赞比亚某铜钴矿金属回收试验研究

赞比亚地区铜钴矿资源品位较低,铜钴赋存状态复杂,浸出和回收技术不成熟。某冶炼厂对此地区铜钴矿采用"浸出-萃取-净化-沉钴"工艺生产粗制氢氧化钴,浸出工段在生产过程中水量过剩,在净化工段前,萃余液中钴难以富集,造成资源浪费。本文采用酸浸还原-Lix984萃取-HBL110萃取工艺对此铜钴矿进行了试验,取得了满意效果:采用还原剂双氧水与亚硫酸钠联合法进行酸浸还原,钴、铜浸出率分别为98.27%、98.59%;采用萃取剂Lix984萃取回收铜,三级逆流萃取铜萃取率为99.13%,钴的萃取率为7.12%,实现了铜和钴分离的目的;萃铜后的萃余液主要含Co和Fe,采用双氧水对萃余液预处理,再采用萃取剂HBL110萃取钴,钴的萃取率达到99%以上,除铁率也从64.37%提升至86.15%。

Experimental study on metal recovery from copper-cobalt ore in Zambia

The grade of copper-cobalt ore in Zambia is low,the occurrence of copper and cobalt is complex,and the leaching and recovery technology is immature.A smelter uses the"leaching-extraction-purification-cobalt precipitation"process to produce crude cobalt hydroxide from the copper-cobalt ore.In the leaching section,there is excess water in the production process,and before the purification section,the cobalt in the raffinate is difficult to concentrate,resulting in a waste of resources.This article uses acid leaching reduction-Lix984 extraction-HBL110 extraction process to test this copper-cobalt ore and has achieved satisfactory results.Using the reducing agent hydrogen peroxide and sodium sulfite combined method for acid leaching reduction,the leaching rates of cobalt and copper were 98.27%and 98.59%respectively.The copper is extracted and recovered with the extractant Lix984,and the three-stage countercurrent extraction copper extraction rate is 99.13%,and the cobalt extraction rate is7.12%,achieving the purpose of separating copper and cobalt.The raffinate after copper extraction mainly contains Co and Fe,and the raffinate is pretreated with hydrogen peroxide,and then cobalt is extracted with the extractant HBL110.The extraction rate of cobalt reaches more than 99%,and the iron removal rate is also greatly improved.