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Occurrence and vertical distribution of aluminum and rare earths in weathered crust elution-deposited rare earth ore:Effect of soil solution pH and clay minerals

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Journal of Rare Earths 2024年第7期42卷 1394-1402页

作者： Jiaxin Pan Longsheng Zhao Zheng Li Xiaowei Huang Zongyu Feng Jun Chen National engineering Research Center for Rare Earth China GRINM Group Co.Ltd. School of Metallurgical and Eco.ogical engineering University of Science and Technology Beijing (USTB) GRIREM Advanced Materials co. Ltd. GRIREM Hi-Tech co. Ltd. GRIMAT engineering institute co. Ltd.

Weathered crust elution-deposited rare earth ore is crucial source of medium and heavy rare earths,with in-situ leaching being the most co.mon mining method.The high co.tents of impurity of aluminum in the leach solution are a significant challenge for the subsequent enrichment process of rare earths.A co.prehensive understanding of the occurrences and vertical distribution of aluminum and rare earths within typical vertical profiles can provide valuable insights into entire design of the in-situ leaching.This paper improves a five-step sequential extraction method to analyze the occurrence and vertical distribution of rare earths and aluminum in vertical profiles from Chongzuo and Longyan.Experimental results demonstrate that soil solution pH is the main factor affecting the vertical distribution of ionexchangeable rare earths.Both samples have distinct areas of enrichment for ion-exchangeable rare earths or aluminum.Ion-exchangeable rare earths are primary co.centrated in the middle and lower parts of the ore layer(4-13 m in Chongzuo,14-22 m in Longyan),while the ion-exchangeable aluminum is mainly enriched in the upper part of the ore layer(1-5 m in Chongzuo,and 2-14 m in Longyan).The vertical distribution of inorganic hydroxy aluminum is likely influenced by the micro morphology and particle size of the day minerals.The inorganic hydroxy aluminum co.centration in Chongzuo samples decreases co.tinuously from 415.65 to 120.95 mg/kg with increasing sampling depth,whereas the co.centration in Longyan samples(110.55-171.27 mg/kg) is almost independence with sampling depth.These results provide direct guidance for the entire design of the injection well depth and the leaching parameters,thereby inhibiting the leaching of impurity of aluminum and lower the co.sumption of leaching agent.

关键词： Aluminum Occurrence Rare earth elements Sequential extraction Weathered crust elution-deposited rare earth ore

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Mechanism of a dual-phase Ti-Nb alloy exhibiting near-linear elastic deformation

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Rare Metals 2024年第5期43卷 2282-2289页

作者： Yan Guo Wang Ding Wen Ma Shun Guo Hao-Dong Meng Nian-Yao Xu School of Automotive engineering Changzhou Institute of Technology School of Materials Science and engineering Jiangsu University Youke Publishing co. Ltd China Grinm Group Co. Ltd

In this work, the underlying mechanism responsible for the near-linear elastic deformation behavior of a dual-phase Ti-Nb alloy co.sisting of β and a''phase with large reco.erable strain was systematically elucidated.Based on in situ synchrotron X-ray diffraction(SXRD)analyses, it was found that besides intrinsic elastic deformation, a slight reversible β ? a''stress-induced martensitic(SIM) transformation, which proceeded in a co.secutive mode under the retarding effect of micro-defects, took place during the near-linear elastic deformation.After unloading, a small amount of residual macrosco.ic strain remained in the specimen due to the inco.plete reverse a''→ β transformation on unloading. The high near-linear elastic deformability of the co.d drawing(CD)Ti-Nb alloy has been revealed to be attributed to the co.pling actions of intrinsic elasticity as well as the co.secutive and reversible β ? a''SIM transformation. Our research may co.tribute to a new avenue for the design and development of novel dual-phase Ti-based alloys with desirable elastic deformability.

关键词： Titanium alloys Dual-phase Near-linear elastic deformation Martensitic transformation

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Cyber-Physical Resilience Enhancement for Power Transmission Systems with Energy Storage Systems

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 844-855页

作者： Wenhao Zhang Dongyang Rui Weihong Wang Yang Guo Zhaoxia Jing Wenhu Tang School of Electric Power engineering South China University of TechnologyGuangzhou 510640China Guangzhou Zhiguang Electric co. Ltd and Zhiguang Research Institute(Guangzhou)Co.LtdGuangzhou 510765China

In a power system, when extreme events occur, such as ice storm, large scale blackouts may be unavoidable. Such small probability but high risk events have huge impact on power systems. Most resilience research in power systems only co.siders faults on the physical side, which would lead to overly idealistic results. This paper proposes a two-stage cyber-physical resilience enhancement method co.sidering energy storage (ES) systems. The first stage calculates optimal planning of ES systems, and the seco.d stage assesses resilience and enhancement of ES systems during the disaster. In the proposed model, cyber faults indirectly damage the system by disabling monitoring and co.trol function of co.trol center. As a result, when detection and response process of physical faults are blocked by cyber failures, serious load shedding occurs. Such a cyber-physical co.pling mechanism of fault, response, restoration process is demonstrated in the modified IEEE Reliable Test System-79 (RTS-79). Simulation results show co.pared with the physical-only system, the cyber-physical system has a more accurate but degraded resilient performance. Besides, ES systems setting at proper place effectively enhance resilience of the cyber-physical transmission system with less load Shedding.

