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Rapid prediction of flow and concentration fields in solid-liquid suspensions of slurry electrolysis tanks

International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 2006-2016页

作者： Tingting Lu Kang Li Hongliang Zhao Wei Wang Zhenhao Zhou Xiaoyi Cai fengqin liu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Intelligent Optimized Manufacturing in Mining&Metallurgy Process Beijing 102628China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

Slurry electrolysis(SE),as a hydrometallurgical process,has the characteristic of a multitank series connection,which leads to various stirring conditions and a complex solid suspension *** computational fluid dynamics(CFD),which requires high computing resources,and a combination with machine learning was proposed to construct a rapid prediction model for the liquid flow and solid concentration fields in a SE *** scientific selection of calculation samples via orthogonal experiments,a comprehensive dataset covering a wide range of conditions was established while effectively reducing the number of simulations and providing reasonable weights for each ***,a prediction model of the SE tank was constructed using the K-nearest neighbor *** results show that with the increase in levels of orthogonal experiments,the prediction accuracy of the model improved *** model established with four factors and nine levels can accurately predict the flow and concentration fields,and the regression coefficients of average velocity and solid concentration were 0.926 and 0.937,*** with traditional CFD,the response time of field information prediction in this model was reduced from 75 h to 20 s,which solves the problem of serious lag in CFD applied alone to actual production and meets real-time production control requirements.

关键词： slurry electrolysis solid-liquid suspension computational fluid dynamics K-nearest neighbor algorithm rapid prediction

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Numerical simulation on gas-solid flow during circulating fluidized roasting of bauxite by a computational particle fluid dynamics method

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Particuology 2024年第7期90卷 179-188页

作者： Chengming Xie Rongbin Li Qijin Wei fengqin liu Hongliang Zhao Yongmin Zhang Hong Yong Sohn State Key Laboratory of Green and Low-carbon Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China BGRIMM Technology Group Beijing 100160China State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China Department of Materials Science and Engineering The University of UtahSalt Lake CityUT 84112USA

A full-cycle numerical simulation of a circulating fluidized bed(CFB)by the use of the computational particle fluid dynamics(CPFD)method has been *** effects of the presence or absence of the secondary air,different secondary air positions,and different secondary air ratios on the gas–solid flow characteristics were *** results show that the presence of the secondary air makes a core-annular structure of the velocity distribution of particles in the fluidized bed,which enhances the uniformity of particles’distribution and the stability of *** position and the ratio of the secondary air have a significant impact on the particle distribution,particle flow rate,and gas flow rate in the fluidized *** the secondary air position and ratio are optimal,the particles,particle flow rate,and air flow rate in the CFB are evenly distributed,the gas–solid flow state is good,and the CFB can operate stably.

关键词： Circulating fluidized bed CPFD method Secondary air position Secondary air ratio Gas–solid flow characteristics

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Preparation of lithium-ion battery anode materials from graphitized spent carbon cathode derived from aluminum electrolysis

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International Journal of Minerals,Metallurgy and Materials 2024年第11期31卷 2466-2475页

作者： Zhihao Zheng Mingzhuang Xie Guoqing Yu Zegang Wu Jingjing Zhong Yi Wang Hongliang Zhao fengqin liu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

Graphitized spent carbon cathode(SCC)is a hazardous solid waste generated in the aluminum electrolysis *** this study,a flotation-acid leaching process is proposed for the purification of graphitized SCC,and the use of the purified SCC as an anode material for lithium-ion batteries is *** flotation and acid leaching processes were separately optimized through one-way *** maximum SCC carbon content(93wt%)was achieved at a 90%proportion of−200-mesh flotation particle size,a slurry concentration of 10wt%,a rotation speed of 1600 r/min,and an inflatable capacity of 0.2 m^(3)/h(referred to as FSCC).In the subsequent acid leaching process,the SCC carbon content reached 99.58wt%at a leaching concentration of 5 mol/L,a leaching time of 100 min,a leaching temperature of 85°C,and an HCl/FSCC volume ratio of 5:*** purified graphitized SCC(referred to as FSCC-CL)was utilized as an anode material,and it exhibited an initial capacity of 348.2 mAh/g at 0.1 C and a reversible capacity of 347.8 mAh/g after 100 ***,compared with commercial graphite,FSCC-CL exhibited better reversibility and cycle ***,purified SCC is an important candidate for anode material,and the flotation-acid leaching purification method is suitable for the resourceful recycling of SCC.

