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Leaching of rare earths and aluminum in weathered crust elutiondeposited rare earth ore using magnesium sulfate:Effect of aluminum content in leaching agent solution

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Journal of Rare Earths 2025年第1期43卷 191-198,I0007页

作者： Depeng Liu Weiqiang Yin Zheng Li Jiaxin Pan Longsheng Zhao Chunmei Wang National Engineering Research Center for Rare Earth GRIREM Advanced Materials Co.Ltd.Beijing100088China GRIREM Hi-Tech Co. Ltd.Langfang065201China GRIMAT Engineering Institute Co. Ltd.Beijing100088China Rare Earth Functional Materials(Xiong'an)Innovation Center Co. Ltd.Xiong'an071700China

aluminum is the main impurity of the weathered crust elution-deposited rare earth ore(WCED-REO).Efficient leaching of rare earths and low leaching of aluminum are of great importance for the leaching of the *** effects of pH,MgSO_(4) concentration and Al^(3+)concentration of the leaching agent solution on the column leaching behaviors of WCED-REO using magnesium sulfate were *** data show that controlling the MgSO_(4) concentration to 0.15 mol/L,pH of the leaching agent solution to 2,the leaching amount of aluminum from the rare earth ore gradually decreases with the increase of Al^(3+)concentration in the leaching agent solution,indicating that Al^(3+)in the leaching agent solution may act as leaching agent to participate in the ion exchange of RE3+,but the leaching amounts of rare earths change insignificantly as the Al^(3+)concentration is *** the MgSO_(4) concentration is beneficial to the leaching of aluminum,and when the Al^(3+)concentration is 0.04 mol/L(Al accumulation),the amount of Al^(3+)leached from the rare earth ore increased gradually with increasing the MgSO_(4) *** pH of the leaching agent solution has a significant influence on the leaching of aluminum in the rare earth ore,and the leaching amount of aluminum from the rare earth ore increases gradually with decreasing the *** the Al^(3+)conce ntration is 0.04 mol/L(Al accumulation)and the pH of the leaching agent solution is above 2.0,the aluminum in the leaching agent solution can be back-adsorbed onto the rare earth ore,and the amount of the back-adsorbed Al^(3+)increases with increasing the pH of the leaching agent *** injection rate of the leaching agent solution has slight effect on the leaching behavior of rare earths and *** summary,leaching of Al^(3+)and consumption of MgSO_(4) can be reduced by regulating the accumulation of aluminum,MgSO_(4) concentration and pH.

关键词： Weathered crust elution-deposited rare earth ore Rareearths Magnesium sulfate Rare earth leaching aluminum Back-adsorption

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aluminum exposure impairs oocyte quality via subcellular structure disruption and DNA damage-related apoptosis in mice

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Journal of Environmental Sciences 2024年第5期139卷 308-319页

作者： Hongge Li Jingcai Liu Weihua Nong Mengying Shen Sheng Dou Shaochen Sun Junli Wang The Affiliated Hospital of Youjiang Medical University for Nationalities Guangxi 533000China College of Animal Science and Technology Nanjing Agricultural UniversityNanjing 210095China School of Medical Laboratory Youjiang Medical University for NationalitiesGuangxi 533000China Industrial College of Biomedicine and Health Industry Youjiang Medical University for NationalitiesGuangxi 533000China Reproductive Medicine Guangxi Medical and Health Key Discipline Construction ProjectThe Affiliated Hospital of Youjiang Medical University for NationalitiesGuangxi 533000China

aluminum(Al)can lead to an exposure of creature in varieties ways for its universality,and it could disturb normal physiological metabolism,with the damage to multisystem including *** the oocyte quality is critical for female reproduction,we inspected the toxicity of Al on mouse oocyte *** constructed in vitro exposure mouse model,and we found that 5 mmol/L Al had adverse effects on oocyte maturation by impairing organelle and *** spindle and misaligned chromosomes which might be considered to be caused by elevated levels of acetylation,as well as abnormal distribution of actin dynamics could hinder normal meiosis of *** dysfunction indicated that Al affected proteins synthesis,transport and digestion,which would further damage oocyte *** order to explore the mechanism of Al toxicity,our further investigation demonstrated that Al caused mitochondrial dysfunction and imbalance calcium homeostasis,resulting in limited energy ***,high level of reactive oxygen species,DNA damage and apoptosis caused by oxidative stress were also the manifestation of Al toxicity on *** conclusion,our study provided the evidence that Al exposure affected oocyte quality through its effects on spindle organization,actin dynamics,organelle function and the induction of DNA damage-related apoptosis with mouse model.

