The acidic wastewater produced by the wet production of activated clay contains valuable components such as iron and aluminum. The precipitation method was successfully introduced to separate iron and aluminum from the activated clay production wastewater step by step, which can not only recover the valuable components, but also avoid environmental pollution. In the separation process, gypsum, iron aluminum phosphate, alumina, and sodium sulfate were prepared, and the phase compositions of separation products were analyzed by XRD and IR. The main influencing factors in the separation of iron and aluminum components were studied by single factor experiment. The results show that at the optimized conditions, phosphorus/iron molar ratio 6.0, the system pH 3.0, the reaction temperature 343 K, and the reaction time 90 min, the iron( iii ) ion in the system can form a sodium-containing aluminum iron phosphate double salt, and the filtrate after separating Fe 3+ and part of Al 3+ can meet the requirements for forming high-purity Al 2 O 3 . During the phosphate precipitation process, the hypothesis should be correct that Al 3+ reacts with PO43−{\text{PO}}_{4}^{3-} to form an AlPO 4 skeleton, Fe 3+ isomorphically replaces Al 3+ in the [AlO 4 ] tetrahedron, and adsorption occurs simultaneously, with Na + occupying the terminal acid sites, P(Al)–OH.

中文翻译：

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活性黏土生产废水中有价值成分的分离新方法

通过湿法生产活性粘土产生的酸性废水包含有价值的成分，例如铁和铝。成功地采用了沉淀法，从活性黏土生产废水中逐步分离出铁和铝，不仅可以回收有价值的成分，而且还可以避免环境污染。在分离过程中，制备了石膏，磷酸铁铝，氧化铝和硫酸钠，并通过XRD和IR分析了分离产物的相组成。通过单因素实验研究了铁铝成分分离的主要影响因素。结果表明，在最佳条件下，磷/铁摩尔比为6.0，体系pH为3.0，反应温度为343 K，反应时间为90 min，该体系中的铁离子可以形成含钠的磷酸铝铁复盐，分离出Fe 3+和部分Al 3+后的滤液可以满足形成高纯度Al 2 O 3的要求。在磷酸盐沉淀过程中，关于Al 3+与PO43-{\ text {PO}} _ {4} ^ {3-}反应形成AlPO 4骨架，Fe 3+同构替代Al 3+的假设应该是正确的。在[AlO 4]四面体中，吸附同时发生，其中Na +占据末端酸位P（Al）-OH。