Extracting Iron Flashcards Preview

GCSE Chemisty*** > Extracting Iron > Flashcards

Flashcards in Extracting Iron Deck (11):
1

What is the main iron ore

Haematite Fe2O3

2

What is the reaction that occurs in the blast furnace

Reduction as there is the removal of oxygen

3

What are the raw materials

- iron ore
- coke used for reducing the iron ore
- limestone takes away a impurities

4

Step 1 in reducing iron ore

The coke burns and produces CO2

• C + O2 ——>> CO2

5

Step 2 of the reduction of iron ore

The CO2 then reacts with the unburnt coke to form carbon monoxide

• CO2 + C ——>> 2CO

6

Step 3 in the reduction of iron ore

The carbon monoxide the reduces the iron ore to iron

• 3CO + Fe2O3 ——> 3CO2 + 2Fe

7

What is the main impurity

Sand, silicon dioxide

8

Why is the limestone needed

The silicon dioxide would still be solid at 1500c and would stay mixed into the molten iron

9

Step 1 or removing impurities

The limestone is decomposed by the heat into calcium oxide and CO2

• CaCO3 ——>> CaO + CO2

10

Step 2 in removing the impurities

The calcium oxide then reacts with the silicon dioxide to form calcium silicate or slag

• CaO + SiO2 ——>> CaSiO3

11

What is the cooled slag used for

- road building
- fertilisers