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Direct Reduction of High-phosphorus Oolitic Hematite Ore Based on Biomass Pyrolysis

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Journal of Iron and Steel Research International 2016年第9期23卷 874-883页

作者： Dong-bo HUANG Yan-bing ZONG ru-fei wei wei GAO Xiao-ming LIU School of Metallurgical and Ecological Engineering University of Science and Technology Beijing School of Civil and Environmental Engineering University of Science and Technology Beijing State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

Direct reduction of high-phosphorus oolitic hematite ore based on biomass pyrolysis gases （CO, H2, and CH4 ）, tar, and char was conducted to investigate the effects of reduction temperature, iron ore-biomass mass ratio, and reduction time on the metallization rate. In addition, the effect of particle size on the dephosphorization and iron recovery rate was studied by magnetic separation. It was determined that the metallization rate of the hematite ore could reach 99.35 % at iron ore-biomass mass ratio of 1 ： 0.6, reduction temperature of 1100℃, and reduction time of 55 min. The metallization rate and the aggregation degree of iron particles increase with the increase of reduction temperature. The particle size of direct reduced iron （DRI） has a great influence on the quality of the iron concentrate during magnetic separation. The separation degree of slag and iron was improved by the addition of 15 mass% sodium carbonate. DRI with iron grade of 89.11%, iron recovery rate of 83.47%, and phosphorus content of 0.28% can be obtained when ore fines with particle size of -10μm account for 78.15%.

关键词： high-phosphorus oolitic hematite ore direct reduction biomass pyrolysis dephosphorization

Staged reaction kinetics and characteristics of iron oxide direct reduction by carbon

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International Journal of Minerals,Metallurgy and Materials 2015年第10期22卷 1025-1032页

作者： ru-fei wei Da-qiang Cang Ling-ling Zhang Yuan-yuan Bai School of Metallurgical and Ecological Engineering University of Science and Technology Beijing State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Civil and Environmental Engineering University of Science and Technology Beijing Key Laboratory of Electromagnetic Processing of Materials of the Ministry of Education Northeastern University

Staged reduction kinetics and characteristics of iron oxide direct reduction by carbon were studied in this work. The characteristics were investigated by simultaneous thermogravimetric analysis, X-ray diffraction（XRD）, and quadrupole mass spectrometry. The kinetics parameters of the reduction stages were obtained by isoconversional（model-free） methods. Three stages in the reduction are Fe2O3→Fe3O4, Fe3O4→Fe O, and Fe O→Fe, which start at 912 K, 1255 K, and 1397 K, respectively. The CO content in the evolved gas is lower than the CO2content in the Fe2O3→Fe3O4stage but is substantially greater than the CO2 contents in the Fe3O4→Fe O and Fe O→Fe stages, where gasification starts at approximately 1205 K. The activation energy（E） of the three stages are 126–309 k J/mol, 628 k J/mol, and 648 k J/mol, respectively. The restrictive step of the total reduction is Fe O→Fe. If the rate of the total reduction is to be improved, the rate of the Fe O→Fe reduction should be improved first. The activation energy of the first stage is much lower than those of the latter two stages because of carbon gasification. Carbon gasification and FexOy reduction by CO, which are the restrictive step in the last two stages, require further study.

关键词： iron oxides direct reduction reduction kinetics re

Low-temperature oxidation behavior and mechanism of semi-dry desulfurization ash from iron ore sintering flue gas

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Journal of Iron and Steel Research International 2021年第9期28卷 1075-1081页

作者： Yi-fan Wang Yu-dong Zhang Hong-ming Long Li-xin Qian Yun-fei Luo ru-fei wei School of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243032AnhuiChina Key Laboratory of Metallurgical Emission Reduction and Resources Recycling(Anhui University of Technology) Ministry of EducationMa'anshan 243002AnhuiChina

The low-temperature wet oxidation behavior of semi-dry desulfurization ash from iron ore sintering flue gas in ammonium citrate solution was investigated for efficiently utilizing the low-quality desulfurization ash. The effects of the ammonium citrate concentration, oxidation temperature, solid/liquid ratio, and oxidation time on the wet oxidation behavior of desulfurization ash were studied. Simultaneously, the oxidation mechanism of desulfurization ash was revealed by means of X-ray diffraction, Zeta electric resistance, and X-ray photoelectron spectroscopy (XPS) analysis. Under the optimal conditions with ammonium citrate, the oxidation ratio of CaSO_(3) was up to the maximum value (98.49%), while that of CaSO_(3) was only 8.92% without ammonium citrate. Zeta electric resistance and XPS results indicate that the dissolution process of CaSO_(3) could be significantly promoted by complexation derived from the ammonium citrate hydrolysis. As a result, the oxidation process of CaSO_(3) was transformed from particle oxidation to SO_(3)^(2−) ion oxidation, realizing the rapid transformation of desulfurization ash from CaSO_(3) to CaSO_(4) at low temperature. It provides a reference for the application of semi-dry desulfurization ash and contributes to sustainable management for semi-dry desulfurization ash.

