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Effects of rare earth Ce addition on microstructure and mechanical properties of impure copper containing Pb 认领 引用 被引量：17
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作者 Hai-hong LI Xiao LIU +5 位作者 Yang LI Shi-hong ZHANG Yan CHEN Song-wei WANG Jin-song LIU Jin-hu WU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第6期1574-1581,共8页
The effects of rare earth Ce on the microstructure and mechanical properties of impure copper containing Pb were investigated using OM,SEM,EPMA,TEM and tensile testing.TEM and EDS analysis reveal that spherical CePb3 ... The effects of rare earth Ce on the microstructure and mechanical properties of impure copper containing Pb were investigated using OM,SEM,EPMA,TEM and tensile testing.TEM and EDS analysis reveal that spherical CePb3 particles form after Ce addition.CePb3 particles,with average size of^3.6μm,homogenously distribute in the Cu matrix.Due to small lattice misfit(~4.62%)with Cu matrix,CePb3 particles can act as effective nucleation sites beneficial to the grain refinement.Pb at grain boundaries seriously deteriorates the mechanical properties of Cu.The tensile strength and the elongation of Cu-0.1 Pb are decreased by 43.1%and 56.7%compared with those of pure copper,respectively.Ce can purify grain boundaries,cause the precipitation of CePb3 particles and refine grain sizes,which contribute to significant improvement of the mechanical properties of Cu.Compared with Cu-0.1Pb,the tensile strength(179 MPa)and the elongation(38.5%)of Cu-0.1Pb-0.3Ce are increased by 117.6%and 151.6%,respectively. 展开更多
关键词 Ce addition impure copper containing Pb CePb3 second phase particle lattice misfit grain refinement mechanical property
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Application of rare-earth element Y in refining impure copper 认领 引用 被引量：13
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作者 Hai-hong Li Xue-qin Sun +2 位作者 Shang-zhou Zhang Qin-yi Zhao Guang-zhen Wang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2015年第5期453-459,共7页
The effects of rare-earth element Y in refining impure copper were investigated in this paper. The composition, microstructures, and corrosion resistance properties of impure copper before and after refinement with Y ... The effects of rare-earth element Y in refining impure copper were investigated in this paper. The composition, microstructures, and corrosion resistance properties of impure copper before and after refinement with Y were investigated using direct-reading spectrometry, inductively coupled plasma atomic emission spectrometry, optical microscopy, scanning electron microscopy, and potentiodynamic polariza- tion measurements. The results show that the concentrations of impurities S, As, Sb, Bi, A1, Cd, and Se are remarkably decreased. Adding an appropriate amount of Y refines the microstructure and enhances the corrosion resistance properties of impure copper in HC1 solution via a purification effect. The formation enthalpies of compounds formed between Y and various impurity elements were calculated on the basis of Miedema＇s theory. The thermodynamic mechanisms of the refinement of impure copper by Y were also discussed. 展开更多
关键词 copper refining yttrium addition impurities removal microstructure corrosion resistance
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Different poisoning behaviors of impurity gases on AB2-type Ti-based hydrogen storage alloys and their mechanisms 认领 引用 被引量：1
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作者 Yongpeng Chen Panpan Zhou +7 位作者 Jiapeng Bi Liuhui Zhu Lingchao Zhang Chengguo Yan Yuxiao Jia Xuezhang Xiao Xinhua Wang Lixin Chen 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第3期350-361,共12页
AB2-type Ti-based hydrogen storage alloys(HSAs)are promising for industrial hydrogen feeding systems due to their moderate operating conditions and high hydrogen storage capacity.However,their practical application... AB2-type Ti-based hydrogen storage alloys(HSAs)are promising for industrial hydrogen feeding systems due to their moderate operating conditions and high hydrogen storage capacity.However,their practical application is hindered by unavoidable impurity gases in hydrogen feedstocks,which significantly impair the performance of HSAs.Furthermore,the absence of clear evaluation criteria for poisoning behaviors and mechanisms hinders efforts to develop effective mitigation strategies.To address this gap,we used calculated surface interaction energy changes(ΔE)and experimental investigations to classify and rank the poisoning potential of impurity gases on a C14 Laves-phase Ti0.86Zr0.15Mn1.5Cr0.07(VFe)0.43 alloy.Impurity gases were classified into two types of weak-adsorption and strong-adsorption impurity gases by comparing theirΔE with that