Roasting, calcination, smelting
Metallurgy and Extraction (General Principles) · Chemistry
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Study notes
Zinc blende (ZnS) can't be reduced by carbon directly. Show the route. Step 1: Roast: 2ZnS + 3O₂ → 2ZnO + 2SO₂ (sulphide → oxide). Step 2: Smelt: ZnO + C → Zn + CO (oxide reduced by coke). Step 3: Zn vapour distilled (bp 907°C) and condensed. Step 4: Two-step dance: convert to oxide first, then reduce — metallurgy's standard trick!