摘要 The effect of Al2O3/SiO2 mass ratio and CaO content on the viscosity and structure of the CaO–Al2O3–SiO2–6MgO– 1.5ZrO2–1.5CeO2 slag was investigated. The results show that with the increase in Al2O3/SiO2 mass ratio, the viscous flow units within the slag gradually change from Si–O–Si to Al–O–Al and Al–O–Si. Furthermore, the substitution of Al2O3 for SiO2 leads to the transformation of Si–O bonds towards weaker Al–O bonds, which weaken the bond strength of the aluminosilicate networks, thus leading to a decrease in the viscosity of slag. The increase in CaO content effectively promotes the depolymerization of the aluminosilicate networks, resulting in a significant decrease in the viscosity of the slag. The slag with Al2O3/SiO2 of 0.7–1.5 and CaO of 30 wt.% shows promise as the reference slag system for the Fe-collection smelting of spent automotive catalysts due to its good comprehensive performance.
Abstract：The effect of Al2O3/SiO2 mass ratio and CaO content on the viscosity and structure of the CaO–Al2O3–SiO2–6MgO– 1.5ZrO2–1.5CeO2 slag was investigated. The results show that with the increase in Al2O3/SiO2 mass ratio, the viscous flow units within the slag gradually change from Si–O–Si to Al–O–Al and Al–O–Si. Furthermore, the substitution of Al2O3 for SiO2 leads to the transformation of Si–O bonds towards weaker Al–O bonds, which weaken the bond strength of the aluminosilicate networks, thus leading to a decrease in the viscosity of slag. The increase in CaO content effectively promotes the depolymerization of the aluminosilicate networks, resulting in a significant decrease in the viscosity of the slag. The slag with Al2O3/SiO2 of 0.7–1.5 and CaO of 30 wt.% shows promise as the reference slag system for the Fe-collection smelting of spent automotive catalysts due to its good comprehensive performance.
Zhe Wang,Qi-long Wei,Cheng-bin Shi, et al. Effect of Al2O3/SiO2 mass ratio and CaO content on viscosity and structure of slag for pyrometallurgical processing of spent automotive catalysts[J]. Journal of Iron and Steel Research International, 2024, 31(3): 608-621.
2024, Vol. 31 