关键词： aluminum Oocyte Cytoskeleton Organelle DNA damage

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aluminum,titanium and oxygen control during electroslag remelting of stainless steel based on thermodynamic analysis

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Journal of Iron and Steel Research International 2019年第1期26卷 20-31页

作者： Dong Hou Zhou-hua Jiang Tian-peng Qu De-yong Wang Fu-bin Liu Hua-bing Li School of Iron and Steel Soochow UniversitySuzhou 215021JiangsuChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina The State Key Laboratory of Refractories and Metallurgy Wuhan 430000HubeiChina

Experimental investigation and thermodynamic calculation were carried out to study the effect of slag on alloying elements during electroslag remelting with developing a thermodynamic model to control titanium and aluminum in in *** thermodynamic model based on ion and molecule coexistence theory and conservation law of element atoms was established to analyze the change in aluminum and titanium along the height of *** results show that low CaO slag is suitable for electroslag remelting of metal containing high titanium-to-aluminum *** electroslag remelting process consists of slag temperature-rising and temperature-stable periods,TiO2 should be added into water-cooled copper mold during temperature-rising period in order to keep the thermodynamic equilibrium between titanium and aluminum,and the amount of TiO2 is the difference value calculated by the reaction between titanium and alumina at 1477 and 1677℃.

关键词： Electroslag remelting Titanium control aluminum control Oxygen control Stainless steel Thermodynamic analysis Ion and molecule coexistence theory

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aluminum production by carbothermo-chlorination reduction of alumina in vacuum

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Transactions of Nonferrous Metals Society of China 2010年第8期20卷 1505-1510页

作者：袁海滨杨斌徐宝强郁青春冯月斌戴永年 National Engineering Laboratory of Vacuum Metallurgy Kunming University of Science and Technology Key Laboratory of Nonferrous Metals Vacuum Metallurgy of Yunnan Province Kunming University of Science and Technology Faculty of Materials and Metallurgy Engineering Kunming University of Science and Technology

aluminum production by carbothermo-chlorination reduction of alumina in vacuum was investigated by XRD, SEM, EDS and thermodynamic analysis. Thermodynamic calculations indicate that AlCl（g） generated by carbothermo-chlorination process among Al2O3-C-AlCl3 system should be at 1377-1 900K （100 Pa） and AlCl（g） will disproportionate into aluminum and AlCl3（g） below 950-1 050 K at 10-102 Pa. Experimental results demonstrate that Al4O4C and Al4C3 begin to be formed by Al2O3-C system over 1698 K （40-150Pa）. It is Al4O4C and Al4C3 but not Al2O3-C that participate in the carbothermic-chlorination reaction. Temperature for AlCl（g） generated by Al4O4C-AlCl3-C, Al4C3-Al2O3-AlCl3 and Al4OC-Al4C3-Al2O3-AlCl3-C system is 1 703-1853 K （40-150 Pa）. aluminum metal is produced by AlCl（g） disproportionation process below 933 K. The average purity of aluminum metal reaches 95.32%, which has perfect crystallization and uniform grain size.

关键词： alumina aluminum carbothermic-chlorination reduction AlCl

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aluminum nanocrystals evolving from cluster to metallic state:Size tunability and spectral evidence

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Nano Research 2022年第2期15卷 838-844页

作者： Hao Wu Xiaoyu Cheng Hongguang Dong Songjun Xie Sailing He National Engineering Research Centre for Optical Instruments College of Optical Science and EngineeringZhejiang UniversityHangzhou 310058China Ningbo Research Iristitute Ningbo 315100China

Sub-3 nm aluminum(Al)nanocrystal is an emerging class of nanomaterial with properties distinct to noble metal *** complete solution synthesis of aluminum nanoclusters was recently reported,and their photoluminescence(PL)was observed for the first *** the moment,there exists no method to tune the size of ultrasmall aluminum nanocrystals in solution thus no knowledge on the boundary state between aluminum nanoclusters to plasmonic *** this work,it is demonstrated a study of size-controlled solution synthesis of ultrasmall aluminum nanocrystals with size controlled between -2.2 and -3.8 *** the size results in three sets of spectral responses:(1)absorption due to nascent plasmons generated at -340 nm for larger particles,confirmed by Mie theory calculations;(2)significant decreased quantum yield of PL from -7.8%to -2.4%,indicating reduced quantum confinement effects and increased metallicity;(3)drop of fluorescence lifetime was observed,especially when the diameter of aluminum nanoparticles was changed from -3.0 to -3.8 *** study provides experimental evidence and insights to the transitional state between aluminum nanoclusters and plasmonic nanoparticles,which seems to occur at size larger than gold nanoclusters.

