Abstract
A new electrotransformation process based on bubbling CO2 into the electrolyte in an electrolytic process to cause precipitation of aluminum salt is proposed herein to solve problems such as the high energy consumption in the process of alumina extraction by acid leaching. The effects of different additives in this electrotransformation process applied to aluminum chloride solution and the resulting roasting products were studied. When using different additives (HCl, Na2CO3, and NaHCO3) at an initial concentration of 10 g/L, the solution pH value and solution temperature gradually increased with increasing electrotransformation time, and the final pH value approached 3.2. The roasting products were all sheet alumina with cubic crystal structure. Use of all the additives refined the granularity of the alumina product, improved the solution conductivity, and increased the chlorine content in the alumina product. Addition of HCl improved the recovery rate of Al, but use of the additives Na2CO3 and NaHCO3 greatly reduced the recovery rate of Al.
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