Introduction
Magnesia-aluminum spinel ramming mix is an unshaped refractory material primarily composed of magnesia-aluminum spinel, formed by manual or mechanical ramming, and widely applied in metallurgy, cement, and other high-temperature industries.
The core advantage of magnesia-aluminum spinel ramming mix lies in leveraging its high melting point (2135°C), excellent alkaline corrosion resistance, thermal shock resistance, and chemical stability to protect equipment in extreme high-temperature and corrosive environments. This extends the service life of industrial kilns and containers while addressing environmental protection needs (e.g., replacing chromium-containing materials). Its unshaped construction characteristics (rammable molding) also enhance adaptability in complex structures or repair scenarios.
Advantage
High Melting Point and Thermal Stability
Magnesia-aluminum spinel (MgAl₂O₄) has a melting point of 2135°C, maintaining structural stability in extreme high-temperature environments (1600–1700°C). This makes it suitable for harsh conditions in steel and non-ferrous metal smelting.
Strong Alkaline Slag Erosion Resistance
Its chemical composition, when combined with magnesia sand (MgO), forms an alkali-resistant system. It effectively resists erosion from CaO-MgO-SiO₂-based alkaline slags in steelmaking, as well as from high-nickel slags, matte, and other strongly alkaline melts in nickel-copper smelting.
Excellent Thermal Shock Resistance
With a low coefficient of thermal expansion (≈7.6×10⁻⁶/°C), the spinel crystal structure buffers thermal stress caused by abrupt temperature changes, preventing material cracking or spalling.
High Strength and Abrasion Resistance
After ramming, it forms a dense structure with room-temperature compressive strength of 50–80 MPa. It retains high mechanical properties at 1400°C, resisting scouring and abrasion from molten steel and slag.
Adaptability to Irregular Construction
As a ramming mix, it can be shaped on-site to fit complex furnace geometries (e.g., furnace bottom corners, slag line curves) or repair localized damage-eliminating the need for custom refractory bricks and reducing construction difficulty and costs.
Reusability and Repairability
In scenarios with non-penetrative local wear, the failed layer can be removed and repacked with fresh material, extending overall service life and lowering maintenance costs.
Chromium Pollution-Free
In cement kiln firing zones, it replaces traditional magnesia-chromite bricks, preventing hexavalent chromium (Cr⁶⁺) leaching at high temperatures. This complies with environmental standards.
Low Volatility and Chemical Stability
It exhibits no harmful reactions with molten glass, steel, or other media at high temperatures, ensuring no contamination of the melt.
Excellent Slag Penetration Resistance
Its dense structure prevents slag, glass vapor, etc., from penetrating the material, avoiding layer-by-layer spalling caused by infiltration.
Low Thermal Conductivity
Poor high-temperature thermal conductivity reduces furnace heat loss, aiding energy conservation (e.g., maintaining heat exchange efficiency in glass kiln regenerators).
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Raw Materials
The main raw material is magnesia-aluminum spinel, which can be artificially synthesized using magnesium oxide and alumina as raw materials through processes like sintering or electrofusion. High-purity magnesia sand aggregates, binders, and additives may also be incorporated to enhance performance and construction properties.
Physical and Chemical Specifications
|
Items |
ZFMA-1 |
ZFMA-2 |
|
|
Al2O3 % |
65 |
75 |
|
|
Refractoriness °C |
1750 |
1770 |
|
|
Linear Dimensional Change % |
-0.02 |
-0.4 |
|
|
Cold Crushing Strength MPa ≥ |
110°C×24h |
50 |
60 |
|
1100°C×4h |
60 |
70 |
|
|
Breaking Strength MPa ≥ |
110°C×24h |
9 |
11 |
|
1100°C×4h |
10 |
12 |
|
|
Maximum Service Temperature °C |
1200 |
1400 |
|
Process
Raw material preparation stage: Includes spinel synthesis, magnesia treatment, and additive preparation.
Mixing stage: Comprises pre-mixing and wet mixing.
Quality control: Involves multiple tests to ensure compliance with standards.
Molding and post-processing: Includes curing and baking.
Environmental protection measures: Implemented throughout the production process.
Application
I. Iron and Steel Metallurgy
Converter and Electric Furnace
Application parts: Ramming layers for furnace bottom and walls.
Advantages: Withstands erosion from 1600–1700°C molten steel and alkaline slags, extending furnace life.
Typical scenario: Effectively resists molten steel flow and slag chemical erosion during high-temperature smelting, reducing furnace maintenance frequency.
Steel Ladle
Application site: Ramming construction layer in the slag line area.
Advantage: Extends ladle life to over 100 heats (vs. ~60 heats for traditional brick linings).
Action principle: Maintains structural stability under repeated steel slag scouring.
II. Non-Ferrous Metal Smelting
Nickel & Copper Smelting Furnaces
Application parts: Furnace bottom and wall linings.
Performance advantage: Resists erosion from high-nickel slags, matte, and other strongly alkaline melts.
Scenario requirements: In nickel/copper smelting, the highly corrosive melt requires the chemical stability of magnesia-aluminum spinel to ensure long-term furnace safety.
III. Other High-Temperature Industries
Cement Kilns
Application parts: Firing zone, replacing traditional magnesia-chromite bricks.
Performance advantage: Withstands CaO-based clinker slag erosion at 1450–1600°C while reducing chromium pollution (traditional bricks contain hexavalent chromium, prone to environmental contamination).
Environmental value: Meets green production standards, minimizing heavy metal risks in industrial waste.
Glass Kilns
Application part: Regenerators (heat storage chambers).
Performance advantage: Prevents glass melt vapor penetration, maintaining heat exchange efficiency.
Action principle: Maintains a dense structure at high temperatures to block volatile glass components from infiltrating refractories, avoiding regenerator clogging or thermal efficiency loss.
IV. Other Special Scenarios
High-temperature furnace repair: As an unshaped refractory, enables rapid repair of localized kiln damage without full lining replacement, cutting maintenance costs.
High-temperature experimental equipment: Used to build heat/corrosion-resistant reaction vessels or hearths for research and industrial experiments.
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