With China’s strong emphasis on achieving ultra-low emissions in the steel industry,the precise desulfurization of blast furnace gas(BFG)has emerged as a critical research area.The complex composition of sulfides in ...With China’s strong emphasis on achieving ultra-low emissions in the steel industry,the precise desulfurization of blast furnace gas(BFG)has emerged as a critical research area.The complex composition of sulfides in blast furnace gas presents substantial challenges to the development of effective front-end desulfurization technologies.Given the close relationship among BFG desulfurization process design,equipment selection,and the speciation of sulfur compounds,the generation pathways and mechanisms of sulfides in BFG were investigated using the blast furnace charge structure as a foundation.A thermodynamic C–H_(2)–SO_(2) system was constructed with FactSage and substantiated through experimental studies.Results show that in the C–H_(2)–SO_(2) system when the molar fraction of H_(2) is not more than 1.0 mol and temperatures are below 1450℃,H_(2)S,COS,S_(2),and CS_(2) interconvert.Higher H_(2) levels suppress COS production,rendering COS unstable above 1000℃ and H_(2)S unstable above 1450℃.At temperatures exceeding 2000℃,CS_(2) and CS prevail as the primary sulfur-containing species,with trace amounts of H_(2)S and S_(2) present.Sulfur in BFG arises from two key pathways within the furnace.Initially,furnace materials in the upper zone release minor quantities of COS and H_(2)S.Subsequently,as bosh gas rises and cools through the cohesive zone,predominant sulfur compounds CS_(2) and S_(2) react intricately with CO,CO_(2),H_(2),CH_(4),and H_(2)O,yielding mainly organic sulfur COS and CS_(2) alongside small fractions of inorganic sulfur H_(2)S and SO_(2),which ultimately enter the top gas.展开更多
Steel rolling sludge,an oil-containing waste generated during steel production,was difficult to manage.Prolonged storage poses significant environmental and health hazards.Most steel enterprises in China use steel rol...Steel rolling sludge,an oil-containing waste generated during steel production,was difficult to manage.Prolonged storage poses significant environmental and health hazards.Most steel enterprises in China use steel rolling sludge directly as a raw material for sintering.However,its adhesive nature caused poor mixing with other materials,affecting the quality of the sinter.Herein,the incorporation of steel rolling sludge incineration slag into the sintering process was investigated for experimental purposes.The results indicated that adding 1%incinerated steel rolling sludge to the sintering raw material was feasible.At this proportion,both the yield and the tumbler index of the sinter have improved,primarily due to the oxidation reaction of Fe_(3)O_(4)present in the steel rolling sludge incineration slag during the sintering process,which significantly increases the sensible heat of the sinter and enhances the sintering mineralization reaction.Notably,the addition of steel rolling sludge incineration slag reduced dioxin concentrations in the sintering flue gas.Although CO,NO_(x),and SO_(2)emission concentrations slightly increased,the existing flue gas treatment system effectively controlled their emissions.展开更多
Zinc extraction residue,a solid waste generated from the treatment of zinc-containing dust in rotary kilns,is commonly stockpiled in steel companies for extended periods.It poses significant disposal challenges and en...Zinc extraction residue,a solid waste generated from the treatment of zinc-containing dust in rotary kilns,is commonly stockpiled in steel companies for extended periods.It poses significant disposal challenges and environmental pollution risks.So far,research on the treatment of zinc extraction residues has been slow,inadequate,and sporadic.For this gap,a novel approach was proposed to effectively treat the zinc extraction residue via the iron ore sintering process.It was feasible to add 1 wt.%of zinc extraction residues to the sintering raw materials.The more adequate mineralization reaction resulted in higher yield and tumbler indexes,despite a slight decrease in sintering speed.Although this may result in a slight decrease in sintering speed,the more complete mineralization reaction leads to improved sintering yield and tumbler index.Interestingly,the addition of zinc extraction residues reduced the CO and NO_(x) concentrations in the sintering flue gas.Thus,the iron ore sintering process provided a viable solution for resource utilization and environmentally friendly treatment of zinc extraction residues.展开更多
基金supported by the National Natural Science Foundation of China(52004001)the Natural Science Foundation of Anhui Province(2408085ME107).
