First slide

Uses of Boron & Aluminium

Question

The purification method used for mineral Al₂O₃.2H₂O is

Moderate

A

froth flotation
B

leaching
C

liquation
D

magnetic sparation

Solution

Leaching : It involves the treatment of the impure ore with a suitable reagent [NaOH] and make the reagent to react with ore and not with impurity or vice versa.
BAEYERS PROCESS
→ The red bauxite ore contains Fe₂O₃as impurity ,this impurity will not react with NaOH.
→Therefore when red bauxite ore is treated with NaOH it only reacts with Al₂O₃and converted to highly soluble NaAlO₂.
→ while Fe₂O₃donot react and seperated out as precipitate.This precipitate can be removed by filteration.
→ The above formed NaAlO₂ is diluted with water and converted to Al(OH)₃precipitate,on strong heating of Al(OH)₃
gives Al₂O₃(Bauxite) .
$\large A{l_2}{O_3} + 2NaOH \to \mathop {\mathop {2NaAl{O_2}}\limits_{sodium\,\,\,meta\,\,alu\min ate} }\limits_{So\operatorname{lub} le} + \,{H_2}O$
$\large NaAl{O_2} + 2{H_2}O \to Al{(OH)_3} \downarrow + NaOH$
$\large 2Al{(OH)_3}\xrightarrow{\Delta }A{l_2}{O_3} \downarrow + 3{H_2}O$

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