Study On Properties Of Glass Ceramics From Steel Slag And Modeling Application Of The Viscosity Of Silicate Melts

The glass-ceramics from steel slag have many advantages. The chemicalcomposition of this kind of glass-ceramics is very close to that of matrix glassfrom steel slag. A good material of high mechanical strength and chemicalinertness was obtained in this study, with a small amount of additives. With theflourishing development of all kinds of science, the methodology, technology, andtools of them tend to interfuse and infiltrate deeply. This makes it possible thatmaterials design and model analysis are introduced in the production process ofglass-ceramics. The key to solve the significant problem of solid waste treatmentis exertion the advantages of Environmental Engineering, and exploring theintegration of Environmental Engineering with materials science, computerscience, and architecture science et al..This paper provided a brief introduction to the research progress ofslag-derived glass-ceramics and the estimating model of viscosity, as well as theprocess of chemical composition and estimating principle of viscosity model usedin this research. Glass-ceramics from steel slag was prepared successfully withsintering process and composition designed, and the main crystalline phases werediopside and augite. The heat treatment schedule had significant effect oncrystallization and properties of specimens. The optimized nucleated temperatureand time were ultimately determined at770℃and1h, and the optimizedcrystallized temperature and time were determined at930℃and2h. Themorphology of the crystallization phase tended to be dendritic and granular fromspecimen with suitable thermal treatment. The compressive strength of specimenachieved was530Mpa, and the material also exhibited excellent corrosionresistance. Glass ceramics prepared was enough adequate for building materials.We optimized the parameters about FeO in the viscosity model, then tookthe check test of estimating for CaO-SiO₂-Al₂O₃-MgO-FeO system and its sub-systems, with viscosity model. The veracity of the model were validated, andthe model can be used in the study of viscosity and melting temperatures. It’sfound that viscosity increased with increasing content of Al₂O₃and SiO₂, anddecreased with increasing content of MgO. In addition, variation of content ofSiO₂and MgO had greater effects on the viscosity than content of Al₂O₃. Themelting temperature of matrix glass was at1400℃-1450℃, according to resultsof model.MSW fly ash was introduced to glass-ceramics as nucleating agent, and theeffect of additive amount of fly ash on the crystallization and mechanicalproperties were studied. The result suggests that the additive of fly ash will nothave obvious adversely affect on the compressive strength and the corrosionresistance with low content （such as3wt%,6wt%）. Variation of viscosity withcontens of fly ash were discussed. There was not significant impact on the linearrelationship between viscosity and temperature, but viscosity decreased withincreasing content of fly ash at a certain temperature, according to modelprediction. This have the double advantages of energy saving, efficiencyincreasing and environmental protection, because the melt temperature of glassprecursor not only could be effective reduced, but heavy metal elements in fly ashcould be fixed in the crystal lattice.