Chrome Corundum Brick a high-performance refractory material known for their excellent high-temperature resistance, corrosion resistance, and thermal shock stability.It is widely used in high-temperature industrial sectors such as metallurgy, glass, petrochemicals, and hazardous waste disposal.Its typically contain 60-90% aluminum oxide and 10-25% chromium oxide, and may also contain small amounts of impurities such as silicon oxide and iron oxide. Their microstructure consists of corundum crystals, chromite spinel, and a small amount of glassy phase. This composite structure provides the material with excellent comprehensive properties.
Production Process
The production process of Chrome-Corundum Brick typically involves the following main steps:
Material Preparation
1).Synthesizing electrofused chrome corundum material: Weighing and mixing aluminum oxide and chromium oxide raw materials in specific proportions (e.g., Al₂O₃:Cr₂O₃ = 75-90:8-15), then electrofusing them and crushing into granules.
2).Preparation of other raw materials: Crushing and screening corundum, chrome ore, chromium oxide, and other raw materials to achieve the desired particle size.
01
Material Proportioning
Based on the desired performance requirements, different particle sizes of chrome corundum material, corundum material, chrome ore material, chromium oxide material, and other additives (e.g., zircon sand, andalusite fine powder, calcined bauxite, etc.) are precisely proportioned and mixed.
02
Binder Addition
The selected binder (e.g., phosphoric acid, monoaluminum phosphate, alumina-chromium oxide sol, etc.) is added to the mixed materials and thoroughly stirred. The mixture is usually left to age for a period (e.g., ≥24 hours) to allow the binder to fully penetrate and react.
03
Pressing and Shaping
The uniformly mixed materials are pressed into brick blanks under high pressure.
04
High-Temperature Firing
The shaped brick blanks are fired in a high-temperature kiln, typically at temperatures ranging from 1600℃ to 1700℃, or even higher. Under high temperatures, complex physical and chemical reactions occur in the raw materials, forming a dense solid solution structure that imparts the desired properties to the chromium corundum bricks.
05
Technical Data of Chromium-Corundum Brick
|
Item |
Chrome Corundum brick |
Titanium Corundum brick |
|
|
CC12 |
TC |
||
|
Al2O3,%≥ |
73 |
94 |
|
|
Fe2O3,%,≤ |
1.0 |
0.4 |
|
|
Cr2O3,%≥ |
12 |
--- |
|
|
TiO2,%≥ |
--- |
1.0 |
|
|
Bulk density,g/m3,≥ |
3.0 |
3.6 |
|
|
Porosity,%,≤ |
20 |
2 |
|
|
CCS,Mpa ≥ |
80 |
300 |
|
|
0.2Mpa RUL, ℃≥ |
1700 |
1650 |
|
|
Refractoriness,℃,≥ |
1810 |
1810 |
|
|
Reheating linear change,% |
1550℃x2h |
-- |
±0.1 |
|
1600℃x2h |
±0.2 |
-- |
|
Performance Characteristics of Chromium Corundum Brick
Due to their unique chemical and physical properties, corundum refractory brick excel in harsh industrial conditions:
High Refractoriness
Service temperature can reach 1800-1900°C, with load softening temperature typically above 1700°C.
01
Excellent Corrosion Resistance
Exceptional resistance to molten slag, glass melt, and chemically erosive substances. Slag resistance increases with higher Cr₂O₃ content.
02
Good Thermal Shock Stability
Can withstand rapid temperature changes without cracking or spalling, extending their service life. Adding calcined bauxite, andalusite, etc., can further improve their thermal shock stability.
03
High Strength and Density
Possess high strength at both room and high temperatures, Cold crushing strength >80 MPa.
04
Good wear resistance
With superior anti-scouring and anti-spalling properties, extending service life.
05
High density and Good Volume Stability
Possess dense structure, Do not easily shrink or expand at high temperatures, ensuring the overall stability of the furnace lining.Low shrinkage during high-temperature use with good dimensional stability.
06
Oxidation/Reduction Resistance
Cr₂O₃ remains stable in both oxidizing and reducing atmospheres.
07
Applications of Chromium Refractory Brick
Due to their unique and excellent properties, chrome refractory bricks are widely used in critical parts of various high-temperature industrial furnaces and kilns:
Metallurgy:
1). Steel Metallurgy: Ladle slag lines, RH furnace immersion tubes, blast furnace tuyere assemblies,linings of steelmaking electric arc furnaces and refining furnaces, particularly suitable for areas in direct contact with molten steel.
2).Non-ferrous Metal Smelting Furnaces: Such as the linings of copper, nickel, lead, zinc, and aluminum smelting furnaces. They effectively resist the corrosion of complex slags containing Fe₂O₃-SiO₂-CaO, significantly extending the service life of the furnace lining.
Glass Industry:
1).Glass Melting Furnaces:Critical parts of glass melting furnaces,such as Glass tank walls, throat sections.Especially in cross-fired glass tank furnaces, chrome corundum bricks used for fully corroded sidewalls and electrode blocks can effectively resist erosion from molten glass without causing discoloration of the glass.
2).For float glass furnaces and areas in contact with molten glass, (the material) exhibits outstanding resistance to glass corrosion and excellent thermal shock performance.
Petrochemical Industry: Linings for petrochemical gasifiers,cracking furnaces, heating furnaces, particularly suited for resisting molten coal slag erosion.
Environmental and Hazardous Waste Disposal: Used in hazardous waste incinerators and volatilization kilns, resistant to chemical corrosion and high-temperature scouring.
Cement Industry: Rotary kiln transition zones, burning zones.
Sulfur Recovery Acid Gas Incinerators: Can significantly resist acidic corrosion caused by sulfur-containing gases, protecting the metal shell and extending equipment operating cycles.
Packaging and Shipping of Chrome Corundum Brick
1.Packed on wooden pallets with moisture-proof film to prevent damage.
2.Packed on wooden box.
3.Keep in dry, ventilated areas.
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