Medium, low, low carbon Ferro Chrome with silicon chromium alloy, chromite and lime as raw materials, the use of 1500 ~ 6000 kva furnace refining silicon, high basicity slag operation (CaO/SiO2 is 1.6 ~ 1.8).Low, low carbon Ferro Chrome is using hot against the law to production on a large scale.Production in the two furnace, a furnace smelting silicon chromium alloy, a furnace melting slag of chrome ore and lime.Refining reaction in two stages in two barrels are: (1) the slag slag furnace injection after first sheng barrels, put a bucket has preliminarily desilication against into the sicr, because of the large amount of slag excess oxidant, desilication fully, can get less than 0.8% 0.02%, low carbon containing silicon micro carbon ferro chrome.(2) the first sheng ladle slag after the reaction (containing about 15% Cr2O3) moved to the second barrel after, the silicon chromium furnace earned silicon chromium alloy (containing silicon 45%) against the heat into the slag, resulting from the reaction of desilication (about 25%) containing silicon, silicon chromium alloy against into the first barrel further desilication, slag containing Cr2O3 below 2 ~ 3% can be abandoned.
Oxygen in the refining, low carbon Ferro Chrome, the use of liquid carbon Ferro Chrome in raw materials, converting to the molten pool when adding a small amount of lime, fluorite slag, iron, silicon chromium alloys or ferrosilicon with recovery of chromium slag.Converting low carbon ferro chrome under certain vacuum degree is possible.
Vacuum solid-state decarburization process refined, with fine grinding of high carbon Ferro Chrome as raw material, which part of the fine grinding of high carbon ferro chrome by oxidizing roasting as oxidant, with water glass or other adhesives, ball pressure, the low After drying, the car type vacuum furnace, the vacuum degree is 0.5 ~ 10 mm hg, temperature of 1300 ~ 1400 ℃ heating reduction under 35 ~ 50 hours, available carbon is less than 0.03% even less than 0.01% of low carbon Ferro Chrome.
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