According to different carbon content, ferrochrome is divided into high carbon ferrochrome (including charging grade ferrochrome), medium carbon ferrochrome, low carbon ferrochrome, micro-carbon ferrochrome, etc. The smelting process of ferrochromium with different carbon content is different. Next, the ferrochromium supplier will explain to you:
1. Low-carbon ferrochromium: There are two main smelting methods for low-carbon ferrochromium: high-carbon ferrochromium refining method and electro-silicon thermal method. The high-carbon ferrochromium refining method is further divided into the refining of high-carbon ferrochromium with chrome ore and the refining of high-carbon ferrochromium with oxygen. When using chrome ore concentrate with high carbon ferrochromium, the refining slag has a larger viscosity and a higher melting point, and the smelting process temperature should be higher. The traditional production method is still electro-silicon thermal method. The electrosilicothermic method is to reduce the oxides of chromium and iron with silicon in the silicon-chromium alloy under the condition of making alkaline slag in an electric furnace to obtain medium and low carbon ferrochromium.
2. Micro-carbon ferrochromium: Micro-carbon ferrochromium is mainly used in the production of stainless steel, acid-resistant steel and heat-resistant steel. Micro-carbon ferrochromium smelting methods include electro-silicon thermal method and thermal mixing method. Electrosilicothermic micro-carbon ferrochromium smelting is to add chrome ore, silicon-chromium alloy and lime into electric arc furnace. Electrosilicothermic micro-carbon ferrochromium smelting mainly relies on electric heat to melt the charge. of Cr2O3. The smelting process of micro-carbon ferrochromium by hot mixing method is to carry out hot mixing operation of pre-melted chrome ore-lime melt and silicon-chromium alloy ladle outside the furnace to obtain micro-carbon ferrochromium.
3. High carbon ferrochromium: The smelting methods of high carbon ferrochromium include blast furnace method, electric furnace method, plasma furnace method, etc. Using a blast furnace can only produce special pig iron with a chromium content of about 30%. As of 2012, most of the high-carbon ferrochromium with high chromium content is smelted in the submerged arc furnace by the flux method.