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What is the role of cryolite in the metallurgy of aluminium?

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3 Answers

Cryolite (Na3AlF6) has two roles in the metallurgy of aluminium:
1. To decrease the melting point of the mixture from 2323 K to 1140 K.
2. To increase the electrical conductivity of Al2O3.

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To lower the melting point and increase conductivity of the mixture.

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The role of cryolite is two- fold:

  • It make alumina a good conductor of electricity.
  • It lowers the fusion (melting point) temperature of the both from 2323K to about 1140K.
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