贵州某卡林型金矿工艺矿物学研究  

Study on Process Mineralogy of a Carlin-type Gold Deposit in Guizhou

作　　者：朱志雄 聂光华[1,3] 邓强 杨勇[1,2] 唐云[1,2] ZHU Zhixiong;NIE Guanghua;DENG Qiang;YANG Yong;TANG Yun(School of Mines,Guizhou University,Guiyang 550025,China;National and Local Joint Key Laboratory of Efficient Utilization of Advantageous Mineral Resources in Karst Areas,Guiyang 550025,China;Guizhou Central Laboratory of Geology and Mineral Resources,Guiyang 550025,China)

机构地区：[1]贵州大学矿业学院,贵阳550025 [2]喀斯特地区优势矿产资源高效利用国家地方联合重点试验室,贵阳550025 [3]贵州省地质矿产中心实验室,贵阳550025

出　　处：《有色金属（选矿部分）》2024年第4期33-39,58,共8页Nonferrous Metals（Mineral Processing Section）

基　　金：贵州省科技计划项目(黔科合支撑[2022]一般225)。

摘　　要：运用工艺矿物学参数自动分析系统(BPMA)、X射线衍射(XRD)、X射线荧光光谱仪(XRF)等多种测试手段,对矿石的化学成分、矿物组成、金的赋存状态及载金矿物与脉石矿物的嵌布特征、元素赋存状态进行了详细研究。研究表明:卡林型金矿中Au含量为4.75g/t,是最主要的有价元素,59.36%的金以包裹金的形式存在,其中硫化矿中包裹金最高,为42.95%。次以碳质含金的形式存在,微量以裸露金的形式存在。包裹金含量较多,即使在细磨条件下也很难实现单体解离或裸露,不利于提高金矿的回收率。主要的载金硫化矿物为黄铁矿和毒砂。脉石矿物主要有白云石、石英、方解石、黏土矿物等;黄铁矿主要集中在0.015~0.02mm粒级,毒砂主要集中在0~0.005mm粒级,白云石主要集中在0.104~0.147mm粒级,方解石主要集中在0.104~0.147mm粒级,石英主要集中在0.104~0.147mm粒级,5种矿物当中,毒砂的细颗粒最多,黄铁矿其次,方解石、白云石和石英的粗颗粒较多。随着物料粒度的降低,矿石中黄铁矿品位会随着升高;黄铁矿作为最主要的载金矿物,颗粒较细,且主要嵌布在绢云母、石英、白云石等矿物中,也有部分单体存在。为了使黄铁矿能够充分单体解离,建议在磨矿阶段提高磨矿时长或是采用多段磨矿的工艺流程。The chemical composition,mineral composition,occurrence status of gold,distribution characteristics of gold-bearing minerals and gangue minerals,and occurrence of elements of the ore were studied in detail by means of automatic process mineralogical parameter analysis system(BPMA),X-ray diffraction(XRD),X-ray fluorescence spectrometer(XRF)and other testing methods.The results show that the content of Au in carlin-type gold deposits is 4.75 g/t,which is the most important valuable element,and that 59.36%of the gold exists in the form of coated gold,most of which(42.95%)coated by sulfide minerals.Gold in the ore exists secondarily in the form of carbonaceous gold,and trace amount exists in the form of bare gold.Due to the high content of coated gold,it is difficult to achieve liberation or exposure even under fine grinding conditions,which is not conducive to improving the recovery of gold.The main gold-bearing sulfide minerals are pyrite and arsenopyrite,Gangue minerals are mainly dolomite,quartz,calcite,clay minerals,etc.Pyrite concentrated mainly in the 0.015-0.02 mm size range,arsenopyrite concentrated mainly in the 0-0.005 mm size range,dolomite concentrated mainly in the 0.104-0.147 mm size range,calcite concentrated mainly in the 0.104-0.147 mm size range,quartz concentrated mainly in the 0.104-0.147 mm size range,quartz concentrated mainly in the 0.104-0.147 mm size range.Among the five minerals,arsenopyrite has the most fine particles,followed by pyrite,while calcite,dolomite and quartz have more coarse particles.With the decrease of particle size,the grade of pyrite increases.As the main gold-bearing mineral,pyrite has most fine grains and is mainly embedded in sericite,quartz,dolomite and other minerals,some free particles also exist.In order to fully liberate pyrite,it is suggested to increase grinding time in grinding stage or adopt multi-stage grinding process.

关 键 词：卡林型金矿 工艺矿物学 低品位 

分 类 号：TD912[矿业工程—选矿]