There are many types of recarburizer due to the difference in raw materials and production processes. Commonly used recarburizer includes electrode powder and charcoal powder. High-quality recarburizer generally refers to graphitized recarburizer. At high temperature, carbon atoms are usually arranged in the microscopic shape of graphite, which is called graphitization.
Mixing molten iron can promote recarburization. Therefore, it is much more difficult to recarburize in the medium-frequency induction furnaces with weak mixing power than in the line-frequency induction furnaces with strong mixing power. As a result, recarburization in the medium-frequency induction furnaces may possibly fall behind the melting speed of metal charge.
Attention should be paid to the time of adding recarburizer. If recarburizer is added too early, it may easily adhere to the bottom of the furnace, and the recarburizer attached to the furnace wall will not be easily dissolved into the molten iron. If recarburizer is added too late, it may easily miss the recarburization time, resulting in slow heating.
In addition, there are many factors affecting the effect of the recarburizer. For example, the particle size of the recarburizer affects its absorption rate, which depends on the combined effect of the dissolution and diffusion rate and the oxidation loss rate of the recarburizer.
The particle size of the recarburizer is selected according to the diameter and capacity of the furnace. Generally, the particle size of the recarburizer is positively correlated with the diameter and capacity of the furnace.
