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Recovery of li_(2)CO_(3)and FePO_(4)from spent liFePO_(4)by coupling technics of isomorphic substitution leaching and solvent extraction

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Chinese Journal of Chemical Engineering 2023年第2期54卷 306-315页

作者： Yong Niu Xiaowu Peng jinfeng li Yuze Zhang Fugen Song Dong Shi lijuan li Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Engineering Laboratory for Green Applications of Salt Lakes and Salt DepositsQinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China Qinghai Technology Research and Development Center of Comprehensive Utilization of Salt Lakes Resources Xining 810008China Shanghai Institute of Organic Chemistry Chinese Academy of SciencesShanghai 200032China University of Chinese Academy of Sciences Beijing 100049China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China

Efficient and low-cost recycling of spent lithium iron phosphate(liFePO_(4),LFP)batteries has become an inevitable trend.In this study,an integrated closed-loop recycling strategy including isomorphic substitution leaching and solvent extraction process for spent LFP was proposed.An inexpensive FeCl_(3)was used as leaching agent to directly substitute Fe^(2+)from LFP.99%of li can be rapidly leached in just 30 min,accompanied by 98%of FePO_(4)precipitated in lixivium.The tri-n-butyl phosphate(TBP)-sulfonated kerosene(SK)system was applied to extract li from lixivium through a twelve-stage countercurrent process containing synchronous extraction and stepwise stripping of li^(+)and Fe^(3+).80.81%of li can be selectively enriched in stripping liquor containing 3.059 mol·L^(-1)of li^(+)under optimal conditions.And the Fe stripping liquor was recovered for LFP re-leaching,of which,Fe^(2+)was oxidized to Fe^(3+)by appropriate H_(2)O_(2).Raffinate and lixivium were concentrated and entered into extraction process to accomplished closeloop recycling process.Overall,the results suggest that more than 99%of li was recovered.FeCl_(3)holding in solution was directly regenerated without any pollutant emission.The sustainable mothed would be an alternative candidate for total element recycling of spent LFP batteries with industrial potential.

关键词： Spent liFePO_(4) Leaching lithium Extraction Stripping Recovery

Effect of grain structure on fatigue crack propagation behavior of Al-Cu-li alloys

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Journal of Materials Science & Technology 2023年第17期148卷 75-89页

作者： Dingding Lu Ben lin Tianle liu Sanxi Deng Youjie Guo jinfeng li Danyang liu School of Materials Science and Engineering Central South UniversityChangsha 410083China China Academy of Launch Vehicle Technology Beijing 100076China State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.LTD.Beijing 100088China Key Laboratory of Nonferrous Metal Materials Science and Engineering Ministry of EducationChangsha 410083China

Recrystallization behavior during optimized heat treatments provides a potential to obtain desirable grain structure,which significantly improves the mechanical properties of aluminum alloys.The influence of grain structures on fatigue crack propagation(FCP)behaviors of Al-Cu-li alloy with hot-rolled(HR)and cold-rolled(CR)was investigated.Subgrain boundaries have a significant impact on small crack growth rates,which is reflected in the pronounced fluctuation of fatigue crack growth of HR specimens after solution treatment.Moreover,the specific cellular structure within grains can improve the deformation capacity of alloys due to their accommodation of plastic deformation,which contributes to the lower fatigue crack growth rates and higher threshold values in HR specimens.The intragranular deflection also decelerates the FCP rate and occurs in these regions of large grain without subgrain boundaries.Recrystallization occurs in the CR specimens,resulting in small anisotropy on the fatigue resistance for the different orientations in the Paris stage due to the recrystallization texture.Fatigue cracks can be deflected and tend to propagate along the grain boundaries when it goes into the grain with a relatively low Schmidt factor value.

关键词： Al-Cu-li alloy Fatigue crack propagation Grain structure Microcrack

The effect of model errors in ensemble sequential assimilation of geomagnetic field

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Earth and Planetary Physics 2023年第1期7卷 22-31页

作者： jinfeng li YuFeng lin KeKe Zhang Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyTaipaMacaoChina

Earth’s magnetic field is generated in the fluid outer core through the dynamo process.Over the last decade,data assimilation has been used to retrieve the core dynamics and predict the evolution of the geomagnetic field.The presence of model errors in the geomagnetic data assimilation is inevitable because current numerical geodynamo models are still far from realistic core dynamics.In this paper,we investigate the effect of model errors in geomagnetic data assimilation based on ensemble Kalman filter(EnKF).We construct two dynamo models with different control parameters but exhibiting similar force balance and magnetic morphology at the core surface.We then use one dynamo model to generate synthetic observations and the other as the forward model in EnKF.Our test experiments show that the EnKF approach with the pre-setting model errors can nevertheless recover large-scale core surface flow and make a rough short-term(5-year)prediction.However,the data assimilation in the presence of model errors cannot keep improving the core state even though new observations are available.Motivated by the planned Macao Science Satellite-1,which is expected to provide improved internal geomagnetic field model,we also perform a test experiment using synthetic observations up to spherical harmonic degree l=18.Our results indicate that high-resolution observations are crucial in reconstructing small scale flow.

