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.
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.
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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. (ii) The constituents of the electrolyte in addition to one part of fused alumina contains three parts of cryolite and one part of fluorspar. (iii) A layer of powdered coke sprinkled over the electrolytic mixture, protects the carbon electrodes. (iv) It is preferred to use a number of graphite electrodes as anode, instead of a single graphite electrode.
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