Iron extract

• Iron extract

  
• Solubility rules

  
• starting material blast furnace

  iron ore, coke, limestone, air
• how remove silicon(iv) oxide


  thermal decomp - calcium carbonate / limestone

  caCo3 <-> CaO + Co2

  
  

  2. Calcium oxide remove silicon(iv) oxide

  1. CaO + SiO2 -> CaSiO3

  2. -> calcium silicate (slag)

  acid base reaction
• process iron extract

  • hematite (iron oxide) + Coke + limestone (calcium carbonate)
  • --- make reducing agent :
  • burn - Coke + O2 -> CO2 (exo, high tmp)
  • reduce - CO2 + carbon -> 2CO

  CO2 reduce hematite to iron

  • Fe2O3 + 3CO -> 2Fe + 3CO2
  • at high tmp: + 3C -> 2Fe + 3CO