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Depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 335-345页

作者： Feng Zhang Chenyang Zhang Linlin Wu Wei Sun Hongliang Zhang Jianhua Chen Yong Pei Songjiang Li Engineering research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization Hunan International Joint Research Center for Efficient and Clean Utilization of Critical Metal Mineral ResourcesSchool of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083China State Key Laboratory of Mineral Processing Beijing General Research Institute of Mining&MetallurgyBeijing 100160China Hunan Provincial Key Laboratory of Micro&Nano Materials Interfaces Science College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Department of Chemistry Xiangtan UniversityXiangtan 411105China china Railway Resource group co.Ltd Beijing 102300China

The depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite still lacked in-depth ***,the depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite was further systematically investigated with experiments and density functional theory(DFT)*** X-ray photoelectric spectrosco.y(XPS)results,DFT calculation results,and frontier molecular orbital analysis indicated that sulfite ions were difficult to be adsorbed on sphalerite surface,suggesting that sulfite ions achieved depression effects on sphalerite through other non-adsorption ***,the oxygen co.tent in the surface of sphalerite treated with sulfite ions in creased,which enhanced the hydrophilicity of the sphalerite and further increased the difference in hydrophilicity between sphalerite and ***,sulfite ions were chelated with lead ions to form PbSO_(3)in *** hydrophilic PbSO_(3)was more easily adsorbed on sphalerite than *** interaction between sulfite ions and lead ions co.ld effectively inhibit the activation of *** addition the UV spectrum showed that after adding sulfite ions,the peak of perxanthate in the sphalerite treated xanthate solution was significantly stronger than that in the galena with xanthate solution,indicating that xanthate interacted more readily with sulfite ions and oxygen mo lecules within the sphalerite system,leading to the formation of ***,sulfite ions hardly depressed the flotation of ga lena and co.ld promote the flotation of galena to some *** study deepened the understanding of the depression mechanism o sulfite ions on sphalerite and Pb^(2+)activated sphalerite.

关键词： sphalerite galena sulfite ion density functional theory depression mechanism

A co.parison of co.e–shell Si/C and embedded structure Si/C co.posites as negative materials for lithium-ion batteries

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Rare Metals 2021年第9期40卷 2440-2446页

作者： Shuai-Jin Wu Zhao-Hui Wu Sheng Fang Xiao-Peng Qi Bing Yu Juan-Yu Yang Grinm group co. Ltd.Beijing 100088China general research institute for Nonferrous Metals Beijing 100088China china Automotive Battery research institute co. Ltd.Beijing 101407China

Silico. materials have attracted wide attention as negative materials due to exceptional gravimetric capacity and abundance. The strategy of using nano-silico. materials as structural units to co.struct nano/micro-structured silico.-based negative materials for lithium-ion batteries has co.e into sight in recent years. In order to provide guidance for the material structure design of micro-sized silico.-based negative materials in practical application, in this work, two co.mercialized nano/micro-structured silico.-based negative materials with a specific capacity of about 650 mAh·g^(-1) were investigated and co.pared in the aspects of material microstructure, electrochemical performance of half cells, and electrode morphological evolution during cycling. The cycling performance(with capacity retention ratio of about 17% higher after 100 cycles) and electrode structure maintenance of the embedded structure Si/C material are superior to those of co.e–shell Si/C material. This research can provide guidance on design and application of nano/micro-structured silico.-based negative materials.

关键词： Lithium-ion battery Negative materials Silico.-based materials Material structure

Tire Dynamics Modeling Method Based on Rapid Test Method

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Chinese Journal of Mechanical Engineering 2020年第6期33卷 228-237页

作者： Dang Lu Lei Lu Haidong Wu Wei Wang Manyi Lv State Key Laboratory of Automotive Simulation and co.trol Jilin UniversityChangchun130025China general R&D institute of china Department Experiment Unit FAW Group Co.LTDChangchun130013China

co.bined with the tire dynamics theoretical model,a rapid test method to obtain tire lateral and longitudinal both steady-state and transient characteristics only based on the tire quasi-steady-state test results is *** steady state data extraction,the test time of the rapid test method is half that of the co.ventional test *** transient tire characteristics the rapid test method omits the traditional tire test *** the mean time the accuracy of the two method is much *** rapid test method is explained theoretically and the test process is *** key parameters of tire are extracted and the co.parison is made between rapid test and traditional test *** result show that the identification accuracy based on the rapid test method is almost equal to the accuracy of the co.ventional ***,the heat generated during the rapid test method and that generated during the co.ventional test are calculated *** co.parison shows that the heat generated during the rapid test is much smaller than the heat generated during the co.ventional test *** benefits to the reduction of tire wear and the co.sistency of test ***,it can be co.cluded that the fast test method can efficiently,accurately and energy-efficiently measure the steady-state and transient characteristics of the tire.

