Calcined anthracite coal CAC is a kind of carburizing material made by treating high-quality anthracite at high temperature. The calcination process increases the carbon content and purity of anthracite, while improving its physical and chemical properties, making it widely used in casting, steelmaking, carbon material production and other fields. Compared with ordinary anthracite and other carburizing agents, calcined anthracite coal CAC has the following advantages:
1. High fixed carbon content
The fixed carbon content of calcined anthracite coal CAC is usually 85%-92%, which is significantly higher than that of ordinary anthracite without calcination. This high carbon content allows it to provide an efficient carbon source in the smelting process, meeting the demand for carburizing metal materials.
2. Low volatile content
The volatile content of calcined anthracite coal CAC is greatly reduced, usually less than 5%. This means that less soot and volatile organic compounds are produced during the high-temperature smelting process, which helps to reduce environmental pollution and reduce corrosion and wear on equipment.
3. Low sulfur and low ash
The calcination process can effectively reduce the sulfur and ash content of anthracite, and the sulfur content of calcined anthracite coal CAC is usually less than 0.3% and the ash content is less than 8%. Low sulfur helps prevent the formation of sulfide inclusions in metal materials, thereby improving metal properties, while low ash helps reduce impurities in residues and metals.
4. Good absorption rate
The absorption rate of calcined anthracite coal CAC can usually reach 85%-90%, which is significantly better than that of ordinary anthracite. Although its absorption rate is slightly lower than that of petroleum coke carburants, calcining anthracite is a cost-effective option in the case of limited budget.
5. Good electrical and thermal conductivity
The calcination process makes the crystal structure of anthracite more stable and has certain electrical and thermal conductivity. This characteristic makes calcined anthracite coal CAC not only a carburizer, but also can be used to manufacture carbon products such as electrodes and carbon blocks.
6. High temperature resistance
Calcined anthracite coal CAC has stable chemical properties in high temperature environment, and is not easy to decompose or have adverse reactions, and its high temperature resistance is suitable for the high temperature operation needs of metallurgical industry. This characteristic reduces the carbon loss in the smelting process and improves the smelting efficiency.
7. Abundant resources and low prices
Anthracite has abundant reserves, and the price of calcined products is much lower than that of graphite and petroleum coke carburants. Therefore, calcined anthracite coal CAC is a cost-effective option, especially suitable for small and medium-sized casting and steelmaking enterprises.
8. Strong processability and adaptability
Calcined anthracite coal CAC can be processed into different particle sizes (such as powder or granular) to adapt to different smelting processes and equipment needs. At the same time, its physical properties are stable and can be used in a variety of melting processes, including electric arc furnace, induction furnace and cupola furnace.
9. Better environmental performance
The calcination process removes a large number of harmful substances, which makes the calcined anthracite coal CAC less smoke and cleaner emissions when used, and has less negative impact on the environment. In addition, the residue after combustion is less, which reduces the difficulty of waste disposal.
10. Improve casting and metal quality
The carbon in calcined anthracite coal CAC can be dissolved into hot metal or molten steel in a stable manner, which helps to improve the graphitization form of castings, improve the density and mechanical properties of castings, and reduce defects.
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Calcined anthracite coal CAC has become a widely used carburizing material due to its advantages of high carbon content, low sulfur and ash, high temperature resistance and low price. It is particularly suitable for metallurgy and casting processes with high carbon content requirements but limited budgets. Although its performance is slightly inferior to that of petroleum coke and graphite carburizer, it provides a good balance between cost and performance, and is an indispensable important material in the low-end market.
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