关键词： Semi-dry desulfurization ash Ammonium citrate Calcium sulfite Calcium sulfate Wet oxidation Sintering flue gas Low-temperature oxidation

Novel method for improving iron recovery from electric arc furnace slag: on-site hot modification

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Journal of Iron and Steel Research International 2022年第8期29卷 1224-1235页

作者： Xiang Lu Xiao-li Huang ru-fei wei Wen Chen Da-qiang Cang fei-hua Yang Chun-lei Pu Changsha Research Institute of Mining&Metallurgy Co. Ltd.Changsha 410012HunanChina School of Metallurgy and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Technological Institute of Development and Strategy Studies Panzhihua 617000SichuanChina School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243000AnhuiChina State Key Laboratory of Solid Waste Reuse for Building Materials(SKL-SWR) Beijing Building Materials Academy of Sciences Research(BBMA)Beijing 100083China Iron and Steel Technology Research Institute HUATIAN Engineering&Technology CorporationMCCNanjing 210019JiangsuChina

The iron element in electric arc furnace(EAF)slag is extremely difficult to recycle due to the low specific magnetic susceptibility of the RO phase(a solid solution of FeO,MgO,CaO,and MnO).Landfilling EAF slag is strictly forbidden for environmental consideration because of poisonous Cr^(6+) *** original RO phase could be transformed to a spinel structure,whose specific magnetic susceptibility is much higher than that of other minerals,through hot modification,resulting in significantly increased iron recovery by magnetic *** of spinel crystals encloses chromium,such that iron and chromium could be recovered *** chromium in obtained iron concentrates is considerably useful for stainless steel making rather than polluting the *** a result,recovering iron and chromium is truly beneficial for cleaner *** modification of EAF slag should be conducted at 1500-1600ºC for at least 60 min to guarantee homogeneous liquid *** liquid slag was poured onto an iron mold to obtain modified slag(MS)through air *** was characterized by thermodynamic analysis,X-ray diffraction,and scanning electron microscopy combined with energy-dispersive spectroscopy to correlate the relationship between mineral structures and iron *** iron recovery rate of MS first increased and then decreased with increasing *** was less than 10%when the modifier addition amount was below 12 wt.%,but it increased rapidly as the modifier addition amount increased from 16 to 24 wt.%,mainly due to spinel *** highest iron recovery rate was 81.9%when the modifier amount reached 20 wt.%.Meanwhile,Cr^(6+) was enriched in the spinel phase but was not observed in other *** tests were performed on-site with the modifier ranging from 12 to 18 wt.%because additional heat was not provided during the *** showed that MS with 18 wt.%modifier addition exhibited an iron recovery rate of 61.0%,much h

关键词： EAF slag On-site hot modification Iron recovery Chromium recovery Spinel Industrial test

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

Mechanisms of ultrafine particle formation during coal combustion in a new swirl modification device

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Journal of Iron and Steel Research International 2019年第1期26卷 11-19页

作者： Jun-xiang Guo Ling-ling Zhang Wen-bin Dai Li-ying Qi ru-fei wei Da-qiang Cang School of Metallurgical and Ecological Engineering University of Science and Tech no logy BeijingBeijing 100083China School of Energy and Environment Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Solid Waste Reuse for Building Materials(SKL-SWR) Beijing Building Materials Academy of Sciences Research(BBMA)Beijing 100083China College of Energy and Environmental Engineering Hebei University of EngineeringHandan 056038HebeiChina

A new swirl combustion device was designed and enhaneed,which realized the utilization of steel slag,achieved highly efficient and clean coal combustion,and simultaneously realized a fully elemental utilization of *** distribution laws of different sized particulate matter(PM)emission and the enrichment laws of elements in particles under diverse conditions(such as various excess air coefficients and different coal ratios)were systematically *** enrichments of PM under both non-staged and fuel-staged conditions were also *** results indicated that fuel-staged combustion is more helpful in reducing PM emissions than non-staged combustion,and a suitable coal ratio is also beneficial for reducing PM *** melted liquid steel slag drop captured the fly ash produced from pulverized combustion,thus reducing PM *** alkali metal elements(K,Na,and Mg),the trace elements(As and Ti).and S have an obvious enrichment tendency in PM]and PM2.5,A different coal ratio under fuel-staged combustion has a significant influence on the enrichment of Al,Si,Ca,and Fe in PM),whereas in ***4,and PM10,the effect of different coal ratios on the enrichment of each element is slight.

