【摘要】 脂肪酸及其盐类捕收剂在低温下溶解性和分散能力较差，限制了其在冬季的应用效果。本文采用绿色环保药剂聚乙二醇2000(PEG-2000)与油酸钠(NaOL)形成的组合捕收剂，开展了白钨矿的低温浮选试验。浮选试验表明，在低温(5℃)条件下，添加PEG-2000可以显著提高NaOL对白钨矿的捕收能力，在同等捕收剂用量下，采用组合捕收剂时白钨矿的回收率比单一使用NaOL高4.39%。通过表面张力测试、红外光谱分析以及zeta电位测试发现，在低温环境下，PEG-2000与OL~-在白钨矿表面发生共吸附，且PEG-2000的存在促进了油酸离子(OL~-)在白钨矿表面吸附浓度的增加，其原因是PEG-2000对OL~-基团之间的静电斥力有屏蔽作用，改变了OL~-在溶液体系中的胶束构型，使OL~-在白钨矿表面聚集更加紧密，导致其疏水性增强。这一发现为低温环境下高效浮选回收白钨矿的捕收剂开发工作提供了参考。更多还原

【Abstract】 The reduced ability of fatty acids to dissolve and disperse at low temperatures limits their effectiveness in winter applications. In this study, a green and environment-friendly reagent, polyethylene glycol 2000(PEG-2000), was used to evaluate its effect on the collecting performance of sodium oleate during scheelite flotation at low temperatures.The effect of PEG-2000 on the flotation of scheelite with the collector sodium oleate(NaOL) was studied by flotation tests, surface tension tests, infrared spectral analysis, and zeta potential measurements. Flotation tests showed that adding PEG-2000 can enhance the collecting ability of NaOL on scheelite at low temperature(5 ℃). The recovery of scheelite with the mixed collector of PEG-200 and NaOL is 4.39% higher than that with NaOL only. The surface tension tests,infrared spectral analysis and zeta potential measurements revealed that PEG-2000 and OL~-are co-adsorbed on the scheelite surface at low temperatures. The presence of PEG-2000 promoted the increase of the adsorption concentration of oleate ions(OL~-) on the scheelite surface. The reason was that PEG-2000 has a shielding effect on the electrostatic repulsion between the OL~-groups, which changes the micellar configuration of OL~-in the solution system and makes the OL~-gather more tightly on the surface of scheelite, leading to the enhancement of its hydrophobicity. This discovery provides a reference for the development of collecting reagents for efficient flotation recovery of scheelite under low temperature environment.更多还原