05. Blast Furnace

What are the raw materials in the blast furnace?

Iron ore (iron oxide), Coke (carbon), Limestone (calcium carbonate)

What is the first stage of the blast furnace?

Combustion

What happens in combustion?

Coke reacts with oxygen making carbon dioxide

What is hot air?

A source of oxygen

What happens at the second stage of the blast furnace?

Reduction and oxidation

What is the first thing that happens in reduction and oxidation?

Carbon dioxide reacts with coke to form carbon monoxide (reduction)

What is the second thing that happens in reduction and oxidation?

Carbon monoxide reacts with iron ore to make iron and carbon dioxide

What is the third step of the blast furnace?

Making slag

What is the first step in making slag?

Limestone decomposes and makes calcium oxide and calcium dioxide

What is the second step of making slag?

Calcium oxide reacts with impurities making slag (neutralisation)

What is the last step of the blast furnace?

Cost and environment

What happens in cost and environment?

CO2 produced (global warming), Expensive to run as needs lots of heat

What is oxidation?

Adding oxygen

What is reduction?

Losing oxygen