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

Question:

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

Solution:

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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