Dehydration characteristics of struvite-K pertaining to magnesium potassium phosphate cement system in non-isothermal condition

Zhang S.; Shi H.-S.; Huang S.-W.Zhang P.

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Dehydration characteristics of struvite-K pertaining to magnesium potassium phosphate cement system in non-isothermal condition

机译：Dehydration characteristics of struvite-K pertaining to magnesium potassium phosphate cement system in non-isothermal condition

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摘要

Struvite-K (KMgPO_4·6H_2O) is the main hydration product of magnesium potassium phosphate cement. Its thermal stability is critical to the properties of magnesium potassium phosphate cement. Therefore, in this study, the dehydration behavior of struvite-K was investigated at N _2 atmosphere in non-isothermal condition. The process was conducted and controlled in a simultaneous TG/DTA analyzer, at heating rates of 2, 5, 10, 15, and 20 K min~(-1). The residual mass was always around 58.5 of the initial one, regardless of the heating rate, which corresponds to the dehydration reaction through one step, KMgPO_4·6H_2O → KMgPO_4. The activation energy (E _a) corresponding to the dehydration of struvite-K was evaluated by non-isothermal kinetic analysis based on the application of isoconversional methods (Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose methods). The calculated results show that Flynn-Wall-Ozawa has slightly higher values of activation energy (E _a) and correlation coefficients (R ~2). Both methods have been proved to be suitable for analyzing dehydration behavior of struvite-K.

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来源
《Journal of thermal analysis and calorimetry》 |2013年第1期|35-40|共6页
作者
Zhang S.; Shi H.-S.; Huang S.-W.Zhang P.;
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作者单位

Key Laboratory of Advanced Civil Engineering Materials, Tongji University, Ministry of Education, Shanghai 200092, China;

School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China;

Key Laboratory of Poyang Lake Environment and Recourse Utilization, Nanchang University, Ministry of Education, Nanchang 330031, China;

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正文语种英语
中图分类物理化学（理论化学）、化学物理学;
关键词
Dehydration characteristics; Magnesium potassium phosphate cement; Non-isothermal kinetics; Struvite-K; TG/DTA;

Dehydration characteristics of struvite-K pertaining to magnesium potassium phosphate cement system in non-isothermal condition

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