Mechanochemical Activation of Mixtures for Low-Melting Glasses Production

Chemical Product Design and Engineering (CPD&E)

Chemical Product Design & Engineering - Poster (CPD&E - P)

MSc Milica Vlahovic
Institute for Technology of Nuclear and Other Mineral Raw Materials
Dpt. of Chemical Engineering and Metallurgy
86 Franchet d’Esperey St.,11 000 Belgrade
Serbia

MSc Sanja Martinovic
Institute for Technology of Nuclear and Other Mineral Raw aterials
of Metallurgy and Chemical Engineering
86 Franchet d'Esperey St.
11000 Belgrade
Serbia

PhD Predrag Jovanic
Institute for Plant Protection and Environmenat
Dpt. of Phytopharmacy
9 Teodora Drajzera St., 11000 Belgrade
Serbia

Ing Tamara Boljanac
Institute for Technology of Nuclear and Other Mineral Raw Materials
Dpt. of Chemical Engineering and Metallurgy
86 Franchet d’Esperey St., Belgrade
Serbia

PhD Velislav Vidojkovic
Institute for Technology of Nuclear and Other Mineral Raw Materials
Dpt. of Chemical Engineering and Metallurgy
86 Franchet d’Esperey St., 11000 Belgrade
Serbia

Keywords: mechanochemical activation, low-melting glass, DTA

Mechanochemical activation in high-energy devices (micronizers) as a way of giving mechanical energy to solid-state materials has become very popular. During the mechanochemical activation various structural changes of material and at the same time changes of its properties (chemical, electrical, thermal, mechanical etc.), as well as reactivity increase are taking place. Whereas numerous chemical reactions are happening during the glass production, investigating of the influence of previous mechanochemical treatment on those reactions and on the glass production at once is very attractive. Because of the great interest for low-melting glasses, PbO-B2O3-SiO2 system, with the following chemical composition: 40 mol% (69.4 wt %) of PbO, 34% (18.4 wt %) of B2O3 and 26 mol% (12.2 wt %) of SiO2, was chosen for investigation in this research. Raw materials used in the experimental work were minium (Pb3O4), boric acid (H3BO3) and quartz sand (SiO2). Five glass mixtures were prepared. The referent glass mixture was not mechanochemically activated. Other four glass mixtures were mechanochemically activated. Mechanochemical activation was performed in high-energy vibro mill with rings. Four time periods of mechanochemical activation were selected: 7min, 14min, 28min and 49min. The referent glass mixture and mechanochemically activated glass mixtures were subjected to differential thermal analysis (DTA). Applied method for the quantification of mechanochemical activation results showed that the effects of mechanochemical activation on the properties of glass mixtures for obtaining low-melting glasses were considerable. Mechanochemical activation had a significant influence on temperature changes in the investigated system, during heating. Differential thermal analysis showed the existence of qualitative changes in thermal properties of prepared glass mixtures depending on the time period.

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Presented Wednesday 19, 13:30 to 15:00, in session Chemical Product Design & Engineering - Poster (CPD&E - P).