Introduction
Fused rebonded magnesia-chrome bricks are produced by first melting lightly calcined magnesia and chrome ore in an electric arc furnace to create fused magnesia-chrome sand. This material is then crushed, ground, mixed, formed, and fired. With minimized impurities and firing temperatures exceeding 1750°C, these bricks offer high-temperature performance superior to sintered magnesia-chrome bricks and comparable to fused bricks.
They exhibit an extremely high load softening temperature of over 1700°C and are characterized by excellent refractoriness, high strength at elevated temperatures, strong resistance to alkaline slag erosion, and good thermal stability. They also have moderate resistance to acidic slags. The main components of fused rebonded magnesia-chrome bricks are magnesia and chromium oxide (Cr₂O₃), with periclase and spinel as the primary mineral phases. This results in a high-quality refractory material with a uniform spinel distribution that enhances erosion resistance.
Advantage
High-temperature strength: High compressive and flexural strength; excellent erosion resistance at high temperatures (suitable for long-term use at 1600–1700°C).
Thermal shock resistance: Low coefficient of thermal expansion; better resistance to rapid temperature changes than ordinary magnesia-chrome bricks.
Corrosion resistance: Excellent resistance to slag, alkali vapors, and acidic gases (e.g., SO₂).
Spalling resistance: Dense microstructure reduces the risk of spalling during service.
Zinfon Refractory Technology Co.,Ltd.
We provide one-stop services from technical consultation to design, production, and after-sales support.
Raw Materials
High-purity magnesia (MgO) and chromite (Cr₂O₃) are melted in an electric arc furnace to produce fused magnesia-chromite sand. This fused material is then crushed, formed, and fired at high temperature.
Physical and Chemical Specifications
| Grade / Specifications | YXDMGe-18 | YXDMGe-20 | YXDMGe-24 | |
| Chemical Composition (%) | MgO % | 60 | 58 | 50 |
| SiO2 % | 1.5 | 1.5 | 1.5 | |
| Cr2O3 % | 18 | 20 | 24 | |
| Apparent Porosity (%) | 15 | 15 | 15 | |
| Bulk Density (g/cm3) | 3.2 | 3.22 | 3.25 | |
| Cold Crushing Strength (MPa) | 50 | 50 | 50 | |
| Refractoriness under Load ºC @0.2MPa | 1700 | 1700 | 1700 | |
Process
Rebonding process: Refers to the secondary sintering of fused magnesia-chrome sand (typically ≥1700°C) to create a stable direct-bonded structure and enhance material properties.
Process Characteristics
Advantages of fusion: Homogeneous raw material composition in the molten state; dense product structure; excellent erosion resistance.
Rebonding technology: Forms a direct bonding network via high-temperature sintering, significantly improving high-temperature strength and thermal shock resistance.
Energy consumption control: The electrofusion process is energy-intensive; optimizing electrode design and melting efficiency is essential.
Applications
Cement industry: Used in the transition and firing zones of cement rotary kilns; resists clinker erosion and alkali corrosion. High Cr₂O₃ formulations (10–15%) enhance resistance to clinker attack.
Glass industry: Applied in heat storage chambers and working pools of glass furnaces; resists high-temperature glass corrosion. Lower Cr₂O₃ formulations (5–8%) help reduce contamination of the glass melt.
Metallurgy: Suitable for non-ferrous metal smelting furnaces (e.g., copper smelting); resists slag and molten metal erosion. Addition of metallic aluminum powder enhances resistance to metal penetration.
Main Application Examples
Working layer of top-blown converter hearths, in direct contact with molten copper
Horizontal converter mouths
Anode furnace mouths
Flash furnace reaction towers
Electric furnace mouths
Bottom working layers of Kiefsite furnaces
Walls and bottoms of Ausmelt furnaces
Slag line and tuyere areas of oxygen-enriched bottom-blown furnaces
Comparison of electrofusion recombined magnesium-chromium bricks with other magnesium-chromium bricks
1. Key Performance Comparison
2.Process Differences
3. Comparison of application scenarios
Why chooes us?
Our high-temperature tunnel kiln can achieve firing temperatures up to 1800°C, and we have extensive research on firing times. We also apply a salt impregnation process for fused rebonded magnesia-chrome bricks, which can achieve a density of over 3.35 g/cm³ after impregnation.
01/Customized dimensions and shapes
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02/Delivery cycle and logistics
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Sea freight, land freight. Determine the mode of transportation according to the needs
About 30 days, customized products delivery time depends on the actual situation.
03/Customized packaging
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04/Purchase ZINFON refractory Bricks at Reasonable Prices
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The price of refractory bricks is a known key factor influencing customers' purchasing decisions. Therefore, we offer affordable refractory bricks for sale. Here are several reasons why ZINFON provides refractory bricks at competitive prices:
factory price
By collaborating with ZINFON, we ensure that customers enjoy the ex-factory price of refractory bricks, reducing costs from middlemen or distributors. This allows customers to obtain the most cost-effective pricing directly from the source.
low raw materical cost
ZINFON is surrounded by abundant mineral resources. With these high-quality materials, customers can obtain products that are both affordable and excellent in performance.
mass production
ZINFON possesses advanced production equipment and technologies, enabling the factory to achieve economies of scale and reduce unit production costs. Meanwhile, it ensures a continuous supply of high-quality products at preferential prices.
It is worth noting that while price is an important factor, it should not be the sole determinant of your purchasing decision. When buying refractory bricks from ZINFON, quality, reliability, and technical support are equally important considerations.
By choosing ZINFON as your supplier, you can access high-quality refractory bricks, a wide range of other refractory materials, and comprehensive support. Contact ZINFON Refractories immediately to discuss your specific requirements and obtain customized solutions!
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Our address
Qinghua Management Dist., Dashiqiao City, Yingkou City, Liaoning, China
Phone Number
+8613700131695
+8618540210631
info@zinfon-refractory.com
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