金精矿碘化浸出过程动力学  

Leaching dynamics of gold concentrates by iodine-iodide solution

作　　者：李绍英[1,2] 王海霞 袁喜振 赵留成[1,2] 孙春宝[1,2] 

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083 [2]北京科技大学土木与环境工程学院,北京100083 [3]山西中条山工程设计有限公司,运城043700

出　　处：《中国有色金属学报》2014年第3期814-819,共6页The Chinese Journal of Nonferrous Metals

基　　金：高等学校博士学科点专项科研基金项目(20100006110003)

摘　　要：采用碘-碘化物体系对金精矿进行浸出,通过实际矿石的浸出试验考察搅拌速度、浸出温度、碘浓度及碘离子浓度对金精矿碘化浸出反应动力学的影响。结果表明:提高搅拌速度对金的浸出有不利影响;通过对影响该体系动力学参数的考察,发现其符合核收缩模型,反应过程总体由界面化学反应控制,其表观活化能为31.674kJ/mol,碘浓度和碘离子浓度的反应级数分别为1和0.5,建立了金精矿碘化浸出过程的反应速率方程。Gold concentrate was leached by iodine-iodide solution system. The effects of different parameters such as stirring speed, leaching temperature, iodine concentration and iodide concentration on the gold leaching dynamics were investigated. The results show that increasing stirring speed has a negative influence on the gold leaching. Through the study of dynamic parameters of this system, it is found that gold concentrates leaching by iodine-iodide solution is in accordance with the shrinking core model. The overall reaction is controlled by the interfacial chemical reaction with the apparent activation energy of 31.674 kJ/mol. The reaction orders of iodine and iodide concentrations are 1 and 0.5, respectively. The leaching reaction velocity equation of the process is established.

关 键 词：金精矿 碘化浸出 动力学 表观活化能 界面化学反应 

分 类 号：TF111[冶金工程—冶金物理化学]