- per grade of 8.13 % ,copper recovery rate of 78.61% and Ag grade of 1 890 g/t; and iron concentrates with iron grade of 66.02 %, iron recovery rate of 76.33 %. A fairly high recovery rate is achieved.