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Influence of oxygen-rich hot air composite gas medium on sintering performance and function mechanism

Journal of Iron and Steel Research(International) 2024年第5期31卷 1071-1081页

作者： Min Gan Hao-xiang Zheng Xiao-hui Fan Zhi-yun Ji Qiang Li Ming Wu Yi-fan Wang Xiao-long Wang Yu-feng Wu Xu-ling Chen Zeng-qing Sun Xiao-xian Huang School of Minerals Processing and Bioengineering Central South UniversityChangsha410083HunanChina Shanxi Taigang Stainless Steel Co. Ltd.Taiyuan030003ShanxiChina

Hot air sintering technology is used to improve the quality and production efficiency of sintered ore.However,the current thick layer condition highlights the disadvantage of the low oxygen potential of the hot air sintering layer.Therefore,it is considered to use oxygen enrichment sintering to improve the environment of hot air sintering.Traditional sintering,hot air sintering,and oxygen-rich hot air sintering were compared through sintering cup experiments,and the influence of hot air and oxygen-rich hot air on sintering indexes was clarified.Hot air reduced the vertical sintering velocity,while improved the yield and tumbler index.Oxygen-rich hot air sintering contributed to improving the vertical sintering velocity while ensuring the quality of sintered ore,thus comprehensively improving production efficiency.Under the action of hot air,the highest temperature of the sintering layer increased and the high-temperature holding time was prolonged.After oxygen enrichment,the combustion efficiency of fuels in the upper layer of materials was promoted,which optimized heat distribution in the middle and lower layers of materials and increased the content of calcium ferrite in the sintered ore,thus strengthening the sintering process.

关键词： Iron ore sintering Hot air sintering Oxygen enrichment function mechanism

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Fluoridation routes,function mechanism and application of fluorinated/fluorine-doped nanocarbon-based materials for various batteries:A review

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Journal of Energy Chemistry 2023年第10期85卷 363-393,I0011页

作者： Weicui Liu Nanping Deng Gang Wang Ruru Yu Xiaoxiao Wang Bowen Cheng Jingge Ju Weimin Kang State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes School of Textile Science and EngineeringTiangong UniversityTianjin 300387China School of Material Science and Engineering Tiangong UniversityTianjin 300387China

With the popularity and widespread applications of electronics,higher demands are being placed on the performance of battery materials.Due to the large difference in electronegativity between fluorine and carbon atoms,doping fluorine atoms in nanocarbon-based materials is considered an effective way to improve the performance of used battery.However,there is still a blank in the systematic review of the mechanism and research progress of fluorine-doped nanostructured carbon materials in various batteries.In this review,the synthetic routes of fluorinated/fluorine-doped nanocarbon-based(CF_x)materials under different fluorine sources and the function mechanism of CF_x in various batteries are reviewed in detail.Subsequently,judging from the dependence between the structure and electrochemical performance of nanocarbon sources,the progress of CF_x based on different dimensions(0D–3D)for primary battery applications is reviewed and the balance between energy density and power density is critically discussed.In addition,the roles of CF_x materials in secondary batteries and their current applications in recent years are summarized in detail to illustrate the effect of introducing F atoms.Finally,we envisage the prospect of CF_x materials and offer some insights and recommendations to facilitate the further exploration of CF_x materials for various high-performance battery applications.

关键词： Nanocarbon materials Fluorinated/fluorine-doped effect function mechanism Various batteries

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Mineralization characteristics of pellets prepared by ultrafine magnetite concentrate:influence on metallurgical property and improving method

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Journal of Iron and Steel Research(International) 2023年第3期30卷 446-455页

作者： Xiao-hui Fan Zhi-an Zhou Shu Wang Min Gan Zhi-yun Ji Xu-ling Chen Zhi-yuan Tian School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina Northern Engineering and Technology Corporation MCCDalian 116600LiaoningChina

The reducing property of pellets prepared by ultrafine magnetite concentrate(UMC)and improving method were revealed.The results show that the reduction degree of UMC pellets is only about 56%compared with that of pellets prepared from ordinary iron ore concentrate with relatively coarse particle size,which is significantly lower than the general reduction degree of about 70%.When the composite binder composed of bentonite and organic binder was added,the reduction degree was significantly increased to 69.66%.The revealed mechanism shows that the reduced pellets with common bentonite have a concentric structure,the oxidation gap between the inner and outer layers is obvious,and the outer dense oxide layer hinders the oxidation and reduction of the inner layer.After adding the composite binder,the organic components significantly improved the internal porosity of the pellets and the aggregation degree of ultrafine iron ore concentrate particles in the granulation process,forming a porous structure.The non-uniform double-layer structure is eliminated,and the increased pores are conducive to the internal diffusion of CO,and finally the reduction degree of pellets is increased to the level equivalent to that of ordinary magnetite pellets.

关键词： Ultrafine magnetite concentrate Mineralization characteristics Reduction degree Improving method function mechanism

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基于扎根理论的西部物流集群中横向物流协同制约因素及作用机制研究

物流管理

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物流管理 2019年第12期

作者：张晓燕孙志忠胡娟

物流集群是物流业降本增效的重要形式，本质是其内部相互竞争的企业之间的物流协同。但企业在开展协同活动时，却受到诸多制约因素的影响。文章通过对中国西部7个大型物流集群的管理方、企业代表以及相关的政府官员、专家、学者等进行... 详细信息

物流集群是物流业降本增效的重要形式，本质是其内部相互竞争的企业之间的物流协同。但企业在开展协同活动时，却受到诸多制约因素的影响。文章通过对中国西部7个大型物流集群的管理方、企业代表以及相关的政府官员、专家、学者等进行半结构化深度访谈，借助扎根理论研究方法进行编码分析，构建出由“协同环境”“合作伙伴”“信任”“信息系统”四个主范畴共同构成的“横向物流协同制约因素”模型，并编制故事线，说明它们之间的逻辑关系。制约因素“作用机制”模型揭示了上述制约因素在计划、实施和评估阶段的内在联系与相互影响。在此基础上，针对性地提出相应对策与建议，以便消除阻力，推动协同，促进物流集群的发展和中国西部物流业的转型升级。

关键词：物流集群横向物流协同扎根理论制约因素作用机制　　logistics cluster Horizontal Logistics Collaboration(HLC) Grounded Theory(GT) constraints function mechanism

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旅游参与过程中社区精英的成长与流动研究

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民族问题研究 2020年第3期

作者：黄凯洁

当前，我国乡村治理面临的一大困境是本地能人精英的流失和缺乏。“边少穷”乡村地区如何培养本土精英，进而实现乡村的有效治理和全面振兴，是学界亟待解决的问题。已有实践证明，旅游开辟了乡村个体向精英流动的本土化路径，但现有研... 详细信息

当前，我国乡村治理面临的一大困境是本地能人精英的流失和缺乏。“边少穷”乡村地区如何培养本土精英，进而实现乡村的有效治理和全面振兴，是学界亟待解决的问题。已有实践证明，旅游开辟了乡村个体向精英流动的本土化路径，但现有研究对其作用过程关注较少。当下，我国乡村旅游对社区精英社会流动的作用，可以从制度主义、结构主义和“机会—流动”三个视角进行解读，从而弥补相关研究将旅游简单视为市场经济力量的不足，丰富和强化对旅游作为乡土社会个体社会流动新路径的理解。

关键词：社区旅游社区精英社会流动作用机制　　community tourism community elite social mobility function mechanism

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