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고순도 알루미나의 제조

Production of Alumina with High Purity

이만승|송시정
한국자원리싸이클링학회|2019.02|자원리싸이클링 (Resources Recycling)|제28권 제1호|pp. 15-22|DOI https://doi.org/10.7844/kirr.2019.28.1.15

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키워드

고순도 알루미나알콕사이드암모늄 명반암모늄 알루미늄 탄산염pure aluminaalkoxideammonium alumammonium aluminum carbonate
주제분류자원공학

초록

습식법으로 고순도 알루미나를 제조할 수 있는 알콕사이드 가수분해법, 암모늄 명반의 열분해법, 암모늄 알루미늄탄산염(AACH) 열분해법을 소개하였다. 상기 세 공정으로 알루미나 제조시 용액의 pH, 온도와 불순물이 알루미나의 상전이와 고순도에 미치는 영향을 조사했다. 알콕사이드와 암모늄 명반의 열분해법으로는 α와 γ알루미나의 제조가 가능하다. 그러나 AACH 열분해법으로는 γ 알루미나 제조는 어렵다.

Abstract

There are three hydrometallurgical methods by which pure alumina can be prepared, such as hydrolysis of aluminum alkoxides, thermal decomposition of ammonium alum and thermal cracking of ammonium aluminum carbonate (AACH). The effect of solution pH and temperature and the nature of the impurities on the phase transition and the purity of the alumina thus produced was investigated. Hydrolysis of aluminum alkoxides and thermal decomposition of ammonium alum produce α and γ alumina, while only α alumina can be produced by thermal cracking of AACH.

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