湿法炼锌有机物净化钴渣中钴的回收工艺研究  

Process for recovering cobalt from organically cobalt residue in zinc hydrometallurgy

作　　者：熊甲成 李存兄[1] 张利波[1] 夏力 吉文斌 林晓坦 XIONG Jia-cheng;LI Cun-xiong;ZHANG Li-bo;XIA Li;JI Wen-bin;LIN Xiao-tan(College of Metallurgy and Energy Engineering of Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650093

出　　处：《中国有色冶金》2022年第1期15-22,共8页China Nonferrous Metallurgy

摘　　要：湿法炼锌净化过程产出的有机物净化钴渣的产量逐年增加,钴渣中钴主要以有机螯合物状态存在,难溶于水和稀酸,因此采用常规浸出方法钴的浸出率很低。本文针对该钴渣特点提出低酸浸出-煅烧-还原浸出-氧化沉钴工艺回收有机物净化钴渣中钴的方法。该工艺有两个创新点,一是采用煅烧工艺破坏有机物钴渣中的有机成分,将其转变为易回收的CoO和CoSO_(4);二是在氧化沉钴工序,采用H_(2)O_(2)作为氧化剂替代常规的Na_(2)S_(2)O_(8)进行氧化沉钴,以解决氧化剂消耗量大和沉钴后液处理繁琐等问题。在各段工序的较优工艺参数条件下,采用该工艺得到的钴富集物氢氧化高钴(Co(OH)_(3))含钴51.74%,全流程钴富集比达到9.5倍,钴综合回收率达到87.42%,实现了湿法炼锌有机物净化钴渣中钴的高效分离与回收。The output of organically cobalt residue produced in the purification procedure in zinc hydrometallurgy is increasing year by year.Cobalt in the cobalt residue mainly exists in the state of organic chelate compound,which is insoluble in water and dilute acid.Therefore,the leaching rate of cobalt by conventional leaching method is very low.In line with the characteristics of such cobalt residue,this article comes up with a method of recovering cobalt from organically purified cobalt residue by employing a process comprising low-acidity leaching—calcining—reductive leaching—oxidizing cobalt precipitation.This process involves two innovation points.First,the calcination process is employed to destroy the organic components in the organic cobalt residue and convert it into easily recoverable CoO and CoSO_(4);Second,in the cobalt oxide precipitation procedure,H_(2)O_(2) is used as oxidizing agent instead of conventional Na_(2)S_(2)O_(8) for oxidizing cobalt precipitation,to avoid a large consumption of oxidizing agent and cumbersome treatment of post cobalt precipitation liquor among other issues.Under the optimal process parameters of each procedure,the cobalt enrichment cobalt(Ⅲ)hydroxide(Co(OH)_(3))obtained by this process contains 51.74% of cobalt,the cobalt enrichment ratio of the whole process is up to 9.5 times,and the comprehensive cobalt recovery is up to 87.42%,fulfilling the high-efficiency separation and recovery of cobalt from the organically cobalt residue in zinc hydrometallurgy.

关 键 词：湿法炼锌 有机物净化钴渣 钴回收率 氢氧化高钴 煅烧工艺 H_(2)O_(2)氧化剂 

分 类 号：TF813[冶金工程—有色金属冶金] TF816