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Influence of coke rate on thermal treatment of waste selective catalytic reduction(SCR)catalyst during iron ore sintering

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Chinese Journal of Chemical Engineering 2022年第2期35卷 415-423页

作者： Pengnan Ma Jiankang Wang Hanxiao Meng Laiquan Lv Hao Fang Kefa Cen Hao Zhou State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou 310027China

Waste selective catalytic reduction(SCR)catalyst as a hazardous waste has a significant impact on the environment and human *** present study,a novel technology for thermal treatment of waste SCR catalyst was proposed by adding it to sinter mix for iron ore *** influences of coke rate on the flame front propagation,sinter microstructure,and sinter quality during sintering co-processing the waste SCR catalyst process were *** situ tests results indicated the maximum sintering bed temperature increased at higher coke rate,indicating more liquid phase generated and higher airflow *** sintering time was longer and the calculated flame front speed dropped at higher coke *** microstructure results found the coalescence and reshaping of bubbles were more fully with increasing coke *** porosity dropped from 35.28%to 25.66%,the pore average diameter of large pores decreased from 383.76μm to 311.43μ*** increasing coke rate,the sinter indexes of tumbler index,productivity,and yield,increased from 33.2%,9.2 t·m^(-2)·d^(-1),28.9%to 58.0%,36.0 t·m^(-2)·d^(-1),68.9%,***,a comprehensive index was introduced to systematically assess the influence of coke rate on sinter quality,which rose from 100 to 200 when coke rate was increased from 3.5%(mass)to 5.5%(mass).

关键词： Flame front Waste selective catalytic reduction(SCR) catalyst Thermal treatment iron ore sintering

Investigation on the evolution characteristics of bed porous structure during iron ore sintering

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Particuology 2023年第3期74卷 35-47页

作者： Jiankang Wang Pengnan Ma Hanxiao Meng Fangzheng Cheng Hao Zhou State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou310027China

To better understand the evolution characteristics of bed porous structure during iron ore sintering,X-ray computed tomography scanning technology was used to analyze the pore parameters in different areas of the sintering bed.A pore skeleton structure model was established to study the characteristics of the airflow channels in different *** absolute permeability of different areas was calculated through simulation,and the corresponding streamline and pressure drop distribution were *** results show that the porosity of raw material zone,high-temperature zone,and sintered zone increases gradually,which are 37.69%,46.41%,and 55.57%,*** absolute permeability calculation results of the raw material zone and sintered zones are 792.49μm^(2) and 20560.80μm^(2),while the tortuosity is 1.77 and 1.45,*** with the raw material zone,the flow streamline in the sintered zone is thicker and denser,the airflow resistance and the pressure drop are minor.

关键词： Flame front Porous bed structure iron ore sintering

Emission characteristics and control technology of heavy metals during collaborative treatment of municipal solid waste incineration fly ash in iron ore sintering process

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Journal of iron and Steel Research International 2024年第11期31卷 2655-2663页

作者： Xiao-hui Fan Zhi-an Zhou Bin-bin Huang Zhi-yun Ji Min Gan Zeng-qing Sun Xu-ling Chen Xiao-xian Huang Guo-jing Wang School of Minerals Processing and Bioengineering Central South UniversityChangsha410083HunanChina Hubei Provincial Key Laboratory of Regional Development and Environmental Response Department of Environmental EngineeringHubei UniversityWuhan430062HubeiChina

