Question

I. State the reason for addition of caustic alkali to bauxite ore during purification of bauxite.

Answer 1

Caustic alkali dissolves aluminium oxide forming soluble sodium aluminate while impurities remain insoluble and precipitate as red mud.

Answer 2

Answer:

Bauxite is a rock formed from a reddish clay material called laterite soil and is most commonly found in tropical or subtropical regions. Bauxite is primarily comprised of aluminum oxide compounds (alumina), silica, iron oxides and titanium dioxide.