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High-thermal-conductivity nitrate fused salt and preparation method thereof

A nitrate, high thermal conductivity technology, applied in the field of molten salt, can solve the problem of using crystalline silicon powder waste in molten salt system, and achieve the effect of improving thermal conductivity

Pending Publication Date: 2021-09-24
宁晋县氢为新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] However, the improvement in the prior art is mainly to use SiO 2 , ZnO, Al 2 o 3 , CaO, TiO 2 , MgO and other components are added to the molten salt system to improve the heat transfer and heat storage effect of the existing molten salt system. At present, no one uses crystalline silicon powder waste in the molten salt system

Method used

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  • High-thermal-conductivity nitrate fused salt and preparation method thereof
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The high thermal conductivity nitrate molten salt provided in this embodiment is mainly composed of single crystal silicon and nitrate molten salt, wherein the mass percentage of single crystal silicon is 45%, and the rest is nitrate molten salt.

[0048] In this embodiment, the single crystal silicon comes from the crystalline silicon waste with a size of micrometers and above and no more than centimeters generated during the cutting process of single crystal silicon.

[0049] Monocrystalline silicon contains small amounts of conventional organic compounds and metal impurities generated during the preparation of crystalline silicon.

[0050] The nitrate molten salt is sodium nitrate.

[0051] The preparation process is as follows:

[0052] (1) Collect the single crystal silicon scraps produced by the crystalline silicon cutting process;

[0053] (2) At about 80°C, denaturation baking is performed on the contamination of organic matter (mainly the components of the wi...

Embodiment 2

[0059] The high thermal conductivity nitrate molten salt provided in this embodiment is mainly composed of monocrystalline silicon and nitrate molten salt, wherein the mass percentage of monocrystalline silicon is 20%, and the rest is nitrate molten salt.

[0060] In this embodiment, the crystalline silicon powder is single-crystal silicon powder, which comes from crystalline silicon wastes of micron level and below produced during the cutting process of single-crystal silicon.

[0061] Monocrystalline silicon contains small amounts of conventional organic compounds and metal impurities generated during the preparation of crystalline silicon.

[0062] The nitrate molten salt is potassium nitrate and sodium nitrite.

[0063] Its preparation process is as follows:

[0064] (1) Collect the micron-level and below powder produced by the single crystal silicon cutting process;

[0065] (2) denaturation and baking of organic matter (main component of cutting fluid) contamination by...

Embodiment 3

[0071] The high thermal conductivity nitrate molten salt provided in this embodiment is mainly composed of single crystal silicon and nitrate molten salt, wherein the mass percentage of single crystal silicon is 10%, and the rest is nitrate molten salt.

[0072] In this embodiment, the single crystal silicon comes from the single crystal silicon scraps of micron level and below produced in the single crystal silicon cutting process.

[0073] The monocrystalline silicon scraps contain a small amount of conventional organic matter and metal impurities generated during the preparation of monocrystalline silicon.

[0074] The nitrate molten salt is sodium nitrate.

[0075] The preparation process is as follows:

[0076] (1) Collect the scraps generated during the crystalline silicon cutting process;

[0077] (2) denaturation and baking of organic matter (main component of cutting fluid) contamination by high temperature (not lower than 80°C);

[0078] (3) use hydrochloric acid ...

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Abstract

The invention discloses high-thermal-conductivity nitrate fused salt which is mainly composed of monocrystalline silicon and nitrate fused salt, and the mass percentage content of the monocrystalline silicon is 5-45%. The invention further discloses a preparation method of the high-thermal-conductivity nitrate fused salt and a method for improving the thermal conductivity of the fused salt; monocrystalline silicon is added into the nitrate fused salt, and the thermal conductivity of the nitrate fused salt can be improved; monocrystalline silicon waste generated in the monocrystalline silicon cutting process can be recycled, and the heat conduction capability of the nitrate fused salt can also be improved.

Description

technical field [0001] The invention belongs to the technical field of molten salt, and in particular relates to a high thermal conductivity nitrate molten salt and a preparation method thereof. Background technique [0002] Molten salt is a heat transfer and heat storage medium with low cost, long life, good heat transfer and heat storage performance at high temperature, high heat flux and low operating pressure. Using molten salt as the heat transfer and heat storage working medium of CSP can significantly improve the thermal efficiency, system reliability and economy of the CSP system, and help the CSP station to achieve continuous and stable operation. Heat storage is the core competitiveness of CSP technology. On a global scale, CSP plants currently under construction and planned to be developed are increasingly adopting molten salt heat transfer and heat storage technology. The amount of molten salt in the future will further increase. Increase. In recent years, with...

Claims

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Application Information

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IPC IPC(8): C09K5/12
CPCC09K5/12
Inventor 柳国伟柳一泽
Owner 宁晋县氢为新能源科技有限公司