Question

differentiate between rosting and calcination​

Answer 1

Answer

Calcination  

1. Calcination is a process in which ore is heated in the absence of air or air might be supplied in limited quantity.
2. Calcination involves thermal decomposition of carbonate ores.
3. During calcination, moisture is driven out from an ore..

    4.Carbon dioxide is given out during calcination.

Roasting

1. Roasting involves heating of ore lower than its melting point in the presence of air or oxygen.
2. Roasting is carried out mostly for sulfide minerals.
3. Roasting does not involve dehydrating an ore.

    4.During roasting large amount of toxic, metallic and acidic compounds are released.

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Answer 2

Answer:

Roasting is the process of heating ore to a temperature below its melting point while in the presence of air or oxygen. Calcination is the process of thermally decomposing carbonate ores. Roasting is mostly used to extract sulphide minerals. Moisture is pushed out of an ore during calcination.