Blast Furnace Flashcards
1
Q
What does the haematite contain?
A
The iron.
2
Q
What is coke?
A
Pure carbon.
3
Q
What is the coke needed for?
A
Reducing the iron oxide to iron metal.
4
Q
What is the limestone used for?
A
Takes away the impurities in the form of slag.
5
Q
When coke burns what is the equation?
A
C + O2 -> CO2
6
Q
What is the equation when carbon monoxide reduces the iron ore to iron?
A
3CO + Fe2O3 -> 3CO2 + 2Fe
7
Q
What is the main impurity?
A
Sand (silicon dioxide)
8
Q
How is the molten slag formed?
A
The limestone decomposes by the heat into calcium oxide and CO2. The calcium oxide then reacts with the sand to form calcium silicate, or slag, which can be taped off.
9
Q
What can the cooled slag be used for?
A
Road-building, fertiliser.
