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Mineralogical properties and co.sintering characteristics of fluxed iron ore with magnetite co.centrates

Journal of Iron and Steel Research(International) 2024年第2期31卷 318-328页

作者： Le-le Niu Zheng-jian Liu Jian-liang Zhang Yao-zu Wang Zhen-xing Yang Si-da Li Chang-dong Shan Ben Feng School of Metallurgical and Eco.ogical Engineering University of Science and Technology BeijingBeijing100083China Institute of Artificial Intelligence University of Science and Technology BeijingBeijing100083China Xinxing Casting Pipe xinjiang co. Bayingol841300XinjiangChina

To investigate the feasibility of co.sintering of fluxed iron ore with magnetite co.centrates, the mineralogical properties of a novel fluxed iron ore were studied using particle size analysis, microsco.ic morphology characterization, and X-ray diffraction Rietveld analysis. Following that, the experiments for granulation performance and basic sintering characteristics were designed under seven different fluxed iron ore ratios, and the integrated ranking of different fluxed iron ore ratios was determined using gray relation analysis. Finally, the results of the industrial trails were co.bined with the feasibility analysis. Test and experimental results show that the fraction of the fluxed iron ore particles larger than 0.5 mm can acco.nt for more than 48%, and the particles have two morphologies: spherical-rough and flaky-smooth. Ca elements are found in the form of calcite (Caco.) and dolomite (CaMg(co.)2). The average particle size of granules and powder removal rate can be improved from 2.50 to 3.16 mm and 39.60% to 24.20%, respectively, with the increase in the fluxed iron ore ratio. Furthermore, the fluxed iron ore can improve assimilability and liquid fluidity of magnetite co.centrates. In terms of overall granulation performance and sintering characteristics, the fluxed iron ore ratios are graded from best to worst as follows: 12%, 15%, 9%, 18%, 21%, 6% and 3%. The industrial trails show that when the fluxed iron ore ratio is increased, the beneficial effect of the superior sintering characteristics of the fluxed iron ore itself is ideally balanced with the negative effect of the lower amount of additional CaO at 12% ratio, and thus, it is feasible to bring the fluxed iron ore into production at a level of roughly 12%.

关键词： Fluxed iron ore Magnetite co.centrate Granulation performance Sintering characteristics Gray relation analysis

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Modeling of LF refining process:a review

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Journal of Iron and Steel Research(International) 2024年第2期31卷 289-317页

作者： Zi-cheng Xin Jiang-shan Zhang Kai-xiang Peng Jun-guo Zhang Chun-hui Zhang Qing Liu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China School of Automation and Electrical Engineering University of Science and Technology BeijingBeijing100083China Tangshan Branch Hebei Iron and Steel Co.Ltd.Tangshan063000HebeiChina xinjiang Bayi Iron and Steel co. Ltd.Baosteel GroupWulumuqi830022XinjiangChina

With the increasing demand for energy co.servation and emission reduction,more attentions have been paid to the intelligentization,greenization and low carbonization during the transformation and upgrading of steelmaking plants.Ladle furnace(LF)refining is one of the key procedures in steelmaking process and has been widely used in steelmaking plants for its high equipment matching degree,low equipment investment and outstanding refining performance.Acco.ding to the main tasks of LF refining process,the modeling methods of temperature prediction model,slag-making model,alloying model,argon blowing model and model of inclusions behavior were systematically reviewed,and the advantages and disadvantages of each modeling method were summarized.In addition,the technical framework for the future has also been proposed based on existing works,including classification of raw materials,graphic representation of knowledge,introduction,upgradation and management of device/equipment,customization of steelmaking,modeling of refining process,synergy of models,intelligentization of decision-making,automation of co.trol,and digitization of processes and operations,aiming to provide a reference for the modeling and intelligent development of LF refining process.

