Granulation method of potassium nitrate and potassium nitrate particles prepared with method

A potassium nitrate and granulation technology, applied in the field of potassium nitrate granules, can solve the problems of easy failure of granulation equipment, complicated granulation process, difficult repair, etc., and achieves good granulation and forming effect, simple process and good drying effect. Effect

Inactive Publication Date: 2019-02-26
QINGHAI SALT LAKE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The spray granulation technology has a good effect on the granulation of agricultural grade potassium nitrate, but it is difficult to granulate industrial grade potassium nitrate with a main content of potassium nitrate ≥ 99%; the granulation process is complicated; and the granulation of potassium nitrate spray granulation Granular equipment is prone to failure, and it is difficult and costly to repair after failure

Method used

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  • Granulation method of potassium nitrate and potassium nitrate particles prepared with method
  • Granulation method of potassium nitrate and potassium nitrate particles prepared with method
  • Granulation method of potassium nitrate and potassium nitrate particles prepared with method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The first step: prepare powdery potassium nitrate

[0060] Using potassium chloride and ammonium nitrate as raw materials, potassium nitrate solution is prepared by ion exchange method, and evaporated and concentrated by multi-effect evaporators with one-effect evaporation at 120°C, second-effect evaporation at 100°C, third-effect evaporation at 90°C, and fourth-effect evaporation at 70°C , cooling and crystallization, the crystal temperature is 30°C, and the powdered potassium nitrate is separated from the solid and liquid by the centrifuge. Through laboratory analysis, the main content of powdery potassium nitrate is 99%.

[0061] The second step: preparation of high temperature heat carrier

[0062] Heat the molten salt (ternary molten salt or binary molten salt) to 340°C, and select the above-mentioned first preferred circulation route.

[0063] During the high-temperature molten salt circulation process, the potassium nitrate melting tank, the liquid potassium ni...

Embodiment 2

[0071] The first step: prepare powdery potassium nitrate

[0072] Potassium nitrate solution is prepared by neutralization method of nitric acid and potassium hydroxide, evaporated and concentrated through multi-effect evaporators with 130°C first effect evaporation, 110°C second effect evaporation, 100°C third effect evaporation, and 80°C fourth effect evaporation, cooling and crystallization, crystallization The temperature is 40°C, and the powdered potassium nitrate is separated from the solid and liquid by the centrifuge. Through laboratory analysis, the main content of powdered potassium nitrate is 99.5%.

[0073] The second step: preparation of high temperature heat carrier

[0074] Heat the molten salt (ternary molten salt or binary molten salt) to 380°C, and select the above-mentioned first preferred circulation route.

[0075] During the high-temperature molten salt circulation process, the potassium nitrate melting tank, the liquid potassium nitrate buffer tank and...

Embodiment 3

[0083] The first step: prepare powdery potassium nitrate

[0084] Potassium nitrate solution is prepared by double decomposition method using potassium chloride and sodium nitrate as raw materials. It is evaporated and concentrated by multi-effect evaporators with 140°C first-effect evaporation, 120°C second-effect evaporation, 110°C third-effect evaporation and 90°C fourth-effect evaporation, and cooling crystallization , the crystal temperature is 50°C, and the powdery potassium nitrate is separated from the solid and liquid by the centrifuge. Through laboratory analysis, the main content of powdery potassium nitrate is 99.8%.

[0085] The second step: preparation of high temperature heat carrier

[0086] Heat the molten salt (ternary molten salt or binary molten salt) to 395°C, and select the above-mentioned first preferred circulation route.

[0087] During the high-temperature molten salt circulation process, the potassium nitrate melting tank, the liquid potassium nitr...

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Abstract

The invention discloses a granulation method of potassium nitrate. The method comprises following steps: (1), preparation of powdery potassium nitrate; (2), heating of carriers; (3), fusing of solid potassium nitrate; (4), tower granulation of potassium nitrate; (5), cooling packaging. The granulation method of potassium nitrate particles is simple, easy to operate, high in stability, good in granulation molding effect, good in drying effect and suitable for continuous mass production; the potassium nitrate particles prepared with the method are uniform in size, high in potassium nitrate purity and low in moisture content.

Description

technical field [0001] The present invention relates to nitrate production technology, more specifically, relate to a kind of high-tower granulation method of potassium nitrate and the potassium nitrate granule prepared therefrom. Background technique [0002] Potassium nitrate is one of the important chemical raw materials, widely used in national defense, military industry, industry, agriculture, food additives, medicine, feed additives, optical glass and electronic industries and other fields. Potassium nitrate is a strong oxidant, which can fuel the fire when it meets combustibles; it may cause combustion and explosion when it contacts or mixes with organic matter, reducing agent, and combustibles. When burning and decomposing, it will release toxic nitrogen oxide gas. Therefore, potassium nitrate is identified as dangerous goods in category 5.1, and there are strict requirements for its packaging, storage and transportation. [0003] The traditional potassium nitrate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/18
CPCC01D9/18
Inventor 张海军宋先明宋军马银善蔡守军赵文柱邓文张生富郑祥陈利斌
Owner QINGHAI SALT LAKE IND
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