Synthesis of High-Concentration Polyaluminum Chloride and Its Aluminium Species Distribution and Transformation
高浓度聚合氯化铝的合成及其形态分布与转化规律

Using solid CaO as basification agent, the high concentration polyaluminum chloride (PAC) was prepared by feeding total alkali at a time. The characteristics of the reaction and the distribution and transformation of the aluminium species were also studied. The experimental results show that the distinctive hydration of CaO can contribute to the high concentration PAC whose Al concentration (AlT) and basicity (B) can reach 2.1 mol/L and 2.1 respectively. There is an optimal B value in any concentration of PAC, at which the Alb content is the highest. The optimal B value and the highest Alb content drops with the increasing of AlT. The predominant reaction is the formation of Alb if B is less than the optimal B value, and the formation of Alc if B is more than the optimal B value.