关键词： Tire dynamics modeling Rapid test method Tire steady-state and transient characteristics Identificationof tire characteristics parameterg

Near-microsco.ic grain boundary facilitates fatigue crack propagation in a polycrystalline Al–Zn–Mg–Cu alloy

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Progress in Natural Science:Materials International 2023年第1期33卷 120-125页

作者： Kai Wen Xiwu Li Baiqing Xiong Haitao Lin Qinghong Wen Yanan Li Hongwei Yan Lizhen Yan Yongan Zhang Zhihui Li Hongwei Liu State Key Laboratory of Nonferrous Metals and Processes China GRINM Group Co. LTD. GRIMAT Engineering institute co. LTD. general research institute for Nonferrous Metals Southwest Aluminum(group) co. Ltd.

In present study, grain characteristics with sizes within 10–30 μm were fabricated from a same Al–Zn–Mg–Cu alloy, FCP behaviors of the alloys with small grain(SG alloy), medium grain(MG alloy) and large grain(LG alloy)were investigated and related fatigue fracture morphology was analyzed. With the enhancement of stress intensity factor range(ΔK), the alloy with larger grains possessed faster FCP rate, which were successively arranged as SG alloy > MG alloy > LG alloy at initial stage while turned to LG alloy > MG alloy > SG alloy at final stage for the stable expanding region. Except for co.ventional characteristics of striations, tearing ridges, seco.dary cracks,seco.d phases, voids and dimples, more prominent grain boundary features appeared on fracture surface, especially for MG and LG alloy. The calculation of cyclic plastic zone(CPZ) sizes proved that grain boundary participated and promoted FCP behavior when CPZ co.ered grain and grain boundary together.

关键词： Fatigue crack propagation Grain size Grain boundary Cyclic plastic zone Al–Zn–Mg–Cu alloy

Effect of Bi/Si Ratio of BiBSi Glass on Its Structure,Properties and Laser Sealing Shear Strength for Vacuum Glazing

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期 13-24页

作者：刘伟 JIAO Jinxu LUO Dusha ZHOU Junjie SHI Lifen WANG Weiwei LI Changqing WANG Peng XIONG Dehua 李宏 State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Silica-Based Materials Laboratory of Anhui Province CNBM Research Institute for Advanced Glass Materials Group Co. Ltd State Key Laboratory of Advanced Technology for Float Glass CNBM Research Institute for Advanced Glass Materials Group Co. Ltd

The low-melting glass of Bi2O3-B2O3-SiO2（BiBSi） system was used for the first time for laser sealing of vacuum *** the co.dition of co.stant boron co.tent,how the structure and properties vary with Bi/Si ratio in low-melting glass was *** addition,the relationships between laser power,low-melting glass solder with different Bi/Si ratios and laser sealing shear strength were *** results show that a decrease in the Bi/Si ratio can cause a co.traction of the glass network of the low-melting glass,leading to an increase of its characteristic temperature and a decrease of its co.fficient of thermal *** laser sealing,the co.per ions in the low-melting glass play an endothermic role.A change in the Bi/Si ratio will affect the valence state transition of the co.per ions in the low-melting *** absorbance of the low-melting glass does not follow the expected co.relation with the Bi/Si ratio,but shows a linear co.relation with the co.tent of divalent co.per *** greater the co.centration of divalent co.per ions,the greater the absorbance of the low-melting glass,and the lower the laser power required for laser *** shear strength of the low melting glass solder after laser sealing was tested,and it was found that the maximum shear strength of Z1 glass sample was the highest up to 2.67 MPa.

关键词：

Evaluation of forming limit in visco.s pressure forming of automotive aluminum alloy 6k21-T4 sheet

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中国有色金属学会会刊：英文版 2007年第6期17卷 1169-1174页

作者：王忠金李毅刘建光张义和 School of Materials Science and Engineering Harbin Institute of Technology research and Development Center China FAW Group Corporation

A ductile fracture criterion is introduced into numerical simulation to predict visco.s pressure forming limit of the automotive body aluminum alloy 6k21-T4. The material co.stant in the ductile fracture criterion is determined by the co.bination of the visco.s pressure bulging (VPB) test with numerical simulation. VPB tests of the aluminum alloy sheet are carried out by using various elliptical dies with different ratios of major axis to minor axis(β), and the bugling processes are simulated by the aid of the finite element method software LS-DYNA3D. On the basis of the stress and strain calculated from numerical simulations, the forming limits of bulging specimens obtained are predicted by the ductile fracture criterion, and co.pared with experimental results. The fracture initiation site and the minimal thickness predicted by the ductile fracture criterion are in good agreement with the experimental results.

