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采用纯矿物浮选实验、动电位测试、红外光谱检测以及密度泛函理论计算研究了1-羟基-2-甲基-2-烯辛基膦酸(HEPA)对锡石的浮选行为及吸附机理。浮选实验结果表明,相比苯乙烯膦酸(SPA),HEPA具有出更强的捕收性能。当HEPA浓度为50mg/L时,在pH2-9范围内锡石回收率都保持在90%以上。动电位测试和红外光谱检测结果表明,HEPA在锡石表面的吸附主要是通过HEPA单阴离子与锡石表面的锡原子形成化学吸附。密度泛函计算结果表明,HEPA单阴离子比SPA单阴离子具有更高的HOMO能量和对锡石更强的吸附力,这为浮选实验和动电位测试中HEPA的更强捕收力提供了有力证明。
The flotation behavior and adsorption of 1-hydroxy-2-methyl-2-enylphosphonic acid (HEPA) on cassiterite were investigated by pure mineral flotation, potentiodynamic test, infrared spectroscopy and density functional theory mechanism. The results of the flotation experiments show that HEPA possesses a much better harvesting performance than styrene-vinyl phosphonic acid (SPA). When HEPA concentration was 50mg / L, the recovery rate of cassiterite was above 90% in the range of pH2-9. The results of potentiodynamic test and FTIR showed that the adsorption of HEPA on the surface of cassiterite was mainly caused by the chemisorption of HEPA monoanion and tin atom on the surface of cassiterite. The results of density functional calculations show that HEPA monoanion has higher HOMO energy and stronger adsorption capacity to cassiterite than SPA monoanion, which provides a strong force for the stronger catching force of HEPA in the flotation and potentiodynamic tests prove.