摘要
开展含钴三元硫化物常压硫酸浸出的实验研究。考察搅拌速度、浸出温度、硫酸浓度和粒度对钴浸出率的影响,并分析从含钴三元硫化物中浸出钴的动力学。结果表明,在最佳条件下,钴和铁被选择性浸出,且浸出率均大于99%,而钼和铜则富集于浸出渣。通过对实验数据的分析可知,钴的浸出符合由固体产物层产生的收缩核模型,且浸出过程受内扩散控制。浸出反应的活化能为49.86k J/mol,硫酸浓度和粒度的反应级数分别为0.57和-1.4。
The leaching of cobalt from cobalt-bearing ternary sulfide with sulfuric acid solution under atmospheric pressure was investigated.The influence of stirring speed,leaching temperature,H2SO4 concentration,and particle size on the leaching efficiency of cobalt was studied,and the kinetics analysis of cobalt leaching from the cobalt-bearing ternary sulfide was performed.The results showed that cobalt and iron were selectively leached with high efficiency(>99%)under the optimal conditions,while molybdenum and copper were enriched in residues.According to the analysis of the experimental data,the leaching of cobalt conformed to the shrinking core model with a solid product layer and was controlled by internal diffusion.The activation energy of the leaching reaction was 49.86 kJ/mol,and the reaction orders of H_(2)SO_(4) concentration and particle size were 0.57 and-1.4,respectively.
作者
张丁川
孙丰龙
赵中伟
刘旭恒
陈星宇
李江涛
何利华
Ding-chuan ZHANG;Feng-long SUN;Zhong-wei ZHAO;Xu-heng LIU;Xing-yu CHEN;Jiang-tao LI;Li-hua HE(School of Metallurgy and Environment,Central South University,Changsha 410083,China;Key Laboratory for Metallurgy and Material Processing of Rare Metals,Central South University,Changsha 410083,China)
基金
Major Science and Technology Program of Gansu Province,China(No.22ZD6GC017)
National Natural Science Foundation of China(No.92062223)。
关键词
钴白合金
含钴三元硫化物
钴
硫酸
浸出动力学
cobalt white alloy
cobalt-bearing ternary sulfide
cobalt
sulfuric acid
leaching kinetics
