Impurity salt heat storage material and preparation method thereof

A heat storage material and mixed salt technology, applied in the field of mixed salt heat storage material and its preparation, can solve the problems of uncertain mechanical strength of materials, guarantee, high heat storage density, etc., achieve rapid heat storage and heat storage density, improve sintering The effect of high stability and heat storage density

Pending Publication Date: 2022-03-15
TIANJIN ENVIRONMENTAL PROTECTION TECHNICAL DEV CENT DESIGNING INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The higher the content of phase change material, the higher the heat storage density, but the mechanical strength of the material may not be guaranteed

Method used

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  • Impurity salt heat storage material and preparation method thereof
  • Impurity salt heat storage material and preparation method thereof
  • Impurity salt heat storage material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of miscellaneous salt heat storage material, comprising the steps of:

[0034] (1) LiF-NaF miscellaneous salt is used, the mass ratio of LiF and NaF is 60:40, (the electrolytic aluminum waste residue mainly contains AlF 3 , NaF, LiF, CaO);

[0035] (2) The specific heat capacity of LiF-NaF heterosalt is: 1.83 kJ / (kg K), the melting point is: 925 K, the specific heat capacity of SiC ceramic is: 1.95 kJ / (kg K), the melting point is: 723 K; heat storage The recycling temperature of the material is 527°C, the added mass of LiF-NaF miscellaneous salt is 10 parts, and the added mass of SiC ceramic is 40 parts;

[0036] (3) Calcinate the LiF-NaF heterosalt to remove impurities, raise the temperature to 800°C at a rate of 10°C / min, and calcine at a constant temperature of 800°C for 5 hours;

[0037] (4) Mechanically mix the calcined LiF-NaF hetero-salt with SiC at high speed, after high temperature pre-oxidation at 1000°C for 10 minutes, temperature at 11...

Embodiment 2

[0039] The difference from Example 1 is that the added mass of miscellaneous salt is 20 parts.

Embodiment 3

[0041] The difference from Example 1 is that the cycle temperature of the heat storage material is 727°C.

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Abstract

The invention provides a preparation method of a carnallite heat storage material, which comprises the following steps: (1) screening a ceramic material, and determining the addition amount of carnallite and the ceramic material; (2) calcining the carnallite to remove impurities; and (3) mixing the ceramic material screened in the step (1) with the carnallite calcined in the step (2), carrying out high-temperature pre-oxidation and hot press molding to fully sinter the sample, and cooling to room temperature to obtain the product. According to the carnallite heat storage material disclosed by the invention, carnallite is subjected to resource utilization, and the carnallite heat storage material has the advantages of a solid sensible heat storage material and a latent heat storage material and also overcomes the defects of the solid sensible heat storage material and the latent heat storage material, so that the carnallite heat storage material has the specific properties of rapid heat release, rapid heat storage and large heat storage density.

Description

technical field [0001] The invention belongs to the field of waste salt recovery and reuse, and in particular relates to a miscellaneous salt heat storage material and a preparation method thereof. Background technique [0002] Chemical organic industrial miscellaneous salt is the solid waste in the production process of petrochemical, fine chemical, medical chemical, etc. It is currently the largest type of solid waste with the largest output and the most difficult treatment. The discharge of high-salt and high-concentration organic solid waste has caused very serious environmental pollution. On the one hand, it contains high-concentration salt, and the high osmotic pressure makes it difficult for organisms to grow; on the other hand, it also contains a large amount of toxic and refractory Dissolved organic matter such as benzene ring compounds and hydrocarbons, etc. [0003] Due to the high-temperature volatilization and decomposition of sodium carbonate, the composite ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 孙贻超冯辉王锐闫双春尹国盛杨帆刘羿
Owner TIANJIN ENVIRONMENTAL PROTECTION TECHNICAL DEV CENT DESIGNING INST
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