UDK 666.1.001.5 Исследования по стеклу
GRNTI 61.35 Технология производства силикатных и тугоплавких неметаллических материалов
OKSO 18.06.01 Химическая технология
BBK 35 Химическая технология. Химические производства
TBK 5017 Материаловедение
Recycling of large-tonnage industrial waste with the production of construction materials is very promising. Taking in-to account the high content of refractory components, it is reasonable to reduce the energy intensity of synthesis by intro-ducing fluxing additives of melts. In this article the influence of the most active class of melts - sodium-containing com-pounds - on sintering and melting of ash and slag wastes (ASW) from thermal power plants is considered. High-temperature synthesis of compositions containing ASW and different amounts of sodium-containing fines (Na2CO3, Na2B4O7, NaF, NaOH) was carried out. It is shown that the Na2O content is not a decisive characteristic in the evaluation of fluxing activi-ty. The most active fluxing agent Na2B4O7 is revealed, even small amounts of which provide sharp acceleration of sintering and melting. The tendency of ash and slag waste to "self-foaming" due to oxidation of residual carbon and formation of pores by released gases has been established. Change of propensity to foaming at introduction of various melts and param-eters of the obtained porous structure including dark gray foamed areas and sintered areas of brown color have been stud-ied.
silicate raw materials, flux, sintering, sodium, depolymerization
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