Three influencing factors of graphitized petroleum coke on smelting

The previous life of graphite petroleum coke was a coking unit used for thermal processing in the petrochemical industry. It mainly processed petroleum coke and some light oil products of poor quality remaining, which were difficult to further process. The decoking produced by natural stone will also be divided into ordinary petroleum coke and high-quality petroleum coke, which is also the starting point of graphitized petroleum coke. The main difference between the two is whether it is used as a raw material for advanced graphite products such as graphite electrodes.

Graphitization can reduce the impurity content, increase the carbon content, and reduce the sulfur content. Casting carburizing agent can greatly increase the consumption of scrap steel, reduce the consumption of pig iron or not use pig iron.

The charging method of electric furnace smelting should be to put the recarburizer together with the scrap steel and other charge into the furnace, and a small amount can be added to the surface of the molten iron. However, it is necessary to avoid adding a large amount of material to the molten iron, so as to avoid the case where the carburizing effect is not obvious due to excessive oxidation, and the carbon content of the casting is insufficient. The amount of recarburizer added is determined according to the proportion of other raw materials and the carbon content.

Graphitized petroleum coke has three major influences on smelting

1. Hot metal carburizing technology can increase graphite nuclei in the smelting process, especially in electric furnaces. The addition of silicon carbide in the cupola smelting can also increase the growth of graphite nuclei in the molten iron and reduce the oxidation of the molten iron.

2. Carbonization is a measure to prevent or reduce the tendency to shrink. Due to the graphitization and expansion during the solidification of molten iron, good graphitization will reduce the tendency of molten iron to shrink.

3. Under the condition of high carbon content, in order to obtain high-strength gray iron castings, the smelting process uses scrap steel and recarburizers to make the molten iron more pure and produce castings with high material properties. Non-polluting clean materials should be used during smelting to avoid leakage or excessive scum.

Generally speaking, the quality requirements of ordinary petroleum coke are not high, and the light oil products produced are also low-quality oil products with high residual carbon value and high metal technology content. Only through secondary processing can the qualified oil be developed. However, natural graphite will appear in nature, and people in the foundry industry often use graphite because artificial graphite has many advantages, such as the porosity, carbon content, and graphitization degree of artificial graphite, which can better meet the requirements. At the same time, petroleum coke is mainly used to produce graphite.