What happens in the Blast Furnace?

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i have a homework about the blast furnace and i haven't got a clue what happens inside it, help!

Posted Sun 8th April, 2012 @ 11:48 by Mel

2 Answers

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Iron is extracted from haematite and magnetite (different oxides of iron). This happens in a blast furnace. A blast furnace is roughly 50m high, and lined with heat–resistant bricks. The haematite (the ‘charge’) is loaded into the blast furnace, along with coke (heated coal) and limestone. A blast of hot air is sent through two tuyeres near the bottom of the furnace. This makes the haematite glow – as the coke burns in the heated air – C+O2 --> CO2 After this, a number of other reactions take place

  • Limestone decomposes–


  • The carbon dioxide reacts with more coke producing carbon monoxide t

CO2+C --> 2CO

  • Carbon monoxide is a reducing agent it reduces . It reduces the iron ore (temp. – 700o)

Fe2O3 + 3CO --> 2Fe + 3CO2

  • This molten iron falls to the bottom of the furnace
  • The calcium oxide reacts with impurities (acidic as it is alkaline) to form ****. The main impurity is silicon oxide, meaning that the **** is mainly calcium silicate.

CaO + SiO2--> CaSiO3

  • This **** also trickles to the bottom where it floats on top of the iron as it is less dense.
  • The iron is tapped off out of the furnace (as well as the ****)
  • Waste gases escape from the top of the furnace.
  • **** is used by builders and road makers for foundations.

Everything you need to know at GCSE xD 

Answered Sun 8th April, 2012 @ 11:58 by Bhavik
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O_0 bloody hell THIS at GCSE?what ?we didnt go into that much detail when i did it last year..

pretty usefull for AS chem2 though XD!

Thankyou :D

Answered Sun 15th April, 2012 @ 21:53 by RumZ