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Mention the difference between calcinati...

Mention the difference between calcination and roasting. How these processes are used in the extraction of zinc? Explain with the help of chemical equations. After these processes, is reduction necessary to obtain zinc ? Why ?

Text Solution

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Calcination : Carbonate ore when heated strongly in the absence of air is converted into metal oxide.
` ZnCO_(3) overset(" heat ")(rarr)ZnO + CO_(2)`
Roasting : Sulphide ore is strongly heated in the presence of air and is converted into metal oxide.
` 2 ZnS + 3O_(2) overset(Delta)(rarr) 2 ZnO + 2SO_(2)`
Yes, reduction is necessary after these proc=c,es to reduce the oxides to their metals.
`ZnO + C rarr Zn + CO `
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