This paper took a low aluminum-silicon ratio bauxite in Shandong province as the research object .In order to achieve the purpose of iron removal and desilication ,adopted a joint process of magnetic separation and flotation to obtain a good technical indicator .Raw ore aluminum-silicon ratio was 3 .18 .With the grinding fineness is 94 .55％ -0 .074 mm ,the process of weak-intensity magnetic separation ,high-intensity magnetic separation and flotation was selected .The low magnetic field strength was 1 .2 × 105 A/m and the strong magnetic field strength was 9 .6 × 105 A/m .The dosage of sodium carbonate as the modifier was 3500 g/t ,while sodium hexametaphosphateas the inhibitor was 40 g/t ,and sodium oleate as the collector was 1200 g/t .As a result ,the concentrate got a 9 .04 ratio of aluminum-silicon .The grade of aluminum was 62 .47％ ,and the recovery was 62 .74％ .%以山东某低铝硅比铝土矿为研究对象,为了实现其降铁、降硅的目的 ,采用磁选和浮选联合工艺流程,获得较好的工艺指标.原矿铝硅比3.18,在磨矿细度-0.074 mm 94.55％ 的条件下,采用"弱磁-强磁-浮选"工艺流程,弱磁场强度1.2×105A/m,强磁场强度9.6×105A/m,以碳酸钠为调整剂,用量3500g/t,六偏磷酸钠为抑制剂,用量40g/t,油酸钠为捕收剂,用量1200g/t,最终获得精矿产品铝硅比为9.04,铝品位为62.47％,回收率为62.74％.
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