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Mineralogical properties and co-sintering characteristics of fluxed iron ore with magnetite concentrates

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 Ecological 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 concentrates, the mineralogical properties of a novel fluxed iron ore were studied using particle size analysis, microscopic 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 combined with the feasibility analysis. Test and experimental results show that the fraction of the fluxed iron ore particles larger than 0.5 mm can account for more than 48%, and the particles have two morphologies: spherical-rough and flaky-smooth. Ca elements are found in the form of calcite (CaCO3) and dolomite (CaMg(CO3)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 concentrates. 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 concentrate Granulation performance Sintering characteristics Gray relation analysis

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O_(2) adsorption on Fe_(3)O_(4) (110) surface and effect of gangue element Al doping: combined study of binding experiment and ab initio molecular dynamics

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Journal of Iron and Steel Research(International) 2024年第4期31卷 810-827页

作者： Zheng-jian Liu Hui-qing jiang Yao-zu Wang jian-liang Zhang Hong-mei Qiao An-yang Zheng Fang-yu Guo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Intelligence Science and Technology University of Science and Technology BeijingBeijing 100083China Beijing Shougang Co. Ltd.Qian'an 064404HebeiChina Department of Physics National University of Defense TechnologyChangsha 410128HunanChina

At high temperature,the chemical reaction mechanism at the interface of magnetite and the influence mechanism of gangue element Al on the oxidation performance of magnetite are not clear.In addition,due to the limitation of existing experimental equipment,it is difficult to clarify the interface reaction mechanism in the oxidation process and the influence mechanism of Al on the surface oxidation reaction of Fe_(3)O_(4) at an atomic scale at high temperature.The surface oxidation reaction mechanism of magnetite and the influence mechanism of Al on the oxidation of magnetite were studied by experiments and AIMD(ab initio molecular dynamics).The experimental results show that the existence of Al_(2)O_(3) will reduce the initial oxidation temperature and comprehensive oxidation performance of magnetite.The AIMD results show that aluminum can accelerate the interface reaction rate of Fe_(3)O_(4) in the high-temperature oxidation atmosphere,but the strong Al-O binding ability is not conducive to the transfer of O atoms in the oxidation process.

关键词： Ironmaking Magnetite oxidation Interface reaction Adsorption-Gangue aluminum AIMD

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COVID-19 pandemic amplified mortality rates among adolescents with bipolar disorder through family-related factors

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World Journal of Clinical Cases 2024年第11期12卷 1929-1935页

作者： Zhuo-Fan Ye Yi-Han Hong jian-Lin yang Meng-Qing Tan Ju-Min Xie zu-Cai Xu Department of Neurology The Affiliated Hospital of Zunyi Medical UniversityZunyi 563000Guizhou ProvinceChina Hubei Key Laboratory of Renal Disease Occurrence and Intervention Medical SchoolHubei Polytechnic UniversityHuangshi 435003Hubei ProvinceChina Psychological Children's Ward Mental Health Center of HuangshiHuangshi 435111Hubei ProvinceChina The Collaborative Innovation Center of Tissue Damage Repair and Regeneration Medicine Zunyi Medical UniversityZunyi 563000Guizhou ProvinceChina

BACKGROUND Recently,a growing number of adolescents have been afflicted with mental disorders,with annual morbidity rates on the rise.This trend has been exacerbated by the global coronavirus disease 2019(COVID-19)pandemic,leading to a surge in suicide and self-harm rates among this demographic.AIM To investigate the impact of the COVID-19 pandemic on adolescent bipolar disorder(BD),along with the underlying factors contributing to heightened rates of suicide and self-harm among adolescents.METHODS A comprehensive statistical analysis was conducted utilizing clinical interviews and self-reports obtained from patients or their guardians.Diagnostic criteria for BDs were based on the Diagnostic and statistical manual of mental disorders,international classification of diseases-11,and the National institute of mental health research domain criteria.Statistical analyses were performed using SPSS 26.0 software,with significance set at P<0.05.RESULTS A cohort of 171 adolescents diagnosed with BD between January 1,2018,and December 31,2022,was included in the analysis.The gender distribution was 2.8:1(female to male),with ages ranging from 11 to 18 years old.Major factors contributing to adolescent BDs included familial influences,academic stress,genetic predisposition and exposure to school-related violence.Notably,a significant increase in suicide attempts and self-harm incidents was observed among adolescents with BD during the COVID-19 pandemic.Statistical analysis indicated that the pandemic exacerbated familial discord and heightened academic stress,thereby amplifying the prevalence of suicidal behavior and self-harm among adolescents.CONCLUSION The COVID-19 pandemic has exacerbated familial tensions and intensified the incidence of suicide and self-harm among adolescents diagnosed with BD.This study underscores the urgent need for societal,familial and educational support systems to prioritize the well-being of adolescents and offers valuable insights and guidelines for the prevention,diagnosis and treatment of ad

