Method for preparing spherical amorphous boron powder by spray drying method

An amorphous boron powder, spray drying technology, applied in chemical instruments and methods, inorganic chemistry, boron compounds, etc., can solve the problem of no spherical amorphous boron powder patents and reports, etc., to achieve a short preparation period, the method is simple and easy Excellent effect of line and sphericity

Inactive Publication Date: 2010-06-16
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] According to the novelty search results of domestic and foreign patents and journals: there is no patent or report on the preparation of spherical amorphous boron powder by spray drying method

Method used

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  • Method for preparing spherical amorphous boron powder by spray drying method
  • Method for preparing spherical amorphous boron powder by spray drying method
  • Method for preparing spherical amorphous boron powder by spray drying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 As shown, 40 grams of boron powder and 60 grams of distilled water are evenly mixed. The boron powder is an amorphous boron powder with a particle size of 0.2 to 1 μm and a mass purity of 90%. Add 1.000 grams of polyethylene glycol (molecular weight is 2000), first Ultrasonic dispersion for 30 minutes (ultrasonic frequency is 20KHz-30KHz, power is 140W-160W, the same below), and then magnetically stirred for 30 minutes to obtain a boron powder slurry; use a sodium hydroxide solution with a molar concentration of 2.0mol / L to mix boron The pH value of the powder slurry is adjusted to 10 to obtain the boron powder slurry after adjusting the pH value; then utilize a spray dryer to spray dry the boron powder slurry after adjusting the pH value, first adjust the inlet air temperature of the spray dryer to 140°C, pre-spray with distilled water for 15 minutes, and then spray dry the boron powder slurry. Control the air flow rate of the spray dryer to 40mL / s, an...

Embodiment 2

[0032] Evenly mix 40 grams of boron powder with 60 grams of distilled water. The boron powder is an amorphous boron powder with a particle size of 0.2-1 μm and a mass purity of 95%. Add 0.800 grams of polyethylene glycol (molecular weight: 2000), and first ultrasonically disperse it Minutes, then magnetically stirred for 20 minutes to obtain the boron powder slurry; the pH value of the boron powder slurry was adjusted to 9 by using a sodium hydroxide solution with a molar concentration of 2.0mol / L to obtain the boron powder slurry after adjusting the pH value; Then utilize the spray dryer to spray dry the boron powder slurry after adjusting the pH value, adjust the inlet air temperature of the spray dryer to 130°C, pre-spray with distilled water for 15 minutes, and then spray dry the boron powder slurry to control The air flow rate of the spray dryer is 30mL / s, and the flow rate of the peristaltic pump is 300mL / h. During the whole process, the boron powder slurry is continuousl...

Embodiment 3

[0035] Evenly mix 40 grams of boron powder with 60 grams of distilled water. The boron powder is an amorphous boron powder with a particle size of 0.2-1.2 μm and a mass purity of 85%. Add 2.400 grams of polyethylene glycol (molecular weight: 20,000) and ultrasonically disperse 15 minutes, then magnetically stirred for 15 minutes to obtain a boron powder slurry; using a sodium hydroxide solution with a molar concentration of 2.0mol / L to adjust the pH value of the boron powder slurry to 11, to obtain a boron powder slurry after adjusting the pH value Then utilize the spray dryer to spray dry the boron powder slurry after adjusting the pH value, adjust the inlet air temperature of the spray dryer to 150°C, pre-spray with distilled water for 15 minutes, and then spray dry the boron powder slurry, Control the air flow rate of the spray dryer to 50mL / s, and the flow rate of the peristaltic pump to 500mL / h. During the whole process, the boron powder slurry is continuously magnetically...

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Abstract

The invention relates to a method for preparing spherical amorphous boron powder by a spray drying method, which is characterized by comprising the following steps of: (1) pulping: evenly mixing boron powder and distilled water according to the mass ratio of 30:70 to 40:60, adding additive based on 2-6 percent of the boron powder, firstly, performing ultrasonic dispersion for 15-30 minutes and then stirring magnetically for 15-30 minutes to obtain the boron powder pulp, adding sodium hydroxide solution in the boron powder pulp and adjusting the pH value of the boron powder pulp to 9-12 to obtain the boron powder pulp after adjusting the pH value; (2) spray drying: performing spray drying on the boron powder pulp after adjusting the pH value in the step (1) with a spray dryer; and (3) vacuum drying: placing the spherical boron powder obtained in the step (2) in a vacuum drying box, and drying for 1-2 hours at 70-90 DEG C to obtain the spherical amorphous boron powder. The method is simple and easy to operate, and the spherical amorphous boron powder prepared by the method has excellent sphericity, high boron content and small grain size.

Description

technical field [0001] The invention relates to a preparation method of spherical amorphous boron powder. Background technique [0002] Boron is the preferred energetic material in solid propellants due to its high mass calorific value and volume calorific value. [0003] The melting point and boiling point of elemental boron are relatively high, which is difficult to melt and gasify; the boiling point of boron oxide is also very high, which determines that the temperature is very high to make boron particles ignite and burn, and the combustion process has to go through B 2 o 3 The evaporation of the oxide layer further increases the difficulty of boron particle ignition and combustion. Boron has low combustion efficiency, high oxygen consumption, and produces a lot of residues, which cannot exert its high-energy calorific value; there is B on the surface of boron 2 o 3 、H 3 BO 3 Such impurities make boron incompatible with hydroxyl-terminated polybutadiene (HTPB) in b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/00
Inventor 张联盟贺振华张东明宋建荣张子渊
Owner WUHAN UNIV OF TECH
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