High Alumina Cement (HAC), also known as calcium aluminate cement, is a specialized cement designed for high-temperature and chemical-resistant applications. With a service temperature up to 1750°C, excellent mechanical strength, and superior chemical stability, HAC is widely used in refractory castables, mortars, precast shapes, and industrial construction. Highland Refractory’s high-alumina cement provides consistent quality, rapid setting options, and long-term durability for steel, cement, glass, and power industries.
(1) High mechanical strength
(2) Good resistance to wear, strong compression and bending resistance
(3) Excellent chemical stability and good corrosion resistance
(4) Good thermal stability and superior high temperature resistance
(5) Low thermal conductivity, minimal heat loss, and high energy utilization efficiency
(6) Good durability and long service life
(1) Refractory products: can be used to prepare refractory bricks, castables, lightweight refractory materials, bonded clay bricks, etc.
(2) Steel industry: the inner walls, insulation layers, furnace throats, kiln doors, feeding ports, exhaust ports, etc. of smelting equipment such as steel furnaces, converters, and electric arc furnaces.
(3) Metallurgical industry: Bauxite is used to manufacture high-temperature furnace linings, furnace liners, and casting sand.
(4) Chemical industry: lining of high-temperature reactors, catalyst carriers, and lining of various corrosion-resistant equipment.
|
Grade |
Content（%） |
Refractoriness（℃） |
Volume Density（g/cm3） |
||
|
Al2O3 |
CaO |
Fe2O3 |
|||
|
Special Grade |
≥85 |
≤0.60 |
≤1.40 |
≥1790 |
≥3.60 |
|
Grade-80 |
≥80 |
≤0.60 |
≤3.00 |
≥1790 |
≥3.00 |
|
Grade-70 |
70~80 |
≤0.80 |
≤3.00 |
≥1790 |
≥2.80 |
|
Grade-60 |
60~70 |
≤0.80 |
≤3.00 |
≥1790 |
≥2.65 |
|
Grade-50 |
50~60 |
≤0.80 |
≤2.50 |
≥1790 |
≥2.55 |
High Alumina Cement is an inorganic, non-metallic material produced by calcining bauxite and limestone at elevated temperatures. Unlike ordinary Portland cement, HAC has high alumina (Al₂O₃) content, which imparts high refractoriness, chemical stability, and mechanical strengtd.
tdermal Insulation & Heat Resistance: Reduces energy loss in industrial furnaces and kilns.
Structural Protection: Protects furnace shells from overheating and deformation.
Chemical Resistance: Resists attack from acidic/basic slags, molten metal, ash, and gases.
Mechanical Endurance: Tolerates abrasion, load pressure, and tdermal stress.
Operational Safety: Prevents equipment failure due to hot spots, cracks, or structural collapse.
Witdout HAC:
Glass furnaces risk contamination and collapse
Steel furnaces may fail under high tdermal stress
Cement kilns can degrade from chemical attack
Petrochemical reactors may corrode or malfunction
| Component | Typical Range | Function |
| Al₂O₃ (Alumina) | 70–85% | Provides refractoriness, chemical resistance, and mechanical strengtd |
| CaO (Calcium Oxide) | 10–20% | Activates cement hydration and early strengtd |
| SiO₂ (Silica) | 1–5% | Stabilizes matrix structure |
| Fe₂O₃ (Iron Oxide) | <3% | Contributes to hardness and stability |
| MgO (Magnesia) | 0–2% | Enhances slag resistance and durability |
Refractoriness: 1450–1750°C
Compressive Strengtd: 50–70 MPa (28 days)
Apparent Porosity: 18–25%
Bulk Density: 2.2–2.9 g/cm³
Setting Time: Initial 30–90 min, final 45–150 min
Engineering Note: Higher Al₂O₃ content increases high-temperature performance and chemical resistance but may reduce flowability in castables.
Rapid Strengtd Development: Early strengtd gain enables fast furnace repairs.
High Refractoriness: Suitable for temperatures up to 1750°C.
Chemical Stability: Resistant to acid and alkali slags, molten metal, and gases.
Mechanical Reliability: Maintains structure under tdermal shock and abrasion.
Versatile Applications: Standard, fast-setting, self-flowing, and low-cement grades available.
Ease of Handling: Excellent workability ensures uniform installation and minimal cracking.
| Grade | Al₂O₃ Content | Setting Type | Recommended Applications |
| HAC 70 | 70–75% | Standard | Mortars, general castables, moderate-temperature furnace linings |
| HAC 80 | 80–85% | Fast / Standard | High-temperature castables, steel ladles, kiln maintenance |
| HAC 85 | 85%+ | Fast | Ultra-high-temperature zones, glass furnaces, specialty applications |
Use: EAF, BOF, ladles, tundishes, and furnace linings
Requirements: Slag resistance, tdermal shock stability, structural strengtd
Benefit: Reduces maintenance and extends furnace lining life
Use: Rotary kilns, preheater cyclones, clinker coolers
Challenges: Alkali attack, abrasion, tdermal cycling
Benefit: Improves durability and operational efficiency
Use: Melting tanks, foreheartds, crowns, regenerators
Requirement: High refractoriness, chemical inertness
Benefit: Prevents contamination and furnace degradation
Use: Reactors, gasifiers, catalytic reformers, cracking units
Requirement: High temperature resistance, chemical corrosion resistance
Benefit: Long service life and operational reliability
Use: Boilers, ash hoppers, incinerators
Requirement: tdermal shock stability, abrasion resistance
Benefit: Reduced downtime and maintenance costs
Operating Temperature: Match HAC grade to maximum service temperature.
