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对某含碳含砷难处理金矿进行了详尽的工艺矿物学研究,矿石中可供综合回收利用的元素为Au,有害元素As,C含量较高。金以独立金矿物形式存在,金矿物嵌布粒度细,分布不均匀,载金矿物种类多,性质复杂,主要有黄铁矿、毒砂、石英、炭质。根据矿石性质、考虑经济技术指标,确定采用浮选-重选联合工艺流程:在原矿磨矿细度-0.074 mm占80%,p H 7.87的条件下,添加碳酸钠作为调整剂、硫酸铜作为活化剂,丁基黄药、丁铵黑药和煤油作为捕收剂经两次粗选、两次精选、一次扫选,产出金精矿Ⅰ;采用尼尔森选矿机对浮选尾矿中金进行重选强化回收,产出金精矿Ⅱ。闭路试验获得金品位49.23 g·t~(-1)、回收率71.23%的金精矿Ⅰ;金品位54.41 g·t~(-1)、回收率16.12%的金精矿Ⅱ。合并金精矿Ⅰ和金精矿Ⅱ作为最终金精矿,最终金精矿金品位50.11 g·t~(-1)、回收率87.35%。
A detailed study on process mineralogy of a carbon-bearing arsenic-refractory gold ore is conducted. The elements available for comprehensive recovery and utilization in the ore are Au, and the harmful elements As and C are relatively high in content. Gold exists in the form of independent gold minerals. The finely distributed gold minerals are distributed unevenly, with many gold-bearing minerals and complex nature, mainly including pyrite, arsenopyrite, quartz and charcoal. According to the nature of the ore, considering economic and technical indicators, determine the flotation - re-election combined process: the ore grinding fineness -0.074 mm accounted for 80%, p H 7.87 conditions, the addition of sodium carbonate as a regulator, copper sulfate as Activator, butyl xanthate, butyl ammonium black drug and kerosene as collector by two rough selection, twice selected, a sweep, to produce gold concentrate Ⅰ; using Nelson concentrator on the flotation tailings Gold re-election to strengthen recycling, output gold concentrate Ⅱ. The gold concentrate Ⅰ with the gold grade of 49.23 g · t -1 and the recovery of 71.23% was obtained in the closed circuit test. The gold concentrate with the gold grade of 54.41 g · t -1 and the recovery rate of 16.12% was obtained. The gold concentrate Ⅰ and gold concentrate Ⅱ were combined as the final gold concentrate, the final gold concentrate gold grade was 50.11 g · t -1, the recovery rate was 87.35%.