ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 49, (2) 120 - 125 (2005)


INFLUENCE OF THE TECHNOLOGICAL PARAMETERS ON THE STRUCTURE AND PROPERTIES OF HEMI-HYDRATE PHOSPHOGYPSUM
 
Valancius Zeonas, Nizeviciene Dalia, Leskeviciene Violeta, Kybartiene Nora
 
Department of Silicate Technology, Faculty of Chemical Technology, Kaunas University of Technology Radvilenu str. 19, 50254 Kaunas, Lithuania

Keywords: Hemi-hydrate phosphogypsum, Apatite, Crystals, Physico-mechanical properties
 

Industrial way of the production of ortho-phosporic acid from apatite of various areas results in the waste product CaSO₄ ·0.5H₂O having different structure and properties. To study the effect of the technological parameters on the formation of hemi-hydrate phosphogypsum, laboratory experiments of the decomposition of Kola apatites with sulphuric acid have been carried out and the properties of hemi-hydrate phosphogypsum investigated. The regulation the technological parameters of decomposition makes possible to obtain hemi-hydrate calcium sulphate which is characterized by well pronounced crystal structure and by good binding and physical-mechanical properties without additional processing.


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