(中南大学 资源加工与生物工程学院，长沙 410083)
摘 要: 研究了在油酸钠为捕收剂的浮选体系中，两种含硅抑制剂氟硅酸钠和水玻璃对微细粒钛铁矿与钛辉石浮选行为的影响。在实际矿石试验中，以水玻璃作为抑制剂且在弱酸性条件下(pH=5~6)成功实现钛铁矿与钛辉石的浮选分离，并通过吸附量测试、X射线光电子能谱(XPS)测试分析了水玻璃选择性分离钛铁矿的作用机理。结果表明：水玻璃对油酸钠在钛铁矿表面吸附影响小，却能在较大程度上降低油酸钠在钛辉石表面的吸附量，这为两种矿物的分离提供依据。其主要原因在于水玻璃能够与钛辉石表面的Mg、Fe和Al原子发生化学键合，增加钛辉石的亲水性，从而减少捕收剂在其表面的吸附。
关键字: 钛铁矿；钛辉石；抑制剂；浮选；水玻璃
（School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:Using sodium oleate as collector, the effects of sodium fluorosilicate and water glass on floatation behavior of fine ilmenite and titanaugite were investigated. The results show that, using the water glass as depressant in the weak acidic system with pH of 5−6, the ilmenite and titanaugite can be successfully separated by flotation in practical ore experiment. The results of adsorption measurements and X-ray photoelectron spectroscopy (XPS) show that the mechanism of selective separation of ilmenite by the water glass, namely, the water glass can effectively prevent the adsorption of sodium oleate onto the surface of titanaugite, while it shows little effect on the adsoption of sodium oleate onto ilmenite, which is the basis for flotation separation of both of minerals. Above-mentioned mechanism comes from the formed chemical bonds between the water glass and Fe，Mg and Al atoms on the surface of titanaugite, which effectively increases the hydrophilicity of titanaugite, as a result, reducing the adsorption of collector on titanaugite.
Key words: ilmenite; titanaugite; depressants; flotation; water glass