of H2(ΔE_(H2)=-1.6001 eV).AsΔE>ΔE_(H2) ,weak-adsorption impurity gases(Ar,He,CH4,and N2)induce poisoning by forming enriched blocking layers that impede H2 diffusion.This blocking effect can be alleviated under gas flow conditions.AsΔE<ΔE_(H2),strong adsorption gases are further divided into two types based on their reactivity with the alloy.Non-reactive strong-adsorption impurity gases(CO and CO2 )preferentially occupy surface active sites,blocking H2 adsorption and dissociation.In contrast,reactive strong-adsorption impurity gases(such as O2)form dense passivation layers that completely prevent hydrogen ingress.Accordingly,surface modification offers an effective approach to mitigate gas-induced poisoning by altering the interaction mechanism.This study establishes the parameter-based criteria for classifying impurity gas poisoning mechanisms in AB2-type Ti-based HSAs.It provides fundamental insights for guiding the design of poisoning-resistant materials and the development of mitigation strategies. 展开更多
关键词 Ti-based hydrogen storage alloys Impurity gas Surface interaction energy change Poisoning mechanisms
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Effect of trace impurity elements on high-temperature corrosion resistance of DD98M alloy 认领 引用
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作者 Geng-yi DONG Yijiala YILITI +6 位作者 Run-ze YU Jie MENG Wen-jun HAN Kai CHANG Qi-fei ZHANG Xiao-gang YOU Yi-nong WANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第2期522-537,共16页
The influence of varying levels of impurity elements on the hot corrosion resistance of the DD98M alloy in Na2SO4+NaCl salt at 950℃ was investigated.The results indicate that the corrosion resistance of the DD9... The influence of varying levels of impurity elements on the hot corrosion resistance of the DD98M alloy in Na2SO4+NaCl salt at 950℃ was investigated.The results indicate that the corrosion resistance of the DD98M alloy significantly decreases with an increase in impurity content,and the presence of nitrogen leads to an increase in alloy porosity.These porosities promote the rapid diffusion of molten salt and oxygen into the alloy,resulting in a bilateral diffusion of oxygen and sulfur,which leads to an accumulation of these elements at the oxide−matrix interface.This process contributes to the formation and propagation of interfacial cracks.A growth model was developed for hot corrosion products in alloys with varying impurity elements. 展开更多
关键词 molten salts DD98M alloy hot corrosion impurity element
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High-Value Targeted Conversion of Copper Slag as LiFePO4 Material for Lithium-Ion Batteries 认领 引用
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作者 Yuyun Li Wanquan Yu +3 位作者 Haigang Dong Chenchen Li Qi Meng Peng Dong 《Rare Metals》 SCIE EI CAS CSCD 2026年第4期447-460,共14页
The massive stockpiling of copper slag(CS)presents severe environmental and resource-waste challenges.Existing strategies for CS valorization typically yield low-value-added products.Herein,we propose an innovative hi... The massive stockpiling of copper slag(CS)presents severe environmental and resource-waste challenges.Existing strategies for CS valorization typically yield low-value-added products.Herein,we propose an innovative hierarchical regulation approach to transform CS into high-performance LiFePO4(LFP)cathode materials.The process involved alkali hydrolysis pretreatment followed by oxidative leaching with HNO3 and H2O2.This step selectively removed 71.6%of Si and 82.2%of Al impurities while enriching valuable metals,such as Zn(83.29%),Pb(57.10%),and Cu(73.60%),in the leachate.Subsequent thermodynamically guided coprecipitation and direct phosphation achieved complete Fe utilization and introduced trace Ti doping(0.28 wt%).The optimized LFP@1 and LFP@2 cathodes demonstrate exceptional electrochemical performance,exhibiting specific capacities of 108.19 and 128.21 mAh g-1 at 1C,respectively,while retaining over 97%capacity retention after 300 cycles.A comprehensive life cycle assessment confirms the environmental superiority of this process.This work successfully establishes a closed-loop strategy for CS upcycling and provides fundamental insights into impurity-phase regulation for valorizing iron-silicate-based wastes. 展开更多
关键词 copper slag hierarchical impurity regulation LiFePO4 resource utilization trace element conversion
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High-mobility,low-resistive boron-doped diamond material realized by oxygen assistance 认领 引用
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作者 Gengyou Zhao Kun Tang +9 位作者 Kai Yang Bo Feng Liangxue Gu Xiang Xiong Tao Tao Bin Liu Jiandong Ye Rong Zhang Youdou Zheng Shulin Gu 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第4期604-613,共10页
