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Guangyu Wang,Yongsheng Du,Jie Ma,Hongxia Zhang,Shunli Ouyang,Leibo Deng,Hua Chen,Ming Zhao 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.6
CaO-MgO-Al2O3-SiO2 glass-ceramics were successfully prepared using Baotou Steel BFS as the raw materials, choosing Fe2O3and Cr2O3 as nucleating agents. This paper focused on analyzing the combined effect of Fe2O3 and Cr2O3 on the structure andproperties of the glass-ceramics. Experimental results showed that the crystallization mechanism of glass-ceramics convertedsurface crystallization into bulk crystallization and the main crystalline phase of glass-ceramics changed gradually from augiteto diopside with the decrease of Fe2O3/Cr2O3 ratios. Therefore, an appropriate ratio of Fe2O3/Cr2O3 can act as nuclei forcrystallization of augite with integrated interlocking crystal structure and the physicochemical properties of glass-ceramic canbe improved. Consequently, the fracture mode of glass-ceramic was changed from intercrystalline to mixed transcrystalline/intercrystalline and therefore the average crack length can be shortened. Glass-ceramic with Fe2O3/Cr2O3 ratio of 1 had a highbending strength of 138.93 MPa, Vickers hardness of 7.51 GPa and acid resistance of 97.75%.
Preparation of decorative slag glass-ceramics and research on the solidification of heavy metals
Yang Tang,Xiaodong Hao,Zhenxiang Fang,Xinyu Bai,Guangyu Wang,Hongxia Zhang,Leibo Deng,Hua Chen,Ming Zhao,Yongsheng Du 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.1
Glass-ceramics with different CuO additions were prepared with Fe2O3 and Cr2O3 as composite nucleating agents, rare earthcontainingblast furnace slag (REBFS) as the main raw material. The existence state and stability of heavy metals Cu, Mn andCr in glass-ceramics were investigated. The results showed that Cr ions contributed to the generation of spinel phase, whileCu ions and Mn ions can enter the spinel crystal and exist stably, which indicated that there was a synergistic solidificationof Cu, Mn and Cr. The depolymerization effect of the copper ions contributed to the transformation of the crystal morphologyfrom dendrites to spherulites. Moreover, the increase in CuO contents promoted glass-ceramics from green to copper red. Based on the leaching experimental data analysis of heavy metals in glass-ceramics, the leaching concentration of heavy metalsCu, Cr and Mn were much lower than the standard leaching toxicity limit of hazardous waste (GB5085.3–2007, China). Theresults showed that the conversion of REBFS into environmentally friendly glass-ceramics can realize solid waste resourceutilization.
Yongsheng Du,Ying Wei,Zhicheng Zheng,Yuhang Guo,Hongxia Zhang,Leibo Deng,Hua Chen,Ming Zhao 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.2
In this paper, manganese-containing blast furnace slag (MBFS) was used as the main raw material and Cr2O3 was used asthe nucleating agent to prepare MBFS glass-ceramic by melting method. The influence of multiple heavy metal ions on thecrystallization characteristics, physical and chemical properties of glass-ceramic was studied by adding CuO and ZnO, and theexistence of multiple heavy metal ions in glass-ceramic and its curing effect were determined. The results showed that Cr wasthe key element for crystallization of glass-ceramic, which can enable volume crystallization to occur. The glass-ceramics withdiopside as the main crystalline phase had excellent comprehensive physical and chemical properties. The results of TCLPheavy metal leaching experiments also confirmed that spinel crystal wrapped by diopside and glass phase can produce anexcellent solidification effect on multiple heavy metals.