检索结果-南通市图书馆

同方期刊数据库

A review on vanadium extraction techniques from major vanadium-containing resources

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第9期43卷 4115-4131页

作者： Yin-Hui Wang Yi-Fan Wang Yu-Ting Li Chang Wu Xiu-Li Han Ning-Ning Zhao Ze-Kun Zhang Lei Dai Ling Wang Zhang-Xing He College of Mining engineering North China University of Science and Technology Collaborative Innovation Center of Green Development and Ecological Restoration of mineral resources College of Chemical engineering North China University of Science and Technology

The critical role of vanadium in metallurgy and the increasing commercialization of vanadium redox flow batteries have contributed to a rise in market demand for vanadium, emphasizing the need to ensure the sustainability of vanadium production. Converter vanadium slag and stone coal, generated during the smelting process of vanadium–titanium magnetite, serve as primary raw materials for vanadium extraction. This paper reviews the process mineralogy of converter vanadium slag and stone coal, encompassing the chemical and physical phase compositions of the raw materials and the state of vanadium occurrence. The aim is to establish a theoretical foundation for the mechanistic study of the vanadium extraction techniques and to provide a reference for the optimization of the process afterward. This paper systematically summarizes the current vanadium extraction technology from converter vanadium slag, covering roasting,direct leaching, sub-molten salt method, and the technology and research status of vanadium extraction from stone coal. Most importantly, it identifies key issues in the current vanadium extraction techniques and challenges faced in actual production, based on the analysis of the current vanadium extraction process and mechanism research. The forward feasibility and prospects for the development of vanadium extraction technology are outlined.

关键词： Vanadium

Thermodynamic theory of flotation for a complex multiphase solid -liquid system and high-entropy flotation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of minerals,Metallurgy and Materials 2024年第6期31卷 1177-1197页

作者： Shuming Wen State Key Laboratory of Complex Nonferrous Metal resources Clean Utilization Faculty of Land Resource EngineeringKunming University of Science and TechnologyKunming 650093China

The flotation of complex solid–liquid multiphase systems involve interactions among multiple components,the core problem facing flotation ***,the combined use of multicomponent flotation reagents to improve mineral flotation has become an important issue in studies on the efficient use of refractory mineral ***,studying the flotation of complex solid–liquid systems is extremely difficult,and no systematic theory has been developed to *** addition,the physical mechanism associated with combining reagents to improve the flotation effect has not been unified,which limits the development of flotation theory and the progress of flotation *** this study,we applied theoretical thermodynamics to a solid–liquid flotation system and used changes in the entropy and Gibbs free energy of the reagents adsorbed on the mineral surface to establish thermodynamic equilibrium equations that de-scribe interactions among various material components while also introducing adsorption equilibrium constants for the flotation reagents adsorbed on the mineral *** homogenization effect on the mineral surface in pulp solution was determined using the chemical potentials of the material components of the various mineral surfaces required to maintain *** flotation effect can be improved through synergy among multicomponent flotation reagents;its physical essence is the thermodynamic law that as the number of compon-ents of flotation reagents on the mineral surface increases,the surface adsorption entropy change increases,and the Gibbs free energy change of adsorption *** to the results obtained using flotation thermodynamics theory,we established high-entropy flotation theory and a technical method in which increasing the types of flotation reagents adsorbed on the mineral surface,increasing the adsorption entropy change of the flotation reagents,decreasing the Gibbs free energy change,and improving the adsorption efficiency

关键词： multicomponent flotation reagent adsorption entropy change equations of thermodynamic equilibrium adsorption equilibri-um constant high-entropy flotation

维普期刊数据库

Hard carbon for sodium storage:Mechanism and performance optimization

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第7期17卷 6038-6057页

作者： Yongxin Wang Meng Li Yu Zhang Naiqing Zhang State Key Laboratory of Urban Water resource and Environment School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China School of Energy Science and engineering Harbin Institute of TechnologyHarbin 150001China

Due to the shortage of lithium resource reserves and the pressure of rising prices,sodium-ion batteries have regained the attention of the public,and shown great potential for application in the fields of grid energy storage and low-speed vehicles to achieve the purpose of complementing lithium-ion batteries,so it is imperative to promote the commercial application of sodiumion *** sodium-ion battery anode materials,hard carbon is the material most likely to be used ***,there is still much work to be done before its *** review provides a comprehensive overview of the current research status from the following three ***,the microstructure and sodium storage active sites of hard carbon are ***,the mechanism of sodium storage in hard carbon is investigated,which can be broadly categorized into four model,“insertion–filling”,“adsorption–insertion”,“adsorption–filling”,and“multistage”.Finally,from the perspective of improving the electrochemical performance of hard carbon,the performance improvement strategies proposed in recent years are *** with the performance of hard carbon commercial products of some enterprises,the future development goal of hard carbon is prospected,hoping that all sectors of society can work hard for this common goal.

