【摘要】 以CaO为碱化剂采用一次加碱法合成了高浓度聚合氯化铝 (PAC) ,研究了其反应特性及产品的铝形态分布与转化规律 .结果表明 ,CaO特殊的水化反应可使PAC达到较高浓度和较高B值 ,PAC最高浓度可达 2 1mol/L ,B值为 2 1 .合成过程中无论高铝浓度体系还是低铝浓度体系 ,均存在一最佳B值 ,此B值下产品的Alb 含量最高 .最佳B值和最高Alb 含量均随总铝浓度的升高而降低 .B值小于最佳B值时 ,总反应主要表现为生成Alb;B值大于最佳B值时 ,总反应表现为生成Alc.更多还原

【Abstract】 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 (Al T) 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 Al b content is the highest. The optimal B value and the highest Al b content drops with the increasing of Al T. The predominant reaction is the formation of Al b if B is less than the optimal B value, and the formation of Al c if B is more than the optimal B value.更多还原