Method and apparatus for producing silicon nitride or ferro silicon nitride by low pressure combustion

A technology of ferrosilicon nitride and low-pressure combustion, which is applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., and can solve problems such as inability to continue large-scale production

Inactive Publication Date: 2003-06-18
UNIV OF SCI & TECH BEIJING
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] Aiming at the problem that the existing method of combustion synthesis of silicon nitride or ferrosilicon nitride cannot be produced continuously and on a large scale, the present invention proposes a method for synthesizing sil

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  • Method and apparatus for producing silicon nitride or ferro silicon nitride by low pressure combustion
  • Method and apparatus for producing silicon nitride or ferro silicon nitride by low pressure combustion

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[0017] The silicon powder and silicon nitride powder are batched according to the ratio of 100:20, and then put into a ball mill to mix and grind, so that the particle size after grinding is -0.088mm, ≥90%. Pile coke and wood at the bottom of the vertical combustion synthesis reactor until it reaches the inside of the reaction vessel, and then ignite the wood and coke. When the inside of the reaction vessel reaches 1000°C, the nitrogen gas is preheated through the interlayer of the reaction vessel and then enters the reaction vessel. internal. At the same time, the batch material is evenly sprinkled into the reaction vessel through the gate valve, quantitative feeder, and distributor, where the combustion synthesis reaction is carried out. Falling into the bottom of the reaction vessel under the action of gravity, a β-type silicon nitride product with a honeycomb loose block structure is finally obtained, and the reaction product becomes a silicon nitride powder with a β-type ...

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Abstract

A process for preparing silicon (or ferrosilicon) nitride from silicon powder (or ferrosilicon) powder and the fine powder of silicon (or ferrosilicon) nitride as diluent by low-voltage combustion includes such steps as continuous burning at 900-1850 deg.C in vertical reacting furnace, cooling, and grinding.

Description

Technical field: [0001] The invention relates to a preparation method of an inorganic non-metallic material, in particular to the preparation of silicon nitride or ferrosilicon nitride. Background technique: [0002] Silicon nitride (Si 3 N 4 ) The common preparation methods include direct nitriding method, carbothermal reduction method, gas phase method and combustion synthesis method. The combustion synthesis method is a recently developed method for the preparation of Si with relatively simple equipment, easy operation and high productivity. 3 N 4 Methods. Compared with other preparation methods, the combustion synthesis method has low production cost and is more suitable for industrial production. However, the synthesis of Si by combustion synthesis 3 N 4 There are few reports, and the reports are all combustion synthesis under high-pressure nitrogen. In the reported combustion synthesis of silicon nitride, due to the limitation of high-pressure nitrogen combusti...

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Application Information

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IPC IPC(8): C01B21/06C01B21/068C04B35/584C04B35/591
Inventor 孙加林洪彦若祝少军
Owner UNIV OF SCI & TECH BEIJING
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