Electric silicon thermal smelting of micro carbon ferrochromium Electric silicon thermal smelting of micro carbon ferrochrome is to add chromium ore, silicon chromium alloy and lime to the electric arc furnace, mainly rely on electric heating to melt the charge, silicon in the silicon chromium alloy reduces the chromium ore Made of Cr2O3. The equipment used for electrothermal silicon smelting of micro carbon ferrochromium is an electric arc furnace. It is divided into two types: open and covered, and the power is mostly below 500kV.A, and it has a device for adjusting the voltage on load to meet the needs of different operating periods. The furnace lining is made of magnesia brick, and graphite electrodes are used. The main raw materials of electrothermal silicon smelting micro-carbon ferrochrome are chromium ore, silicon-chromium alloy and lime. Some also come with fluorite and iron scales.
Ferrochromium should be dry and clean lump or concentrate, with a lump of less than 50mm; containing Cr2O3>40%, Cr2O3/∑FeO>2.0, and phosphorus content should not be greater than 0.03%. Choose silicon-chromium alloys with different carbon contents according to the grade of smelted micro-carbon ferrochrome. Smelting of micro-carbon ferrochromium by heat mixing method The process of smelting micro-carbon ferrochrome by heat mixing method is to perform heat mixing operation on the pre-melted chromium ore-lime melt and the hot metal ladle outside the silicon-chromium alloy carrier furnace, thereby preparing micro-carbon ferrochromium . The heat transfer process can be divided into one-step heat transfer method, two-step heat transfer method, and three-step heat transfer method according to the number of staged reduction of Cr2O3 in slag.