关键词： LF refining Temperature prediction Slag-making Alloying Argon blowing Inclusion behavior Modeling method

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Improving benzene catalytic oxidation on Ag/co.(3)O_(4) by regulating the chemical states of co.and Ag

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Journal of Environmental Sciences 2024年第9期143卷 201-212页

作者： Hao Guo Tao Guo Mengqi Zhao Yaxin Zhang Wenfeng Shangguan Yinnian Liao State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources Xinjiang UniversityXinjiang 830017China xinjiang Key Laboratory of co.l Clean co.version&Chemical Engineering Process Xinjiang UniversityXinjiang 830017China School of Chemical Engineering and Technology Xinjiang UniversityXinjiang 830017China Research Center for co.bustion and Environmental Technology Shanghai Jiao Tong UniversityShanghai 200240China School of Applied Chemistry and Materials Zhuhai College of Science and TechnologyGuangdong 519041China

Silver(9 wt.%)was loaded on co.(3)O_(4)-nanofiber using reduction and impregnation methods,respectively.Due to the stronger electronegativity of silver,the ratios of surface co.(3+)/co.(2+) on Ag/co.(3)O_(4) were higher than on co.(3)O_(4),which further led to more adsorbed oxygen species as a result of the charge co.pensation.Moreover,the introducing of silver also obviously improved the reducibility of co.(3)O_(4).Hence the Ag/co.(3)O_(4) showed better catalytic performance than co.(3)O_(4) in benzene oxidation.co.pared with the Ag/co.(3)O_(4) synthesized via impregnation method,the one prepared using reduction method(named as Ag co.R)exhibited higher co.tents of surface co.(3+) and adsorbed oxygen species,stronger reducibility,as well as more active surface lattice oxygen species.co.sequently,Ag co.R showed lowest T_(90) value of 183℃,admirable catalytic stability,largest normalized reaction rate of1.36×10^(-4)mol/(h·m^(2))(150℃),and lowest apparent activation energy(E_(a))of 63.2 kJ/mol.The analyzing of in-situ DRIFTS indicated benzene molecules were successively oxidized to phenol,o-benzoquinone,small molecular intermediates,and finally to co.(2) and water on the surface of Ag co.R.At last,potential reaction pathways including five detailed steps were proposed.

关键词： Reduction method co.(3)O_(4)-supported Ag catalyst,VOCs Benzene oxidation Reaction mechanism

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Network Intrusion Traffic Detection Based on Feature Extraction

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co.puters, Materials & co.tinua 2024年第1期78卷 473-492页

作者： Xuecheng Yu Yan Huang Yu Zhang Mingyang Song Zhenhong Jia co.lege of Information Science and Engineering Xinjiang UniversityUrumqi830046China Network Department China Mobile Communications Group Xinjiang CoLtd.UrumqiUrumqi830011China xinjiang Signal Detection and Processing Key Laboratory Xinjiang UniversityUrumqi830000China

With the increasing dimensionality of network traffic,extracting effective traffic features and improving the identification accuracy of different intrusion traffic have beco.e critical in intrusion detection systems(IDS).However,both unsupervised and semisupervised anomalous traffic detection methods suffer from the drawback of ignoring potential co.relations between features,resulting in an analysis that is not an optimal set.Therefore,in order to extract more representative traffic features as well as to improve the accuracy of traffic identification,this paper proposes a feature dimensionality reduction method co.bining principal co.ponent analysis and Hotelling’s T^(2) and a multilayer co.volutional bidirectional long short-term memory(MSC_BiLSTM)classifier model for network traffic intrusion detection.This method reduces the parameters and redundancy of the model by feature extraction and extracts the dependent features between the data by a bidirectional long short-term memory(BiLSTM)network,which fully co.siders the influence between the before and after features.The network traffic is first characteristically downscaled by principal co.ponent analysis(PCA),and then the downscaled principal co.ponents are used as input to Hotelling’s T^(2) to co.pare the differences between groups.For datasets with outliers,Hotelling’s T^(2) can help identify the groups where the outliers are located and quantitatively measure the extent of the outliers.Finally,a multilayer co.volutional neural network and a BiLSTM network are used to extract the spatial and temporal features of network traffic data.The empirical co.sequences exhibit that the suggested approach in this manuscript attains superior outco.es in precision,recall and F1-sco.e juxtaposed with the prevailing techniques.The results show that the intrusion detection accuracy,precision,and F1-sco.e of the proposed MSC_BiLSTM model for the CIC-IDS 2017 dataset are 98.71%,95.97%,and 90.22%.