The effect of trace oxygen on the light-doping behavior of boron in diamond films during microwave plasma chemical vapor deposition was experimentally investigated.Boron-doped diamond films were grown continuously und... The effect of trace oxygen on the light-doping behavior of boron in diamond films during microwave plasma chemical vapor deposition was experimentally investigated.Boron-doped diamond films were grown continuously under different oxygen concentrations[oxygen/carbon(O/C)=0%-5%].When oxygen was added during the diamond doping process,improvements in crystal quality and surface morphology were observed,and residual nitrogen was significantly suppressed.However,further increasing the oxygen concentration could lead to surface defects.We evaluated and discussed the carrier mobility,carrier concentration and boron content of the samples.At room temperature,under the condition of O/C=4%,the maximum hole mobility reached 1400 cm2·V-1·s-1,and a higher carrier concentration of 1.5×1015cm-3was obtained,which is an excellent result compared with all previous studies.In addition,the characteristic peaks that appeared in both low-temperature photoluminescence spectra and absorption spectra were analyzed,and it was found that the characteristic peak at 4.7 eV(270 nm)may correspond to a boron-nitrogen complex,supplementing the effect of borondoped diamond on defect formation.These findings demonstrate the potential of controlling the boron concentration in diamond films using oxygen concentration in a plasma environment and open avenues for future applications in advanced optoelectronic devices. 展开更多
关键词 diamond chemical vapor deposition impurity concentration electrical properties infrared and Raman spectra
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Corrosion behavior of as-rolled Fe-17.4Cr-12.4Ni-2.63Mo-1.57Mn-0.044C(in wt.%)stainless steel in high-temperature impurity gases 认领 引用
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作者 Xiang-Bo Xu Dao-Kui Xu +1 位作者 Shuo Wang Sheng-Hu Chen 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第5期251-263,共13页
The high-temperature corrosion behaviors of an as-rolled Fe-17.4Cr-12.4Ni-2.63Mo-1.57Mn-0.044C(in wt.%)austenitic stainless steel in nuclear-grade helium environments containing with 10,100 and 1000 magnification impu... The high-temperature corrosion behaviors of an as-rolled Fe-17.4Cr-12.4Ni-2.63Mo-1.57Mn-0.044C(in wt.%)austenitic stainless steel in nuclear-grade helium environments containing with 10,100 and 1000 magnification impurity tolerance concentrations at 550℃were investigated and compared.Based on the quantitative relationship between mass gain and corrosion time,the high-temperature corrosion kinetics curves of the alloy in different helium environments were determined.The results demonstrated that for different samples,their mass gains exhibited a parabolic increase over the corrosion time.Raman spectroscopy and GIXRD analyses revealed that the high-temperature corrosion mechanisms of different samples are similar and the formed surface oxide layers were primarily composed of Fe2O3,Cr2O3,Fe3O4 and NiFe2O4.Under the equivalent corrosion damage and mass gain conditions in helium containing with 10,100 and 1000 magnification impurity tolerance concentrations,the corresponding corrosion time required to achieve a mass gain of 0.5 mg/cm2were determined to be 200,600 and 1000 h,respectively.Based on the principle of same damage mechanism and equal damage degree,an acceleration testing method was proposed and the corresponding empirical formulas were established for evaluating the long-term high-temperature corrosion extent of austenitic stainless steels in nuclear-grade helium environments. 展开更多
关键词 Steel Corrosion behavior Microstructure Corrosion mechanism Impurity gas
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Solid State Physics View of Liquid State Chemistry Ⅲ. Electrical Conductance of Pure and Impure Water 认领 引用 被引量：2
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作者 揭斌斌 薩支唐 《Journal of Semiconductors》 EI CAS CSCD 2014年第4期1-20,共20页
The ＇abnormally＇ high electrical conductivity ofpure water was recently studied by us using our protonic bond, trap and energy band model, with five host particles： the positive and negative protons, and the amphot... The ＇abnormally＇ high electrical conductivity ofpure water was recently studied by us using our protonic bond, trap and energy band model, with five host particles： the positive and negative protons, and the amphoteric protonic trap in three charge states, positive, neutral and negative. Our second report described the electrical charge storage capacitance of pure and impure water. This third report presents the theory of particle density and electrical conductance of pure and impure water, including the impuritons, which consist of an impurity ion bonded to a proton, proton-hole or proton trap and which significantly affect impure waters＇ properties. 展开更多
