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High Alumina Arc Brick – Premium Curved Refractory for Circular Furnace Lining
1. Product Overview
High Alumina Arc Brick, also named universal curved refractory brick, is a neutral aluminosilicate refractory product with Al₂O₃ content ranging from 48% to 85%. Manufactured from high-purity bauxite chamotte via precise mould pressing and high-temperature sintering, this specially curved brick is tailor-made for circular kilns, ladles, arched furnace tops and curved lining sections that standard straight bricks cannot fit perfectly.
Unlike regular rectangular high alumina bricks, its dual curved design allows flexible adjustment during masonry. Even with minor dimensional tolerances, the bricks can be assembled into complete circular linings without obvious gaps, solving the core construction difficulty of round high-temperature vessels in metallurgy, cement and glass industries.
We classify our high alumina arc bricks into multiple grades by alumina content: LZ-48, LZ-55, LZ-65, LZ-75 and LZ-80, matching different working temperature and anti-slag requirements of industrial clients. Custom radii, thickness and overall dimensions are available according to furnace drawings.
2. Core Material & Production Technology
Raw materials are selected high-grade bauxite clinker, matched with low-impurity binding clay, strictly proportioned by automatic batching systems. The whole production flow includes raw material crushing, fine grinding, ageing, high-pressure forming, drying and tunnel kiln firing above 1350℃. Strict quality inspection is implemented for every batch to control apparent porosity, bulk density and refractoriness, avoiding loose texture or unstable high-temperature performance.
The main mineral phases of finished bricks are mullite and corundum. Higher alumina grades contain more corundum crystals, bringing stronger high-temperature strength and corrosion resistance, suitable for harsh smelting environments with severe slag erosion.
3. Key Performance Advantages
Thermal Performance
- Ultra-high refractoriness above 1770℃; high load softening temperature over 1500℃, no deformation under long-term high-temperature pressure
- Excellent thermal shock stability, low thermal expansion coefficient, resistant to rapid heating-cooling cycles without cracking or spalling
- Low thermal conductivity, effectively reduce furnace heat loss and cut fuel consumption for production lines
Structural & Construction Merits
- Optimized curved geometry for circular lining masonry; adjustable roundness during installation to match ladle and kiln inner diameters
- Ultra-narrow brick joints controlled within 1mm after laying, greatly improving lining tightness and preventing molten slag penetration
- Reduce vertical straight joints by over 70% compared with standard bricks, enhancing overall lining structural stability and extending service life
- High bulk density and compressive strength, wear-resistant against molten metal scouring and mechanical impact
Chemical Resistance
As neutral refractory material, it delivers balanced anti-corrosion capacity against both acid and alkaline slags. It maintains stable chemical structure when exposed to molten iron, cement clinker and glass liquid, effectively slowing down lining erosion in continuous high-temperature production.
4. Main Industrial Application Scenarios
Steel & Metallurgy Industry
The most widely used field for high alumina arc bricks, serving as permanent lining for steel ladles, refining ladles and tundishes. Also applicable to electric arc furnace roofs, induction furnace curved sections and small blast furnace circular linings, resisting erosion of high-temperature molten steel and metallurgical slag.
Cement Manufacturing Industry
Lining material for rotary kiln transition zones, preheater cyclone curved walls and cooling machine arch sections. Stable performance under long-term calcination of cement clinker, resisting alkaline ash corrosion and frequent temperature fluctuation.
Glass Industry
Regenerator curved partition walls, melting furnace arch linings and feeding channel circular sections. No contamination to glass liquid at high temperature, stable against volatile alkali gas erosion inside glass furnaces.
Non-Ferrous Metal Smelting
Aluminum, copper and lead smelting furnaces, refining pots and circular holding furnaces, adapting to medium-high temperature non-ferrous smelting environments.
Chemical & Environmental Protection
High-temperature reaction kettles, waste incinerator circular linings and petrochemical cracking furnaces, resisting erosion from acid-base flue gas and molten ash.
5. Technical Parameter Reference (Main Grades)
- LZ-48 Arc Brick: Al₂O₃ ≥48%, Refractoriness ≥1750℃, Apparent Porosity ≤28%, Compressive Strength ≥40MPa
- LZ-65 Arc Brick: Al₂O₃ ≥65%, Refractoriness ≥1770℃, Apparent Porosity ≤25%, Compressive Strength ≥55MPa
- LZ-75 Arc Brick: Al₂O₃ ≥75%, Refractoriness ≥1790℃, Apparent Porosity ≤23%, Compressive Strength ≥65MPa
- LZ-80 Arc Brick: Al₂O₃ ≥80%, Refractoriness ≥1800℃, Apparent Porosity ≤21%, Compressive Strength ≥70MPa
All grades support customized curved radii and sizes; technical data sheets can be provided upon client request.
6. Selection & Service Tips
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Grade Selection Guide
For low-temperature kilns below 1400℃ with weak slag erosion: choose LZ-48 / LZ-55 arc bricks for cost efficiency.
For medium-temperature cement kilns and general steel ladles: LZ-65 is the mainstream cost-effective option.
For heavy-duty continuous casting ladles, high-load smelting furnaces: select LZ-75 or LZ-80 high-alumina grades for longer service cycle.
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Customization Support
Our factory accepts non-standard curved size customization based on client furnace design drawings, including special arch bricks for small-diameter ladles and large rotary kiln circular lining bricks. We can provide masonry layout suggestions to lower on-site construction difficulty.
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Packaging & Delivery
Standard export packaging with waterproof plastic film and fumigated wooden pallets to avoid breakage during long-distance sea or land transportation. Flexible MOQ supports trial orders and mass bulk supply, with stable monthly production capacity to guarantee on-time delivery.
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After-Sales Technical Support
Our refractory engineer team offers one-stop service including material selection consultation, lining construction guidance and post-installation performance tracking, helping clients reduce furnace maintenance frequency and lower overall refractory cost.
7. Conclusion
High Alumina Arc Brick solves the long-standing pain point of difficult circular furnace lining construction with its exclusive curved shape and comprehensive high-temperature resistance. Balancing outstanding thermal stability, anti-slag performance and convenient masonry, it has become an indispensable lining refractory for circular industrial kilns across metallurgy, cement, glass and chemical sectors. Whether for new furnace building or old lining renovation, customized high alumina arc bricks deliver reliable long-term operation and clear economic benefits for high-temperature production lines.
If you have inquiries about size customization, technical parameters or bulk quotation, feel free to send your furnace working conditions and drawing requirements for professional solution matching.
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