硫化砷渣的碱性浸出及浸出动力学-中南大学学报.PDF

第 39 卷第 2 期 中南大学学报自然科学版( ) Vol.39 No.2 2008 年 4 月 J. Cent. South Univ. (Science and Technology) Apr. 2008 硫化砷渣的碱性浸出及浸出动力学 白 猛，郑雅杰，刘万宇，张传福 ( 中南大学 冶金科学与工程学院，湖南 长沙，410083) 摘 要：采用氢氧化钠溶液浸出硫化砷渣，使 As 与 Cu 和 Bi 等金属有效分离，有利于硫化砷渣的综合利用。对 氢氧化钠浸出硫化砷渣动力学进行探讨。研究结果表明：当反应温度为 90 ℃，固液比为 1׃6，反应时间为 1.5 h， NaOH 与 As2S3 的摩尔比为 7.2׃1 时，氢氧化钠浸出硫化砷渣，砷浸出率达到 95.90%，铜浸出率仅为 0.087%；经 过氢氧化钠浸出，渣中 Cu 和 Bi 质量分数分别从 10.90%和 1.85%增加到 50.00%和 10.63%，Cu 和 Bi 得到高度富 集；溶液中 As S 与 NaOH 反应为收缩未反应芯扩散控制，其表观活化能为 3.682 kJ/mol 。 2 3 关键词：硫化砷渣；氢氧化钠；浸出；动力学 中图分类号：X705 文献标识码：A 文章编号：1672-7207(2008)02−0268−05 Alkaline leaching and leaching kinetics of arsenic sulfide residue BAI Meng, ZHENG Ya-jie, LIU Wan-yu, ZHANG Chuan-fu (School of Metallurgical Science and Technology, Central South University, Changsha 410083, China) Abstract: In order to utilize arsenic sulfide residue from sulfide precipitation of contained arsenic wasted water, As was separated effectively from Cu and Bi after arsenic sulfide was leached in the sodium hydroxide solution. The leaching kinetics was studied. The results show that the leaching rate of As is up to 95.90% and the copper leaching rate is only 0.087% when the reaction temperature is 90 ℃ , the ratio of solid to liquid is 1:6, the reaction time is 1.5 h, the mole ratio of NaOH to As S is 7.2:1. The mass fractions of Cu and Bi in the leached slag increase from 10.90% and 1.85% to 50.00% 2 3 and 10.63%, respectively. Cu and Bi are highly concentrated. The reaction between NaOH and As S in the solution is