氢气选择性还原铁-钴二元氯化物  

Selective hydrogen reduction of binary iron-cobalt chlorides

作　　者：李浩 郭学益 施尧 王超 于大伟 田庆华 LI Hao;GUO Xue-yi;SHI Yao;WANG Chao;YU Da-wei;TIAN Qing-hua(School of Metallurgy and Environment,Central South University,Changsha 410083,China.;National and Regional Joint Engineering Research Center of Nonferrous Metal Resource Recycling,Changsha 410083,China)

机构地区：[1]School of Metallurgy and Environment,Central South University,Changsha 410083,China. [2]National and Regional Joint Engineering Research Center of Nonferrous Metal Resource Recycling,Changsha 410083,China

出　　处：《Journal of Central South University》2023年第12期3991-4003,共13页中南大学学报（英文版）

基　　金：Project(52274413)supported by the National Natural Science Foundation of China;Project(2021JJ30854)supported by the Hunan Natural Science Foundation,China。

摘　　要：随着锂离子电池在储能领域的广泛应用,对钴资源的需求不断激增。钴白合金作为从含钴矿物中提取金属钴的重要中间产品,为了实现其中有价金属的分离与提取,本文提出了氢氯化焙烧-氢还原的处理工艺,该工艺具有原料适应性强的优点。氢氯化焙烧过程实现了钴白合金中铜、硅的高效分离,并生成了铁钴二元氯化物。为分离铁钴二元氯化物中的有价金属,本文重点研究了其氢气还原过程,包括还原反应的热力学分析、还原温度、还原时间和氢气浓度对还原过程选择性的影响。还原产物包括具有较大比表面积的微纤维状富钴合金和氯化亚铁,其中富钴合金的钴/铁质量比最大为10.71。同时还提出了一种基于化学气相沉积(CVD)的反应机制来解释微纤维状富钴合金的形成。Global demand for cobalt is proliferating with the booming usage and consumption of Li-ion batteries in energy storage applications.With high cobalt content,cobalt white alloy has been an important intermediate product for cobalt production.In this paper,a method of hydrochlorination roasting-hydrogen reduction of cobalt white alloy is proposed to separate the valuable metals in cobalt white alloy.The hydrochlorination roasting process achieves the separation of copper and silicon from the cobalt white alloy and produces iron-cobalt binary chloride.This paper focuses on the effects of reduction temperature,reduction time,and hydrogen concentration during the hydrogen reduction of iron-cobalt binary chloride,with the aim of separating the two metals.The Co/Fe mass ratio in the reduction product is 10.71,with the cobalt content usually above 90 wt%under optimal conditions.The reduction product is a micro-fibrous Co-rich alloy exhibiting a significant specific surface area,which may have promising applications in catalysis.A mechanism based on chemical vapor deposition has been proposed to explain the formation of micro-fibrous products.

关 键 词：钴白合金 氢气还原 选择性分离 纤维状金属钴 

分 类 号：TF816[冶金工程—有色金属冶金]