摘要
采用硫酸与硫酸铵混合溶液酸浸处理铝电解废阴极碳块,研究了硫酸与硫酸铵物质的量比、液固比、浸出温度、浸出时间等参数对废阴极碳块中冰晶石浸出率的影响。结果表明,在浸出温度70℃、液固比8 mL/g、硫酸与硫酸铵物质的量比4、浸出时间120 min的优化条件下,冰晶石浸出率达99.48%;浸出渣主要由炭和氟化钙组成,无浸出毒性,为一般固体废弃物。
The spent cathode carbon block after aluminum electrolysis was treated by acid leaching with a mixed solution of sulfuric acid and ammonium sulfate,and the effects of factors,such as molar ratio of sulfuric acid to ammonium sulfate,liquid⁃solid ratio,leaching temperature and time,on the leaching rate of cryolite from this spent cathode carbon sulfate were investigated.The results show that at a leaching temperature of 70℃,with liquid⁃solid ratio of 8 mL/g,sulfuric acid and ammonium sulfate in a molar ratio of 4,a 120⁃min leaching process can lead to the leaching rate of cryolite up to 99.48%.The leaching residue,being composed of carbon and calcium fluoride and free of leaching toxicity,can be treated as a general solid waste.
作者
雷占丽
桓莹
祁玉刚
袁富鑫
LEI Zhanli;HUAN Ying;QI Yugang;YUAN Fuxin(Xining Ecology and Environment Bureau,Xining 810008,Qinghai,China)
出处
《矿冶工程》
CAS
北大核心
2023年第3期137-139,共3页
Mining and Metallurgical Engineering
关键词
铝电解
废阴极碳块
酸浸
冰晶石
aluminum electrolysis
spent cathode carbon block
acid leaching
cryolite
作者简介
雷占丽(1984-),女,青海人,工程师,主要从事工业污染防治、工业固废利用及管理工作。
