Carbonate-silicate fillers precipitated from solutions of alkaline silicates and calcium hydroxide using carbon dioxide
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Poznan University of Technology
Publication date: 2003-01-01
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Teofil Jesionowski   

Poznan University of Technology, Institute of Chemical Technology and Engineering, Pl. M. Sklodowskiej-Curie 2, 60-965 Poznan, Poland
Physicochem. Probl. Miner. Process. 2003;37(1):123-130
A procedure was worked out to precipitate highly dispersed carbonate-silicate fillers using solutions of sodium metasilicate, calcium hydroxide and gaseous carbon dioxide. In course of fillers precipitation effects of changes of Na2SiO3:Ca(OH)2 solutions v/v ratios and temperature were examined. The precipitated fillers were subjected to a comprehensive physicochemical analysis (bulk density, capacities to absorb water, dibutyl phthalate and paraffin oil, flow-off point were estimated). Also particle size and particle size distribution, homogeneity of particles, their tendency to form agglomerates and particle surface morphology were examined using SEM and DLS techniques. Carbonate-silicate fillers were evaluated also in respect to their structure by means of WAXS method. Carbonate-silicate filler precipitated at the Na2SiO3:Ca(OH)2 v/v ratio=4:1 characterized high particles homogeneity, high values of paraffin oil absorbing capacity and flow off point, as well as low bulk density.
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