Carbonates

• Manufacture of lime:

  1. Obtained from the thermal decomposition of limestone in a lime kiln
  2. CaCO3 + heat →  CaO + CO2
  3. Slaked lime (Calcium Hydroxide): small amounts of water is slowly added to lime

  CaO + H2O → Ca(OH)2

  
• What are the uses of lime?

  • Neutralizing acidic industrial waste products e.g. flue gas desulfarization
  • Manufacture of steel
• What are the uses of slaked lime?

  • Neutralizing soil acidity levels
  • Production of sugar from sugar cane
• What are the uses of limestone?

  1. Making cement
  2. Making iron from iron ore
• How cement is made with limestone: strongly heat powdered limestone with clay in a kiln; add gypsum (calcium sulphate).