文摘With China’s strong emphasis on achieving ultra-low emissions in the steel industry,the precise desulfurization of blast furnace gas(BFG)has emerged as a critical research area.The complex composition of sulfides in blast furnace gas presents substantial challenges to the development of effective front-end desulfurization technologies.Given the close relationship among BFG desulfurization process design,equipment selection,and the speciation of sulfur compounds,the generation pathways and mechanisms of sulfides in BFG were investigated using the blast furnace charge structure as a foundation.A thermodynamic C–H_(2)–SO_(2) system was constructed with FactSage and substantiated through experimental studies.Results show that in the C–H_(2)–SO_(2) system when the molar fraction of H_(2) is not more than 1.0 mol and temperatures are below 1450℃,H_(2)S,COS,S_(2),and CS_(2) interconvert.Higher H_(2) levels suppress COS production,rendering COS unstable above 1000℃ and H_(2)S unstable above 1450℃.At temperatures exceeding 2000℃,CS_(2) and CS prevail as the primary sulfur-containing species,with trace amounts of H_(2)S and S_(2) present.Sulfur in BFG arises from two key pathways within the furnace.Initially,furnace materials in the upper zone release minor quantities of COS and H_(2)S.Subsequently,as bosh gas rises and cools through the cohesive zone,predominant sulfur compounds CS_(2) and S_(2) react intricately with CO,CO_(2),H_(2),CH_(4),and H_(2)O,yielding mainly organic sulfur COS and CS_(2) alongside small fractions of inorganic sulfur H_(2)S and SO_(2),which ultimately enter the top gas.
基金supported by the National Natural Science Foundation of China(52204331)Natural Science Foundation of Anhui Province Youth Project(2208085QE145)the Open Project Program of Key Laboratory of Metallurgical Emission Reduction&Resources Recycling(Anhui University of Technology),Ministry of Education(JKF20-03).
文摘Steel rolling sludge,an oil-containing waste generated during steel production,was difficult to manage.Prolonged storage poses significant environmental and health hazards.Most steel enterprises in China use steel rolling sludge directly as a raw material for sintering.However,its adhesive nature caused poor mixing with other materials,affecting the quality of the sinter.Herein,the incorporation of steel rolling sludge incineration slag into the sintering process was investigated for experimental purposes.The results indicated that adding 1%incinerated steel rolling sludge to the sintering raw material was feasible.At this proportion,both the yield and the tumbler index of the sinter have improved,primarily due to the oxidation reaction of Fe_(3)O_(4)present in the steel rolling sludge incineration slag during the sintering process,which significantly increases the sensible heat of the sinter and enhances the sintering mineralization reaction.Notably,the addition of steel rolling sludge incineration slag reduced dioxin concentrations in the sintering flue gas.Although CO,NO_(x),and SO_(2)emission concentrations slightly increased,the existing flue gas treatment system effectively controlled their emissions.
基金supported by the National Natural Science Foundation of China (52204331)Natural Science Foundation of Anhui Province Youth Project (2208085QE145)Open Fund of Key Laboratory of Metallurgical Emission Reduction and Resource Utilization,Ministry of Education (JKF20-03).
文摘Zinc extraction residue,a solid waste generated from the treatment of zinc-containing dust in rotary kilns,is commonly stockpiled in steel companies for extended periods.It poses significant disposal challenges and environmental pollution risks.So far,research on the treatment of zinc extraction residues has been slow,inadequate,and sporadic.For this gap,a novel approach was proposed to effectively treat the zinc extraction residue via the iron ore sintering process.It was feasible to add 1 wt.%of zinc extraction residues to the sintering raw materials.The more adequate mineralization reaction resulted in higher yield and tumbler indexes,despite a slight decrease in sintering speed.Although this may result in a slight decrease in sintering speed,the more complete mineralization reaction leads to improved sintering yield and tumbler index.Interestingly,the addition of zinc extraction residues reduced the CO and NO_(x) concentrations in the sintering flue gas.Thus,the iron ore sintering process provided a viable solution for resource utilization and environmentally friendly treatment of zinc extraction residues.