关键词：铝合金薄片延展断裂有限远元分析机械性质

Advances in co.tolerant anode catalysts for proton exchange membrane fuel cells

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Progress in Natural Science:Materials International 2024年第4期34卷 654-675页

作者： Ling Liu Rong Zeng Lei Hao National Engineering research Center of Nonferrous Metals Materials and Products for New Energy China GRINM Group Co. Ltd. GRIMAT Engineering institute co. Ltd. general research institute for Nonferrous Metals

Pt-based catalysts are often used in a proton exchange membrane fuel cell due to their high activities to oxygen reduction and hydrogen oxidation reaction. However, these catalysts are easily poisoned by co. resulting in a significant reduction of fuel cell performance. The use of co.tolerant catalysts can effectively solve this *** co.poisoning mechanism and anti-poisoning strategies were briefly discussed in this article. It mainly focused on the research progress on co.tolerant catalysts in three aspects: Pt alloy catalysts, metal oxide co.posite catalysts, and blocking layer co.ered catalysts. The advantages and limitations of various catalysts in recent years were also discussed. Creating a porous blocking layer co.ered on the surface of the catalyst can effectively enhance the co.tolerance of the catalysts which co.ld be a promising approach for developing anti-poison catalysts other than co.tolerance. Finally, the prospects for future development of co.tolerant fuel cell catalysts were described.

关键词： PEMFCs co.tolerance Catalysts

Magnetic properties and magnetization mechanism of anisotropic NdFeB/SmFeN hybrid bonded magnets prepared with different co.rcivity NdFeB powders

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Journal of Rare Earths 2023年第9期41卷 1353-1359,I0003页

作者： Qisong Luo Yang Luo Zilong Wang Haijun Peng Wenlong Yan Wenjian Yan Tianhao Li Shengjie Zhu Dunbo Yu National Engineering research Center for Rare Earth GRINM Group Co.LtdBeijing 100088China GRIREM Advanced Materials co. LtdBejing 100088China general research institute for Nonferrous Metals Beijing 100088China

Anisotropic NdFeB/SmFeN hybrid bonded magnets were prepared by warm co.paction process under an orientation magnetic field of 22 kOe,mixing with anisotropic SmFeN powders in different addition and HDDR-NdFeB powders in different *** the addition of 20 wt% SmFeN,the density and remanence of hybrid magnets increase from 5.58 g/cm~3,8.4 kGs to 6.02 g/cm~3,9.0 kGs,*** as the addition amount of SmFeN powders varies from 20 wt% to 40 wt%,the maximum energy product changes less than 0.5 *** addition,the magnetization process and the interactions between two powders were *** is found that the magnetization process of anisotropic NdFeB powders shows distinction in different initial *** addition of SmFeN powders promotes the rotation of NdFeB powders together with applied field,which is beneficial to the degree of alignment of NdFeB *** of the micron-sized long range co.pling effect,the co.rcivity of hybrid magnets decreases slowly with the increase of low co.rcivity ***,the magnetization process of hybrid magnets is different from pure magnets,it increases rapidly at low field and then slowly,next leads to rapidity again and achieves the saturation magnetization finally.

关键词： Anisotropic hybrid bonded magnet NdFeB/SmFeN co.pling effect Magnetization process co.rcivity Rare earths

Effect of the Addition of High Li co.centration on the Microstructure and Mechanical Properties of Al-Mg-Si Alloys with Different Mg co.tents

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Acta Metallurgica Sinica(English Letters) 2021年第12期34卷 1721-1733页

作者： Xiao-Kun Yang Bai-Qing Xiong Xi-Wu Li Li-Zhen Yan Zhi-Hui Li Yong-An Zhang Ya-Nan Li Kai Wen State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.LtdBeijing 100088China GRIMAT Engineering institute co. LTDBeijing 101407China general research institute for Nonferrous Metals Beijing 100088China

In the present work,the microstructural characteristics and mechanical properties of Al-1.5 Mg-0.6Si and Al-3.0 Mg-0.6Si alloy co.taining 3 wt%Li were investigated by optical microsco.y(OM),X-ray diffraction analysis(XRD),scanning electron microsco.y(SEM),time of flight-seco.dary ion mass spectrometry(SIMS),transmission electron microsco.y(TEM),and mechanical performance *** addition of Li reduces the density of the base alloy by up to 8.4%.The residual seco.d phases co.tain Mg and Si in the hot-rolled co.dition,but the Mg/Si atomic ratio decreases after quenching,which means that Li substitute some of the Mg and co.vert Mg_(2)Si into a(Mg,Li)_(2)Si phase during solution *** results of SIMS observations co.firm *** high Mg-co.taining alloy has a more rapid hardening response co.pared to the low Mg-co.taining *** observation reveals that theδ′-Al3Li+β′′-Mg_(2)Si dual phases can be observed in the high Mg-co.taining alloy after aging for 100 h at 170°*** higher Mg co.tent enhances the precipitation of theδ′phase,which results in the high Mg-co.taining alloy having a larger average diameter size ofδ′particles and widerδ′-precipitate-free zones(δ′-PFZs).The mechanical properties are significantly improved with the elastic modulus increasing by more than 16.5%.However,the existence of large seco.d phases and wideδ′-PFZs in Li-co.taining alloys is detrimental to their ductility;as a result,their elongation is much lower than that of the base alloy.

关键词： Al-Mg-Si alloy Li addition Microstructure Aging behavior Mechanical properties Seco.dary ion mass spectrometer