【摘要】 通过对中等滴碱速度下强制铝盐水解聚合过程中的电位滴定曲线分析 ,提出了临界点的概念。临界点是铝盐水解聚合电位滴定曲线的特征点 ,它与实验条件有关 ,临界点的变化反映了实验条件对铝盐水解聚合过程和羟基铝形态转化的影响。按照OH与Al摩尔比的大小 ,利用铝盐水解聚合电位滴定曲线的3个临界特征点 ,可以将铝的形态变化定量地划分为4个区 :即水解单核铝区(包括Al3 +和单核铝Ala) ;低/中聚合铝区(主要包括Al2～Al12 形态) ;高聚合铝区(主要包括Al13～Al54 形态)和溶胶/凝胶区(Alc 即Al(OH)3形态) ;溶胶/凝胶溶解区(主要形态为Al(OH)4- ) ,从而为研究铝的水解聚合过程提供了定量基础。同时考察了铝浓度、温度、卤素离子、硅酸根、有机酸根等多种因素对铝溶液碱滴定pH～ 曲线及其划分铝形态临界点的影响 ,探讨了这些因素对铝盐水解聚合过程及其形态转化的影响规律 ,为研究各种因素对铝的水解聚合过程的影响提供了一种新思路更多还原

【Abstract】 Acritical point,defined as the characteristic pointofthe potentiometric titration curves ofthe hyˉdrolysis-polymerisationofaluminumsaltsolutions,wasexpoundedthroughanalysingthepotentiometrictitraˉtion curves of the hydrolysis-polymerisation of aluminumsalt solutions under the condition of dripping the base at mediumrate.Itwas found that the effects of the experimental conditions on the processes of the hyˉdrolysis-polymerisation and the conversion of hydroxy polymerized aluminum species could be estimated bythe variations of the critical points.Accordingto the OH/Al mol ratio,and the three characteristic critiˉcal points of the titration curves,the variations of the aluminium species could be divided into four differˉent zones:the Al 3+ /Al a zone,the low/medium polymerized Al zone,the high polymerized aluminum and sol/gel precipitation zone and the sol/gel dissolving zone.drolysis-polymerisation of Al 3+ salt.The efˉfects of total aluminum concentration,temperature,halide ion,silicate radical,and organic acid radical on the potentiometric titration pH～ ⒒ curves and their corresponding critical points for demarcatingthe aluˉminum species were also studied.The results provided a quantitative basis for studying the regular pattern of the hydrolysis-polymerisation of Al 3+ salt and the conversion of the species.更多还原