焙砂超浸强化硫脲浸金研究  

Research on enhanced thiourea leaching of gold from roasting sand by super leaching

作　　者：杜浩杰 张磊 郭学益 田庆华 衷水平 王亲猛 Du Haojie;Zhang Lei;Guo Xueyi;Tian Qinghua;Zhong Shuiping;Wang Qinmeng(School of Metallurgy and Environment,Central South University;Cleaner Metallurgical Engineering Research Center,China Nonferrous Metals Industry Association;Zijin School of Geology and Mining,Fuzhou University)

机构地区：[1]中南大学冶金与环境学院 [2]中国有色金属工业协会中国清洁冶金工程研究中心 [3]福州大学紫金地质与矿业学院

出　　处：《黄金》2024年第4期25-31,共7页Gold

基　　金：博士后创新人才支持计划(BX20230438);湖南省环保厅环境保护科研课题(HBKYXM-2023022)。

摘　　要：以焙砂为原料,首先经过酸洗预处理去除砷等有害元素,并减少杂质含量,降低硫脲消耗,考察硫酸质量浓度对砷、铁、铜、锌浸出率的影响,并对酸洗后的矿相转化行为进行了分析;同时,开展超浸与常规酸性硫脲体系浸金效果的对比研究。结果表明:酸洗预处理可有效脱除有害元素砷,最优条件下,砷、铁、铜、锌浸出率分别为96.3%、0.5%、22.7%、7.6%;超浸可降低颗粒粒径,强化反应动力,实现包裹金的深度解离,有效提高金浸出率。常规酸性硫脲体系金浸出率仅为54.6%,采用超浸工艺反应10 min,金浸出率达到84.6%,可实现金的高效浸出。Using roasting sand as raw material,the acid washing pretreatment process was first carried out to achieve the removal of arsenic,while removing other impurities and reducing the consumption of thiourea.The effect of sulfuric acid concentration on the leaching rate of arsenic,iron,copper and zinc was investigated,and the acid washing ore phase behavior was analyzed;at the same time,a comparative study was conducted on the leaching of gold using super leaching and conventional acid thiourea systems.The results show that acid washing pretreatment can effectively remove harmful element arsenic.Under optimal conditions,the leaching efficiency of arsenic,iron,copper and zinc are 96.3%,0.5%,22.7% and 7.6%,respectively;super leaching can reduce particle size,enhance reaction kinetics,achieve deep dissociation of encapsulated gold,and effectively improve the leaching efficiency of gold.The leaching efficiency of gold in the conventional acidic thiourea system is only 54.6%,and the leaching efficiency of gold after 10 min of reaction using the super leaching process reaches 84.6%,which can achieve efficient gold leaching.

关 键 词：焙砂 金 硫脲 酸洗预处理 超浸 

分 类 号：TF831[冶金工程—有色金属冶金]