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Method for producing silicon carbide by adopting multi-furnace series staged melting furnace and special production system

A production method and technology of silicon carbide, applied in the maintenance of furnaces, furnace components, heating chambers, etc., can solve the problems of low single-pass conversion efficiency of materials, continuous separation and reuse of product waste materials, uneven mass transfer and heat transfer, etc. Achieve effective reuse, achieve continuity, and improve conversion rates

Active Publication Date: 2021-06-08
北京绿清科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] One of the purposes of the present invention is to provide a method for producing silicon carbide using multi-furnace series graded melting furnaces to solve the problem of uneven mass and heat transfer in the traditional silicon carbide production process, and to realize the continuous production process of silicon carbide and temperature control at each stage. Overcome the disadvantages of low single-pass conversion efficiency of materials in the traditional silicon carbide production process and continuous separation and reuse of waste materials

Method used

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  • Method for producing silicon carbide by adopting multi-furnace series staged melting furnace and special production system
  • Method for producing silicon carbide by adopting multi-furnace series staged melting furnace and special production system
  • Method for producing silicon carbide by adopting multi-furnace series staged melting furnace and special production system

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Experimental program
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Effect test

Embodiment 1

[0072] Embodiment 1 The method for producing silicon carbide based on the silicon carbide production system of multi-furnace single-layer fluidized melting furnace

[0073] Purify liquid silicon dioxide and water-soluble starch through membrane filtration equipment at room temperature to obtain high-purity raw materials. Mix the purified liquid silicon dioxide, water-soluble starch, wood chips and salt evenly (liquid silicon dioxide and water-soluble starch) The molar ratio of starch is 1:1, the weight of wood chips accounts for 2%-6% of the weight of the total raw materials (silicon source + carbon source + auxiliary materials), and the weight of table salt accounts for 3% of the weight of the total raw materials (silicon source + carbon source + auxiliary materials) -11%) obtain liquid mixed raw material;

[0074] In the drying and crushing device B, the purified liquid mixed raw material and the high-temperature inert gas (mainly Ar gas) at a temperature of 1900-2700°C are ...

Embodiment 2

[0076] The β-SiC products produced in molten state are cooled in a product processing device with cooling function and then packaged for finished products. The produced product is a fine powder β-SiC crystal of about 5 to 8 nanometers, the crystal purity is above 99.9%, and the raw material conversion rate of the whole silicon carbide production process is above 99%. Embodiment 2 The method for producing silicon carbide based on the silicon carbide production system of multi-furnace single-layer fluidized melting furnace

[0077] Purify liquid silica sol and sucrose through membrane filtration equipment at room temperature to obtain high-purity raw materials, and mix the purified liquid silica sol, sucrose, wood chips and salt evenly (the molar ratio of liquid silica sol to sucrose is 1:2, The weight of sawdust accounts for 2%-6% of the weight of the total raw material (silicon source+carbon source+auxiliary material), and the weight of table salt accounts for 3%-11% of the we...

Embodiment 3

[0081] Embodiment 3 Method for producing silicon carbide based on the silicon carbide production system of multi-furnace single-layer fluidized melting furnace

[0082] Purify liquid silicic acid and maltose through membrane filtration equipment at room temperature to obtain high-purity raw materials, and mix the purified liquid silicic acid, maltose, wood chips and salt evenly (the molar ratio of liquid silicic acid to maltose is 1:4 , the weight of sawdust accounts for 2%-6% of the total raw material (silicon source+carbon source+auxiliary material) weight, and the weight of table salt accounts for 3%-11% of the total raw material (silicon source+carbon source+auxiliary material) weight) to obtain liquid mixed raw materials ;

[0083] In the drying and crushing device B, the purified liquid mixed raw material and the high-temperature inert gas (mainly Ar gas) at a temperature of 1900-2700°C are subjected to counter-current or co-current drying to dry the purified liquid raw ...

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Abstract

The invention discloses a method for producing silicon carbide by adopting a multi-furnace series staged melting furnace and a special production system. The system comprises the following steps that a liquid raw material is purified, dried and crushed, then sequentially passes through a single bed layer of each stage of furnace body in the multi-furnace single-layer series staged melting furnace, and is gradually molten to a liquid state for a melting reaction to generate silicon carbide. The invention further discloses the special production system based on the multi-furnace series staged melting furnace, and each stage of melting furnace is only provided with one bed layer for a fluidized melting reaction. According to the method, the liquid raw material easy to purify is adopted, a staged melting production mode of the multi-furnace series staged melting furnace is applied, a temperature of a furnace layer is accurately controlled by utilizing a graphite heating core so as to control a product type, inert gas is used as fluidizing gas to generate turbulence in a molten material of the bed layers, a continuous silicon carbide production process is realized, the product stability is ensured, the reaction time is shortened to 1-2 hours, the production efficiency is greatly improved, the effective recycling of energy is realized, and the energy consumption and the production cost are reduced.

Description

technical field [0001] The invention relates to a silicon carbide production method and a special production system, in particular to a production method of silicon carbide using multi-furnace series staged melting furnaces and a special system for realizing the method, belonging to the field of silicon carbide production equipment. Background technique [0002] Silicon carbide materials are widely used and are mainly used in solar photovoltaic industry, semiconductor industry, and piezoelectric crystal industry. At present, the preparation of conventional silicon carbide mainly comes from artificial synthesis, and its preparation methods mainly include sublimation method and melting method. Among them, the sublimation method is to produce silicon carbide in a carbon tube furnace with a vacuum of 10-30 mm Hg by sublimation of the silicon carbide charge in the inner wall of the carbon tube furnace; the melting method is to strictly control the temperature in an electric furna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D7/02F27D7/06F27D17/00F27D19/00
CPCF27D7/02F27D7/06F27D19/00F27D17/008Y02P20/10
Inventor 王宁
Owner 北京绿清科技有限公司
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