CAJ | 학술논문

通过分散实验研究金属阳离子对一水硬铝石分散性的影响,以Zeta电位测试、溶液化学计算和DLVO理论计算分析金属离子对一水硬铝石分散性影响的作用机理.结果表明:金属离子的价态对一水硬铝石分散性的影响大于金属离子的种类,且多价金属离子对一水硬铝石分散性的影响比一价金属离子大.钙、镁离子存在时,当pH小于10,一水硬铝石的分散性不发生改变,但是当pH大于10后,钙、镁离子促使一水硬铝石发生强烈聚沉.钙、镁离子在一水硬铝石上的吸附使双电层厚度减小,从而降低Zeta电位绝对值并导致一水硬铝石颗粒间排斥力减小.当pH为11时,由于颗粒吸附Mg(OH)2(s),在一水硬铝石表面产生一个新的零电点.
통과분산실험연구금속양리자대일수경려석분산성적영향,이Zeta전위측시、용액화학계산화DLVO이론계산분석금속리자대일수경려석분산성영향적작용궤리.결과표명:금속리자적개태대일수경려석분산성적영향대우금속리자적충류,차다개금속리자대일수경려석분산성적영향비일개금속리자대.개、미리자존재시,당pH소우10,일수경려석적분산성불발생개변,단시당pH대우10후,개、미리자촉사일수경려석발생강렬취침.개、미리자재일수경려석상적흡부사쌍전층후도감소,종이강저Zeta전위절대치병도치일수경려석과립간배척력감소.당pH위11시,유우과립흡부Mg(OH)2(s),재일수경려석표면산생일개신적령전점.
Dispersion experiments were conducted to study the influence of metallic cations on the dispersibility of diaspore. The reaction mechanisms were investigated based on the analysis of zeta (ζ) potential and calculations of solution chemistry and DLVO theory. The results show that the valence of cations, instead of the cation type, plays an important role in the dispersibility of diaspore. The impact of multivalent metallic cations is greater than that of monovalent cations. In the presence of Ca2+ and Mg2+, the dispersion of diaspore doesn't change in the range of pH value below 10. However, Ca2+ and Mg2+ may induce strong coagulation of particles when pH value is higher than 10. The adsorption of species of calcium and magnesium ions on diaspore can cause the compression of electric double layer, the decrease of the absolute value of zeta potential and the repulsion force between diaspore particles. The new IEP (isoelectric point) appeared at pH value of 11 may attribute to the adsorption of Mg(OH)2(s).