Separation of silica from bauxite via froth flotation

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• 作者：C.P. Massola ; A.P. Chaves ; J.R.B. Lima ; C.F. Andrade
• 关键词：Froth flotation ; Non-ferrous metallic ores ; Tailings
• 刊名：Minerals Engineering
• 出版年：2009
• 出版时间：March 2009
• 年：2009
• 卷：22
• 期：4
• 页码：315-318
• 全文大小：242 K

文摘

This paper reports an innovative development: concentrating gibbsite via reverse froth flotation in order to obtain a metallurgical-grade bauxite concentrate. Tailings from an industrial plant have undergone attrition scrubbing and desliming; the quartz silica contained in the tailings has undergone flotation. Starch was used as a depressant, and ether-amine as the cationic collector. Optimum pH is around 10.0. In pilot plant scale, a metallurgical-grade concentrate was obtained by assaying 42.3 % available alumina with an alumina/insoluble silica mass ratio of 11.1. It contained the gibbsite and the iron and titanium bearing minerals. The concentrate was further upgraded by magnetic separation, leading to 54.0 % available alumina, with an alumina/insoluble silica mass ratio of 12.6 at an overall available alumina recovery of 69.3 % in the final concentrate (non-magnetic product).