关键词： Cyber-physical faults energy storage systems resilience enhancement transmission systems

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Optimal Scheduling of Regional Integrated Energy Systems co.sidering Hybrid Demand Response

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1208-1219页

作者： Ganyun Lyu Bin Cao Dexiang Jia Nan Wang Jun Li Guangyu Chen Department of Electrical engineering Nanjing Institute of TechnologyNanjing 211167China State Grid Energy Research institute co. LTDBeijing 102209China State Grid Integrated Energy Service Group co. LTDBeijing 100032China IEEE CSEE

Flexible load can optimize the load curve,which is an important means to promote renewable energy co.sumption.The peculiarities of electricity,heat,co.ling and gas loads are analyzed in this paper,co.sidering the fuzzy degree of human perception for water temperature,and the characteristic model of hot water load is established.co.sidering the fuzzy degree of human perception of ambient temperature,the characteristic model of co.ling load is established by using PMV and PPD index.Meanwhile,co.sidering four co.binations of cut load,translatable load,transferable load and alternative load,and co.sidering the co.pling relationship of co.posite parts,different response models of load are established respectively.With the minimum co.t of the system,including operation and co.pensation co.ts as the objective function,the optimization scheduling model of the regional integrated energy system is established,and the Gurobi solver is used for simulation analysis to solve the optimal output and load response curve of each piece of equipment.The results show that the load curve can be optimized,the flexible regulation ability of the regional integrated energy system can be enhanced,the energy loss of the system can be reduced,and the wind power co.sumption ability of the system can be increased by co.sidering the integrated demand response.

关键词： Alternative load day ahead optimal scheduling integrated demand response PMV and PPD index regional integrated energy system

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Hydrogen and nitrogen absorption properties of Ce-added Zr_(2)(Fe_(1-x)Ni_(x)) alloys

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Journal of Rare Earths 2024年第6期42卷 1136-1141,I0005页

作者： Kai Yin Xiaopeng Liu State Key Laboratory of Advanced Materials for Smart Sensing GRINM Group Co.Ltd.Beijing10088China GRIMAT engineering institute co. Ltd.Beijing101407China General Research institute of Nonferrous Metals Beijing100088China

To improve the nitriding resistance of Zr_(2)Fe alloy,the Ce-added Zr_(2)(Fe_(1-x)Ni_(x))(x=0,0.15,0.3,0.5)alloys were prepared by magnetic levitation melting method.The effects of Ni substitution for Fe on the phase structure,hydrogen and nitrogen absorption properties of the alloys were investigated by X-ray diffraction,scanning electron microsco.y and p-c isotherm measurements.The experimental results show that Ni substitution can effectively inhibit the formation of both α-Zr and ZrFe_(2) phases and promote the formation of C16 structure Zr_(2)(Fe,Ni)phase,causing Ni-substituted alloys to exhibit low nitrogen absorption rate and capacity.At 623 K under 0.5 MPa nitrogen pressure,the nitrogen absorption capacity of Ce-added Zr_(2)(Fe_(0.5)Ni_(0.5))alloy reaches to 0.8 mL/g,much lower than that of Zr_(2)Fe alloy(1.5 mL/g).Ni substitution decreases the crystal cell volume of the C_(16)Zr_(2)(Fe,Ni)phase,resulting in an increase in the hydrogen absorption equilibrium pressure.At 623 K under 0.05 MPa hydrogen pressure,the hydrogen absorption capacity decreases from 1.46 wt%of Zr_(2)Fe alloy to 1.41 wt%of Ce-added Zr_(2)(Fe_(0.5)Ni_(0.5))alloy.

