摘要
某冶炼企业采用锌酸浸渣锌精矿协同浸出-气相硫化-高温矿化除铁的处理技术路线处理锌酸浸渣,气相硫化后,酸浸渣中的铟、铜等有价金属硫化沉淀后富集于渣中,溶液仅含有Zn^(2+)(90 g/L左右)和Fe^(2+)(25 g/L左右),需进行锌、铁分离。本文以锌酸浸渣锌精矿协同浸出液经气相硫化后的溶液(简称为硫化后液)为研究对象,在分析Zn-Fe-S-H_(2)O系电位-pH图的基础上,考察了反应温度、时间、溶液初始pH、SO_(4)^(2-)浓度对铁沉淀行为的影响,并对矿化铁渣的品质、物相和微观形态进行了分析。结果表明,Fe_(2)O_(3)在高酸条件下拥有较高的稳定性,当反应温度>150℃时能有效破坏Fe3+的络合水化作用,使铁以Fe_(2)O_(3)的形态析出,增加硫酸盐浓度可进一步降低Fe_(2)O_(3)的溶解度;在反应时间4 h、反应温度190℃、溶液初始pH=4、SO_(4)^(2-)浓度<280 g/L的条件下,铁脱除率达89.19%,锌损失率<0.2%,实现了锌酸浸渣浸出液中锌的有效分离;矿化铁渣中含铁>60%,杂质较少,外形呈致密、细小颗粒状,可作为回收铁的原料。
A smelting enterprise adopts the technical route of zinc acid leaching slag zinc concentrate synergistic leaching-gas phase sulfidation-high temperature mineralization to treat zinc acid leaching slag.After gas phase sulfidation,valuable metals such as indium and copper in the acid leaching slag are precipitated and enrich in the slag.The solution only contains Zn^(2+)(about 90 g/L)and Fe^(2+)(about 25 g/L),and zinc and iron need to be separated.In this paper,the solution of co-leaching solution of zinc acid leaching residue and zinc concentrate after gas phase sulfidation(hereinafter referred to as sulfidation solution)was taken as the research object.Based on the analysis of the potential-pH diagram of Zn-Fe-S-H_(2)O system,the effects of reaction temperature,time,initial pH of solution and SO_(4)^(2-)concentration on iron precipitation behavior were investigated,and the quality,phase and microstructure of mineralized iron slag were analyzed.The results show that Fe_(2)O_(3)has high stability under high acid conditions.When the reaction temperature is higher than 150℃,the complexation and hydration of Fe3+can be effectively destroyed,and the iron is precipitated in the form of Fe_(2)O_(3).The solubility of Fe_(2)O_(3)can be further reduced by increasing the sulfate concentration.Under the conditions of reaction time 4 h,reaction temperature 190℃,initial pH=4 and SO_(4)^(2-)concentration<280 g/L,the removal rate of iron was 89.19%,and the loss rate of zinc was less than 0.2%.The effective separation of zinc from the leaching solution of zinc acid leaching residue was realized.The mineralized iron slag contains more than 60%iron with less impurities,and has a dense and fine granular shape,which can be used as a raw material for recovering iron.
作者
俞凌飞
朱北平
陈先友
张泽林
世仙果
YU Lingfei;ZHU Beiping;CHEN Xianyou;ZHANG Zelin;SHI Xianguo(Yunxi Wenshan Zinc Indium Smelting Co.,Ltd.,Wenshan 663700,China)
出处
《中国有色冶金》
北大核心
2026年第1期92-99,共8页
China Nonferrous Metallurgy
基金
云南省重大科技专项计划(202302AB080014)。
关键词
锌冶炼
锌酸浸渣浸出液
高温矿化
赤铁矿
锌铁分离
物相转化
铁脱除率
锌损失率
zinc smelting
zinc acid leaching residue leachate
high temperature mineralization
hematite
separation of zinc and iron
phase transformation
iron removal rate
zinc loss rate
