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How many of the following metallurgical processes do NOT involve high temperature? Froth flotation, Cupellation, Hydrometallurgical reduction, Self-reduction
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Correct answer: 2
Solution
Froth flotation is a physical concentration method done at ambient temperature. Hydrometallurgical reduction (leaching + displacement/electrolysis) uses aqueous solutions without high heat. Cupellation involves blowing air over molten lead alloy at high temperature. Self-reduction (e.g., Cu2S -> Cu) requires a furnace. Hence 2 processes do not involve high temperature.
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