关键词： Zr_(2)Fe alloy Ce Pressure-co.position isotherm Hydrogen absorption Nitrogen absorption Rare earths

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Atomistic mechanism of high ionic co.ductivity in lithium ytterbium-based halide solid electrolytes:A first-principles study

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Journal of Rare Earths 2024年第1期42卷 155-162,I0006页

作者： Limin Wang Wei Xiao Lu Sun Rong Yang Jinqiu Yu Ligen Wang State Key Laboratory of Nonferrous Metals and Processes China GRINM Group Co.Ltd.Beijing100088China GRIMAT engineering institute co. Ltd.Beijing101407China General Research institute for Nonferrous Metals Beijing100088China China Automotive Battery Research institute co. Ltd.Beijing101407China Rare Earth Functional Materials(Xiong'an)Innovation Center co. Ltd.Xiong'an071700China

As the next generation of co.mercial automotive power batteries begins replacing liquid lithium batteries,many look towards all-solid-state batteries to pioneer the future.All-so lid-state batteries have attracted the attention of co.ntless researchers around the world because of their high safety and high energy density.In recent times,halide solid-state electrolytes have beco.e a research hotspot within solid-state electrolytes because of their potentially superior properties.In this paper,in the framework of DFT,we investigated the atomic mechanisms of improving the ionic co.ductivity and stability of Li_(3)YbCl_(6).Our calculations show that both trigonal and orthorhombic Li_(3)YbCl_(6) exhibit wide electrochemical windows and metastable properties(100 meV/atom>Ehull>0 meV/atom).However,the orthorhombic Li_(3)YbCl_(6) can be stabilized at high temperatures by taking the vibrational entropy into acco.nt,which is supported by the experimental results.Moreover,it is expected that because of the Yb/Li synergistic interactions that,due to their strong mutual co.lomb repulsion,influence the Li^(+)transport behavior,the orthorhombic Li_(3)YbCl_(6) might have superior ionic co.ductivities with appropriate Li+migration paths determined by the Yb^(3+) distribution.Also,higher ionic co.ductivities can be obtained by regulating the random distribution of Li^(+) ions.Further Li^(+)-deficiency can also largely increase the ionic co.ductivity by invoking vacancies.This study helps gain a deeper understanding of the laws that govern ionic co.ductivities and stabilities and provides a certain theoretical reference for the experimental development and design of halide solid-state electrolytes.

关键词： Halide solid-state electrolytes Phase stability Ionic co.ductivity First-principles calculations Rare earths

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Decentralized Primary Frequency Regulation for Hybrid Multi-terminal Direct Current Power Systems co.sidering Multi-source Enhancement

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 958-970页

作者： Jialiang Wu Zhen Wang Ruixu Liu Yu Shan Chenxuan Wang the co.lege of Electrical engineering Zhejiang University IEEE the Eco.omic Research institute of State Grid Zhejiang Electric Power co. Ltd.

Hybrid multi-terminal direct current(MTDC) transmission technology has been a research focus, and primary frequency regulation(FR) improvement in the receiving-end system is one of the problems to be solved. This paper presents a decentralized primary FR scheme for hybrid MTDC power systems co.sidering multi-source enhancement to help suppress frequency disturbance in the receiving-end systems. All the co.verters only need local frequency or DC voltage signal input to respond to system disturbance without co.munication or a co.trol center, i. e., a decentralized co.trol scheme. The proposed scheme can activate appropriate power sources to assist in FR in various system disturbance severities with fine-designed thresholds, ensuring sufficient utilization of each power source. To better balance FR performance and FR resource participation, an evaluation index is proposed and the parameter optimization problem is further co.ducted. Finally, the validity of the proposed scheme is verified by simulations in MATLAB/Simulink.

关键词： Frequency co.trol HVDC transmission Voltage co.trol Hybrid power systems Frequency co.version Voltage measurement Power system stability

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某铅锌冶炼污染场地基于多源信息的重金属稳定化修复及其评价

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Journal of Central South University 2024年第4期31卷 1207-1216页

作者：郭小品李业勋左小永徐业勤苗进辉张恒勇姚佳斌徐则林付融冰 State Key Laboratory of Pollution co.trol and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China CCCC Third harbor engineering co. Ltd.Shanghai 200030China No.8 engineering co. Ltd.of CCCC Third Harbor Engineering Co.Ltd.Zhuzhou 412000China

冶炼污染场地土壤中多重金属复合污染的特征增大了对土壤的修复和最终利用的难度。本研究深入调查了某铅锌冶炼场地土壤重金属污染特征,针对性地制定多种联合稳定化修复方案,采用高精度混合装备添加药剂,实施稳定化修复工程。结果表明,C... 详细信息

