硅酸盐通报2025，Vol.44Issue(1)：202-211,10.DOI:10.16552/j.cnki.issn1001-1625.2024.0793
富高岭石煤矸石中铝和硅的浸出及动力学研究
Leaching and Kinetics of Aluminum and Silicon from Kaolinite-Rich Coal Gangue
摘要
Abstract
Kaolinite-rich coal gangue contains a large amount of SiO2 and Al2O3.In this work,the coal gangue was selected to leach the Al2O3 by using hydrochloric acid and then to leach the SiO2 from the acid leaching slag by NaOH alkaline.The effects of acid leaching concentration,acid leaching temperature,acid leaching time and liquid-solid ratio on the leaching rate of Al2 O3 from calcined coal gangue were investigated,and the effects of alkaline leaching conditions on the leaching rate of SiO2 from acid leaching slag were also explored.The results show that when the conditions of acid leaching and alkali leaching are optimized by single variable experiment,the leaching rate of Al2O3 in coal gangue is 92.6％,and the leaching rate of SiO2 in acid leaching residue is 99.1％.The study of the kinetic models of acid leaching and alkaline leaching processes shows that,the kinetics model of the acid leaching process of coal gangue is in accordance with the mixed control model of internal diffusion and chemical reaction,while the alkaline leaching agreed well with the chemical reaction control model.There is a good linear relationship between the logarithm of the apparent reaction rate constants ln kc and ln kb versus T-1,for the acid leaching mixed control model and the alkaline leaching chemical reaction control model,respectively.In this paper,the kinetic rate equations of acid leaching process and alkali leaching process are also obtained.The results of this study can be used to guide the production of aluminum and silicon leaching from industrial coal gangue.关键词
富高岭石结构/煤矸石/Al/Si/浸出/动力学/活化能Key words
kaolinite-rich structure/coal gangue/Al/Si/leaching/kinetics/activation energy分类
矿业与冶金引用本文复制引用
汪洋洋,姚隆帆,戴露霏,李忠,孟凡会..富高岭石煤矸石中铝和硅的浸出及动力学研究[J].硅酸盐通报,2025,44(1):202-211,10.基金项目
山西省重点研发计划(202102090301026) （202102090301026）
