Recarburizer is also known as carbon additive and carbon raiser. It is widely used in steel making and casting and can save 23% of production costs. It is widely used in steel making and casting. According to the process, raw materials and different uses, recarburizer can be divided into different types, in actual use, steel mills and foundries will choose the correct type of recarburizer according to production requirements. The common types are mainly graphite recaruburezer, graphitized petroleum coke recarburizer and petroleum coke recarburizer.
Petroleum coke, calcined coal and coal are the main raw materials for recarburizere. In order to reduce impurities and harmful elements in carbon additive the raw materials need to be acidified before production and the processed raw materials are crushed and frozen using liquid nitrogen. Depending on the process, the carbon additive is produced in different ways. Graphite carbon additive needs to be added to the mixture with graphite material and carbon electrode powder, and dispersed using ultrasonic waves for 10~20 minutes, and then left to stand for 1~2 hours at 150~200℃ and -0.05~-0.1mpa under the protected state of nitrogen gas. After that, after adding free carbon and binder, stirring and making them react for 1~3 hours, the furnace temperature is raised to 1800~2800℃ and held for 5~10 hours to make the presented recarburizer.
The raw material of graphite carbon raiser is petroleum coke powder, after various raw material ratios, pressed into shape, in the oxygen-free environment of 2500~3000℃, the raw material graphitization process. And then use the calcination process to effectively reduce its ash, sulfur and nitrogen and other harmful elements.
According to the different raw materials and production processes, recarburizer can be divided into different types. The raw materials of recarburizer are mainly petroleum coke, calcined coal and anthracite, etc. The processing process is mainly based on calcination and graphitization.
Graphite carbon additive: Low sulfur and low nitrogen high purity graphite, is the main raw material for the production of graphite carbon additive, the graphite is ground into powder and pressed into shape using professional equipment, in the graphitization process, in the high temperature environment, the arrangement of carbon atoms in the microscopic form of graphite, can effectively reduce the content of impurities in the graphite carbon additive, effectively improve its carbon content, reduce sulfur, nitrogen and other harmful elements.
GPC (Graphitized petroleum coke) carbon raiser: The raw material is petroleum coke, which is a by-product produced during the refining of crude oil. After calcining at high temperature and continuing to use the graphitization process to produce graphitized petroleum coke, thus effectively reducing its internal impurities and harmful elements, with the advantages of good insulation performance and high ignition point.
CAC (calcined anthracite carbon) carbon additive: using high quality anthracite as its raw material, it is calcined in a high temperature environment of 1000~1600℃ before production, thus effectively reducing its internal impurities and increasing the carbon content.
| Model | F.C | S | N | Size |
|---|---|---|---|---|
| Calcined Coal | 90%/93% | no data | no data | 1-3mm or 1-5mm |
| Granular Graphite | 90%/95% | 0.05%max | 800 ppm | φ 6mm, cylindrical granules |
| Petroleum Coke | 98.0%min | 0.5%max | 10000 ppm | 1-5mm |
| Graphited Petroleum Coke |
98.0%min | 0.05%max | 300 ppm | 1-5mm |