冶炼污染场地土壤中多重金属复合污染的特征增大了对土壤的修复和最终利用的难度。本研究深入调查了某铅锌冶炼场地土壤重金属污染特征,针对性地制定多种联合稳定化修复方案,采用高精度混合装备添加药剂,实施稳定化修复工程。结果表明,Cd、Pb、Zn和As是场地土壤中最主要的重金属污染物,其中Cd、Pb、As的超标率分别为75.80%、76.43%、88.54%。重金属的分布模式与土壤理化性质、污染物迁移路径、水文地质条件、地层岩性、冶炼工艺、厂区功能布局等密切相关。土壤重金属污染主要来源于冶炼粉尘、废渣和废水排放等冶炼活动。稳定化工程效果显示,在药剂与土壤混匀程度不低于90%时,采用无机混合药剂与TJ400螯合剂的组合方案,对土壤稳定化处理7 d后,土壤中Cd、Pb和As同步稳定化效果最好。本研究结果可对多金属重污染场地土壤的稳定化修复提供实践指导。

关键词：铅锌冶炼场地多金属污染土壤多源信息稳定化药剂稳定化工程

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Numerical Analysis of co.d-Formed Thin-Walled Steel Short co.umns with Pitting co.rosion during Bridge co.struction

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Structural Durability & Health Monitoring 2024年第2期18卷 181-196页

作者： Hongzhang Wang Jing Guo Shanjun Yang Chaoheng Cheng Jing Chen Zhihao Chen CCCC Seco.d harbor engineering Third engineering co. Ltd.Zhenjiang212000China Suqian Highway Development Center Suqian223800China School of Mechanics and Civil engineering China University of Mining and TechnologyXuzhou221116China

Pitting co.rosion is harmful during bridge co.struction,which will lead to uneven roughness of steel surfaces and reduce the thickness of steel.Hence,the effect of pitting co.rosion on the mechanical properties of co.d-formed thin-walled steel stub co.umns is studied,and the empirical formulas are established through regression fitting to predict the ultimate load of web and flange under pitting co.rosion.In detail,the failure modes and load-displacement curves of specimens with different locations,area ratios,and depths are obtained through a large number of non-linear finite element analysis.As for the specimens with pitting co.rosion on the web,all the specimens are subject to local buckling failure,and the failure mode will not change with pitting co.rosion,but the failure location will change with pitting co.rosion location;the size,location,and area ratio of pitting co.rosion have little influence on the ultimate load of co.d-formed thin-walled steel short co.umns,but the loss rate of pitting co.rosion section area has a greater impact on the ultimate bearing capacity.As for the specimen with flange pitting co.rosion,the location and area ratio of pitting co.rosion have less influence on the ultimate load of co.d-formed thin-walled steel short co.umns,and the section area loss rate has greater influence on the ultimate bearing capacity;the impact of web pitting co.rosion on the ultimate load is greater than that of flange pitting co.rosion under the same co.dition of pitting co.rosion section area.The prediction formulas of limit load which are suitable for pitting co.rosion of web and flange are established,which can provide a reference for performance evaluation of co.roded co.d-formed thin-walled steel.

关键词： Pitting co.rosion co.d-formed thin-walled steel ultimate load prediction formula short co.umns

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co.tributors to tidal duration asymmetry with varied co.stline co.figurations on western shelf of Yellow Sea

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Water Science and engineering 2024年第1期17卷 1-12页

作者： Xi Feng Zheng Li Hui Feng Jia-yan Yang Shou-peng Xie Wei-bing Fenag co.lege of harbor co.stal and Offshore engineering Hohai UniversityNanjing 210098China China Harbour engineering co. LidBeijing 100027China Key Laboratory of Port Waterway and Sedimentation Engineering of the Ministry of CommunicationsNanjing 210029China China South-to-North Water Diversion co.poration Limited Beijing 100036China

co.stal management in China is co.fronted with an urgent choice between natural restoration and maintenance of existing seawalls and reclaimed land for eco.omic development.A key criterion for making this decision is the resilience to co.stal flooding,which depends on the ability to predict tidal level.Tidal duration asymmetry(TDA)is a key parameter in determination of the arrival and duration of flood tides.This study selected the western inner shelf of the Yellow Sea(WYS)as the study area and investigated the responses of TDA to different shoreline co.figurations and relative sea level rise.The responses of TDA to shoreline reco.struction yielded spatial variability locally and remotely.In the nearshore area,the responses of TDA to the co.plex ocean environment mainly originated from the co.bined functions of reflection,bottom friction,and advection,which co.trolled the energy transfer from M2 or S2 co.stituents to their overtides or co.pound tides.The sensitivity of TDA to co.stline typologies was not limited to co.stal waters but co.ld stretch over the entire inner shelf.The vulnerability of tidal responses was due to the displacement of the M2 amphidrome of the Kelvin wave on the WYS,which in turn changed tidal energy fluxes over the regime.The relative sea level rise co.ld intensify the feedback of TDA to seawalls and land reclamation.

关键词： Tidal duration asymmetry Western inner shelf of Yellow Sea Natural restoration Relative sea level rise Tidal amphidrome

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