硫酸铵在煤粉炉粉煤灰提取氧化铝活化工艺过程中的应用研究  

Study on alumina extraction from fly ash of coal powder boiler by ammonium sulfate activation

作　　者：张云峰 白健 高志娟 王永旺 陈东 Zhang Yunfeng;Bai Jian;Gao Zhijuan;Wang Yongwang;Chen Dong(Shenhua Zhungeer Energy Resources Development Co.,Ltd.Research&Project Demonstration Center of Comprehensive Utilization of Coal and Associated Resources,Ordos 010300,China)

机构地区：[1]神华准能资源综合开发有限公司研发中心,内蒙古鄂尔多斯010300

出　　处：《轻金属》2018年第8期14-18,共5页Light Metals

摘　　要：主要研究硫酸铵对煤粉炉粉煤灰焙烧活化效果,探讨焙烧温度、焙烧时间、硫酸铵盐的用量以及采用盐酸溶出等工艺条件对煤粉炉粉煤灰中Al_2O_3的溶出率的影响。利用扫描电子显微镜和X射线衍射仪对焙烧熟料和酸溶残渣的微观形貌和物相组成进行表征。此外,还研究了本地区煤粉炉粉煤灰矿物组成、物相组份。研究结果表明:在焙烧温度为400℃,焙烧时间3小时,硫酸铵:粉煤灰(质量比)为5:1时,采用盐酸溶出熟料,氧化铝溶出率可以达到85.4%。此外,煤粉炉粉煤灰中铝硅比约为1.2,氧化铝存主要存在于莫来石和玻璃体中,氧化铝活性较差。The effect of ammonium sulfate on the calcination of fly ash from coal powder boiler was studied.The influence of technical conditions on dissolution rate of Al 2O 3 was examined,including calcination temperature and time,ammonium sulfate dosage and extraction with hydrochloric acid and other factors respectively.The microstructure and phase composition of the clinker and liquid-leached residue were characterized by scanning electron microscopy and X-ray diffractometry.In addition,the mineral and phase composition of fly ash were also studied.The results show that when the temperature is 400℃,the time is 3 hours and the mass ratio of(NH 4)2SO 4 and Al 2O 3 is 5:1,the leaching rate of alumina can reach 85.4%by hydrochloric acid.The mass ratio of Al 2O 3 and SiO 2 is about 1.2,the alumina mainly exists in the mullite and glass phase,and the alumina activity is poor.

关 键 词：煤粉炉粉煤灰 硫酸铵 焙烧 氧化铝 

分 类 号：TF032[冶金工程—冶金物理化学]