Extracting Iron Flashcards
1
Q
What is the iron ore used in a blast furnace
A
Haematite
Fe2O3
2
Q
What r the raw materials used in blast furnace
A
Iron ore
Coke pure carbon reducing iron oxide to iron metal
Limestone removes impurities in form of slag
3
Q
Reducing iron ore to iron
A
Hot air blasted in furnace making coke burn very quickly temp 1500 degrees
Coke burns produces CO2
C + O2 = CO2
CO2 reacts with unburnt coke to form CO
CO2 + C = 2CO
Carbon monoxide reduces iron ore to iron
3CO + Fe2O3 = 3CO2 + 2Fe
Iron molten very dense goes to bottom of furnace tapped off
4
Q
Removing impurities
A
Sand solid tends to stay w iron
Add limestone
Decomposed by heat
CaCO3 = CaO + CO2
CALCIUM oxide reaxts w sand to form slag calcium cilicate
CaO + SiO2 = CaSiO3
Tapped off cooled is solid used in
Road building fertiliser
