Overview
High purity magnesia, also known as high-purity dead burned magnesia and fused magnesia, refers to magnesia raw materials with MgO content above 96%. It is produced from premium magnesite ore through flotation purification, fine grinding, ball pressing and ultra-high-temperature calcination above 1500°C, featuring dense periclase crystal structure, ultra-high melting point up to 2852°C and low impurity content. As a core alkaline
refractory raw material, it has become an indispensable base material for high-temperature industrial lining worldwide.
Our factory supplies full series high purity magnesia products, covering 96%, 97%, 98% and 99% MgO grades, including dead burned magnesia and fused magnesia with stable particle size distribution. Benefiting from abundant local magnesite mineral resources and complete high-temperature kiln production lines, we realize consistent batch quality and large-volume stable supply for global steel, cement, glass and non-ferrous metal manufacturers.
Core Advantages
- Outstanding high-temperature stability
With high bulk density over 3.3 g/cm³ and tiny closed pores, high purity magnesia maintains rigid structure under sustained temperature above 1700°C, without softening, creep or volume shrinkage. It resists frequent thermal cycling during furnace start-stop and avoids lining peeling or cracking.
- Superior slag & corrosion resistance
Low SiO₂, CaO and ferric impurities greatly reduce chemical reaction with molten steel, basic slag and alkaline flue gas. It effectively blocks slag penetration into refractory linings and extends furnace service life significantly, especially suitable for severe corrosion working conditions of steel converters and ladles.
- Low hydration risk & long service cycle
Full high-temperature dead burning eliminates active ingredients, featuring weak water absorption. Refractory bricks and castables made from our magnesia avoid early hydration failure during storage and construction, lowering maintenance frequency and production downtime for end users.
- Customizable specifications
We can adjust particle fractions, powder fineness and purity indexes as per customer technical requirements, matching raw material formulas for magnesia carbon brick, magnesia alumina spinel brick, ramming mix and magnesia castable.
Main Application Fields
Steel Industry (Primary Scenario)
High purity magnesia is the dominant raw material for
BOF, EAF, continuous casting ladle and tundish lining refractories. Magnesia carbon bricks, precast blocks and gunning mixes manufactured from it bear ultra-high temperature and strong slag erosion during steel smelting, cutting refractory consumption per ton of steel and improving continuous casting efficiency.
Cement & Non-Ferrous Industry
It serves as key raw material for
rotary kiln burning zone magnesia
spinel bricks, resisting long-term alkali vapor corrosion at 1400–1600°C. For copper, lead and zinc smelting furnaces, it stabilizes lining performance under repeated erosion of molten non-ferrous slag.
Glass, Petrochemical & Other High-Temperature Sectors
High purity fused magnesia with 99% MgO is adopted for glass melting tank bottom and burner blocks, preventing glass liquid contamination. It is also widely applied in high-temperature kilns of
ceramics, waste incineration and petrochemical reforming furnaces.
Our Supply Strength
Henan Hongtai Kiln Refractory Co., Ltd. has specialized in refractory raw material production since 2012. Our complete quality control system strictly tests MgO, CaO, SiO₂, bulk density and hydration rate for every batch before delivery. We support bulk tonnage export packaging with 25kg PP bags and 1-ton jumbo bags, with convenient railway and highway transport for timely shipment to India, Turkey, Vietnam, Kazakhstan and Southeast Asian markets.
We provide free technical formula consultation for customers, and offer competitive factory-direct prices for long-term large-volume orders. If you require specific purity, particle size or technical data sheet, feel free to contact our sales team for detailed quotation and samples.
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