Abstract: Thanks to its high cagelike structure and specific surface, sodalite exhibit strong adsorption capacity. In this study, the hydroxysodalite was synthesized by alkali leaching with metakaolinite and NaOH as raw materials, and the impact of NaOH concentration, reaction temperature, reaction time and liquid to solid ratio on the synthesized sodalite was discussed. Furthermore, the product in alkali dissolving process was characterized by XRD, SEM, IR and NMR, and the adsorption properties of sodalite to Al3+ were analyzed. The results indicated that the reaction temperature showed the most notable impact on the synthesis of sodalite, followed by NaOH concentration, and the impact of liquid to solid ratio was the least. With the temperature and the concentration of NaOH increasing,the reaction time can be reduced. During the alkali leaching process, the active aluminum and silicon of metakaoli-nite would be dissolved in NaOH at first. With the advance of reaction, polycondensation would take place to form the precursor gelatinization phase when the aluminum and silicon reached a certain concentration in the solution. The concentration of NaOH played a significant role in the transformation of precursor gelatinization phase, the gelatinization phase would mainly transform to zeolite phase at low concentration, while sodalite phase at high concentration. The essence is that zeolite phase in metastable state would react with NaOH and transform to sodalite phase. The experiment of adsorption characteristics indicated that the adsorption of sodalite to Al3+ conformed to Langmuir model, with the maximum adsorption rate of 99.9% and maximum absorption capacity of 89.77 mg/g.
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2018, Vol. 32 
