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Special issue on resources recycling of solid wastes from ironmaking and steelmaking

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Journal of Iron and Steel Research International 2023年第7期30卷 1301-1302页

作者： Xue-wei Lv hong-ming long Run Huang College of Materials Science and Engineering Chongqing UniversityChongqing 400030China College of Metallurgical Engineering Anhui University of TechnologyHefei 243099AnhuiChina College of Materials and Metallurgy Guizhou UniversityGuiyang 550025GuizhouChina

Driven by the double carbon policy,the iron and steel industry urgently needs to implement a new development concept to strengthen the use of solid waste resources from ironmaking and steelmaking and effectively enhance the economic benefits of recycling resources in order to reduce the accumulation of solid waste resources in the iron and steel *** iron and steel production process produces more than 600 million tons of solid waste annually,including metallurgical dust sludge,blast furnace slag and steel slag,*** the perspective of environmental friendliness,the efficient utilization of ironmaking and steelmaking solid waste resources through innovative cross-industry technologies is of great significance to the low-carbon,green and high-quality development goals of the iron and steel industry.

关键词： steel solid annually

Non-isothermal reduction process analysis of iron-bearing burden with charging iron coke hot briquette under simulated blast furnace conditions

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Journal of Iron and Steel Research International 2022年第5期29卷 741-750页

作者： hong-tao Wang Man-sheng Chu Ji-wei Bao Zheng-gen Liu hong-ming long School of Metallurgy Engineering Anhui University of TechnologyMa’anshan243032AnhuiChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina Key Laboratory of Metallurgical Emission Reduction&Resources Recycling Anhui University of TechnologyMinistry of EducationMa’anshan243032AnhuiChina

Highly reactive iron coke hot briquette(ICHB)prepared by carbonizing the agglomerate of iron-bearing substance and blended coals is regarded as an alternative fuel to mitigate carbon emission and energy consumption of blast ***,the reduction process of iron-bearing burden is extremely crucial for blast furnace *** effects of ICHB on the non-isothermal reduction process of iron-bearing burden with different reduction properties were thus experimentally studied under the conditions of simulated blast furnace lump zone(below 1100°C),and the related mechanism was discussed and *** results showed that the non-isothermal reduction process of iron-bearing burden is promoted by adding *** the charging ratio of ICHB is increased from 0%to 30%,the reduction degree of pellet is increased from 22.91%to 36.62%,but the increased amplitude is leveled ***,the reduction degree of sinter is raised from 35.10%to 93.33%.It is also indicated that the promotion effect of ICHB on the non-isothermal reduction of iron-bearing burden depends on the reduction property of *** with the burden with poor reduction performance(such as pellet 1),the promotion is more significant for the burden with good reduction property(such as sinter 1)since the reduction reaction of iron oxide in iron-bearing burden and the gasification of carbon in ICHB are remarkably reinforced each *** practical application of ICHB in blast furnace should be utilized with highly reductive iron-bearing burden.

关键词： Iron coke hot briquette Non-isothermal reduction Iron-bearing burden Low carbon emission Blast furnace

Application of steam injection in iron ore sintering:fuel combustion efficiency and CO emissions

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Journal of Iron and Steel Research International 2023年第1期30卷 31-39页

作者： Yi-fan Wang Tao Yang Hao-yu Wang long Ding Yun-fei Luo hong-ming long School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243032AnhuiChina Department of Chemical/Biochemical Engineering Western UniversityLondon N6A 5B9OntarioCanada Key Laboratory of Metallurgical Emission Reduction&Resources Recycling(Anhui University of Technology) Ministry of EducationMa’anshan 243002AnhuiChina

Improving the combustion efficiency of fuels is essential to reducing pollutant emissions in the iron ore sintering *** sintering bed surface steam-injection technology has attracted significant research interest for its potential advantages in low-energy consumption and low *** effect of steam injection on fuel combustion efficiency and CO emission was studied by comparing the thermodynamic response from the sintering process before and after steam *** mechanism of improving combustion efficiency was also *** results indicated that the sintering gas medium of H_(2)O-H_(2)-N_(2)-O_(2) with the blown steam improved the heat transfer conditions of fuel combustion and promoted the water gas *** optimum state of steam injection was achieved at 15 min after ignition with 0.02 m^(3) min^(-1).The CO emission reduction is 10.91% compared with the base *** combustion efficiency was 88.83%,6.15% higher than conventional sintering,and the solid fuel consumption was reduced by 1.15 kg t^(-1).It was indicated that steam injection would improve combustion efficiency and reduce solid fuel ***,the steam injection could improve the combustion kinetic conditions in the zone of unburned fuel and low oxygen partial *** was conducive to the reaction of H_(2)O with C and CO to convert the CO of reducing atmosphere to CO_(2),which in turn realized the complete combustion of fuel and CO and improved the efficiency of fuel combustion.

