MetallurgyHard
Question
In the purification of aluminium by Hoope′s process, impurities of silicon and copper are added to molten aluminium in order to :
Options
A.make the melt conducting
B.lower the melting point of the melt
C.smooth deposit of aluminium
D.make the melt heavier
Solution
In Hoope′s electrolytic cell, there are three different layers of liquids; upper most layer of molten pure aluminium, middle one of the fluorides of Na+ , Ba2+ and Al3+ and bottom most layer of molten impure aluminium. To make the lower most layer heavier silicon and copper are added.
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