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Viscosity and structure relationship with equimolar substitution of CaO with MgO in the CaO–MgO–Al_(2)O_(3)–SiO_(2)slag melts

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International Journal of Minerals,metallurgy and materials 2025年第1期32卷 70-79页

作者： Yong Hou Shuo Zhang Jie Dang Jia Guo Hanghang Zhou Xuewei Lü College of materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Vanadium-Titanium metallurgy and New materials Chongqing UniversityChongqing 400044China

Currently,the Al_(2)O_(3)content in the high-alumina slag systems within blast furnaces is generally limited to 16wt%–18.5wt%,making it challenging to overcome this *** most studies that concentrated on managing the MgO/Al_(2)O_(3)ratio or basicity,this paper explored the effect of equimolar substitution of MgO for CaO on the viscosity and structure of a high-alumina CaO-MgO-Al_(2)O_(3)-SiO_(2)slag system,providing theoretical guidance and data to facilitate the application of high-alumina *** results revealed that the viscosity first decreased and then increased with higher MgO substitution,reaching a minimum at 15mol%MgO *** transform infrared spectroscopy(FTIR)results found that the depths of the troughs representing[SiO_(4)]tetrahedra,[AlO_(4)]tetrahedra,and Si-O-Al bending became progressively deeper with increased MgO *** of the Raman spectra showed that the average number of bridging oxygens per Si atom and the X_(Q^(3))/X_(Q^(2))(X_(Q^(i))is the molar fraction of Q^(i) unit,and i is the number of bridging oxygens in a[SiO_(4)]tetrahedral unit)ratio increased from 2.30 and 1.02 to 2.52 and 2.14,respectively,indicating a progressive polymerization of the silicate structure.X-ray photoelectron spectroscopy(XPS)results highlighted that non-bridging oxygen content decreased from 77.97mol% to 63.41mol% with increasing MgO concentration,whereas bridging oxygen and free oxygen contents *** analysis demonstrated a gradual increase in the polymerization degree of the tetrahedral structure with the increase in MgO ***,bond strength is another important factor affecting the slag *** occurrence of a viscosity minimum can be attributed to the complex evolution of bond strengths of non-bridging oxygens generated during depolymerization of the[SiO_(4)]and[AlO_(4)]tetrahedral structures by CaO and MgO.

关键词： aluminosilicate viscosity structure spectroscopy

Microstructure and electrochemical hydrogen storage properties of nanosized doped La_(2)Ti_(2)O_(7) solid solutions

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Journal of Rare Earths 2025年第2期43卷 354-361,I0005页

作者： Guofang Zhang Jianyi Xu Shilong Sun Yiming Li Zhuocheng Liu Ruihua Guo Zhiyong Yang Lu Bai Yanghuan Zhang School of materials and metallurgy Inner Mongolia University of Science and TechnologyBaotouO14010China

Hydrothermal-sintering method was employed to obtain pure and Li,Co,Mn,Cu and Zn doped La_(2)Ti_(2)O_(7) solid *** substitution sites of doping ions are discussed.X-ray diffraction(XRD)results indicate that the doped ions were incorporated into the lattice of La_(2)Ti_(2)O_(7) *** electron microscopy(TEM)measurements prove that the doped ions with smaller radius induce the contraction of *** re sults of UV and photo luminescence(PL)tests show that the doped ions cause the red-shift of band gap energies and enhance the concentrations of oxygen vacancies and *** electrochemical hydrogen storage properties of the samples were measured at 303 and 333 K,*** discharge capacities of the doped samples keep growing by increasing the cycle number at 333 ***,the doped samples possess better kinetic performances than the pure La_(2)Ti_(2)O_(7).Among the samples,the Mn,Co and Li ions doped samples exhibit better electrochemical hydrogen storage *** hydrogen storage properties are closely related with the characteristics of doped ions,crystallite sizes,the content of the oxygen vacancies and defects in the lattice of La_(2)Ti_(2)O_(7).

