how roasting is different from calcination explain the process and also write chemical reaction involved for each process
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(a) Roasting is a process in which the ores are heated to a temperature that is below its melting point. This happens in the presence of air in order to oxidize the impurities. They are usually removed as gaseous oxides.
Calcination is a process in which the ores are heated below its melting point in the absence of air. Volatile impurities like arsenic are removed by this process.
Roasting is the method used for sulphide ores. Roasting is used because it is easier to purify the oxides of a substance than the other ores. Therefore, sulphide ores are also heated strongly in the presence of excess oxygen to form its oxides.
(b) The example of equation illustrating the use of aluminum for joining cracked railway lines is depicted in the image.
(c) In the electrolytic refining of impure copper,
The anode used is – impure copper
The cathode used is – pure copper sheet
The electrolyte used is – a bath of copper sulphate (CuSO4) and sulphuric acid (H2SO4).
Calcination is a process in which the ores are heated below its melting point in the absence of air. Volatile impurities like arsenic are removed by this process.
Roasting is the method used for sulphide ores. Roasting is used because it is easier to purify the oxides of a substance than the other ores. Therefore, sulphide ores are also heated strongly in the presence of excess oxygen to form its oxides.
(b) The example of equation illustrating the use of aluminum for joining cracked railway lines is depicted in the image.
(c) In the electrolytic refining of impure copper,
The anode used is – impure copper
The cathode used is – pure copper sheet
The electrolyte used is – a bath of copper sulphate (CuSO4) and sulphuric acid (H2SO4).
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