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Method for producing fused salt level potassium nitrate

A technology of potassium nitrate and molten salt, which is applied in the field of potassium nitrate preparation technology, can solve problems such as the inability to produce potassium nitrate, and achieve the effects of continuous, stable and rapid production, strong safety, and reduced production costs

Inactive Publication Date: 2017-09-05
ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for producing molten salt grade potassium nitrate, which is used to solve the problem that existing potassium nitrate production methods cannot produce potassium nitrate that can be used in the molten salt market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Step S1 neutralization process:

[0062] The mass percentage concentration of the raw material potassium hydroxide solution is 31.54%, the mass percentage concentration of chloride is 0.005%, and the mass percentage concentration of sodium is 0.32%. The potassium hydroxide solution is input into the neutralization kettle. According to the substance ratio of potassium hydroxide and nitric acid being 1:1.01, add a dilute nitric acid solution with a mass percent concentration of 43% and an ammonium salt content of 90ppm into the neutralization tank. Potassium hydroxide solution and dilute nitric acid solution form a reaction solution in the neutralization tank, and neutralization reaction occurs to generate potassium nitrate solution. When the pH of the reaction liquid is 6.4, the concentration of potassium nitrate is 30%, that is, the first raw material liquid of potassium nitrate is obtained.

[0063] Step S2 evaporation concentration:

[0064] The first potassium nit...

Embodiment 2

[0072] Step S1 neutralization process:

[0073] The mass percentage concentration of the raw material potassium hydroxide solution is 32.14%, the mass percentage concentration of chloride is 0.004%, and the mass percentage concentration of sodium is 0.30%. The potassium hydroxide solution is input into the neutralization kettle. According to the substance ratio of potassium hydroxide and nitric acid being 1:1.02, add a dilute nitric acid solution with a mass percent concentration of 45% and an ammonium salt content of 90ppm into the neutralization tank. Potassium hydroxide solution and dilute nitric acid solution form peracid reaction liquid in the neutralization tank, and neutralization reaction occurs to generate potassium nitrate solution. When the pH of the reaction solution is 6.7, the concentration of potassium nitrate is 33%, that is, the first potassium nitrate raw material solution is obtained.

[0074] Step S2 evaporation concentration:

[0075] The primary body o...

Embodiment 3

[0083] Step S1 neutralization process:

[0084] The mass percentage concentration of the raw material potassium hydroxide solution is 31.78%, the mass percentage concentration of chloride is 0.005%, and the mass percentage concentration of sodium is 0.38%. The potassium hydroxide solution is input into the neutralization kettle. According to the substance ratio of potassium hydroxide and nitric acid being 1:1.01, add a dilute nitric acid solution with a mass percent concentration of 48% and an ammonium salt content of 90ppm into the neutralization tank. Potassium hydroxide solution and dilute nitric acid solution form peracid reaction liquid in the neutralization tank, and neutralization reaction occurs to generate potassium nitrate solution. When the pH of the reaction solution is 6.4, the concentration of potassium nitrate is 35%, that is, the first potassium nitrate raw material solution is obtained.

[0085] Step S2 evaporation concentration:

[0086] The primary body o...

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Abstract

The invention discloses a method for producing molten salt-grade potassium nitrate, comprising the following steps: Step S1 neutralization process: potassium hydroxide solution and nitric acid solution are mixed to undergo neutralization reaction to generate potassium nitrate to obtain the first potassium nitrate raw material solution, hydrogen The ratio of the amount of substances of potassium oxide and nitric acid is 1:1.01~1.02; step S2 evaporation process: the first potassium nitrate raw material liquid is evaporated and concentrated until the mass percentage concentration of potassium nitrate is 65~70%, and the second potassium nitrate is obtained Raw material liquid; step S3 spraying and granulating process: spraying and granulating the second potassium nitrate raw material liquid to obtain molten salt grade potassium nitrate as a final product. The method of the invention can directly produce potassium nitrate of high-purity molten salt grade, and has very good industrial value. Moreover, the process of the process of the present invention is simple and efficient in operation, easy to realize automatic production, strong in safety, and suitable for continuous, stable and rapid production of high-purity potassium nitrate.

Description

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

Claims

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Application Information

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IPC IPC(8): C01D9/18
CPCC01D9/18C01P2004/30C01P2004/51C01P2004/60C01P2006/80C01P2006/82
Inventor 张海军石建民宋军蔡守军张生富马银善宋先明付大林马洪才王淑娜
Owner ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД
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