论文部分内容阅读
通过方解石单矿物浮选试验,研究了不同浓度碳酸根离子以及矿浆pH值对方解石浮选速率的影响,结果表明:加入1.5mmol/L碳酸根离子时,方解石完全上浮的时间由原来的2min缩短至30s,浮选速率显著提高,而pH值对其浮选速率无显著影响.利用ζ-电位测定、溶液化学计算以及颗粒间相互作用原理,探讨了碳酸根离子影响方解石浮选速率的作用机理,结果表明:碳酸根离子在方解石表面发生静电吸附,生成碳酸钙沉淀,中和了颗粒表面电性,方解石颗粒间的静电排斥力减小,颗粒间的两种吸引力即范德华作用力和疏水作用力占主导地位,颗粒相互吸引靠拢产生聚沉,颗粒更易于向气泡附着,使得方解石浮选速率显著提高.
The effects of different concentrations of carbonate ions and pH value on the flotation rate of calcite were studied by calcite single mineral flotation test. The results show that when 1.5 mmol / L carbonate ion is added, the calcite full floating time is shortened from the original 2 min At 30 s, the flotation rate increased significantly, but the pH value had no significant effect on the flotation rate. The mechanism of the carbonate ions affecting the flotation rate of calcite was discussed by using the ζ-potential measurement, the solution chemistry calculation and the interparticle interaction theory The results show that the carbonate ions are electrostatically adsorbed on the surface of calcite to form calcium carbonate precipitate which neutralizes the electrical properties of the particles. The electrostatic repulsive force between calcite particles decreases. The two attractive forces between particles are van der Waals forces and hydrophobicity The dominant force, the particles attract each other closer together to produce precipitation, the particles are more likely to bubble adhesion, making the calcite flotation rate increased significantly.