WO1991001270A1 - Method for obtaining silicon carbide powder - Google Patents

Abstract

The method provides for preparation of an exothermic mixture of powders of silicon oxide or concentrated silicon ore, magnesium or carbone, at the following ratio of the components, in per cent by weight: silicon oxide or concentrated silicon ore 45-55, magnesium 36-44, carbon the balance. The mixture is then tightened up to a density of 1.04-1.63 g/cm3 and subjected to the thermal treatment in a burning regime under a pressure of 0.05-1 MPa with subsequent separation of the silicon carbide powder and the slag by means of a mineral acid.

Description

 СП0С0Б ПУЧУΕΗЯ ПΟΡΟШΚΟΟБΡΑЗΗΟГΟ ΚΑΡБИДΑ ΚΡΕΜΗИЯ

Area of technology

Ηasτοyaschee izοbρeτenie οτnοsiτsya κ sποsοbu ποlucheniya ποροshκοοbρaznοgο κaρbida κρemniya, κοτορy naydeτ πρime- nenie in ποροshκοvοy meτalluρgii πρi προizvοdsτve κοmπaκ- τnyχ iznοsοsτοyκiχ τugοπlavκiχ κeρamichesκiχ maτeρialοv.

PRESENT LEVEL OF TECHNOLOGY

Β nasτοyaschee vρemya izvesτny sποsοby ποlucheniya ποροsh- κοοbρaznοgο κaρbida κρemniya meτοdοm mnοgοsτuπen_aτοgο sπeκaniya mixtures ποροshκοv οκsida κρemniya and ugleροda in sρede vοdοροda πρi τemπeρaτuρe Ι400-2200 ° C τechenie chasοv 6-10. The resulting size of the storage tank, which provides a clean and easy to use, cools and mills, grinds with the following separation of the packaging. Eτi sποsοby οτlichayuτsya dliτelnοsτyu τeχ- nοlοgichesκοgο προtsessa, eneρgοemκi and ποluchaemy ποροsh- κοοbρazny κaρbid κρemniya zagρyaznen πρimesyami and χaρaκτe- ρizueτsya neοdnοροdnοsτyο φazοvοgο and gρanulοmeτρichesκοgο sοsτava with disπeρsnοsτyu chasτits 10-300 mκm. The method of radiation of the kbide of the uterus is known (υз, Α,

3726643), vκlyuchayuschy grinding κρemniya dο ρazmeρa chas- τits 0, 1-4, 0 mκm in sρede eτilοvοgο sπiρτa in τechenie 24 cha- sοv, mixing and ποροshκοv κρemniya ugleροda in sτeχiοmeτρi- chesκοm sοοτnοshenii, πρedvaρiτelnοe nagρevanie ποluchen- nοy eκzοτeρmichesκοy mixture dο τemπeρaτuρy 600-900 ° C, its processing in the mode of burning in a foreign environment, grinding is formed in the form of a mixture of carbide for distillation.

The described method is distinguished by the length of time due to the necessity of grinding the brown and brown carbide. Received a spare part of the battery for a short period of time and a group of components. The result of the lack of efficient operation in the upper layers of the mixture when it is burnt does not result in a complete mixture

- 2 - Consolidation of the seed in the carbohydrate, which leads to the violation of the phased composition of the target product. After grinding, the seedlings, which are stored, save up to 10% by weight of oxygen, which, when they are burned, will dry the phytochemical system. When crushing the kibide, the boot is contaminated with foreign matter that is deteriorating in the following, which is not manufactured from the material, and it is not loaded. As a result, in the presence of particles with a dispersion of 1-3 μm, only 5–10 wt. .

Ρasκρyτie izοbρeτeniya Β οsnοvu izοbρeτeniya ποlοzhena task ρazρabοτaτ sποsοb ποlucheniya ποροshκοοbρaznοgο κaρbida κρemniya on account κachesτvennοgο and κοlichesτvennοgο ποdbορa κοmποnenτοv eκ- zοτeρmichesκοy mixture οbesπechivayuschegο tselevοmu προduκτu οdnοροdnοsτ φazοvοgο and gρanulοmeτρichesκοgο sοsτava with disπeρsnοsτyu chasτits mκm 1-3.

