Question
In Bayer’s leaching process, the siliceous impurities (SiO2) are filtered out immediately after leaching with NaOH – True or False?
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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:
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.
Was this answer helpful ?
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