关键词： Rare earths Doped La_(2)Ti_(2)O_(7) Electrochemical hydrogen storage property Discharge capacity Oxygen vacancy

Effective stress dissipation by multi-dimensional architecture engineering for ultrafast and ultralong sodium storage

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Journal of Energy Chemistry 2025年第2期101卷 619-629页

作者： Man Zhang Jing Zhu Qianqian Li Fenghua Zheng Sijiang Hu Youguo Huang Hongqiang Wang Xing Ou Qichang Pan Qingyu Li Guangxi Key Laboratory of Low Carbon Energy materials School of Chemistry and Pharmaceutical Sciences Guangxi Normal University School of metallurgy and Environment Central South University

Stress accumulation is a key factor leading to sodium storage performance deterioration for NiSe2-based ***,inhibiting the concentrated local stress during the sodiataion/desodiation process is crucial for acquiring stable NiSe2-based materials for sodium-ion batteries（SIBs）,Herein,a stress dissipation strategy driven by architecture engineering is proposed,which can achieve ultrafast and ultralong sodium storage *** from the conventional sphere-like or rod-like architecture,the three-dimensional（3D） flower-like NiSe2@C composite is delicately designed and assembled with onedimensional nanorods and carbon *** importantly,the fundamental mechanism of improved structure stability is unveiled by simulations and experimental results *** demonstrates that this designed multidimensional flower-like architecture with dispersed nanorods can balance the structural mismatch,avoid concentrated local strain,and relax the internal stress,mainly induced by the unavoidable volume variation during the repeated conversion ***,it can provide more Na+-storage sites and multi-directional migration pathways,leading to a fast Na+-migration channel with boosted reaction *** expected,it delivers superior rate performance(441 mA h g-1at 5.0 A g-1) and long cycling stability(563 mA h g-1at 1.0 A g-1over 1000 cycles) for *** work provides useful insights for designing high-performance conversion-based anode materials for SIBs.

关键词： Conversion-based anodes Multi-dimensional architecture Sodium-ion batteries Stress dissipation Structure engineering

Phase equilibria of Fe_(3)O_(4)-Cr_(2)O_(3)-CaO system:experimental measurements and thermodynamic calculations

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Journal of Iron and Steel Research International 2025年第1期32卷 95-104页

作者： Ao Zhu Chen-ying Shi Pei-yuan Ni Teng-fei Deng State Key Laboratory of Silicate materials for Architectures Wuhan University of TechnologyWuhan 430070HubeiChina College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083HunanChina Key Laboratory of Ecological metallurgy of Multi-Metal Intergrown Ores of Education Ministry School of MetallurgyNortheastern UniversityShenyang 110819LiaoningChina

Understanding the phase equilibria of the Fe_(3)O_(4)-Cr_(2)O_(3)-CaO system is essential for the efficient recycling of stainless steel pickling *** isothermal section of this system at 1473 K under oxygen partial pressure of 0.15 Pa was *** experiments on the relevant binary systems were conducted using a combination of equilibrium-quenching techniques,X-ray diffraction,high-resolution transmission electron microscope,and electron probe *** systems were rigorously assessed using the CALPHAD(CALculation of Phase Diagram)method,incorporating the present experimental *** liquid phase was modeled using the ionic two-sublattice model,represented as(Ca^(2+),Cr^(3+),Fe^(2+))P(O_(2)^(-),Va,FeO_(1.5))Q,where Va represents vacancy,and P and Q denote the number of sites on the cation and anion sublattices,*** ensure electroneutrality,the values of P and Q adjust according to the composition of the *** this,the isothermal section of the Fe_(3)O_(4)-Cr_(2)O_(3)-CaO system at 1473 K under the specified oxygen partial pressure was obtained based on the thermodynamic parameters of the binary *** present experimental data and calculation results hold significant implications for the comprehensive recycling of stainless steel pickling sludge.

关键词： Fe_(3)O_(4)-Cr_(2)O_(3)-CaO system Ionic two-sublattice model Phase equilibria CALPHAD

Phase equilibria of slag systems“FeO”−SiO_(2)−CaO−Al_(2)O_(3)and“FeO”−SiO_(2)−CaO−MgO at 1200℃and p(O_(2))of 10^(−7)kPa

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Transactions of Nonferrous Metals Society of China 2025年第1期35卷 338-348页

作者： Sui XIE Qin-meng WANG Xue-yi GUO Chun-fa LIAO Bao-jun ZHAO Faculty of materials Metallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou 341000China National Rare Earth Functional Material Innovation Center Ganzhou 341000China School of metallurgy and Environment Central South UniversityChangsha 410083China Sustainable Minerals Institute The University of QueenslandBrisbane 4072Australia

