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Smelteproces af silicium til kemisk industri
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Smelteproces af silicium til kemisk industri

Smelteproces af silicium til kemisk industri

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Produktbeskrivelse

Den teknologiske proces med silicium til kemisk brug omfatter ovnladningsforberedelse, elektrisk ovnsmeltning, siliciumraffinering og støbning og knusning til fjernelse af slaggeindeslutninger. Alle råvarer skal gennemgå nødvendig behandling, før ladningen klargøres. Silicaen knuses i kæbeknuseren, indtil størrelsen af ​​stykkerne ikke er mere end 100 mm, og stykkerne mindre end 5 mm sigtes fra og vaskes med vand. Fordi fragmenterne i ovnen smeltes i den øvre del af ovnen, reduceres ladningens gaspermeabilitet, hvilket gør produktionsprocessen vanskelig. Petroleumskoks har en relativt høj elektrisk ledningsevne, så den skal brydes til en størrelse på højst 10 mm, og mængden af ​​petroleumskokspulver skal kontrolleres. Fordi det brænder direkte på ovnmundingen, vil det forårsage utilstrækkeligt reduktionsmiddel.

 

I produktionen af ​​kemisk silicium kan bituminøst kul fuldstændigt erstatte trækul, såsom Hunan Zhuzhou raffineret bituminøst kul, det faste kulstof når 77,19 procent, det flygtige stof er 19,4 procent, askeindholdet er 3,41 procent, Fe2O3-indholdet er {{8 }}.22 procent, Al2O3-indholdet er 0,99 procent, og CaO-indholdet er 0,17 procent. . Ifølge produktionspraksis er det muligt at bruge denne form for bituminøst kul til at smelte kemisk silicium.

 

Blokke og spåner til fremstilling af silicium til kemisk brug forarbejdes med tømmerfræsere og flishuggere. Det kulstofholdige reduktionsmiddel i ovnladningen er hovedsageligt petroleumskoks og bituminøst kul, og mængden af ​​træblokke og træflis afhænger af ovnforholdene. Træ bruges ikke i produktionen, men produktkvaliteten er mere stabil. Forholdet mellem ladningen bestemmes i henhold til kvaliteten af ​​det produkt, der skal fremstilles. Andelen af ​​petroleumskoks og bituminøst kul bestemmes i henhold til mængden af ​​kulstof, der kræves for hvert parti malmsilicium. Forholdet mellem petroleumskoks og bituminøst kul har stor indflydelse på ladningens arbejdsmodstand.

 

Efter at hver komponent i ovnladningen er vejet, blandes ladningen jævnt, og efter at ovnen er stødt, tilsættes den ensartet blandede ladning til ovnen. Hold en vis højde på materialeoverfladen og foder jævnt.

 

Kemisk siliciumproduktion er kontinuerlig. Forholdene inde i ovnen er heller ikke evige. Kemisk siliciumproduktion er en proces, hvor elektrisk energi omdannes til varmeenergi i en elektrisk ovn, og derefter bruges varmeenergien til direkte at opvarme materialet for at frembringe en kemisk reaktion. Derfor er de elektriske egenskaber i ovnen meget vigtige. Smelteoperationen er lukket bue for at opretholde højtemperaturovnen, forbedre den termiske effektivitet og forbedre udnyttelsesgraden af ​​den elektriske ovn. I forskningen anvendes en metalsiliciumovn med en kapacitet på 3200KVA og 6300KVA. Udsmeltningen udføres ved at simre i en vis periode og regelmæssigt koncentreret fodring. Under normale omstændigheder er det svært for ladningen at synke automatisk, og det er generelt nødvendigt at tvinge ladningen til at synke. Ovnens tilstand er let at svinge og svær at kontrollere. Derfor er det nødvendigt at bedømme korrekt og håndtere det i tide i produktionen. Ovnen fyres hver 4. time til skuring og støbning, og slaggen knækkes og sorteres til lager.

 

