Question -
In Bayer’s leaching process, the siliceous impurities (SiO2) are filtered out immediately after leaching with NaOH – True or False?
Options:
A .  True
B .  False
C .  Cu2S and FeS
D .  Matte Copper
Answer: Option B : B 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 150∘C where Note that only TiO2 and Fe2O3 are filtered out.
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