First slide

Uses of Boron & Aluminium

Question

The process used for purification of bauxite ore containing high silica content as impurity is

Moderate

A

Baeyer’s process
B

Hall’s process
C

Hoope’s process
D

Serpek’s process

Solution

SERPEK'S PROCESS :
The process is used for the bauxite ore which contain silica as major impurity [which is called white bauxite].
The powdered bauxite ore is mixed with carbon and heated at high temperature in the presence of N₂ gas ,during this process AlN,CO and H₂O are formed.
Hydrolysis of AlN produces Al(OH)₃ and NH₃ ,Al(OH)₃on strong heating produces pure Al₂O_3.
$\large I)\,A{l_2}{O_3} + 3C + {N_2} \to 2Al{N_{(s)}} + 3CO \uparrow$
$\large Si{O_2} + 2C \to Si \uparrow + 2CO \uparrow$
$\large II)\,AlN + NaOH + 3{H_2}O \to Na[Al{(OH)_4}] + N{H_3} \uparrow$
$\large Na[Al{(OH)_4}] \to Al{(OH)_3} \downarrow + NaOH$
$\large Al{(OH)_3}\xrightarrow{\Delta }\mathop {A{l_2}{O_3}}\limits_{pure\,form} + 3{H_2}O$

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