EXTRACTION OF IRON Flashcards
Why don’t we use electrolysis for the extraction of iron?
Because Iron is less reactive than carbon so can be reduced.
What is the ore of iron.
Hematite.
Where does the extraction of iron occur?
In a blast furnace.
What are the 4 raw material needed for the extraction of iron?
1) Ore
2) Coke (Carbon)
3) Limestone (Calcium Carbonate)
4) Air
Which settles in the bottom, molten Iron or slag? Why?
Molten iron is more dense so it settles in the bottom.
What is the first reaction that takes place during the extraction?
C (s) + O2 (l) —-> CO2 (g)
Carbon (coke) reacts with oxygen to form carbondioxie
What type of reaction is this?
C (s) + O2 (l) —-> CO2
An exothermic reaction which increases the temperature of the blast furnace.
What is the second reaction that takes place?
CO2 (g) + C (s) —-> 2CO (g)
Carbon dioxide reacts with more carbon to form Carbon monoxide.
What type is this reaction?
CO2 (g) + C (s) —-> 2CO (g)
Endothermic reaction
What is the third reaction that takes place?
Fe2O3 (s) + 3CO (g) —-> 2Fe (l) + 3CO2 (g)
Carbon monoxide reduces the iron oxide (iron ore) to make molten iron.
What undergoes reduction and what undergoes oxidation in the following reaction:
Fe2O3 (s) + 3CO (g) —-> 2Fe (l) + 3CO2 (g)
Reduction: Fe2O3
Oxidation: CO
What is the name of this reaction?
Fe2O3 (s) + 3CO (g) —-> 2Fe (l) + 3CO2 (g)
Redox reaction
What happens to limestone?
It breaks down thermally to form lime and carbon dioxide.
CaCO3 —-> CaO + CO2
What is the name of this reaction?
CaCO3 —-> CaO + CO2
Thermal decomposition
What does lime do?
It reacts with impurities such as silicon dioxide (sand) to form slag (Calcium silicate)
CaO + SiO2 —-> CaSiO3