关键词： Sintering Steam injection Fuel Combustion efficiency CO emission

Detection of the assimilation characteristics of iron ores: Dynamic resistance measurements

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International Journal of Minerals,Metallurgy and Materials 2020年第1期27卷 18-25页

作者： Li-xin Qian Tie-jun Chun hong-ming long Qing-min Meng School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243002China Key Laboratory of Metallurgical Emission Reduction&Resources Recycling Ministry of EducationAnhui University of TechnologyMa’anshan 243002China

Resistance in iron ore undergoes a sharp change of up to several orders of magnitude when the sintered solid phase changes to liquid *** view of the insufficiency of existing assimilation detection methods,a timing-of-assimilation reaction is proposed,which was judged by continuously detecting the changes in resistance at the reaction *** of pole position and additional amounts of iron ore on assimilation reaction timing were *** results showed that the suitable depth of pole groove was about 2 mm,and there was no obvious impact when the distance of the poles changed from 4 to 6 mm,or the amount of iron ore changed from 0.4 to 0.6 *** temperature of sudden change of resistance in the temperature-resistant image was considered to be the lowest assimilation temperature of iron *** accuracy of this resistance method was clarified by X-ray diffraction,optical microscope,and scanning electron microscope/energy dispersive spectrometer(SEM/EDS)analyses.

关键词： iron ore sintering assimilation characteristic resistance method interface

Visualization of collision and aggregation behavior of particles simulating movement of inclusions in molten steel

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Journal of Iron and Steel Research International 2018年第2期25卷 173-180页

作者： Qiang Yue Zeng Hu Zhao-yang Wu hong-ming long Qing-min Meng Key Laboratory of Metallurgical Emission Reductionand Resources Recycling (Anhui University of Technology) Ministry of Education Ma'anshan 243002 Anhui China The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081 Hubei China School of Metallurgical Engineering Anhui Universityof Technology Ma'anshan 243002 Anhui China

Inclusions with sizes less than 1 μm in molten steel are difficult to float up to the molten steel and slag interface owing to their slow terminal velocity. Thus, increasing the size of inclusion is essential for accelerating the removal of inclusions. Polystyrene particles simulating inclusions in molten steel were quantified by direct observation of the particle collision behavior in a turbulent flow in a water model. The box-counting fractal dimension of particles was calculated by processing the binary images of aggregated particles. The fractal dimension of the outer contours of the single plastic particles was smaller than that of the aggregated particles. The fractal dimension was varied from 1.14 to 1.35. When two or more monomer particles collide, the aggregates are separated more easily, as the temperature increases from 40 to 80 ℃. The aggregated particles were loose and easy to separate in the high-temperature aqueous solution. The effect of temperature on the surface tension of liquid and the interracial tension of solid and liquid is obvious. The particles are wetting in the water solution at a temperature more than 60 ℃. The relationship between the velocity of the particles and the fractal dimension of the solid particles with the equivalent diameter was discussed.

关键词： Non-metallic inclusion Fractal Box-counting dimension Visualization Collision. Aggregation

A promising method to recover spent V_(2)O_(5)-WO_(3)/TiO_(2) catalyst: treatment by vanadium-titanium magnetite sintering process

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Journal of Iron and Steel Research International 2022年第8期29卷 1176-1184页

作者： hong-ming long Yu-dong Zhang Tao Yang Li-xin Qian Zheng-wei Yu School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243002AnhuiChina Anhui Province Key Laboratory of Metallurgy Engineering and Resources Recycling Anhui University of TechnologyMa’anshan 243002AnhuiChina

A large number of spent selective catalytic reduction(SCR)denitration catalysts are produced after the ultra-low emission transformation of coal-fired power plants in *** to the China’s“Directory of National Hazardous Wastes(Version 2021)”,these spent vanadium-tungsten-titanium catalysts are classified as“HW50”hazardous waste,and their disposal and utilization processes have been strictly ***,an effective and low-cost technique was developed to treat and utilize these spent SCR catalysts by the vanadium-titanium magnetite sintering *** of adding spent SCR catalysts on the sintering production process and product quality indexes of sinter were *** results showed that adding spent SCR catalysts can improve the sintering granulation and green feed permeability,thereby increasing the productivity and flame front *** the addition proportion of spent SCR catalysts is less than 1 wt.%,the performance indexes of the finished sinter are basically equal to those of the finished sinter without adding spent SCR *** increasing the proportion of spent SCR catalysts to 2.0 wt.%results in a decrease in product quality indexes,which could be attributed to the increase in perovskite content in the finished sinter.

