Products
Products
01 · Shaped Refractories for Rotary Kilns
JX Special Corundum Composite Brick
- Code
- JXTGF
- Grades
- JXTGF-A · JXTGF-B
Hot or cold, it holds its shape.
- 130
- Thermal shock resistance (1100℃ water quench) cycles ≥
- 1700
- Refractoriness under load T0.6 ℃ ≥
- -0.339
- High-temperature creep % (1450℃×50h)
- 130
- Cold crushing strength MPa ≥
JX special corundum composite brick JXTGF-A
JX special corundum composite brick JXTGF-A
JX special corundum composite brick JXTGF-A
JX special corundum composite brick JXTGF-A
The JX special corundum composite brick is a high-quality patented product developed by our company specifically for the burning zone of rotary kilns for lime, metallic magnesium and bauxite calcination, and for the high-temperature zone and upper/lower transition zones of large dry-process cement kilns. It is made mainly from high-purity corundum by high-pressure forming and high-temperature firing. Its thermal shock resistance and high-temperature strength are particularly good, its flexibility and wear resistance particularly strong, and its thermal conductivity low. It effectively overcomes the drawbacks of basic products (magnesia-iron spinel, magnesia-alumina spinel) — high shell temperature, brick-end bursting and spalling at kiln stops and starts, and short service life — and also the drawbacks of silica-mullite bricks in the transition zone, grate cooler, wind-break wall and low wall of large dry-process cement kilns, where they oxidise easily, leading to end bursting and cracking and a short service period.
The product has been tested many times by the National Refractories Quality Supervision and Inspection Centre (Luoyang) and the testing centre of the Metallurgical Industry Engineering Quality Supervision Station (Beijing); its quality is stable and reliable.
Physical and chemical properties
| Property | JX special corundum composite brick JXTGF-A | JX special corundum composite brick JXTGF-B |
|---|---|---|
| Al₂O₃ % ≥ | 82 | 80 |
| Fe₂O₃ % ≤ | 1.0 | 1.2 |
| SiO₂ % ≤ | 7.8 | 7.85 |
| Apparent porosity % ≤ | 15.5 | 15.5 |
| Bulk density g/cm³ ≥ | 3.15 | 3.10 |
| Cold crushing strength MPa ≥ | 130 | 120 |
| Refractoriness under load T0.6 ℃ ≥ | 1700 | 1700 |
| Thermal shock resistance (1100℃ water quench) cycles ≥ | 130 | 110 |
| Permanent linear change on reheating (1450℃×3h, carbon-embedded) % | +0.1 | +0.1 |
| Crushing strength after alkali attack MPa ≥ | 86 | 86 |
| High-temperature creep % (1450℃×50h) | -0.339 | -0.339 |
| Reheat linear change (1450℃×3h) | 0-0.0012 | 0-0.0012 |
| Abrasion loss (cm³) ≤ | 3.0 | 3.0 |
| Property | JX special corundum composite brick JXTGF-A | JX special corundum composite hanging assembly JXSN-A006 | Silica-mullite red brick JXGM-H | Magnesia-iron composite spinel brick JXMF-85A | Magnesia-alumina composite spinel brick JXMA-86A |
|---|---|---|---|---|---|
| Apparent porosity % ≤ | 15.5 | 15.5 | 17 | 17 | 17 |
| Bulk density g/cm³ ≥ | 3.15 | 3.15 | 2.7 | 2.95 | 2.95 |
| Cold crushing strength MPa ≥ | 130 | 130 | 90 | 60 | 65 |
| Refractoriness under load T0.6 ℃ ≥ | 1700 | 1700 | 1680 | 1700 | 1700 |
| Thermal shock resistance (1100℃ water quench) cycles ≥ | 130 | 130 | 15 | ||
| Thermal shock resistance (950℃ air quench) cycles ≥ | 13000 | 13000 | 1500 | 100 | 100 |
| Reheat linear change (1450℃×3h) | 0.0012 | 0.0012 | |||
| High-temperature creep % (1450℃×50h) | -0.339 | -0.339 | |||
| Crushing strength after alkali attack MPa ≥ | 86 | 86 | |||
| Thermal expansion (1400℃) ≥ | 0.1 | 0.1 | 1.1 | 1.6 | 1.4 |
| Abrasion loss (cm³) ≤ | 3.0 | 3.0 | 7.8 | 7.8 | 7.8 |
These data are average results of production samples; typical values must not be regarded as maximum or minimum values.
Where product data differ from the goods actually supplied, the specifications in the supply contract or the actual test data of the batch prevail.
Recommended position in cement rotary kilns
Per the recommended optimised configuration
- Lower transition zoneJX special corundum composite brick —target service life ≥24 months
- Burning zoneJX magnesia-iron composite spinel brick andspecial corundum composite brick laidin combination.target service life ≥24 months
- Upper transition zoneJX special corundum composite brick +lightweight corundum-mullite compositebrick, rotary-laidtarget service life ≥24 months
- Preheating / calcining zoneSpecial corundum composite brick + lightweightcorundum-mullite brick, spiral-laidtarget service life ≥60 months60-month warranty
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