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1.difference between roasting and calcination??

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1.difference between roasting and calcination??

Posted by Palak Sharma 5 years, 10 months ago

CBSE > Class 10 > Science

3 answers

Rocky Handsome 5 years, 10 months ago

Roasting : heating reaction in the presence of oxygen Calcination : heating reaction in the absence of oxygen

Yogita Ingle 5 years, 10 months ago

Calcination	Roasting
Calcination is a process in which an ore is heated in the absence of air or air might be supplied in limited quantity	Roasting involves heating of ore higher than its melting point in the presence of air or oxygen.
Calcination involves thermal decomposition of carbonate ores.	Roasting is carried out mostly for sulfide minerals.
During calcination moisture is driven out from an ore.	Roasting does not involve dehydrating an ore.
Carbon dioxide is given out during calcination	During roasting large amount of toxic, metallic and acidic compounds are released.

Shubham Kumar 5 years, 10 months ago

The sulphide ores are converted into oxides by heating strongly in the presence of exess air is known es rusting and carbonates are changed into oxide by heating strongly in the presence of limited air is known as calcination

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