Transcription of FGD GYPSUM
1 FGD GYPSUM . QUALITY CRITERIA AND ANALYSIS METHODS. GYPSE DE D SULFURATION. CRIT RES DE QUALIT ET M THODES D'ANALYSE. REA-GIPS. QUALIT TSKRITERIEN UND ANALYSENMETHODEN. QUALITY CRITERIA. For the product FGD GYPSUM QUALITY PARAMETERS EXPRESSED AS : UNIT QUALITY CRITERIA. Free moisture H2O % by weight < 10. Calcium sulphate dihydrate CaSO4 x 2H2O % by weight > 95(1). Magnesium salts, water MgO % by weight < 0,10. soluble Sodium salts, water soluble Na2O % by weight < 0,06. Chloride Cl % by weight < 0,01. Calcium sulphite hemihy- CaSO3 x 1/2 H2O % by weight < 0,50. drate pH 5 9. Ry Colour % white(2).
2 Lxaxbx Odour neutral Toxicity non toxic (1) The reduction of the calcium sulphate dihydrate content by inert constituents is not detrimental to the different areas of application. (2) Different colour values may apply depending on the use of the FGD GYPSUM and the final products. Analysis methods for the determination of the quality parameters of the Product FGD GYPSUM FGD GYPSUM quality parameters are determined in accordance with the VGB Instruction Sheet Analysis of FGD GYPSUM (VGB-M 701e, 2008). This instruction sheet is available from VGB PowerTech at: http://. Any analysis of water-soluble salts of sodium, magnesium, potassium and manganese (Na2O, MgO, K2O and MnO) is to be carried out with reference to the analytical methods for water-soluble magnesium salts decom- posed at boiling temperature (stock solution A2 according to VGB instruction sheet VGB-M 701e, 2008).
3 Toxic substances are determined in accordance with Beckert, J.; Einbrodt, H-J.; Fischer, M.: Comparison of Natural GYPSUM and FGD GYPSUM (1990) (Source: Bundesverband der Gipsindustrie , Berlin ( de) and VGB PowerTech , Essen ( )). It is also possible to use other analysis methods for the determination of the quality parameters in the product FGD GYPSUM provided they give results equivalent to those obtained with the reference methos. 2 I F G D G Y P S U M I G Y P S E D E D S U L F U R A T I O N I R E A - G I P S. Comments on the production of GYPSUM -based products FGD GYPSUM quality shall be such that it can be used for the production of GYPSUM -based products which are equivalent to those made from natural GYPSUM .
4 In principle, this is the case when the quality criteria mentioned above are complied with. FGD GYPSUM is therefore suitable, without any additional requirements, for the vast majority of the common uses of GYPSUM . However, there may be variations in some of the quality parameters mentioned in this document, if it can be ensured, in specific cases, that the GYPSUM blend intended for the manufacturing of the product in the GYPSUM factory complies overall with the requirements. Relevant quality parameters and analysis methods will be specified in the conditions of the contracts for the supply and reception of FGD GYPSUM .
5 Indications for the use of FGD GYPSUM in special areas of application When FGD GYPSUM is used in the specific areas of applications listed below, the following guidelines need to be followed to ensure the acceptable quality of GYPSUM products. These guidelines should not be considered as obligatory for achieving what is required but as recommenda- tions based on long-term knowledge and experience. 1. Efflorescence and discolourations For the unrestricted production of GYPSUM -based products sensitive to efflorescence, a content of water- soluble salts of magnesium (MgO), sodium (Na2O) and potassium (K2O) of below % is recommended.
6 Verification of the content of carbon, soot, fly ash as well as water-soluble salts of iron (Fe2O3) and manganese (MnO) is recommended in order to avoid various discolourations on visible surfaces. 2. Particle size / Crystal habit (particle size distribution). It is recommended to specify the particle size (for example, average diameter D50) and crystal habit (visual test by microscope) in the conditions for the supply and reception contracts for FGD GYPSUM . 3. GYPSUM Blocks When using FGD GYPSUM for the production of GYPSUM blocks in accordance with EN 13859, it can be used without any additional measures if the value of water-soluble MgO is below %.
7 4. Binders The content of carbonate shall be tested for the use of FGD GYPSUM for the production of binders based on alpha calcium sulfate hemihydrate or anhydrite. FGD GYPSUM with a CaCO3 content below % can be used without any additional measures. Q u a l i t y c r i te r i a a n d a n a l y s i s m e t h o d s I C r i t re s d e q u a l i t e t m t h o d e s d ' a n a l y s e I Q u a l i t t s k r i te r i e n u n d a n a l y s e n m e t h o d e n I 3. CRIT RES DE QUALIT . Pour le produit gypse de d sulfuration PARAM TRES DE. EXPRIM EN : UNIT CRIT RES DE QUALIT . QUALIT . Humidit libre H2O % en masse < 10.
8 Sulfate de calcium CaSO4 x 2H2O % en masse > 95 (1). dihydrat . Sels de magnesium, soluble MgO % en masse < 0,10. dans l'eau Sels de sodium, soluble Na2O % en masse < 0,06. dans l'eau Chlorure Cl % en masse < 0,01. Sulphite de calcium hemi- CaSO3 x 1/2 H2O % en masse < 0,50. hydrat . pH 5 9. Ry Couleur % blanc (2). Lxaxbx Odeur neutre Toxicit non toxique (1) La diminution de la teneur en sulphate de calcium par des constituants inertes n'est pas un inconv nient pour les diff rents domaines d'emploi. (2) Diff rentes couleurs sont possibles selon l'utilisation du gypse de d sulfuration et des produits finaux.
9 M thodes d'analyse pour la d termination des param tres de qualit . du Produit Gypse de D sulfuration Les param tres de qualit du gypse de d sulfuration sont d termin s selon le livret d'instruction du VGB. Analysis of FGD GYPSUM (VGB-M 701e, 2008). Ce livret est disponible chez VGB PowerTech sur: L'analyse des sels de sodium, magn sium, potassium et mangan se solubles dans l'eau (Na2O, MgO, K2O et MnO) doit tre r alis e suivant les m thodes d'analyse des sels de magn sium solubles dans l'eau d truits . temp rature d' bullition (solution A2 selon VGB instructions VGB-M 701e, 2008). Les substances toxiques sont d termin es selon Beckert, J.
10 ; Einbrodt, H-J.; Fischer, M.: Comparison of Natural GYPSUM and FGD GYPSUM (1990) (Source: Bundesverband der Gipsindustrie , Berlin ( ) and VGB PowerTech , Essen ( )). Il est galement possible d'utiliser d'autres m thodes d'analyse pour la d termination des param tres de qualit du produit gypse de d sulfuration si elles donnent des r sultats quivalents ceux obtenus par la m thode de r f rence. 4 I F G D G Y P S U M I G Y P S E D E D S U L F U R A T I O N I R E A - G I P S. Remarques concernant la production de produits base de gypse. La qualit du gypse de d sulfuration doit tre telle qu'il puisse tre utilis dans la fabrication de produits.
