Question

In which process, hot air is used to purify the crude metal which is obtained by reduction of ore?​

Answer 1

Metal extraction is done by heating the ore with a regular supply of hot air in the furnace

This is done to encourage solid gas reactions between the ore and the air. Sulphide ores of elements such as zink are treated using the method.

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Answer 2

In roasting process, hot air is used to purify the crude metal obtained by the reduction of ore

• Metal extraction in roasting process is done by the supply of hot air in the furnace
• The supply of hot air encourages the reaction between the concentrarted ore and the air
• Roasting is generally used for sulphide ores of lead, copper and zinc to remove sulphur from the ore. Sulphur reacts with oxygen to form sulphur dioxide and escapes into the air