Inorganic Chemicals Industry >
Study on pyrolysis process of Mg（NO3）2·nH2O
Received date: 2021-02-24
Online published: 2021-12-16
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
Xue CHEN , Menghui ZHANG , Liang ZHAO , Hui DONG , Dexi WANG . Study on pyrolysis process of Mg（NO3）2·nH2O[J]. Inorganic Chemicals Industry, 2021 , 53(12) : 91 -94 . DOI: 10.19964/j.issn.1006-4990.2021-0113
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