1. Metallurgical and Ecological Engineering School, University of Science and Technology Beijing,Beijing 100083, China;2. College of Engineering, Peking University, Beijing 100871, China
Viscosities Behavior of CaO-SiO2-MgO-Al2O3 Slag With Low Mass Ratio of CaO to SiO2 and Wide Range of Al2O3 Content
1. Metallurgical and Ecological Engineering School, University of Science and Technology Beijing,Beijing 100083, China;2. College of Engineering, Peking University, Beijing 100871, China
ժҪ The present paper is aimed at recycling of coal ash and blast furnace slag to produce mineral wool. Considering the mineralogical constitutions of coal ash and blast furnace slag, the primary quaternary slag compositions of CaO-SiO2-MgO-Al2O3 with basicity (mass ratio of CaO to SiO2) ranging from 0��5 to 0��9 and alumina ranging from 5% to 20% were investigated through a rotating cylinder method. The experimental results indicated that the viscosities decreased with increasing basicity above the liquidus temperature, and increased with increasing alumina content, and the maximum values were reached and as the alumina content was 20%, followed by the decrease with further increasing alumina content due to its amphoteric behavior. The amphoteric behavior of Al2O3 also performed in the relationship between viscosity and non-bridging oxygen per tetrahedrally-coordinated atom (NBO/T), and the viscosities decreased with increasing the NBO/T except the slag with a basicity 0��5 and Al2O3 20% which have a low NBO/T value and a low viscosity than others.-
Abstract��The present paper is aimed at recycling of coal ash and blast furnace slag to produce mineral wool. Considering the mineralogical constitutions of coal ash and blast furnace slag, the primary quaternary slag compositions of CaO-SiO2-MgO-Al2O3 with basicity (mass ratio of CaO to SiO2) ranging from 0��5 to 0��9 and alumina ranging from 5% to 20% were investigated through a rotating cylinder method. The experimental results indicated that the viscosities decreased with increasing basicity above the liquidus temperature, and increased with increasing alumina content, and the maximum values were reached and as the alumina content was 20%, followed by the decrease with further increasing alumina content due to its amphoteric behavior. The amphoteric behavior of Al2O3 also performed in the relationship between viscosity and non-bridging oxygen per tetrahedrally-coordinated atom (NBO/T), and the viscosities decreased with increasing the NBO/T except the slag with a basicity 0��5 and Al2O3 20% which have a low NBO/T value and a low viscosity than others.-
TANG Xu-long,ZHANG Zuo-tai,GUO Min,ZHANG Mei,WANG Xi-dong. Viscosities Behavior of CaO-SiO2-MgO-Al2O3 Slag With Low Mass Ratio of CaO to SiO2 and Wide Range of Al2O3 Content[J]. �й������ڿ���, 2011, 18(2): 1-6.
TANG Xu-long,ZHANG Zuo-tai,GUO Min,ZHANG Mei,WANG Xi-dong. Viscosities Behavior of CaO-SiO2-MgO-Al2O3 Slag With Low Mass Ratio of CaO to SiO2 and Wide Range of Al2O3 Content. Chinese Journal of Iron and Steel, 2011, 18(2): 1-6.
2011, Vol. 18 
