Effect of B 2 O 3 Addition on Electrical Conductivity and Structural Roles of CaO-SiO 2 -B 2 O 3 Slag
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TRODUCTION
THE conductivity of slag has an important role in the molten oxide electrolysis process and can directly affect product quality and energy consumption. A large number of metals, including aluminum, magnesium, and titanium, have been produced by the electrolysis of molten slags and salts.[1,2] In recent years, the electrochemical nature of metallurgical reactions is receiving more attention; closely related to this is the electrical conductivity of the slag. Study of the electrical conductivity of the slag can help in understanding the transfer behaviors of oxygen ions and electrons in the slag and the electrochemical nature of reactions.
PAN ZHANG is with the Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China and also with the National Engineering Laboratory for Vacuum Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, P.R. China. JUNHAO LIU, ZHI WANG, and GUOYU QIAN are with the Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences. Contact e-mails: [email protected]; [email protected] WENHUI MA is with the National Engineering Laboratory for Vacuum Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology. Manuscript submitted July 8, 2018. Article published online January 2, 2019. 304—VOLUME 50B, FEBRUARY 2019
Electrical conductivity is also an important thermophysical property of a molten slag. This can provide not only a foundation for establishing a model, but also information regarding the structures of a slag. For instance, the earliest evidence for the ionic structure of oxide melts resulted from electrical conductance measurements.[3,4] The transport properties of silicate slags, such as conductivity and viscosity, are predominantly affected by their structure. Knowledge of the structure of silicate melts is an effective way to understand the conductivity properties of molten slags. There have been numerous attempts in the fields of metallurgy and glass science to measure these macroscopic thermophysical properties as a function of the composition of silicates based on a microscopic view of the structure.[5–17] Most attempts have studied the relationship between the structure and viscosity of a slag. Research on electrical conductivity relies on the relationship between composition and conductivity. In this study, the relationship between the structure and electrical conductivity of CaO-SiO2-B2O3 slag was investigated. CaO-SiO2-B2O3 slag has important significance for the smelting and refining processes of silicon metallurgy, so the study of its structure and macroscopic properties is useful. The macroscopic properties of these glasses and melts are primarily determined by their
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