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 compositi...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-eoordinated 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.展开更多
基金Item Sponsored by National Natural Science Foundation of China (50874013)National Key Technology Research and Development Programof China (2007BAB15B04)Program for New Century Excellent Talents in University of China(NCET-07-0071, NCET-08-0723)
文摘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-eoordinated 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.