关键词 solid state and soft matter physics liquid state chemistry pure and impure water positive proton,negative proton-hole or protole, and amphoteric proton traps impuritons, affinitons, atomic or oxygenphonons, hydrogen or protonic phonons, and molecular phonons
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Solid State Physics View of Liquid State Chemistry Ⅱ. Electrical Capacitance of Pure and Impure Water 认领 引用
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作者 揭斌斌 薩支唐 《Journal of Semiconductors》 EI CAS CSCD 2014年第2期1-19,共19页
More than 80 years of theories and experiments on water suggested to us, described in our first water-physics report, that pure water＇s ＂abnormally＂ high electrical conductivity is due to transport of positive and ... More than 80 years of theories and experiments on water suggested to us, described in our first water-physics report, that pure water＇s ＂abnormally＂ high electrical conductivity is due to transport of positive and negative quasi-protons, p＋ and p-, between the neutral proton traps V （H20） in the extended water, [（H20）N]＋, converting it respectively to positively and negatively charged proton traps, V＋ = （H30）1＋ and V- = （HO）1-. In this second report, we present the theoretical charge control capacitances of pure and impure water as a function of the DC electric potential applied to water. 展开更多
关键词 solid state physics liquid state chemistry pure and impure water positive and negative quasi-protons proton vacancies water capacitance
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Yttrium microalloying enhances the corrosion resistance of a dilute Mg-Zn-Ca alloy by mitigating the detrimental effects of Si impurity and pitting 认领 引用
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作者 Yufei Wang Yajie Yang +3 位作者 Tianshuai Wang Bingyu Wang Zhangting Hu Hui-Yuan Wang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第4期127-142,共16页
This work assesses the role of micro-level yttrium(0.2 wt.%)in governing the corrosion characteristics of a low-alloyed Mg-0.5Zn-0.2Ca(ZX)system.The Y addition transforms the cathodic CaMgSi phase into a newly identif... This work assesses the role of micro-level yttrium(0.2 wt.%)in governing the corrosion characteristics of a low-alloyed Mg-0.5Zn-0.2Ca(ZX)system.The Y addition transforms the cathodic CaMgSi phase into a newly identified,less noble Y2MgSi2 phase,reducing the VPD from ~170 mV to ~108 mV and diminishing the micro-galvanic corrosion and pitting initiation.Y also facilitates the formation of a more compact and stable oxide film,thus serving as an effective barrier against the intrusion of corrosive ions.Consequently,the Mg-0.5Zn-0.2Ca-0.2Y(ZX-Y)alloy attains a corrosion rate of 0.29 mm y-1,corresponding to about a 47% decrease relative to the ZX alloy,despite its extremely low total alloying level(0.83 wt.%).Moreover,the alloy exhibits a transition toward more homogeneous surface dissolution,highlighting the substantial improvement in overall corrosion resistance.These findings demonstrate that Y microalloying provides an efficient,cost-effective strategy for mitigating the detrimental effects of Si impurities and enhancing the surface film protectiveness in dilute Mg alloys.This work provides fresh perspectives for tailoring lightweight Mg alloys toward enhanced corrosion resistance. 展开更多
关键词 Mg-Zn-Ca alloy Microalloying Micro-galvanic corrosion Impurity Corrosion product film
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Efficient preparation of AlV65 alloy through aluminothermic reduction of sodium metavanadate precipitated from shale V-rich solution 认领 引用
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作者 Zihanyu Zhang Yimin Zhang +3 位作者 Hong Liu Nannan Xue Pengcheng Hu Wenbin Bo 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第3期921-934,共14页
The use of Al-V alloys as intermediate additives is pivotal for producing high-performance Ti alloys.Traditionally,the synthesis of these alloys relies on high-purity V2O5,with sodium metavanadate as an essentia... The use of Al-V alloys as intermediate additives is pivotal for producing high-performance Ti alloys.Traditionally,the synthesis of these alloys relies on high-purity V2O5,with sodium metavanadate as an essential intermediate in V2O5production.This study explores an alternative approach utilizing sodium metavanadate directly,offering an aluminothermic process to alleviate the environmental impact and reduce the time required for V2O5preparation.Al-V alloys are synthesized using sodium metavanadate derived from a shale V-rich solution,and the impurity-migration behaviors are comprehensively analyzed,specifically focusing on Fe,Al,and Na.The result sreveal that Al interacts with CaO to form a slag phase that is different from the alloy,whereas Na undergoes a sequence of reductions (NaVO3→Na2V2O5→NaVO2→Na)and volatilizes at 25-1200℃,thereby avoiding incorporation into the alloy.Fe,reduced by Al,enriches the alloy phase and induces a phase transition(Al-V→Al-Fe→Fe-V)in the presence of excess Fe.Sodium metavanadate(Fe≤0.05wt%)derived from the shale V-rich solution enables the production of a uniform AlV65 alloy with 66.56wt%V,33.14wt%Al,0.08wt%Fe,0.07wt%C,0.02wt%N,and 0.12wt%O.These results establish a streamlined,efficient framework for the future preparation of Al-V alloys from shale V-rich solutions. 展开更多
