某高砷高硫重砂矿选冶联合综合回收金的试验研究  

Experimental study on comprehensive recovery of gold from a high-arsenic and high-sulfur heavy mineral sand by a combined process of mineral processing and metallurgy

作　　者：胡诗彤 陈宇 刘立新 周健 陈建福 吴为荣 HU Shi-tong;CHEN Yu;LIU Li-xin;ZHOU Jian;CHEN Jian-fu;WU Wei-rong(Jiangxi Sanhe Gold Industry Co.,Ltd.,Dexing 334200,China)

机构地区：[1]江西三和金业有限公司,江西德兴334200

出　　处：《中国有色冶金》2022年第6期40-44,共5页China Nonferrous Metallurgy

基　　金：江西省科技计划一般项目“难处理金精矿高效脱硫脱砷生物氧化提金技术研究”(20192BBG70061)。

摘　　要：某高砷高硫重砂矿中部分金矿物与含砷硫矿物伴生,金往往以微细粒包裹体形式分布在毒砂中,或金与毒砂共生,采用常规的冶炼方法很难获得较高的金回收指标。针对该矿内金的赋存特点,进行了选冶联合工艺研究,试验表明通过磨矿+摇床重选方式可获得含金35%的高品位金精矿,可直接冶炼预回收;摇床尾矿再磨后采用生物氧化预处理工艺,在给矿浓度10%,溶氧量3.5 mg/L,生物氧化9 d条件下,砷氧化率高达98.52%,硫氧化率高达94.29%;摇床重选+生物氧化+氰化炭浸选冶联合工艺金总回收率高达99.42%。该研究实现了难处理金矿的高效回收,可为高砷高硫重砂矿的回收提供技术参考。In a high-arsenic and high-sulfur heavy mineral sand,partial gold minerals are associated with arsenic-bearing sulfide minerals,and the gold is often distributed in arsenopyrite in the form of wrapped micro-fine partciles or intergrowns with the arsenopyrite.Hence,it is quite difficult to obtain a high gold recovery index by conventional smelting method.According to the occurrence characteristics of gold in the heavy mineral sand,a combined process of mineral processing and metallurgy was investigated.The results show that a high-grade gold concentrate containing 35% of gold can be obtained by grinding and shaking bed gravity separation,which can be directly smelted and pre-recovered;after regrinding of tailings from shaking bed,biological oxidation pretreatment process is adopted;under the conditions of 10% feed concentration,3.5 mg/L dissolved oxygen and 9 days of biological oxidation,the arsenic oxidation rate is up to 98.52% and the sulfur oxidation rate is 94.29%.The total gold recovery in the combined process of shaking bed gravity separation + biological oxidation + cyanidation carbon in leach(CIL) process is up to 99.42%.Efficient recovery of refractory gold is realized in this study,providing technical reference for the recovery of gold from a high-arsenic and high-sulfur heavy mineral sand.

关 键 词：高砷高硫重砂矿 磨矿 摇床重选 生物氧化 氰化炭浸 金精矿 回收率 

分 类 号：TF831[冶金工程—有色金属冶金]