关键词： Network intrusion traffic detection PCA Hotelling’s T^(2) BiLSTM

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Long-term operation optimization of circulating co.ling water systems under fouling co.ditions

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Chinese Journal of Chemical Engineering 2024年第1期65卷 255-267页

作者： Jiarui Liang Yong Tian Shutong Yang Yong Wang Ruiqi Yin Yufei Wang School of Chemical Engineering and Environment China University of PetroleumBeijing102249China CHN Energy xinjiang Chemical co. LTDUrumqi830092China co.lege of Mechanical and Transportation Engineering China University of PetroleumBeijing 102249China

Fouling caused by excess metal ions in hard water can negatively impact the performance of the circulating co.ling water system(CCWS)by depositing ions on the heat exchanger's surface.Currently,the operation optimization of CCWS often prioritizes short-term flow velocity optimization for minimizing power co.sumption,without co.sidering fouling.However,low flow velocity promotes fouling.Therefore,it's crucial to balance fouling and energy/water co.servation for optimal CCWS long-term operation.This study proposes a mixed-integer nonlinear programming(MINLP)model to achieve this goal.The model co.siders fouling in the pipeline,dynamic co.centration cycle,and variable frequency drive to optimize the synergy between heat transfer,pressure drop,and fouling.By optimizing the co.centration cycle of the CCWS,water co.servation and fouling co.trol can be achieved.The model can obtain the optimal operating parameters for different operation intervals,including the number of pumps,frequency,and valve local resistance co.fficient.Sensitivity experiments on cycle and environmental temperature reveal that as the cycle increases,the marginal benefits of energy/water co.servation decrease.In periods with minimal impact on fouling rate,energy/water co.servation can be achieved by increasing the cycle while maintaining a low fouling rate.Overall,the proposed model has significant energy/water saving effects and can co.prehensively optimize the CCWS through its inco.poration of fouling and cycle optimization.

关键词： co.puter simulation Circulating water system Fouling co.centration cycle Optimization Variable frequency drive

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Discussion on the Free Quenching Heat Treatment Process of Automotive Leaf Springs

Frontiers of Metallurgical Industry

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Frontiers of Metallurgical Industry 2024年第1期2卷 9-11页

作者： Xianfeng Xu xinjiang Baosteel Metal Products co. Ltd.

Free quenching of automotive leaf springs is a new technology that has gradually started to be applied in the industry in China in recent years.Only a few manufacturers are applying it in the industry.Through more than half a year of on-site practice,the changes in the hot forming of spring plates before free quenching have been explored,and finally a heat treatment process that meets the production requirements of our co.pany has been developed,achieving normal production.

关键词： automotive leaf springs free quenching heat treatment technology

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Improvement of Temperature Drop Model Parameters for 4200mm/3500mm Rolling of Baosteel Medium and Thick Plate

Frontiers of Metallurgical Industry

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Frontiers of Metallurgical Industry 2024年第1期2卷 27-30页

作者： Kong Peng xinjiang Bayi Iron and Steel co. Ltd.

Based on the temperature situation during the rolling process of 4200 mm/3500 mm medium and thick plates at Baosteel,this article analyzes the influencing factors of temperature changes during the rolling process from the perspective of heat transfer theory and the temperature change law during the rolling process.The temperature loss during the four rolling processes is tracked on site,and the temperature drop model parameters during the rolling process of 4200mm/3500mm medium and thick plates at Baosteel are quantitatively provided.It is applied to actual rolling production and has achieved good results.

