(中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083)
摘 要: 提出一種處理復(fù)雜難處理金精礦的新工藝，主要包括還原固硫熔煉富集金和電解分離鉛金兩種主要工序。研究其中還原固硫熔煉富集金，分析熔煉溫度、鐵加入量、鉛加入量以及熔煉時間等因素對金直收率的影響，確定最佳工藝條件如下：添加四氧化三鐵、廢舊鉛酸蓄電池膠泥、氧化鈣和焦炭的質(zhì)量分?jǐn)?shù)分別是金精礦質(zhì)量的95%、86%、22%和10%，樣品在1100 ℃下熔煉1 h后在1200 ℃保溫30 min，金的直收率和總收率分別達(dá)到97.02%和 98.53%，金得到有效富集，由原金精礦中金含量18.05 g/t提高到鉛合金中金含量49.56 g/t，含量提高約1.73倍。
關(guān)鍵字: 復(fù)雜難處理金礦；還原固硫熔煉；富集金；鉛合金
（School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:A new technology composed of two main processes, namely, enriching gold by reducing sulfur-retention smelting and electrolysis to separate lead and gold, was proposed for the treatment of refractory gold concentrates. The processes of reducing sulfur-retention smelting were investigated. The effects of smelting temperature, iron addition amount, lead addition amount and smelting time on direct recovery rate of gold were analyzed. The results show that the optimum conditions are as follow: the addition amount of Fe3O4, lead-acid battery colloid sludge, CaO and metallurgical coke is 95%,86%,22% and 10% (mass fraction) of the amount of gold concentrates, respectively, and the sample was melted at 1100 ℃ for 1 h and then at 1200 ℃ for 30 min. Under the optimum conditions, the direct and total recovery ratios of gold are 97.02% and 98.53%, respectively, so gold is collected effectively. The gold content of 49.56 g/t in the lead alloy increases by about 1.73 times than that of 18.05 g/t in the gold concentrate.
Key words: refractory gold concentrate; reducing sulfur-retention smelting; enriching gold; lead alloy
