TY - JOUR
T1 - Effect of Al2O3 on the Viscosity and Structure of CaO-SiO2-MgO-Al2O3-FetO Slags
AU - Wang, Zhanjun
AU - Sun, Yongqi
AU - Sridhar, Seetharaman
AU - Zhang, Mei
AU - Guo, Min
AU - Zhang, Zuotai
N1 - Funding Information:
Supports by the National High Technology Research and Development Program of China (863 Program, 2012AA06A114), the Key Projects in the National Science & Technology Pillar Program (2013BAC14B07), and the National Natural Science Foundation of China (51472007, 51272005 and 5172001) are acknowledged.
Publisher Copyright:
© 2015, The Minerals, Metals & Materials Society and ASM International.
PY - 2015/2/11
Y1 - 2015/2/11
N2 - The present paper provided a fundamental investigation on the effect of Al2O3 on the viscosity and structure of CaO-SiO2-MgO-Al2O3-FetO slags for the purpose of efficiently recycling the valuable elements from the steelmaking slags. The results show that the viscosity of CaO-SiO2-Al2O3-MgO-FetO slags slightly increases with increasing Al2O3 content. The degree of the polymerization (DOP) of quenched slags, determined from Raman spectra and magic angle spinning–nuclear magnetic resonance, is also found to increase with increasing Al2O3 content. It can be deduced that the increasing DOP can promote the formation of gehlenite phase (Ca2Al2SiO7), thus facilitating the formation of higher phosphorous (or vanadium) contained solid solution (n′Ca2SiO4·Ca3((P or V)O4)2). As Al2O3 content increases up to a specific value, the charge compensating ions which present near [AlO4]-tetrahedra and [FeO4]-tetrahedra are not fully supplied due to the scarcity of Ca2+. In this case, the existing Fe3+ in the melt cannot completely form [FeO4]-tetrahedra and part of Fe3+ would form [FeO6]-octahedra to substitute Ca2+ to modify the slags.
AB - The present paper provided a fundamental investigation on the effect of Al2O3 on the viscosity and structure of CaO-SiO2-MgO-Al2O3-FetO slags for the purpose of efficiently recycling the valuable elements from the steelmaking slags. The results show that the viscosity of CaO-SiO2-Al2O3-MgO-FetO slags slightly increases with increasing Al2O3 content. The degree of the polymerization (DOP) of quenched slags, determined from Raman spectra and magic angle spinning–nuclear magnetic resonance, is also found to increase with increasing Al2O3 content. It can be deduced that the increasing DOP can promote the formation of gehlenite phase (Ca2Al2SiO7), thus facilitating the formation of higher phosphorous (or vanadium) contained solid solution (n′Ca2SiO4·Ca3((P or V)O4)2). As Al2O3 content increases up to a specific value, the charge compensating ions which present near [AlO4]-tetrahedra and [FeO4]-tetrahedra are not fully supplied due to the scarcity of Ca2+. In this case, the existing Fe3+ in the melt cannot completely form [FeO4]-tetrahedra and part of Fe3+ would form [FeO6]-octahedra to substitute Ca2+ to modify the slags.
UR - http://www.scopus.com/inward/record.url?scp=84939962174&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84939962174&partnerID=8YFLogxK
U2 - 10.1007/s11663-015-0303-4
DO - 10.1007/s11663-015-0303-4
M3 - Article
AN - SCOPUS:84939962174
SN - 1073-5615
VL - 46
SP - 537
EP - 541
JO - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
JF - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
IS - 2
ER -