含钙矿物浮选过程中Ca-油酸胶体捕收剂的作用机理

The Action Mechanism of Ca-oleate Colloid Collector During the Flotation of Calcium-Containing Minerals

研究了油酸钠浮选白钨矿、萤石和方解石过程中Ca-油酸[Ca(OL)_(2)]胶体的存在及其对浮选的影响。溶液化学计算表明,三种含钙矿物溶解的钙离子可以与油酸阴离子反应生成Ca(OL)_(2)胶体,并且在碱性条件下作为溶液中的主要组分存在和发挥作用。纯矿物试验结果表明,Ca(OL)_(2)胶体对白钨矿和萤石的捕收能力较油酸钠强,对方解石的捕收能力较油酸钠弱。Ca(OL)_(2)胶体吸附后的三种矿物表面疏水性差异增大,白钨矿、萤石表面疏水性强于油酸钠作用后,而方解石表面疏水性弱于油酸钠作用后。Ca(OL)_(2)胶体在白钨矿表面发生化学吸附,在萤石和方解石表面以化学吸附为主,当pH<9.0时存在一定的静电吸附作用。油酸钠浮选含钙矿物过程中除油酸阴离子直接作用于矿物表面的路径外,存在另外一种重要的作用路径:钙离子与油酸阴离子在溶液中首先生成Ca(OL)_(2)胶体,Ca(OL)_(2)胶体在溶液中迁移至矿物表面发生吸附。

The existence of Ca-oleate Ca(OL)_(2) colloid and its effect on flotation during the flotation of scheelite,fluorite and calcite with sodium oleate were studied.Solution chemistry showed that the dissolved calcium ions from the three calcium-containing minerals can react with oleate anions to form Ca(OL)_(2) colloids,which exist and function as the main components in solutions under alkaline conditions.The pure minerals tests showed that the collection ability of Ca(OL)_(2) colloid for scheelite and fluorite was stronger than that of sodium oleate,and for calcite was weaker than that of sodium oleate.The difference in the surface hydrophobicity of the three minerals after Ca(OL)_(2) colloid adsorption increased.The surface hydrophobicity of scheelite and fluorite was stronger than that of sodium oleate,while the surface hydrophobicity of calcite was weaker than that of sodium oleate.Chemical adsorption of Ca(OL)_(2) colloids occurred on the surface of scheelite.On the surface of fluorite and calcite,it was mainly chemical adsorption,and there was also electrostatic adsorption when pH<9.0.In the flotation process of calcium-containing minerals with sodium oleate,in addition to the direct action of oleic acid anions on the surface of minerals,there was another important action path:calcium ions and oleic acid anions first generate Ca(OL)_(2) colloids in solution,and Ca(OL)_(2) colloids migrated to the mineral surface in solution and adsorbed on the minerals surface.