Method for producing low-carbon ferrosilicon chromium in electric arc resistance furnaces

摘要

the object of the application is the way of low carbon u017celazokrzemochromu electric furnaces u0142ukowo - resistance heated.process for the production of low carbon u017celazokrzemochromu electric furnaces u0142ukowo - resistance heated by conducting redukcyjnej in atmosphere, in the presence of carbon, the smelting raw mix, consisting of wysokowu0119glowego ferro chromium przeru00f3bczego and kwarcytu,periodic trigger liquid u017celazokrzemochromu vats trigger and giving him a refining process in the refining, characterised by the fact that at the time of the trigger into the vat and vat to refining, to smooth u017celazokrzemochromu introduces silica dust originating from pro cesu purification of gases from furnaces for the production of silicon alloys.silica dust contains at least 92% by weight of amorphous silica, having strong binding properties of silicon carbide, sic and forming on the surface of the liquid metal, a layer of slag on the properties of application of thermal blankets, which during at least 120 minutes utrzymyw ana is the temperature in the liquid u017celazokrzemochromu, preferably 1500 - 1400u00b0c.the dust grains are spherical silica with a specific surface area, preferably from 15 to 35 m2 / g, whose size is not greater than 0045 mm, and the apparent density of dust shall not exceed 250 kg / m3.