Method for preparing boron powder by combustion synthesis

A combustion synthesis, boron powder technology, applied in the direction of boron/boride, can solve the problems of high production cost, complex process, low product purity, etc., achieve good product quality, high purity and product yield, and improve the reaction. active effect

Inactive Publication Date: 2004-06-30
丹东市化工研究所有限责任公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The magnesia thermal reduction method of boron powder production has many shortcomings, especially the purity of the product obtained by this method is not high, and it can only reach 85% without subsequent purification treatment. can only reach about 92%
Its technological process is complicated, difficult to control, and the reaction yield is low, and the product production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Mix boron oxide and magnesium powder at a ratio of 1:1 (by weight), and grind them with a high-energy vibrating ball mill for 3 hours under the protection of argon to obtain a particle size of less than 6 microns. Take out the material, and put the powdered material directly into the combustion synthesis reactor In the process, a resistance wire is used to ignite the reaction, a large amount of white smoke comes out, and the reaction ends within a few minutes. After the reactant cools down, it is taken out, washed with 10% hydrochloric acid to remove magnesium oxide, filtered and dried to obtain boron powder with a purity ≥ 90%, the particle size≤6 microns, and the yield is 91% (calculated by magnesium).

Embodiment 2

[0015] Mix boron oxide and magnesium powder at a ratio of 1.5:1 (by weight), and grind for 14 hours with a high-energy vibrating ball mill under the protection of argon to obtain a particle size of ≤3 microns. Take out the material, and put the powdered material directly into the combustion synthesis reactor In the process, the deflagration method is used to ignite and initiate the reaction, a large amount of white smoke comes out, and the reaction ends within two minutes. After the reactant cools down, it is taken out, washed with 10% hydrochloric acid to remove magnesium oxide, filtered and dried to obtain boron powder with a purity of ≥ 95%, the particle size≤3 microns, and the yield is 93% (calculated by magnesium).

Embodiment 3

[0017] Mix boron oxide and magnesium powder at a ratio of 2.5:1 (by weight), and grind for 25 hours with a high-energy vibrating ball mill under the protection of argon to obtain a particle size of ≤1 micron. Take out the material, make a billet, and then put it into a combustion synthesis reaction In the container under the protection of argon gas, the resistance wire was used to ignite the reaction, and a large amount of white smoke came out. The reaction was completed within three minutes. The obtained boron powder has a purity of ≥95%, a particle size of ≤1 micron, and a yield of 92% (calculated as magnesium).

[0018] In the mixing ratio of boron oxide and magnesium powder, an excess of boron oxide is generally required, and the excess of boron oxide mainly has two functions. control. 2. Excessive boron oxide can reduce the formation of boron-magnesium compounds such as magnesium diboride, thereby improving the purity of the product.

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Abstract

The method for preparing boron powder by using combustion synthesis process includes the following steps: mixing boron oxide and magnesium powder according to the ratio of 1-2.5:1 (weight), under the protection of argon gas grinding them for 3-30 hr. by using high-energy mill, making the said material into blank or directly using powder material and placing it into combustion synthesis reactor, using detonating process or using resistance wire to make initiation and implement combustion synthesis reaction, after the reaction is completed, using acid to wash and remove magnesium oxide so as to obtain the boron powder whose purity can be up to 90-97%.

Description

technical field [0001] The invention relates to a method for preparing elemental boron powder using combustion synthesis technology. Specifically, mechanical alloying equipment is used to process raw materials to improve their activity, and boron powder is produced through combustion synthesis technology. Background technique [0002] The current industrial production method of elemental boron powder is mainly the magnesia thermal reduction method, which uses boron oxide and magnesium powder as the main raw materials, and uses magnesium to reduce boron. The reaction formula is: [0003] <chemistry num="001"> <chem file="02144932_cml001.xml" / > < / chemistry> [0004] Its production process is to mix 150 micron boric anhydride powder and magnesium powder at a ratio of 3:1 (weight ratio), and carry out a reduction reaction in a tube furnace at 850-900°C under vacuum conditions to reduce boric anhydride to elemental boron, and then the reaction material is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/02
Inventor 倪坤马贤锋
Owner 丹东市化工研究所有限责任公司
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