Introduction
Regular bonded magnesia chrome brick is a common refractory material mainly used in high-temperature industrial equipment such as cement kilns, glass melting furnaces, and steel furnaces. Typically referred to simply as magnesia chrome bricks, this generally implies fired, ordinary magnesia chrome bricks, also known as silicate-bonded magnesia chrome bricks. These are alkaline refractory products with magnesite and spinel as the main mineral components.
Advantage
High-Temperature Performance:Service temperature: Suitable for 1400–1600°C, with short-term tolerance up to ~1650°C.
Mechanical Properties:Compressive strength: 60–100 MPa.
Thermal Shock Resistance:Moderate resistance to rapid temperature changes (e.g., withstands 3–5 cycles of water quenching at 1100°C).
Slag resistance:Effective against alkaline slags (e.g., steelmaking slag) due to the compatibility of magnesium oxide.
Oxidation Resistance:Chromium oxide (Cr₂O₃) forms protective scales at high temperatures, slowing the oxidation of MgO to MgO-Fe₂O₃ (periclase).
Lower Production Cost:Simplified manufacturing (no need for high-purity raw materials or ultra-high sintering temperatures) reduces energy and material costs.
Ease of Fabrication:Clay bonding allows for flexible shaping, making it suitable for complex brick geometries.
Zinfon Refractory Technology Co.,Ltd.
We provide one-stop services from technical consultation to design, production, and after-sales support.
Magnesium Oxide (MgO): 60%–80%; provides refractoriness and resistance to alkaline erosion.
Chromium Oxide (Cr₂O₃): 10%–30%; enhances high-temperature strength, thermal shock resistance, and creep resistance.
Binder: 5%–10% refractory clay or organic additives to ensure green body strength.
Physical and Chemical Specifications
| Grade / Specifications | YXMGe-8 | YXMGe-10 | YXMGe-12 | YXMGe-16 | YXMGe-18 | |
| Chemical Composition (%) | MgO % | 70 | 68 | 65 | 63 | 60 |
| SiO2 % | 3 | 3 | 3 | 3 | 3 | |
| Cr2O3 % | 8 | 10 | 12 | 16 | 18 | |
| Apparent Porosity (%) | 22 | 22 | 22 | 20 | 20 | |
| Bulk Density (g/cm3) | 2.95 | 3 | 3.05 | 3.1 | 3.15 | |
| Cold Crushing Strength (MPa) | 35 | 35 | 35 | 35 | 35 | |
| Refractoriness under Load ºC @0.2MPa | 1550 | 1580 | 1600 | 1600 | 1650 | |
| Thermal Shock Resistance 950ºC (Times) | 4 | 4 | 4 | 4 | 4 | |
| Thermal expansion % 1400°C | ||||||
| Thermal conductivity 400℃ (W/m.k) | ||||||
Process
Bonding Method:
Clay serves as the bonding agent, reacting with MgO and Cr₂O₃ at high temperatures to form a ceramic bond-a relatively simple process.
Sintering Temperature:
Approximately 1500–1600°C, lower than that of directly bonded MgCr bricks.
-Raw Material Preparation
MgO: Usually sourced from magnesite (MgCO₃), producing lightly calcined magnesia (MgO ≥ 85%).
Cr₂O₃: Obtained from calcined chromite (FeCr₂O₄), added at 10%–30%.
Binder: Refractory clays (e.g., kaolin or bentonite) added at 5%–10%.
-Dry Mixing
Mix MgO, Cr₂O₃, and clay in specified proportions.
-Wet Molding
Add water or an organic binder (e.g., carboxymethyl cellulose), then press hydraulically at ~100–200 MPa.
-Drying
Dry in a tunnel dryer at 110–150°C for 24–48 hours.
-Sintering
Sinter in a rotary or shuttle kiln at 1500–1600°C for 2–4 hours.
Key reaction: Clay reacts with MgO to form ceramic bonding phases (e.g., MgAl₂O₄).
-Quality Inspection
Test compressive strength, bulk density, apparent porosity, and thermal shock resistance.
-Finished Product Packaging
Bricks are packed with moisture-proof protection for safe transportation.
application
Regular bonded magnesia chrome bricks are widely used in:
Cement kilns
Transition zone (1400–1500°C): Exposed to clinker erosion and thermal shock.
Decomposition zone (1300–1400°C): Subject to alkali vapor (e.g., K₂O, Na₂O) and sulfur compounds.
Cooler linings: Used in zones not directly exposed to high heat.
Glass Furnaces
Melting section front wall (1500–1600°C): Faces molten glass and flames.
Clarification section sidewalls: Exposed to alkali vapors and silica.
Working tank and forehearth (1400–1500°C): Requires resistance to thermal shock and abrasion.
Flow holes: For resisting high-velocity molten glass flow.
Small and medium-sized industrial furnaces
Heating furnace linings: E.g., forging and rolling furnaces (800–1300°C).
Annealing furnace working layers: Protects furnace walls from oxidizing atmospheres and minor slag attack.
Drying furnace linings: Resists chemical corrosion in hot, humid environments.
Rotary kiln transition zones: For cement and chemical kilns.
Flue and chimney linings: Withstands acidic/alkaline exhaust gas.
Why chooes us?
01/Customized dimensions and shapes
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Customized Brick Shape
Provide Sample Sheets
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Mold Opening & Quotation
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Mold Opening & Sample Making
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Bulk Production Quotation
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Contract Signing
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Bulk Production
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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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Customize your brand
Logo customization, custom fonts, taglines and messages for packaging, signage, websites or printed materials.
Take your brand to the next level, contact us today to discuss your project!
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 material 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!
Pre-sales 7*24 hours online response
Provide professional after-sales protection
Our address
Qinghua Management Dist., Dashiqiao City, Yingkou City, Liaoning, China
Phone Number
+8613700131695
+8618540210631
info@zinfon-refractory.com
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