关键词： geomagnetic field geodynamo data assimilation

Hybrid post-processing effects of magnetic abrasive finishing and heat treatment on surface integrity and mechanical properties of additively manufactured Inconel 718 superalloys

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Journal of Materials Science & Technology 2022年第33期128卷 10-21页

作者： Kun li Ruijin Ma Ming Zhang Wen Chen Xiaobin li David Z.Zhang Qian Tang Lawrence E.Murr jinfeng li Huajun Cao State Key Laboratory of Mechanical Transmission Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Metal Additive Manufacturing(3D Printing) Chongqing UniversityChongqing 400044China College of Engineering Mathematics and Physical SciencesUniversity of ExeterNorth Park RoadExeter EX44QFUK W.M.Keck Center for 3D Innovation University of Texas at El PasoEl PasoTX 79968USA Department of Metallurgical Materials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX 79968USA Institute of Materials China Academy of Engineering PhysicsMianyang 621908China

Desired microstructure and surface integrity are critical to achieving the high performance of additively manufactured components.In the present work,the hybrid post-processes of magnetic abrasive finishing(MAF)and post-heat treatment(HT)were applied to the additively manufactured Inconel718 superalloys.Their hybrid effects and influencing mechanism on the surface quality and mechanical properties of the additively manufactured samples have been studied comparatively.The results show that the MAF process effectively reduces the surface roughness by more than an order of magnitude due to the flexibility and geometric consistency of the magnetic particles and abrasives with the finished surfaces.The proper sequence of MAF and HT obtains enhanced mechanical properties for the homogenized-MAF-aged sample with the yield strength of 1147 MPa,the ultimate tensile strength of 1334 MPa,and the elongation of 22.9%,which exceeds the standard wrought material.The surface integrity,compressive residual stress field,and grain refinement induced by the MAF and subsequent aging heat treatment increase the cracking resistance and delay the fracture failure,which significantly benefits the mechanical properties.The MAF process combined with proper post-heat treatment provides an effective pathway to improve the mechanical properties of additively manufactured materials.

关键词： Magnetic abrasive finishing Additive manufacturing Inconel 718 Microstructure–property relationship Heat treatment

Time-Consistent Asymptotic Exponential Arbitrage with Small Probable Maximum Loss

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Chinese Annals of Mathematics,Series B 2019年第4期40卷 495-500页

作者： jinfeng li School of Management Fudan University

Based on a concept of asymptotic exponential arbitrage proposed by F?llmerSchachermayer, the author introduces a new formulation of asymptotic arbitrage with two main differences from the previous one: Firstly, the realising strategy does not depend on the maturity time while the previous one does, and secondly, the probable maximum loss is allowed to be small constant instead of a decreasing function of time. The main result gives a sufficient condition on stock prices for the existence of such asymptotic arbitrage.As a consequence, she gives a new proof of a conjecture of F?llmer and Schachermayer.

关键词： Asymptotic arbitrage Time-consistent Small probable maximum loss

Stereo Matching Method Based on Space-Aware Network Model

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Computer Modeling in Engineering & Sciences 2021年第4期127卷 175-189页

作者： Jilong Bian jinfeng li College of Information&Computer Engineering Northeast Forestry UniversityHarbin150040China College of Computer&Information Technology Mudanjiang Normal UniversityMudanjiang157011China

The stereo matching method based on a space-aware network is proposed, which divides the network into threesections: Basic layer, scale layer, and decision layer. This division is beneficial to integrate residue network and densenetwork into the space-aware network model. The vertical splitting method for computing matching cost by usingthe space-aware network is proposed for solving the limitation of GPU RAM. Moreover, a hybrid loss is broughtforward to boost the performance of the proposed deep network. In the proposed stereo matching method, thespace-aware network is used to calculate the matching cost and then cross-based cost aggregation and semi-globalmatching are employed to compute a disparity map. Finally, a disparity-post processing method is utilized suchas subpixel interpolation, median filter, and bilateral filter. The experimental results show this method has a goodperformance on running time and accuracy, with a percentage of erroneous pixels of 1.23% on KITTI 2012 and1.94% on KITTI 2015.

