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Calcined Anthracite Coal Specifications
Calcined Anthracite Coal Specifications
Calcined anthracite coal is produced by heating high‑grade anthracite to temperatures between 1200 °C and 1400 °C in a controlled atmosphere. This process drives off volatile matter, increases fixed carbon content, and develops a highly ordered carbon structure suitable for demanding industrial applications.
Chemical Composition
Typical analysis shows fixed carbon exceeding 90 % on a dry basis, ash content below 8 %, and sulfur levels under 0.5 %. Moisture after calcination is generally less than 0.5 % because the drive‑off temperature removes residual water.
The low volatile matter (usually under 2 %) ensures minimal gas evolution during downstream processes such as electrode manufacturing or carbon additive blending.
Physical Properties
Key physical characteristics are summarized in the table below. Values represent typical ranges observed across multiple production lots; actual figures can be adjusted according to project requirements.
| Property | Typical Range | Test Method |
|---|---|---|
| Fixed Carbon (wt %) | 90 – 95 | ASTM D3175 |
| Ash (wt %) | 5 – 8 | ASTM D3174 |
| Sulfur (wt %) | 0.3 – 0.5 | ASTM D4239 |
| Moisture (wt %) | <0.5 | ASTM D3302 |
| Volatile Matter (wt %) | <2 | ASTM D3175 |
| Specific Gravity | 1.4 – 1.6 | ASTM D291 |
Industrial Applications
The high carbon purity and low impurity levels make calcined anthracite suitable as a recarburizer in steelmaking, where it adjusts melt carbon content without introducing detrimental elements.
In the production of carbon electrodes for aluminum smelting, the material provides a stable conductive matrix with minimal gas evolution during baking.
It also serves as a filler in refractory bricks and monoliths, contributing to thermal conductivity and resistance to slag penetration.
- Steelmaking recarburizer – improves carbon yield, reduces alloying costs.
- Anode paste for aluminum electrolytic cells – ensures consistent electrical resistivity.
- Refractory additive – enhances thermal shock resistance.
- Carbon brushes and electrodes – provides low wear and high conductivity.
Quality Control and Testing
Each batch undergoes systematic sampling according to ISO 9001‑aligned procedures. Samples are analyzed for fixed carbon, ash, sulfur, and moisture using accredited laboratory methods.
Particle size distribution is monitored via laser diffraction to ensure compliance with customer‑specified grading, which influences reactivity and bulk density in downstream processes.
Thermal stability is assessed by thermogravimetric analysis (TGA) to confirm that no significant mass loss occurs below the intended application temperature.
Packaging and Storage
Product is typically packed in 25 kg multi‑wall paper bags with an inner polyethylene liner, or in 1 metric ton bulk bags (FIBC) equipped with lift loops and discharge spouts.
Storage conditions recommend a dry, covered environment with temperature below 40 °C to prevent moisture re‑adsorption. Proper ventilation reduces the risk of dust accumulation.
Frequently Asked Questions
Can the particle size be customized?
Yes, the calcined anthracite can be crushed and screened to specific size ranges (e.g., 0‑5 mm, 5‑10 mm) based on the requirements of the carbon paste or refractory mix.
What information is needed for a quotation?
To prepare an accurate quote we require the desired quantity, packaging preference, target specifications (fixed carbon, ash, sulfur limits), and delivery destination.
How is product quality verified before shipment?
A pre‑shipment inspection report includes chemical analysis, moisture content, and particle size distribution, performed by an independent laboratory upon request.
Contact for Technical Inquiry
For detailed specifications, sample requests, or to discuss how calcined anthracite coal can meet your process needs, please reach out to our technical team.
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