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
Humidity	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

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

Flue gas desulfurization gypsum (FGD) - unrefined (unwashed) :
EDE, ECH, EPR II

Washed flue gas desulfurization gypsum (FGD): 
EME, EPC, EPR I
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.

Storage:
Power plant is stored in waste sites or halls.

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