Ceramics-Silikáty 49, (2) 115 - 119 (2005) |
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THE TREATMENT OF GYPSUM AS A PRODUCT OF THE FLUE GAS DESULPHURIZATION PROCESS
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Kostic-Pulek Aleksandra, Marinkovic Slobodanka, Popov Svetlana,
Djuricic Mirjana,
Djinovic Jasna
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Faculty of Mining and Geology, University of Belgrade, Djusina 7, 11000 Belgrade, Serbia and Montenegro
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Keywords: Alpha and beta hemihydrate, FGD gypsum, Hydrothermal method
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The modified hydrothermal method for the preparation of the alpha hemihydrate calcium sulphate was applied for the dehydration
of gypsum as a product of the flue gas desulphurization process with the gypsum/acid solution mixing ratios 0.125,
0.250, 0.500 and 0.750 g/cm³
. The obtained products were investigated by IR, DTA and microscopic analysis. The result of
analysis indicated complete reaction at different rates, in the first three suspensions (0.125 - 0.500 g/cm³
) giving a mixture of
the both (alpha and beta) hemihydrate forms. In the suspension with the ratio 0.750 g/cm³ the dehydration of gypsum was not
complete. The results showed that an increasing the gypsum/acid solution mixing ratio brings an increase of the fraction of
the superior alpha form in the final product, as well as an increase of the reaction rate and the average lengths of the alpha
hemihydrate single crystals. |
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