Flue gas desulfurization gypsum (FGD)

Flue gas desulfurization gypsum (FGD) is the by-product of desulphurization of burnt gas with the wet limestone washing method. Main component is calcium sulphate dihydrate (CaSO4 . 2H2O), and therefore the FGD gypsum is used as a substitution for natural FGD gypsum

FGD gypsum produced by ČEZ, a.s. conform to the following requirements of quality:


Content of CaSO4 . 2 H2O

min. 90 % of weight


max. 10 % of weight

Amount of chloride

max. 0,1 % of weight

Amount of magnesium oxide

max. 0,2 % of weight

pH value

5 - 8

Weight activity Ra 226

max. 300 Bq/kg

Mass activity coefficient I

max. 2,0


FGD gypsum can be used as material for the following production: 

  • Cement
  • FGD gypsum plaster boards or gypsum fibre boards
  • Self-levelling floor compounds on gypsum basis
    • Anhydrite floor compounds
    • Floor compounds on the basis of alpha gypsum
  • Hard plasters
  • Porous concrete 
  • FGD gypsum blocks
  • Special fertilizers with suplphur
  • Substrate for the production of champignons

Links to particular power stations which possess valid certificates for the use of FGD gypsum :

Flue gas desulfurization gypsum (FGD) - unrefined (unwashed) :

Washed flue gas desulfurization gypsum (FGD): 
Washed FGD gypsum is used for a production with higher demand on the fineness of raw material, (contains CaSO4 . 2 H2O min. 95 % of weight, contains chloride max. 0,01 %).

These include e.g. production of gypsum and gypsum related products, i.e. gypsum plasterboards or FGD gypsum fibre boards, self-levelling floor compounds, plaster and the production of fertilizers.

Power plant is stored in waste sites or halls.

Filing sites: 
Place of consumption to auto-silos – EPR, EPC, EME, ELE, EDE