Ores are classified into four main types based on their chemical composition: oxide ores, sulfide ores, carbonate ores, and halide ores.
1. Oxide Ores:
- Metal combined with oxygen
- Examples:
- Hematite (Fe₂O₃) - iron ore
- Bauxite (Al₂O₃·2H₂O) - aluminum ore
- Cuprite (Cu₂O) - copper ore
- Generally easier to reduce (extract metal)
2. Sulfide Ores:
- Metal combined with sulfur
- Examples:
- Galena (PbS) - lead ore
- Zinc blende (ZnS) - zinc ore
- Copper pyrite (CuFeS₂) - copper ore
- Require roasting before reduction
3. Carbonate Ores:
- Metal combined with carbonate (CO₃²⁻)
- Examples:
- Calamine (ZnCO₃) - zinc ore
- Malachite (CuCO₃·Cu(OH)₂) - copper ore
- Siderite (FeCO₃) - iron ore
- Decompose on heating to release CO₂
4. Halide Ores (Chloride/Fluoride):
- Metal combined with halogens
- Examples:
- Rock salt (NaCl) - sodium ore
- Fluorspar (CaF₂) - calcium ore
- Cryolite (Na₃AlF₆) - used in aluminum extraction
- Less common than other types
Key Takeaways:
- Classification based on anionic component
- Each type requires different extraction methods
- Some metals occur in multiple ore types
- Determines metallurgical processing route