(1. 南華大學(xué) 鈾礦冶生物技術(shù)國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室，衡陽(yáng) 421001；
2. 南華大學(xué) 核資源工程學(xué)院，衡陽(yáng) 421001)
摘 要: 為了提高難處理含金硫精礦中金的浸出率，采用同步熱分析儀研究在馬弗爐中焙燒氧化難處理含金硫精礦的最佳條件，通過優(yōu)化實(shí)驗(yàn)確定硫代硫酸鹽浸出的最佳工藝參數(shù)。結(jié)果表明：在馬弗爐中焙燒氧化難處理含金硫精礦最佳條件為在700 ℃溫度下焙燒2 h，難處理含金硫精礦硫的去除率可達(dá)94.7%。焙燒后，金的浸出率大幅度提高。使用組成為0.03 mol/L CuSO4、1.0 mol/L NH3？H2O、0.3 mol/L Na2S2O3、0.1 mol/L (NH4)2SO4和0.3 mol/L Na2SO3的硫代硫酸鹽溶液作為浸出劑，最佳浸出工藝參數(shù)如下：浸出時(shí)間18 h、液固比2:1、振蕩速度250 r/min、浸出溫度50 ℃。在此浸出工藝參數(shù)下，金浸出率達(dá)71.2%。
關(guān)鍵字: 難處理含金硫精礦；金；硫代硫酸鹽；浸出；焙燒；氧化
（1. Key Discipline Laboratory for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy,
University of South China, Hengyang 421001, China;
2. School of Nuclear Resource Engineering, University of South China, Hengyang 421001, China）
Abstract:In order to increase the leaching rate of gold from refractory gold-bearing sulfur concentrates the synchronous thermal analyzer was adopted to study the best condition of roasting and oxidizing refractory gold-bearing sulfur concentrates in the muffle, and the optimum technological parameters of thiosulfate leaching were ascertained through optimal experiment. The results show that the best conditions of roasting and oxidizing refractory gold-bearing sulfur concentrates are as follows: roasting in the muffle at 700 ℃ for 2 h with 94.7% removal rate of sulfur. After the roasting and oxidizing, the gold leaching rate increases substantially. The leaching rate of gold reaches 71.2% at the optimal leaching technological parameters of the leaching time 18 h, ratio of liquid to solid 2:1, oscillating speed 250 r/min, leaching temperature 50 ℃ when leaching lixiviation is composed of 0.03 mol/L CuSO4, 1.0 mol/L NH3？H2O, 0.3 mol/L Na2S2O3, 0.1 mol/L (NH4)2SO4 and 0.3 mol/L Na2SO3.
Key words: refractory gold-bearing sulfur concentrates; gold; thiosulfate; leaching; roasting; oxidation
