write difference between roasting and calcination in point
Answers
Roasting is a cooking method that uses dry heat where hot air envelops the food, cooking it evenly on all sides with temperatures of at least 150 °C from an open flame, oven, or other heat source. Roasting can enhance flavor through caramelization and Maillard browning on the surface of the food.
Key to a proper calcining process is the absence or limited supply of air or oxygen applied to and other solid materials to bring about a thermal decomposition, or removal of a volatile fraction. The calcination process normally takes place at temperatures below the melting point of the product materials.
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➡️Roasting is the process of heating ores of metals below their melting point in the presence of air to oxidise the impurities present in them
➡️Calcination is the process of heating ores of metals below their melting point in the absence of air to remove their impurities present in them.
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