---
title: "High-alumina refractory"
description: "High-alumina refractory bricks contain 60–95% Al₂O₃ and serve in the highest-temperature zones of cement rotary kilns, lime kilns and metallurgical furnaces. The high alumina content provides superior resistance to slag attack and basic-chemistry erosion compared with conventional silica-alumina refractories."
canonical_url: "https://sylio.co/glossary/high-alumina-refractory"
last_updated: "2026-06-28T02:29:35.214Z"
---

**High-alumina refractory** bricks contain 60–95% Al₂O₃ and serve in the highest-temperature zones of [cement rotary kilns](/glossary/rotary-kiln), [lime kilns](/glossary/lime-kiln) and metallurgical furnaces. The high alumina content provides superior resistance to slag attack and basic-chemistry erosion compared with conventional silica-alumina refractories.

## Where it serves

- Cement kiln burning zone — direct contact with [clinker](/glossary/clinker) and combustion gas at 1,450 °C+
- [Calciner](/glossary/calciner) — high-temperature, AFR-driven aggressive chemistry
- [BOF](/glossary/basic-oxygen-furnace) and [EAF](/glossary/electric-arc-furnace) linings
- High-temperature [waste-heat boilers](/glossary/waste-heat-boiler) in metallurgical service

## Related terms

- [Refractory (castable / brick)](/glossary/refractory-castable-brick)
- [Rotary kiln](/glossary/rotary-kiln)
- [Calciner](/glossary/calciner)