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|China University of Geosciences, China|
|Posters & Accepted Abstracts: J Material Sci Eng|
|The preparation of leucite from K+/Na+ ions exchange process of analcime in K2CO3 solution was studied. Abundant K+ in leucite after exchange is beneficial for the application in agriculture as slow release fertilizers. This is a good method to translate non water-soluble potassium resources into water-soluble potassium resources. It can solve the problem of the shortage of water-soluble potassium resources. It is also a new and popular way for the preparation of slow release fertilizers. In this study, X-ray diffraction (XRD), Fourier transformation infrared spectrometry (FTIR) and scanning electron microscopy (SEM) were utilized to characterize the as-exchanged samples. Flame photometry was applied to determine the concentrations of potassium oxide. XRD data and FTIR results determined that leucite was prepared from K+/Na+ ions exchange process of analcime in K2CO3 solution at 60ºC, 90ºC and 120ºC for 1 h, 2 h, 4 h, 6 h and 10 h. The crystal structure of analcime and leucite show that potassium atoms surrounded by six oxygen atoms in leucite are located in the sites of water molecule in analcime. The preparation of leucite from analcime in K2CO3 solution is a reversible chemical reaction. The K+/Na+ ions exchange was stabilization at higher temperatures (90ºC and 120ºC) and longer time according to the K2O contents in samples. It turned out that the reaction rate was controlled by product layer diffusion from the experiments and analysis of kinetics according to shrinking core model. It shows that the potassium oxide of samples maximum is 17.10% (in theory is 21.58%) obtained from analcime reacted with 4 mol/L K2CO3 solution (KAlSi2O6/K2CO3 mole ratio=1:10) at 120ºC for 4 h.|
Qianqian Chang is a Post-graduate student at the China University of Geosciences (Beijing) in Material Science and Engineering. Currently, she is working on the preparation of leucite from analcime by ion exchange. Leucite processed in this method is used as a slow release potassium fertilizer. Preparation of leucite from analcime by ion exchange of K+/Na+ is significant for the application of analcime in fertilizers, which can not only supply the necessary potassium element to plants and enhance dissolution of the rock phosphate, but also can reduce the loss of nutrients and water as well as the environmental pollutions compared to traditional chemical fertilizers.
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