某硫尾矿磁选精矿铁硫分离再选试验

为分离某硫铁矿尾矿经弱磁选后所得精矿中主要以磁铁矿和磁黄铁矿形式存在的铁和硫，使该资源得到利用，对其进行了再选试验。试验结果表明，采用浮选-弱磁选-焙烧工艺可达到分离目的：原磁选精矿经浮选后，可获得硫品位为31.08%、硫回收率为82.91%的硫精矿；浮选尾矿经弱磁选和焙烧后，可获得铁品位为62.61%、硫含量为0.21%、SiO₂含量为3.87%、对原磁选精矿铁回收率为31.03%的铁精矿。将所得硫精矿模拟制酸焙烧后对烧渣进行检测，烧渣铁品位为61.08%、硫含量为0.23%、SiO₂含量为5.09%，可直接作为铁精矿利用。

Reconcentration Test of Magnetic Concentrate of A Pyrite Tailings for Separation of Magnetite and Pyrrhotite

In order to make pyrite tailings fully used, an experiment was studied on the reconcertration of magnetic concentrate of pyrite tailings in which iron and sulfur were mainly hosted in magnetic and pyrrhotite.The results showed that there was a good separation effect of iron and sulfur by the process of flotation-low intensity magnetic separation-roasting.Flotation of original magnetic concentrate yielded pyrite concentrate with sulfur grade of 31.08%, and recovery level of 82.91%.Floatatien tailings after being low intensity magnetic separation and roasting could get the  iron concentrate with 62.61%TFe，0.21%S，3.87% SiO₂ and  with 31.03% iron recovery to original magnetic concentrate.The sulfur concentrations were roasted in the conditions of simulatively making sulfuric acid, and produced pyrite cinder contained 61.08%TFe, 0.23%S, 5.09% SiO₂, which could be used as iron concentrations.