针对河北某金矿矿石自然金粒度大小不等、嵌存状态复杂的特点，采用尼尔森重选-浮选工艺流程回收金取得了较为理想的指标。尼尔森选矿机处理一段磨矿产品回收中粗粒金，获得品位291 g／t、回收率26．71％的重选金精矿。尼尔森中矿并入尾矿一起再磨至-0．074 mm占85％，以丁基黄药和M-钠盐组合捕收剂强化金的浮选，获得品位122．7 g／t、回收率62．35％的浮选金精矿，金总回收率达到89．06％。相比单一浮选流程，金回收率提高3．57％。
Considering the characteristics of different sized native gold and complex embedding conditions of one gold ore,Nelson gravity-flotation process is used to recover gold and achieves satisfactory results .Nelson processing machinery treats the first-stage grinding products and recovers medium and large sized gold particles ,obtaining gravity separation gold concentrates with grade of 291 g/t and recovery rate of 26.71 %.Nelson middlings are mixed with tailings and together grinded to 85 % -0.074 mm.Combined collector of Butyl Xanthate and M-sodium salt is used to enhance gold flotation,obtaining flotation gold concentrates with grade of 122.7 g/t and recovery rate of 62.35%. Overall gold recovery rate reaches 89.06%and compared to single flotation process ,gold recovery rate is increased by 3 .57 %.
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