Smelting process of silicon for chemical industry The technological process of silicon for chemical use includes furnace charge preparation, electric furnace smelting, silicon refining and casting, and crushing for removing slag inclusions. All raw materials must undergo necessary treatment before the charge is prepared. The silica is crushed in the jaw crusher until the size of the pieces is not more than 100mm, and the pieces smaller than 5mm are screened out and washed with water. Because the fragments in the furnace are melted in the upper part of the furnace, the gas permeability of the charge is reduced, making the production process difficult. Petroleum coke has a relatively high electrical conductivity, so it must be broken to a size of no more than 10mm, and the amount of petroleum coke powder must be controlled. Because it burns directly on the furnace mouth, it will cause insufficient reducing agent. In the production of chemical silicon, bituminous coal can completely replace charcoal, such as Hunan Zhuzhou refined bituminous coal, the fixed carbon reaches 77.19%, the volatile matter is 19.4%, the ash content is 3.41%, the Fe2O3 content is 0.22%, the Al2O3 content is 0.99%, and the CaO content is 0.17%. . According to production practice, it is feasible to use this kind of bituminous coal to smelt chemical silicon. Blocks and chips for the production of silicon for chemical use are processed with timber cutters and wood chippers. The carbonaceous reducing agent in the furnace charge is mainly petroleum coke and bituminous coal, and the amount of wood blocks and wood chips depends on the furnace conditions. Wood is not used in production, but the product quality is more stable. The ratio of the charge is determined according to the grade of the product required to be produced. The proportion of petroleum coke and bituminous coal is determined according to the amount of carbon required for each batch of ore silicon. The ratio of petroleum coke and bituminous coal has a great influence on the working resistance of the charge. After each component of the furnace charge is weighed, the charge is mixed evenly, and after the furnace is pounded, the uniformly mixed charge is added to the furnace. Keep a certain height of the material surface and feed evenly. Chemical silicon production is continuous. The conditions inside the furnace are not eternal either. Chemical silicon production is a process in which electric energy is converted into heat energy in an electric furnace, and then the heat energy is used to directly heat the material to produce a chemical reaction. Therefore, the electrical characteristics in the furnace are very important. The smelting operation is closed-arc to maintain the high temperature furnace, improve the thermal efficiency, and improve the utilization rate of the electric furnace. In the research, a metal silicon furnace with a capacity of 3200KVA and 6300KVA is used. The smelting is carried out by simmering for a certain period of time and regular concentrated feeding. Under normal circumstances, it is difficult for the charge to sink automatically, and it is generally necessary to force the charge to sink. The furnace condition is easy to fluctuate and difficult to control. Therefore, it is necessary to judge correctly and deal with it in time in production. The furnace is fired every 4 hours for scouring and casting, and the slag is broken and sorted into storage.Smelting process of silicon for chemical industry The technological process of silicon for chemical use includes furnace charge preparation, electric furnace smelting, silicon refining and casting, and crushing for removing slag inclusions. All raw materials must undergo necessary treatment before the charge is prepared. The silica is crushed in the jaw crusher until the size of the pieces is not more than 100mm, and the pieces smaller than 5mm are screened out and washed with water. Because the fragments in the furnace are melted in the upper part of the furnace, the gas permeability of the charge is reduced, making the production process difficult. Petroleum coke has a relatively high electrical conductivity, so it must be broken to a size of no more than 10mm, and the amount of petroleum coke powder must be controlled. Because it burns directly on the furnace mouth, it will cause insufficient reducing agent. In the production of chemical silicon, bituminous coal can completely replace charcoal, such as Hunan Zhuzhou refined bituminous coal, the fixed carbon reaches 77.19%, the volatile matter is 19.4%, the ash content is 3.41%, the Fe2O3 content is 0.22%, the Al2O3 content is 0.99%, and the CaO content is 0.17%. . According to production practice, it is feasible to use this kind of bituminous coal to smelt chemical silicon. Blocks and chips for the production of silicon for chemical use are processed with timber cutters and wood chippers. The carbonaceous reducing agent in the furnace charge is mainly petroleum coke and bituminous coal, and the amount of wood blocks and wood chips depends on the furnace conditions. Wood is not used in production, but the product quality is more stable. The ratio of the charge is determined according to the grade of the product required to be produced. The proportion of petroleum coke and bituminous coal is determined according to the amount of carbon required for each batch of ore silicon. The ratio of petroleum coke and bituminous coal has a great influence on the working resistance of the charge. After each component of the furnace charge is weighed, the charge is mixed evenly, and after the furnace is pounded, the uniformly mixed charge is added to the furnace. Keep a certain height of the material surface and feed evenly. Chemical silicon production is continuous. The conditions inside the furnace are not eternal either. Chemical silicon production is a process in which electric energy is converted into heat energy in an electric furnace, and then the heat energy is used to directly heat the material to produce a chemical reaction. Therefore, the electrical characteristics in the furnace are very important. The smelting operation is closed-arc to maintain the high temperature furnace, improve the thermal efficiency, and improve the utilization rate of the electric furnace. In the research, a metal silicon furnace with a capacity of 3200KVA and 6300KVA is used. The smelting is carried out by simmering for a certain period of time and regular concentrated feeding. Under normal circumstances, it is difficult for the charge to sink automatically, and it is generally necessary to force the charge to sink. The furnace condition is easy to fluctuate and difficult to control. Therefore, it is necessary to judge correctly and deal with it in time in production. The furnace is fired every 4 hours for scouring and casting, and the slag is broken and sorted into storage.

 

Produktindhold
Produktkarakterer Kemisk sammensætning Kemisk sammensætning Kemisk sammensætning Kemisk sammensætning
    Urenheder (procent) Urenheder (procent) Urenheder (procent)
  Si indhold (procent) Fe Al Ca
1101 99.79 0.1 0.1 0.01
2202 99.58 0.2 0.2 0.02
2502 99.48 0.25 0.25 0.02
3303 99.37 0.3 0.3 0.03
411 99.4 0.4 0.1 0.1
421 99.3 0.4 0.2 0.1
441 99.1 0.4 0.4 0.1
551 98.9 0.5 0.5 0.1
553 98.7 0.5 0.5 0.3
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