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Preparation method of submicron potassium nitrate fiber

A potassium nitrate, sub-micron technology, applied in the field of potassium nitrate preparation, can solve the problems of uneven mixing of ignition powder components, affecting safe storage, transportation, and reducing the performance of ignition powder, so as to achieve simple experimental operation and low equipment cost Low, good shape effect

Inactive Publication Date: 2019-05-14
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong oxidizing properties of potassium nitrate powder, special attention should be paid to personal and property safety during the preparation and production process, otherwise there will be great danger
Moreover, the ultrafine potassium nitrate prepared by this method will have a smaller particle size, a sharper specific surface area, and an increase in the surface energy of the particles. A single ultrafine potassium nitrate particle is in an unstable state, so it will quickly agglomerate and agglomerate
This not only affects its safe storage and transportation, but also the agglomeration and agglomeration of potassium nitrate will cause uneven mixing of the ignition powder components, thereby reducing the performance of the ignition powder

Method used

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  • Preparation method of submicron potassium nitrate fiber
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  • Preparation method of submicron potassium nitrate fiber

Examples

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preparation example Construction

[0026] The preparation method of submicron potassium nitrate fiber of the present invention comprises the steps:

[0027] (1) Weigh the stoichiometric amount of analytically pure potassium nitrate, add a certain amount of deionized water, and place it on a magnetic stirrer to stir for 30 minutes. After the potassium nitrate crystals are completely dissolved, add a small amount of nano-silica, and place in an ice bath Sonicate using a cell disruptor. After a period of time, it is taken out to form a potassium nitrate-based nanofluid.

[0028] (2) Pour the nanofluid obtained in step (1) into a glass petri dish in an environment lower than room temperature. And the height of the solution poured into the petri dish is only 2 / 3 of the wall height.

[0029] (3) Move the glass petri dish in step (2) into the fume hood to evaporate and dry, and control the temperature of the fume hood to be lower than room temperature.

[0030] (4) After 2 days, the solution in the petri dish was c...

example 1

[0032] Configure a potassium nitrate solution lower than 0.01 mol / L in a 250 mL beaker, place on a magnetic stirrer and stir for 30 minutes until the solid potassium nitrate is completely dissolved to obtain a potassium nitrate solution; add a small amount of nano-silica particles, and SiO 2 / KNO 3 The mass ratio was 5%, and the mixed solution was placed in an ice bath for ultrasonic dispersion, and the temperature of the solution was controlled below 30 °C during the entire ultrasonic process. After a period of time, the sonication was stopped, and the solution was taken out to form a nitrate-based nanofluid. Pour the prepared salt-based nanofluid into a glass petri dish with a diameter of 9 cm, evaporate and crystallize in a fume hood whose temperature is lower than room temperature. Two days later, a thin, filamentous, milky white film-like solid was observed on the wall of the petri dish, which was submicron potassium nitrate crystals. The sample was observed by a scann...

example 2

[0034] Configure a potassium nitrate solution lower than 0.01 mol / L in a 250 mL beaker, place on a magnetic stirrer and stir for 30 minutes until the solid potassium nitrate is completely dissolved to obtain a potassium nitrate solution; add a small amount of nano-silica particles, and SiO 2 / KNO 3 The mass ratio was 7%, and the mixed solution was placed in an ice bath for ultrasonic dispersion, and the temperature of the solution was controlled below 30 °C during the entire ultrasonic process. After a period of time, the sonication was stopped, and the solution was taken out to form a nitrate-based nanofluid. Pour the prepared salt-based nanofluid into a glass petri dish with a diameter of 9 cm, evaporate and crystallize in a fume hood whose temperature is lower than room temperature. Two days later, a thin, filamentous, milky white film-like solid was observed on the wall of the petri dish, which was submicron potassium nitrate crystals. The sample was observed by a scann...

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Abstract

The invention discloses a preparation method of submicron potassium nitrate fiber. The preparation method is characterized in that potassium nitrate and nano silicon dioxide are used as raw materials,and a simple low-temperature solvent evaporation crystallization method is adopted to obtain the submicron potassium nitrate fiber crystal. According to the preparation method, the operation cost islow, the effects of being simple and feasible are achieved, the technical requirement is low, the high-purity small-particle-size submicron potassium nitrate crystal is prepared mainly by controllingthe concentration of a potassium nitrate solution, the nano particle content, the nano particle dispersion degree, the external environment temperature and the like in the crystallization process, moreover, the obtained crystal is bright in color, and is in a shape of the slender fiber with the diameter ranging within 0.4-2 microns in the aspect of the morphology, agglomeration is not prone to occurrence, and the obvious advantages are shown.

Description

technical field [0001] The invention relates to a preparation method of potassium nitrate, in particular to a preparation method of submicron potassium nitrate fiber. Background technique [0002] Potassium nitrate is an important industrial and agricultural raw material and plays a vital role in national economic construction. At the same time, potassium nitrate is often used in energetic materials due to its excellent properties such as high oxygen content, stuttering feeling, and stable chemical properties. Potassium nitrate is generally used as an oxidant for energetic materials, widely used in pyrotechnic agents, automobile airbag ignition powder, mixed explosives, solid propellants, etc. In order to improve the performance of various ignition powders and pyrotechnic agents, scholars have proposed many methods. Such as: changes in the content and ratio of oxidants, changes in particle size of oxidants, changes in content and ratios of combustion agents, and addition o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/06
Inventor 何思陈迁乔车海山颜海龙漆中路
Owner NANJING UNIV OF SCI & TECH
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