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Nitrate system molten salt heat conduction material and preparation method thereof

A heat-conducting material and nitrate technology, which is applied in the preparation of alkali metal nitrate, the preparation and molding of alkali metal nitrate, etc., can solve the problems such as the inability to produce molten salt grade sodium nitrate, and achieve continuous, stable and rapid production, high economic benefits, Facilitate the effect of large-scale promotion

Inactive Publication Date: 2019-06-04
张珍华
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Problems solved by technology

[0005] The purpose of the present invention is to provide a nitrate system molten salt heat-conducting material and its preparation method, which is used to solve the problem that the existing sodium nitrate production method cannot produce molten salt grade sodium nitrate

Method used

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Embodiment

[0020] Step S1 neutralization process:

[0021] Industrial high-grade soda ash is used, with a chloride content of 0.15%, and it is configured into a soda ash solution with a mass percentage concentration of 25%. During the configuration of the soda ash solution, the temperature of the solution is controlled to be 40°C. The configured soda ash solution is input into the neutralization kettle. According to the substance ratio of sodium sulfate and nitric acid is 1: 2.015, add the dilute nitric acid solution that the mass percent concentration is 43% and the ammonium salt content is 90ppm in the neutralization kettle. The sodium sulfate solution and the dilute nitric acid solution form a peracid reaction solution in the neutralization tank, and a neutralization reaction occurs to generate a sodium nitrate solution.

[0022] When the pH of the reaction solution is 3.5, the mass percent concentration of sodium nitrate is 23%, which is the first sodium nitrate raw material solutio...

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Abstract

The invention discloses a nitrate system molten salt heat conduction material and a preparation method thereof. The method comprises the following steps: S1, neutralizing: neutralizing a sodium sulfate solution and a nitric acid solution to form a first sodium nitrate raw material solution having a pH value of 3.5-4.5 and a mass percentage concentration of 23-28%; S2, removing carbon oxides: removing the carbon oxides in the first sodium nitrate raw material solution to form a second sodium nitrate raw material solution; S3, evaporating: carrying out evaporative concentration on the second sodium nitrate raw material solution to obtain a third sodium nitrate raw material solution having a mass percentage concentration of 63-67%; S4, crystallizing and dehydrating: crystallizing and dehydrating the third sodium nitrate raw material solution to obtain a solid sodium nitrate raw material; and S5, drying: drying the solid sodium nitrate raw material to obtain the final product molten salt grade sodium nitrate. The method allows the high-purity molten salt grade sodium nitrate to be directly produced, and has the advantages of simplicity, easiness in control, realization of automatic production, and suitableness for safe, continuous, stable and rapid production of high-purity sodium nitrate.

Description

technical field [0001] The invention relates to the technical field of nitrate preparation technology, in particular to a nitrate system molten salt heat-conducting material and a preparation method thereof. Background technique [0002] Molten salt is a molten body formed after melting salts, usually composed of metal cations and non-metal anions, and is rich in types. The binary molten salt composed of sodium nitrate and potassium nitrate at a mass ratio of 6:4 has a melting point of 160 degrees Celsius and a working temperature of 560 degrees Celsius. It has been proved by actual cases that it is a mature heat storage medium suitable for photothermal power generation systems. Compared with traditional hydrocarbons and heat transfer oil and other heat transfer media, it has the advantages of low cost, long life, good heat transfer performance, high working temperature, high heat flux, low pressure, non-flammable, and pollution-free. It has very broad application prospects...

Claims

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Application Information

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IPC IPC(8): C01D9/04C01D9/18
Inventor 张珍华
Owner 张珍华
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