why is the electrolytic reduction of alumina a continuous process?
Answers
Answer:
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The electrolysis of pure alumina faces some difficulties. Pure alumina is a bad conductor of electricity. The fusion temperature of pure alumina is about 2000
∘
C and at this temperature when electrolysis is carried out on the fused mass, the metal formed vaporizes, as the boiling point of aluminium is 1800
∘
C. These difficulties are overcome by using a mixture containing alumina, cryolite (Na
3
.AlF
6
), and fluorspar (CaF
2
) which forms a melt with lower melting temperature.
Answer:
Electrolytic reduction of alumina is a - continuous Pure aluminium is produced at the cathode & being heavier than the electroly settles down. It is periodically removed through the outlet or tap hole at the bas As the concentration of Al2O3 falls-the resistance of the bath increases, indicated by ag on the control lamp. At this moment more alumina is added & the process contin
process.
'Al' obtained is almost 99.5% pure & can be further purified by - Hoope's proce