酸性生物预氧化渣硫脲浸金过程动力学  

Kinetics Study on Gold Leaching with Thiourea from Acid Bio-Oxidation Slag

作　　者：任传裕 武彪 尚鹤 温建康 邓静娴 张其东 Ren Chuanyu;Wu Biao;Shang He;Wen Jiankang;Deng Jingxian;Zhang Qidong(National Engineering Laboratory of Biohydrometallurgy,China GRINM Group Co.,Ltd.,Beijing 101407,Chi⁃na;GRINM Resources and Environment Tech.Co.,Ltd.,Beijing 101407,China;General Research Institute for Nonferrous Metals,Beijing 100088,China;GRIMAT Engineering Institute Co.,Ltd.,Beijing 101407,China)

机构地区：[1]中国有研科技集团有限公司生物冶金国家工程实验室,北京101407 [2]有研资源环境技术研究院(北京)有限公司,北京101407 [3]北京有色金属研究总院,北京100088 [4]有研工程技术研究院有限公司,北京101407

出　　处：《稀有金属》2024年第11期1661-1670,共10页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51574036,51704028)资助

摘　　要：随着黄金产量的逐年提高,易处理金矿逐渐减少,低品位难处理金矿受到了越来越多的关注,并逐渐成为了黄金生产原料的重要来源。针对新疆乌恰县某难处理金矿,经工艺矿物学及其他分析,其采用传统选冶方式难以产生经济效益。基于此,采用该矿进行了生物氧化预处理——硫脲浸金联合工艺研究。该联合工艺以硫脲作为浸金剂,硫脲既能直接处酸性生物预氧化渣,免去了传统氰化浸金工艺中的酸碱转化步骤,避免了矿石二次包裹的同时节省了大量药剂及成本,同时也避免了氰化物在浸金过程中导致的环保等一系列问题。分别考察了浸出温度、硫脲浓度、浸出pH、液固比、搅拌速度等因素对硫脲浸金过程中金浸出率的影响,采用收缩核模型探讨了酸性硫脲浸金体系浸出过程的表观动力学,实验结果表明,该过程的总体控制步骤为内扩散控制,并通过实验结果得出了其半经验动力学方程及反应的表观活化能,为该联合工艺的实际工业应用提供指导。Biohydrometallurgy technology had been widely used in the metallurgy of copper,nickel,gold,and uranium due to its ad⁃vantages of economy,efficiency,and environmental protection.With the increase of gold output year by year,the number of easy to handle gold deposits is decreasing,and the low-grade hard to handle gold deposits have attracted more and more attention,and gradu⁃ally become an important source of raw materials for gold production.Encapsulated gold deposits are the most widely used type of re⁃fractory gold deposits,characterized by fine gold bearing mineral particles,high content of harmful impurities,and a large proportion of encapsulated gold.Gold is encapsulated by metal sulfides,making leaching difficult.This type of mineral requires pre-oxidation treatment to remove the minerals wrapped on the surface of gold particles before further extraction of gold can be carried out.The pretreatment technologies for difficult to treat gold mines currently mainly include roasting oxidation,hot pressure oxidation,biological oxidation,chemical oxidation,etc.Among them,biological oxidation technology is a relatively mature technology.It has advantages such as simple operation,low equipment investment,and environmental protection,which is very suitable for the needs of China.In recent years,it has been rapidly promoted and applied in China.Since its inception,cyanide extraction has been the most widely used method in gold extraction due to its high economic benefits,mature process,and ability to adapt to various ores.However,cyanide has been restricted in development because of its toxicity and adverse effects on the environment.Therefore,it is necessary to find an efficient and environmentally friendly gold leaching agent that can replace cyanide.The non-cyanide gold leaching methods mainly in⁃clude thiosulfate gold leaching,halogen and its compound gold leaching,polysulfide and stone sulfur agent gold leaching,and thio⁃urea gold leaching.In the above-mentioned non-cyanide gold leaching methods,the thios

关 键 词：生物预氧化渣 酸性 硫脲浸出 金 动力学 

分 类 号：TF831[冶金工程—有色金属冶金]