中文摘要：

通过浮选试验、粒度分析测试和扫描电镜（SEM）分析,研究强搅拌调浆在金川硫化铜镍矿浮选中的作用,并考察其作用机制。浮选试验结果表明：强搅拌调浆能够提高金川硫化铜镍矿的浮选指标,强搅拌的时间越长,强度越强,金川硫化铜镍矿的浮选指标越好。固定调浆时间为20 min,当调浆强度从1950增加到2800 r·min^-1时,镍的浮选回收率从81%增加到87%。金川硫化铜镍矿中的蛇纹石矿泥与硫化矿物颗粒表面电性相反,容易通过静电吸引作用吸附在硫化矿物表面形成矿泥罩盖层,细颗粒矿泥的罩盖阻碍了硫化矿物颗粒和气泡的粘附,降低了硫化矿物的浮选回收率。粒度测试和扫描电镜分析结果证实了金川硫化铜镍矿中的粗颗粒硫化矿物表面罩盖有细颗粒矿泥,矿泥的主要成分为蛇纹石等含镁硅酸盐矿物。对矿浆进行强搅拌调浆能够脱附硫化矿物表面罩盖的蛇纹石矿泥,蛇纹石矿泥粒度越粗,越容易从硫化矿物表面脱附,而粒度极细的蛇纹石矿泥较难脱附。强搅拌的强度越强,时间越长,硫化矿物表面罩盖的蛇纹石矿泥数目越少,越容易与浮选气泡粘附,浮选回收率越高。

英文摘要：

The effect of high intensity conditioning（ HIC） on the flotation of Jinchuan nickel sulphide ore and its mechanism were investigated through flotation experiments,laser particle size analysis and scanning electron microscopy（ SEM） analysis. The results showed that high intensity conditioning（ HIC） could increase pentlandite flotation recovery significantly; the flotation performance became better with the conditioning time being longer and the conditioning intensity being stronger. The Ni recovery increased from 81%to 87% when the conditioning speed increased from 1950 to 2800 r·min^-1. The slimes in Jinchuan nickel sulphide ore possessed an opposite charge to the coarse sulphide particles. This created an electrostatic attraction force which resulted in the slimes forming a coating over the surface of the coarse particles. A coating of hydrophilic slime particles would prevent the attachment of the sulfide particle to flotation bubble and would result in lower recoveries of the valuable sulfide minerals. The result of laser particle size analysis and SEM analysis showed that there were slime coatings on the surface of valuable minerals and the main component of slime was magnesium silicate mineral,such as serpentine. The slimes attached to the surfaces of larger particles were effectively removed after high intensity conditioning treatment,and the amount removed depended upon both conditioning strength and time.