氨浸法从含砷石灰铁盐渣中回收锌的动力学研究  

Kinetics Research on the Recovery of Zinc from Solid Waste Containing Arsenic by Ammonia Leaching Method

作　　者：杜冬云[1] 倪冲[1] 赵燕鹏[1] 阮福辉[1] 卢娜[1] 

机构地区：[1]中南民族大学环境科学与工程研究所化学与材料科学学院/催化材料科学国家民委-教育部共建重点实验室,武汉430074

出　　处：《中南民族大学学报（自然科学版）》2012年第4期6-10,共5页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：武汉市重点科技攻关资助项目(201160638173)

摘　　要：采用氨浸法回收含砷石灰铁盐渣中锌,研究了不同浸取剂、浸取剂的组成、总氨浓度、氨水与铵盐配比、液固比等工艺条件对锌浸出效果的影响,分析了锌的浸出动力学.结果表明:以氨水和碳酸铵组成的浸取体系为浸取剂,当总氨浓度为5 mol/L,氨-铵盐摩尔浓度比为2∶3,液固比为4∶1时,锌的浸出率为56.21%.由宏观模型得出锌的浸出在温度为288～323 K内遵循"未反应核缩减"模型,受内扩散控制,浸出动力学方程为:1-2α3-(1-α)2/3=232×exp(-32245/RT)t,浸出表观活化能为32.24 kJ/mol.Zinc from solid waste containing arsenic was recovered by ammonia leaching method. The effects of different leachant, leachant composition, total ammonia concentration, molar concentration ratio of NH3 to NH4＋ , liquid-solid ratio on zinc leaching were investigated and its kinetics of was also analyzed. The results indicated that 56.21% of zinc was recovered when c（ammonia） = 5 mol/L, c （ NH3 ） ： c （ NH4＋ ） = 2： 3, L/S ratio = 4： 1. And the leaching process by macro model followed the shrinking-core model at the temperature ranging from 288 K to 328 K, which was controlled by the inner ~ - 32245, diffusion of reactants. The leaching kinetics equation was established as 1-2α3-（1-α）2/3=232×exp（-32245/RT）t, and the apparent activation energy is 32.24 kJ/mol.

关 键 词：含砷石灰铁盐渣 氨浸法 浸出动力学 锌 

分 类 号：X758[环境科学与工程—环境工程]