Product Introduction
1. Raw Material Sources
The primary raw material for coal-based carburizer is high-quality anthracite coal, mainly sourced from:
China: Ningxia (low-sulfur, low-ash anthracite)
Material Requirements:
Fixed Carbon ≥ 80% (premium grades can exceed 90%)
Low Sulfur (S ≤ 0.5%), Low Ash (Ash ≤ 8%)
Low Volatile Matter (V ≤ 5%) for high-temperature stability
Manufacturing Process
The production of coal-based carburizer involves the following steps:
Raw Material Screening:
High-carbon, low-sulfur anthracite is selected and impurities are removed.
01
High-Temperature Calcination:
Calcined at 1200-1500°C to remove volatile matter and increase fixed carbon content.
Methods: Vertical kiln or rotary kiln (ensures uniform heating).
02
Crushing & Sizing:
Calcined coal is crushed and sieved into different particle sizes (common range: 1-10mm).
03
Special Treatments (Optional):
Graphitization (for premium products): Enhances carbon crystallinity for better carburizing effects.
Passivation: Reduces oxidation risks during storage and transportation.
04
Process Features:
Cost-effective, suitable for large-scale production.
Slightly higher sulfur content compared to petroleum coke-based carburizers (requires dosage control).
05
Product Specifications
(1) Typical Parameters
|
Parameter |
Standard Coal-Based Carburizer |
Premium Coal-Based Carburizer |
|
Fixed Carbon (%) |
≥ 85% |
≥ 92% |
|
Sulfur (%) |
≤ 0.5% |
≤ 0.3% |
|
Ash (%) |
≤ 8% |
≤ 5% |
|
Volatile Matter (%) |
≤ 5% |
≤ 3% |
|
Particle Size (mm) |
1-10 (customizable) |
0.5-5 (precision sieved) |
(2) Product Forms
Granular (1-10mm): General-purpose, suitable for electric furnaces and cupolas.
Powder (≤1mm): Used in precision casting or ladle carburization.
Key Advantages
Cost-Effective:
30%-50% cheaper than graphite carburizers.
Stable Carburization:
High fixed carbon content with absorption rates of 80%-90%.
Wide Applicability:
Suitable for cast iron, cast steel, and alloy smelting.
Applications
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Foundry Industry:
Gray iron and ductile iron melting (carbon supplementation, partial replacement of pig iron).
Steelmaking:
Used in medium-frequency furnaces and electric arc furnaces with scrap steel.
Ferroalloy Production:
Carbon adjustment in ferrosilicon, ferrochrome, etc
Usage Notes
Sulfur Control:
High-sulfur coal-based carburizers require desulfurization measures.
Particle Size Matching:
Large furnaces use coarse particles (5-10mm), small furnaces use fine particles (1-5mm).
Moisture Protection:
Store in dry conditions to prevent absorption and efficiency loss.
Coal-based carburizers are widely used in foundry and metallurgical industries due to their low cost and high carbon content, particularly in general cast iron production where sulfur tolerance is moderate.