关键词 AlV65 alloy sodium metavanadate shale V-rich solution impurity
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Electrochemical separation of Mn(Ⅱ)impurity from molten salt electrolyte for magnesium electrolysis 认领 引用
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作者 Zhi-wen ZHAO Zheng ZENG +3 位作者 Yan-ping WANG Pei TANG Chang JIANG Zhong-sheng HUA 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第3期1000-1014,共15页
The electrochemical separation of Mn(Ⅱ)impurity from molten NaCl-KCl-MgCl2was systematically investigated to facilitate the electrolytic production of high-purity magnesium.The reduction of Mn(Ⅱ)to Mn metal on tu... The electrochemical separation of Mn(Ⅱ)impurity from molten NaCl-KCl-MgCl2was systematically investigated to facilitate the electrolytic production of high-purity magnesium.The reduction of Mn(Ⅱ)to Mn metal on tungsten electrode was a quasi-reversible process controlled by diffusion.The apparent standard potential and exchange current density of Mn(Ⅱ)/Mn(0)electrode reaction were determined at temperatures ranging from 973 to 1048 K.Solid Mn metal generated during electrolysis aggregated into irregular clumps and adsorbed some needle-like MgO,imposing a detrimental effect on both the aggregation and the purity of magnesium metal.After electrolysis at-1.5 V in molten NaCl-KCl-MgCl2-0.62wt.%MnCl2for 8 h,the concentration of MnCl2impurity decreased to 0.037 wt.%,achieving a removal efficiency of 94.14%.When direct electrolysis was performed in molten NaCl-KCl-MgCl2-0.62wt.%MnCl2,the obtained magnesium metal was small blocks with a caviar-like appearance,and the purity was just 98.59%.In contrast,a large globule of magnesium metal was obtained when electrolysis was performed in the purified electrolyte,and its purity was improved to 99.94%.The controlled-potential electrolysis proposed in this work has been verified to be a green and practically effective method to separate the metal ion impurities from molten electrolyte for high purity magnesium extraction. 展开更多
关键词 electrochemical separation Mn(Ⅱ)impurity high purity magnesium removal efficiency molten salt electrolyte
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Gas impurities in salt cavern hydrogen storage:Formation mechanisms and impacts 认领 引用
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作者 Nuruddeen Inuwa Aminu Efenwengbe Nicholas Aminaho Faith Aminaho 《Acta Geochimica》 EI CAS CSCD 2026年第4期803-832,共30页
Hydrogen(H2)is increasingly recognized as a viable low-carbon energy carrier.It can be produced by electrolysis and only emits water when consumed in fuel cells,making it essentially carbon free at the point of use... Hydrogen(H2)is increasingly recognized as a viable low-carbon energy carrier.It can be produced by electrolysis and only emits water when consumed in fuel cells,making it essentially carbon free at the point of use.To support a large-scale hydrogen economy,however,vast quantities of H2must be stored to balance seasonal and diurnal mismatches between intermittent renewable generation and end-use demand.Salt caverns have long been considered one of the most promising options for underground hydrogen storage(UHS),owing to their low permeability,high geomechanical stability,and favorable operational characteristics.Despite these advantages,salt caverns present challenges related to in situ gas impurity generation during H2residence.Natural salt formations contain mineral inclusions such as anhydrite,carbonates,clays,and metal sulfides,which may participate in geochemical reactions that introduce contaminants,including hydrogen sulfide(H2S),carbon dioxide(CO2),methane(CH4),and other trace gases,into stored hydrogen.Microbial processes and materials corrosion may further contribute to impurity formation.This review synthesizes the current state of knowledge on impurity generation mechanisms in salt cavern hydrogen storage.It examines geochemical,microbiologic,and corrosion-related pathways that may alter hydrogen purity and evaluates the consequences of these impurities for cavern integrity,infrastructure performance,and hydrogen fuel-cell applications.Understanding the geochemical,microbial,and operational characteristics of individual storage sites is essential for predicting impurity behavior and developing effective mitigation strategies.Further work is needed to quantify reaction rates,constrain uncertainty,and support the design of safe and efficient UHS projects in the future. 展开更多
