Research On The Compositions And Performance Of Low Energy Consumption Na₂O-CaO-SiO₂Glass

Glass industry in China has been a series of problems, such as high energy consumption, high environmental pollution and high production costs and so on. The most fundamental and most efficient way of reducing the energy consumption of the glass industry is to lower melting temperature of glass, but if reducing melting temperature of glass through the general method purely, which may lead to a change of various physical and chemical properties of glass, and even cause the decline of the performance of glass. In this situation, we need to put forward a method for optimizing the composition of glass fundamentally. Without lowering the related performance of glass, we should search for the most reasonable glass component for low melting temperature.Under the premise of compliancing with the melting, forming, annealing process requirement, by adJusting the CaO/SiO2, we prepare soda-lime-silicate flat glass for the lower melting temperature. Then the influence on the viscosity, melting temperature, structure and chemical stability of soda-lime-silicate glass with various Li2O and ZnO was investigated. The structure, thermal expansion, viscosity, melting temperature, workability and chemical durability of soda lime silcate glass with Li2O and ZnO were investigated by FT-IR, Raman spectroscopy, horizontal dual-rod dilatometer, rotating crucible viscometer, pH meter, optiacal and electronic microscopy. The results show that:With the increase of CaO/SiO2, the melting temperature Tm and the range of formation of glass gradually decreased, the activation energy for viscous flow Eη gradually increased; at the same time an appropriate increase in CaO/SiO2reduced the mass loss of soda-lime-silicate glass in deionzed water and alkaline solution, and improved the chemical stability of glass. The composition of glass (the ratio of CaO/SiO2is0.129) is more reasonable, the melting temperature of this glass is lower than the primitive glass’s10.1℃, water resistance is increased by2.6%, alkali resistance is increased by0.68%, and thermal expansion coefficients increased only0.207x10-7℃-1. With the increase of ZnO, the melting temperature Tm, the range of formation, the activation energy for viscous flow and thermal expansion coefficients of glass first decreased and then increased, at the same time the introduce of ZnO reduced the mass loss of soda-lime-silicate glass in deionzed water and alkaline solution, and improved the chemical stability of glass. The reasonable introduction of ZnO is4mol%, the melting temperature of this glass is lower than the primitive glass’s57.2℃, water resistance is increased by95.12%, alkali resistance is increased by22.37%, and thermal expansion coefficients decreased1.51x10-7℃-1.With the increase of Li2O, the melting temperature, Transition temperatures, Softening temperature and the activation energy for viscous flow of glass gradually decreased, the range of formation gradually increased, thermal expansion coefficient first decreased and then increased, at the same time the introduce of Li2O reduced the mass loss of soda-lime-silicate glass in deionzed water and alkaline solution, and improved the chemical stability of glass. The reasonable introduction of Li2O is0.8mol%, the melting temperature of this glass is lower than the primitive glass’s36.2℃, water resistance is increased by92.82%, alkali resistance is increased by17.91%, and thermal expansion coefficients decreased1.33x10-7℃The high temperature viscosity, energy consumption, refractory material cost of soda-lime-silicate glass with an appropriate increase in CaO/SiO2, introducing ZnO or Li2O can be reduced.