关键词： aluminum nanocrystals plasmon nanoclustors photoluminescence

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aluminum Control in CrNiMoV Steel during Electroslag Remelting Process

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International Journal of Minerals,Metallurgy and Materials 1998年第2期12卷 87-89页

作者： Anren Wang Yueguang Yu Jie Fu Metallurgy School, UST Beijing, Beijing 100083, China Metallurgy School UST Beijing Beijing 100083 China

The residual aluminum content has a great influence upon CrNiMoV steel properties and the optimal content is about 0.010%. The aluminum control during the ESR process has been investigated in this paper. All experiments were car ried out in a 20 kg ESR furnace. The results show that when a 60%CaF_2-30%Al_2O_3-5%SiO_2-5%CaO slag system and proper deoxidizing schedule is used, a reasonable ingot with optimal aluminum contents can be obtained. Silicon and magnesium contents are approximately the same with those in the electrode.

关键词： ESR aluminum CrNiMoV steel

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aluminum and Titanium Complexes Containing Pyrrole-imine Ligands: Syntheses, Structures, and Ring-opening Polymerization of ε-Caprolactone

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Chinese Journal of Structural Chemistry 2019年第10期38卷 1797-1806,1613页

作者：王亚兰党燕潘荟芬葛宇姜志垒夏升旺李亚红 College of Chemistry Chemical Engineering and Materials Science Soochow University

Syntheses and properties of aluminum and titanium complexes incorporating the pyrrole-imine ligands,N-((1H-pyrrol-2-yl)methyl)-1-(1H-pyrrol-2-yl)methanimine(H2L^1)and 2-cyano-1H-pyrrole(HL^2),have been *** of one equiv of H2L^1 to AlMe3 and AlEt3,respectively results in the formation of dinuclear complexes[Al2(L^1)2 Me2](1)and[Al2(L^1)2 Et2](2).Treatment of Ti(NMe2)4 with one equiv of HL^2 and two equiv of iPrOH or three equiv of BnOH results in the production of complexes[Ti(HL^3)2(OiPr)2](3)and[Ti2(HL^3)2(OBn)6](4)(H2L^3=N,N-dimethyl-1H-pyrrole-2-carboximid-amide).HL^3 anion is an intermediate which is in situ formed from the reaction of HL^2 and Ti(NMe2)*** structures of 1~4 were characterized by single crystal X-ray *** catalytic properties of 1~4 toward ring-opening polymerization(ROP)ofε-caprolactone were *** of the compounds could effectively initiate the polymerization reactions with good activities.

关键词： aluminum titanium pyrrole-imine ε-caprolactone ring-opening polymerization

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aluminum Complexes Stabilized by Piperazidine-Bridged Bis（phenolate） Ligands： Syntheses, Structures, and Applica- tion in the Ring-Opening Polymerization of ε-Caprolactone

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Chinese Journal of Chemistry 2012年第3期30卷 609-615页

作者：李文艺姚英明张勇沈琪 Key Laboratory of Organic Synthesis of Jiangsu Province College of ChemistryChemical Engineering&Materials ScienceDushu Lake CampusSoochow UniversitySuzhouJiangsu 215123China

The synthesis and characterization of aluminum alkoxide and alkyl complexes stabilized by piperazidine- bridged bis（phenolate） ligands are described. Treatment of ligand precursors Hz[ONNO]^1 {Hz[ONNO]^1= 1,4-bis（2-hydroxy-3-tert-butyl-5-methylbenzyl）piperazidine} and Hz[ONNO]2 {H2[ONNO]2=1,4-bis（2-hydroxy3,5-di-tert-butylbenzyl）piperazidine} with A1Et2（OCH2Ph） and A1Etz（OPr-i）, which were generated in situ by the reactions of AIEt3 with equivalent of the corresponding alcohols, in a 1： 1 molar ratio in THF gave the corresponding aluminum alkoxide complexes [ONNO]IAI（OCH2Ph）（1） and [ONNO]2Al（OPr-i）（2）, respectively. The reaction of H2[ONNO]^1 with A1Etz（OCHzPh） in a 1 ： 2 molar ratio in THF afforded a mixture of monometallic aluminum ethyl complex [ONNO] 1A1Et （3） and complex 1, which can be isolated by stepwise crystallization. Similarly, Hz[ONNO]2 reacted with A1Etz（OPr-0 in a 1： 2 molar ratio in THF to give a mixture of aluminum ethyl complex [ONNO]2AlEt （4） and complex 2. Complexes 1 and 2 were also available via treatment of complexes 3 and 4 with 1 equiv, of benzyl alcohol and isopropyl alcohol, respectively. All of these complexes were fully characterized including X-ray structural determination. It was found that complexes 1 to 4 can initiate the ring-opening polymerization of e-caprolactone, and complexes 1 and 2 showed higher catalytic activity in comparison with com- plexes 3 and 4.

