高硅铝土矿正浮选两段脱硅试验研究

本文以云南鲁甸高硅低铝硅比型铝土矿为研究对象,通过正浮选阶段磨矿阶段选别、两段脱硅工艺流程获得了较好的铝土矿精矿,浮选指标良好。原矿含Al2O360.78%、Si O220.84%,铝硅比(A/S)为2.92,主要脉石矿物为白云母、石英等。通过在粗磨条件下进行一段浮选脱硅,粗精矿再磨再选后进行二段浮选脱硅,产出合格精矿。粗精矿再磨后进行五次精选,闭路试验获得精矿产率为64.74%、Al2O370.83%,Si O28.40%、A/S为8.43、Al2O3回收率为75.83%的良好指标。

Experimental study of separation silicon from a high silicon bauxite by direct flotation with two stage

This paper reports an innovative development: the separation of silicon from bauxite with two stages by the stage grinding and stage flotation via the direct flotation, and obtained the high quality bauxite concentrate, the flotation index is favorable. The raw ore contains Al₂O₃ 60.78%, SiO₂ 20.84%, the Al₂O₃ to SiO₂ mass ratio (A/S) is 2.92, the main gangue minerals are kaolinite, quartz etc. Through the first flotation by the coarse grinding and separation a part of the silicon, then the rough concentrate for the secondary flotation after the regrinding and separation other part of the silicon, obtained the qualified concentrate. The rough concentrate via the five times clean flotation after regrinding. The closed-circuit test obtained the indexes with the concentrate contains Al₂O₃ 70.83%, SiO₂ 8.40%, the A/S is 8.43, the recovery of Al₂O₃is 75.83%.