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Extraction of metals (Iron (Raw materials used (Air (Temperature is…

- - - - Carbon monoxide reduces the iron (III) oxide to iron
        
        Iron flows to the bottom of the furnace and is removed from time to time as a liquid
        
        The iron flows into moulds and is left to solidify
        
        Other reactions may take place where carbon reduces iron (III) oxide directly in the hotter parts of the furnace
    - - Carbon dioxide reacts with the coke to form carbon monoxide
    - - Heat from furnace decomposes limestone
        
        Calcium oxide formed reacts with silicon (IV) oxide to form a ‘slag’ of calcium silicate
        
        Liquid slag runs down and forms a layer on top of the liquid iron
        
        lower density than iron
        
        The slag is run off
        
        solid lag used as building material, particularly in road building
    - - Temperature is between 550 to 850 degrees
        
        to react with coke
      - At the bottom of the furnace, coke burns in the hot air blast to form carbon dioxide
        
        exothermic reaction
        
        heat released helps furnace
- - - - Crushed and treated
        
        remove waste rock and other impurities
        
        Roast (strongly heated) in air to form zinc oxide
    - - Zinc oxide is heated with coke in a blast furnace
    - - A blast of air is blown into the bottom of the furnace
        
        Excess carbon reacts with oxygen to form carbon monoxide
        
        Higher up the furnace, carbon monoxide reduces zinc oxide to zinc
        
        CO2 can react with more carbon to reform CO
        
        Some zinc oxide may react directly with the carbon
        
        The temperature in the furnace is higher than the boiling point of zinc
        
        zinc vapour is carried up through the furnace by the stream of CO and CO2
        
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