Scientific Corner

Scientific Corner – What does C-a-S-O stands for?

Desulfurized gypsum is produced by FGD plant in removing sulphur dioxide in the flue gas from power plant. The plant works on the limestone-gypsum wet scrubbing principle with wastewater treatment. CaCO₂ + SO₂ > CaSO₄．½ H₂O. The limestone (CaCO₃) slurry reacts with Sulphur dioxide (SO₂) in the flue gas. The intermediate product (calcium sulphite, CaSO₃) is then further oxidized into gypsum (calcium sulphate, CaSO₄, 2H₂O). After a process of de-watering, desulfurized gypsum (CaSO₄．½ H₂O) is being produced for commercial use.