摘要
本文以云南某锌湿法冶炼厂锌浸出渣为研究对象,通过化学多元素分析、MLA、扫描电镜等测试分析方法,对该冶炼渣的化学组成、矿物成分、主要矿物的解离度特征、共生关系、粒度分布及银矿物的赋存状态等工艺矿物学性质进行了详细研究.研究结果表明,该锌浸出渣含银280 g/t,矿物组成以锌赤铁矿为主,主要金属矿物单体解离度差且粒度细小.结合原矿的性质,通过"一粗两精两扫结合中矿再选"的闭路浮选流程,获得了Ag品位6 096.26 g/t,Ag回收率75.22％的银精矿,实现了对该锌浸出渣中银矿物的有效回收.
Abstract
The zinc ore leaching tailing obtained from a zinc hydrometallurgical plant in Yunnan Province,China has been selected as a research object in this paper.Various analytical techniques,including chemical multi-element analysis,MLA,and scanning electron microscopy,have been employed to comprehensively study the chemical composition,mineralogical composition,dissociation characteristics of major minerals,symbiotic relationship,particle size distribution,and occurrence state of silver minerals of the leaching tailing.The research findings reveal that the zinc leaching tailing contains 280 g/t of silver,and main mineral of zinc-hematite.Moreover,the major metallic minerals are characterized with limited individual dissociation and fine particle size distribution.Considering properties of the original zinc ore,a closed-circuit flotation process incorporated with one-stage roughing,two-stage scavenging,and two-stage cleaning has been implemented to treat the zinc ore leaching tailing.As the resulte,a silver concentrate with an impressive silver grade of 6 096.26 g/t at a silver recovery rate of 75.22％has been obtained.This demonstrates an effective method for recovering silver minerals from the zinc ore leaching tailing.
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