中文摘要：

高纯度且水溶性好的Al13固体特别是具有一定构型的Al13晶体的制备，对于研究Al13的结构、生成和转化机理、絮凝应用等具有重要的意义。分别采用乙醇-二氧六环沉淀法、乙醇-四氢呋喃沉淀法、乙醇-甲基异丁基甲酮沉淀法对微量加碱法制备的聚合氯化铝溶液进行了纯化，并采用Al-Ferron逐时络合比色法、^27Al—NMR法和电子扫捕显微镜（sEM）对所得到的Al13固体进行了分析表征。结果表明乙醇-二氧六环沉淀法操作最简便，得到的Al13固体纯度最高晶型最规则，Alb含量达到93．5％，Al13含量达到94．6％，呈规则的八面体构型。

英文摘要：

This paper described a laboratory experiment for purifying of poly-aluminium chloride （PAC） which is one of the commonly-used flocculants for water/wastewater treatment. Three methods were used respectively in the experiment, i.e. ethanol-dioxane precipitation, ethanol-tetrahydrofuran precipitation and ethanol-methylisobutylketone precipitation. The purification using the above methods all ended with Al13 solid which then underwent the characterization by Al-Ferron timed complexation colorimetry, 27Al-NMR spectroscopy and SEM. The experimental results showed that, among the others, the purification method of ethanol-dioxane precipitation was the best, featuring easiness in operation, high purity of crystal Al13 produced with the excellent regularity of octahedral configuration, in which the content of Alb was 93.5% and content of Al13 94.6%.