关键词： aluminum piperazine-bridged bis(phenolate) ligand synthesis crystal structure polymerization,ε-caprolactone

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Theoretical Study on Reaction Mechanism of aluminum-Water System

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Chinese Journal of Chemical Physics 2008年第3期21卷 245-249页

作者： Yun-lan Sun Yan Tian Shu-fen Li Department of Chemical Physics University of Science and Technology of China Hefei 230026 China School of Metallurgy and Resources Anhui University of Technology Maanshan 243002 China

A theoretical study on the reaction of aluminum with water in the gas phase was performed using the hybrid density functional B3LYP and QCISD（T） methods with the 6-311＋G（d,p） and the 6-311＋＋G（d,p） basis sets. The results show that there are three possible reaction pathways that involve four isomers, seven transition structures, and two possible products for the reaction of aluminum with water. The two most favorable reaction pathways were found, whose intermediates and products agreed quite well with experimental results. The enthalpy and Gibbs free energy change of the reaction between A1 and H2O at 298 and 2000 K were calculated. Some results are also in good agreement with the previous calculations or experimental results.

关键词： aluminum Water Reaction mechanism Hybrid density functional theory

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aluminum Toxicity:A Case Study on Tobacco(Nicotiana tabacum L.)

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Phyton-International Journal of Experimental Botany 2023年第1期92卷 165-192页

作者： Munir Ozturk Mert Metin Volkan Altay Tomonori Kawano Alvina Gul Bengu Turkyilmaz Unal Dilek Unal Rouf Ahmad Bhat Moonisa Aslam Dervash Kristina Toderich Esra Koc Pedro Garcia Caparros Andleeb Shahzadi Department of Botany and Centre for Environmental Studies Ege UniversityIzmir35100Turkiye Graduate School of Environmental Engineering The University of KitakyushuFukuoka808-0135Japan Department of Biology Faculty of Science and ArtsHatay Mustafa Kemal UniversityHatay31060Turkiye Atta-ur-Rahman School of Applied Biosciences National University of Sciences&TechnologyIslamabad44000Pakistan Department of Biotechnology Faculty of Science and ArtsNigde Omer Halisdemir UniversityNigde51240Turkiye Department of Molecular Biology and Genetics Faculty of Science and ArtsUniversity of Bilecik Seyh EdebaliBilecik11230Turkiye Department of Environmental Science Sri Pratap CollegeCluster University SrinagarKashmir190008India Division of Environmental Sciences Sher-e-Kashmir University of Agricultural Sciences and TechnologyKashmir190025India International Platform for Dryland Research and Education Tottori UniversityTottori680-0001Japan Department of Biology Faculty of ScienceAnkara UniversityAnkara06100Turkiye Department of Superior School Engineering University of AlmeríaAlmería04120Spain Department of Medical Pharmacology Cerrahpasa Medicine FacultyIstanbul University-CerrahpasaIstanbul34096Turkiye

aluminum is an abundant metal in the earth’s crust that turns out to be toxic in acidic *** plants are affected by the presence of aluminum at the whole plant level,at the organ level,and at the cellular *** as a cash crop(Nicotiana tabacum L.)is a widely cultivated plant worldwide and is also a good model organism for *** there are many articles on Al-phytotoxicity in the literature,reviews on a single species that are economically and scientifically important are *** this article,we not only provide the biology associated with tobacco Al-toxicity,but also some essential information regarding the effects of this metal on other plant species(even animals).This review provides information on aluminum localization and uptake process by different staining techniques,as well as the effects of its toxicity at different compartment levels and the physiological consequences derived from *** addition,molecular studies in recent years have reported specific responses to Al toxicity,such as overexpression of various protective ***,this review discusses data on various organelle-based responses,cell death,and other mechanisms,data on tobacco plants and other kingdoms relevant to these studies.

关键词： aluminum oxidative stress protective proteins ROS tobacco toxicity

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