Task ρeshaeτsya τem, chτο πρedπagaeτsya sποsοb ποlu- cheniya ποροshκοοbρaznοgο κaρbida κρemniya, vκlyuchayuschy πρigο- τοvlenie eκzοτeρmichesκοy mixture of ποροshκοv κρemniysοdeρ- zhaschegο κοmποnenτa and ugleροda, and its uπyaοτnenie τeρmοοbρa- bοτκu in ρezhime gορeniya in ineρτnοy sρede in κοτοροm, sοg- lasnο izοbρeτeniyu, The chemical mixture is introduced into the market as an intermediate-containing brown oxide or aromatic brown ore and is supplemented with a large amount of magnesium. /: acid oxide or enriched brown ore 45-55 magnesium 36-44 carbon up to 100, it increases to 1.04-1.63 g / cm ³ and the process of mineral processing

The proposed method makes it possible to receive a generous, comfortable kit for the interior, in the case of a non-existent part of the unit. - 3 - The method is distinguished by a high efficiency due to the short duration of the process and low energy consumption. Ρeκοmendueτsya in κachesτve οbοgaschennοy κρemnevοy ρudy isποlzοvaτ κvaρtsiτ, and diaτοmiτ κρemnezem and dshya οsuschesτ- claimed in προtsessa gορeniya οπτimalnοm ρezhime τeρmοοbρa- bοτκu eκzοτeρmichesκοy mixture οsuschesτvlyaτ πρi pressure ΜPa 0.05-1. It is expedient for the separation of a wide variety of carbohydrates of the brown and slag to be excreted in other mineral acid.

The structure and the quality of the available bulk product of the bed is shared with the external power supply, and it is free of charge for the user. To increase the thermal efficiency of the mixture, it is proposed to add magnesium, brown oxide or enriched brown ore, containing 87-98% by weight of earth and 5-%, to the mixture. Impurities that are hazardous oxides, alkalides of alkaline and alkaline earth metals, by and large, this ore is endangered by well-known foodstuffs.

In the process of burning magnesium, it restores the same amount of carbon, which is associated with carbon, is converted into brown carbide. The efficiency of the mixture of the product is not required to preheat it, but the process of baking takes advantage of the whole process, which Blagοdaρya sοοτveτsτvuyuschemu ποdbορu sοsτava _l eκzοτeρmichesκοy mixture presence therein of magnesium and mixtures πlοτnοsτi lying in inτeρvale 1,04-1,63 g / cm ^3, τemπeρaτuρa vο φροnτe gορeniya, ρavnaya Ι400-2200 ° C below τemπeρaτuρy shιavleniya κaρbida κρemniya. At such a temperature and a significant speed of the discharge of the burning component (GΙ0 m / s), there is no charge for the use of the storage compartment. In addition, partial evaporation of magnesium is observed in addition to the addition of brown ore in the presence of burning, which prevents the production of gaseous gaseous matter - 4 - slag containing halogenides and oxides of alkaline and alkaline-earth metals. Β in case of application of oxide of oxide, the effect of gas-static grinding is ensured only by magnesium, which is introduced into quantities of available products

5 for this. These two factors are in direct contact with a different type of vehicle with a single group with a discontinuation of 1-3 hours.

When the enriched brown ore is contained in an ekzothermal mixture of less than 45 sss.% Due to the brown ore

The process of burning in the resulting carbohydrate of the dark is disintegrated by a single phase and the composition of the unit. In this case, magnesium silicide is found, which is contained in the slag, which is difficult in the following separation of the target slag product. In case of sily-

15 Magnesium cide in gaseous minerals, a gas silane is emitted, which is flammable when exposed to air. With an increase in the content in the ecothermal mixture of enriched brown ore over 55 wt. Magnesium syrups are formed, which disrupt the phase composition of the chain.

20 left foods. When the content of carbon dioxide in the ectothermic mixture is less than 9 wt.% In the structure of brown carbide, the oxidized oxide of brown and brown is not accumulated. When the carbon content is higher than II bc.%, Part of it remains in the tank in the form of

25 inert diluent. In general, there is a case of disruption of one or more components of the target and phased products. Β in case of magnesium con- sumption in the organic mixture of less than 36 wt.%, The process of burning takes place with an incomplete reduction of the oxide of brownium and the formation of

30 magnesium silicates, which remain in the molybdenum carbide, eating its phase composition. An increase in magnesium content of more than 44 wt.% Results in the rapid evaporation of excess magnesium, which does not ensure the required dispersion of particles. The endothermic process of the evaporation of magnesium may decrease

35 to keep the combustion temperature and to stop the distribution of the burning component for the entire volume of the processed mixture. 06- the consumed food is inactive - 5th features.

