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Question

In Bayer’s leaching process, the siliceous impurities (SiO2) are filtered out immediately after leaching with NaOH – True or False?


A

True

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B

False

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Solution

The correct option is B

False


Red Bauxite contains Al2O3.2H2O +Fe2O3 (major impurity) + SiO2 +TiO2

After calcination, organic matter, volatile substances and moisture are removed. The calcine is then leached with 45 % NaOH solution at about 150C where

Note that only TiO2 and Fe2O3 are filtered out.


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