聚硅硫酸铝的合成及在含油废水中的应用

The Preparation Of Poly-silicate-aluminum-sulfate and Their Application in Oily Wastewater Treatment

通过铝盐引入聚硅酸中的方法,制备了复合无机高分子絮凝剂聚硅硫酸铝(PSAS).考察了n(Al):n(Si)、熟化温度、pH值及硅酸钠的浓度对絮凝效果的影响.结果表明,制备PSAS的最佳条件是,n(Al):n(Si)=1:1,反应温度为45℃,w(硅酸钠)=15%,pH=1～4.PSAS和聚合氯化铝(PAC)对长庆油田污水进行的絮凝对比实验表明,PSAS具有较好的絮凝除油效果.

By the method of introducing aluminum to polysilicic acid, compound inorganic polymer coagulants which named polymer coagulant poly-aluminum silicate-sulphate （PSAS） has prepared. The effect of different tool ratio of AI/Si, curing temperature, pH value and the concentration of sodium silicate on the flocculation performance were investigated through the experiment. The best preparation conditions of PSAS were summarized as the following： the optimal mol ratio of AI/Si is 1：1, the reaction temperature is 45 ℃, the concentration of sodium silicate is 15%, and its pH value is 1--4. Comparative experiments were conducted on the sewage from Changqing oil field using PSAS and poly-aluminum-chloride （PAC） separately, and PSAS has good degreasing effect of floeculation.