Why an ore is heated below its melting point in the process of roasting and calcination?
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Ore is heated below its melting point because if they melt then the sulphur and carbonate impurities may be mixed and it would before tough to remove them. Thus in roasting and calcination ores are heated below melting point.
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Roasting and Calcination:
In order to remove the impurities present in the ore, it is heated below its melting point in the process of roasting and calcinations.
The process such as roasting and calcinations are used in metallurgy process in order to enrich the standard of the impurity. As the ores are obtained from the underground layer of soil it may have certain soil related impurities. In order to make the ore free of impurities, process such as roasting and calcinations is utilized.
Both the procedure follows same principle and the only difference is that in roasting, the ore is heated below its melting point in the presence of oxygen, whereas in calcination, it is carried out in a space devoid of air or oxygen.
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