Method for producing silica particles with carbon coating for producing silicon or silicon carbide i

专利摘要:
A method of preparing an intermediate composition for the production of silicon or silicon carbide, wherein silicon dioxide particles (quartz sand) are coated with carbonaceous material in a fluidized bed from which the coated particles are extracted as they fall to the bottom of the fluidized bed by virtue of an increase in mass by the coating process. The carbon in the coating should be stoichiometrically equivalent to that required for the ultimate reaction of the silicon dioxide to form either elemental silicon or silicon carbide.
公开号:SU1080740A3
申请号:SU813368377
申请日:1981-06-19
公开日:1984-03-15
发明作者:Ласк Герт-Вильгельм
申请人:Интернешнл Минералс Энд Кэмикал Лаксембург Сосьетэ Аноним (Фирма)；
IPC主号:

专利说明:

2. The method according to claim 1, characterized in that the fluidized bed
they create and support by supplying countercurrent water vapor and inert gas.
one
This invention relates to raw materials for the production of silicon or silicon carbide in an electric furnace, in particular a method for producing silica-coated silica particles for the production of silicon and / or silicon carbide in an electric furnace.
A method is known for producing carbon particles coated with silica for the production of silicon or silicon carbide in an electric furnace, which consists in mixing the silica with a fine-grained carrier of carbon, in particular coal, with the silica and carbon used in the production of silicon. or silicon carbide, or carbon is used in excess of Cl)
A disadvantage of the known process is that the yield of high purity silicon or silicon carbide from the obtained raw material is not satisfactory. In addition, the power consumption required for the production of silicon and silicon carbide is relatively high.
The closest to the invention in its technical essence and the achieved effect is a method for producing particles coated with carbon to produce silicon or silicon carbide in an electric furnace, which includes feeding silica and hydrocarbons into the fluidized bed at 800-1150 ° C.
However, the known method is characterized by an insufficiently high product quality (some of the particles do not have a continuous coating and the adhesion strength of the coating with the particles is insufficient).
The aim of the invention is to improve the quality of the product by creating a continuous hydrocarbon envelope on the silica particles, which has an increased adhesion strength to silica.
This goal is achieved in that according to the method of producing silica particles coated with carbon to produce silicon or silicon carbide in an electric furnace, which includes feeding silica and hydrocarbons into the fluidized bed at elevated temperatures, a heavy oil fraction or carbon coal resin is used as hydrocarbons or coal tar in
a liquid form with a temperature of 250 s, a boiling layer and: is used at 500-700 ° and the obtained parts are covered with carbon from carbon at B0-8-8 ° C are withdrawn from the lower part of the boiling layer, and the particles whose coating contains carbon in an amount smaller stoichiomorphic, mixed with the starting silica and recycled to the fluidized bed.
The fluidized bed is created and maintained by supplying a countercurrent of water vapor and inert gas.
The drawing shows an installation for carrying out the proposed method.
Silica with a temperature of 600-800 ° C is blown into the reactor 1 through line 2. Using water vapor and inert gas supplied separately via pipelines 3, 4, a boiling bed 5 with a temperature of 500-700 ° C is created and maintained. Liquid hydrocarbons with a temperature of 250 ° C are fed into the boiling layer 5 by means of a nozzle, which are fed through the borer b. At the same time, cracking hydrocarbons are applied to the fluidized bed particles to form an oil coke coating. The carbon coated particles are withdrawn from the lower part of the fluidized bed through the pipeline 7. At the same time, those from the outlet with a temperature of 600-800 ° C, which have a coating containing carbon in an amount less than stoichiometric, are fed to the heater B for mixing with the original silica supplied through conduit 9. Products with a stoichiometric carbon coating are withdrawn through conduit 10. Gaseous or condensable hydrocarbons are withdrawn from the upper part of reactor 1 via conduit 11.
Example 1. In a boiling layer of 10 t / h of quartz sand, having a temperature of 500-700 s, 40 t / h of liquid heavy oil fraction or liquid coal tar or liquid coal tar pitch having a temperature are supplied. The layer is fluidized with water vapor supplied in an amount of 10 t / h. The resulting carbon-coated particles having a temperature of 600,800 ° C are withdrawn from the bottom.
a fluidized bed, with part of the particles (16 t / h) being fed to the production of silicon and silicon carbide in an electric furnace, and the remaining particles having a coating with a carbon content lower than stoichiometric; together with the raw material is fed to the heating to the temperature of the BOO-HEO C.
Products are used to produce silicon or silicon carbide in an electric furnace at 1700–1900 ° C or 1900–2200 ° C. This produces 95–97% silicon or silicon carbide with a power consumption of 10–10.2 KWh per kg of product .
Example 2. The product of example 1 (1 kg) is examined for the continuous formation of a carbon shell on it by microscopy and the adhesion strength of the shell with silica to determine the percentage of grains: 50% of the surface of which is free of the carbon shell after processing in an ico mixing drum The rotation speed is 100 rpm and half full of the product. It is established that 90% of the grains are covered with a continuous carbon sheath, and in 10% of the grains 50% of the surface is | from the carbon shell. I: PRI me R 3 (comparative). ; Example 1 is repeated with the difference that the process is carried out
a) at 350-450 ° C using a liquid heavy oil fraction
with temperature (op i);
b) at 750–800 ° C using liquid heavy oil formation with
temperature 250s (experience ji);
c) at EOO-IBO C using gaseous hydrocarbons
(experience (N) ..,
The quality of the products of experiments i-ffi examined in the manner described in example 2.
At the same time establish the following percent of the grains covered with a continuous cover:
55% in the case of experiment I (below the proposed temperature limit); 90% in the case of experiment P (above the proposed temperature limit);
65% in the case of experience § (according to the prototype).
In addition, the following percentage of grains is set, 50% of the surface of which is free of the carbon shell:
40% in the case of experiment 1, 10% in the case of experience, U, 25% in the case of experience w. Comparison of the data of examples 2, 3 indicates the achievement of the objectives of the invention.:

权利要求:
Claims (2)
[1]
1 * METHOD FOR PRODUCING SILICON PARTICLES COATED FROM CARBON in a fluidized bed at elevated temperature, characterized in that, in order to improve the quality of the product due to the creation of particles of silica, a continuous hydrocarbon shell with increased adhesion to silica, the hydrocarbons used heavy oil fraction or coal tar, or coal tar pitch in liquid form with a temperature of 250 ° C, a fluidized bed is used at. 500-700 ⁱⁿ C and the resulting 'silica particles coated with ¹ carbon at 600-800 ° C are removed from the lower part of the fluidized bed, and particles coated with which contains carbon in cols, SU .. 1080740 A. 1080740
[2]
2. The method according to π. 1, they have to be supported by supplying the fluidized bed with current. Water vapor and inert gas.

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AR228156A1|1983-01-31|

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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DE3023297A|DE3023297C2|1980-06-21|1980-06-21|Process for the production of a preliminary product for the production of silicon carbide|

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