ZnSO4·7H2O与水玻璃组合抑制剂对萤石、方解石浮选分离的影响

Effect of ZnSO4·7H2O and Sodium Silicate as Combination Inhibitors on Flotation Separation of Fluorite and Calcite

萤石是氟化学工业的重要原料。随着易选萤石矿的逐渐枯竭,难选伴生型萤石矿的资源利用越来越受到重视。由于萤石和方解石的表面物理化学性质相似,方解石型萤石矿的分离一直是选矿界的难题。通过单矿物浮选试验、吸附量测定、Zeta电位测量以及浮选溶液化学计算,研究了ZnSO4·7H2O与水玻璃组合抑制剂对萤石、方解石浮选分离的影响及其机理。浮选试验结果表明,相对于水玻璃,Zn-水玻璃(ZnSO4·7H2O与水玻璃混合物)对方解石的选择性抑制效果远大于萤石,可以达到两种矿物的有效分离。吸附量测定、Zeta电位测量和浮选溶液化学计算结果表明,Zn^2+与水玻璃混合后,在溶液中生成的Zn-水玻璃聚合物以及Si(OH)4可以选择性吸附在方解石表面,阻碍了NaOL在方解石表面的吸附,从而达到萤石和方解石的分离。

Fluorite is an important raw material for fluorine chemical industry.With the depletion of fluorite ore,more and more attention is paid to the resource utilization of fluorite ore.Because the physical and chemical properties of fluorite and calcite are similar,the separation of fluorite and calcite has been a difficult problem in the field of mineral processing.In this paper,the effect of ZnSO4·7H2O and sodium silicate as combination inhibitors on flotation separation of fluorite and calcite and its mechanism were studied by single mineral flotation test,adsorption measurement,Zeta potential measurement and chemical calculation of flotation solution.The results of flotation tests show that,compared with sodium silicate,Zn-sodium silicate(ZnSO4·7H2O mixed with sodium silicate)has a much better selective inhibition effect on calcite than fluorite,and can achieve the effective separation of two minerals.The results of adsorption measurement,Zeta potential measurement and flotation solution chemical calculation showed that,Zn-sodium silicate polymers and Si(OH)4 formed in the solution could be selectively adsorbed on the surface of calcite.The adsorption of NaOL on calcite was blocked and achieved separation of fluorite and calcite.