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The Blast Furnace

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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  1. The Blast Furnace Iron is extracted from its ore using carbon in a competition reaction

  2. Raw Materials • Coke – carbon - C • Limestone – calcium carbonate - Ca CO3 • Iron ore – iron (III) oxide -Fe2O3

  3. The Blast Furnace - diagram Raw materials Hot waste gases Hot air Molten iron Slag

  4. 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

  5. Formation of slag • Thermal decomposition of limestone • Calcium carbonate  calcium oxide + carbon dioxide • Calcium oxide + silicon dioxide  calcium silicate • Calcium silicate is slag

  6. 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.

  7. 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

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