Chromium corundum brick
Chromic corundum bricks are primarily composed of an α-Al₂O₃-Cr₂O₃ solid solution as the main mineral phase. The secondary mineral phases include small amounts of complex spinel (or no complex spinel at all). These refractory bricks have a chromium oxide content ranging from 1% to 30%.
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Product Introduction
Chromic corundum bricks are primarily composed of an α-Al₂O₃-Cr₂O₃ solid solution as their main mineral phase. The secondary mineral phases include small amounts of complex spinel (or no complex spinel at all). These refractory bricks contain 1% to 30% chromium oxide. There are two types: cast chromic corundum bricks and sintered chromic corundum bricks. In general, when the term "chromic corundum brick" is used without further specification, it refers to sintered chromic corundum bricks.
Chromic corundum bricks are made from α-Al₂O₃ as the raw material, with an appropriate amount of chromic oxide powder and fine powder of sintered chromic corundum added. The mixture is then formed into shape and fired at high temperature. Sintered chromic corundum bricks generally have a lower chromium oxide content than fused chromic corundum bricks. They can also be produced by the slip-casting method: α-Al₂O₃ powder and chromic oxide powder are uniformly mixed, along with a deflocculant and an organic binder, to form a thick slurry. A portion of sintered chromic corundum is added to this slurry, which is then cast into brick blanks using the slip-casting technique and subsequently fired. These bricks can be used as linings for glass furnaces, cover plates for molten-glass flow channels in wire-drawing processes, and as backings for iron pre-treatment units, waste incinerators, and pressurized coal-water slurry gasifiers.
Product Applications
Currently, chromite corundum bricks are finding increasingly broad applications. One type of such brick is made primarily from metallic chromium slag. These bricks are widely used in zinc smelting electric furnaces and volatilization kilns. Chromite corundum bricks exhibit excellent thermal shock resistance and high-temperature creep performance, while also meeting the requirements of the national circular economy.
Another type of refractory brick called aluminum-chrome spinel is widely used in copper smelting, effectively breaking the monopoly held by magnesia-chrome bricks.
Chromic corundum bricks, widely used in zinc smelting electric furnaces and volatilization kilns, exhibit excellent thermal shock stability and high-temperature creep resistance, while also meeting the requirements of the national circular economy.
Product Parameters
Zirconium Corundum Series
| Project\Name | Unit | Zircon sand | Zirconium corundum | Zirconium-aluminum | Zircon-based ramming mass |
| ZrO₃ | % | 57-61 | 33-42 | ≥18 | ≤60 |
| Apparent porosity | % | ≤22 | ≤22 | ≤23 | One |
| Load softening temperature | Celsius | ≥1600 | ≥1600 | ≥1550 | One |
| Room-temperature compressive strength | Mpa | 80-85 | 80-85 | ≥75 | One |
| Refractoriness | Celsius | ≥1790 | ≥1790 | ≥1770 | One |
| Volumetric density | g/cm³ | ≥3.4 | 3.0–3.4 | ≥2.9 | One |
Zirconium brick
| Project | Dense zircon brick | Ordinary zircon brick | Zircon-corundum brick | Zirconia-mullite brick | Half-zirconia brick |
| ZrO₂% | ≥65 | ≥60 | ≥30 | ≥18 | ≥15-20 |
| Al₂O₃% | ≥50 | ≥55 | ≥50-60 | ||
| SiO₂% | ≤38 | ≤18 | ≥25 | ≤22 | |
| Fe₂O₃% | ≤0.3 | ≤0.5 | ≤0.5 | ≤0.5 | ≤1.0 |
| Apparent porosity % | ≤18 | ≤22 | ≤22 | ≤17 | ≤20 |
| Volumetric density g/cm³ | ≥3.7 | ≥3.5 | ≥3.2 | ≥2.7 | ≥2.7 |
| Room-temperature compressive strength, MPa | ≥100 | ≥100 | ≥100 | ≥100 | ≥100 |
| Softening start temperature ℃ (0.2 MPa, 0.6%) |
≥1650 | ≥1620 | ≥1650 | ≥1650 | ≥1550 |
| Application | Mainly used in critical parts of glass kilns, glass fiber furnaces, waste-to-energy incinerators, and electric heating furnaces. | ||||
| Project | Chromium corundum brick | ||||
| CRCB-5 | CRCB-12 | CRCB-20 | CRCB-30A | CRCB-30B | |
| Long-term operating temperature, ℃ | 1800 | 1850 | 1850 | 1850 | 1850 |
| Cr₂O₃ % ≥ | 5 | 12 | 19 | 24 | 30 |
| Al₂O₃ + Cr₂O₃ % ≥ | 93 | 93 | 93 | 93 | One |
| Al₂O₃ + Cr₂O₃ + ZrO₂ % ≥ | One | One | One | One | 93 |
| Fe₂O₃ % ≤ | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Bulk density ≥ g/cm³ | 3.15 | 3.20 | 3.20 | 3.30 | 3.35 |
| Apparent porosity % ≤ | 18 | 18 | 18 | 18 | 18 |
| Room-temperature compressive strength, MPa | 75 | 80 | 80 | 90 | 90 |
| Softening start temperature ℃ (0.2 MPa, 0.6%), ≥ | 1700 | ||||
| Reburning linear change rate, % (1600℃ × 3h) | ±0.3 | ||||
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