High-temperature experiments were carried out for the slag systems of“FeO”−SiO_(2)−CaO−Al_(2)O_(3)and“FeO”−SiO_(2)−CaO−MgO at 1200℃and p(O_(2))of 10^(−7)*** equilibrated samples were quenched,and the phase compositions were measured by electron probe microanalysis(EPMA).A series of pseudo-ternary and pseudo-binary phase diagrams are constructed to demonstrate their applications in copper smelting process and evaluation of the thermodynamic *** and tridymite are identified to be the major primary phases in the composition range related to the copper smelting *** is found that the operating window of the smelting slag is primarily determined by w_(Fe)/w_(SiO_(2))ratio in the *** MgO and Al_(2)O_(3)in the slag reduce the operating window which requires extra fluxing agent to keep the slag to be fully *** spinel solid solutions cause inaccurate predictions of the current thermodynamic database.

关键词： phase equilibrium “FeO”−SiO_(2)−CaO−Al_(2)O_(3)slag system “FeO”−SiO_(2)−CaO−MgO slag system oxygen partial pressure copper smelting slag FactSage

Low-temperature chlorination roasting technology for the simultaneous recovery of valuable metals from spent LiCoO_(2)cathode material

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International Journal of Minerals,metallurgy and materials 2025年第1期32卷 80-91页

作者： Junjie Shi Changle Hou Jingjing Dong Dong Chen Jianzhong Li Key Laboratory for Ecological metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of metallurgy Northeastern UniversityShenyang 110819China

With the continuous increase in the disposal volume of spent lithium-ion batteries(LIBs),properly recycling spent LIBs has become essential for the advancement of the circular *** study presents a systematic analysis of the chlorination roasting kinetics and proposes a new two-step chlorination roasting process that integrates thermodynamics for the recycling of LIB cathode *** activation energy for the chloride reaction was 88.41 kJ/mol according to thermogravimetric analysis–derivative thermogravimetry data obtained by using model-free,model-fitting,and Z(α)function(αis conversion rate).Results indicated that the reaction was dominated by the first-order(F1)model when the conversion rate was less than or equal to 0.5 and shifted to the second-order(F2)model when the conversion rate exceeded *** conditions were determined by thoroughly investigating the effects of roasting temperature,roasting time,and the mass ratio of NH_(4)Cl to LiCoO_(2).Under the optimal conditions,namely 400℃,20 min,and NH_(4)Cl/LiCoO_(2)mass ratio of 3:1,the leaching efficiency of Li and Co reached 99.43% and 99.05%,*** of the roasted products revealed that valuable metals in LiCoO_(2)transformed into CoCl_(2) and ***,the reaction mechanism was elucidated,providing insights for the establishment of a novel low-temperature chlorination roasting technology based on a crystal structure *** technology can guide the development of LIB recycling processes with low energy consumption,low secondary pollution,high recovery efficiency,and high added value.

关键词： spent lithium-ion battery thermodynamics chlorination roasting kinetics circular economy

Tunable siloxane-induced amphiphilic interphase for high-performance gel polymer-based sodium metal batteries

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Science Bulletin 2025年第3期70卷 317-322页

作者： Jialin Lin Weiping Li Pei Huang Suting Weng Tuoya Naren Chengzuo Gong Chaoping Liang Weijie Li Yuejiao Chen Libao Chen Chunxiao Zhang Xuefeng Wang Weifeng Wei State Key Laboratory of Powder metallurgy Central South UniversityChangsha 410083China Laboratory for Advanced materials and Electron Microscopy Institute of PhysicsChinese Academy of SciencesBeijing 100190China

The ever-growing pursuit for high-energy and low-cost rechargeable batteries has driven the ceaseless research on sodium metal batteries(SMBs)with metallic Na anode,a low redox potential of-2.71 V(*** hydrogen electrode),and a high specific capacity of 1166 mAh ***,its hyperreactivity with liquid electrolytes can cause uncontrollable parasitic reactions and raise safety ***,gel polymer electrolytes(GPEs)in SMBs have attracted immense interest owing to their high energy densities and high safety standards[1],[2].

