采用Na2SO3溶液从硒渣中选择性浸出Se及其动力学.pdf

第22卷第2期
中国有色金属学报
012年2月
The Chinese Journal of Nonferrous Metals
Feb.2012
文章编号:1004-0609(2012)02-0585-07
采用Na2SO3溶液从硒渣中选择性浸出Se及其动力学
郑雅杰,陈昆
(中南大学治金科学与工程学院,长沙410083
摘要:采用SO2还原沉金后液制得硒渣,再用Na2SO3选择性浸出硒渣,使Se得到有效分离;通过研究浸出过
程中Se浸出率随时间的变化,建立该反应的动力学方程,确定Na2SO3溶液浓度、液固比、搅拌速度及反应温度
对Se浸出率的影响,并计算相应的表观活化能。结果表明:增加Na2SO2溶液浓度和升高反应温度可以较大幅度
提高Se的浸出率,液固比和搅拌速度对浸出Se的影响较小;Na2SO3浸出Se过程为 Avrami模型混合控制,其特
征参数n和表观活化能E分别为0.235和20.847 KJ/mol,Se的浸出率受反应温度的影响较大。
关鍵词:硒;硒渣;亚硫酸钠;选择性浸出;动力学
中图分类号:TF843.5:TF803.2
文献标志码:A
Selective leaching Se from selenium residue b
Na2s03 solutions and leaching kinetics
ZHENG Ya-jie, CHEN Kun-kun
(School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China
Abstract: Selenium was effectively separated from selenium residue. The selenium residue was prepared from the
solution after precipitating gold by SO reduction, followed by Na2s03 selective leaching. The effects of Na2s03
concentration, liquid and solid ratio, stirring speed and reaction temperature on Se extraction were confirmed with the
change of Se leaching ratio during the leaching process of Se by Na SO The kinetics equation was established and the
corresponding apparent activation energy was calculated. The results indicate that Se leaching ratio increases greatly with
increasing Na2 S0 concentration and reaction temperature. The liquid and solid rate and stirring speed have little
influence on Se extraction. The kinetics of leaching Se from selenium residue follows the Avrami model and the leaching
process is hybrid controlled. The apparent activation energy of leaching Se and the feature parameter of Avrami equation
are determined to be 20. 847 k/mol and 0.235, respectively. The reaction temperature has great influence on Se leaching
rate
Key words: selenium; selenium residue; sodium sulfite; selective leaching; kinetics
硒是稀散金属,不仅广泛应用于电子、玻璃、陶过程中,硒主要富集于烟尘、电解过程产生的阳极泥
瓷、化工、治金、农业、食品、卫生和环保等行业
和制硫酸过程产生的酸泥中山。提取硒的主要原料是
而且具有重要的药用价值,是一种强抗氧化剂,为人铜电解的阳极泥,目前冶炼厂主要采用硫酸化焙烧
类和动物生存必需的微量元素。硒主要共生于铜矿、蒸馏一还原工艺回收硒2,该工艺流程短、成本低、
铜铁矿、铜镍矿、铜铅锌矿、铅锌矿、黄铁矿、硫磺硒回收率高,充分利用了烟气中的SO2,有利于废气
矿和部分含硒金矿等,在这些矿物的火法和湿法治金综合利用,但对系统密封性要求高。对于湿法回收硒,
基金项目:广东省教育部产学研重大项目(2008A090300016)
收稿日期:2011-01-20:修订日期:2011-06-15
通信作者:郑雅杰,教授,博士;电话:0731-8836285:E-mai:zzyyij0]e@yahoo.com,cn