Journal of the Korean institute of surface engineering (한국표면공학회지)
- Volume 25 Issue 3
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- Pages.150-157
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- 1992
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- 1225-8024(pISSN)
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- 2288-8403(eISSN)
Recovery of Pure Alumina Powder from the Wasted Aluminum Etching Solution by Precipitation Method
알루미늄 에칭폐액으로부터 침전법에 의한 순수 알루미나분말의 회수
Abstract
A recovery process of pure alumina powder from the wasted aluminum etching solution of electrolytic condenser works was studied. The possibility of this process was considered in the basis of thermodynamic data nad physico-chemical properties for the recovered materials were tested. In order to obtain pure alumina, Fe3+ and Cu2+ in the solution as impurities were solvent-extracted, respectively, and then, Al3+ was precipitated by changing the pH of the solution. As the results, more than 99.9% of Al3+ in the solution was recovered by the precipitation method. The weight of the precipitate was reduced to about 65 wt.% of the original one by calcination and the sizes of the recovered powders were in order of 3-5
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