微细粒石英对萤石浮选特性的影响研究

通过萤石和石英的纯矿物浮选试验、二者质量比为1∶1的人工混合矿浮选试验、表面电位分析和药剂吸附量测定,系统地研究了油酸钠浮选体系中微细粒石英对萤石浮选效果的影响。结果表明,在pH=6时,石英颗粒表面荷负电,萤石颗粒表面荷正电,二者易发生异相凝聚,降低油酸钠在萤石颗粒表面的吸附,造成浮选指标下降;氟硅酸钠能够有效抑制石英;六偏磷酸钠通过调节矿物表面电位,可改善萤石-石英体系分散程度,提高浮选指标。萤石与石英的人工混合矿矿浆在六偏磷酸钠、氟硅酸钠和油酸钠浓度分别为3×10~(-5)、2×10~(-5)和6×10~(-5)mol/L时,浮选精矿萤石品位达97.10%、回收率为60.80%。

Influence of Fine Quartz on the Flotation Behavior of Fluorite

The effect of fine quartz on the fluorite flotation in sodium oleate flotation system was systematically investigated by the flotation tests of fluorite and quartz,flotation experiment of artificial fluorite-quartz mixture (1 ∶ 1,mass ratio) ore,Zeta potential analysis and collector absorption test.The results indicated that the quartz particles are negatively charged,while fluorite particles are positively charged at pH 6.0.A hetero-coagulation is generated in them,and the absorption of sodium oleate to fluorite is decreased,resulting in a lower flotation index.The quartz is well depressed by sodium fluosilicate.By adjusting the Zeta potential of minerals,the sodium hexametaphosphate can improve the dispersion of fluorite-quartz ore and increase the flotation index of fluorite.The fluorite concentrate with CaF2 grade of 97.10％ and the recovery of 60.80％ is obtained with the dosage of sodium hexametaphosphate,sodium fluosilicate and sodium oleate of 3 × 10-5 mol/L,2× 10-5 mol/L and 6× 10-5 mol/L respectively in the fluorite-quartz mixture ore flotation.