Relationship between thermophysical properties and structure of CMAS glass melts based on chromium slag

Abstract

In an attempt to determine the relationship among the network structure, viscosity, electrical conductivity, surface tension, and density of chromium-containing glass melts, the variation in glass melt thermophysical properties of the CaO-MgO-Al 2 O 3 -SiO 2 quaternary system were investigated by comprehensive physical property analysis and Raman spectroscopy. The results demonstrated that the network structural units Q n (n=0, 1, 2, 3) coexisted in the glass melts and their mutual transformation caused changes in the depolymerization degree, leading to a range of viscous activation energies, conductive activation energies, surface tension, and melt densities. Additionally, the logarithm of viscosity varied linearly with the logarithm of electrical conductivity (slope: 0.67-1.54). Meanwhile, the surface tension and melt density decreased with temperature. Consideration of these interrelations is indispensable during the development of chromium-containing slag glass ceramics, particularly for pilot and industrial applications.

Mirco-level Insight into the Surface Tension-structure Relationship of Molten CaO–MgO–SiO₂–Fe<i>_x</i>O–P₂O₅ Slags

“…Chengjun LIU, 1,2) Rui ZHANG, 1,2) Yifan MENG, 1,2) Zhen WANG, 1,2) Shiyan JIAO, 1,2) Jixiang JIA 3) and Yi MIN 1,2,3) * the attraction force between positive and negative ions and increase surface tension. Sukenaga et al 8) showed that the variation of oxygen atom environment is the main reason for the difference in the surface tension of the CaO-SiO 2 , CaO-SiO 2 -Al 2 O 3 and CaO-SiO 2 -Al 2 O 3 -MgO slags.…”

“…To control metallurgical behavior in smelting process, numerous studies on the surface tension of slag have been carried out. [3][4][5][6] Yuan et al 7) considered that cation potential (z/r) is closely related to surface tension, and a larger value of z/r in the SiO 2 -FeO-MgO-CaO system could enhance…”