硫化砷渣的碱性浸出及浸出动力学  

Alkaline leaching and leaching kinetics of arsenic sulfide residue

作　　者：白猛[1] 郑雅杰[1] 刘万宇[1] 张传福[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2008年第2期268-272,共5页Journal of Central South University:Science and Technology

基　　金：广东省创新基金资助项目(200501045)

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1.5h,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As2S3与NaOH反应为收缩未反应芯扩散控制,其表观活化能为3.682kJ/mol。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 As2S3 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% and 10.63%, respectively. Cu and Bi arc highly concentrated. The reaction between NaOH and As2S3 in the solution is controlled by diffusion and the reaction is applicable to the shrinking core model. The active energy is 3.682 kJ/mol.

关 键 词：硫化砷渣 氢氧化钠 浸出 动力学 

分 类 号：X705[环境科学与工程—环境工程]