关键词： graphitized spent carbon cathode hazardous solid waste flotation acid leaching lithium-ion batteries

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中高级水平二语学习者汉字知识体系的构建——来自汉字构形教学的实践

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国际中文教育（中英文） 2024年第3期9卷 26-35页

作者：刘凤芹青岛大学国际教育学院

中高级水平二语学习者汉字水平与能力远未达预期,与高水平高素质的中文人才培养目标之间尚存在一定差距。本文以汉字的构形理论为指导,对41位三年级来华学历生进行了系统的形符和声符教学实践并辅之以访谈。结果表明,学习者的汉字构形... 详细信息

中高级水平二语学习者汉字水平与能力远未达预期,与高水平高素质的中文人才培养目标之间尚存在一定差距。本文以汉字的构形理论为指导,对41位三年级来华学历生进行了系统的形符和声符教学实践并辅之以访谈。结果表明,学习者的汉字构形知识有限且汉字构件利用水平较低,培养学习者利用汉字构件形成对汉字形、音、义认知与区别的能力,符合学习者实际需求,也是提高其汉字水平的有效路径。为此,需特别加强中低频形符知义的教学,在充分利用声符显性读音信息的同时,挖掘隐性的读音信息。

关键词：中高级水平二语学习者汉字构形知识形符教学声符教学

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PrF_(3)-NdF_(3)-DyF_(3)-LiF electrolyte system for preparation of Pr-Nd-Dy alloy by electrolysis

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Journal of Rare Earths 2022年第6期40卷 996-1001,I0006页

作者： Zhengping Zuo Yubao liu Xin Yang fengqin liu School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China

The application of Pr-Nd-Dy alloy in the field of high-performance Nd-Fe-B permanent magnet materials has great *** composition of the PrF_(3)-NdF_(3)-DyF_(3)-LiF(PND-LiF) electrolyte system used in the production of Pr-Nd-Dy alloys,the distribution of F,Li,RE and other elements in the electrolyte and their occurrence state were studied in this *** effect of temperature and lithium fluoride addition on electrolyte conductivity was revealed using the continuous conductivity cell constant(CVCC) *** thermal analysis method was used to study the influence of lithium fluoride addition on the electrolyte’s liquidus temperature and the optimal process conditions for the production of Pr-Nd-Dy alloy were *** results show that the overall distribution of praseodymium neodymium fluoride and lithium fluoride is uniform in the electrolyte and dysprosium fluoride is distributed between praseodymium-neodymium fluoride and lithium ***-neodymium oxide is embedded in praseodymium neodymium fluoride in spotty *** electrolyte’s conductivity is increased as the temperature and lithium fluoride addition are going up,while the liquidus temperature is going down with increasing lithium fluoride *** best electrolysis process conditions for the PND-LiF system to produce praseodymium neodymium dysprosium alloy are as follows:temperature1050℃ and 15.56 wt% PrF_(3)-62.22 wt% NdF_(3)-11.11 wt% DyF_(3)-11.11 wt% LiF.

关键词： Pr-Nd-Dy alloy Rare-earth electrolytic process Liquidus temperature Electrolyte conductivity

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茶多酚通过抑制NLRP3炎症小体改善脓毒症小鼠的急性肺损伤

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南方医科大学学报 2024年第2期44卷 381-386页

作者：凌旭光徐雯雯庞观来洪旭星刘凤芹李洋南方医科大学南方医院健康管理科广东广州510515 南方医科大学南方医院门诊部广东广州510515 南方医科大学珠江医院消化内科广东广州510280

目的探讨茶多酚(TP)对NLRP3炎症小体的调控作用机制以及其对脓毒症相关急性肺损伤的治疗效用。方法将60只C57BL/6小鼠随机平均分为假手术组(单纯开腹探查盲肠后即关腹)、盲肠结扎穿孔组(开腹暴露并游离盲肠后行盲肠结扎与穿孔操作后关腹... 详细信息

