碱法提取煤矸石中氧化铝试验条件优化  

Optimization of Experimental Conditions for Alkaline Alumina Extraction from Coal Gangue

作　　者：相亚军[1] 纪利春[2] 任根宽[3] 

机构地区：[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

出　　处：《中国电力》2015年第1期64-67,共4页Electric Power

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。There exists valuabl alumina in the industrial solid waste coal gangue whieh 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 proeess, the experimental conditions for activation and extraction of coal gangue are optimized with orthogonal experiments respectively. The experimental resuhs show that in the process of alumina extraction in coal gangue by the lime sinter process, the optimal alumina leaching efficiency can be as mueh as 89.5%. Therefore, the optimized experimental condition may provide a referenee for industrial tests.

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 

分 类 号：TQ133.1[化学工程—无机化工]