(1. 中國(guó)地質(zhì)大學(xué)(武漢) 材料與化學(xué)學(xué)院，武漢 430074；
2. 中國(guó)地質(zhì)大學(xué)(武漢) 教育部納米礦物材料及應(yīng)用工程研究中心，武漢 430074)
摘 要: 以新型改性脂肪酸Dd-21為捕收劑，考察Tween-80對(duì)低品位碳酸錳礦浮選的增效作用。通過Zeta電位、液體表面張力、紅外光譜及量子化學(xué)計(jì)算，研究Tween-80的增效機(jī)理。結(jié)果表明：Tween-80能顯著提高新型改性脂肪酸Dd-21對(duì)碳酸錳礦的捕收性能；當(dāng)捕收劑Dd-21與Tween-80的質(zhì)量比為3:1時(shí)，錳品位為10.69%的原礦，通過一次粗選工藝，浮選回收率為84.17%，精礦品位達(dá)16.32%。Tween-80的加入使溶液的表面張力降低，促進(jìn)Dd-21在碳酸錳礦表面的吸附，使礦物表面的動(dòng)電位降低；Tween-80和Dd-21在礦物表面產(chǎn)生了共吸附；Tween-80分子具有較大的偶極矩，氧原子上集中了較多的負(fù)電荷。分子中酯基部分和長(zhǎng)鏈脂肪烴部分能分別以氫鍵與水作用、以范德華力與Dd-21的鏈烴基作用，分別發(fā)揮“親水端”和“親油端”的作用，增大Dd-21在水中的溶解度。
關(guān)鍵字: 碳酸錳；改性脂肪酸；浮選；Tween-80；增效作用
（1.Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China;
2. Engineering Research Center of Nano-Geo Materials,
Ministry of Education, China University of Geosciences, Wuhan 430074, China）
Abstract:The synergistic effect of Tween-80 on modified fatty acid collector Dd-21 was investigated considering the flotation of low grade manganese carbonate. The synergistic mechanism was studied by the surface tension test, Zeta potential test, FTIR spectroscopy and quantum calculation. A concentrate with 84.17% recovery rate and 16.32% manganese grade is obtained from the raw ore with 10.69% manganese through one rougher flotation when the mass ratio of Dd-21 to Tween-80 is 3:1. The addition of Tween-80 would reduce the surface tension, promote the adsorption of Dd-21 on the surface of ore and reduce the Zeta potential. The co-adsorption between collector and Tween-80 exists on the surface of manganese carbonate. The strong dipole is found in Tween-80 and the negative charge focuses on the oxygen atoms. The hydrogen bond between oxygen and water, van der Waals interaction between the carbon chain in Tween-80 and carbon chain in Dd-21 would account for the solubilization of Dd-21 in water.
Key words: manganese carbonate; modified fatty acid; flotation; Tween-80; synergistic effect
