2014•Hydrometallurgy of ChinaRequires access
Leaching of Al_2O_3 From Red Mud Using Hydrochloric Acid
Ya Gao
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Abstract
Leaching of Al2O3 from red mud using hydrochloric acid was investigated.Through fivefactors and four-levels orthogonal tests,directviewing and variance analysis,the influence of various factors on leaching of alumina and optimum leaching conditions were determined.The results show that hydrochloric acid concentration,leaching temperature,ratio between liquid volume and solid mass and leaching time affect the alumina leaching,under the conditions of leaching temperature of 107℃,leaching time of 90 min,ratio between liquid volume and solid mass of 5∶1,hydrochloric acid concentration of 7mol/L,leaching rate of alumina is 72.07%.The leaching reaction is in line with fluid-porous solid reactions model.The equation about the alumina leaching rate and leaching time is determined.