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硅酸聚合度对聚硅氯化铝絮凝特征的影响 被引量:6

Effect of the Silicic Acid Polymerization Degree on the Coagulating Property of Polyalumium Silicate Chloride
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摘要 聚硅酸铝盐是一类新型无机高分子絮凝剂 ,是在聚硅酸和聚铝絮凝剂的基础上发展起来的复合产品。以蒸馏水稀释硅酸钠至含SiO2 3.0 % ,用硫酸调节pH值至 4 .5 ,放置不同时间使其聚合 ,得到不同聚合度聚硅酸。以制备得到的聚硅酸和氯化铝为原料 ,通过共聚法制备了不同硅酸聚合度、碱化度(B)、铝硅摩尔比 (Al Si)的聚硅氯化铝 (PASC)絮凝剂。采用Al-Ferron逐时络合比色法 ,测定了絮凝剂水解铝的形态分布特征 ,研究了其影响因素 ,分析探讨了不同聚合度的硅酸与铝水解聚合产物间的相互作用。将其用于商品砼废水的处理 ,当硅酸聚合时间为 14 5min时 ,所制备的聚硅氯化铝 (PASC)絮凝剂的除浊率高达 97%。 Polyaluminum silicate is a new type of inorganic macromolecular flocculants, which is developed as a complex product in recent years on the base of polyalumium flocculant and polysilicic acid flocculant. Sodium silicate is diluted to the concentration of 3.0% SiO 2 with distilled water. The solution was adjusted to pH 4.5 with sulphate acid and kept at quiescency for different time to get polysilicic acid with different polymerization degrees. Using polysilicic acid prepared and aluminium chloride as materials, a series of polyaluminium silicate chlorides(PASC) with different basicities(B), Al/Si molar ratios and polymerization degree of silicic acid are prepared by copolymerization technique. The Al-Ferron timed complex colorimetric method is applied to characterize species distribution of PASC and to study its influence factors. The interaction between hydrolyzed aluminum species and polysilicic acid with different polymerization degrees in PASC is discussed.The flocculant prepared is applied to the treatment of commercial concrete wastewater. The turbidity removal of commercial concrete wastewater is up to 97% when a PASC, prepared with polysilicic acid of 145 min polymerization degree.
出处 《重庆大学学报(自然科学版)》 EI CAS CSCD 北大核心 2002年第12期145-147,共3页 Journal of Chongqing University
关键词 絮凝特征 聚硅氯化铝 硅酸聚合度 Al-Ferron逐时络合比色法 铝形态分布 絮凝剂 废水处理 polyaluminum silicate chlorides(PASC) silicic acid polymerization degree Al-Ferron timed complex colorimetric method Al species distribution
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