盐酸浸出焙烧金精矿动力学研究  

A Study on Kinetics of Roasted Gold Concentrate Leaching by Hydrochloric Acid

作　　者：师兆忠 刘进[2,3] 王丽 娄童芳 SHI Zhaozhong;LIU Jin;WANG Li;LOU Tongfang(Henan Provincial Key Laboratory for Advanced Silicon Carbide Materials,Kaifeng,Henan 475004,China;Kaifeng Key Laboratory of Clean Production Technology of Chemical Industry,Kaifeng,Henan 475004,China;School of Material and Chemical Engineering,Kaifeng University,Kaifeng,Henan 475004,China)

机构地区：[1]河南省先进碳化硅材料重点实验室,河南开封475004 [2]开封市化工清洁生产技术重点实验室,河南开封475004 [3]开封大学材料与化学工程学院,河南开封475004

出　　处：《昆明理工大学学报（自然科学版）》2019年第5期27-32,共6页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：河南省科技攻关计划项目(162102210342);河南省高校重点科研项目资助计划项目(18A150037);开封基础前沿研究专项(1908002);开封大学博士基金资助项目(BS2016001)

摘　　要：在盐酸体系中,Fe^3+可以氧化金生成AuCl4^-,利用这一反应,开展了搅拌速率、反应温度、盐酸浓度、液固比和反应时间对盐酸与焙烧金精矿反应浸出金的小型试验研究,同时对浸出条件进行了优化,确定了该反应的动力学模型.获得优化工艺条件为:温度90℃,盐酸浓度8 mol/L,液固比1.5∶1,反应时间90 min,搅拌速度400 r/min,反应温度、盐酸浓度对浸出反应影响显著,优化条件下浸出率高达95.53%;利用动力学方法对实验数据进行拟合,发现该反应属于收缩核模型反应,较好地符合1-(1-x)1/3=k1 t方程,经过数据处理,得到反应表观活化能Ea=13.88 kJ/mol,浓度反应级数为0.61,速率常数0.16.In hydrochloric acid system,gold can be oxidized Fe3+to form AuCl4^-.In laboratory,hydrochloric acid leaching tests on roasted gold concentrate were conducted,and effects of stirring rate,reaction temperature,concentration of hydrochloric acid,liquid-solid ratio and reaction time on gold leaching reaction were studied.The process conditions were optimized and the kinetic model of the reaction was determined.The results show that the optimum leaching conditions are as follows:temperature 90℃,concentration of hydrochloric acid 8 mol/L,ratio of liquid to solid 1.5∶1,reaction time 90 min,stirring rate 400 r/min,reaction temperature and concentration of hydrochloric acid significantly affect leaching reaction.Under the optimized conditions,the leaching rate is up to 95.53%.The kinetic method is used to fit the experimental data.It is found that the reaction belongs to the model of shrinking core,which accords well with the 11-(1-x)1/3=k1 t equation.After data processing,the apparent activation energy of the reaction Ea=13.88 kJ/mol is obtained.The order of concentration reaction and the rate constant are determined to be 0.61 and 0.16 respectively.

关 键 词：焙烧金精矿 浸出 动力学 表观活化能 

分 类 号：TD953[矿业工程—选矿]