Chromium ore refining high carbon ferrochrome: with chromium ore refining high carbon ferrochrome, refining slag has a larger viscosity and higher melting point, smelting process temperature must be high. Therefore, the power consumption is high, the lining life is short, and the carbon content is not easy to fall down. Blowing high carbon ferrochrome with oxygen has great advantages, such as high productivity, low cost and high recovery rate. At present, the traditional production method is still electric silicon thermal method. The electrosilicon thermal method is to reduce the oxide of chromium and iron with silicon in the silicon chromium alloy under the condition of alkaline slag in the electric furnace, so as to produce medium and low carbon ferrochromium.
Oxygen blowing medium and low carbon ferrochrome: the equipment used in oxygen blowing process for medium and low carbon ferrochrome is converter, so it is called converter method. According to different oxygen supply methods, oxygen blowing can be divided into side blowing, top blowing, bottom blowing and top and bottom blowing four. Our country uses the top blowing converter method. The oxygen blowing method is to directly blow oxygen into liquid high carbon ferrochrome to decarbonize it and produce low carbon ferrochrome. The main elements in high carbon ferrochrome are chromium, iron, silicon and carbon, all of which can be oxidized. The main task of oxidation blowing high carbon ferrochrome is to decarbonize and preserve chromium. When oxygen is blown into the liquid high-carbon ferrochrome, the chromium and iron content account for more than 90% of the total alloy, so the first oxidation is chromium and iron, and then these oxides oxidize the silicon in the alloy. Due to the oxidation of chromium, iron and silicon, the temperature of the melting pool increases rapidly, and the decarbonization reaction develops rapidly. The higher the temperature, the more conducive to the decarbonization reaction, and can inhibit the oxidation reaction of chromium, and the lower the carbon in the alloy can be.
