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

Inactive Publication Date: 2019-07-26
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

[0028] 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

[0030] 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

[0032] 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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PUM

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Abstract

The invention discloses a preparation method of magnesium nitrate and magnesium nitrate based multi-element molten salt. The method includes the steps: placing an open container containing magnesium nitrate hexahydrate or multi-element molten salt mixture with the magnesium nitrate hexahydrate into a heating device for vacuum heating dehydration; placing dehydrated products into an anhydrous oxygen-free glove box and crushing the dehydrated products to obtain the magnesium nitrate or magnesium nitrate based multi-element molten salt. According to the preparation method, the content of alkali magnesium nitrate in the magnesium nitrate and magnesium nitrate based multi-element molten salt can be effectively decreased, high-purity magnesium nitrate or magnesium nitrate based multi-element molten salt can be acquired at lower temperature within a shorter time, and the acquired magnesium nitrate or magnesium nitrate based multi-element molten salt has higher decomposition temperature.

Description

technical field [0001] 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 [0002] 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. [0003] Molten salt (referred to as molten salt) is the form of salt when it melts, and it is a relatively mature heat transfer and heat storage material that is widely used in solar thermal power stations. Since the melting point of pure salt is relatively high, molten salt with industrial applicability...

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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