Magnesite powder is a finely ground, high-purity magnesium carbonate (MgCO₃) or its calcined form (MgO), widely used in the production of basic refractory materials. Known for its superior resistance to basic slags and high temperatures, it plays a key role in the steel, cement, and non-ferrous metallurgical industries.

What Is Magnesite Powder?

Magnesite powder is derived from natural magnesite ore through drying, calcination, and fine grinding. Depending on the processing method, it is available as:

• Caustic Calcined Magnesite (CCM) — lower temperature calcination (700–1000°C);
• Dead Burned Magnesite (DBM) — high-temperature calcination (1600–1800°C);
• Fused Magnesia (FM) — melted in electric arc furnaces for highest purity;
• The powder form ensures easy blending, fast reaction, and precise control in refractory formulations.

Key Advantages:

• Excellent basic slag resistance — ideal for steelmaking and ferroalloys;
• High refractoriness — up to 2000°C, depending on grade;
• Thermal and chemical stability — withstands extreme environments;
• Versatile usage — raw material for bricks, castables, and gunning mixes;
• Available in various particle sizes — from micronized to granular.

Applications:

• Basic refractory bricks (magnesia, magnesia-chrome, magnesia-carbon);
• Gunning and ramming masses for converters and EAFs;
• Slag conditioners and furnace fettling;
• Magnesium-based binders and mortars;
• Cement and ceramic industries;
• Fertilizers, rubber, and chemical processing (non-refractory grade).

Grades of Magnesite Powder:

• Caustic Calcined Magnesite (CCM);
• Reactivity: high;
• Purity: 85–92% MgO;
• Used in chemical, agricultural, and binder applications.

Dead Burned Magnesite (DBM):

• High-density, low-reactivity;
• Purity: 88–96% MgO;
• Used in refractory bricks and monolithics.

Fused Magnesia (FM):

• Highest purity and melting point;
• Purity: ≥97% MgO;
• For high-performance refractories.