目的探讨茶多酚(TP)对NLRP3炎症小体的调控作用机制以及其对脓毒症相关急性肺损伤的治疗效用。方法将60只C57BL/6小鼠随机平均分为假手术组(单纯开腹探查盲肠后即关腹)、盲肠结扎穿孔组(开腹暴露并游离盲肠后行盲肠结扎与穿孔操作后关腹)以及盲肠结扎穿孔+TP治疗组(盲肠结扎穿孔前1周予TP灌胃),每组20只。建模完成后绘制生存曲线评估各组小鼠对脓毒症打击的耐受情况。测定各组小鼠肺湿/干质量比值、肺组织髓过氧化物酶(MPO)水平,并对肺组织进行HE染色和急性肺损伤评分,评估肺损伤程度。ELISA法测定肺组织内IL-1β、TNF-α及IL-6表达水平;蛋白免疫印迹实验检测肺组织内NLRP3、caspase-1 p10及ASC蛋白表达水平;免疫组化染色测定肺组织内MPO、caspase-8及NLRP3蛋白表达,评估各组小鼠肺内炎症情况。检测肺组织内MDA及H2O2以评估氧化应激水平;免疫荧光共染NLRP3和NOX4蛋白以探讨二者表达及共定位。结果TP治疗组小鼠术后72 h死亡率、小鼠肺湿/干质量比值、肺组织MPO水平以及急性肺损伤评分均较盲肠结扎穿孔组小鼠显著下降(P<0.05);TP治疗组小鼠肺组织内IL-1β、TNF-α及IL-6、NLRP3、caspase-1 p10、ASC等蛋白表达水平亦较盲肠结扎穿孔组小鼠显著降低(P<0.05);氧化应激相关检测结果提示,TP治疗组小鼠肺组织内MDA及H2O2水平较盲肠结扎穿孔组小鼠显著减低(P<0.05);免疫荧光共染则提示TP治疗组小鼠NOX4蛋白与NLRP3蛋白在肺组织内的表达和共定位较盲肠结扎穿孔组小鼠减少。结论TP可通过抑制NLRP3炎症小体相关炎症改善盲肠结扎穿孔诱导的小鼠脓毒症肺损伤,且这一调控机制可能与其对肺组织内氧化应激相关蛋白NOX4的表达抑制相关。

关键词：茶多酚脓毒症急性肺损伤 NLRP3炎症小体氧化应激

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产前超声诊断单纯持续性卵黄动脉1例并文献复习

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中华围产医学杂志 2024年第3期27卷 209-214页

作者：刘凤琴周柳英舒娜叶楠奚级梅电子科技大学医学院附属妇女儿童医院(成都市妇女儿童中心医院)超声科成都611731

目的总结分析胎儿持续性卵黄动脉的超声图像特征及预后。方法回顾性分析2021年12月电子科技大学医学院附属妇女儿童医院(成都市妇女儿童中心医院)诊断的1例单纯胎儿持续性卵黄动脉病例的产前超声图像特征、遗传学检查结果及预后。以“... 详细信息

目的总结分析胎儿持续性卵黄动脉的超声图像特征及预后。方法回顾性分析2021年12月电子科技大学医学院附属妇女儿童医院(成都市妇女儿童中心医院)诊断的1例单纯胎儿持续性卵黄动脉病例的产前超声图像特征、遗传学检查结果及预后。以“持续性卵黄动脉”“Ⅱ型单脐动脉”和“产前超声”为关键词,检索中国知网、维普中文期刊数据库、万方数据库和中华医学期刊全文数据库;以“persistent vitelline artery”“typeⅡsingle umbilical artery”和“prenatal ultrasound”为关键词,检索PubMed、Embase和UpToDate数据库。总结胎儿持续性卵黄动脉的产前超声图像特征及预后。对数据资料采用描述性统计分析。结果(1)病例报告:本例孕23周超声检查时,腹部可见1条异常粗大的血管起源于腹主动脉近肠系膜上动脉,经脐孔与脐静脉并行进入胎盘,彩色多普勒显示类似脐动脉血流频谱;膀胱横切面未见双侧脐动脉,游离段脐带横切面呈“吕”字形。余胎儿结构未见明显异常。遗传学检测未见异常。出生后该患儿(随访至1岁)生长发育未见异常。(2)文献复习:检索到文献5篇(英文文献3篇,中文文献2篇),共4个病例。结合本研究报道的1例,共5例。这5例中,4例未见明显胎儿结构异常,患儿出生后均生长发育良好;1例产前超声提示左肾缺如,心脏大动脉比值异常,父母选择终止妊娠。3例进行了脐带组织病理学检查,其中2例证实持续性卵黄动脉具有明显内膜弹性层,1例可见卵黄管残留。结论胎儿持续性卵黄动脉的产前超声特征为异常血管起源于腹主动脉或肠系膜上动脉,行使脐动脉功能。单纯持续性卵黄动脉预后较好,但目前国内外报道极少。应积累更多病例进一步研究,提高对此类胚胎异常的再认识。

