Magnesia refractories
Periclase-spinel brick
Magnesia refractory brick for rotary cement and lime kilns. Chrome-free and highly resistant to thermal shock.
- Type
- Shaped refractory, brick
- Base
- Magnesite (periclase) and spinel
- Chrome
- None
- Application
- Rotary cement and lime kilns
- Shape
- Straight, wedge, to drawing
- Standard
- Manufacturer's specification
Description
Periclase-spinel brick is a magnesia refractory based on sintered or fused periclase (MgO) with added magnesium aluminate spinel (MgO·Al₂O₃). No chromite is added to the mix, so no hexavalent chromium forms in the cement kiln to pass into the clinker and cement.
Spinel expands less than periclase when heated. A network of microcracks forms in the brick and absorbs stresses during sharp temperature changes. As a result, the brick handles coating loss and build-up, kiln shutdowns and start-ups better than ordinary periclase brick.
The main application is the burning zone and transition zones of rotary kilns in the cement industry, and the high-temperature zones of lime and dolomite kilns. The brick works in contact with clinker melt, alkalis and sulphates.
We supply straight brick, end and side wedges for the kiln diameter, and products to the customer’s drawing. The brick is laid with magnesia mortar or dry, according to the lining design. Store the brick on pallets in a dry, covered area: moisture causes periclase hydration and cracking.
Technical data
| Property | Typical values |
|---|---|
| MgO content, % | 84–87 |
| Al₂O₃ content, % | 10–12 |
| Cr₂O₃ content, % | none added |
| Bulk density, g/cm³ | 2.94–3.05 |
| Apparent porosity, % | 14–17 |
| Cold crushing strength, MPa | 55–70 |
| Refractoriness under load, °C | 1560–1700 |
| Thermal shock resistance (1300 °C — water), cycles | 17–30 |
Applications
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