Compaction of FGD-gypsum
article
It is shown that it is possible to produce compacted gypsum with a low porosity and a high strength on a laboratory scale by uniaxial compaction of flue gas desulphurization (FGD-) gypsum powder. Compacted FGD-gypsum cylinders were produced at a compaction pres-sure between 50 and 500 MPa yielding porosities after compaction between 21 and 6% and having a compressive strength between 20 and 96 MPa. Compaction of dry gypsum powder was not successful. It is necessary to add, dependent on compaction pressure, a few percent of water to achieve suitable density and strength properties. Notably the microstructure of compacted gypsum is completely different from that of cast gypsum. While cast gypsum con-sists of a network of intergrown fine acicular crystals, in compacted gypsum coarse granular crystals are aligned boundary-to-boundary without much intergrowth. Microstructural exa-minations showed that an increase in compaction pressure causes better boundary-to-boundary packing
TNO Identifier
329063
Source
ZKG International, 9(3), pp. 158-164.
Pages
158-164
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