Introduction
The main crystal phase of fused magnesia is periclase, and the grain size is very large, with the largest grains reaching the millimetre level. The intergranular silicate phase is distributed as a thin film, with a thickness ranging from 1 to 10 μm, and its composition is mostly CMS or C₃MS₂. The grain boundaries are thin and relatively straight.
Due to its low number of inter- and intra-crystalline pores, high bulk density, and large crystal size, it exhibits excellent high-temperature properties.
Generally, it has strong resistance to high temperatures, is not easily melted by alkaline substances, and is not easily eroded by molten metal at high temperatures. It also has excellent thermal conductivity at room temperature.
As a raw material for producing high-grade refractory materials-such as magnesia-carbon bricks (composed of graphite and fused magnesia)-it is commonly used in converter steelmaking and furnace refining. It contributes to shorter melting cycles, longer furnace life, and improved steel quality.
Advantage
High purity: The magnesium oxide content is usually above 95%, with high-quality products reaching 98%–99% or even higher, and containing very low levels of impurities.
High density: The melting process makes the magnesia particles crystalline and dense, resulting in a high bulk density (generally above 3.5 g/cm³) and a hard structure.
High temperature resistance: With a refractoriness as high as 2800 °C or more, it maintains stable physical and chemical properties in high-temperature environments and is not easily softened or melted.
Erosion resistance: It exhibits strong resistance to both acidic and alkaline slags, as well as molten metals, and is not prone to chemical reactions.
Good thermal conductivity: It retains a certain degree of thermal conductivity even at high temperatures, making it suitable for applications that require effective heat transfer.
Physical And Chemical Specifications
|
Indicator |
MgO%≥ |
Al2O3%≤ |
SiO2%≤ |
CaO%≤ |
B.D.g/cm3≥ |
Loss on Ignition (LOI)%≤ |
|
Grade |
||||||
|
YXFM98A |
98 | 0.2 | 0.35 | 0.7 | 3.50 | 0.2 |
|
YXFM97A |
97 | 0.2 | 0.6 | 1.2 | 3.50 | 0.2 |
|
YXFM96A |
96 | 0.3 | 0.8 | 1.6 | 3.45 | 0.2 |
|
YXFM98B |
97.5 | 0.2 | 0.7 | 1.5 | 3.50 | 0.2 |
|
YXFM97B |
96.5 | 0.2 | 0.8 | 1.4 | 3.50 | 0.2 |
|
YXFM96B |
96.5 | 0.2 | 1.0 | 2.0 | 3.45 | 0.2 |
Process
Raw material selection: Usually, natural magnesite (MgCO₃) with high purity or lightly calcined magnesia (MgO content generally above 90%) is used to ensure the purity of the finished product.
Melting treatment: The raw material is heated to over 2700 °C in an electric arc furnace, causing impurities (such as SiO₂, Fe₂O₃, CaO, etc.) to separate from the magnesium oxide and form molten magnesium sand.
Cooling and processing: After natural or controlled cooling, the molten magnesium sand solidifies into lump electrofused magnesia, which is then crushed and sieved into products of different particle sizes.
Application
Electrofused magnesia is the core raw material for manufacturing high-grade refractories and is widely used in the following fields:
Iron and steel industry: It is used as refractory bricks and castables for lining high-temperature equipment such as converters, electric arc furnaces, ladles, etc., to withstand the high-temperature erosion caused by molten steel and slag.
Non-ferrous metal smelting: Used as refractory lining for smelting furnaces, resisting corrosion by non-ferrous metal melts.
Glass industry: Used in the heat storage chamber of glass kilns, pool walls, and other parts to withstand the high temperature of molten glass and chemical erosion.
Other high-temperature industries: Such as cement kilns, waste incinerators, and high-temperature reactors in the petrochemical industry, where it provides high-temperature and wear-resistant refractory protection.
Advantages and considerations of electrofused magnesia sand
Advantages: Compared with sintered magnesia (produced by calcining rather than fusing), electrofused magnesia has higher purity, a denser structure, and better resistance to high temperatures and erosion, making it suitable for applications with extremely high requirements for refractory materials.
Precautions: Avoid moisture during storage and transport to prevent moisture absorption and chalking, which can affect performance.
Why chooes us?
Geographical Advantage
As a local enterprise rooted in Yingkou, Liaoning Province, we have established a comprehensive control system from mining to raw material screening, relying on the rich and high-quality magnesite resources in the surrounding area.
Rigorous Testing Of Ingredients
All raw materials used in the production of electrofused magnesia, refired magnesia, medium-grade magnesia, and high-purity magnesia undergo stringent compositional testing (MgO content, impurity indicators, etc.) to ensure that product performance problems caused by raw material defects are avoided at the source.
Owned Crushing Line
Our stable raw material supply base not only guarantees continuous production capacity but also maintains product quality at the leading level in the industry.
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
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