What are the differences between different carbon additives?

The quality of different carbon additives varies. For instance, there are graphite carbon additives and coal-based carbon additives. Although they are both carbon additives, they differ in basic characteristics, absorption coefficients, prices, advantages and disadvantages, etc. It is not very large, but if not applied properly, it can also affect their carbon-increasing effect.

1. The raw materials of the two types of carbon additives are different: the graphite carbon additive is made from artificial graphite that has been graphitized at 2830 degrees, while the coal-based carbon additive is made from anthracite.

2. The basic characteristics of the two carbon additives are different: Graphite carbon additive has the advantages of low sulfur, low nitrogen, low phosphorus, high temperature resistance and good electrical conductivity. High-quality coal-based carbon additives cannot achieve the desired carbon increase effect.

3. Different absorption coefficients: The absorption coefficient of graphite carbon additive is above 90%, while that of coal-based carbon additive is basically around 70%. This is the reason why graphite carbon additives with a relatively low fixed carbon content can also be used.

4. The prices of carbon additives also vary: Graphite carbon additives are slightly more expensive than coal-based carbon additives, but the overall usage cost is much lower.

5. Different shapes: Graphite carbon additive is a lustrous cylinder, while coal-based carbon additive is in block granular form.

6. Graphite carbon additive has a relatively low melting point for steel, a high steelmaking temperature, and severe combustion, but its absorption coefficient is not high. The melting point of coal-based carbon additive is high. Although the absorption coefficient is low, it will not burn. It is no worse than graphite, but the price gap is huge. The number of steel mills is generally large. From the perspective of cost, this is unacceptable.

7. Graphite carbon additive is suitable for ductile iron with strict sulfur requirements, high carbon fixation content and good absorption coefficient, especially for medium-frequency furnaces ranging from half a ton to 12 tons.

8. The products produced with coal-based carbon additive are not only inferior to those made with graphite carbon additive, but also have a higher sulfur content, which reduces their output.