Article Navigation
- Product Classification
- Technical Specifications
- Industrial Applications
- Usage Guidelines
- Transport & Storage
- Procurement Best Practices
- Why Choose Kerui High Alumina Cement?
1. Product Classification
High alumina cement (HAC), also known as calcium aluminate cement (CAC), is categorized based on its Al₂O₃ content and chemical composition:
| Type | Al₂O₃ Content | Key Characteristics |
|---|---|---|
| Standard HAC | 35–45% | Balanced strength and rapid hardening |
| High-Purity HAC | 50–65% | Enhanced refractory properties (1,600°C+) |
| Low-Calcium HAC | 68–80% | Superior chemical resistance, low porosity |
Specialized variants include zirconia-enhanced HAC for extreme thermal shock resistance and sulfate-resistant HAC for corrosive environments.
2. Technical Specifications
Kerui’s high alumina cement complies with GB175-2007 and international standards, offering:
| Parameter | Standard CA50 | High-Purity CA70 | Special CA80 | Test Method |
|---|---|---|---|---|
| Al₂O₃ Content | 50% | 70% | 80% | XRF Analysis |
| Cold Crushing Strength | ≥50 MPa | ≥70 MPa | ≥100 MPa | ASTM C133 |
| Refractoriness | 1,100°C | 1,200–1,300°C | 1,300–1,600°C | ASTM C113 |
| Setting Time | 2–4 hours | 1–3 hours | 1–3 hours | ASTM C191 |
| Thermal Conductivity | 1.2–1.5 W/m·K | 0.8–1.2 W/m·K | 0.6–1.0 W/m·K | ASTM C201 |
Kerui’s KR-CA80 Low-Calcium HAC achieves Al₂O₃ >80% with α-Al₂O₃ crystallization for ultra-high stability.
3. Industrial Applications
3.1 Construction
- Rapid-Repair Concrete: Quick-setting properties (1–3 hours) for emergency structural repairs.
- Sulfate-Resistant Foundations: Ideal for marine environments and chemical plants.
3.2 Metallurgy
- Ladle Linings: Withstand molten metal temperatures up to 1,600°C.
- Tundish Nozzles: Low thermal expansion minimizes cracking.
3.3 Refractories
- Castables & Mortars: Binder for high-alumina bricks (Al₂O₃ 48–90%) in cement kilns.
- Insulation Coatings: Combined with ceramic fibers for boilers and furnaces.
4. Usage Guidelines
4.1 Mixing Ratios
- Refractory Castables: 10–15% HAC + 60–70% aggregates (bauxite, corundum) + 5% additives.
- Mortars: 25–30% HAC + 70–75% fine alumina powder.
4.2 Curing Protocol
- Hydration: Maintain 15–25°C for 24 hours.
- Drying: Gradually heat to 350°C at 20°C/hour.
5. Transport & Storage
- Packaging: 50 kg waterproof bags (palletized for bulk orders).
- Storage: <30°C, <60% humidity, away from incompatible materials (e.g., Portland cement).
- Shelf Life: 6 months in unopened bags; use within 3 months after opening.
6. Procurement Best Practices
- Certifications: Verify ISO 9001, GB175-2007, or ASTM C401 compliance.
- Sample Testing: Request lab reports for Al₂O₃ content, strength, and thermal stability.
- Supplier Audit: Prioritize manufacturers with in-house R&D (e.g., Kerui’s 36-member technical team).
- MOQ Flexibility: Kerui supports trial orders from 1 ton to full-container loads.
7. Why Choose Kerui High Alumina Cement?
- Innovation: 12+ patents, including KR-HAC80 with 80% Al₂O₃ for aerospace-grade refractories.
- Customization: Tailored formulations for sulfate resistance, rapid curing, or low thermal conductivity.
- Global Reach: Served 300+ projects across 30 countries, including LafargeHolcim and CNBM partnerships.
- Sustainability: ECO-series HAC with 30% recycled aggregates, reducing CO₂ emissions by 40%.
Kerui’s HAC is engineered for precision, backed by 24/7 technical support and a 15-year track record in refractory solutions.
Data sourced from Kerui R&D reports and industry standards. Performance may vary based on application conditions.
