含铝废液制备超细硅酸铝中除杂机理探讨

为了除去含铝废液制备超细硅酸铝体系中存在的镁、铁等杂质,本研究基于对离子水解反应的理论分析,通过控制溶液中离子浓度和酸碱度达到除杂目的,并根据样品的化学成份检测结果考察除杂效果.结果表明,陈化pH 值控制在 4.0 左右可以保证铝、硅进入沉淀相,而镁留在液相中洗涤除去.Fe3+ 的存在将难以去除,因此在反应聚合过程中加入少量铝片,防止Fe2+ 的氧化,洗涤除去 Fe2+,从而达到除铁的目的.除杂后所得目标样品中Fe3+ 含量仅为0.037%,Al2O3 和 MgO 的含量也可达到标准要求.

Study on the Impurity Removing Mechanism during Preparation of Super Fine Aluminum Silicate from Waste Bearing Aluminum

Based on analysis of ionic hydrolyzed reactions, the impurity of Mg and Fe which exists in the process of preparation of super fine aluminum silicate from waste bearing aluminum was removed in this study. It carried out by controlling ion concentration as well as acidity and alkalinity. The impurity removing effect was detected by the results of chemical ingredient analysis. The results show that Si and Al can be held in sedimentary phase when the aging pH value is turned into about 4.0. Furthermore, Mg can be removed by washing for its remaining in the liquid. Fe3 would be difficult to remove if it existed in the system. Therefore, Fe removing can be achieved by adding pieces of Al in aging process for that it stops the oxidation of Fe2 . The Fe3 content of the object product is about 0.037% after impurity removing. The contents of Al2O3 and MgO are also up to the current-enterprise standard of super fine aluminum silicate.