TITLE

INFLUENCE OF THE SETTING ACTIVATORS ON THE PHYSICAL MECHANICAL PROPERTIES OF PHOSPHOANHYDRITE

AUTHOR(S)
LEŠKEVIČIENĖ, VIOLETA; NIZEVIČIENĖ, DALIA
PUB. DATE
April 2014
SOURCE
Chemical Industry & Chemical Engineering Quarterly;2014, Vol. 20 Issue 2, p233
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Phosphoanhydrite was obtained by processing dihydrate phosphogypsum generated during phosphoric acid production at Joint Stock Company (JSC), Lifosa (Lithuania). The influence on the properties of phosphoanhydrite of the treatment process parameters was determined, including: the conditions of phosphogypsum neutralisation in the lime suspension, temperature and duration of calcination of neutralized phosphogypsum to phosphoanhydrite, fineness of ground anhydrite, selection of additives activating the hydration of anhydrite and their amounts. Upon adding activators of anhydrite hydration, K2SO4 or Na2SO4, XRD and IR spectral analysis data show that the specimens, after 1 day of phosphoanhydrite hydration with additives, contained complex salts - syngenite upon using K2SO4 additive and glauberite in the case of Na2SO4 additive. These additives act as crystallization centers and accelerate hydration. It was determined that the specimens of phosphoanhydrite calcined at a temperature of 900 °C with 2% K2SO4 additive have the best physical and mechanical properties. Already after 1 day of hardening the specimens acquired a compressive strength of 21.18 MPa, and after 28 days of hardening they had a compressive strength of 58.5 MPa (dry specimens).
ACCESSION #
97003403

 

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