(北京科技大學(xué) 金屬礦山高效開采與安全教育部重點(diǎn)實(shí)驗(yàn)室，北京 100083)
摘 要: 采用石硫合劑法對(duì)金精礦進(jìn)行浸出，考察硫黃、水與石灰質(zhì)量比和合成時(shí)間對(duì)硫的轉(zhuǎn)化率、母液pH值及金浸出效果的影響，通過XRD分析了渣的主要成分，揭示硫的轉(zhuǎn)化途徑。結(jié)果表明：在硫黃、石灰和H2O質(zhì)量比為2:1:(50~75)和時(shí)間為45 min的條件下，可得到硫轉(zhuǎn)化率為97.57%，pH值為10.5的石硫合劑；石硫合劑稀釋濃度為15%時(shí)，金的浸出率達(dá)到73.42%；硫黃與石灰的質(zhì)量比是影響硫轉(zhuǎn)化率和pH值的主要因素，隨質(zhì)量比的增加，硫的轉(zhuǎn)化率和pH值逐步降低；水與石灰的質(zhì)量比和合成時(shí)間對(duì)pH值影響較大，而對(duì)硫的轉(zhuǎn)化率幾乎沒有影響；硫在石硫合劑合成過程中主要進(jìn)入溶液，只有少量的硫以單質(zhì)的形式殘留在合成渣中，渣中殘留的硫隨硫黃與石灰質(zhì)量比的增加而增多。
關(guān)鍵字: 石硫合劑；浸出特性；金精礦；非氰浸金；轉(zhuǎn)化率
（Key Laboratory of High-Efficient Mining and Safety of Metal Mines,
Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China）
Abstract:Lime sulphur synthetic solution (LSSS) method was applied in gold concentrates leaching. The effect of mass ratio of sulphur, lime and water and synthetic time on sulfur conversion rate and pH value in synthetic process and gold leaching rate were investigated. X-ray diffraction was used to detect the main component of the residue aiming to uncover the transformation way of sulphur in LSSS synthetic process. The results show that the lime sulphur synthetic solution with sulfur conversion rate of 97.57% and pH of 10.5 is obtained when the synthesis conditions for mass ratio of sulphur, lime and water of 2:1:(50-75) and the time of 45 min. When the dilute concentration is 15%, the gold leaching rate reaches 73.42%. The mass ratio of sulfur to lime is the main reason affecting the sulfur conversion and pH value of mother solution. Both of sulfur conversion rate and pH value of mother solution show a declining tendency with the increase of the mass ratio of sulfur to lime. The mass ratio of water to lime and synthetic time has great effects on the pH value of mother solution, and has no effect on sulfur conversion rate. After LSSS preparation, sulfur mainly transfers into solution, a small amount of sulfur exists in the form of elemental sulfur in the residue, and the amount of this elemental sulfur increases with increasing the mass ratio of sulfur to lime.
Key words: lime sulphur synthetic solution; leaching characteristics; gold concentrates; cyanide-free leaching of gold; conversion rate
