please explain extraction of metals through roasting and calcination, and refining of metals.
Asked by sunil2791
7th September 2015,
7:00 PM
Answered by Expert
Answer:
Hi Sunil,
Concentrated ore is converted into metal oxide either by Roasting or Calcination.
Roasting
Process of heating the concentrated ore to a high temperature in the presence of excess air.
Examples:
Calcination
Process of heating the concentrated ore in the absence of air at a temperature not sufficient to melt the ore.
Refining of Impure Metal
- Distillation refining: For refining volatile metals, e.g. zinc, mercury.
- Liquation: For refining metals with low melting points, e.g. lead, tin.
- Oxidation refining: For refining metals by oxidation of their impurities, e.g. iron.
- Electrolytic refining: For refining impure metals by electrolysis, e.g. Cu, Al, Pb.
Answered by Expert
7th September 2015,
7:05 PM
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