The municipal solid waste incineration fly ash (MSWI-FA) contains a large amount of heavy metals, and the process of iron ore sintering and treating fly ash needs to pay attention to the migration characteristics of heavy metals. The impact of the application of MSWI-FA in the sintering process on the emission law of heavy metals in the collaborative treatment process was studied, and corresponding control technologies were proposed. The results showed that the direct addition of water washing fly ash (WM-FA) powder resulted in varying degrees of increase in heavy metal elements in the sinter. As the amount of WM-FA added increases, the content of heavy metal elements correspondingly increases, and an appropriate amount of WM-FA added is 0.5%–1.0%. The migration mechanism of heavy metals during the sintering treatment of WM-FA was clarified. Heavy metals are mainly removed through direct and indirect chlorination reactions, and Cu and Cr can react with SiO_(2) and Fe_(2)O_(3) in the sintered material to solidify in the sinter. Corresponding control techniques have been proposed to reduce the heavy metal elements in WM-FA through the pre-treatment of WM-FA. When the WM-FA was fed in the middle and lower layers of the sintered material, the high temperature of the lower layer was utilized to promote the removal of heavy metals. The Ni element content has decreased from 130 to 90 mg kg^(−1), and the Cd removal rate has increased by 23%. The removal rates of Cd and Cr elements increase by 2.4 and 5.5 times, respectively. There is no significant change in sintering indexes.

关键词： Control technique Emission characteristics Heavy metal iron ore sintering Municipal solid waste incineration fly ash

Evaluation of granule structure and strength properties of green packed beds in iron ore sintering using high-resolution X-ray tomography and uniaxial compression testing

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Particuology 2021年第4期19卷 157-166页

作者： Mingxi Zhou Hao Zhou State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou 310027China

The strength properties of green sinter beds,including the Young’s modulus and maximum bed strain,were evaluated using uniaxial compression *** green-sinter-bed samples were scanned using X-ray computed tomography(XCT),and the geometry characteristics of the granules were quantified by XCT image *** orthogonal array method was applied to determine the concomitant effects of the moisture,hydrated lime,and concentrate contents on the bed strength *** bed strain was observed when the granules had a thin adhering layer and increased interlock contacts,which had a great capacity to resist the applied load *** optimal combination for decreasing the bed maximum strain was 5.8%moisture,2%hydrated lime,and 0%*** moisture and concentrate contents were the most significant factors determining the green bed *** the moisture and concentrate contents produced granules with a thicker and more deformable adhering layer,resulting in a more compact *** addition of hydrated lime inhibited rearrangement,deformation,and fracture of the granules in green sinter bed during compression.

关键词： Packed bed strength iron ore sintering X-ray computed tomography Uniaxial compression test Granule properties

Influence of ammonia and Brown gas injection on the iron ore sintering characteristics under biochar substitution

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Particuology 2024年第11期94卷 16-28页

作者： Laiquan Lv Jiankang Wang Hanxiao Meng Hao Zhou State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou310027China

The influence of ammonia and Brown gas injection on the iron ore sintering characteristics was explored through sintering pot experiments based on biochar substitution to increase biochar substitution proportion and reduce fossil energy *** dividing the high-temperature stage of the sintering bed,the heating rate and cooling rate were calculated,and the reasons for poor sintering quality under a high biochar substitution ratio were *** results showed that under the 40%biochar substitution ratio,the cooling rate of the sintering bed significantly increased,the high-temperature duration time was short,and the sintering quality deteriorated *** injection of 0.5–1%vol ammonia or 1–2%vol Brown gas can reduce the cooling rate,prolong the high-temperature duration,and optimize the sintering *** on 1%vol ammonia or 2%vol Brown gas injection,reducing the proportion of biochar with equal calorific value further increases the sintering comprehensive index,which means that using 1%vol ammonia or 2%vol Brown gas injection to assist sintering can reduce the proportion of coke usage to 60%,while the proportion of biochar substitution is 33.76%and 32.47%,*** research results provide an effective solution for low-carbon sintering.

