氧气底吹熔炼-液态渣侧吹还原技术处理低铅高银精矿工艺介绍

Process introduction of oxygen bottom blowing smelting-liquid slag side blowing reduction technology for low lead-high silver concentrate

目前国内铅锌伴生银精矿通常采用氧气底吹熔炼-液态渣直接还原工艺进行冶炼,该工艺在处理Pb品位低于30%的精矿时,选择与高品位铅精矿混合处理的方法,但该方法存在炉渣量大、银回收率低的问题。本文针对山西某地区典型的低铅高银精矿特点和已有工业产业布局,计划将铅酸蓄电池铅膏与铅锌伴生银精矿协同处理,并设计了氧气底吹熔炼-液态渣侧吹还原工艺。该工艺不但解决了银精矿含铅过低无法单独处理的问题,而且有效利用了银精矿反应过程中产生的热。此工艺处理后的还原炉渣含铅量小于1.5%,银的回收率达到99%。本文对此工艺的流程和技术指标作了详细介绍,以期为相关人员提供参考。

At present,lead-zinc concentrate associated silver are usually smelted by oxygen bottom blowing smelting-liquid slag direct reduction process.When processing concentrates with a Pb grade of less than 30%,this process selects mixing the low lead-high silver concentrate with high-grade lead concentrates.However,this method has the problems such as large slag volume and low silver recovery rate.Aiming at the characteristics of typical low lead-high silver concentrate in a area in Shanxi,and the existing industrial layout,the oxygen bottom blowing smelting-liquid slag side blowing reduction process was designed for co-treating the low lead-high silver concentrate and lead paste.This process not only solves the problem that the lead content of the silver concentrate is too low and cannot be handled separately,but also effectively utilizes the heat generated during the reaction.The reduced slag after this process contains less than 1.5%of lead,and the recovery rate of silver reaches 99%.This article gives a detailed introduction to the process and technical indicators in order to provide reference for relevant personnel.