等离子电弧炉熔融技术可有效处理垃圾焚烧后形成的危废飞灰与底渣,但存在底部钢水层过度消耗、重金属固化不完全等问题。采用FactSage 8.1热力学软件、Microsoft SQL Server 2012数据库技术和Visual Studio 2013开发工具,计算得到了灰...等离子电弧炉熔融技术可有效处理垃圾焚烧后形成的危废飞灰与底渣,但存在底部钢水层过度消耗、重金属固化不完全等问题。采用FactSage 8.1热力学软件、Microsoft SQL Server 2012数据库技术和Visual Studio 2013开发工具,计算得到了灰渣熔炼过程不同渣系的相图和物理性能,构建了灰渣等离子电弧炉熔融数据库与专家指导模型,为灰渣熔融过程提供渣系优选成分、加料和熔炼制度提供指导。实验结果表明,底渣熔融调渣后的四元渣系熔化温度降低了8.7%~12.8%,黏度在1300~1600℃缩减75.9%~87.2%,表面张力提升9.6%,显著改善了渣铁分离效果。在推荐的冶炼温度1500℃和低于30%的理论氧气量下,能有效降低铁层消耗、残炭反应完全并实现重金属的稳定固化。展开更多
To optimize the comprehensive utilization of vanadium titanomagnetite by direct reduction-smelting processes,it is essential to acquire titanium slag with a higher TiO_(2)content of 45–60 wt.%.A thermodynamic model w...To optimize the comprehensive utilization of vanadium titanomagnetite by direct reduction-smelting processes,it is essential to acquire titanium slag with a higher TiO_(2)content of 45–60 wt.%.A thermodynamic model was developed based on the ion and molecule coexistence theory,specifically targeting the CaO–SiO_(2)–Al_(2)O_(3)–MgO–TiO_(2)–V_(2)O_(3)–FeO slag system.The impact of slag composition on the smelting of vanadium titanomagnetite was assessed,and the thermodynamic model was utilized to identify the optimal high-titanium slag.The results revealed that increasing the basicity,MgO content,and FeO content within the slag effectively suppressed the reduction of titanium and silicon oxides.Furthermore,the calculated activity coefficient of TiO_(2)decreased with higher basicity,MgO,and FeO levels.While an increase in basicity significantly enhanced the reduction of vanadium oxides,the effects of MgO and FeO contents on vanadium oxide reduction were comparatively less significant.Notably,higher basicity and FeO content promoted the formation of calcium titanates,whereas an elevated MgO content favored the formation of magnesium titanates.The smelting results indicated that a lower V_(2)O_(3)content and higher TiO_(2)activity corresponded to a smaller titanium mass fraction in the iron alloy,while the opposite trend was observed for vanadium.展开更多
文摘等离子电弧炉熔融技术可有效处理垃圾焚烧后形成的危废飞灰与底渣,但存在底部钢水层过度消耗、重金属固化不完全等问题。采用FactSage 8.1热力学软件、Microsoft SQL Server 2012数据库技术和Visual Studio 2013开发工具,计算得到了灰渣熔炼过程不同渣系的相图和物理性能,构建了灰渣等离子电弧炉熔融数据库与专家指导模型,为灰渣熔融过程提供渣系优选成分、加料和熔炼制度提供指导。实验结果表明,底渣熔融调渣后的四元渣系熔化温度降低了8.7%~12.8%,黏度在1300~1600℃缩减75.9%~87.2%,表面张力提升9.6%,显著改善了渣铁分离效果。在推荐的冶炼温度1500℃和低于30%的理论氧气量下,能有效降低铁层消耗、残炭反应完全并实现重金属的稳定固化。
基金the National Natural Science Foundation of China on the project 52104345 were acknowledged.
文摘To optimize the comprehensive utilization of vanadium titanomagnetite by direct reduction-smelting processes,it is essential to acquire titanium slag with a higher TiO_(2)content of 45–60 wt.%.A thermodynamic model was developed based on the ion and molecule coexistence theory,specifically targeting the CaO–SiO_(2)–Al_(2)O_(3)–MgO–TiO_(2)–V_(2)O_(3)–FeO slag system.The impact of slag composition on the smelting of vanadium titanomagnetite was assessed,and the thermodynamic model was utilized to identify the optimal high-titanium slag.The results revealed that increasing the basicity,MgO content,and FeO content within the slag effectively suppressed the reduction of titanium and silicon oxides.Furthermore,the calculated activity coefficient of TiO_(2)decreased with higher basicity,MgO,and FeO levels.While an increase in basicity significantly enhanced the reduction of vanadium oxides,the effects of MgO and FeO contents on vanadium oxide reduction were comparatively less significant.Notably,higher basicity and FeO content promoted the formation of calcium titanates,whereas an elevated MgO content favored the formation of magnesium titanates.The smelting results indicated that a lower V_(2)O_(3)content and higher TiO_(2)activity corresponded to a smaller titanium mass fraction in the iron alloy,while the opposite trend was observed for vanadium.
