Leaching Alumina from Bauxite by Sulfuric Acid

In this paper,the leaching behaviour of alumina from bauxzite by sulfuric acid was described.The effects of sulfuric acid concentration,acid-leaching temperature,acid-leaching time,liquid to solid ratio and particle size of materials on leaching rate of alumina were investigated.The optimum conditions of the acid-leaching technology were established,that is,sulfuric acid concentration 90%,acid-leaching temperature 220℃,acid-leaching time 1h,liquid to solid ratio of 5∶1,particle size of materials is less than 141μm,leaching rate of alumina can reach more than 85%.