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Metallurgy — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryMetallurgy2 Marks
Question
Answer the following questions with respect to the electrolytic process in the extraction of aluminium:
(i) Identify the components of the electrolyte other than pure alumina and the role played by each.
(ii) Explain why powdered coke is sprinkled over the electrolytic mixture.
✓

Answer

(i) 1. Cryolite (Na3AlF6) : It increases the conductivity of mixture and lowers the m.p. of electrolyte from 2050°C to 950°C.
2. Fluorspar (CaF2) : It increases mobility of ions in the mixture as it acts as solvent for alumina and cryolite.
(ii) Powdered coke prevents (i) heat loss from the electrolyte (ii) burning of electrodes projecting out electrolyte.

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