The article contains sections titled: 1. Introduction 2. Properties 2.1. Physical Properties 2.2. Chemical Properties 3. Occurrence 4. Processing of Niobium Ores 4.1. Winning of Pyrochlore Concentrates 4.2. Treatment of Pyrochlore Concentrates 4.3. Production of Niobium Oxide from Columbites and Tantalites 4.3.1. Extraction Processes 4.3.2. Chlorination 5. Niobium Compounds 5.1. Oxides 5.2. Halides 5.3. Carbides and Hard Materials 6. Niobium Metal 6.1. Reduction of Niobium Pentoxide 6.2. Reduction of Halides 6.3. Refining 6.4. Uses 7. Ferroniobium 7.1. Production 7.2. Uses of Ferroniobium 8. Analysis 9. Economic Aspects
The article contains sections titled: 1. Introduction 2. Properties 2.1. Physical Properties 2.2. Chemical Properties 3. Occurrence 4. Extraction 4.1. Extraction and Processing of Ore Concentrates 4.2. Obtaining Ta ‐ Nb Concentrates from Tin Slags 4.3. Processing Tantalum Scrap 5. Metallic Tantalum 5.1. Production 5.2. Semifinished Products 5.3. Tantalum Powder for Capacitors 5.4. Other Uses 6. Tantalum Alloys 7. Tantalum Compounds 8. Analysis 9. Economic Aspects 10. Toxicology
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