The Investigation on the Microstructure of Metallurgical Molten Slags and the Foundation of the Primary Cluster Theory

• Published in: Steel research international 2005-10, Vol.76 (10), p.746-751
• Main Authors: Jiang, Guo Chang, Wu, Yong Quan, You, Jing Lin, Chen, Hui, Xu, Kuang Di
• Format: Article
• Language: English
• Subjects: CEMS model; Clusters; high temperature Raman spectra; Iron and steel making; Mathematical models; Metallurgical analysis; Metallurgy; Silicon dioxide; SiOT model; Si‐O tetrahedra; Slags; Ultraviolet
• ISSN: 1611-3683; 1869-344X
• DOI: 10.1002/srin.200506091

This paper presents the characteristics of the properties of metallurgical molten slags based on the bond structure or the existence of certain ion clusters. Some experimental and theoretical approaches were adopted in the investigation. Two sets of high temperature Raman spectroscopy (HTRS) were established at Shanghai University; both can be successfully operated at 2000K or higher. One of them combines the accumulated time resolution together with the spatial resolution, and it is designed for both ultraviolet (UV) and visible (VIS) light. The SiOT model uses 5 kinds of Si‐O tetrahedra (Qn) as microsturctural units. In this model, each sample contains 250000 or more tetrahedra. The calculation using a GF matrix and electro‐optical parameter (EOP) methods were performed for every tetrahedron one by one to determine the partial Raman spectra of Qn. Then the spectra were integrated to obtain an envelope of the sample. In addition to the SiOT model, a CEMS model was also developed to link the ion cluster structure and the thermodynamic properties at equilibrium (as mixing free energy).