日本金属学会誌

J. Japan Inst. Metals, Vol. 52, No. 11 (1988),
pp. 1080-1087

Recovery of Pure Alumina from the Waste Acid Solution in Electro-Condenser Works

Sumiko Sanuki1, Masahiro Hasegawa1, Koichi Arai1, Toshio Izaki1 and Hiroshi Majima2

1Department of Metallurgical Engineering, Faculty of Engineering, Toyama University, Toyama
2Department of Metallurgy, Faculty of Engineering, Kyoto University, Kyoto

Abstract:

The feasibility of new recovery process of pure alumina from the waste acid solution of electro-condenser works was investigated from a thermodynamic consideration and an experimental study based on the results of solvent extraction of Fe3+ and Al3+ from the waste acid solution, the crystallization of AlCl3•6H2O with HCl gas from the waste acid solution, the calcination of AlCl3•6H2O and the X-ray diffraction analysis of Al2O3.
The experimental results are summarized as follows:
(1)  The extraction of Fe3+ with Amberite LA-1 from the waste acid solution in electro-condenser works is available. However, the extraction of Al3+ with Versatic Acid 10 is not so effective that it is difficult to use the separation of Al3+ from the waste acid solution containing a high concentration of Al3+.
(2)  The crystallization of AlCl3•6H2O with HCl gas from the waste acid solution is available, and AlCl3•6H2O of high purity is obtained. However, the crystallization of AlCl3•6H2O with HCl gas from the waste acid solution containing a high concentration of Fe3+ is contaminated with Fe3+. Therefore, the removal of Fe3+ is necessary before the crystallization of AlCl3•6H2O.
(3)  High-purity Al2O3 can be recovered by the calcination of AlCl3•6H2O.
(4)  From the thermodynamic consideration and the experimental study, it is concluded that a new recovery process of pure alumina from the waste acid solution in electro-condenser works is available.


(Received 1988/1/13)

Keywords:

recovery of alumina, hydrometallurgical treatment, solvent extraction, crystallization of AlCl3•6H2O, hydrogen chloride gas, waste acid solution of electro-condenser, calcination, Amberite LA-1, Versatic Acid 10


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