npk fertilisers

• npk fertilisers contain

  • nitrogen
  • phosphorus
  • pottasium
• nitrogen

  • use ammonium nitrate salt
  • you get ammonia from the haber process
  • use the ammonia to produce nitric acid ( oxidised )
  • then react the nitric acid with ammonia to produce the salt
• pottasium

  • use pottasiumchloride or pottasiumsulfate salts
  • mined
  • it is soluble
  • there is no need for chemical processing
• phosphorus

  1. using sulfuric acid
  2. treat phosphate rock with sulfuric acid to produce calciumphosphate and calcium sulfate
  3. this is single super phosphate
• phosphorus

  • using phosphoric acid
  • treat phosphate rock with phosphuric acid
  • this is triple super phosphate
• production of ammonium nitrate ( industrial )

  • ammonia will be a gas
  • nitric acid will be concentrated
  • because is exothermic alot of energy and heat will be releases
  • this heat will be used to evaporate and create crystals
  • it is a continuous process
• production of ammonium nitrate ( school )

  • ammonia and nitric acid will be dilute liquids
  • evaporated with a bunsen burner
  • small amounts will be produced
  • it is a batch process
• npk fertilisers are a formulations of salts
• phophorus

  1. using nitric acid
  2. treat phosphate rock with nitric acid to produce phosphuric acid
  3. the phosphuric acid cant be used direclty so ammonia is added to neutralise it