(中南大學(xué) 資源加工與生物工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 研究水玻璃對(duì)微細(xì)粒鈦鐵礦、鈦輝石的抑制與分散性能，并通過(guò)動(dòng)電位測(cè)定和紅外光譜分析探討其作用機(jī)理。結(jié)果表明：在pH=5.5~7.0的弱酸性環(huán)境下，水玻璃對(duì)鈦鐵礦與鈦輝石的抑制表現(xiàn)出良好的選擇性，這是 因?yàn)樗Ａc鈦輝石間的強(qiáng)烈作用阻礙油酸鈉在鈦輝石表面的吸附，起到抑制作用。紅外光譜分析表明：水玻璃與鈦輝石發(fā)生化學(xué)吸附，而在鈦鐵礦表面吸附較弱；在弱酸性條件下，由于鈦鐵礦與鈦輝石表面帶異相電荷而 容易發(fā)生異相凝聚，添加水玻璃使二者表面電位均顯負(fù)電性，礦粒間靜電斥力迅速增大，從而減弱礦粒間的異相凝聚。
關(guān)鍵字: 鈦鐵礦；鈦輝石；水玻璃；抑制；分散
（School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:The depressing and dispersing performances of water glass on fine ilmenite and titanaugite were studied in flotation system. The action mechanism was also discussed by the results of Zeta potential tests and infrared spectroscopic analysis. The results show that the water glass has a good selective depression for titanaugite in a weakly acidic medium with pH of 5.5−7.0, which is attributed to the strong action intensity between the water glass and titanaugite, hindering the adsorption of sodium oleate on the surface of titanaugite. Infrared spectroscopic analysis shows that the water glass is chemically adsorbed on the surface of titanaugite but this reaction is weaker between the water glass and ilmenite; hetero-coagulation will occur easily under weak acidic condition because of the opposite surface charge of ilmenite and titanaugite. The surface potential of ilmenite and titanaugite can be decreased greatly with the addition of water glass, which results in electronegative particles and rapid increase of electrostatic repulsion. As a result, the hetero-coagulation of particles is weakened to a great extent.
Key words: ilmenite; titanaugite; water glass; depression; dispersion
