2007, Volume 9, Issue 1
Strategic Study of CAE >> 2007, Volume 9, Issue 1
Fundamental Research on Vanadium Recovering from V-bearingSteelmaking Slag
1. Anhui Provincial Key Laboratory for Metallurgical Engineering & Resources Recycling, Anhui University of Technology, Maanshan, Anhui 243002, China ;
2. Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China
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Abstract
The enrichment of vanadium and crystallization and growth of V-concentrating phase in V-bearing steelmaking slag are studied by adding SiO2 and Al2O3 with the method of melting-cooling. The results show that when15% SiO2 and 20% Al2O3 are added in slag, respectively, vanadium can be enriched in solid solution of Ca3[(V,P,Si)]O4]2 from the original phases of 2CaO·SiO2(C2S) and 2CaO·Fe2O3(C2F). The contents of V2O5 in Ca3[(V,P,Si)]O4]2 reach 24.38% and 14.90%, respectively. It is demonstrated that when the slag is added by Al2O3, V-concentrating phase can nucleates homogeneously at1325℃and heterogeneously at 1350℃. When holding at crystallization temperature of 1300℃, the crystals of V-concentrating phase grow from mean diameter of 6.28μm for 5min to 25.19μm for 580 min, and the number of crystals per unit area is decreasing.
Keywords
V-bearing steel slag ; enrichment ; V-concentrating phase ; crystal growth ; solid solution
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