Question

during the extraction of aluminum..
c. Chemical reaction of transformation
of bauxite into alumina by Hall's
process.​

Answer 1

Answer:

c. In the Hall's process the bauxite is in powdered form and then leached by heating with aqueous sodium carbonate in the digester to form water soluble sodium aluminate. Then the insoluble impurities are filtered out. The filtrate is warmed and neutralised by passing carbon dioxide gas through it.

Explanation:

Answer 2

Answer:

In the Hall's process the bauxite is in powdered form and then leached by heating with aqueous sodium carbonate in the digester to form water soluble sodium aluminate. Then the insoluble impurities are filtered out. The filtrate is warmed and neutralised by passing carbon dioxide gas through it. This results in the precipitation of aluminium hydroxide.

AI2O3H2O (s) + Na2CO3 (aq) ➝ 2NaAIO (aq) +CO2 + 2H2O (l)

2NaAIO2 (aq) + 3H2O + CO2 (g) ➝ 2AI (OH)3 + Na2CO3

The precipitate of AI (OH)3 obtained in both, Bayer's and Hall's processes is filtered, washed, dried and then calcined by heating at 1000°C to obtain alumina.

2AI (OH)3 ➝ AI2O3 + 3H2O

Explanation:

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