水合硝酸镁热解过程研究

doi:10.19964/j.issn.1006-4990.2021-0113

Abstract

Abstract:

Mg（NO₃）₂·nH₂O is a by-product produced in the nitric acid hydrometallurgical process of laterite nickel ore.Its resource utilization is one of the key links in the green hydrometallurgical process chain.MgO can be obtained by pyrolysis of Mg（NO₃）₂·nH₂O,which is the most potential development direction of its resource utilization.Therefore,stable magnesium nitrate hydrate Mg（NO₃）₂·6H₂O was used as experimental material,and the basic pyrolysis process was studied by means of TG-DTG,TG-FTIR,XRD and DSC,in order to provide theoretical support for the determination of process parameters of magnesium nitrate hexahydrate.The research results showed that the pyrolysis process of Mg（NO₃）₂·nH₂O could be divided into two stages: dehydration and decomposition.The dehydration process was divided into two stages：Mg（NO₃）₂·6H₂O lost four crystal water to form Mg（NO₃）₂·2H₂O at 68~170 ℃;Mg（NO₃）₂·2H₂O lost two crystal water to form Mg（NO₃）₂ at 170~389 ℃.Decomposition process：Mg（NO₃）₂ was decomposed into MgO,NO₂ and O₂ at 389~510 ℃.Mg（NO₃）₂·6H₂O pyrolysis was an endothermic reaction,and its reaction heat was about 940.50 J/g.

Key words: Mg（NO₃）₂·nH₂O, pyrolysis, resource utilization, dehydration, decomposition

CLC Number:

TQ132.2

CHEN Xue,ZHANG Menghui,ZHAO Liang,DONG Hui,WANG Dexi. Study on pyrolysis process of Mg（NO₃）₂·nH₂O[J]. Inorganic Chemicals Industry, 2021, 53(12): 91-94.

Figures/Tables 7

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References 13

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质量损失阶段	温度区间/℃	质量变化率/%	最大质量损失速率温度/℃	最大质量损失速率/（%·min^-1）
Ⅰ	68~170	31.53	99	4.1
Ⅱ	170~389	15.29	300	1.5
Ⅲ	389~510	38.92	450	7.8

名称	分子式	吸收峰位置/cm^-1	干扰物质
水	H₂O	2 000~2 230	—
		1 270~2 000	NO、NO₂
		3 400~4 000	—
氧气	O₂	分析对称,不吸收	—
一氧化氮	NO	1 899~1 905	H₂O
二氧化氮	NO₂	1 550~1 650	H₂O

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Study on pyrolysis process of Mg（NO₃）₂·nH₂O

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