污酸两段硫化除砷工艺  

Arsenic removal from waste acid by two-stage sulfurization

作　　者：蔡晨龙 杨应宝 陈全坤 杨庆飞 沈强华[1] CAI Chenlong;YANG Yingbao;CHEN Quankun;YANG Qingfei;SHEN Qianghua(College of Metallurgy and Energy,Kunming University of Science and Technology,Kunming 650093,China;Yimen Copper Co.,Ltd.,Yuxi 651100,China)

机构地区：[1]昆明理工大学冶金与能源学院,昆明650093 [2]易门铜业有限公司,云南玉溪651100

出　　处：《有色金属科学与工程》2019年第4期22-27,共6页Nonferrous Metals Science and Engineering

基　　金：校企合作项目（2019FW4）

摘　　要：为了处理污酸中的砷,研究利用硫化钡作为除砷剂,采取了一段间接-二段直接的两段硫化工艺,实验结果表明:一段工艺中投2.4倍计算量的硫化钡,50℃下反应80min;二段工艺中投1.6倍计算量的硫化钡,在室温下反应60min,污酸中砷的浓度从8810mg/L降至0.5mg/L以下,综合除砷率99.99%以上.通过正交实验确定污酸除砷影响因素中硫化钡投药量的影响最大,其次是反应温度和反应时间.此工艺产生的硫化渣量较小,可大大降低企业堆存压力,并且可将产生的硫酸钡二次利用,减小企业生产成本,同时二段除砷后液中未引入新的杂质离子,降低了后续处理工艺的要求.In order to treat arsenic in waste acid,barium sulfide was used as arsenic removal agent.Indirection vulcanization and direct vulcanization were adopted to treat arsenic in waste acid successively.In the first stage of the process,waste acid reacted for 80 minutes at 50℃when dosage of barium sulfide was 2.4 times of the theoretical calculations.In the second stage of the process,waste acid reacted for 60 minutes at 25℃when barium sulfide was 1.6 times of the theoretical calculations.The result showed that the concentration of arsenic in waste acid decreased from 8 810 mg/L to less than 0.5 mg/L,achieving a comprehensive arsenic removal rate of 99.99%.Orthogonal experiment indicated that the dosage of barium sulfide was the most important factor affecting the removal of arsenic from waste acid,followed by reaction temperature and reaction time.The amount of sulfur slag produced in this process was small,which could greatly reduce the stacking pressure of the enterprises.And the barium sulfide generated in the process could be reused to reduce the production cost of the enterprises.At the same time,no new impure ions were introduced into the liquid after the second stage of arsenic removal,which reduced the subsequent treatment process.

关 键 词：硫化钡 硫化法 污酸 砷 两段工艺 

分 类 号：TF111.31[冶金工程—冶金物理化学]