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Method for producing molten salt-grade sodium nitrate

A technology of sodium nitrate and the third sodium nitrate, applied in the field of producing molten salt grade sodium nitrate, can solve problems such as inability to produce molten salt grade sodium nitrate, and achieve the effects of continuous, stable and rapid production, strong safety, and high economic benefits.

Active Publication Date: 2017-05-24
QINGHAI SALT LAKE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of method for producing molten salt grade sodium nitrate, be used to solve the problem that existing sodium nitrate production method can't produce molten salt grade sodium nitrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Step S1 neutralization process:

[0070] 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 carbonate and nitric acid being 1:2.015, add a dilute nitric acid solution with a mass percent concentration of 43% and an ammonium salt content of 90ppm into the neutralization tank. The sodium carbonate 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.

[0071] 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 soluti...

Embodiment 2

[0088] Step S1 neutralization process:

[0089] The mass percentage concentration of raw material sodium carbonate solution is 25%, and temperature is 35 ℃, puts in the neutralization tank; The mass percentage concentration of raw material nitric acid solution is 43%, and ammonium salt content is 80ppm, adds in the neutralization tank, forms reaction solution. Among them, the ratio of sodium carbonate to nitric acid is 1:2.02. In the neutralization kettle, the first sodium nitrate raw material solution formed after the neutralization reaction of sodium carbonate and nitric acid has a pH value of 3.5 and a sodium nitrate concentration of 25% by mass.

[0090] Step S2 carbon dioxide removal process:

[0091] Transporting the first sodium nitrate raw material solution from the neutralization tank to the raw material tank, removing carbon dioxide in the first sodium nitrate raw material solution by heating to obtain a second sodium nitrate raw material solution. A small amount o...

Embodiment 3

[0104] Step S1 neutralization process:

[0105] The mass percentage concentration of raw material sodium carbonate solution is 30%, and temperature is 60 ℃, puts in the neutralization tank; The mass percentage concentration of raw material nitric acid solution is 48%, and ammonium salt content is 90ppm, adds in the neutralization tank; Form reaction solution. Among them, the ratio of sodium carbonate to nitric acid is 1:2.01. In the neutralization kettle, the first sodium nitrate raw material liquid formed after the neutralization reaction of sodium carbonate and nitric acid has a pH value of 4.5 and a sodium nitrate concentration of 28% by mass.

[0106] Step S2 carbon dioxide removal process:

[0107] Transporting the first sodium nitrate raw material solution from the neutralization tank to the raw material tank, removing carbon dioxide in the first sodium nitrate raw material solution by heating to obtain a second sodium nitrate raw material solution. A small amount of t...

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PUM

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Abstract

The invention discloses a method for producing molten salt-grade sodium nitrate, wherein the method comprises the following steps: step S1, a neutralization process: neutralizing a sodium carbonate solution and a nitric acid solution to form a first sodium nitrate raw material solution with the pH value of 3.5-4.5 and the mass percentage concentration of 23-28%; step S2, a carbon dioxide removal process: removing carbon dioxide in the first sodium nitrate raw material solution to form a second sodium nitrate raw material solution; step S3, an evaporation process: carrying out evaporation concentration on the second sodium nitrate raw material solution to obtain a third sodium nitrate raw material solution with the mass percentage concentration of 63-67%; step S4, a crystallization dehydration process: crystallizing and dehydrating the third sodium nitrate raw material solution to prepare a solid sodium nitrate raw material; and step S5, a drying process: drying the solid sodium nitrate raw material, to prepare the final product molten salt-grade sodium nitrate. The method can directly produce the high-purity molten salt-grade sodium nitrate, is simple and easy to control, can realize automatic production, and is suitable for safe, continuous, stable and rapid production of the high-purity sodium nitrate.

Description

technical field [0001] The invention relates to the technical field of sodium nitrate preparation technology, in particular to a method for producing molten salt grade sodium nitrate. 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. [0003] Sodium nitra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/04
CPCC01D9/04C01P2006/80
Inventor 张海军石建民宋军张生富马银善宋先明杨海勇付大林王淑娜马洪才
Owner QINGHAI SALT LAKE IND
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