氟化钾助溶法对粉煤灰中氧化铝溶出率的影响研究  

Study on extraction of aluminium oxide from fly ash by solubilization of potassium fluoride

作　　者：张小东 赵飞燕 郭昭华 王永旺 陈东 

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：《煤炭与化工》2017年第1期30-33,共4页Coal and Chemical Industry

基　　金：国家科技部"十二五"科技支撑计划项目(2011BAA04B05)高铝粉煤灰高效循环利用技术研究

摘　　要：针对传统工艺从煤粉炉粉煤灰中提取氧化铝提取率低的问题,采用了以KF·2H2O为焙烧助溶剂的方法,从粉煤灰中酸溶氧化铝,粉煤灰中氧化铝的溶出率可达95%以上。研究了焙烧配比、焙烧温度、溶出固液比、溶出温度、溶出时间等对粉煤灰中氧化铝溶出率的影响,并用XRD对烧结样品和酸浸渣进行了表征。研究结果表明,氟化钾助溶法对煤粉炉粉煤灰中的氧化铝活化效果明显,活化后主要相态为霞石,在焙烧配比为20∶19、焙烧温度为900℃、焙烧时间为1 h的最佳活化条件下及6 mol/L HCl、1/4的固液比、60℃溶出30 min的最佳溶出条件下,粉煤灰中氧化铝的溶出率达97%以上,且氟最终主要在酸浸渣里。In order to overcome the problem that exist in the technology of the lower extraction rate of alumininm oxide from fly ash, the acid dissdution method with KF 2H2O as firing cosolvent is used for extraction of aluminium oxide from fly ash, the extracting rate of alumium oxide is more than 95%.The effects of the amount of cosolvent, calcination temperature, solid-liquid ratio, digestion temperature and time ect. on the dissolution rate of alumium oxide in fly ash were investigated. The sintered samples and acid leaching residue were characterized by the XRD. The results show that solubilization of potassium fluoride has obvious activated effects for the alumium oxide in pulverized coal ash;in addition, the main phase is nepheline after activation, and finally, fluorine enters into the acid leaching residue;the extracting rate of alumium oxide in fly ash can reach up 97% under the optimal conditions of activation ratio of 20 ： 19, activation temperature of 900 %, activation time of 1 h, 6 mol/L HCI, solid-liquid ratio of 1 ： 4, and dissolution time in 30 rain at 60 ℃.

关 键 词：粉煤灰 氟化钾 溶出率 氧化铝 

分 类 号：TF821[冶金工程—有色金属冶金] X705[环境科学与工程—环境工程]