山西某磁选铁精矿浮选脱硫试验

山西某磁选铁精矿铁品位为65.16%,S含量高达2.62%,主要铁矿物为磁铁矿,占总铁的92.23%;含硫矿物主要为磁黄铁矿和黄铁矿,分别占总硫的53.72%和45.67%,硫在粗粒级(+100目)和细粒级(-325目)的含量相对较高,超过70%的硫分布在-200目粒级。为降低该铁精矿中的硫含量,进行了反浮选脱硫试验。结果表明,试样采用1粗1精-粗选与精选尾矿合并扫选,扫选精矿返回粗选的闭路浮选流程处理,在粗选+精选丁基黄药用量为400+100 g/t、H106用量为950+450 g/t、松醇油用量为50+20 g/t的情况下,可获得铁品位为66.59%、含硫0.29%、铁回收率为91.40%的铁精矿和硫品位为22.13%、含铁52.75%、硫回收率为90.07%的硫精矿。

Experimental Research on Flotation Desulfurization of a Magnetic Separation Iron Concentrate in Shanxi

The iron grade of magnetic separation concentrate is 65.16% and the contents of sulfur is up to 2.62%. The major iron mineral is magnetite， accounting for 92.23% of total iron. The major sulfur minerals are pyrite and pyrrhotite， which account for 53.72% and 45.67% of the total sulfur， respectively. Sulfur is mainly in the coarse fractions （+100 mesh）and fine fractions （-325 mesh）， and more than 70% sulfur distributed below 200 mesh. In order to reduce the contents of sulfur， the reverse flotation desulphurization experiments are carried out with iron concentrate. The results showed that the sample is treated with closed-circuit process one roughing and one cleaning-scavenging with tailing of cleaning and scavenging， and concentrate of scavenging returning to roughing. In the case of butyl xanthate dosages of 400 g/t in roughing and 100 g/t in cleaning， H106 dosages of 950 g/t in roughing and 450 g/t in cleaning， and terpenic dosages of 50 g/t in roughing and 20 g/t in cleaning， iron concentrate was obtained with iron grade of 66.59%， sulfur grade of 0.29%， iron recovery rate of 91.40% and sulfur concentrate was obtained with sulfur grade of 22.13%， iron grade of 52.75%， sulfur recovery rate of 90.07%