中国电力 ›› 2015, Vol. 48 ›› Issue (1): 64-67.DOI: 10.11930.2015.1.64

• 发电 • 上一篇    下一篇

碱法提取煤矸石中氧化铝试验条件优化

相亚军1,纪利春2,任根宽3   

  1. 1. 内蒙古工业大学能源与动力工程学院,内蒙古 呼和浩特 010062;
    2. 内蒙古工业大学化工学院,内蒙古 呼和浩特 010062;
    3. 宜宾学院化学与化工学院,四川 宜宾 644007
  • 收稿日期:2014-10-27 出版日期:2015-11-25 发布日期:2015-11-24
  • 作者简介:相亚军(1972—),女,内蒙古赤峰人,硕士,讲师,从事固体废物综合利用。E-mail: 331223839@qq.com

Optimization of Experimental Conditions for Alkaline Alumina Extraction from Coal Gangue

XIANG Yajun1, JI Lichun2, REN Genkuan3   

  1. 1. College of Energy and Power Engineering of Inner Mongolia University of Technology, Hohhot 010062, China;
    2. College of Chemical Engineering of Inner Mongolia University of Technology, Hohhot 010062, China;
    3. College of Chemistry and Chemical Engineering, Yibin University, Yibin 644007, China
  • Received:2014-10-27 Online:2015-11-25 Published:2015-11-24

摘要: 工业固体废物煤矸石中存在有价值的氧化铝,如能将其替代铝土矿提取氧化铝,则将变废为宝。然而,煤矸石中的铝、硅主要以高岭土形式存在,活性很低,因此需要通过高温破坏煤矸石中高岭土结构,才能将其中的氧化铝转化为可溶于碳酸钠溶液的铝酸钙。为了使煤矸石中的氧化铝尽可能多地溶出,采用正交试验方法分别对采用石灰烧结法提取煤矸石氧化铝的活化和溶出条件进行了优化。试验结果表明:采用石灰烧结法提取煤矸石氧化铝,最佳条件下煤矸石中氧化铝溶出率可高达89.5%,试验所确定的最佳条件可供工业试验参考。

关键词: 煤矸石, 氧化铝, 石灰烧结法, 氧化铝提取, 铝酸钙, 废物利用

Abstract: There exists valuable alumina in the industrial solid waste coal gangue which can become treasure when it substitutesfor bauxite for alumina extraction. However, the kaolin form of aluminum-silicon in the coal gangue has low activity, which has to be broken in high temperatures to change the alumina into soluble calcium aluminate in sodium carbonate solution. In order to achieve the maximal leaching rate of alumina in the coal gangue with lime sinter process, the experimental conditions for activation and extraction of coal gangue are optimized with orthogonal experiments respectively. The experimental results show that in the process of alumina extraction in coal gangue by the lime sinter process, the optimal alumina leaching efficiency can be as much as 89.5%. Therefore, the optimized experimental condition may provide a reference for industrial tests.

Key words: coal gangue, alumina, lime sinter process, leaching efficiency, calcium aluminate, waste recovery

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