微细粒黑钨矿疏水絮凝浮选中聚团形成机制

Flocs Formation Mechanism in Hydrophobic Flocculation Flotation of Fine Wolframite

通过疏水絮凝实验、原子力显微镜分析和数值模拟计算等方法,系统研究了微细粒黑钨矿的疏水聚团形成机制.结果表明:pH为8.0~8.5时,油酸钠诱导黑钨矿表面疏水并产生疏水絮凝行为,微细粒黑钨矿疏水聚团D 50与油酸钠的质量浓度和搅拌强度正相关;油酸钠体系中黑钨矿颗粒间具有较强的黏附力,疏水作用力是疏水聚团形成的主要贡献成分;搅拌装置中形成的强湍流流场环境有助于矿物颗粒的相互接触与能量传递,增加颗粒碰撞黏附概率;在流场高剪切力和油酸钠诱导疏水力共同作用下促进了微细粒黑钨矿形成大而稳固的聚团,与常规浮选相比,疏水絮凝浮选WO 3回收率提高了12.04%.

The flocs formation mechanism of fine wolframite is systematically studied by hydrophobic flocculation experiments,atomic force microscope analyses,and numerical simulations.The results show that sodium oleate induces the surface hydrophobicity of wolframite and further generate hydrophobic flocculation within pH 8.0~8.5,and the apparent particle size D 50 of the hydrophobic flocs of fine wolframite is positively correlated with sodium oleate concentration and stirring strength.There is a strong adhesion force between wolframite particles in the sodium oleate system,and the hydrophobic force is the main contribution component to the formation of hydrophobic flocs.The strong turbulent fluid environment formed in the stirring device contributes to the mutual contact and energy transfer of mineral particles,increasing the particle collision adhesion probability.The combination of high shear force and sodium oleate induced hydrophobic force can promote the formation of large and stable flocs of fine wolframite.The WO 3 recovery in the hydrophobic flocculation flotation of wolframite slimes increases by 12.04%compared with the conventional flotation.