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野外取代表性矿样10t,经缩分破碎处理利用化学分析、透反两用偏光显微镜、X射线衍射、MLA、电子探针等测试手段对广南老寨湾金矿的工艺矿物学特征进行系统研究。结果表明,矿石岩石类型主要以沉积岩为主,矿石中金(Au)含量为1.62×10~(-6),电子探针点测数据显示,黄铁矿中金的含量在0.000~0.105%之间,黄铁矿确定为金(Au)的主要载体矿物;毒砂中金的含量在0.000~0.052%之间,毒砂很可能是金的载体矿物之一,除黄铁矿及毒砂之外,未发现其他载金矿物。经MLA分析,黄铁矿及毒砂中的金(Au)以超显微包裹体的形式存在,黄铁矿及毒砂嵌布粒度较细。最后笔者建议采用“黄药浮选-焙烧-浸出”工艺对该矿石中的金进行分选。
In the field, 10t of representative mineral samples were taken out, and the mineralogy characteristics of the Laozhaiwan gold deposit in Guangnan were analyzed by chemical analysis, reverse polarized light microscope, X-ray diffraction, MLA and electron probe. system Research. The results show that the main types of ore rocks are mainly sedimentary rocks, the gold content in the ore is 1.62 × 10 -6, and the data from the electronic probe shows that the gold content in the pyrite ranges from 0.000 to 0.105% , The pyrite was identified as the main carrier mineral of gold (Au). The content of gold in arsenopyrite was between 0.000 and 0.052%. Arsenopyrite was probably one of the carrier minerals of gold except pyrite and arsenopyrite No other gold-bearing minerals were found. According to the MLA analysis, gold (Au) in pyrite and arsenopyrite exists in the form of ultra-microscopic inclusions, and pyrite and arsenopyrite have a narrower grain size. Finally, I suggest the use of “yellow drug flotation - roasting - leaching ” process to sort the gold in the ore.