摘要
内蒙古某锌冶炼公司采用热酸浸出-低污染黄钾铁矾法炼锌工艺,浸出生产过程中产生大量的铁矾渣和高浸渣,渣中锌含量占到冶炼过程中锌总损失的60%以上。本文采用中和-沉锌法处理浸出两渣,处理过程中的二次滤液的处理是关键。此工艺采用石灰中和pH值4～4. 5,保证大量铁进入渣中,并且滤液中的锌不被沉淀;采用破酸钠控制pH值6～7,保证大部分锌沉淀,加入少量的滤液搅拌返回浸出系统,同时Na^+返回浸出可取代部分碳铵作为沉矾剂使用。工艺现场改造并实践后,两渣中锌含量明显降低,锌漫出回收率从96.44%提高到97.47%,每月可增加收益约170万元。
A zinc smelter in Inner Mongolia adopts the hot acid leaching-jarosite process for zinc hydrometallurgy.During leaching a large amount of jarosite residue and high-acid leached residue were yielded,with Zn in the two residues accounting for more than 60%of total zinc loss during the whole hydrometallurgy.The two types of residue were treated by the neutralization-zinc precipitation process.The secondary filtrate treatment is the key to the process.Lime was used for neutralization for obtaining pH value 4-4.5,guaranteeing a large amount of Fe into the residue while zinc in the filtrate not be precipitated.Na2 CO3 was used to control pH value 6-7,guaranteeing most of Zn to be precipitated,while a small amount of filtrate was added for agitation and return to leaching system.Na+returns to leaching to replace ammonium bicarbonate as jarosite precipitation reagent.After modification,the Zn content in the two types of residue was greatly reduced,with Zn leaching recovery improved from 96.44%to97.47%and increased economic benefit of 1700 thousand RMB per month.
作者
林志富
王健
丁文涛
王斐
王芳
郝振
LIN Zhi-fu;WANG Jian;DING Wen-tao;WANG Fei;WANG Fang;HAO Zhen
出处
《中国有色冶金》
CAS
2019年第1期46-48,共3页
China Nonferrous Metallurgy
关键词
湿法炼锌
铁矾渣
高浸渣
中和-沉锌
锌浸出回收率
zinc hydrometallurgy
jarosite residue
high-acid leaching residue
neutralization-zinc precipitation
zinc leaching recovery
