国外某含蛇纹石绿泥石微细粒难选金矿石选矿试验

国外某金矿主要有价元素为金、铜，银达到综合利用标准。脉石矿物中蛇纹石、绿泥石含量较高，导致现场浮选精矿的金品位不高，尾矿含金1.8~2.0 g/t。为优化现有浮选工艺流程及药剂制度，基于矿石性质，采用浮选—浸出工艺进行金矿提纯研究。结果表明：①试样在磨矿细度为-0.074 mm占90%、六偏磷酸钠用量为2 500 g/t、1801+戊基黄药用量为40+70 g/t、松醇油用量10 g/t的条件下，采用2次粗选、3次扫选、1次精选闭路浮选流程处理，可获得金品位158.6 g/t、金回收率73.40%的金精矿，金精矿铜品位8.79%、铜回收率73.75%，银品位321.8 g/t、银回收率74.22%。②采用环保提金剂圣的对闭路浮选尾矿进行浸出，当pH调整剂石灰用量为2 000 g/t、圣的用量为3 000 g/t、浸出时间为24 h时，金浸出率为80.00%。试验最终取得金综合回收率为94.68%的良好指标，研究结果为该类型金矿资源的有效回收提供了借鉴。

Experimental Study on Mineral Processing of a Micro-fine Particle Refractory Gold Deposit Abroad Containing Serpentine and Chlorite

The main valuable elements of a foreign gold deposit are gold and copper，and the contents of silver meets the comprehensive utilization standard. The contents of serpentine and chlorite in gangue minerals are high， which leads to the low gold grade of on-site flotation concentrate. The gold contents of tailings is between 1.8 and 2.0 g/t. In order to optimize the existing flotation process and reagents system， flotation and leaching process was adopted to study the gold ore purification based on the properties of the ore. The results showed that: ①In the condition of grinding fineness of -0.074 mm accounting for 90%， the dosage of sodium hexametaphosphate of 2 500 g/t， the dosage of collector 1801 and amyl xanthate of （40+70） g/t， the dosage of terpenic oil of 10 g/t， the gold concentrate of gold grade of 158.6 g/t， gold recovery rate of 73.40% was obtained after two roughing， three scavenging and one cleaning. The copper grade and recovery rate are 8.79% and 73.75%， respectively， and the silver grade and recovery rate are 321.8 g/t and 74.22%， respectively. ② The Shengdi was used as gold extraction agent with the flotation closed circuit tailings. The gold leaching rate was 80.00% when the dosage of pH adjusting agent lime of 2 000 g/t， the dosage of gold extraction agent of 3 000 g/t， and the leaching time of 24 h. Finally， the comprehensive recovery rate of gold is 94.68%. The research results provide reference for the effective recovery of this type of the gold resources.