Silicon carbide production process

Silicon carbide is produced silica reduction method, the Acheson furnace for resistance, is silica sand and coke in an electric furnace heated to a high temperature of about 2600 degrees carried out, of the formula
sio2 +3 c-sic +2 co
Wherein in the smelting process of CO burn all, in order to improve the permeability of the furnace, usually in the raw materials by adding a small amount of sawdust.
Green silicon carbide in the smelting process, require a relatively high purity silica sand, companies need to add a little salt.
Mainly in the graphite furnace electrode.
The overall process is the charge reaction, the production of silicon carbide and carbon monoxide, which burn carbon monoxide in the reaction, as the reaction proceeds, silicon carbide gradually increased, forming a crystalline tube, the reaction was completed, remove the furnace wall, the outer pull impurities out, the internal shiny crystals is silicon carbide.