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Fused Magnesia Premium High-Performance Refractory Raw Material
Introduction
Fused magnesia, also known as electrofused magnesium oxide (MgO), is a high-end alkaline refractory raw material. It is produced by melting high-purity magnesite or light-burned magnesia in an electric arc furnace at an ultra-high temperature between 2800°C and 3000°C, followed by controlled cooling, crushing and precise classification. With a compact and uniform crystalline structure, outstanding high-temperature stability and strong anti-corrosion capability, fused magnesia has become an indispensable material for advanced refractory products. It is widely trusted in various high-temperature industrial scenarios including metallurgy, cement and glass manufacturing.
Production Process
The production of fused magnesia adopts strict and standardized processing procedures. First, high-grade magnesite ore or light-burned magnesia powder with low impurity content is carefully selected as the base raw material. Then, the raw materials are fully melted into a homogeneous liquid state in an electric arc furnace under ultra-high temperature, which effectively removes volatile impurities and achieves high purification. After melting, the materials are cooled slowly under controlled conditions to form large, dense periclase crystals with extremely low internal porosity. Finally, the cooled magnesia ingots are crushed, screened and graded into different particle sizes of grains and powder to meet diverse industrial application requirements.
Key Performance Characteristics
Fused magnesia boasts excellent comprehensive performance. It features high chemical purity, with conventional grades reaching over 95% MgO content and premium grades up to 98% to 99.5%, accompanied by extremely low oxide impurities. The material has a dense solid structure and low porosity, providing strong resistance to molten slag penetration and high-temperature abrasion. With a melting point exceeding 2800°C, it maintains stable volume and mechanical strength under long-term continuous high-temperature working conditions.
In addition, fused magnesia delivers superior slag corrosion resistance, effectively adapting to complex alkaline high-temperature environments. It also possesses excellent thermal shock stability, resisting cracking and spalling caused by rapid temperature changes. Its reliable high-temperature dielectric and insulation properties make it suitable for high-temperature electrical insulation and advanced ceramic manufacturing scenarios.
Main Industrial Applications
Fused magnesia serves as a core raw material for high-grade refractory products in multiple industries. In the metallurgical field, it is widely used to produce high-performance magnesia bricks, magnesia-carbon bricks and monolithic refractories, which are applied in electric arc furnaces, steel converters, ladles and key furnace repair materials. It is also an essential material for manufacturing slide gates, nozzles and other precision components for high-purity steel production.
In the cement and glass industries, fused magnesia refractory materials are applied to the lining of cement rotary kiln burning zones and glass furnace melting tanks. They effectively resist alkaline erosion and high-temperature wear, ensuring stable and long-term operation of industrial kilns. Beyond traditional high-temperature industries, fused magnesia is also widely used in advanced high-temperature ceramics and industrial electric heating insulation equipment, providing reliable material support for high-end manufacturing.
Fused Magnesia and Dead-Burned Magnesia Differences
Fused magnesia and dead-burned magnesia are both mainstream magnesia refractory materials, but they differ greatly in production technology and performance. Fused magnesia is smelted at an ultra-high temperature of 2800°C to 3000°C through electric arc melting, with higher purity, denser crystal structure and lower porosity. It has far better slag resistance, thermal stability and overall durability, making it suitable for harsh high-temperature and high-corrosion working conditions and key wear-resistant parts of industrial kilns.
Dead-burned magnesia is produced through conventional high-temperature calcination at 1600°C to 2000°C. It features stable basic performance and higher cost efficiency, but its density, purity and anti-erosion ability are slightly lower than fused magnesia. It is more suitable for conventional furnace lining structures and general insulation projects with ordinary working conditions.
Our Product Advantages
We provide high-quality fused magnesia products with strict whole-process quality control, ensuring stable chemical composition and consistent physical performance of each batch of materials. Our products cover complete particle size specifications, with conventional grains and powder in sufficient stock, and customized processing can be carried out according to customers’ actual site needs and technical requirements.
Our high-purity fused magnesia features dense structure, excellent high-temperature resistance and long service life, which can effectively improve the overall operation stability of industrial kilns, reduce equipment maintenance frequency and lower long-term production and operation costs. With reliable product quality and rich industry experience, our fused magnesia has become a preferred refractory raw material solution for customers in metallurgy, cement, glass, chemical and other high-temperature industries worldwide.
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