Overview
Calcined bauxite aggregate is a processed form of raw bauxite, heated to temperatures between 1400–1800°C to remove moisture and increase alumina content. It is primarily composed of corundum (α-Al2O3) and mullite, giving it exceptional hardness and thermal resistance. The material is categorized by alumina content (typically 75–85%) and particle size (ranging from fine powders to coarse aggregates). Its industrial significance stems from its balance of cost and performance in high-temperature and abrasive environments.
Physical and Chemical Properties
Calcined bauxite aggregate exhibits a Mohs hardness of 8–9, comparable to topaz, and a high bulk density (1.5–1.8 g/cm³). Its porosity is low (3–5%), contributing to chemical inertness against acids and alkalis. Thermally, it retains structural integrity up to 1800°C, with a thermal expansion coefficient of 8×10⁻6/°C. The material’s reddish-brown hue comes from iron oxide impurities, which can vary between 2–10% depending on the bauxite source.
Main Applications
In refractories, calcined bauxite aggregates are used to line furnaces, kilns, and incinerators due to their thermal shock resistance. The abrasives industry employs them in grinding wheels and sandblasting media. Construction applications include anti-skid road surfaces (e.g., airport runways) and high-friction coatings. It also serves as a proppant in oil drilling and a raw material for synthetic mullite production.
Safety and Storage
While non-toxic, the dust generated during handling can pose inhalation risks. OSHA recommends P2 respirators and wet suppression methods for dust control. Storage should avoid humid conditions to prevent moisture absorption, which may reduce performance in refractory applications. Fire hazards are minimal, but the material’s high thermal mass requires caution when handling hot aggregates post-calcination. Spills should be cleaned with vacuum systems to minimize airborne particles.
B2B Procurement Guide
Buyers should prioritize suppliers who provide certified assay reports detailing Al2O3, SiO2, and Fe2O3 percentages. Particle size distribution (PSD) testing ensures consistency for applications like refractories or coatings. Bulk purchases (20+ tons) commonly attract 5–10% discounts. Spot-market prices fluctuate with bauxite mining output—notably influenced by policies in China (top producer) and Guinea. Consider FOB or CIF terms based on logistics costs.
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