贵州某泥晶灰岩型含锑金矿金锑混浮试验

贵州某泥晶灰岩型含锑金矿石为块状构造，金属矿物主要为黄铁矿、针铁矿，含量小于1%，非金属矿物以方解石为主，另有少量石英、有机质等；金含量为6.04 g/t，显微镜下未见自然金粒，74.34%的金赋存在硫化矿中，游离金仅占总金的7.14%；硅酸盐、碳酸盐包裹金分别占11.96%和6.56%；锑主要以辉锑矿的形式存在。为高效、低成本回收矿石中的金、锑，对混合浮选工艺进行了试验研究。结果表明，在一段磨矿细度为-0.074 mm占71%的情况下1粗2扫混浮、尾矿再磨细度为-0.074 mm占92.7%的情况下再1粗2扫混浮、两粗精矿合并后3次精选、中矿顺序返回流程处理，最终获得了金品位为47.60 g/t、锑品位为9.81%、金回收率为76.68%、锑回收率为85.22%的金锑混合精矿，金锑混浮效果较理想。尾矿中金的回收及金锑分离工艺研究将另文介绍。

Gold and Antimony Mixed Flotation on a Micrite Gold Antimony ore in Guizhou

The micrite type antimony-containing gold ore in Guizhou is in blocky construction.Its metallic minerals are mainly pyrite and goethite，with content of less than 1%.Non-metallic minerals are calcite，and few of quartz，organic matter，etc.It contains gold of 6.04 g/t，and natural gold grains were not seen in microscope，74.34% of the gold occurred in sulfide ore，free gold accounted for only 7.14%，wrapped gold in silicate and carbonate accounted for 11.96% and 6.56% respectively.Antimony mainly existed in the form of stibnite.Bulk flotation process was studied to make high efficient recovery of gold and antimony at low costs.The results indicated that，at the grinding fineness of 71% passing 0.074 mm，through one roughing and two scavenging bulk flotation，one roughing and two scavenging bulk flotation after regrinding the tailings to 92.7% passing 0.074 mm，three cleaning flotation for the two mixed rough concentrate，and then middles back to the flow-sheet in turn，rough gold-antimony concentrate with gold grade of 47.60 g/t and recovery of 76.88%，antimony grade of 9.81% and recovery of 85.22% was obtained with good bulk floatation performance.Gold recovery from tailings and separation process of gold and antimony will be further described in another paper.