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What is the role of CO(2) in the extract...

What is the role of `CO_(2)` in the extractive metallurgy of aluminium from its ore ?

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The solution which now contains the oxides of aluminum and silicon are next treated by bubbling carbon dioxide gas through the solution . Carbon dioxide forms a weak acid solution of carbonic acid which neutralizes the sodium hydroxide from the first treatment . This neutralization selectively precipitates the aluminum oxide, but leaves the silicates in solution. Again filtration is used for the separation . After this stage the the purified aluminum oxide is heated to evaporate the water.
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