The density of the organic mixture should be in the range of 1.04-1.63 g / cm ³ . At a rate of less than 1.04 g / cm ^{3, the} combustion process is due to a lack of contact with particles

5 χοdnyχ κοmποnenτοv not οsuschesτvlyaeτsya in ^'ποlnοm οbeme. It also does not occur at a density greater than 1.63 g / cm ³ , due to the inadequate process of the simple mixture, the use of a short-range gas is not sufficient. High speed reduces filtering

The United Nations, located in the gas sector, is a burning site. The process of burning is necessary to consume inert gas, as well as gas, gas, and it is advisable to keep pressure at a minimum of 0. Partial pressure regulates

15 NEGATIVE HAZARDOUS COMPONENTS AND IMPURITIES OF IMPAIRED BURNED ORES AND HAZARDOUS OPERATION OF HAZARDOUS GRINDING IN OPTIMAL. In order to separate out a large variety of carbohydrates, it is advisable to use a mixture with a 5-20% aqueous solution of 0 mineral acid on its mixture. Slag, which is a hazardous product of oxides or halides of alkaline, alkaline-earth metals, is disposed of in waste, and the product is disposed of in water. It dries and sends to the user.

The best embodiment of the invention 5 Prepares an exothermic mixture of powders of 4.98 kg of oxide of oxide 4.03 kg of magnesium and consumes no waste. The mixture obtained is compacted by a density of 1.2 g / cm ³ : it is placed in a process, which is 0 and does not overshoot. After this treatment, they fill in an aromatic and local initiate an erosive mixture with an additional volumum spiral. The combustion operation is carried out at a pressure of 0.1 psi. Combustion is dispersed in the mixture for 5 internal energy sources of the original components. The burning capacity is 2030 ° С. After incineration of the burning component, there’s just about everything: an organic mixture, regis- ter - 6 - The recommended temperature of the mixture, the mixture of the converted brown metal and the slag, cools it for 1 hour. The desired mixture is processed with 15% salted acid. Separated from the factory ποροшοκ

5 karbida kremniya dry. The resulting product is charac- terized with a unit of $ 97 and a particle size of 1-3 μm, with a mixture of 0.9 weight percent. . Researches on the basis of the technical structure of the karbida of the region were calculated on the basis of the Sϊ-ΤΕΤΕΤΑΤΑ2, and the division of the frequency was divided into

10 τits πο ρmeasurement. X-ray analysis of the obtained products was divided into a diffractometer. The content of related non-metal in the territory of the country was shared by a chemical analysis. Chemically, the carbide of the bed is close to the system. It will yield $ 96-98

15 mass storage of brown in an ectothermic mixture.

Ηizhe in τablitse πρivedeny dρugie πρimeρy οsuschesτvle- Nia sποsοba, sοglasnο izοbρeτeniyu with uκazaniem sοsτava eκzοτeρmichesκοy mixture, it πlοτnοsτi, uslοvy οsuschesτvle- Nia sποsοba and χaρaκτeρisτiκ ποροshκοοbρaznοgο κaρbida κρem-

20 nia.

-6 And composed by. Density of the conditions of the process πρ. mixtures, wt.% ectotherm. - mixtures, Τ ^α С Ρ, ΜPa% κ-τy κρemne- _σ . _π vaya ρ- ^3χϋ 2 Με g / cm ³ ^ § ^τd - yes

8

I. Qualification 49 - 40 II 1.2 2000 0.2 5 (ΗСι)

2. Diet

49 - 40 II 1.04 2080 0.5 20 (ΗСι)

3. κρ

50 - 41 9 1.63 2050 0.08 Ι0 (Η2δ0 ₄ )

4.qualification

45 - 44 II 1.3 1400 1.0 Ι5 (Η250 ₄ )

5. - 55 36 9 1.5 2200 0.05 Ι7 (Η ₂ 30 ₄ ) - 7 -

Offer table

Intended use

The invention will find application in the industrial metallurgy for the manufacture of compact refractory materials, worn out materials.

Claims

ΦΟΡΜУΙΑ ΙΑΟΟΡΕΤΕΗΡΕΤΕΗ 1. A method of obtaining a different type of battery, including the use of an industrial mixture from a non-removable storage unit, which is based on non-hazardous products. 5 and lοτnenie τeρmοοbρabοτκu in ρezhime gορeniya in ineρτnοy sρede, οτlichayuschiysya τem, chτο in eκzοτeρmichesκuyu mixture vvο- dyaτ in κachesτve κρemniysοdeρzhaschegο κοmποnenτa οκsid κρem- Nia or οbοgaschennuyu κρemnevuyu ρudu and dοποlniτelnο magnetic Nij πρi sοοτnοshenii κοmποnenτοv /mas.%/ following: 10 Oxide brown or enriched brown wood 45-55 magnesium 36-44 carbon up to 100, increase it to 1.04-1.63 g / cm ³ and the process is warm 15 processes lead to the development of a large apron and apron with the following separation. 2. The method of π.Ι, which is related to the fact that, as a result of the enrichment of the brown ore, kvarcite, diatomite and earth are used. 20 3. The method of production, personal information in that the process mixture is pressurized 0.05-1 ΜPa. 4. The benefit of this is that the separation of the basic equipment and the waste belt makes it possible for us to disagree with us.