In Bayer’s leaching process, the siliceous impurities (SiO2) are filter

Discussion Forum : General Principles And Process Of Isolation Of Elements

Question -

In Bayer’s leaching process, the siliceous impurities $(S i O_{2})$ are filtered out immediately after leaching with NaOH – True or False?

Options:

A . True

B . False

C .

C u_{2} S

and FeS

D . Matte Copper

Answer: Option B
:
B

Red Bauxite contains $A l_{2} O_{3} .2 H_{2} O$ $+ F e_{2} O_{3}$ (major impurity) + $S i O_{2}$ $+ T i O_{2}$

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

Note that only $T i O_{2}$ and $F e_{2} O_{3}$ are filtered out.

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