中南大学学报（自然科学版）2025，Vol.56Issue(8)：3126-3138,13.DOI:10.11817/j.issn.1672-7207.2025.08.004
粉煤灰细磨预处理—钠化焙烧—酸浸提取稀散元素工艺及机理研究
Process and mechanism study of fine grinding pretreatment—sodium roasting—acid leaching extraction of rare metal elements from fly ash
摘要
Abstract
The comprehensive extraction of rare metal elements from fly ash was explored,which served as both a significant solid waste and a valuable secondary resource containing various trace metals.A novel process comprising fine grinding pretreatment,sodium roasting,and hydrochloric acid leaching was introduced,and the optimization of its parameters was investigated.The results show that after a 15 min fine grinding step,the amount of sodium carbonate is 37.5％of the raw material mass.After roasting at 850 ℃ for 2 h,the subsequent leaching with 3 mol/L hydrochloric acid at 80 ℃ with a liquid-to-solid ratio of 10 mL/g for 90 min,leads to leaching efficiencies of 89.98％,86.74％,and 83.27％for Li,Ga and V,respectively.The sodium carbonate facilitates the transformation of insoluble mineral phases,such as glass microspheres,mullite and quartz into soluble feldspathoid and sodium metasilicate during the roasting process,thereby releasing the trace metals from the fly ash.关键词
粉煤灰/焙烧活化/酸浸/综合提取/稀散金属Key words
fly ash/roasting activation/acid leaching/comprehensive extraction/rare metals分类
资源环境引用本文复制引用
尉子夜,朱德庆,潘建,杨聪聪,郭正启,李思唯..粉煤灰细磨预处理—钠化焙烧—酸浸提取稀散元素工艺及机理研究[J].中南大学学报（自然科学版）,2025,56(8):3126-3138,13.基金项目
国家重点研发计划项目(2023YFC3903904)(Project(2023YFC3903904)supported by the National Key Research and Development Program of China) （2023YFC3903904）
