Product description
Carburizers, as the name implies, are used to increase the carbon content in the molten iron. The commonly used charge in smelting are pig iron, scrap steel, and return charge. The carbon content of pig iron is high, but the purchase price is higher than that of scrap steel. Therefore, Increasing the amount of scrap steel, reducing the amount of pig iron, and adding carbonizers can play a certain role in reducing the cost of castings.
There are many kinds of raw materials for recarburizers, and the production processes are also different, including wood carbon, coal carbon, coke, graphite, etc., among which there are many small types under various classifications. Recarburizers generally refer to graphitized recarburizers. Under high temperature conditions, the arrangement of carbon atoms is in the microscopic shape of graphite, so it is called graphitization. Graphitization can reduce the content of impurities in the recarburizer, increase the carbon content of the recarburizer, and reduce the sulfur content.

Type parameter

Instructions
Furnace input method
The recarburizer is suitable for smelting in the induction furnace, but the specific use varies according to the process requirements.
(1) The recarburizer is used in the intermediate frequency electric furnace smelting, and 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) If the carbon content is insufficient to adjust the carbon content, first clean the slag in the furnace, add a recarburizer, heat the molten iron, electromagnetic stirring or manual stirring to dissolve and absorb the carbon, and the recovery rate can be about 90%. The low temperature carburizing process is adopted, that is, only part of the charge is melted, and when the temperature of the molten iron is low, all the carburizers are added to the molten iron at one time, and at the same time, the solid charge is pressed into the molten iron to prevent the iron from being exposed. liquid surface. In this method, the carburization of molten iron can reach more than 1.0%.
Carburizing outside the furnace

(1) Graphite powder is sprayed inside the bag
Graphite powder is used as recarburizer, and the blowing amount is 40kg/t, which is expected to increase the carbon content of the molten iron from 2% to 3%. As the carbon content of molten iron increases gradually, the utilization rate of carbon content decreases. The temperature of molten iron before carbonization is 1600 °C, and the average temperature after carbonization is 1299 °C. To increase carbon by spraying graphite powder, nitrogen is generally used as the carrier, but under industrial production conditions, it is more convenient to use compressed air, and the combustion of oxygen in the compressed air produces CO, the heat of chemical reaction can compensate for part of the temperature drop, and the reducing atmosphere of CO is conducive to Improve carbonization effect.
(2) Use recarburizer when tapping
The 100-300 mesh graphite powder recarburizer can be placed in the bag, or flushed from the tapping slot with the current, and fully stirred after the molten iron is discharged to dissolve and absorb carbon as much as possible, and the recovery rate of carbon is about 50%.