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Question

Aluminum is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
Name a chemical used for dissolving aluminum oxide. In which state of sub-division is the chemical used?


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Solution

  • The chemical CryoliteNa3AlF6 is used to extract the AluminumAl from purified ore.
  • It acts as a solvent for dissolving pure Alumina or Aluminium oxide(Al2O3) because alumina has high thermal resistance so it does not melt easily.
  • So to decrease the melting point and increase the electrical conductivity, molten cryolite is added to alumina.
  • Fluorspar CaF2 is the other chemical that is used

Hence, the chemical used for dissolving Aluminum oxide is molten cryolite and fluorspar.


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