Introduction
This product is formulated with high-purity light-burned magnesium oxide powder and high-purity light-burned dolomite powder as the main raw materials. After fine grinding and high-pressure molding, the mixture is calcined in a high-temperature rotary kiln.
Characterized by high density, strong mechanical strength, and excellent corrosion resistance, it serves as an ideal raw material for producing dry ramming materials and hot repair materials for electric furnace bottoms.
Advantage
Fire resistance: The theoretical melting point is about 2800°C, but the actual load softening temperature is reduced to 1600 - 1700°C due to the presence of Fe₂O₃ and CaO.
Thermal shock resistance: The spinel phase formed by Fe₂O₃ can buffer thermal stress, and the thermal shock resistance is better than that of low-iron magnesia.
Slag resistance: CaO reacts with alkaline slag (e.g. blast furnace slag) to form high viscosity calcium-magnesium olivine phase, which prevents slag penetration.
Volume stability: Free CaO absorbs water to form Ca(OH)₂ and expands about 98% in volume, which requires aging treatment or coating to inhibit hydrolysis.
Raw Materials
Magnesium oxide (MgO): The content typically ranges from 80% to 95%, serving as the main refractory component of magnesia sand.
Iron oxide (Fe₂O₃): The content is higher than that in ordinary magnesia (usually >3%, up to 10% or more), forming magnesium ferrate (MgFe₂O₄), a spinel-phase compound.
Calcium oxide (CaO): The content is usually >2% (up to 5% or more), existing in free form or combined state (e.g., calcium silicate).
Physical And Chemical Specifications
|
Indicator Grades |
MgO(%) |
CaC(%) |
Fe₂O₃(%) |
SiO2(%) |
Al₂O₃(%) |
Loss on lgnition(%) |
Bulk Density(g/cm3) |
Particle Size(mm) |
|
MCF-5 |
80-84 |
7-9 |
5-6 |
≤0.8 |
≤0.3 |
≤0.3 |
≥3.25 |
0-30 |
|
MCF-8 |
78-80 |
7-9 |
7-8 |
≤0.8 |
≤0.3 |
≤0.3 |
≥3.25 |
0-30 |
Process
Raw material sources
Natural magnesite: Ores with high Fe and Ca content (e.g., some low-grade magnesite) are used.
Synthesis method: Co-firing with magnesium oxide powder by adding iron compounds (e.g., Fe₂O₃) and calcium compounds (e.g., CaCO₃).
Key processes
High-temperature calcination: Calcined at 1600~1800°C to promote the formation of the spinel phase (MgFe₂O₄) and silicate phase (e.g., Ca₂SiO₄).
Electrofusion purification: High-purity products can be obtained through electrofusion (melting in an electric arc furnace) to reduce impurity segregation and improve density.
Application
Steel Industry
Blast furnace lining: Used in the cylinder and bottom sections of the furnace to leverage its resistance to alkaline slag erosion.
Converter slag protection: The high CaO content reacts with slag to form a protective layer, extending furnace service life.
Non-Ferrous Metallurgy
Copper/nickel smelting furnaces: Resistant to erosion from Fe-Ca slag systems, suitable for furnace walls and bottoms.
Cement Industry
Rotary kiln transition zone: Withstands erosion from high-calcium clinker and mitigates crusting issues.
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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