湿法冶金2025，Vol.44Issue(6)：783-790,8.DOI:10.13355/j.cnki.sfyj.2025.06.010
相变转化焙烧—水浸资源化回收铝电解炭渣试验研究
Resource Recovery of Aluminum Electrolysis Spent Carbon Anode by Phase Transformation Roasting—Water Leaching Process
摘要
Abstract
Extracting fluorine from aluminium electrolysis spent carbon anode by phase transformation roasting—water leaching process was studied.The effects of various factors during phase transformation roasting and water leaching on fluoride leaching rate were investigated.The results indicate that under the optimal conditions of alkali fusion temperature of 700 ℃,alkali fusion time of 2 h,alkali-to-material mass ratio of 1.25,insoluble cryolite is transformed into soluble sodium fluoride and sodium meta-aluminate phases.Under the optimal conditions of water leaching temperature of 65 ℃,liquid volume to solid mass ratio of 22/1,water leaching time of 2 h,the fluorine leaching rate achieve 95.86％.XRD analysis of the leached residue reveal that the remaining fluoride existed as calcium fluoride.The soluble fluorine mass concentration in the residue is 48 mg/L,which can meet the harmless requirements.The harmless and resourceful recovery of carbon residue can be achieved by converting the fluoride occurrence form through calcination and combining it with a one-step water leaching process.The method offers advantages such as a simple process flow,rapid reaction kinetics,high treatment efficiency,and promising industrial application prospects.关键词
炭渣/铝电解/氟/提取/相转化/焙烧/水浸/无害化Key words
spent carbon anode/aluminum electrolysis/fluorine/extraction/phase transformation/roasting/water leaching/harmless分类
矿业与冶金引用本文复制引用
盛双,马路通,林艳..相变转化焙烧—水浸资源化回收铝电解炭渣试验研究[J].湿法冶金,2025,44(6):783-790,8.基金项目
云南省科技计划工业高新技术专项(202203AA080007). （202203AA080007）
