Effects of the Cr2O3 Content on the Viscosity of CaO-SiO2-10 Pct Al2O3-Cr2O3 Quaternary Slag

• Published in: Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2018-08, Vol.49 (4), p.1719-1731
• Main Authors: Wu, Tuo, Zhang, Yanling, Yuan, Fang, An, Zhuoqing
• Format: Article
• Language: English
• Subjects: Aluminum oxide; Basicity; Calcium oxide; Characterization and Evaluation of Materials; Chemistry and Materials Science; Chromium oxides; Materials Science; Metallic Materials; Nanotechnology; Silicon dioxide; Slag; Structural Materials; Surfaces and Interfaces; Thin Films; Viscosity; Viscous flow
• ISSN: 1073-5615; 1543-1916
• DOI: 10.1007/s11663-018-1258-z

The present study experimentally investigates the effect of Cr 2 O 3 on the viscosity of molten slags. The viscosities of CaO-SiO 2 -10 pct Al 2 O 3 -Cr 2 O 3 quaternary slags with two different binary basicities ( R , basic slag with R  = 1.2 and acidic slag with R  = 0.8) were measured by the rotating cylindrical method from 1813 K to 1953 K (1540 °C to 1680 °C). The results showed that the viscosity of both types of slag decreased as the Cr 2 O 3 content increased, but the viscosity of acidic slags exhibited a greater decrease. The slags showed good Newtonian behavior at such high temperatures. Cr 2 O 3 could act as a network modifier to simplify the Si-O-Si tetrahedral structure, as verified by the Raman spectral analysis, which was consistent with the decreasing trend of viscosity. The activation energy of viscous flow decreased slightly with increasing Cr 2 O 3 , but increasing the basicity seemed to be more effective in decreasing the viscosity than adding Cr 2 O 3 .