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Boron carbide smelting device and boron carbide preparation method

A smelting device and boron carbide technology, applied in the field of ceramic materials, can solve problems such as unsuitable for large-scale promotion and development, difficult to remove, etc., achieve mass production, reduce energy consumption and material waste, and save labor costs Effect

Active Publication Date: 2018-04-24
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2) Self-propagating high-temperature synthesis method: mix a certain proportion of magnesium powder (or aluminum powder), carbon powder and boron oxide powder, press it into a green body, ignite it in a protective gas, and pickle and dry it to obtain the product after the reaction. The reaction is a strong exothermic reaction, and the reaction temperature is generally between 1273K and 1473K. It is ignited under a protective atmosphere and a certain pressure, and the reaction can be continued by self-sustaining combustion, so it is also called self-propagating high-temperature reduction synthesis (SHS); such as a The preparation method of boron carbide powder, which mixes the raw organic carbon source with boric anhydride and metal magnesium powder according to a certain ratio, and after combustion reaction, the obtained product is added with concentrated hydrochloric acid and stirred and soaked, then suction filtered, washed with water until neutral, and washed with water After drying the obtained filter cake, ultrafine boron carbide polycrystalline powder can be obtained. This method has the advantages of low reaction temperature, energy saving, rapid reaction and easy control, so the purity of the synthesized boron carbide powder is high and the original powder The particle size is finer, and generally does not require crushing treatment. It is the best method for synthesizing boron carbide powder at present, but the residual MgO in the reactant must be washed away by additional processes, and it is extremely difficult to remove completely.
Currently only applicable to special industry needs, not suitable for large-scale promotion and development

Method used

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  • Boron carbide smelting device and boron carbide preparation method

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preparation example Construction

[0048] Specifically, the method for preparing boron carbide based on the above-mentioned boron carbide smelting device comprises the following steps:

[0049] In step S1, the boron source and carbon source are fully mixed to obtain smelting raw materials.

[0050] Specifically, the boron source is boric acid and / or boric anhydride, and the carbon source is at least one of petroleum coke, graphite, amorphous carbon, carbon black, and activated carbon; considering that there will be a slight loss of the boron source, it is therefore preferred to control the smelting The material ratio of boron atoms to carbon atoms in the raw material is 5:1-7:1.

[0051] In step S2, the smelting raw material is completely filled into the smelting furnace body, and the sunken cover plate is covered on the smelting raw material.

[0052] In step S3, voltage is applied to the positive electrode and the negative electrode to heat and smelt the above-mentioned smelting raw materials to obtain boron...

Embodiment 1

[0060] The raw materials are domestic boric acid, petroleum coke and graphite, among which the main content of boric acid is 98.52%, the average particle size is 119μm, and the specific surface area is 1.35m 2 / g. Fully mix 1000kg boric acid, 300kg petroleum coke and 25kg graphite through a mixer to obtain smelting raw materials.

[0061] The smelting raw materials are placed in the boron carbide smelting device for sintering. The specific process of sintering is: 1000KVA transformer (rectifier), 15 levels of on-load tap changers, and the furnace is opened in series to transmit power. According to the furnace resistance and current conditions, it is adjusted to parallel connection. , after changing the parallel mode, gradually increase the gear from the 1st gear, observe the rise of the primary current, and adjust the interval time of the upshift as appropriate, stop the upshift when the primary current reaches about 55A, and drop 1 gear every time the primary current reaches ...

Embodiment 2

[0067] The raw materials are domestic boric acid, boric anhydride, petroleum coke, carbon black and graphite, among which the main content of boric acid is 98.52%, the average particle size is 119μm, and the specific surface area is 1.35m 2 / g. Stir and mix 800kg boric acid, 400kg boric anhydride, 275kg petroleum coke, 10kg conductive carbon black and 25kg graphite, then press it into cylindrical particles with a length of 1.2cm to 3cm through a particle molding machine, and the compacted density is about 1.22g / cm 3 , to obtain smelting raw materials.

[0068] The smelting raw materials are placed in the boron carbide smelting device for sintering. The specific process of sintering is: 1000KVA transformer (rectifier), 15 levels of on-load tap changers, and the furnace is opened in series to transmit power. According to the furnace resistance and current conditions, it is adjusted to parallel connection. , after changing the parallel mode, gradually increase the gear from the ...

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Abstract

The invention discloses a boron carbide smelting device. The boron carbide smelting device comprises a smelting furnace body, wherein the smelting furnace body is built by refractory bricks and comprises a bottom plate and side walls surrounding the bottom plate, and an opening is formed in the top of the smelting furnace body and allows buckling of a sunken type cover plate provided with exhaustholes; the smelting furnace body is filled with smelting raw materials; a positive pole and a negative pole are inserted into two opposite side walls of the smelting furnace body and both penetrate into the smelting furnace, end parts of the positive pole and the negative pole are opposite, and accordingly, the power is switched on for heating and smelting the smelting raw materials; the sunken type cover plate is gradually sunken with phase transformation of the smelting raw materials. The invention further discloses a boron carbide preparation method based on the boron carbide smelting device. According to the boron carbide smelting device, boron carbide is prepared with a nearly closed high-temperature treatment method, impurity pollution is reduced, product crystallinity is good, maincontent of the obtained boron carbide products is higher than 95%, and the products meet the abrasive material requirement after grading and meet the quality requirement of the grinding industry or the engineering ceramic field for boron carbide powder.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and specifically relates to a boron carbide smelting device and a boron carbide preparation method based on the smelting device. Background technique [0002] The lattice of boron carbide belongs to the R3m space lattice, and the lattice constant is α=66°18', also commonly known as hexagonal lattice. The rhombohedral structure of boron carbide can be regarded as a regular icosahedron formed by elongating a cubic cell from the diagonal in space. The diagonal line parallel to the space becomes the C-axis of the hexagonal logo, and three boron atoms are connected with adjacent icosahedrons to form a linear chain. Thus, the unit cell contains 12 icosahedral sites, three of which are on a linear chain. The chemical formula is B 12 C 3 , namely B 4 c. Boron carbide has a stable structure, a relative density of 2.508-2.512, a melting point of 2350°C, and a boiling point of 3500°C. It i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/626F27B14/04F27B14/06F27B14/08F27B14/14F27D1/18F27D7/02
CPCC04B35/563C04B35/62605F27B14/04F27B14/06F27B14/08F27B14/14F27B2014/068F27B2014/0843F27D1/1808F27D7/02
Inventor 彭正军祝增虎王成春臧东营孙庆超诸葛芹李法强上官雪慧杨国威吴康
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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