Effect of Copper Slag on Viscosity of Slag Glass Melt and Crystallization Characteristics of Glass Ceramics
In order to prepare slag glass-ceramics through the synergistic utilization of multiple solid wastes,considering that the valence state and coordination of iron ions are significant parameters for altering the viscosity and structure of the glass melt,a study was carried out using fly ash and stainless steel slag as the fundamental raw materials,with copper slag serving as the primary source of Fe2O3.The impact of the quantity of copper slag on the glass viscosity and crystallization characteristics of glass-ceramics was explored.The results demonstrated that:① The Fe ions in copper slag exert a dominant regulatory influ-ence on the viscosity of the CaO-MgO-Al2O3-SiO2 slag glass melt,and the viscosity of the glass melt declines with the in-crease in the content of copper slag.The addition of copper slag not only disrupts the silicon-oxygen network structure of the glass melt but also reduces the flow activation energy of the melt.② When the addition amount of copper slag is 5%and 10%,the Fe ions in copper slag possess the function of a nucleating agent and promote pyroxene crystallization.With the further in-crease in the addition amount of copper slag,an excessive amount of Fe ions will induce the crystallization growth of magnetite and inhibit pyroxene crystallization.③ The synergistic utilization of stainless steel slag,fly ash and copper slag for the prepara-tion of slag glass-ceramics prompts the crystallization of Fe,Cr,Mg and O in solid wastes to form spinels.Spinels induce the epitaxial growth of pyroxene to form an encapsulation structure,effectively immobilizing heavy metal Cr ions in the slag glass-ceramics.
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