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What is the difference between Roasting and calcination .....
Answers
Answer:
Explanation:
Roasting is the process in which used at the time of extraction of a metal from its sulfide ore. In this process, adequate amount of oxygen is supplied. This results in the formation of metal oxide with release of sulfur dioxide gas.
Calcination is the process which is used at the time of extraction of a metal from its carbonate ore. In this process, limited amount of oxygen is supplied. This results in the formation of metal oxide with the release of carbon dioxide gas.
CALCINATION IS THE PROCESS OF HEATING CONCENTRATED ORE IN THE ABSENCE OF AIR AT A TEMPERATURE BELOW ITS MELTING POINT.CARBONATES AND HYDROXIDES OF METALS DECOMPOSE TO FORM OXIDES.
ROASTING IS THE PROCESS OF HEATING CONCENTRATED ORE IN A CURRENT OF AIR AT A TEMPERATURE BELOW ITS MELTING POINT.WHEN THE CONCENTRATED ORE IS SUBJECTED TO ROASTING ,THE MOISTURE PRESENT IN IT IS REMOVED AS VAPOUR.