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Why Choose Graphite Recarburizer Carbon Additives
The main raw material for the manufacture of artificial graphite is powdered high-quality calcined petroleum coke, in which pitch is added as a binder, and a small amount of other auxiliary materials are added. After high temperature treatment, the content of ash, sulfur and gas are greatly reduced.
When smelting nodular cast iron, in order to make the metallurgical quality of cast iron superior, artificial graphite should be the first choice for recarburizer
Petroleum coke is a carburant widely used at present. Petroleum coke is a by-product of refining crude oil. The residual oil and petroleum pitch obtained from crude oil distillation under atmospheric pressure or vacuum distillation can be used as raw materials for making petroleum coke, and then raw petroleum coke can be obtained after coking.
Raw petroleum coke is available in sponge, needle, granular and fluid forms.
Calcination of petroleum coke is to remove sulfur, moisture, and volatile matter. Calcining raw petroleum coke at 1200-1350°C can make it into substantially pure carbon.
There are two kinds of natural graphite, flake graphite and microcrystalline graphite.
Microcrystalline graphite has a high ash content and is generally not used as a recarburizer for cast iron.
There are many varieties of flake graphite: high-carbon flake graphite needs to be extracted by chemical methods, or heated to high temperature to decompose and volatilize the oxides in it. This kind of flake graphite has a small output and high price, and is generally not used as a carburant; The ash content in graphite is high, so it is not suitable to be used as a recarburizer; medium-carbon graphite is mainly used as a recarburizer, but the amount is not much.
Coke and Anthracite, In the process of electric arc furnace steelmaking, coke or anthracite can be added as a carburant when charging. Induction furnace smelting cast iron is rarely used as a recarburizer due to its high ash and volatile content.
Chemical Composition of Carbon Additives
| Carbon Additives | C （%） | Ash （%） | Moisture （%） | Volatile Matter （%） | S （%） | N （%） | H （%） | Bulk Density （g/cm3） |
| Artificial Graphie | 99.2 | 0.4 | 0.20 | 0.10 | 0.05 | 0.005 | ― | 0.84 |
| Flake Graphite | 85.3 | 13.2 | 0.06 | 0.44 | 0.35 | 0.060 | ― | ― |
| Calcined Petroleum Coke (Medium S) | 96.5 | 0.4 | 0.40 | 0.30 | 1.50 | 0.600 | 0.15 | 0.77 |
| Calcined Petroleum Coke (Low S) | 98.3 | 0.4 | 0.10 | 0.20 | 0.30 | 0.080 | 0.04 | 0.800 |
| Dry Coke | 87.7 | 9.0 | 0.30 | 1.00 | 1.00 | 1.000 | — | 0.64 |
| Anthracite | 90.0 | 2.5 | 2.00 | 3.5 | 0.25 | 0.600 | 1.10 | 0.64 |
| Pitch Coke | 97.0 | 0.5 | 0.50 | 0.5 | 0.4 | 0.700 | 0.20 | 0.55 |
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JBT produces and supplies silicon metal and ferrosilicon products, mainly products are silicon metal 553, 441, 421, 411 3303,2202, 97, silicon carbide, carbon raiser for steelmaking and casting industries. We also make electrolytic manganese metal, inoculants and nodulizers.
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