(中南大学 资源加工与生物工程学院,长沙 410083)
摘 要: 通过DLVO理论计算、动电位、接触角和扫描电镜检测及浮选试验,研究影响钛辉石和钛铁矿颗粒间相互作用的3个主要因素,即表面电性、颗粒粒径和表面润湿性。结果表明,钛辉石和钛铁矿的表面荷电绝对值增大,则颗粒间斥力增大;粒径越大,斥力越大。通过人工混合矿浮选试验结果和扫描电镜检测验证,微细粒钛辉石会在钛铁矿表面发生罩盖现象;矿物表面疏水性增强,两种矿物颗粒间的引力相应增大。
关键字: 钛辉石;钛铁矿;表面电性;颗粒粒径;表面润湿性
titanaugite and ilmenite
(School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China)
Abstract:Three main factors (viz. surface potential, particle size and surface wettability) that influence the interparticle interaction between titanaugite and ilmenite particles were investigated in detail through the calculation of DLVO theory, measurements of electrokinetic potential and contact angle, experiments of floatation and characterization of scanning electron microscope (SEM). The results show that the repulsion between particles increases with increasing absolute surface potential of titanaugite and ilmenite, and the bigger the particle size, the greater the repulsion. According to the results of floatation of artificial mixed mineral and characterization of SEM, the surface of ilmenite will be coated by micro-size titanaugite, and the increase of mineral surface hydrophobicity can result in the increase of attractive force between the two kinds of mineral particles.
Key words: titanaugite; ilmenite; surface potential; particle size; surface wettability