(1. 安徽工業(yè)大學(xué) 冶金工程學(xué)院，馬鞍山 243032；
2. 中南大學(xué) 冶金與環(huán)境學(xué)院，長(zhǎng)沙 410083)
摘 要: 以復(fù)雜難處理金精礦火法造锍捕金所得鐵锍合金的硫酸浸出渣為原料，采用控電位氯化浸出工藝分離酸溶渣中的Cu、As、Sb等主要雜質(zhì)元素，貴金屬Au單向富集得到高品位金泥，Au泥經(jīng)過(guò)硫酸化焙燒脫硫進(jìn)一步富集貴金屬金。結(jié)果表明：雙電極體系控電位氯化浸出優(yōu)化條件為[H+]5mol/L、浸出電位380 mV、液固質(zhì)量比5:1、溫度85 ℃和攪拌浸出2 h，所得渣率為28.2%，浸出渣中Cu、As、Sb含量分別降到0.18%、0.095%、0.084%，浸出率分別達(dá)到99.6%、99.8%、99.8%，浸出渣主要成分Si和S的含量分別為29.39%和22.72%，Au品位富集到2.609%；浸出渣硫酸化焙燒脫硫的燒成率為66.5%，S含量降至0.87%，脫硫率為96.2%，焙砂的主要物相為SiO2和單質(zhì)金，Au品位富集到3.937%。復(fù)雜金精礦鐵锍合金酸溶渣通過(guò)控電位氯化浸出除雜—焙燒脫硫可將貴金屬金有效富集。
關(guān)鍵字: 鐵锍合金；酸浸渣；控電位；氯化浸出；金
（1. School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan 243032, China;
2. School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:The leaching residue of iron matte from the pyrometallurgical matte making process of refractory gold concentrate was used as the raw material to separate the impurities of Cu, As, and Sb with the controlled potential chloridizing leaching process. The precious metal Au was enriched and high-grade gold mud was obtained, which was sent to sulfation roasting desulfurization for further enrichment of Au. The results show that the double-electrode controlled potential chloridizing leaching conditions are 5 mol/L for H+ concentration, 380 mV for leaching potential, 5:1 for liquid to solid ratio, 85 ℃ for temperature and 2 h for leaching time. The residue rate is 28.2%, and the contents of Cu, As and Sb are decreased to 0.18%, 0.095%, and 0.084% with the leaching rates of 99.6%, 99.7% and 99.8%, respectively. The contents of Si and S in the leaching residue are 29.39% and 22.72%, and the Au content is enriched to 2.609%. The sulfation roasting desulfurization of the leaching residue achieved the firing rate of 66.5%. The S content is declined to 0.87% with the desulfurization rate of 96.2%. The major phases of the calcine are SiO2 and metallic Au, with the Au content being enriched to 3.973%. The precious metal Au is effectively enriched by controlled potential chloridizing leaching and roasting desulfurization of the iron matte leaching residue from refractory gold concentrate.
Key words: iron matte alloy; acid leaching residue; controlled potential; chloridizing leaching; gold
