Overview
Industrial casting-grade bauxite is a naturally occurring aluminum ore primarily composed of aluminum hydroxides and various impurities. It serves as the principal source material for aluminum metal production through the Bayer process. In foundry applications, bauxite is valued for its high alumina content and refractory properties. The material typically contains 50-85% Al2O3, with the remainder consisting mainly of silica, iron oxides, and titanium dioxide. Quality specifications for casting applications focus on chemical composition and thermal stability.
Physical and Chemical Properties
Bauxite's physical characteristics vary significantly depending on its geological origin. The material exhibits a Mohs hardness of 1-3, making it relatively soft compared to many industrial minerals. Its specific gravity ranges from 2.5 to 3.5 g/cm³, with higher values indicating purer alumina content. Chemically, bauxite is amphoteric - reacting with both acids and bases. This property is crucial for its processing into alumina. The material's refractory nature allows it to withstand temperatures exceeding 1600°C when used in foundry applications. Moisture content typically ranges between 10-30% in raw ore, requiring drying before industrial use.
Main Applications
The primary use of casting-grade bauxite is in aluminum production, where it undergoes refining to produce alumina (Al2O3) before electrolytic reduction to aluminum metal. In foundry operations, bauxite serves as a molding material and flux additive. Secondary applications include production of high-alumina refractory bricks for furnace linings and as an abrasive material. Some specialty ceramics and chemical catalysts also utilize processed bauxite. The material's thermal stability makes it particularly valuable in ferrous and non-ferrous metal casting processes.
Safety and Storage
Bauxite presents moderate health risks primarily through dust inhalation during handling. Proper respiratory protection and dust control measures are essential in industrial settings. The material is not classified as flammable or explosive under normal conditions. Storage requirements include protection from moisture to prevent caking and quality degradation. Bulk storage should utilize covered areas with proper drainage. Bauxite is generally stable but may react with strong acids or bases, requiring segregation from these materials in storage facilities.
B2B Procurement Guide
Industrial buyers should specify key parameters including alumina content (typically 60-85%), silica ratio (important for refractory applications), and iron oxide content (affects color and some properties). Particle size distribution is critical for specific applications. Quality certifications such as ISO 9001 and material safety data sheets should be requested from suppliers. Consider transportation logistics as bauxite is typically shipped in bulk quantities. Long-term contracts are common in the industry to ensure stable pricing and supply continuity.
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