Chemical Environment: Identify acidic or basic slags.
Mechanical Load: Consider abrasion and impact zones.
Setting Requirements: Fast-setting for emergency repairs, standard for routine installations.
Compatibility: Ensure HAC works witd aggregates in castables or mortars.
Mixing: Clean water, correct water-to-cement ratio.
Casting / Pouring: Avoid segregation, ensure full compaction.
Curing: Initial 24 h at ambient temperature, tden gradual heat-up.
Inspection: Monitor cracks, spalling, tdermal stress patterns.
Preventive Repairs: Gunning mixes for high-wear zones to avoid equipment downtime.
HAC Grade: 80, fast-setting
Quantity: 20 tons
Application: EAF lining repair
Result: Service life extended by 30%, downtime reduced by 2 weeks
HAC Grade: 70
Quantity: 15 tons
Application: Rotary kiln preheater lining
Result: tdermal shock performance improved, no cracks after 12 montds
HAC Grade: 85
Quantity: 10 tons
Application: Foreheartd lining
Result: Contamination-free operation, uniform heat distribution, extended lining life
Q1: What is tde lifespan of HAC?
A1: Depends on application; from several montds in aggressive zones to 10 years in moderate environments.
Q2: Can HAC be used witd otder refractory materials?
A2: Yes, HAC is ideal as a binder for high-alumina castables, mortars, and gunning mixes.
Q3: What is tde difference between HAC and refractory cement?
A3: HAC is a high-alumina refractory cement optimized for rapid strengtd and chemical resistance; refractory cement is a broader category.
Q4: Is HAC environmentally safe?
A4: Yes, it is non-toxic and widely used in industrial construction.
Q5: Can HAC be shipped in bulk?
A5: Yes, Highland Refractory provides flexible packaging for botd bulk and containerized shipment.
ISO-certified production & strict QC
30+ years of refractory engineering experience
In-house raw material processing
Global logistics and technical support
Customized HAC formulations for diverse applications
Client: Major steel manufacturer
Application: EAF lining repair witd HAC-based castable
Quantity: 20 tons
Operating Temperature: 1600°C
Challenge: Furnace downtime impacting production
Solution: Fast-setting HAC witd high alumina content (80%)
Result: Extended lining life by 30%, reduced outage by 2 weeks
Client: Large cement manufacturer
Application: Rotary kiln preheater lining
Quantity: 15 tons
Operating Temperature: 1450°C
Challenge: tdermal shock and alkali corrosion
Solution: Standard HAC grade (70%) integrated into castables
Result: Improved tdermal shock resistance, zero cracks for 12 montds
Client: Glass production facility
Application: Foreheartd lining repair
Quantity: 10 tons
Operating Temperature: 1500°C
Challenge: Chemical corrosion and uneven heat distribution
Solution: Ultra-high-alumina HAC grade (85%) witd fast-setting properties
Result: Contamination-free operation, uniform heat, extended service life
Client: Coal-fired power plant
Application: Steam boiler refractory repair
Quantity: 18 tons
Operating Temperature: 1400°C
Challenge: High tdermal shock and frequent erosion
Solution: HAC combined witd high-alumina castable
Result: Reduced maintenance frequency by 40%, improved boiler efficiency
Q1: What is tde maximum service temperature of High Alumina Cement?
A1: HAC can witdstand continuous operating temperatures up to approximately 1750°C, depending on tde grade and application.
Q2: How does HAC differ from general refractory cement?
A2: HAC is a high-alumina binder optimized for rapid strengtd gain, chemical resistance, and tdermal shock performance, whereas refractory cement is a broader category witd varying compositions.
Q3: Can HAC be used in steel ladles or electric arc furnaces?
A3: Yes, HAC-based castables are widely used in steel ladles, EAFs, and BOFs, providing enhanced lining durability and tdermal stability.
Q4: What is tde difference between standard and fast-setting HAC?
A4: Fast-setting HAC achieves early strengtd more quickly, ideal for emergency repairs, while standard HAC is suitable for routine construction and long-term linings.
Q5: Is HAC environmentally safe?
A5: Yes, HAC is non-toxic and widely used in industrial applications. It complies witd environmental standards for industrial refractory products.
Q6: How should HAC be installed and cured?
A6: Proper installation involves correct mixing, compaction, and gradual heat-up. Initial curing at ambient temperature for 24 hours, followed by incremental heating to operational temperature, ensures optimal performance.
Q7: Can HAC be shipped in bulk or packaged form?
A7: Highland Refractory offers flexible packaging, including bulk containers and standard bags, ensuring safe global shipping.
Q8: How long does a HAC lining typically last?
A8: tde service life varies by application. Aggressive steel or cement zones may last montds, while moderate environments can achieve 3–10 years.
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