Alumina

Alumina serves as the fundamental raw material for aluminum ingot production and is the indispensable precursor for high-quality White Fused Alumina (WFA) and various synthetic corundum products. Characterized by its excellent flowability, rapid dissolution, and superior fluorine absorption, it is perfectly suited for molten salt electrolysis. Beyond aluminum smelting, our premium Alumina is a critical component in the manufacturing of advanced ceramics, high-grade refractories, and wear-resistant materials, ensuring exceptional thermal stability and structural integrity in demanding industrial applications.

Index	Al₂O₃	SiO₂	Fe₂O₃	Na₂O	CaO	LOI	Moisture
Premium Grade	≥98.6	≤0.04	≤0.02	≤0.30	≤0.02	≤1.0	≤0.5
Grade AO-1	≥98.5	≤0.06	≤0.03	≤0.40	≤0.03	≤1.0	≤0.5
Grade AO-2	≥98.4	≤0.08	≤0.04	≤0.50	≤0.04	≤1.5	≤0.5

Product Applications

Alumina, or aluminum oxide (Al₂O₃), is essentially the “Swiss Army knife” of industrial minerals. Its combination of extreme hardness, high melting point (about 2,072°C), and chemical inertness makes it indispensable across dozens of high-stakes industries.

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1. Refractories and High-Temperature Linings

Because alumina can take the heat without flinching, it is the backbone of the refractory industry. It is used to create bricks, castables, and linings that protect equipment from molten metal and extreme thermal cycles.

• Steel & Iron Production: Used in ladles, tundishes, and furnace roofs where resistance to “slag” (chemical erosion) is critical.
• Cement & Glass Kilns: Provides a barrier against the corrosive environment of melting glass or rotating cement kilns.
• Neutral Dry Ramming Mass: Specifically used in induction furnaces to provide a stable, heat-resistant lining for melting various alloys.

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2. Abrasives and Surface Finishing

On the Mohs scale of hardness, alumina sits at a 9, just behind diamond. This makes it a premier material for wearing other things down.

• White Fused Alumina (WFA): High purity (99%+ Al₂O₃). Used for precision grinding of high-carbon steel and in “cool” cutting operations where you want to avoid burning the workpiece.
• Brown Fused Alumina (BFA): Contains slight impurities (like titania) that make it tougher and less friable than WFA. It’s the workhorse for sandblasting, heavy-duty grinding wheels, and anti-skid surfaces.
• Sandpaper & Polishing: Found in everything from hardware store sheets to high-end lapidary polishing compounds.

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3. Advanced Ceramics and Electronics

Alumina isn’t just “industrial dirt”—it can be refined into high-tech components. It is an excellent electrical insulator that still manages to conduct heat reasonably well.

• Circuit Substrates: Used as the “floor” for microchips and electronic circuits to dissipate heat.
• Spark Plug Insulators: The white ceramic part of a car’s spark plug is typically high-purity alumina.
• Wear Parts: Used for pump seals, nozzles, and valve components that need to survive high-pressure, abrasive environments.

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4. Specialized & Medical Applications (The “Wildcards”)

Beyond the heavy industrial sectors, alumina’s biocompatibility and chemical stability lead to some surprising uses:

Water Filtration: Activated alumina is used to remove fluoride, arsenic, and selenium from drinking water.

Medical Implants: High-density alumina is used for prosthetic hips and dental implants because the body doesn’t reject it and it doesn’t wear down easily.

Catalyst Supports: In chemical and petroleum industries, alumina acts as a “scaffold” for chemical reactions, providing massive surface area for catalysts to sit on.