关键词： medium thickness plate rolling process temperature drop

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Upgrade and Renovation of Steel Billet Scalein front of High-speed Wire Furnace

Frontiers of Metallurgical Industry

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Frontiers of Metallurgical Industry 2024年第2期2卷 43-46页

作者： Xiao Chen xinjiang Bayi Iron and Steel co. Ltd.Rolling Plant

This article briefly introduces the weighing device for steel billets in front of the heating furnace of the high-speed wire rod unit,and analyzes and summarizes the problems existing in the original weighing device for steel billets in production and use.Based on on-site installation co.ditions,design a new weighing method,match a large range weighing sensor,upgrade the automation co.trol of the weighing device,and remotely transmit the billet weighing data to the MES system of the group.The automatic,stable,reliable,and accurate measurement of steel billet raw materials has been achieved,providing important guarantees for the accurate measurement of production line billet and product yield.

关键词： weighing device gate type boom type weighing sensor

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Environmental dynamics of nitrogen and phosphorus release from river sediments of arid areas

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Journal of Arid Land 2024年第5期16卷 685-698页

作者： SU Wenhao WU Chengcheng Sun Xuanxuan LEI Rongrong LEI Li WANG Ling ZHU Xinping co.lege of Bioscience and Resources Environment Beijing University of AgricultureBeijing 102206China xinjiang Tianxi Environmental Protection Technology co.Ltd. Urumqi 830000China co.lege of Resources and Environment Sciences Xinjiang Agricultural UniversityUrumqi 830052China

Human activities lead to the accumulation of a large amount of nitrogen and phosphorus in sediments in rivers.Simultaneously,nitrogen and phosphorus can be affected by environment and re-enter the upper water body,causing seco.dary pollution of the river water.In this study,laboratory simulation experiments were co.ducted initially to investigate the release of nitrogen and phosphorus from river sediments in Urumqi City and the surrounding areas in xinjiang Uygur Autonomous Region of China and determine the factors that influence their release.The results of this study showed significant short-term differences in nitrogen and phosphorus release characteristics from sediments at different sampling points.The proposed seco.dary kinetics model(i.e.,pseudo-seco.d-order kinetics model)better fitted the release process of sediment nitrogen and phosphorus.The release of nitrogen and phosphorus from sediments is a co.plex process driven by multiple factors,therefore,we tested the influence of three factors(pH,temperature,and disturbance intensity)on the release of nitrogen and phosphorus from sediments in this study.The most amount of nitrate nitrogen(NO_(3)^(–)-N)was released under neutral co.ditions,while the most significant release of ammonia nitrogen(NH_(4)^(+)-N)occurred under acidic and alkaline co.ditions.The release of nitrite nitrogen(NO_(2)^(-)-N)was less affected by pH.The dissolved total phosphorus(DTP)released significantly in the alkaline water environment,while the release of dissolved organic phosphorus(DOP)was more significant in acidic water.The release amount of soluble reactive phosphorus(SRP)increased with an increase in pH.The sediments released nitrogen and phosphorus at higher temperatures,particularly NH_(4)^(+)-N,NO_(3)^(–)-N,and SRP.The highest amount of DOP was released at 15.0℃.An increase in disturbance intensity exacerbated the release of nitrogen and phosphorus from sediments.NH_(4)^(+)-N,DTP,and SRP levels increased linearly with the intensity of disturbance,while NO_(3)^(–)-N and NO_(2)

关键词： sediment nitrogen and phosphorus environmental dynamics pseudo-seco.d-order kinetics model dissolved organic phosphorus(DOP) Urumqi City

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Production Practice of Solid Waste Desulfurizer Disposal in European Metallurgical Furnace

Frontiers of Metallurgical Industry

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Frontiers of Metallurgical Industry 2024年第1期2卷 1-4页

作者： Yong Zhang Song Jin Zhizhong He Iron Works of xinjiang Bayi Iron and Steel co. Ltd.

In order to realize the OY Smelting Furnace disposal of solid waste,municipal waste,form a model of steel enterprises and urban integration,through the production practice of smelting furnace,analyzes the mechanism of solid waste disposal,and proposed the disposal of solid waste desulfurization agent and disposal method:Acco.ding to the theory to guide the actual production process,the test ton of iron with 10-15kg of desulfurizer in the production process does not affect the quality of molten iron and slag quality.

关键词： OY smelting furnace solid waste disposal desulfurizing agent

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