关键词 Hydrogen Salt caverns Underground hydrogen storage Impurities Anhydrite
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Identifying Fe-bearing inclusions in electrolytic magnesium and deep purification via Ti-Si trapping 认领 引用
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作者 Bingbing Gao Bo Yang +5 位作者 Rui Zheng Boyu Liu An Wang Jiuzhang Li Hangwei Cui Zhiwei Shan 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第7期186-198,共13页
Electrolytic primary magnesium generally contains elevated Fe impurities,which severely degrade corrosion resistance,thus limiting downstream use.Although vacuum sublimation,in principle,should separate Fe from magnes... Electrolytic primary magnesium generally contains elevated Fe impurities,which severely degrade corrosion resistance,thus limiting downstream use.Although vacuum sublimation,in principle,should separate Fe from magnesium because Fe is far less volatile,the purified condensate frequently remains Fe-rich.Here we identify that Fe resides mainly in micrometer-scale inclusions(elemental Fe and Fe-bearing intermetallic particles).Through analysis of the drag force exerted by magnesium vapor on these inclusions,we determine that they can be entrained in the vapor stream,thus bypassing separation based solely on volatility difference.To intercept these particles,we implement an in-line filtration positioned in an appropriate thermal zone along the vapor route,and select Ti mesh packed with Si particles as the interception medium based on thermal stability,affinity for impurity species,and cost.In controlled comparisons using industrial electrolytic magnesium(258 ppm Fe),sublimation alone lowers Fe to 76 ppm,Ti-mesh filtration lowers it to 28 ppm,and Ti-Si integrated trapping to 4 ppm,meeting the Mg9999 specification without detectable Ti or Si contamination.These results establish particulate entrainment as a principal barrier to deep purification by sublimation and provide a practical framework for upgrading electrolytic magnesium via targeted particle interception and rational trap design. 展开更多
关键词 Electrolytic magnesium Purification Vacuum sublimation Fe-bearing impurities Particle entrainment
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Thermodynamic and experimental evaluation of the sustainable recycling of magnesium alloy scrap by vacuum distillation based on vapor-liquid equilibrium 认领 引用 被引量：2
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作者 Lipeng Wang Dong Liang +6 位作者 Yang Tian Jianxue Chai Rui Li Shuji Wu Bin Yang Baoqiang Xu Yong Deng 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第1期283-295,共13页
Magnesium(Mg)alloys are widely used lightweight structural materials for automobiles and help reduce carbon emissions.However,their use increases the production of Mg alloy scrap,which is recycled at a much lower rate... Magnesium(Mg)alloys are widely used lightweight structural materials for automobiles and help reduce carbon emissions.However,their use increases the production of Mg alloy scrap,which is recycled at a much lower rate than aluminum,and its greater complexity poses challenges to existing recycling processes.Although vacuum distillation can be used to recycle Mg alloy scrap,this requires optimizing and maximizing metal recirculation,but there has been no thermodynamic analysis of this process.In this study,the feasibility and controllability of separating inclusions and 23 metal impurities were evaluated,and their distribution and removal limits were quantified.Thermodynamic analyses and experimental results showed that inclusions and impurity metals of separation coefficient lgβi≤-5,including Cu,Fe,Co,and Ni below 0.001 ppm,could be removed from the matrix.All Zn entered the recycled Mg,while impurities with-1<lgβi<-5 such as Li,Ca,and Mn severely affected the purity of the recycled Mg during the later stage of distillation.Therefore,an optimization strategy for vacuum distillation recycling:lower temperatures and higher system pressures for Zn separation in the early stage,and the early termination of the recovery process in the later stage or a continuous supply of raw melt can also prevent contamination during recycling.The alloying elements Al and Zn in Mg alloy scrap can be further recovered and purified by vacuum distillation when economically feasible,to maximize the recycling of metal resources. 展开更多
关键词 Magnesium alloy Scrap recycling Thermodynamic analysis Impurity removal Vacuum distillation
