首页|Effect of Al2O3/SiO2 mass ratio and CaO content on viscosity and structure of slag for pyrometallurgical processing of spent automotive catalysts
Effect of Al2O3/SiO2 mass ratio and CaO content on viscosity and structure of slag for pyrometallurgical processing of spent automotive catalysts
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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.
Aluminosilicate slagAl2O3/SiO2 mass ratioCaO contentViscositySlag structure
Zhe Wang、Qi-long Wei、Cheng-bin Shi、Zhan-cheng Guo
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State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China
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