stion 6.
(a) What role does cryolite play in Hall Haraoult process?
(b) How can alumina be separated from silica in a bauxite ore
associated with silica? Give equations also.
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Answer:
(a)
Cryolite lowers the melting point of the ore and make it more conductive in nature so as to carry out electrolysis of the ore in Hall- Heroult process.
(b)
To separate alumina from silica in bauxite ore associated with silica, first the powdered ore is digested with a concentrated NaOH solution at 473 - 523 K and 35 - 36 bar pressure. This results in the leaching out of alumina (Al2O3) as sodium aluminate and silica (SiO2) as sodium silicate leaving the impurities behind.
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