关键词： Adolescents Bipolar disorder COVID-19 Suicide Self-harm

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High-yield production of porous carbon spheres derived from enzymatic hydrolysis lignin for zinc ion hybrid capacitors

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Frontiers of Chemical Science and Engineering 2024年第2期18卷 127-136页

作者： Tao Huang Xihong zu jianhui Ma Wenbin jian Xueqing Qiu Wenli Zhang Guangdong Provincial Key Laboratory of Plant Resources Biorefinery School of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhou 510006China School of Advanced Manufacturing Guangdong University of TechnologyJieyang 522000China Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory(Rongjiang Laboratory) Jieyang 515200China

The widespread implementation of supercapacitors is hindered by the limited energy density and the pricey porous carbon electrode materials.The cost of porous carbon is a significant factor in the overall cost of supercapacitors,therefore a high carbon yield could effectively mitigate the production cost of porous carbon.This study proposes a method to produce porous carbon spheres through a spray drying technique combined with a carbonization process,utilizing renewable enzymatic hydrolysis lignin as the carbon source and KOH as the activation agent.The purpose of this study is to examine the relationship between the quantity of activation agent and the development of morphology,pore structure,and specific surface area of the obtained porous carbon materials.We demonstrate that this approach significantly enhances the carbon yield of porous carbon,achieving a yield of 22%in contrast to the conventional carbonization-activation method(9%).The samples acquired through this method were found to contain a substantial amount of mesopores,with an average pore size of 1.59 to 1.85 nm and a mesopore ratio of 25.6%.Additionally,these samples showed high specific surface areas,ranging from 1051 to 1831 m2·g^(−1).Zinc ion hybrid capacitors with lignin-derived porous carbon cathode exhibited a high capacitance of 279 F·g^(−1) at 0.1 A·g^(−1) and an energy density of 99.1 Wh·kg^(−1) when the power density was 80 kW·kg^(−1).This research presents a novel approach for producing porous carbons with high yield through the utilization of a spray drying approach.

关键词： enzymatic hydrolysis lignin porous carbon spheres spray drying zinc ion hybrid capacitors

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Interface interaction between SiO_(2) and magnetite under high temperature:particle migration and inhibition mechanism

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Journal of Iron and Steel Research(International) 2024年第3期31卷 561-572页

作者： Yao-zu Wang jian-liang Zhang Qiang Cheng Hui-qing jiang Zheng-jian Liu Yu-bo Tan School of Intelligent Science and Technology University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Advanced Engineering University of Science and Technology BeijingBeijing 100083China

Silicon is one of the main gangue components in iron ore,usually in the form of quartz and olivine.Numerous studies have shown that SiO_(2) has a two-sided effect on the consolidation of pellets during high-temperature oxidation roasting of magnetite.However,it is very difficult to capture the structural evolution and migration mechanisms during high-tem-perature roasting process by existing experimental methods.Therefore,the influence of SiO_(2) on the consolidation behavior of magnetite was studied through a series of roasting experiments and molecular dynamic simulation.The results show that the consolidation index and particle growth index decrease with the increase in SiO_(2) content in the particles.At 1573 K,the liquid phase promotes the recrystallization growth of hematite at high temperature.Molecular dynamic study shows that it is difficult for quartz SiO_(2) to form sintering neck with Fe_(2)O_(3).When the calcination temperature is higher than 1400 K,the Fe_(2)O_(3)-Fe_(2)SiO_(4) system produces a considerable sintering neck structure after relaxation.The atomic migration ability of Fe_(2)SiO_(4) is much higher than that of Fe_(2)O_(3).The higher atomic migration ability of Fe_(2)SiO_(4) is the main reason for the formation of the sintering neck.

