海南某金矿尼尔森重选-浮选试验

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

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16 k Pa,矿浆质量分数40%,戊基黄药用量200 g/t,浮选时间5 min.原矿石品位9.8 g/t,利用尼尔森选矿机一次分选可得品位230 g/t,金回收率80.30%的重选精矿.重选尾矿品位2.0 g/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57.3 g/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0.5 g/t,全流程金总回收率95.21%.

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 60 g,a fluidizing water pressure of 16 kPa,a feed slurry mass fraction of 40%,a dosage of amyl xanthate of 200 g/t and a flotation time of 5 min.A gold concentrate with grade of 230 g/t and recovery of80.30%can obtained from the raw ore(9.8 g/t)by gravity separation,and a gold concentrate with grade of 57.3 g/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 0.5 g/t and the total gold recovery in the Knelson gravity concentration-flotation process is 95.21%.