贵州某低铝硅比铝土矿石浮选脱硅试验研究

贵州某低铝硅比铝土矿石Al2O3品位为6035%、SiO2含量为1353%，铝硅比为446；含铝矿物主要为一水硬铝石，含硅矿物主要为高岭石、伊利石、绿泥石。为确定该矿石的开发利用工艺进行了选矿试验。结果表明，矿样在一段磨矿细度为-0074 mm占7452%的情况下1粗1扫、粗精矿再磨细度为-0053 mm占8765%的情况下1粗3精2扫、中矿顺序返回闭路正浮选流程脱硅，获得了Al2O3品位为6749%、铝硅比为881、Al2O3回收率达7804%的铝土矿精矿，脱硅效果显著，为下一阶段工作的开展提供了依据。

Experimental Study on Flotation Desilication of a Low Alumina Silica Ratio Bauxite in Guizhou

A low alumina silica bauxite ore in Guizhou Province has Al2O3 grade of 60.35%、SiO2 content of 13.53% and alumina silica ratio of 4.46.The aluminous minerals are mainly diaspore,and the siliceous minerals are mainly kaolinite,illite,chlorite.In order to determine the development and utilization process of the ore,the beneficiation test was carried out.The results show that the ore sample has been treated with one roughing and one scavenging under the condition that the fineness of the first stage grinding is -0.074 mm content 74.52%.When the regrinding fineness of the coarse concentrate is -0.053 mm accounting for 87.65%,it is treated by one roughing three cleaning two scavenging,and the middle ore returns to the closed circuit positive flotation process in sequence for desilication,The bauxite concentrate with Al2O3 grade of 67.49%,alumina silica ratio of 8.81 and Al2O3 recovery of 78.04% is obtained.The desilication effect is significant,which provides a basis for the next stage of work.