(1) spray graphite powder in the bag
Using graphite powder as carburizer, the injection volume is 40kg/t, and the carbon content of liquid iron is expected to increase from 2% to 3%. The temperature of molten iron before carburization was 1600℃, and the average temperature after carburization was 1299℃. Jet graphite powder carburization, generally use nitrogen as a carrier, but under industrial production conditions, with compressed air is more convenient, and the oxygen combustion in compressed air to produce CO, chemical reaction heat can compensate part of the temperature drop, and CO reducing atmosphere to improve the effect of carburization.
(2) the use of recarburizer when iron
100-300 mesh graphite powder carburizer can be put into the bag, or from the iron tank with the flow into, after the iron liquid fully stirred, as far as possible to make carbon absorption, carbon recovery rate is about 50%.