2012•Nonferrous MetalsRequires access

Study on Aluminum Recovery from Red Mud with Hydrochloric Acid

Shenghu Li

Abstract

The hydrochloric acid leaching process of aluminum from Bayer red mud was studied.The effects of temperature,time,ratio of liquid to solid(L/S) and concentration of hydrochloric acid on aluminum leaching rate were investigated.The industrial experiment of aluminum recovery from red mud was conducted.The results show that factors affecting the rate of aluminum extraction in sequence are temperature,L/S,hydrochloric acid concentration and leaching time.The leaching rate and recovery rate of aluminum from red mud is 88.13% and 80.26% respectively after two-step leached at 80℃,evaporation,de-titanium,de-calcium,neutralization and dissolving with sodium hydroxide solution.

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Key concepts: Red mud, Hydrochloric acid, Leaching (pedology), Sodium hydroxide, Dissolution, Aluminium, Chemistry, Nuclear chemistry