MetallurgyHardBloom L3

Question

The major role of fluorspar (CaF2) which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite (Na3AlF6) is

Options

A.as a catalyst
B.to make the fused mixture very conducting
C.to lower the melting temperature of the mixture
D.to decrease the rate of oxidation of carbon at the anode.

Solution

Sol. CaF2 + Na3AlF6 are added during electrolytic reduction of Aluminnium to lower to M.P. & to increase the conductivity.

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