关键词： Coal combustion Steel slag modification Particulate matter Elemernal enrichment Fuel-staged feed Non-staged feed Swirl modification device

Impacts of proppant distribution on development of tight oil reservoirs with threshold pressure gradient

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Petroleum Science 2024年第1期21卷 445-457页

作者： Ming Yue wei-Yao Zhu fei-fei Gou Tian-ru Song Yu-Chun You Qi-Tao Zhang State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing102206China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing100083China

Field evidence indicates that proppant distribution and threshold pressure gradient have great impacts on well *** at the development of unconventional oil reservoirs in Triassic Chang-7 Unit,Ordos Basin of China,we presented an integrated workflow to investigate how(1)proppant placement in induced fracture and(2)non-linear flow in reservoir matrix would affect well productivity and fluid flow in the *** with our research before(Yue et al.,2020),here we extended this study into the development of multi-stage fractured horizontal wells(MFHWs)with large-scale complicated fracture *** integrated workflow is based on the finite element method and consists of simulation models for proppant-laden fluid flow,fracture flow,and non-linear seepage flow,*** results indicate that the distribution of proppant inside the induced cracks significantly affects the productivity of the *** we assign an idealized proppant distribution instead of the real distribution,there will be an overestimation of 44.98%in daily oil rate and 30.63%in cumulative oil production after continuous development of 1000 ***,threshold pressure gradient(TPG)also significantly affects the well performance in tight oil *** we simply apply linear Darcy’s law to the reservoir matrix,the overall cumulative oil production can be overrated by 77%after 1000 days of *** general,this research provides new insights into the development of tight oil reservoirs with TPG and meanwhile reveals the significance of proppant distribution and non-linear fluid flow in the production scenario design.

关键词： Proppant distribution Tight oil reservoir Multi-stage fractured horizontal well Threshold pressure gradient Moving boundary

Effects of gangue compositions on reduction process of carbonbearing iron ore pellets

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Journal of Iron and Steel Research International 2018年第11期25卷 1105-1112页

作者： Qing-min Meng Jia-xin Li ru-fei wei Hong-ming Long Tie-jun Chun Ping Wang Zhan-xia Di Luana Dessbeseli Chunbao Xu School of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243002AnhuiChina Key Laboratory of Metallurgical Emission Reduction and Resources Recycling (Anhui University of Technology) Ministry of EducationMa'anshan 243002AnhuiChina Department of Chemical and Biochemical Engineering Western UniversityLondonON N6A 3K7Canada

The influence of gangue compositions (mainly composed of SiO2,CaO,MgO and Al2O3)on the reduction kinetics of carbon-bearing iron ore pellets was estimated at 1373-1473 K in N2 *** results showed that gangue content and each component distribution affected the pellets reduction *** reduction rate was found to follow a linear correlation with quaternary basicity R4 [mass ratio of (CaO +MgO)to (SIO2 +Al2O3)]of the carbon-beating iron ore pellets;also,the content of SiO2 solid solution in iron oxide had a significant impact on the reduction *** the same reduction temperature,a higher R4 resulted in a lower SiO2 free content,weakening its inhibitory effect on the Boudouard *** reduction temperature of Fe2SiO4 could be reduced by increasing the contents of CaO and MgO,improving the iron oxide reduction as well as the precipitation and growth of the iron *** g'angue content and .component distribution showed no effect on the rate-controlling step of the reduction;however,the apparent activation energy of reaction decreased with increasing quaternary *** R4 increased from 0.15 to 0.67,the apparent activation energy decreased from 228.51 to 193.66 kJ/mol.

关键词： Carbon-bearing iron ore pellet Gangue composition Quaternary basicity Reduction kinetics Apparent activation energy

DBN-GABP model for estimation of aircraft wake vortex parameters using Lidar data

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Chinese Journal of Aeronautics 2024年第9期37卷 347-368页

作者： Zhiqiang wei Tong LU runping GU fei LIU College of Air Traffic Management Civil Aviation University of ChinaTianjin 300300China

Aircraft wake turbulence is an inherent outcome of aircraft flight,presenting a substan-tial challenge to air traffic control,aviation safety and operational *** upon data obtained from coherent Doppler Lidar detection,and combining Dynamic Bayesian Networks(DBN)with Genetic Algorithm-optimized Backpropagation Neural Networks(GA-BPNN),this paper proposes a model for the inversion of wake vortex *** the wake vortex flow field simulation analysis,the wind and turbulent environment were initially superimposed onto the simulated wake velocity ***,Lidar-detected echoes of the velocity field are simulated to obtain a data set similar to the actual situation for model *** the case study validation,real measured data underwent preprocessing and were then input into the established *** allowed us to construct the wake vortex characteristic parameter inversion *** final results demonstrated that our model achieved parameter inversion with only minor *** a practical example,our model in this paper significantly reduced the mean square error of the inverted velocity field when compared to the traditional *** study holds significant promise for real-time monitoring of wake vortices at airports,and is proved a crucial step in developing wake vortex interval standards.

关键词： Air traffic control Wake vortex flow field simulation Lidar echo simulation DBNmodel GA-BP model Wakevortex characteristic parameter inversion model