关键词: 石英, 角闪石, 枝杈型表面活性剂, 接触角, 表面张力, 石英微天平

Abstract: Aiming at the difficults in the separation of silicon-containing minerals with the iron ores， the adsorption mechanism of combined anion collector on quartz was studied in order to provide a high quality collector for low temperature flotation. The mechanism of action of vinyl branching surfactant and sodium oleate collector in flotation was studied by using contact angle measuring instrument， surface tensiometer， infrared spectrometer and quartz microbalance （QCM-D）. The results showed that ①the synergistic effect of multi-branched surfactant and fatty acid enhanced the hydrophobic properties of quartz and amphibole， making the increase of the contact angle. Amphibole in silicone-containing compounds was more difficult to be adsorbed and separate compared with quartz. ②With the increase of collector concentration and temperature， the surface tension of the combined collector decreased gradually， and the collection ability was enhanced and easy to produce a stable foam layer. ③FTIR detecting results indicated that the characteristic peak of carboxylic acid root decreased to 1 561 cm-1 and 1 416 cm-1 after dipping and coating the combined collector， and a significant red shift occurred which indicating that the C-O bond energy was weakened and chemical adsorbtion occurred in the quartz surface. ④QCM-D test results showed that the energy factor changed to 6.23×10-6 after the combined collector adsorbed on the quartz crystal surface. A closed-circuit flotation process test of one coarse， one cleaning and three scavenging for mixed magnetic concentrate was carried out with Qidashan concentrator at the temperature of 21 ℃， and good indexes of 68.16% of total iron grade and 89.93% of iron recovery were obtained eventually.

Key words: quartz, hornblende, branching surfactant, contact angle, surface tension, quartz crystal microbalance-dissipative