Question

Give reasons for the following: Roasting the ore generally results in evolution of sulphur dioxide gas, while calcination of the ore evolves carbon dioxide gas.

  • Metallurgy
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Answer

Generally, sulphide ores are roasted, so SO2 is given off. Calcination is carried on carbonates and hydrated ores , so CO2 or water vapours is given off.

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Give reasons for the following pertaining to Hall Herault’s process.
(i) The fusion temperature of the electrolyte has to be lowered before conducting the electrolytic reduction.
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