关键词： sodium-ion battery hard carbon mechanism performance optimization

An SDN-Based Algorithm for Caching,Routing,and Load Balancing in ICN

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Communications 2024年第5期21卷 64-76页

作者： MohammadBagher Tavasoli Hossein Saidi Ali Ghiasian department of Electrical and Computer engineering Isfahan University of TechnologyIsfahanIran department of technology and engineering Shahrekord UniversityShahrekordIran

One of the challenges of Informationcentric Networking(ICN)is finding the optimal location for caching content and processing users’*** this paper,we address this challenge by leveraging Software-defined Networking(SDN)for efficient ICN *** achieve this,we formulate the problem as a mixed-integer nonlinear programming(MINLP)model,incorporating caching,routing,and load balancing *** explore two distinct scenarios to tackle the ***,we solve the problem in an offline mode using the GAMS environment,assuming a stable network state to demonstrate the superior performance of the cacheenabled network compared to non-cache ***,we investigate the problem in an online mode where the network state dynamically changes over *** the computational complexity associated with MINLP,we propose the software-defined caching,routing,and load balancing(SDCRL)algorithm as an efficient and scalable *** evaluation demonstrates that the SDCRL algorithm significantly reduces computational time while maintaining results that closely resemble those achieved by GAMS.

关键词： in-network caching information-centric network power efficiency routing software-defined networking

维普期刊数据库

Precise gradient separation of nanoparticles using reduced graphene oxide-polyoxomolybdate membranes

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年

作者： Yixin Yang Wanlei Zhao Ruoxuan Zheng Hongqiang Li Wei Chen Yufei Song State Key Laboratory of Chemical resource engineering Beijing University of Chemical Technology Quzhou Institute for Innovation in resource Chemical engineering

The purification and size sieving of nanoparticles（NPs） represents a significant scientific ***,the rGOpolyoxometalates(POMs=PMo12,Mo132and Mo368) membranes were fabricated successfully via a simple and scalable POMsassisted in-situ photoreduction *** the mass ratio of rGO to PMo12was 1:30,the resultant rGO-PMo12membranes with highly ordered and uniform nanochannels of 1.0 nm can be obtained,which showed an accurate carbon quantum dots（CQDs） separation with a cut-off size approximately 1.0 *** increase of the size of the interlayered POMs from PMo12（1.0 nm）,{Mo132}（2.9 nm） to {Mo368}（3.8 nm）,the resultant rGO-PMo12,rGO-Mo132and rGO-Mo368exhibited precise gradient separation of CQDs and Au nanoparticles by size exclusion *** results pave a promising way to construct new twodimensional（2 D） membranes for highly efficient size-selective separation.

关键词：

Effect of cooling media on bead geometry,microstructure,and mechanical properties of wire arc additive manufactured IN718 alloy

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Advances in Manufacturing 2024年第1期12卷 124-149页

作者： Parveen Kumar Satish Kumar Sharma Ratnesh Kumar Raj Singh department of Mechanical engineering Thapar Institute of Engineering and TechnologyPatialaPunjab147004India

This work aims to present and explore thermal management techniques for the wire arc additive manufacturing(WAAM)of IN718 *** heat can be mitigated via air or water *** this study,the material was deposited under four different heat-input conditions with air or water *** air cooling,the layer is deposited in a normal atmospheric air environment,whereas with water cooling,the material is deposited inside a water tank by varying the water *** validate the air and water cooling thermal management techniques,IN718 single-pass and multilayer linear walls were deposited using the bidirectional gas metal arc welding based WAAM setup under four different heat input *** the deposition of single layers,the temperature profiles were recorded,and the geometric and microstructural features were *** multilayer wall structures,the mechanical properties(hardness,tensile strength,and elongation)were determined and assessed using the corresponding microstructural features explored through scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),and electron backscatter diffraction(EBSD)*** microstructure observed through SEM analysis in the building direction was found to be nonhomogenous compared with that in the deposition ***,water cooling was found to govern bead characteristics,such as wall width and *** grain size and anisotropy of the mechanical properties also decreased in the water-cooled ***,water cooling is an economical and efficient method to mitigate excessive heat accumulation in WAAM-deposited IN718.

关键词： Air cooling Water cooling IN718 Bead characteristics Microstructure Electron backscatter diffraction(EBSD)

Molecular-scale co-assembly membranes derived from keplerate cluster:carbonic anhydrase-mimicking nanocapsules for enhanced CO/Nseparation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2024年

作者： Wanlei Zhao Hongqiang Li Ruoxuan Zheng Yixin Yang Wei Chen Yufei Song State Key Laboratory of Chemical resource engineering Beijing University of Chemical Technology Quzhou Institute for Innovation in resource Chemical engineering

