海南某金矿尼尔森重选-浮选试验

以海南某石英脉型金矿石为原料，进行尼尔森重选-浮选试验研究.通过GRG试验得出金矿中重选可回收金质量分数为80.88%.通过条件试验确定了该矿石尼尔森重选-浮选的最佳条件为:磨矿细度-74μm占80%，相对离心力60g，反冲水压16kPa，矿浆质量分数40%，戊基黄药用量200g/t，浮选时间5 min.原矿石品位9.8g/t，利用尼尔森选矿机一次分选可得品位230g/t，金回收率80.30%的重选精矿.重选尾矿品位2.0g/t，经过一次粗选一次精选三次扫选处理，可得浮选精矿品位57.3g/t，浮选金作业回收率75.66%.经尼尔森重选-浮选流程处理后，尾矿金品位降至0.5g/t，全流程金总回收率95.21%.

Processing a Gold Ore from Hainan Province Using Knelson Gravity Concentration-Flotation

The experimental study of Knelson gravity concentration-flotation technology of a quartz-vein type gold ore in Hainan Province was carried out. The GRG(gravity recoverable gold) test showed that the gold content in the gold ore is 80.88%. The optimal technological conditions of Knelson gravity concentration-flotation for the ore were determined by condition test to be a grinding size of 80% powder below 74μm， a relative centrifugal force of 60g， a fluidizing water pressure of 16kPa， a feed slurry mass fraction of 40%， a dosage of amyl xanthate of 200g/t and a flotation time of 5min. A gold concentrate with grade of 230g/t and recovery of 80.30% can obtained from the raw ore(9.8g/t) by gravity separation， and a gold concentrate with grade of 57.3g/t and recovery of 75.66% can be obtained from the gravity separation tailing by a flotation process of one roughing， one cleaning and three scavengings. The gold grade of final tailings is 0.5g/t and the total gold recovery in the Knelson gravity concentration-flotation process is 95.21%.