The article contains sections titled: 1. General Aspects 1.1. Aluminum Hydroxides 1.2. Aluminum Oxide Hydroxides 1.3. Aluminum Oxide, Corundum 1.4. The Al 2 O 3 ‐ H 2 O System 1.5. Thermal Decomposition of Aluminum Hydroxides 1.6. Aluminates and Related Compounds 2. Bauxite, the Principal Raw Material 2.1. Definition and Geology 2.2. Composition and Properties 2.3. Genesis of Bauxites 2.4. Major Bauxite Deposits 2.5. Economic Aspects 3. Bayer Process 3.1. History and Procedure 3.1.1. Bauxite Preparation 3.1.2. Digestion 3.1.3. Equipment 3.1.4. Residue Separation 3.1.5. Precipitation 3.1.6. Impurities 3.1.7. Calcination 3.1.8. Evaporation 3.1.9. Residue Disposal 3.1.10. Energy in the Process 3.2. Economic Aspects 4. Other Processes for Alumina Production 4.1. Raw Materials 4.2. Alkaline Processes 4.3. Acid Processes 5. Metallurgical Alumina 5.1. Alumina Properties Required for Smelting 5.2. Typical Specifications for Metallurgical Alumina 6. Industrial Alumina Chemicals 6.1. Aluminum Hydroxides 6.2. Adsorbent and Catalytic Aluminas 6.2.1. Preparation of Activated Aluminas 6.2.2. Adsorbent Applications 6.2.3. Catalytic Applications 7. Ceramic Uses of Alumina 7.1. Calcined Alumina 7.2. Fused Alumina 8. Toxicology and Industrial Hygiene

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An in situ infrared investigation was conducted using four basic adsorbates to identify the acidic sites present onand aluminas. For two adsorbates, pyridine and 2,6-lutidine, adsorption studies were conducted between 298 and 983 K and at adsorbate pressures from 1.33 Pa (Pascal) to 1.33 kPa. The adsorption of acetonitrile and n-butylamine was conducted at 298 K by using adsorbate pressures from 0.66 to 8.65 kPa. Lewis acid and hydrogen-bonded complexes were identified on both aluminas for three adsorbates: acetonitrile, pyridine, and 2,6-lutidine. Using n-butylamine as the probe molecule, complexes for Bronsted, Lewis, and hydrogen-bonded sites were identified onand aluminas. Results from a calorimetric study of the aforementioned adsorbates and adsorbents are also discussed.

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