湖南某含砷金矿的工艺矿物学研究  

Research on Process Mineralogy of a Arsenic-containing Gold Ore in Hunan Province

作　　者：梁斌珺 胡海祥 邹尚 唐丽群 LIANG Binjun;HU Haixiang;ZOU Shang;TANG Liqun(Gannan University of Science and Technology,Ganzhou 341000,China;Hunan Huangjindong Mining Co.,Ltd.,Yueyang 410400,China;Guangxi Vactional College of Safety Engineering,Nanning 530100,China)

机构地区：[1]赣南科技学院,江西赣州341000 [2]湖南黄金洞矿业有限责任公司,湖南岳阳410400 [3]广西安全工程职业技术学院,广西南宁530100

出　　处：《金属矿山》2022年第9期132-139,共8页Metal Mine

基　　金：江西省教育厅资助项目(编号:GJJ181513);江西省科技厅自然科学基金面上项目(编号:20202BAB204014);中国博士后科学基金资助项目(编号:2020M671959);江西省博士后科研择优资助项目(编号:2019KY51)。

摘　　要：湖南某地金矿石中含有较高的砷和碳,浮选所得金精矿中金的品位和回收率均较低,属难处理金矿的典型代表。为充分了解该金矿石的性质以优化浮选指标,利用化学多元素分析、X射线衍射仪、光学显微镜、扫描电镜(SEM)、元素化学物相分析和矿物参数自动分析系统(MLA)等多种测试手段对矿石的工艺矿物学进行了系统的研究。结果表明:矿石中有价元素金的平均品位为3.40 g/t,有害元素砷和碳的含量分别为0.36%和1.42%;矿石中的金属矿物主要为银黝铜矿、白钨矿、黄铁矿、毒砂和菱铁矿等,非金属矿物以石英和绢云母为主,其次为高岭石、绿泥石、蛇纹石等;矿石中的金矿物均为自然金,平均成色为999.5‰,主要呈角粒状和尖角粒状,其次为长角粒状,粒度小于19μm者占98.95%,属微细粒金的范畴;在磨矿细度为-0.074 mm占65%的条件下,矿石中的单体及裸露金和硫化物包裹金的分布率分别为5.90%和88.79%,二者合计分布率为94.69%,即该磨矿细度下金的最大理论回收率。推荐的原则工艺流程为重选+浮选。A gold ore in Hunan Province contains high arsenic and carbon,and the gold concentrate obtained by flotation process is with low grade and recovery rate,which is a typical representative of refractory gold ore.The process mineralogy of gold ore was systematically studied by means of chemical multi-elements analysis,X-ray diffractometer,optical microscope,scanning electron microscope(SEM),elemental chemical phase analysis and mineral liberation analysis(MLA)in order to fully grasp the ore properties for optimizing the flotation indexes.The results showed that the average grade of valuable element gold in the ore was 3.40 g/t,and the contents of harmful elements arsenic and carbon were 0.36%and 1.42%,respectively.The metallic minerals in the ore are mainly freibergite,scheelite,pyrite,arsenopyrite and siderite,while the non-metallic minerals are mainly quartz and sericite,followed by kaolinite,chlorite,serpentine and so on.The gold minerals in the ore are all natural gold with an average fineness of 999.5‰.The morphology of the gold is mainly angular-grain and angulargrained,followed by long horned granular.The gold particle size of less than 19μm accounted for 98.95%,which belongs to the category of micro-fine particle.The distribution rates of monomer,exposed gold and sulfide wrapped gold in the ore are 5.90%and 88.79%under the condition of grinding fineness of-0.074 mm accounting for 65%,respectively.And the total distribution rate of the two is 94.69%,which is the maximum theoretical recovery rate of the gold at this grinding fineness.The recommended principle process flowsheet is gravity separation and flotation.

关 键 词：含砷金矿 嵌布特征 粒度分布 金的赋存状态 

分 类 号：TD912[矿业工程—选矿]