Use of Recarburizer

1. Furnace input method:

Recarburizer is suitable for melting in induction furnace, but the specific use is not the same according to the process requirements.
(1) The use of recarburizer in medium-frequency electric furnace melting can be added to the middle and lower parts of the electric furnace according to the ratio or carbon equivalent requirements, and the recovery rate can reach more than 95%;
(2) Molten iron if the amount of carbon is insufficient to adjust the carbon time, first clean the molten slag in the furnace, and then add the recarburizer, through the liquid iron heating, electromagnetic stirring or artificial stirring to dissolve the carbon absorption, the recovery rate can be about 90, if the low temperature carburizing process, that is, the charge only melts part of the molten iron temperature is low, all the carburizing agent is added to the liquid iron at one time. At the same time, it is pressed into the iron liquid with solid charge to keep it from exposing the iron liquid surface. The carburization of liquid iron in this method can reach more than 1.0%.

2. Outside the furnace carburizing:

(1) The package is sprayed with graphite powder, graphite powder is used as a recarburizer, and the blowing amount is 40kg/t, which is expected to increase the carbon content of liquid iron from 2% to 3%. As the carbon content of liquid iron gradually increased, the utilization rate of carbon decreased. The temperature of liquid iron before carburization was 1600℃, and the average temperature after carburization was 1299℃. Graphite powder carburization, generally using nitrogen as the carrier, but in industrial production conditions, compressed air is more convenient, and the oxygen in the compressed air combustion to produce CO, chemical reaction heat can compensate for part of the temperature drop, and CO reduction atmosphere is conducive to improving the carburization effect.
(2) The use of recarburizer when iron, can be 100-300mesh graphite powder recarburizer into the package, or from the iron trough with the flow into, after the iron liquid is fully stirred, as far as possible to dissolve carbon absorption, carbon recovery rate of about 50%.