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Effect of trace cerium addition on hot deformation behavior of ultrahigh-purity copper containing sulfur 认领 引用 被引量：1
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作者 Ke-xing SONG Yun-xiao HUA +4 位作者 Hai-tao LIU Yan-min ZHANG Chao-min ZHANG Yan-jun ZHOU Tao HUANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第3期888-901,共14页
The effects of trace cerium(Ce)addition on the microstructural and textural evolution and the dynamic recrystallization(DRX)of the ultrahigh-purity copper(Cu)containing small amounts of sulfur(S)were investigated usin... The effects of trace cerium(Ce)addition on the microstructural and textural evolution and the dynamic recrystallization(DRX)of the ultrahigh-purity copper(Cu)containing small amounts of sulfur(S)were investigated using a Gleeble-1500 thermal simulation tester at 600℃.The results show that with increasing Ce content,the grain size of the Cu-S(S2)alloy gradually decreases and the grain boundary embrittlement induced by S impurities is considerably inhibited.The addition of Ce promotes the DRX process of the S2 alloy and changes its DRX mechanism from discontinuous to continuous and twinning-induced DRX mechanisms.The texture component and intensity of the S2 alloy vary with the increase of Ce content.The addition of 120×10-6 Ce(mass fraction)is favorable for the grain orientation randomization,which is attributed to the promoted DRX. 展开更多
关键词 Ce addition S impurities ultrahigh-purity copper microstructure dynamic recrystallization texture
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Rapid identification method for inclusions in evaluating high-purity quartz 认领 引用 被引量：1
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作者 Min Liu Guocheng Lv +7 位作者 Xin Liu Zijie Ren Meitang Liu Ritong Huang Xinyu Hou Qinwen Zheng Libing Liao Jingwen Mao 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2025年第9期2131-2140,共10页
The rapid growth of semiconductor,photovoltaic,and other emerging industries has led to a sharp increase in the demand for high-purity quartz in China,particularly 4N5-grade(99.995%pure SiO2).However,heavy reliance... The rapid growth of semiconductor,photovoltaic,and other emerging industries has led to a sharp increase in the demand for high-purity quartz in China,particularly 4N5-grade(99.995%pure SiO2).However,heavy reliance on imported high-purity quartz poses a significant risk to the security of key national strategic industries.To address this challenge,China is focusing on identifying domestic sources of high-purity quartz and developing efficient evaluation methods.This study investigates the inclusion content in three types of quartz:pegmatite,vein quartz,and white granite.A grading system based on the transmittance of quartz grains was established by analyz-ing the number of inclusions.Five quartz ore samples from different regions were purified,and the resulting concentrates were analyzed using inductively coupled plasma mass spectrometry(ICP-MS).The relationships among the inclusion content of raw quartz,impurity composition of purified quartz,and quality of sintered fused quartz products were examined.The findings demonstrate that quartz with fewer inclusions results in lower impurity levels after purification,higher SiO2purity,and more translucent glass,as confirmed by firing tests.Herein,this study establishes a clear connection between quartz inclusions and the overall quality of high-purity quartz.The pro-posed approach enables the rapid assessment of quartz deposit quality by identifying inclusions,offering a practical and efficient method for locating high-quality quartz resources. 展开更多
关键词 high-purity quartz grading inclusions rapid evaluation purification impurity content mineral exploration resource security
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Nondestructive detection and classification of impurities-containing seed cotton based on hyperspectral imaging and one-dimensional convolutional neural network 认领 引用 被引量：1
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作者 Yeqi Fei Zhenye Li +2 位作者 Tingting Zhu Zengtao Chen Chao Ni 《Digital Communications and Networks》 SCIE EI CSCD 2025年第2期308-316,共9页
