1
Q
What is hydraulic washing also called?
A
gravity seperation method
2
Q
Heavier ores are purified using which method?
A
Hydraulic washing
3
Q
Froth flotation is used for which ores?
A
Sulphide ores
4
Q
What is calcination?
A
It is the conversion of ores into their oxides by heating in the absence of below their melting points.
5
Q
How does calcination help?
A
It makes the ore more porous and in doing so increases surface area for further rxn.
6
Q
Just a note:
A
Fe2O3 can be reduced by coke above 1079K and by CO below that.
7
Q
What is smelting?
A
It is the reduction of metal oxides using coke.
8
Q
For what ores can calcination be used?
A
- Hydrated oxides
- oxides
- carbonates
- Basic carbonates
- hydroxide ores
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