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›› 2002, Vol. 2 ›› Issue (4): 0-0.

• 4 •    

碳酸铝铵低温热分解制备a-Al2O3超细粉末

杨晔，吴玉程，李勇，崔平   

  1. 1. 合肥工业大学材料科学与工程学院, 安徽 合肥 230009；2. 中国科学院固体物理研究所, 安徽 合肥 230031
  • 出版日期:2002-08-20 发布日期:2002-08-20

Preparation of Ultrafine a-Al2O3 Powder by Thermal Decomposition of AACH at Low Temperature

YANG Ye1, WU Yu-cheng1,2, LI Yong2 , CUI Ping2   

  1. Inst. Chem. Metall., Chinese Academy of Sciences, Beijing 100080, China
  • Online:2002-08-20 Published:2002-08-20

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被引次数

132

摘要： 利用硫酸铝铵溶液和碳酸氢铵溶液的沉淀反应制备碳酸铝铵前驱体，通过在碳酸铝铵中同时添加α–Al2O3籽晶和硝酸铵, 使得α相的转变温度从1150℃降低到950℃, 获得了尺寸均匀、团聚较小、平均粒径为90 nm的球形α–Al2O3超细粉末. 相变过程为：无定型→g→g+α→α，并没有出现高温过渡型相q相.

关键词: α–Al2O3超细粉末, 碳酸铝铵, 制备, 相变

Abstract: Bioleaching of Ni, Cu and Co from the Jinchuan low-grade Ni–Cu–Co sulfide ore has been investigated with aerated leaching, agitated leaching with air bubbling, and column leaching respectively. The highest recovery was achieved in the aerated leaching. Leaching 20 d with pulp density of 15%, the leached Ni, Cu and Co were 95.4%, 48.6% and 82.6% respectively. By agitated leaching with air bubbling for 14 d at the pulp density of 25%, the leached Ni, Cu and Co were 80.2%, 45.2% and 78.4% respectively. With column leaching for 49 d, the leached Ni, Cu and Co were 48.5%, 37.5% and 33.6% respectively.

Key words: a-Al2O3 ultrafine powder, AACH, preparation, phase transformation

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