Question

distinguish between roasting and calcination which of these two is used for sulphide Ores and why ​

Answer 1

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Roasting:

       It is the process in which sulphide ores of the metals are converted into oxides by heating them in the presence of excess air.

Calcination:

       It is the process in which carbonate ores of the metals are decomposed into oxides by heating them in the absence or limited air.

Roasting is used for sulphide ores.

Explanation:

Example for roasting : zinc sulphide is converted into zinc oxide by roasting.

Example for calcination : zinc carbonate is decomposed into zinc oxide and carbon dioxide by calcination.

Out of roasting and calcination, only roasting is used for sulphide ores. This is because it is easier to obtain metal from its oxide as compared to its sulphide.

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Answer 2

Answer:

Calcination: It is the process in which carbonate ores of the metals are decomposed into oxides by heating them in the absence or limited air. ... Out of roasting and calcination, only roasting is used for sulphide ores. This is because it is easier to obtain metal from its oxide as compared to its sulphide.