金属离子对辉钼矿浮选的影响及机理研究

通过对辉钼矿纯矿物的浮选实验和动电位的测试,研究了金属离子对辉钼矿浮选的影响及作用机理.研究结果表明,Ca~(2+),Cu~(2+),Pb~(2+),Fe3+均可在辉钼矿表面形成吸附,但Ca~(2+)对辉钼矿的浮选结果没有明显影响,只有Cu~(2+),Pb~(2+)和Fe3+对辉钼矿的浮选产生了抑制作用.通过溶液化学计算发现,在一定的p H值范围内,Cu~(2+),Pb~(2+)和Fe3+形成的氢氧化物沉淀会特定地吸附于辉钼矿的极性和非极性表面,产生异相凝聚,导致辉钼矿表面亲水,可浮性下降.

Influence and Mechanism of Metal Ions on Flotation of Molybdenite

The influences and mechanism of metal ions on the flotation of molybdenite were investigated by flotation experiments and measurements of zeta potential with single molybdenite. The results show that Ca²⁺， Cu²⁺， Pb²⁺and Fe³⁺can adsorb on the surface of molybdenite. Ions like Cu²⁺， Pb²⁺and Fe³⁺ can depress flotation of molybdenite while Ca²⁺ shows no significant influence. Solution chemistry calculations confirm that the hydrophobic surfaces of molybdenite become hydrophilic and molybdenite flotation is depressed within certain pH range due to hetero-coagulation of the metal hydroxides of Cu²⁺， Pb²⁺and Fe³⁺on both the polar and nonpolar surfaces of molybdenite.