关键词： Sintering neck Crystal growth Consolidation Molecular dynamics SiO_(2)

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Proposing a machine learning approach to analyze and predict basic high-temperature properties of iron ore fines and its factors

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Journal of Iron and Steel Research(International) 2024年第5期31卷 1082-1094页

作者： Qing-ke Sun Yao-zu Wang jian-liang Zhang Zheng-jian Liu Le-le Niu Chang-dong Shan Yun-fei Ma Institute of Artificial Intelligence University of Science and Technology BeijingBeijing100083China School of Intelligence Science and Technology University of Science and Technology BeijingBeijing100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China

The basic high-temperature properties of iron ore play a crucial role in optimizing sintering and ore blending,but the testing process for these properties is complex and has significant lag time,which cannot meet the actual needs of ore blending.A prediction model for the basic high-temperature properties of iron ore fines was thus proposed based on a combination of machine learning algorithms and genetic algorithms.First,the prediction accuracy of different machine learning models for the basic high-temperature properties of iron ore fines was compared.Then,a random forest model optimized by genetic algorithms was built,further improving the prediction accuracy of the model.The test results show that the random forest model optimized by genetic algorithms has the highest prediction accuracy for the lowest assimilation temperature and liquid phase fluidity of iron ore,with a determination coefficient of 0.903 for the lowest assimilation temperature and 0.927 for the liquid phase fluidity after optimization.The trained model meets the fluctuation requirements of on-site testing and has been successfully applied to actual production on site.

关键词： Iron ore Basic high-temperature property Machine learning Random forest Genetic algorithm

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Co-alteration of Myc and RTK-RAS pathways defines a liver-metastatic propensity and immune-cold subgroup of pancreatic adenocarcinoma

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Genes & Diseases 2024年第3期11卷 47-50页

作者： Yuyuan Zhang Ziyang zu Hui Xu Siyuan Weng Yuqing Ren Quan Cheng Peng Luo jian Zhang Zaoqu Liu Xinwei Han Department of Interventional Radiology The First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenan450052China Interventional Institute of Zhengzhou University ZhengzhouHenan450052China Interventional Treatment and Clinical Research Center of Henan Province ZhengzhouHenan 450052China Department of Hepatobiliary and Pancreatic Surgery The First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenan 450052China Department of Respiratory and Critical Care Medicine The First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenan450052China Department of Neurosurgery Xiangya HospitalCentral South UniversityChangshaHunan 410008China Department of Oncology Zhujiang HospitalSouthern Medical UniversityGuangzhouGuangdong 510280China

Co-altered pathways refer to the phenomenon where multiple biological pathways exhibit aberrant changes simultaneously within the same tumor sample.This phenomenon can facilitate a better understanding of the mechanism and evolution of tumors and serve as a biological marker for diagnosing,classifying,and treating tumors.1 However,the nature of alteration occurrence and the impact on pancreatic adenocarcinoma(PAAD)remain elusive.The SELECT algorithm was originally designed to systematically assess the evolutionary dependencies and their impact between altered genes in cancer for anticipating drug resistance and proposing alternative strategies.Here,to better characterize the etiology of PAAD and develop an improved risk assessment strategy,2 by utilizing SELECT,we identified a co-altered pathway subgroup of PAAD that demonstrated an elevated risk for unfavorable prognosis,a propensity for liver metastasis,and an immunologically cold microenvironment.

