Iovlieva Y. Ceramic spinel-type pigments with the use of slag aluminothermal production of ferrotitanium

The dissertation is devoted to the development of scientific base of new compositions technology of blue-green colors spinel ceramic pigments at low temperatures with the use of slag aluminothermal production of ferrotitanium. Experimental studies have established the general laws of the quantitative relationship between the optical color datas, chemical composition and temperature of roasting compositions in the system CaO - Al2O3 - TiO2 when used as a chromophore of cobalt and chromium oxides. It has been shown the efficiency of introducing the components of system of APF slag, which allows for the formation of cobalt blue color compositions in terms of enriched Al2O3 (70,0 wt.% or more). The possibility of using slag aluminothermal production of ferrotitanium for the obtaining ceramic pigments containing solid solution as the main crystalline phase between magnesium and cobalt-aluminate spinel has been revealed. The optimal concentration of cobalt oxide within drossy pigments (14,2-20,6 wt. %) which allows to reach an intense blue color glaze layer and the high quality of its surface was set. It has been found that the introduction of an additional pigment blends of chromium oxide contributes to blue-green color pigment, the later is caused by different ratios between aluminum and chrome spinel in a single solid solution (Co, Mg)(Cr, Al)2O4. The technological scheme of ceramic pigments of a blue-green range spinel type on the basis of slag APF taking into account the peculiarities of its preparation has been proposed. Successful production testing of the synthesized pigments in the fritted glazes for ceramic tiles and glass enamel on steel products for household use have been carried out.