油酸钠与微细粒黑钨矿的作用机理

Interaction Mechanism of Sodium Oleate with Fine Wolframite

通过浮选实验、溶液化学计算、吸附量测试、动电位和红外光谱分析等方法,系统研究了油酸钠对微细粒黑钨矿的浮选捕收机理.结果表明:黑钨矿可浮性与油酸钠吸附量正相关,微细粒黑钨矿可浮性较好的p H区间为7.0~9.0,溶液中油酸离子和离子-分子缔合物组分对黑钨矿浮选过程起主要作用.溶液化学计算表明:油酸钠的吸附量和黑钨矿的可浮性与金属阳离子形成的油酸盐组分浓度有直接关系;油酸钠的添加使荷负电的黑钨矿动电位负移.红外光谱分析表明油酸钠在黑钨矿表面发生化学吸附,生成金属油酸盐,进而增强了黑钨矿的可浮性.

The flotation mechanism of fine wolframite using sodium oleate as the collector was systematically studied through flotation experiments,solution chemistry calculations,adsorption tests,zeta potential measurements and infrared spectroscopic analysis.The flotation results showed that the adsorption of sodium oleate is responsible for the floatability of wolframite,and fine wolframite performs a better floatability at pH 7.0~9.0.In this pH range,the ions and ionmolecular associations of sodium oleate are dominated species,which play a critical role in the flotation of wolframite.Solution chemistry calculations suggest that the adsorption amount of sodium oleate and the floatability of wolframite have a direct relationship with the species concentration of metal oleate precipitates.In the presence of sodium oleate,the zeta potential of wolframite particles shifts negatively.Infrared spectroscopic analysis indicated that sodium oleate chemisorbs onto the wolframite surface,producing metal oleate precipitates,and thus it is contributed to the floatability of fine wolframite.