关键词： Deep learning stereo matching space-aware network hybrid loss

Nutrient uptake,physiological responses and growth of tobacco(Nicotiana tabacum L.)in soil under composite salt stress

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Pedosphere 2022年第6期32卷 893-904页

作者： Jian CUI Dongrui YAO Jing MA Xiefeng YE Ying PENG Jiaqian SONG jinfeng li Yajun CHANG John YANG Zhen ZHANG Xueli li Xiaojing liU Khalil KARIMAN Institute of Botany Jiangsu Province and Chinese Academy of SciencesNanjing 210014(China) National Tobacco Cultivation and Physiology and Biochemistry Research Center Key Laboratory for Tobacco Cultivation of Tobacco IndustryCollege of Tobacco ScienceHenan Agricultural UniversityZhengzhou 450002(China) Shangluo Tobacco Company Luonan BranchShangluo 726000(China) School of Environmental Science Nanjing Xiaozhuang UniversityNanjing 211171(China) Department of Agriculture and Environmental Science Lincoln University of MissouriJefferson City MO 65201(USA) Staff Development Institute of China National Tobacco Corporation Zhengzhou 450000(China) School of Agriculture and Environment The University of Western AustraliaPerth WA 6009(Australia)

High soil salinity imposes osmotic stress and ion toxicity in plants,leading to substantial crop yield loss worldwide.Understanding of the quantitative and dynamic physiological responses to composite soil salt stress is limited and needs to be expanded.In this study,physiological,nutritional,and biomass yield parameters of tobacco(Nicotiana tabacum L.)grown in soil with five levels of composite soil salinity(CSS),basal CSS level(control,CK)and 3(T_(1)),6(T_(2)),9(T_(3)),and 12(T_(4))times the basal CSS level,under greenhouse were determined at days 30,60,and 90 after transplanting.Leaf dry biomass significantly(Plinity levels applied(T_(1) and T_(2))at all three time points,whereas it progressively declined as the CSS level further increased.The leaf physiological and photosynthetic responses were more adversely affected by CSS at the early growth stage(day 30).A path coefficient analysis demonstrated that leaf proline content had the largest direct effect(-0.66),and leaf Cu content had the most significant indirect effect(0.49)on leaf dry biomass of plants.The results suggest that lower CSS levels(T_(1) and T_(2))could stimulate tobacco growth(leaf biomass yield,in particular),and higher leaf proline and Cu levels at the early growth stage may potentially increase the ability of tobacco plants to withstand the adverse effects of salinity,which could be considered for future research and development of salinity management strategies.

关键词： anti-adversity metabolite composite soil salinity hormone malondialdehyde proline translocation factor

Critical Cooling Rate for the Glass Formation of Ferromagnetic Fe_(80)P_(13)C_7 Alloy

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Acta Metallurgica Sinica(English Letters) 2013年第1期26卷 56-62页

作者： Kai XU Yan WANG jinfeng li Qiang li School of Physics Science and Technology Xinjiang University State Key Laboratory of Powder Metallurgy Central South University

In this paper the critical cooling rate, Rc, for the glass formation of Fe80P13C7 alloy has been determined using both Uhlmann＇s and Barandiaran-Colmenero＇s method. In Uhlmann＇s method, all kinds of the expres-sions of △G^l-s （T） and η/（T） determined using the different modes and methods had been investigated. It is indicated that the Rc for the glass formation of FesoP13C7 alloy can be estimated to be 349 K/s by Uhlmann＇s method based on the appropriate expressions of △G^l-s（T） and η/（T）. The calculated result accords with our experimental result. The Rc for the glass formation of Fe80P13C7 alloy has also been determined to be 0.49 K/s using Barandiaran-Colmenero＇s method. This resultant Rc is unreasonable low and it indicates that Barandiaran-Colmenero＇s method does not suit to Fe-based alloy.

关键词： Glass formation ability Critical cooling rate Fe80P13C7 alloy

Development and evaluation of vinpocetine inclusion complex for brain targeting

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Asian Journal of Pharmaceutical Sciences 2015年第2期10卷 114-120页

作者： Jiaojiao Ding jinfeng li Shirui Mao School of Pharmacy Shenyang Pharmaceutical UniversityShenyang 110016China

The objective of this paper is to prepare vinpocetine(VIN)inclusion complex and evaluate its brain targeting effect after intranasal administration.In the present study,VIN inclusion complex was prepared in order to increase its solubility.Stability constant(Kc)was used for host selection.Factors influencing properties of the inclusion complex was investigated.Formation of the inclusion complex was identified by solubility study and DSC analysis.The brain targeting effect of the complex after intranasal administration was studied in rats.It was demonstrated that properties of the inclusion complex was mainly influenced by cyclodextrin type,organic acids type,system pH and host/guest molar ratio.Multiple component complexes can be formed by the addition of citric acid,with solubility improved for more than 23 times.Furthermore,In vivo study revealed that after intranasal administration,the absolute bioavailability of vinpocetine inclusion complex was 88%.Compared with intravenous injection,significant brain targeting effect was achieved after intranasal delivery,with brain targeting index 1.67.In conclusion,by intranasal administration of VIN inclusion complex,a fast onset of action and good brain targeting effect can be achieved.Intranasal route is a promising approach for the treatment of CNS diseases.

关键词： Vinpocetine Hydroxypropyl-b-cyclodextrin Citric acid Inclusion complex Brain targeting