从硫化砷渣中回收三氧化二砷的双氧水氧化工艺研究  

Study on Hydrogen Peroxide Oxidation Process of Recovering Arsenic Trioxide from Arsenic Sulfide Residue

作　　者：王雷 张桧楠 WANG Lei;ZHANG Hui-nan

机构地区：[1]山东恒邦冶炼股份有限公司,山东烟台264109

出　　处：《有色冶金节能》2022年第2期6-9,共4页Energy Saving of Nonferrous Metallurgy

基　　金：国家重点研发计划项目——铜冶炼重金属危废源头减量及全过程控制集成示范(2018YFC1900302)。

摘　　要：含砷酸性废水经硫化法处理产生的硫化砷渣含砷量高,属于典型危废。本文采用双氧水氧化处理硫化砷渣,得到富砷液和硫磺渣,富砷液经二氧化硫还原得到三氧化二砷产品。通过氧化浸出过程试验,得到最佳反应条件:硫酸加入量、工业级双氧水用量分别为硫化砷渣量的10%和30%、液固比为1∶1,催化剂加入量为硫化砷渣量的0.1%、温度85℃、反应时间2 h。在此条件下,砷的脱除率可达93%以上,富砷液还原后得到的三氧化二砷产品符合国标GB 26721—2011中As_(2)O_(3)-1的要求。Arsenic sulfide residue produced from sulfidization of As-containing acidic wastewater contains a high As content,categorized as typical hazardous waste.In this paper,the hydrogen peroxide oxidation process was adopted to treat arsenic sulfide residue and produce sulfur residue and As-rich solution that is reduced by sulfur dioxide to generate the arsenic trioxide product.Optimal reaction conditions were obtained through tests on oxidation leaching process.The dosages of sulfuric acid,industrial grade hydrogen peroxide and catalyst should be 10%,30%and 0.1%of the amount of arsenic sulfide residue respectively.The liquid-solid ratio should be 1∶1,temperature should be at 85℃and reaction duration should be 2 h.Under such conditions,the As removal rate can exceed 93%,and the arsenic trioxide product obtained from reduction of As-rich solution is up to the As_(2)O_(3)-1 requirements stipulated in GB 26721—2011.

关 键 词：含砷酸性废水 硫化法 危险废物 硫化砷渣 双氧水氧化法 三氧化二砷 

分 类 号：X758[环境科学与工程—环境工程]