alleryStart learning →Which pair of operations typifies pyrometallurgical processes involving gases and solids?
ALeaching and cementation
BCalcining and roasting
CElectrowinning and refining
DFlotation and washing
Answer & Solution
Correct answer: B. Calcining and roasting
Calcination and roasting heat a solid ore in contact with gas without melting it, unlike smelting which gives molten products.
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