The cleanliness of seed cotton plays a critical role in the pre-treatment of cotton textiles,and the removal of impurity during the harvesting process directly determines the quality and market value of cotton textile... The cleanliness of seed cotton plays a critical role in the pre-treatment of cotton textiles,and the removal of impurity during the harvesting process directly determines the quality and market value of cotton textiles.By fusing band combination optimization with deep learning,this study aims to achieve more efficient and accurate detection of film impurities in seed cotton on the production line.By applying hyperspectral imaging and a one-dimensional deep learning algorithm,we detect and classify impurities in seed cotton after harvest.The main categories detected include pure cotton,conveyor belt,film covering seed cotton,and film adhered to the conveyor belt.The proposed method achieves an impurity detection rate of 99.698%.To further ensure the feasibility and practical application potential of this strategy,we compare our results against existing mainstream methods.In addition,the model shows excellent recognition performance on pseudo-color images of real samples.With a processing time of 11.764μs per pixel from experimental data,it shows a much improved speed requirement while maintaining the accuracy of real production lines.This strategy provides an accurate and efficient method for removing impurities during cotton processing. 展开更多
关键词 Seed cotton Film impurity Hyperspectral imaging Band optimization Classification
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Solidification mechanism and harmful elements removal behavior in preparation of sulfuric acid slag pellets 认领 引用 被引量：1
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作者 Yu-feng Guo Fu-chun Xu +5 位作者 Shuai Wang Feng Chen Ling-zhi Yang Yu Zheng Tao Jiang Guan-zhou Qiu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第10期3202-3219,共18页
Sulfuric acid slag,a common byproduct with high iron content,poses challenges due to its high levels of harmful impurities and is often discarded as solid waste,leading to significant environmental and water pollution... Sulfuric acid slag,a common byproduct with high iron content,poses challenges due to its high levels of harmful impurities and is often discarded as solid waste,leading to significant environmental and water pollution.To address this issue and improve resource utilization,the preparation process of oxidized pellets from sulfuric acid slag was studied,exploring suitable pelletizing systems and thermal parameters.Additionally,the removal of harmful elements and the consolidation mechanism were established during the oxidation roasting process.The findings revealed that sulfuric acid slag along with specific processing conditions,such as using two high-pressure grinding rolls and adding 1.25 wt.%bentonite,resulted in the production of qualified green pellets with desirable physical properties.Through a thermal treatment process involving preheating and roasting,the desulfurization rate of the pellets reached 95.55%and the removal efficiency of arsenic achieved 27.11%.Hematite recrystallizes,shrinks,and forms a reticulated structure with Fe2O3 recrystallization as the backbone,resulting in higher consolidation strength. 展开更多
关键词 Sulfuric acid slag Pellet High-pressure grinding roll Harmful impurity Desulfurization
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Deep removal impurities in the process of preparing high-purity magnesium by vacuum gasification 认领 引用 被引量：1
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作者 Dong Liang Lipeng Wang +4 位作者 Tingzhuang Ma Rong Yu Yang Tian Baoqiang Xu Bin Yang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第6期2813-2824,共12页
Magnesium(Mg),as one of the most abundant elements in earth's crust,is the lightest structural metal with extensive applications across various industries.However,the performance of Mg-based products is highly dep... Magnesium(Mg),as one of the most abundant elements in earth's crust,is the lightest structural metal with extensive applications across various industries.However,the performance of Mg-based products is highly dependent on their impurity levels,and the lack of high-purity Mg,along with efficient purification method,has posed significant challenge to its widespread industrial adoption.This study investigates the impurity behavior in Mg ingots during the vacuum gasification purification process.Through the analysis of binary phase diagrams,iron(Fe)-based foam material was selected for the filtration and purification of Mg vapor in a vacuum tube furnace.A novel approach combining vacuum gasification,vapor purification,and directional condensation is proposed.The effect of filter pore sizes and filtration temperatures on the efficacy of impurity removal was evaluated.Experimental results demonstrate that Fe-based foam with a pore size of 60 ppi,at a filtration temperature of 773 K,effectively removes impurities such as calcium(Ca),potassium(K),sodium(Na),manganese(Mn),silicon(Si),aluminum(Al),and various oxides,sulfides,and chlorides from the vapor phase.Consequently,high-purity Mg with a purity level exceeding 5N3 was obtained in the condensation zone. 展开更多
关键词 Phase diagram Foam material Impurity filtration Vapor purification Condensation
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