摘要
开展硫化锌精矿还原浸出高铁锌浸出渣高效浸铟及浸出液中铟选择性分离的研究。结果表明:在固体物料粒度74~105μm、反应温度90℃、浸出时间300 min、硫酸浓度1.4 mol/L的条件下,铟的浸出率达95%以上。采用收缩核模型对还原浸出动力学进行分析,不同条件下的浸出实验结果表明反应受穿过固体产物层的扩散控制,活化能为17.96 k J/mol,相对于硫酸浓度的反应级数为2.41。铁粉置换沉铜过程铜和砷的沉淀率均达99%以上。98%以上的铟从含高亚铁离子浓度的硫酸锌溶液中选择性分离,获得铟含量约为2.4%的富铟渣,经酸浸-萃取-电积工艺流程进一步处理后可得到纯铟。
Reductive leaching of high-iron bearing zinc leaching residue(HIZLR)by zinc sulfide concentrate to extract indium and its further selective separation from the leachate were studied.The results indicated that over 95%of indium extraction was achieved at particle sizes of 74-105μm,reaction temperature of 90℃,leaching time of 300 min and sulfuric acid concentration of 1.4 mol/L.The leaching kinetics was analyzed by the shrinking core model,and the leaching data from various experimental conditions indicated that the reactions were controlled by the diffusion through the solid product layer with an activation energy of 17.96 k J/mol.The order of the reaction with respect to the sulfuric acid concentration was determined to be 2.41.Over 99%of copper and arsenic were coprecipitated in the cementation of copper with iron powder.More than 98%of indium was selectively separated from zinc sulfate solution with high ferrous ion content,and the indium-rich precipitate,which had an indium content of approximately 2.4%,could be further treated by the acid leaching-solvent extraction-electrowinning process to produce pure indium.
作者
李存兄
张兆闫
张耀阳
邓志敢
吉文斌
林晓坦
Cun-xiong LI;Zhao-yan ZHANG;Yao-yang ZHANG;Zhi-gan DENG;Wen-bin JI;Xiao-tan LIN(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China)
基金
the financial supports from the National Key Research and Development Plan of China(No.2021YFC2902801)
the National Natural Science Foundation of China(Nos.52064034,51664038)。
关键词
还原浸出
高铁锌浸出渣
硫化锌精矿
动力学
铟沉淀
reductive leaching
high iron zinc leaching residue
zinc sulfide concentrate
kinetics
indium precipitation
