热分析法研究六水硝酸镁的脱水过程与机理

doi:10.11896/cldb.19120063

Abstract
Figure/Table
References
Related Citation (4)

Download:

Full Text ( PDF ) (3471KB)
Export: BibTeX | EndNote (RIS)

Abstract Magnesium nitrate-based molten salt has a wide application prospect as a medium temperature energy storage material forsolar thermal po-wer generation. The research on the dehydration process and mechanism of magnesium nitrate hexahydrate is of guiding significance for the preparation of magnesium nitrate. The dehydration process and mechanism of magnesium nitrate hexahydrate were studied in this work through simultaneously TG/DSC. The thermodynamic functions of dehydration reaction of magnesium nitrate hexahydrate were calculated. The dehydration products were characterized by XRD, Raman and DSC. The results of calculation show that magnesium nitrate hexahydrate is dehydrated to magnesium nitrate when the temperature is above 168.02 ℃ in standard state. In the process of program heating, first magnesium nitrate hexahydrate is melted to a solution, then magnesium nitrate dihydrate precipitates from the solution as the water loses. This dehydration process can be described according to the phase equilibrium of magnesium nitrate-water solution. Solid magnesium nitrate dihydrate is melted at 130 ℃. The melt is dehydrated to anhydrous magnesium nitrate, which involves a liquid-solid heterogeneous phase reaction. The melt is completely dehydrated to anhydrous magnesium nitrate at higher temperature than the calculated value, indicating that this dehydration reaction is thermodynamically spontaneous.

Key words： magnesium nitrate hexahydrate dehydration thermal analysis thermodynamic calculation

Published: 02 December 2020

CLC number:

TQ13

Fund:This work was financially supported by the National Natural Science Foundation of China (U1707603), Major Science and Technology Projects of Qinghai (2017-GX-A3).

About author:: Yuan Zhonghas been studying for a doctorate in Hebei University of Technology. He is mainly engaged in phase equilibrium and thermodynamic calculation of water-salt systems and molten salt systems.Min Wangis a director, researcher and doctoral supervisor of Qinghai Institute of Salt Lakes, Chinese Academy of Sciences. She has long been engaged in research work on the comprehensive development, utilization and industrialization of potassium, lithium, boron and magnesium resources in Salt Lake.Junsheng Yuanis professor and doctoral supervisor of School of Chemical Engineering, Hebei University of Technology. He has been engaged in the utilization and protection of seawater resources, as well as in wastewater treatment and recycling.

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	ZHONG Yuan
	WANG Min
	YUAN Junsheng

Cite this article:

ZHONG Yuan,WANG Min,YUAN Junsheng. Dehydration Process and Mechanism of Magnesium Nitrate Hexahydrate Using Thermal Analysis Technique[J]. Materials Reports, 2020, 34(22): 22015-22019.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19120063 OR http://www.mater-rep.com/EN/Y2020/V34/I22/22015

Fernandez A G, Cabeza L F.Solar Energy Materials and Solar Cells, 2019, 194, 160.2 Wang M, Li J L, Zhao Y J, et al.Journal of Salt Lake Research, 2018, 26(2), 1 (in Chinese).王敏, 李锦丽, 赵有璟, 等.盐湖研究, 2018, 26(2), 1.3 Zhang H T, Zhao Y J, Zhang P, et al.Materials Reports A: Review Papers, 2015, 29(1), 54 (in Chinese).张宏韬, 赵有璟, 张萍, 等.材料导报:综述篇, 2015, 29(1), 54.4 Bin Mohammad M, Brooks G A, Rhamdhani M A.Metallurgical and Materials Transactions B, 2018, 49(3), 1482.5 Wu Y T, Li Y, Ren N, et al.Solar Energy Materials and Solar Cells, 2018, 176, 181.6 Reddy G R, Wang T, Mantha D. Thermochimica Acta, 2012, 531, 6.7 Wang T, Mantha D, Reddy G R.Thermochimica Acta, 2013, 521, 92.8 Du B Q, Wang H Y, Li J L, et al.Materials Reports B:Research Papers, 2017, 31(9B), 1 (in Chinese).杜宝强, 王怀有, 李锦丽, 等.材料导报:研究篇, 2017, 31(9), 1.9 Wang H C. Preparation and energy storage performance of composite phase change materials containing magnesium chloride hexahydrate-magnesium nitrate hexahydrate eutectic salt. Master's Thesis, South China University of Technology, China, 2016 (in Chinese).王会春. 含六水氯化镁-六水硝酸镁共晶盐的复合相变材料制备及其热特性. 硕士学位论文, 华南理工大学, 2016.10 Drake G, Freiberg L, AuYeung N. Energy Technology, 2018, 6(2), 351.11 Susman M D, Pham H N, Datye A K, et al. Chemistry of Materials, 2018, 30(8), 2641.12 Paulik F, Bessenyey-Paulik E, Walther-Paulik K. Thermochimica Acta, 2005, 430(1-2), 59.13 Odochian L.Journal of Thermal Analysis, 1995, 45(6), 1437.14 Migdal-Mikuli A, Mikuli E, Dziembaj R, et al. Thermochimica Acta, 2004, 419(1-2), 223.15 Paulik F, Paulik J, Arnold M, et al. Journal of Thermal Analysis, 1988, 34(3), 627.16 Gabdullin A N, Molodykh A S, Nikonenko E A, et al. Russian Metallurgy, 2017, (8), 627.17 EwingW W, Rasmussen H E. Journal of the American Chemical Society, 1942, 64, 1443.18 Chang T G, Irish D E. The Journal of Physical Chemistry, 1973, 77(1), 52.19 Feng H Y, Lin X D, Ge Y R, et al.Chinese Journal of Inorganic Chmistry, 2000, 16(1), 89 (in Chinese).冯海燕, 刘晓地, 葛艳蕊, 等.无机化学学报, 2000, 16(1), 89.20 Li W. The thermal kinetics of some metal hydrated salts.Master's Thesis, Nanjing University of Science and Technology, China, 2012 (in Chinese).李稳. 一些无机水合盐的热分解动力学研究. 硕士学位论文, 南京理工大学, 2012.21 Peleg M. Israel Journal of Chemistry, 1973, 11(4), 535.