柠檬酸对蓝晶石浮选行为的影响研究

通过纯矿物浮选试验,研究了柠檬酸对蓝晶石浮选的调整作用。结果表明,在油酸钠浮选体系中,柠檬酸在不同的pH值条件下能不同程度的抑制蓝晶石的上浮,在十二胺浮选体系中,柠檬酸在不同的pH值条件下能不同程度的活化蓝晶石的上浮。利用量子化学计算前线轨道能量和分子动力学模拟研究水和柠檬酸在蓝晶石表面的吸附差异,模拟结果表明柠檬酸与蓝晶石的作用强于水与蓝晶石的作用,通过浮选溶液化学计算,分析了柠檬酸对蓝晶石的调整机理,柠檬酸组分可以与蓝晶石表面的铝离子络合,其中C_6H_7O_7~-和C_6H_6O_7~(2-)的作用效果比C_6H_6O_7~(3-)明显,同时增强了蓝晶石表面的负电性,抑制油酸钠在蓝晶石表面的吸附,而有利于十二胺在蓝晶石表面的吸附。

Effects of Citric Acid on Flotation Behavior of Kyanite

The regulation effects of citric acid on kyanite flotation were studied by flotation tests of single minerals. The results showed that in a wide range of pH value, citric acid had a depression performance on kyanite at different degree in sodium oleate system, but it had an activation effect in lauryl amine system. The adsorption energy of water with kyanite and citric acid with kyanite has been calculated by quantum chemical calculations and molecular dynamics simulation method. The conclusion was that the interaction between citric acid and kyanite was stronger than that between water and kyanite. The regulation mechanism of citric acid on kyanite was analyzed by the chemical calculation of flotation solution. The citric acid component can chelate with aluminum ions on the surface of kyanite, and it can improve the electrone gativity of kyanite surface, and the effect of C₆H₇O_7- and C₆H₆O_72- is significantly higher than C₆H₆O_73-. So it can prevent the sodium oleate to adsorb, and was benefit for the adsorption of lauryl amine on kyanite surface.