硫酸(55%)的H_(2)S硫化降砷研究  

Research on Sulfurizing Sulphuric Acid (55%) with H_(2S) for Arsenic Removal

作　　者：刘海弟[1] 蔡兵 马小乐 李伟曼[1] 陈运法[1] 罗永春 LIU Hai-di;CAI Bing;MA Xiao-le;LI Wei-man;CHEN Yun-fa;LUO Yong-chun

机构地区：[1]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [2]昆明理工大学环境科学与工程学院,云南昆明650500 [3]云南锡业股份有限公司铜业分公司,云南蒙自661000 [4]浙江华友钴业股份有限公司,浙江嘉兴314500

出　　处：《有色设备》2023年第2期6-12,共7页Nonferrous Metallurgical Equipment

基　　金：国家重点研发计划(2018YFC0213400);国家重点研发计划(2017YFC0211801);中国科学院重点部署项目(ZDRW-ZS-2017-6-2);中国科学院先导专项A(XDA21040401)。

摘　　要：本文研究了以H_(2)S为硫化剂,对溶解于55%的硫酸中的亚砷酸进行硫化降砷的过程,研究发现H_(2)S可以成功对该浓度硫酸中的亚砷酸实现沉淀,并生成无定型硫砷化合物。经硫化后的硫酸中砷含量从2481.43ppm降低至0.81ppm,该检测结果比H_(2)S硫化降砷理论计算的硫化后砷浓度低两个数量级,其原因很可能在于过量H_(2)S存在时部分As(III)被还原为As(II),从而极大促进As的硫化沉淀,该研究结果证明:即使在55%的高酸度下,H_(2)S仍然可以作为高效硫化剂对硫酸进行纯化除杂,这使含砷硫酸的净化和资源化回用成为可能。The process of sulfurizing the H_3AsO_(3) dissolved in sulphuric acid(55%) with H_(2S) used as sulfidization agent was investigated.It was revealed by the results that H_(2S) could precipitate the arsenious acid in the sulphuric acid successfully and generate amorphous sulfoarsenide.After the sulfidization process,the As content in the sulphuric acid was decreased from 2481.43 ppm to 0.81 ppm which was lower than the As-concentration obtained from theoretical calculation by 2 orders of magnitude.The reason might be that As(III) is reduced into As(II) under excessive H_(2S) which greatly improve the sulphurizing-precipitation of As.It could be concluded that even under the present high H~+ concentration,H_(2S) is still an effective sulfidization agent to treat and purify the sulphuric acid.This made it possible to clean the As-polluted sulphuric acid and recover it as a resource.

关 键 词：硫酸 砷沉淀 硫化 硫化氢 

分 类 号：TF811[冶金工程—有色金属冶金]