| Title |
α-Hemihydrate gypsum from flue gas desulphurization gypsum / |
| Another Title |
α pushidratis gipsas, gautas iš dūmų šalinant sierą. |
| Authors |
Leškevičienė, Violeta |
| DOI |
10.5755/j01.ms.19.2.4438 |
| Full Text |
|
| Is Part of |
Materials science = Medžiagotyra.. Kaunas : KTU. 2013, vol. 19, no. 2, p. 197-202.. ISSN 1392-1320. eISSN 2029-7289 |
| Keywords [eng] |
flue gas desulphurization (FGD) gypsum ; α-hemihydrate gypsum ; calcium sulphate dihydrate ; dehydration ; hydration |
| Abstract [eng] |
In this work, properties of sulphate technogenic raw material – flue gas desulphurization (FGD) gypsum have been investigated in order to obtain α-hemihydrate gypsum as gypsum binding material. FGD gypsum is produced as a byproduct during the process of desulphurization of exhaust gas emitted in power stations heated by fuel containing sulphur. It has been determined that α-hemihydrate gypsum can be obtained from FGD gypsum under hydrothermal conditions at 125 °C and 130 °C. The compressive strength of gypsum samples is 13 MPa – 16 MPa after 2 h of hardening and it depends on temperature and time of isothermic curing. The compressive strength of the same samples in dry state is 49 MPa – 67 MPa. SEM analysis data showed that the properties of α-hemihydrate gypsum significantly depend on the shape and size of its crystals: when crystals have near form to regular hexagonal – shaped prism with length and width ratio approx. of 4 : 1, the gypsum exhibits the high quality mechanical and physical properties. |
| Published |
Kaunas : KTU |
| Type |
Journal article |
| Language |
English |
| Publication date |
2013 |
| CC license |
|