关键词：超声检查,产前单脐动脉脐动脉血管畸形卵黄管

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Research, development and application of compound-vertical-retort technology for magnesium production

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Journal of Magnesium and Alloys 2023年第12期11卷 4724-4736页

作者： Rongbin Li Shaojun Zhang Peixu Yang Jinhui liu fengqin liu School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Material Science and Engineering Zhengzhou UniversityZhengzhouHenan 450001China

This paper comprehensively introduces a new magnesium production technology the compound-vertical-retort technology, involving in the related fundamental researches, core equipment development, working flow, and technical characteristics. Scale-up test and an annual1200-ton-magnesium demonstration-level test was conducted to confirm the rationality, reliability, and advancement of the equipment, system and process design. It is indicated that the new technology solved a series of problems of traditional silicothermic process including adhesion and glaze, short life of retort, low efficiency, high impurity of crystallized magnesium, large heat losses, and poor working environment,making a great technological breakthrough in this field. Representatively, the new well-designed ceramic-lined steel retort serves 2~3 times in life than the normal retorts. The magnesium yield per retort is improved 4~5 times, with purity of >99.8%. The energy consumption in reduction stage is reduced by more than 20%. The mechanical production is fully realized and operating environment is significantly improved.

关键词： Silicothermic process Magnesium Compound retort Vertical retort Mechanization

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Flow zone distribution and mixing time in a Peirce-Smith copper converter

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International Journal of Minerals,Metallurgy and Materials 2022年第1期29卷 70-77页

作者： Hongliang Zhao Jingqi Wang fengqin liu Hong Yong Sohn State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Department of Materials Science and Engineering The University of UtahSalt Lake CityUtah 84112USA

Peirce-Smith copper converting involves complex multiphase flow and *** this work,the flow zone distribution and mixing time in a Peirce-Smith copper converter were investigated in a 1:5 scaled cold *** field distribution,including dead,splashing,and strong-loop zones,were measured,and a dimensionless equation was established to determine the correlation of the effects of stirring and mixing energy with an error of<5%.Four positions in the bath,namely,injection,splashing,strong-loop,and dead zones,were selected to add a hollow salt powder tracer and measure the mixing *** a quartz flux through tuyeres or into the backflow point of the splashing wave through a chute was recommended instead of adding it through a crane hopper from the top of the furnace to improve the slag-making reaction.

关键词： Peirce-Smith converter copper smelting flow fields mixing time cold model experiments

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CO on Cu{001}c(2 × 2)-Pd Studied by High Resolution Electron Energy Loss Spectroscopy

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Chinese Physics Letters 1991年第8期8卷 404-407页

作者： YAO Jun liu Guoliang liu fengqin LÜSihua WU Sicheng Synchrotron Radiation Laboratory Institute of High Energy PhysicsAcademia SinicaBeijing 100039 Department of Physics Yantai UniversityYan tai 264005 Department of Physics Peking UniversityBeijing 100871 Laboratory for Surface Physics Academia SinicaBeijing 100080

The adsorption of CO on Cu{001}c(2 × 2)-Pd surface has been studies by electron energy loss *** 240 K,CO molecules are Linearly bonded on the top of Pd atoms *** 135 K,CO adsorbed both on the top position of Pd and Cu atoms which occupied preferably on Pd top *** possible dissociative adsorption phase of CO,which exists at room temperature,has been discussed also.

关键词： spectroscopy adsorption adsorbed

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