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http://dx.doi.org/10.22807/KJMP.2020.33.1.29

Effects of Temperature on The Crystallization and Structural Stability of Struvite (MgNH4PO4·6H2O)  

Lee, Seon Yong (Department of Earth and Environmental Sciences, Korea University)
Chang, Bongsu (Department of Earth and Environmental Sciences, Korea University)
Kng, Sue A (Department of Earth and Environmental Sciences, Korea University)
Lee, Young Jae (Department of Earth and Environmental Sciences, Korea University)
Publication Information
Korean Journal of Mineralogy and Petrology / v.33, no.1, 2020 , pp. 29-39 More about this Journal
Abstract
A series of struvite (MgNH4PO4·6H2O) was synthesized and dried at various temperatures (15-60℃). Crystallization of struvite and its structural properties were significantly influenced by synthetic and drying temperature. Struvite was favorably formed at synthetic temperatures ≤30℃ with an inverse relationship between the crystallinity and synthetic temperature. The crystallinity of struvite was also significantly reduced by an increase in drying temperature from 45℃ to 60℃ due to the loss of structural water molecules and ammonium ions by the facilitated thermal decomposition. However, struvite formed at lower synthetic temperature showed higher crystallinity, and its amorphization by thermal decomposition was inhibited. These results demonstrate that struvite formed at low temperature with an stable condition thermodynamically through favorable crystallization shows high crystallinity and stability with respect to the structural and thermal resistance.
Keywords
phosphates; struvite; crystallization; structural stability; temperature;
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