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Method for refining and purifying amorphous boron powder

A technology of amorphous boron powder and zirconia balls, applied in the direction of boron/boride, boron, etc., can solve the problems affecting the physical and chemical properties of boron powder, restrictions on the application of boron powder, low purity of boron powder, etc. Short, the effect of increasing added value

Pending Publication Date: 2021-09-07
江苏智仁景行新材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The boron powder produced by the magnesia thermal reduction method has a low purity, generally between 85% and 92%, and the particle size is coarse (3-7μm). The low purity and large particle size directly affect the physical and chemical properties of the boron powder, especially the ignition Combustion performance and process compatibility make the application of boron powder in related fields greatly limited

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  • Method for refining and purifying amorphous boron powder
  • Method for refining and purifying amorphous boron powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1.0kg of commercially available amorphous boron powder, 0.5mol / L hydrochloric acid as the medium of acid ball milling, Φ3mm Al 2 o 3 As a grinding ball, the ball-to-material ratio is 6:1, the liquid-solid ratio is 2:1, and the rotation speed is 300rpm, and the acidic medium ball milling is carried out at 60°C for 4 hours; Wash with water for 20 minutes; after one wash, use 1.0mol / L sodium hydroxide as the medium of alkaline ball milling, Φ3mm Al 2 o 3 For grinding balls, the ball-to-material ratio is 6:1, the liquid-solid ratio is 2:1, and the rotation speed is 300rpm, and the alkaline medium ball milling is carried out at 80°C for 4 hours; 6 times of water washing for 20 minutes; after the second water washing, the filter cake of amorphous boron powder is vacuum-dried at 100° C. for 3 hours. The SEM photo of the amorphous boron powder after vacuum drying shows that its particle size is all below 2.0 μm ( figure 1 ), the particle size measured by laser particle size...

Embodiment 2

[0029] 1.0kg of commercially available amorphous boron powder, 1.0mol / L hydrochloric acid as the medium of acid ball milling, Φ3mm Al 2 o 3 As a grinding ball, the ball-to-material ratio is 6:1, the liquid-solid ratio is 2:1, and the rotation speed is 300rpm, and the acidic medium ball milling is carried out at 60°C for 6h; Wash with water for 20 minutes; after one wash, use 1.2mol / L sodium hydroxide as the medium of alkaline ball milling, Φ3mm Al 2 o 3 For grinding balls, the ratio of ball to material is 6:1, the ratio of liquid to solid is 2:1, and the rotation speed is 300rpm, and the alkaline medium ball milling is carried out at 80°C for 3 hours; after the alkaline medium ball milling, the amorphous boron powder is subjected to 60°C 6 times of water washing for 20 minutes; after the second water washing, the filter cake of amorphous boron powder is vacuum-dried at 100° C. for 3 hours. The boron content of the treated amorphous boron powder measured by the neutralizatio...

Embodiment 3

[0031] 1.0kg of commercially available amorphous boron powder, 1.0mol / L of hydrofluoric acid as the medium of acid ball milling, Φ3mm of Al 2 o 3As a grinding ball, the ball-to-material ratio is 6:1, the liquid-solid ratio is 3:1, and the rotation speed is 300rpm, and the acidic medium ball milling is carried out at 60°C for 8 hours; after the acidic medium ball milling, the amorphous boron powder is subjected to 2 Wash with water for 30 minutes; after one wash, use 1.0mol / L sodium hydroxide as the medium of alkaline ball milling, Φ3mm Al 2 o 3 For grinding balls, the ball-to-material ratio is 6:1, the liquid-solid ratio is 3:1, and the rotation speed is 300rpm, and the alkaline medium ball milling is carried out at 80°C for 4 hours; 6 times of water washing for 20 minutes; after the second water washing, the filter cake of amorphous boron powder is vacuum-dried at 100° C. for 3 hours. The boron content of the treated amorphous boron powder was measured by neutralization ti...

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Abstract

The invention discloses a method for refining and purifying amorphous boron powder, the method comprises the following steps: carrying out acid medium ball milling, primary water washing, alkaline medium ball milling, secondary water washing and vacuum drying treatment on the amorphous boron powder to obtain the amorphous boron powder with the particle size of less than 1.2 mu m and the purity of more than 95%. According to the ball milling refining and acid / alkali washing purification method, the amorphous boron powder which is sold in the market and produced through a magnesiothermic reduction method can be synchronously refined and purified, the problems that the amorphous boron powder sold in the market is large in particle size and low in purity are solved, and the additional value of the amorphous boron powder is increased. The method provided by the invention has the advantages of short flow, low energy consumption, stable and reliable process and large-scale production potential.

Description

technical field [0001] The invention belongs to the technical field of boron fine chemical industry, and in particular relates to a method for refining, removing impurities and purifying amorphous coarse boron powder. Background technique [0002] Due to the advantages of large specific surface area, high combustion calorific value and clean combustion products, amorphous boron powder has broad application prospects in military and military fields such as solid propellants, explosives and pyrotechnics. In addition, amorphous boron powder is also used as neutron absorber, airbag initiator, alloy component and additive in nuclear power, automobile manufacturing, metallurgical synthesis and advanced ceramics and other fields. [0003] At present, the preparation methods of amorphous boron powder that have been reported include molten salt electrolysis, boron halide hydrogen reduction, diborane cracking and metal magnesia thermal reduction. The first three methods can realize t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/02
CPCC01B35/023
Inventor 王贵宗刘林林苏帅王祥张彭威
Owner 江苏智仁景行新材料研究院有限公司
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