关键词： polymer pursuit performance

Interfacial Zn^(2+)-solvation regulator towards reversible and stable Zn anode

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Journal of Energy Chemistry 2025年第1期100卷 684-692页

作者： Miao Zhou Xiongbin Luo Hang Li Shan Guo Zhuang Tong Xiaotao Zhou Xu Li Zhaohui Hou Shuquan Liang Guozhao Fang College of Mechanical Engineering Key Laboratory of Hunan Province for Advanced Carbon-based Functional MaterialsHunan Institute of Science and TechnologyYueyang 414006HunanChina School of materials Science and Engineering Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan ProvinceCentral South UniversityChangsha 410083HunanChina College of materials and metallurgy Guizhou UniversityGuiyang 550000GuizhouChina National Energy Metal Resources and New materials Key Laboratory Central South UniversityChangsha 410083HunanChina

Aqueous zinc-ion batteries (AZIBs) are fundamentally challenged by the instability of the electrode/electrolyte interface,predominantly due to irreversible zinc (Zn) deposition and hydrogen ***,the intricate mechanisms behind the electrochemical discrepancies induced by interfacial Zn^(2+)-solvation and deposition behavior demand comprehensive *** molecules endowed with special functional groups (such as hydroxyl,carboxyl,etc.) have the potential to significantly optimize the solvation structure of Zn^(2+)and regulate the interfacial electric double layer (EDL).By increasing nucleation overpotential and decreasing interfacial free energy,these functional groups facilitate a lower critical nucleation radius,thereby forming an asymptotic nucleation model to promote uniform Zn ***,this study presents a pioneering approach by introducing trace amounts of n-butanol as solvation regulators to engineer the homogenized Zn (H-Zn) anode with a uniform and dense *** interfacial reaction and structure evolution are explored by in/ex-situ experimental techniques,indicating that the H-Zn anode exhibits dendrite-free growth,no by-products,and weak hydrogen evolution,in sharp contrast to the bare ***,the H-Zn anode achieves a remarkable Zn utilization rate of approximately 20% and simultaneously sustains a prolonged cycle life exceeding 500 ***,the H-Zn//NH_(4)V_(4)O^(10)(NVO) full battery showcases exceptional cycle stability,retaining 95.04%capacity retention after 400 cycles at a large current density of 5 A g^(-1).This study enlightens solvation-regulated additives to develop Zn anode with superior utilization efficiency and extended operational lifespan.

关键词： Aqueous zinc-ion batteries Zn^(2+)-solvation structure Interfacial reaction Asymptotic nucleation model Reversible and stable Zn anode

Role of iron ore in enhancing gasification of iron coke:Structural evolution,influence mechanism and kinetic analysis

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International Journal of Minerals,metallurgy and materials 2025年第1期32卷 58-69页

作者： Jie Wang Wei Wang Xuheng Chen Junfang Bao Qiuyue Hao Heng Zheng Runsheng Xu School of Chemistry and materials Science Hubei Engineering UniversityXiaogan 432000China Key Laboratory for Ferrous metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081China Institue of Ironmaking Technology Baosteel Central Research InstituteShanghai 201999China State Key Laboratory of Advanced metallurgy University of Science and Technology BeijingBeijing 100083China

The utilization of iron coke provides a green pathway for low-carbon *** uncover the influence mechanism of iron ore on the behavior and kinetics of iron coke gasification,the effect of iron ore on the microstructure of iron coke was ***,a comparative study of the gasification reactions between iron coke and coke was conducted through non-isothermal thermogravimetric *** findings indicate that compared to coke,iron coke exhibits an augmentation in micropores and specific surface area,and the micropores further extend and *** provides more adsorption sites for CO_(2) molecules during the gasification process,resulting in a reduction in the initial gasification temperature of iron *** the heating rate in non-isothermal gasification can enhance the reactivity of iron *** metallic iron reduced from iron ore is embedded in the carbon matrix,reducing the orderliness of the carbon structure,which is primarily responsible for the heightened reactivity of the carbon *** kinetic study indicates that the random pore model can effectively represent the gasification process of iron coke due to its rich pore ***,as the proportion of iron ore increases,the activation energy for the carbon gasification gradually decreases,from 246.2 kJ/mol for coke to 192.5 kJ/mol for iron coke 15wt%.

关键词： low-carbon ironmaking iron coke gasification structural evolution kinetic model