关键词： NH_(3)injection Brown gas injection Biochar substitution iron ore sintering Coke consumption reduction

Disposal of zinc extraction residues via iron ore sintering process:an innovative resource utilization

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Journal of iron and Steel Research International 2024年第7期31卷 1636-1645页

作者： Chun-long Fan Cheng-yi Ding Tao Yang Yun-fei Luo Yi-fan Wang Qian Li Hong-ming Long School of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243002AnhuiChina Zhongye Changtian International Engineering Co. Ltd.Changsha 410205HunanChina Key Laboratory of Metallurgical Emission Reduction and Resources Recycling(Ministry of Education) Anhui University of TechnologyMa'anshan 243002AnhuiChina

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 *** poses significant disposal challenges and environmental pollution *** far,research on the treatment of zinc extraction residues has been slow,inadequate,and *** this gap,a novel approach was proposed to effectively treat the zinc extraction residue via the iron ore sintering *** was feasible to add 1 wt.%of zinc extraction residues to the sintering raw *** more adequate mineralization reaction resulted in higher yield and tumbler indexes,despite a slight decrease in sintering *** this may result in a slight decrease in sintering speed,the more complete mineralization reaction leads to improved sintering yield and tumbler ***,the addition of zinc extraction residues reduced the CO and NO_(x) concentrations in the sintering flue ***,the iron ore sintering process provided a viable solution for resource utilization and environmentally friendly treatment of zinc extraction residues.

关键词： Zinc extraction residue iron ore sintering Co-processing Waste utilization Gas pollutant reduction

ore-blending optimization for Canadian iron concentrate during iron ore sintering based on high-temperature characteristics of fines and nuclei

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Journal of iron and Steel Research International 2020年第7期27卷 755-769页

作者： Sheng-li Wu Xiao-bo Zhai Li-xin Su Xu-dong Ma School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

Canadian iron concentrate(CIC)can elevate the ferrous grade and lower the contents of gangue components and harmful elements in the *** understand high-temperature characteristics of CIC and typical iron ore,the formation of the melt was calculated mainly through FactSage 7.2,and melt fluidity(MF)test for iron ore fines and penetration characteristic test of CIC melt into iron ore nuclei were carried out via micro-sintering *** results show that hematite,calcium ferrites,dicalcium silicate,and magnetite take part in the formation of the melt in *** formation temperature of the liquid for CIC is higher than that for hematite/limonite *** MF of CIC is lower than that of hematite/limonite ore *** MF of hematite/limonite ore fines is dominated by the liquid amount and melt *** penetration depth(PD)of CIC melt into limonite ore nuclei is smaller than that into hematite ore *** PD is related to the reaction ability of the nuclei with the *** on above results,sinter pot tests were *** result shows that in the base ore blends including two hematite ores and two limonite ores,adding CIC deteriorates the sintering *** the proportion of high-MF and small-PD hematite ore can significantly improve the sintering indexes.10 mass%is a suit-able proportion for adding CIC in ore blends.

关键词： Canadian iron concentrate iron ore sintering Melt.uidity Penetration depth ore-blending optimization

Structural Change of the iron ore sintering Bed and its Control

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Structural Change of the Iron Ore Sintering Bed and its Cont...

Present situation and development of saving energy and reducing emission technology in iron ore sintering process

技术创新与循环经济——第二届宝钢学术年会

作者： Eiki KASAI Institute of Multidisciplinary Research for Advanced Materials Tohoku University2-1-1 KatahiraSendai981-3108Japan

＜正＞Design of bed structure is a promising approach to increase the productivity of sinter under the condition of increasing use of iron ores containing high combined *** this paper,the characteristics of the structural change of the sintering bed obtained by the in situ observation using X-ray CTS is described and based on it a new process image "MEBIOS" is *** a series of model experiments were conducted and the results proved that this process provide a mechanism of high speed sintering.

关键词： iron ore sintering design of bed structure sinter cake void network large pellet X-ray CTS

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Baosteel Technical Research 2010年第S1期4卷 3-页

作者： ZHU Deqing,CHUN Tiejun and PAN Jian School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China

The energy consumption of iron ore sintering process is about 10%- 15%of the total of iron and steel ***,it is of great significance to take effective measures to reduce the energy consumption in the iron ore sintering process to reduce the costs of sintering product and cut down the emissions of harmful gases,such as CO_2 and SO_*** this study,the technology development of saving energy and reducing emission in iron ore sintering process was reviewed and discussed;some new directions and measures of saving energy were presented for the sintering process in the future.

关键词： iron ore sintering saving energy reducing emission measures