某含碳含砷难处理金矿石选矿工艺研究

Mineral Processing Technology of a Refractory Gold Ore Bearing Arsenic and Organic Carbon

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%。

The process mineralogy of a refractory gold ore bearing arsenic and organic carbon was studied. It showed that Au could be recovered from the refractory gold ore which contained high amounts of As and C. The main gold mineral was native gold mineral and finely disseminated in many minerals, such as pyrite, arsenopyrite, quartz, carbonaceous. According to the nature of the ore and the perspective of economic purpose, a combined heneflciation process of flotation-gravity was determined. In the stage of flotation, with the grinding fineness of - 0. 074 mm accounting for 80% , and the roughing pH of 7.87, the gold minerals were recovered by the flotation process of two roughing, two cleaning and one scavenging, using Na2CO3 as regulator, CuSO4 as activator, ammonium dihutyl dithiophosphate, sodium n-butyl xanthate and kerosene as collector, and then the gold recovery was enhanced by Nelson concentrator from floatation tailing. The gold concentrate by flotation process and Nelson concentrator were obtained with the gold grade of 49.23 g.t-1 and recovery of 71.23% , the gold grade of 54.41 g.t-1 and recovery of 16.12% , respectively. Finally, a gold concentrate was obtained with a grade of 50.11 g.t-1 Au and recovery of 87.35% was obtained.