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Recrystallization method for preparing small-particle nitrate

A nitrate and recrystallization technology, applied in the preparation and molding of calcium/strontium/barium nitrate, alkali metal nitrate, lithium nitrate, etc., can solve the problems of low charge density, burning or explosion, and affecting charge density. Achieve the effect of uniform particle size, mild reaction conditions and smooth particle surface

Inactive Publication Date: 2018-12-07
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore existing nitrate easily forms hot spot in pyrotechnic agent and propellant, thereby may produce the danger of burning or explosion; In addition, influence charge density, make its charge density on the low side; Above-mentioned defect limits nitrate in pyrotechnic agent and propellant. Therefore, it is of great significance to refine the nitrate

Method used

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  • Recrystallization method for preparing small-particle nitrate
  • Recrystallization method for preparing small-particle nitrate

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Embodiment 1

[0024] The present embodiment provides a recrystallization method for preparing small particle nitrate, comprising the following steps:

[0025] 1) Dissolve 15g of cesium nitrate raw material in 50mL of deionized water, and filter the solution into a 100mL beaker for later use;

[0026] 2) Add 100mL of absolute ethanol to the 250mL flask, fix the flask on an electric stirring device with a water bath, set the constant temperature water bath to 30°C, turn on stirring, rotate at 300rpm, and after 2min,

[0027] 3) Turn on the constant flow pump and dropwise add the filtrate in the 100mL beaker to the flask, and the drop rate is 20mL / min; after all the dropwise additions are completed, continue stirring for 2h for crystallization;

[0028] 4) Filter, wash, dry and weigh the mixture in the crystallization kettle.

[0029] The weight of cesium nitrate crystal is about 13.4 g, and the yield of cesium nitrate is 89.3%.

Embodiment 2

[0031] The present embodiment provides a recrystallization method for preparing small particle nitrate, comprising the following steps:

[0032] 1) Dissolve 40g potassium nitrate raw material in 100mL deionized water, and filter the solution into a 250mL beaker for later use;

[0033] 2) Add 400mL absolute ethanol to the 1000mL flask, fix the flask on an electric stirring device with a water bath, set the constant temperature water bath to 35°C, turn on stirring, rotate at 400rpm, after 5min;

[0034] 3) Turn on the constant flow pump and dropwise add the filtrate in the 250mL beaker to the flask, and the drop rate is 30mL / min; after all the dropwise additions are completed, continue stirring for 3h for crystallization;

[0035] 4) Filter, wash, dry and weigh the mixture in the crystallization kettle.

[0036] The potassium nitrate crystal weight was about 35.8 g, and the potassium nitrate yield was 89.5%.

[0037] The particle size distribution of potassium nitrate after cr...

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Abstract

The invention provides a recrystallization method for preparing small-particle nitrate, aiming at the problems that nitrate has a poor appearance, and has sharp edges and corners, relatively great granularity and the like. The recrystallization method comprises the following steps: 1) completely dissolving the nitrate into a solvent; filtering to obtain filtrate for later use, wherein the nitrateis one of sodium nitrate, potassium nitrate, cesium nitrate, barium nitrate, calcium nitrate and lithium nitrate, and the solvent is water; 2) injecting a counter solvent into a crystallization kettleand starting to stir, wherein the counter solvent is absolute ethyl alcohol or methanol or acetone and the volume of the counter solvent is 2 to 5 times as much as that of the solvent; 3) after dropwise adding the filtrate into the crystallization kettle, continually stirring to carry out crystallization; and 4) filtering, washing and drying a mixture in the crystallization kettle.

Description

technical field [0001] The invention relates to the technical field of raw material processing, in particular to a recrystallization method for preparing small particle nitrate. Background technique [0002] Plasma can reflect or refract electromagnetic waves, form radar false targets, and play a role in stealth. Thermal ionization is the easiest way to generate plasma. Alkali metal elements have the lowest ionization energy in nature, but due to their active chemical It is not easy to be used in actual operation, so alkali metal salts are used as substitutes. Cesium nitrate has the characteristics of relatively low melting point, boiling point and decomposition temperature, and is an ideal material, while potassium nitrate, sodium nitrate, barium nitrate, nitric acid Lithium can also be ionized as an alkali metal salt. [0003] At present, the nitrates sold in the market have problems such as poor appearance, sharp edges and corners, and large particle size. See figure 1 ...

Claims

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Application Information

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IPC IPC(8): C01D9/18C01D15/10C01D17/00C01F11/44B01D9/02B01D9/00B01D36/00
CPCB01D9/0013B01D9/02B01D36/00C01D9/18C01D15/10C01D17/003C01F11/44
Inventor 黄阳飞王浩静杨利青刘欢李文龙周倩倩
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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