摘要
冶炼烟气制酸行业的废酸中通常含有一定量的金属离子及毒性较高的砷离子,分步硫化法可对其中的Cu^2+和As^3+进行分步回收。针对质量分数为0~15%的铜、砷酸性废水,对分步硫化沉淀金属离子的过程进行了理论计算和分析;同时对酸性废水中加入硫化剂避免产生硫磺的pH范围也进行了理论计算,绘出了Cu—S—H2O酸性体系生成硫磺pH与lg[Cu^2+]的关系曲线图。相关的验证性实验证明,理论计算结果与实验结果较为吻合,废酸质量分数(0~15%)对第一步硫化中铜离子去除率的影响较小,第一步硫化时硫化剂用量达到去除铜离子理论需求量的1.0倍时,铜离子的去除率可以超过99%;第二步硫化时硫化剂用量达到去除砷离子理论需求量的1.0倍时,砷离子的去除率可以超过96%.
The waste acid in acid plant industry by smelting flue gas usually contains a certain amount of metal ions and arsenic ions with higher toxicity.The sulfidation method can remove Cu^2+and As^3+therein step by step.In this paper,theoretical calculations and analysis of the process were carried oud,in which step-by-step sulfidation is conducted towards the metal ions in acidic wastewater containing copper and arsenic with an acidity of 0-15%.At the same time,theoretical calculations were also carried out on the pH range of the acid waste water with the addition of a sulfiding agent to avoid the generation of sulfur.The relevant confirmatory experiments proved that the theoretical calculation results are in good agreement with the experimental results.The acidity of the waste water(0-15%)has little effect on the removal of copper ions in first sulfidation.When the amount of sulfiding agent in first sulfidation reaches 1.0 times the theoretical demand for removing copper ions,the removal rate of copper ions reaches over 99%.In second sulfidation,when the amount of sulfiding agent reaches 1.0 times the theoretical demand for removing arsenic ions,the removal rate of arsenic ions reaches over 96%.
作者
乔冉冉
李一兵
张忠林
段东红
周娴娴
李瑜
郝晓刚
刘世斌
QIAO Ranran;LI Yibing;ZHANG Zhonglin;DUAN Donghong;ZHOU Xianxian;LI Yu;HAO Xiaogang;LIU Shibin(College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China)
出处
《太原理工大学学报》
CAS
北大核心
2020年第5期676-682,共7页
Journal of Taiyuan University of Technology
基金
河南中原黄金冶炼厂有限责任公司资助项目。
关键词
废硫酸
铜离子
砷离子
去除
分步硫化
waste sulfuric acid
copper ion
arsenic ion
removal
stepwise sulfidation
