摘要
研究用盐酸从煤矸石中提取氧化铝的浸出动力学,并研究焙烧活化温度和浸出条件对氧化铝提取率的影响。实验结果表明,在最佳煅烧温度700℃、浸出温度150℃、反应2 h、盐酸浓度20%和液固比3:1的条件下,氧化铝提取率可达91.56%,随着氧化铝的浸出,锂的协同浸出率可同时达到80.00%。研究表明,氧化铝浸出过程符合收缩未反应核模型,且受化学反应控制,反应活化能为45.64 kJ/mol。
The leaching kinetics of alumina extraction from coal gangue with hydrochloric acid was investigated.The effects of calcination activation temperature and leaching conditions on the alumina extraction efficiency were studied.The results revealed that the alumina extraction efficiency can reach 91.56%under the following optimum conditions:a calcination temperature of 700℃,dissolution at 150℃for 2 h in hydrochloric acid with a concentration of 20%,and a liquid-to-solid ratio of 3:1.Notably,lithium was leached simultaneously with alumina,and its leaching rate reached 80.00%.The leaching of alumina followed the shrinking unreacted core model,and the process was controlled by a chemical reaction,with activation energy of 45.64 kJ/mol.
作者
张宇娟
孙俊民
吕国志
张廷安
公彦兵
Yu-juan ZHANG;Jun-min SUN;Guo-zhi LÜ;Ting-an ZHANG;Yan-bing GONG(College of Chemical Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;National and Local Joint Engineering Research Center for High Value Utilization of Coal-based Solid Waste,Hohhot 010051,China;Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education,Special Metallurgy and Process Engineering Institute,Northeastern University,Shenyang 110819,China)
基金
supported by the National Key R&D Program of China(No.2021YFE0102200)
the Inner Mongolia Natural Science Foundation,China(No.2020MS05063)
the Inner Mongolia Science and Technology Plan Project,China(No.2020GG0230)。
关键词
煤矸石
酸浸
煅烧活化
浸出动力学
氧化铝
coal gangue
acid leaching
calcination activation
leaching kinetics
alumina
