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Preparation method of magnesium nitrate and magnesium nitrate-based multi-element molten salt

A technology of magnesium nitrate and magnesium nitrate hexahydrate, applied in the directions of magnesium nitrate, chemical instruments and methods, heat exchange materials, etc., can solve the problem of lowering decomposition temperature of magnesium nitrate and magnesium nitrate-based multicomponent molten salt, high content of basic magnesium nitrate, High dehydration temperature and time, etc., to achieve the effect of less content, reduced hydrolysis side reactions, and low dehydration temperature

Pending Publication Date: 2022-04-08
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing dehydration technology of magnesium nitrate hexahydrate requires high dehydration temperature and time, and the content of basic magnesium nitrate in the dehydration product is high, which leads to a decrease in the decomposition temperature of the prepared magnesium nitrate and magnesium nitrate-based multi-element molten salt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put the container containing magnesium nitrate hexahydrate into a vacuum-heatable muffle furnace, control the vacuum at -0.05MPa, then raise the temperature to 300°C at a rate of 10°C / min, heat at 300°C for 0.5h, take it out and place it Grind and sample for Mg analysis in a sealed glove box 2+ content. After testing, the basic magnesium nitrate content is 3.5%, and the magnesium nitrate content is 96.5%. After testing, the decomposition temperature of the sample was 390.6°C.

Embodiment 2

[0031] Put the container containing magnesium nitrate hexahydrate into a vacuum-heatable muffle furnace, control the vacuum at -0.1MPa, then raise the temperature to 150°C at a rate of 1°C / min, heat at 150°C for 12h, take it out in gloves Chamber grinding and sampling for Mg analysis 2+ content. After testing, the basic magnesium nitrate content is 2.8%, and the magnesium nitrate content is 97.2%. After testing, the decomposition temperature of the sample was 391.5°C.

Embodiment 3

[0033] Put the container containing magnesium nitrate hexahydrate into a vacuum drying oven that can be heated in vacuum, the vacuum degree is controlled at -0.06MPa, then raise the temperature to 250°C at a rate of 5°C / min, heat at 250°C for 2h, take it out in gloves Chamber grinding and sampling for Mg analysis 2+ content. After testing, the basic magnesium nitrate content is 3.2%, and the magnesium nitrate content is 96.8%. After testing, the decomposition temperature of the sample was 390.9°C.

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Abstract

The invention discloses a preparation method of magnesium nitrate and magnesium nitrate-based multi-element molten salt. The method comprises the following steps: putting an open container containing magnesium nitrate hexahydrate or a mixture containing magnesium nitrate hexahydrate multi-element molten salt into a heating device, and carrying out vacuum heating dehydration; and putting the dehydrated product into a water-free and oxygen-free glove box, and crushing to obtain the magnesium nitrate or magnesium nitrate-based multi-element molten salt. According to the preparation method provided by the invention, the content of basic magnesium nitrate in magnesium nitrate and magnesium nitrate-based multi-element molten salt can be effectively reduced, high-purity magnesium nitrate or magnesium nitrate-based multi-element molten salt can be obtained at a relatively low temperature within a relatively short time, and meanwhile, the obtained magnesium nitrate or magnesium nitrate-based multi-element molten salt has a relatively high decomposition temperature.

Description

[0001] The present invention is a divisional application with the application number 201910485889.X, the application date is June 5, 2019, and the title of the invention is "A Preparation Method for Magnesium Nitrate and Magnesium Nitrate-based Multi-element Molten Salt". technical field [0002] The invention relates to the field of nitric acid molten salts, in particular to a preparation method of magnesium nitrate and magnesium nitrate-based multi-element molten salts. Background technique [0003] With the continuous growth of energy demand, it has brought opportunities and challenges for the development of clean energy such as nuclear energy and solar energy. Whether it is nuclear energy or solar energy, heat transfer and storage media are inseparable. A heat transfer medium with good performance can not only ensure the efficient transmission and utilization of heat, but also improve the safety factor of the entire heat transfer system. [0004] Molten salt (referred t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/38C09K5/12
CPCC01F5/38C09K5/12
Inventor 王敏钟远李锦丽
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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