The development of CO2separation membranes with high permeability and high selectivity,as well as ultra-thin selective layers,has always been ***,a molecular-scaled co-assembly strategy is employed to fabricate the Pebax-Mo132(Pebax=polyether-block-amide copolymer;Mo132=（NH4）42[Mo72VIMo60VO372（CH3COO）30（H2O）72]) *** optimal selfstanding membrane,Pebax-Mo132-5%,shows a CO2permeability of～384 Barrer and an ultra-high ideal CO2/N2selectivity of～244,outperforming most membranes reported in the *** CO2permeability and ideal CO2/N2selectivity are increased by 70%and 367%,respectively,compared with the pristine Pebax membrane.A thin-film composite membrane prepared by spin-coating technique on a support membrane with gutter layers also exhibits a CO2permeance of 838 GPU and a CO2/N2selectivity of *** excellent performance can be attributed to the following reasons:（1） strong hydrogen bonding interactions between{Mo132}clusters and Pebax confer excellent interfacial compatibility to the mixed matrix membranes;（2）incorporation of hollow{Mo132}clusters into the Pebax molecular chain decreases the crystallinity of Pebax,and thereby accelerates the chain dynamics and increases the free volume of the membrane;（3） in situ diffuse reflectance infrared Fouriertransform spectroscopy demonstrates that the{Mo132}clusters can effectively catalyze the hydration reaction of CO2and promote the transport of CO2;（4） furthermore,the 0.35 nm pores of the crown ether-type{Mo9O9}allow the accurate size sieving of CO2（0.33 nm） and N2（0.36 nm） molecules.

关键词：

Cu-based materials for electrocatalytic CO2 to alcohols:Reaction mechanism,catalyst categories, and regulation strategies

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第10期97卷 593-611页

作者： Yaru Lei Yaxin Niu Xiaolong Tang Xiangtao Yu Xiubing Huang Xiaoqiu Lin Honghong Yi Shunzheng Zhao Jiaying Jiang Jiyue Zhang Fengyu Gao Beijing Key Laboratory of resource-oriented Treatment of Industrial Pollutants School of Energy and Environmental Engineering University of Science and Technology Beijing Collaborative Innovation Center for Steel technology University of Science and Technology Beijing Beijing Key Laboratory of Function Materials for Molecule & Structure Construction School of Materials Science and Engineering University of Science and Technology Beijing

Electrocatalytic CO2reduction reaction（CO2RR） technology,which enables carbon capture storage and resource utilization by reducing CO2to valuable chemicals or fuels,has become a global research hotspot in recent *** the many products of CO2RR（carbon monoxide,acids,aldehydes and alcohols,olefins,etc.）,alcohols（methanol,ethanol,propanol,etc.） have a higher market value and energy density,but it is also more difficult to *** is known to be effective in catalyzing CO2to high valueadded alcohols,but with poor *** progress of Cu-based catalysts for the selective generation of alcohols,including copper oxides,bimetals,single atoms and composites is ***,to improve Cu-based catalyst activity and modulate product selectivity,the modulation strategies are straighten out,including morphological regulation,crystalline surface,oxidation state,as well as elemental doping and defect *** on the research progress of electrocatalytic CO2reduction for alcohol production on Cu-based materials,the reaction pathways and the key intermediates of the electrocatalytic CO2RR to methanol,ethanol and propanol are ***,the problems of traditional electrocatalytic CO2RR are introduced,and the future applications of machine learning and theoretical calculations are *** in-depth discussion and a comprehensive review of the reaction mechanism,catalyst types and regulation strategies were carried out with a view to promoting the development of electrocatalytic CO2RR to alcohols.

关键词： Alcohols Cu-based catalyst Electrocatalytic CO2RR Reaction mechanism Regulation strategies

A robust & weak-nucleophilicity electrocatalyst with an inert response for chlorine ion oxidation in large-current seawater electrolysis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第3期90卷 486-495,I0011页

作者： Junting Dong Chang Yu Hui Wang Lin Chen Hongling Huang Yingnan Han Qianbing Wei Jieshan Qiu State Key Laboratory of Fine Chemicals Frontier Science Center for Smart MaterialsSchool of Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina College of Chemical engineering State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Seawater splitting into hydrogen,a promising technology,is seriously limited by the durability and tolerance of electrocatalysts for chlorine ions in seawater at large current densities due to chloride oxidation and ***,we present a robust and weak-nucleophilicity nickel-iron hydroxide electrocatalyst with excellent selectivity for oxygen evolution and an inert response for chlorine ion oxidation which are key and highly desired for efficient seawater *** a weak-nucleophilicity electrocatalyst can well match with strong-nucleophilicity OH-compared with the weak-nucleophilicity Cl^(-),resultantly,the oxidation of OH-in electrolyte can be more easily achieved relative to chlorine ion oxidation,confirmed by ethylenediaminetetraacetic acid disodium probing ***,no strongly corrosive hypochlorite is produced when the operating voltage reaches about 2.1 V ***,a potential that is far beyond the thermodynamic potential of chlorine ion oxidatio *** concept and approach to reasonably designing weaknucleophilicity electrocatalysts that can greatly avoid chlorine ion oxidation under alkaline seawater environments can push forward the seawater electrolysis technology and also accelerate the development of green hydrogen technique.

关键词： Nickel-iron hydroxide electrocatalysts Highly selective seawater electrolysis Weak nucleophilicity Oxygen evolution reaction Hydrogen

维普期刊数据库