(中南大學(xué) 資源加工與生物工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 在一水硬鋁石的單礦物浮選中，采用油酸為捕收劑，考察增效劑吐溫-20對(duì)捕收劑油酸的增效作用。通過(guò)溶液化學(xué)分析、吸附量測(cè)定、動(dòng)電位的測(cè)試及液體表面張力的測(cè)試等方法揭示了吐溫-20的增效機(jī)理。結(jié)果表明：低濃度的增效劑吐溫-20能提高油酸的浮選性能，浮選回收效率提高12%左右；增效劑的增加順序影響油酸的浮選性能，預(yù)先混勻油酸與添加劑的添加方式最佳，油酸與增效劑的最佳質(zhì)量比為30:1；在pH=9左右，油酸鈉以酸-皂聚合體HOl·Ol-與礦物表面作用，因此，其浮選性能及其溶解度與表面活性有關(guān)。動(dòng)電位測(cè)試表明，增效劑促進(jìn)了油酸在礦物表面的吸附，使礦物表面的動(dòng)電位降低。溶液的表面張力測(cè)定顯示，增效劑的加入使油酸的臨界膠束濃度(cMC)降低，相當(dāng)于降低了藥劑的作用濃度。吸附量檢測(cè)表明，表面活性劑促進(jìn)了油酸在礦物表面的吸附，使油酸的吸附量增加。
關(guān)鍵字: 一水硬鋁石；油酸；浮選；Tween-20；增效劑
（School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:In single mineral flotation of diaspore, with the oleic acid as collector, the synergistic effect of Tween-20 on the collector was studied. Testing methods of solution chemistry analysis, determination of adsorption and potentiodynamic test, the solution surface tension test reveals the enhancement mechanism of Tween-20. The experimental results show the potentiator has a marked influence on the recovery of diaspore, which is raised by 12% and the addition sequence also affects the flotation behavior. The reagents should be mixed thoroughly before addition and the best mass ratio of collector oleic acid to potentiator Tween-20 is 30:1. At pH 9, sodium oleate acts with the surface of mineral, at the form of acid-soap polymer [HOl·Ol-]. Zeta potential test shows that the potentiator promotes the absorption of collector on the mineral surface, which lowers the Zeta potential. The surface tension experiments results show that the addition of potentiator Tween-20 lowers the cMC value of oleic acid solution, thus resulting in decreasing the agent concentration. By the adsorptive capability tests, with the increasing addition of the Tween-20, the adsorption of oleic acid on diaspore increases.
Key words: diaspore; oleic acid; flotation; Tween-20; potentiator