关键词： adenocarcinoma elevated alteration

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Dinitrophenyl-oxadiazole compounds:Design strategy,synthesis,and properties of a series of new melt-cast explosives

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Defence Technology（防务技术） 2024年第5期35卷 100-107页

作者： Bao-long Kuang Ting-wei Wang Cong Li Mou Sun Qamar-un-Nisa Tariq Chao Zhang Zhi-ming Xie zu-jia Lu jian-guo Zhang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China China Wuzhou Engineering Group CO. LTD.Beijing 100053China

Melt-cast explosives are the most widely used energetic materials in military composite explosives,researchers have been unremittingly exploring high-energy and insensitive melt-cast explosives.In this work,a series of dinitrophenyl-oxadiazole compounds were designed and prepared.These compounds have an ideal low melting point(80-97℃),good detonation performance(detonation velocity D=6455-6971 m/s,detonation pressure P=18-19 GPa)and extreme insensitive nature(impact sensitivity≥60 J,friction sensitivity>360 N).All these compounds were well characterized by nuclear magnetic resonance,fourier transform infrared spectroscopy,elemental analysis.Compounds 2,3 were unambiguously confirmed by X-ray single crystal diffraction analysis.As a result,their overall properties are superior to traditional melt-cast explosives trinitrotoluene(TNT)and dinitroanisole(DNAN)which may have excellent potential applications in insensitive melt-cast explosives.

关键词： Dinitrophenyl-oxadiazole Melt-cast explosive Low sensitivity

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What are the changes in the hotspots and frontiers of microRNAs in hepatocellular carcinoma over the past decade?

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World Journal of Clinical Oncology 2024年第1期15卷 145-158页

作者： Lu Zhang zu-Yuan Chen Xiao-Xian Wei jian-Di Li Gang Chen Department of Pathology The First Affiliated Hospital of Guangxi Medical UniversityNanning 530021Guangxi Zhuang Autonomous RegionChina

BACKGROUND Emerging research suggests that microRNAs(miRNAs)play an important role in the development of hepatocellular carcinoma(HCC).A comprehensive analysis of recent research concerning miRNAs in HCC development could provide researchers with a valuable reference for further studies.AIM To make a comprehensive analysis of recent studies concerning miRNAs in HCC.METHODS All relevant publications were retrieved from the Web of Science Core Collection database.Bibliometrix software,VOSviewer software and CiteSpace software were used to visually analyze the distribution by time,countries,institutions,journals,and authors,as well as the keywords,burst keywords and thematic map.RESULTS A total of 9426 publications on this topic were found worldwide.According to the keywords analysis,we found that the studies of miRNAs focused on their expression level,effects,and mechanisms on the biological behaviour of HCC.Keywords bursting analysis showed that in the early years(2013–2017),“micro-RNA expression”,“gene expression”,“expression profile”,“functional polymorphism”,“circulating microRNA”,“susceptibility”and“mir 21”started to attract attention.In the latest phase(2018–2022),the hot topics turned to“sorafenib resistance”,“tumor microenvironment”and so on.CONCLUSION This study provides a comprehensive overview of the role of miRNAs in HCC development based on bibliometric analysis.The hotspots in this field focus on miRNAs expression level,effects,and mechanisms on the biological behavior of HCC.The frontiers turned to sorafenib resistance,tumor microenvironment and so on.

关键词： miRNA Hepatocellular carcinoma Bibliometric VOSviewer CiteSpace

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Optimization of ECAP-RAP process for preparing semisolid billet of 6061 aluminum alloy

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International Journal of Minerals,Metallurgy and Materials 2020年第6期27卷 792-800页

作者： zu-jian yang Kai-kun Wang Yan yang School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization Jinchang 737100China

6061 aluminum alloy semisolid billet was prepared by the equal-channel angular processing(ECAP)-recrystallization and partial(RAP)process(a combination of equal-channel angular processing and recrystallization and partial remelting).The effects of different process parameters on the alloy microstructure were studied and the quantitative relationship between the process parameters and microstructure was established by response surface methodology(RSM)to optimize the process parameters.According to the orthogonal test,the holding temperature and holding time of the four ECAP-RAP process parameters were found to have the greatest impact on the microstructural characteristics,including average grain size and average shape factor.Through RSM,it was also found that when the average grain size or the average shape factor is optimized separately,another will be degraded.When the two indexes were simultaneously considered,the optimal process parameters were found to be a holding temperature of 623°C and holding time of 13 min,and the corresponding average grain size and average shape factor were 35.97μm and 0.8535,respectively.Moreover,comparing the experimental and predicted values,the reliability of the established response surface model was verified.

关键词： 6061 aluminum alloy equal-channel angular pressing semisolid microstructure response surface methodology

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