Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Production of Alumina with High Purity

고순도 알루미나의 제조

  • Song, Si Jeong (Department of Advanced Materials Science & Engineering, Mokpo National University) ;
  • Lee, Man Seung (Department of Advanced Materials Science & Engineering, Mokpo National University)
  • 송시정 (목포대학교 공과대학 신소재공학과) ;
  • 이만승 (목포대학교 공과대학 신소재공학과)
  • Received : 2018.11.30
  • Accepted : 2019.01.03
  • Published : 2019.02.28
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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 ${\alpha}$ and ${\gamma}$ alumina, while only ${\alpha}$ alumina can be produced by thermal cracking of AACH.

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 ${\alpha}$와 ${\gamma}$알루미나의 제조가 가능하다. 그러나 AACH 열분해법으로는 ${\gamma}$알루미나 제조는 어렵다.

Keywords

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Fig. 1. Structure transformation of alumina and aluminum hydroxides 34).

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Fig. 2. Process for the production of alumina by aluminum alkoxide method.

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Fig. 3. Effect of pH and reaction temperature on the nature of product during the treatment of ammonium aluminum carbonate hydroxide (AACH)38).

Table 1. Nomenclatures of alumina and aluminum hydroxide 34)

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Table 2. Phase transition scheme of alumina according to starting materials 6)

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