选冶联合回收某高硫黄金尾矿中金的试验研究  

Experimental Study on Gold Recovery from a High-Sulfur Gold Tailings by Beneficiation-Metallurgy Combination

作　　者：杨玮[1,2,3] 叶金秋 龙涛 邓莎[1,2,3] 王文涛 YANG Wei;YE Jinqiu;LONG Tao;DENG Sha;WANG Wentao(School of Resources Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,Shaanxi,China;Key Laboratory of Gold and Resources in Shaanxi Province,Xi’an 710055,Shaanxi,China;Technology&Equipment Institute of Green Beneficiation-Metallurgy,Xi’an University of Architecture and Technology,Xi’an 710055,Shaanxi,China)

机构地区：[1]西安建筑科技大学资源工程学院,陕西西安710055 [2]陕西省黄金与资源重点实验室,陕西西安710055 [3]西安建筑科技大学绿色选冶协同技术与装备研究所,陕西西安710055

出　　处：《黄金科学技术》2023年第1期113-122,共10页Gold Science and Technology

基　　金：国家自然科学基金项目“碲化物型金矿中碲的浸出机理研究”(编号:52174261);陕西省重点研发计划项目“选金尾矿资源高效回收低品位白钨矿及金的关键技术研究”(编号:2020SF-362)联合资助。

摘　　要：为实现选金尾矿资源中金的高效回收,对陕西省某含硫黄金尾矿(硫含量为11.60%、金含量为1.5×10^(-6)、包裹金含量为84.77%)进行预处理—浮选预富集—浮选中矿再磨—浸出的选冶联合工艺研究。结果表明:机械搅拌、超声及添加H_(2)SO_(4)、Na_(2)S预处理均可以改善金矿物表面性质,从而提高浮选回收率;原料添加H_(2)SO_(4)预处理后经2次粗选得到金品位为6.94×10^(-6)、金回收率为87.22%的混合粗精矿产品,浮选回收率较无预处理时提高了10.52%,实现了裸露金和硫化物包裹金的预先富集;粗精矿经一次抑硫精选,获得金品位为21.65×10^(-6)的金精矿;在-0.038 mm含量占95%、NaCN质量浓度为0.16%和浸出时间为48 h的条件下,精选中矿直接浸出率为91.48%,实现了包裹金的分离回收;最终得到金的选冶联合总回收率为80.45%,实现了高硫包裹型难处理金尾矿资源的高效回收。In order to realize the high-efficiency recovery of gold from gold tailings,an experimental study was carried out on gold tailings in Shaanxi Province.The chemical analysis shows that 11.60%S,1.5 g/t Au and 84.77%wrapped gold is contained in the raw material,which belongs to high-sulfur wrapped refractory gold ore.Due to the difficulty to separate gold from sulfur by a single flotation process,and obtaining qualified concentrate products,the combined process of pretreatment-flotation preconcentration-flotation middling regrinding-leaching was applied in the experimental research to improve the gold recovery.The results show that with mechanical agitation,ultrasonic,and pretreatment with H_(2)SO_(4) and Na_(2)S,the surface properties of gold minerals can be improved and the flotation recovery increase,among which H_(2)SO_(4) is the best pretreatment.With 100×10^(-6) of sulfuric acid,110×10^(-6) of copper sulfate,80×10^(-6) of butane yellow,40×10^(-6) of butane black and 30×10^(-6) of 2 # oil,and after two roughing operations,the mixed coarse concentrate product with an gold grade of 6.94×10^(-6) and a recovery rate of 87.22%are obtained.The flotation recovery rate is 10.52%higher than that without pretreatment,realizing the preconcentration of bare gold and sulfide-coated gold.As the gold in the coarse concentrate is mostly in sulfide wrapped state,it is difficult to achieve full productization.Therefore,under the conditions that the amount of sodium silicate,sodium hexametaphosphate,and NaCN is 500×10^(-6),200×10^(-6),and 50×10^(-6) respectively,the sulfur suppression concentration process is adopted to obtain a gold concentrate with an gold grade of 21.65×10^(-6) and a part of qualified gold concentrate products are obtained.The beneficiated middlings was leached for 48 h under the conditions of−400 mesh gold concentrate,accounting for 95%,and NaCN concentration of 0.16%,the direct leaching rate is 91.48%,and the final combined recovery rate of gold is 80.45%,showing the realization of the efficient

关 键 词：选冶联合 黄金尾矿 高硫金矿 包裹金 预处理 抑硫精选 

分 类 号：TD953[矿业工程—选矿]