铁矾渣富氧强化还原挥发熔炼及熔炼终渣浸出毒性

Oxygen-Enriched Enhanced Reduction Volatilization Smelting of Jarosite Residue and Leaching Toxicity of Smelting Final Slag

铁矾渣是湿法炼锌过程中产生的一种含锌废渣,其大量堆存不仅对生态环境造成影响,还会导致有价金属资源的积压。采用富氧强化还原挥发熔炼工艺处理铁矾渣,考察反应时间、反应温度、配碳量、富氧浓度对熔炼过程铅、锌挥发率及熔炼终渣银含量的影响,并对熔炼终渣浸出毒性特征进行表征。结果表明,当反应温度为1250℃、反应时间90 min、配碳量10%、富氧浓度40%时,铅、锌挥发率分别为99.66%、99.88%,熔炼终渣含银量为11.58 g/t,熔炼终渣浸出液中Cd、Zn、Pb、Cu、As浓度均低于TCLP国际标准限值和《GB 5085.3—2007》标准限值。

Jarosite residue is a kind of zinc-containing waste slag produced in zinc hydrometallurgy,and its large accumulation will not only affect the ecological environment,but also lead to a backlog of valuable metal resources.The oxygen-enriched reduction and volatilization smelting process was used to treat the jarosite residue.Effects of reaction time,reaction temperature,carbon addition,and oxygen enrichment concentration on volatilization rate of lead and zinc during smelting and the silver content in smelting final slag were investigated.The leaching toxicity of final smelting slag was characterized.The results show that when reaction temperature is 1250℃,reaction time is 90 min,carbon addition is 10%and oxygen enrichment concentration is 40%,the volatilization rate of lead and zinc is 99.66%and 99.88%respectively,and silver content in final smelting slag is 11.58 g/t.The concentrations of Cd,Zn,Pb,Cu,and As in leaching solution of final smelting slag are all lower than the TCLP international standard limit and the《GB 5085.3—2007》standard limit.