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The Blast Furnace. Iron is extracted from its ore using carbon in a competition reaction. Raw Materials. Coke – carbon - C Limestone – calcium carbonate - Ca CO 3 Iron ore – iron (III) oxide - Fe 2 O 3. The Blast Furnace - diagram. Raw materials. Hot waste gases. Hot air. Molten iron.

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The Blast Furnace


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Presentation Transcript
the blast furnace

The Blast Furnace

Iron is extracted from its ore using carbon in a competition reaction

raw materials
Raw Materials
  • Coke – carbon - C
  • Limestone – calcium carbonate - Ca CO3
  • Iron ore – iron (III) oxide -Fe2O3
the blast furnace diagram
The Blast Furnace - diagram

Raw materials

Hot waste gases

Hot air

Molten iron

Slag

reactions in the blast furnace
Reactions in the Blast Furnace
  • Carbon + oxygen  carbon dioxide
  • C + O2  CO2
  • Carbon dioxide + carbon  carbon monoxide
  • CO2 + C  2CO
  • Iron (III) oxide + carbon monoxide  iron + carbon dioxide
  • Fe2O3 + 3CO  2Fe + 3CO2
formation of slag
Formation of slag
  • Thermal decomposition of limestone
  • Calcium carbonate  calcium oxide + carbon dioxide
  • Calcium oxide + silicon dioxide  calcium silicate
  • Calcium silicate is slag
waste products
Waste Products
  • Slag is used for road building
  • Hot waste gases are used to heat the air blasted in at the bottom of the furnace.
iron from the blast furnace

Iron from the blast furnace

is very brittle and has a limited number of uses. To make it more useful some of the carbon has to be removed. This is done when it is made into steel