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(a) Pyrometallurgy: The extraction of a metal from its concentrated ore by processes carried out at high temperature, such as roasting or calcination followed by reduction (smelting), is called pyrometallurgy.

(b) Roasting: Roasting is the process of heating a concentrated ore (usually a sulphide ore) strongly in excess of air below its melting point, so that it is converted into the oxide and volatile impurities are removed. Example: 2ZnS + 3O2 → 2ZnO + 2SO2.

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report
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