Extraction of alumina from fly ash by ammonium hydrogen sulfate roasting technology  

硫酸氢铵焙烧粉煤灰提取氧化铝(英文)

作　　者：王若超[1] 翟玉春[1] 吴晓卫[1] 宁志强[1] 马培华[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110819

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第5期1596-1603,共8页中国有色金属学报（英文版）

基　　金：Project(2007CB613603)supported by the National Basic Research Program of China;Project(2013M530934)supported by the China Postdoctoral Science Foundation

摘　　要：NH4HSO4 roasting technology was used for preparing Al2O3 from fly ash. First, Al and Fe were extracted from fly ash by NH4HSO4 roasting and deionized water leaching. Then, the Al and Fe in the leached liquid were precipitated by adding NH4HCO3 solution. After the mixed precipitations of Al（OH）3 and Fe（OH）3 were leached by NaOH solution, the NaAl（OH）4 solution was decomposed by carbonation. Finally, the pure Al（OH）3 was calcined to α-Al2O3. The optimal conditions of the whole technology were determined by experiments. The quality ofa-Al2O3 product is up to the technical indicator of YS/T 274-1998 standard.采用NH4HSO4焙烧法从粉煤灰中提取Al2O3。首先,通过NH4HSO4焙烧和去离子水浸出法提取粉煤灰中的Al和Fe;然后,加入NH4HCO3溶液沉淀浸出液中的Al和Fe,利用NaOH溶液浸出得到的Al(OH)3和Fe(OH)3混合沉淀,所得铝酸钠溶液经碳酸化分解得到纯净的Al(OH)3;最后,煅烧纯净的Al(OH)3制备α-Al2O3产品。通过实验确定各工艺流程的最佳条件。制备的α-Al2O3产品达到YS/T 274-1998标准的工艺指标。

关 键 词：fly ash ammonium hydrogen sulfate ALUMINA EXTRACTION 

分 类 号：TD849[矿业工程—煤矿开采] TQ133.1[矿业工程—矿山开采]