Micro - carbon ferrochrome powder is mainly used in the production of stainless steel, acid - resistant steel and heat - resistant steel. Smelting methods include electric silicon thermal method and thermal transfer method.
Smelting method: electrosilicon thermal method smelting micro-carbon ferrochrome powder electrosilicon thermal method smelting micro-carbon ferrochrome powder is chromium ore, silicon chromium alloy and lime into the arc furnace, mainly rely on electric heating to melt the charge, the silicon in the silicon-chromium alloy reduction chromium ore Cr2O3 and made.
Electric arc furnace is the equipment used in electrosilicon thermal process to smelting micro-carbon ferrochrome powder. It is divided into two types: open and covered. The power is mostly below 500kV.A, and it is equipped with A device for on-load voltage regulation to meet the requirements of different operating periods. The lining is made of magnesia brick and graphite electrode is used. The main raw materials for electrosilicon thermometallurgy of micro - carbon chromium iron powder are chromium ore, silicon - chromium alloy and lime. Some are added with fluorite and iron scales. Chromium ore shall be a dry, clean lump ore or concentrate with a lump size less than 50mm; Contains 40% Cr2O3>, Cr2O3/∑FeO>2.0, and the phosphorus content should not be greater than 0.03%. Select si-Cr alloys with different carbon content according to the grade of the microcarbon ferrochrome powder smelted.
The process of smelting micro - carbon ferrochrome powder by heat exchange process is to prepare micro - carbon ferrochrome powder by heat exchange operation in pre-melted chrome ore - lime melt and si-Cr alloy ladle. The heat exchange process can be divided into one-step heat exchange method, two-step heat exchange method and three-step heat exchange method according to the number of stage reduction of Cr2O3 in slag