Oxygen refining medium and low carbon ferrochrome, using liquid carbon ferrochromium as raw material, adding a small amount of lime and fluorite to the molten pool during slagging, adding silicon chromium alloy or ferrochromium to recover the slag chromium. The blowing of micro carbon ferrochromium is only possible under a certain vacuum.
Refining by vacuum solid-state decarburization, using ground ferrochrome as raw material, part of the ground high-carbon ferrochrome is oxidized and roasted as oxidant, added with water glass or other binder, pressed into agglomerates, and dried at low temperature , In a car bottom vacuum furnace, heating and reducing at a vacuum degree of 0.5 to 10 mm Hg and a temperature of 1300 to 1400°C for 35 to 50 hours can obtain micro-carbon ferrochrome with a carbon content of less than 0.03% or even less than 0.01% .