关键词： Spent selective catalytic reduction catalyst Hazardous waste Vanadium-titanium magnetite sintering Recovery Utilization

Application status and comparison of dioxin removal technologies for iron ore sintering process

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Journal of Iron and Steel Research International 2018年第4期25卷 357-365页

作者： hong-ming long Qi Shi hong-liang Zhang Ru-fei Wei Tie-jun Chun Jia-xin Li Key Laboratory of Metallurgical Emission Reduction & Resources Recycling Ministry of Education Anhui University of Technology Ma'anshan 243002 Anhui China School of Metallurgical Engineering Anhui University of Technology Ma'anshan 243002 Anhui China

The emission of dioxins from the iron ore sintering process is the largest emission source of dioxins, and the reduction in dioxin emission from the iron ore sintering process to the environment is increasingly important. Three approaches to control the emission of dioxins were reviewed： source control, process control, and terminal control. Among them, two terminal control technologies, activated carbon adsorption and selective reduction technology, were discussed in detail. Following a comparison of the reduction technologies, the terminal control method was indicated as the key technology to achieve good control of dioxins during the sintering process. For the technical characteristics of the sintering process and flue gas, multiple methods should be collectively considered, and the most suitable method may be addition of inhibitors ＋ ultra-clean dust collection （electrostatic precipitation/bag filter）＋ desulphurization ＋ selective catalytic reduction to sufficiently remove multiple pollutants, which provides a direction for the cooperative disposal of flue gas pollutants in future.

关键词： Iron ore sintering process Dioxins Removal technology Activated carbon adsorption Selective catalyticreduction

Resource utilization of flue gas calcium-based desulfurization ash:a comprehensive review

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Journal of Iron and Steel Research International 2023年第3期30卷 405-418页

作者： Dong-xiang Meng Ru-fei Wei Fei-hu Zhang hong-ming long Yuan-yuan Zhou School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243032AnhuiChina Key Laboratory of Metallurgical Emission Reduction and Resources Recycling Ministry of EducationAnhui University of TechnologyMa’anshan 243032China Industrial Development Research Center China Metallurgical Industry Planning and Research InstituteBeijing 100013China

Calcium-based desulfurization ash(CDA)is mainly produced in dry and semi-dry flue gas desulfurization *** property of CDA is extremely unstable because its main component,calcium sulfite,makes it difficult to be directly applied to the field of building *** modification of desulfurization ash can be realized by high-temperature oxidation and wet *** modification,CDA can be widely used in building *** oxidation has broad development prospects because it can complete the oxidation of CDA and the removal of impurity elements at the same *** can be used to prepare high value-added products of calcium sulfate whiskers and ecological rubber fillers.

关键词： Calcium-based desulfurization ash Oxidation modification Building material Calcium sulfate whisker Flue gas desulfurization

Drop strength measurement of green pellet based on drop-rebound mechanism

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Journal of Iron and Steel Research International 2023年第11期30卷 2143-2152页

作者： Jie Lei Xu Gao Jing-shu An Guang-da Bao Yu-qi Kong hong-ming long School of Metallurgical Engineering Anhui University of TechnologyMa’anshan243032AnhuiChina Key Laboratory of Metallurgical Emission Reduction and Resource Comprehensive Utilization Anhui University of TechnologyMa’anshan243032AnhuiChina

The construction of blast furnace charge structure based on pellet and the development of short process from non-blast furnace to electric furnace will be an efficient way to accomplish"carbon peak,carbon neutral".Since drop strength is one of the most crucial quality indexes for green pellet,the crack detection in the collision process is an indispensable segment;however,the present crack determination is basically completed *** to a series of problems including high labor intensity and poor detection conditions,it is urgent to develop an accurate,convenient and fast standardized method for drop strength *** view of the above issues,combined with plenty of experimental studies,it is found that whether rebound occurs after the collision of green ball can be used as the basis for judging if there are cracks on the surface,and the mechanism of this segment is explained by the energy conversion of collision process that the plastic deformation of the collision is a cumulative *** collision will cause a slight displacement of the iron ore particles;until the cumulative displacement exceeds the binding force between the particles,they will slip in a large range,that is,cracks will *** drop strength can be detected based on the drop-rebound mechanism determining crack generation during collision process by high-speed cameras,and the method is fully applicable to oxidized pellets with particle size of 8-16 mm though various pellet plasticities and masses increase the difficulty of bounce height *** on the drop-rebound mechanism of green pellet,three methods for automatically detecting the drop strength are proposed,which are high-speed camera,photoelectric sensor and pressure sensor methods.

关键词： Green pellet Drop strength Collision Rebound Crack