Research on Alumina Preparation from Aluminium Chloride Solution by Electrolysis Process

Abstract

During the technology of extracting Al2O3 and other valuable elements in high-alumina fly ash by hydrochloric acid method, the process of AlCl3 transformed into Al2O3 has many problems, such as the long technological process and the large investment in equipment. In this paper, a new method of the direct-electricity conversion technology is proposed, for dealing with aluminium chloride solution. Namely, using the method of electrolysis and taking CO2 injection to improve the pH of solution, which make the aluminum precipitate in the form of carboaluminates. Then after roasting, Al2O3 can be acquired. The influences of the initial AlCl3 concentration and the composition of the solution in the cathode side of the cell on the electric conversion process have been studied and the roasting products have been characterized.