摘要
以铜转炉烟尘为原料,采用高压酸浸工艺回收有价金属和脱除砷。结果表明,在硫酸浓度4 mol/L、浸出温度100℃、浸出时间2 h条件下,烟尘中砷、铁和铜浸出率分别为94.14%、93.80%、91.80%,浸出渣主要物相为硫酸铅(PbSO_(4));通过氧压沉砷处理浸出液,使溶液中铁和砷形成臭葱石(FeAsO_(4)·2H_(2)O)而固化;沉砷后液主要物质为Cu^(2+)和SO_(4)^(2-),可用于电解回收铜。该工艺可以实现铜烟尘中有价金属的综合回收,同时将砷以臭葱石形式固化,减少对环境的污染。
With the converter dust as the raw material,a high⁃pressure acid leaching process was adopted to recover the valuable metals therein while removing arsenic.The results show that the leaching rates of arsenic,iron and copper reach 94.14%,93.80%and 91.80%,respectively,and the main phase in the leach residue is lead sulfate(PbSO_(4)),after 2 h⁃leaching process at 100℃with sulfuric acid concentration of 4 mol/L.The leaching solution is treated with oxygen pressure for arsenic precipitation,leading to the arsenic combined with the iron in the solution to form scorodite(FeAsO_(4)·2H_(2)O).The main substances in the solution after arsenic precipitation are Cu^(2+)and SO_(4)^(2-),which can be subjected to electrolytic process for copper recovery.By adopting this technical process,the valuable metals in copper dust can be comprehensively recovered,while the arsenic therein can be solidified in the form of scorodite,thus reducing environmental pollution.
作者
牛建军
NIU Jian-jun(Shanxi Provincial Ecological Environment Monitoring and Emergency Response Center(Shanxi Provincial Institute of Ecological Environment Sciences),Taiyuan 030027,Shanxi,China)
出处
《矿冶工程》
CAS
CSCD
北大核心
2022年第3期118-120,124,共4页
Mining and Metallurgical Engineering
关键词
铜烟尘
高压浸出
砷
铁
铜
沉砷
copper dust
high pressure leaching
arsenic
iron
copper
arsenic precipitation
