Aluminium Extraction Flashcards
1
Q
Name of aluminium ore?
A
Bauxite
2
Q
1st step?
A
Remove impurities
3
Q
2nd step?
A
Dissolve Bauxite in alkali (NaOH)
4
Q
What dissolves by adding the alkali?
A
Bauxite
5
Q
What is formed?
A
Sodium aluminate
NaAl(OH)2
6
Q
Step 3?
A
Dilute the sodium aluminate by adding water
7
Q
What is formed after adding water?
A
Al(OH)3 precipitates
8
Q
Step 4?
A
Heated to form Al2O3 + H2
9
Q
The product after heating is in what form?
A
Solid
10
Q
What is added to the solid electrolyte to make it melt at a lower temperature?
A
Cryolite
11
Q
Cathode and Anode are made of?
A
Carbon
12
Q
Placement of cathode and anode?
A
Cathode lines the walls and the anode are many and in normal form
13
Q
Why is carbon used and not platinum?
A
It’s expensive
14
Q
Why is anode replaced?
A
It burns away as it reacts with the products
15
Q
What is formed at anode?
A
Oxygen
