Question

Explain why in the electrolysis of alumina using the Hall Heroult’s process the electrolyte is covered with powdered coke.

  • Metallurgy
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Answer

The layer of powdered coke is sprinkled over the electrolytic mixture as :

  1. it prevents burning of carbon electrodes in air at the emergence point from the bath.
  2. it minimizes or prevents heat loss by radiation.

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Metallurgy

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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