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Basic terms used in metallurgy calcination roasting etc.
Answers
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Roasting : It is the process of converting an ores to oxide by strongly heating it in the presence of excess of air . ... Calcination : It is the process of converting an ores to oxide by strongly heating it in limited air . For example carbonate ores are converted into the oxide by heating in the absence of air.
Answer:
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.
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