某金浸渣氧化焙烧—浸出提金工艺试验研究  

Experiment Research on Gold Extraction Process of A Gold Leaching Residue by Oxidizing Roasting and Leaching

作　　者：徐海龙 李艳军[1] 王绍兴 刘杰[1] XU Hailong;LI Yanjun;WANG Shaoxing;LIU Jie(College of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;Mining and Metallurgy Engineering Technology Co.,Ltd.,Northeastern University of Liaoning,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]辽宁东大矿冶工程技术有限公司,辽宁沈阳110819

出　　处：《金属矿山》2021年第3期130-135,共6页Metal Mine

基　　金：辽宁省兴辽英才计划项目(编号:XLYC1908017)。

摘　　要：江西某黄金冶炼厂的金浸出尾渣中Au的品位为2.7 g/t,具有较高的回收价值。但该浸出渣中有害杂质S、As的含量高达7.54%、1.98%,主要以黄铁矿和毒砂的形式存在,二者内部包裹的金颗粒在超细磨条件下也极难解离。为有效回收该尾矿渣中的金,基于试样性质,采用氧化焙烧—浸出的工艺处理该试样。浸出试验在溶液pH值为12、浸出剂JC用量5 kg/t、搅拌浸出时间6 h的条件下进行,通过条件试验确定最佳的焙烧条件为:焙烧温度500℃,焙烧时间30 min、空气流量500 mL/min、浸出细度-0.038 mm占98.85%。在最佳焙烧条件下,浸出尾渣中Au的品位降低至1.0 g/t,Au的浸出率达65.52%。化学分析和热重分析结果表明,焙烧过程中试样内部产生裂纹和孔隙,黄铁矿、毒砂等硫化矿被转化为氧化矿,减少了FeOOH的罩盖和浸出剂的消耗,从而有利于浸出反应的进行。研究结果可为同类型难处理金矿的利用提供参考。The grade of Au in the gold leaching residue from a gold smelter in Jiangxi Province is 2.7 g/t,which has a high recovery value. However,the contents of harmful impurities S and As in the leaching residue are high up to 7.54% and1.98%,respectively,mainly in the form of pyrite and arsenopyrite. The gold particles wrapped in the two minerals are also extremely difficult to be separated under the condition of ultra-fine grinding. In order to effectively recover the gold particles in the tailing residue,a process of oxidation roasting and leaching was adopted to treat the sample based on its properties.The leaching test was carried out under the conditions of pH value of 12,leaching agent JC dosage of 5 kg/t,stirring leaching time of 6 h. The optimal roasting conditions were determined by condition test as follows: roasting temperature of 500 ℃,roasting time of 30 min,air flow of 500 mL/min,and leaching fineness of-0.038 mm accounting for 98.85%. Under the optimal roasting conditions,the grade of Au in the leaching residue is reduced to 1.0 g/t,and the leaching rate of Au reaches65.52%. The results of chemical analysis and thermogravimetric analysis showed that cracks and pores appeared in the samples. The sulfide ores such as pyrite and arsenopyrite are transformed into oxidized ores during roasting,which reduce FeOOH cover and the consumption of leaching agent,and thus facilitate the leaching reaction. The research results provide reference for the utilization of refractory gold deposits of the same type.

关 键 词：金矿尾渣 高砷高硫 氧化焙烧 浸出 

分 类 号：TF831[冶金工程—有色金属冶金]