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reaction behavior and non-isothermal kinetics of suspension magnetization roasting of limonite and siderite

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International Journal of Minerals,Metallurgy and Materials 2023年第5期30卷 824-833页

作者： Qiang Zhang Yongsheng Sun Yuexin Han Yanjun Li Peng Gao School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China National-local Joint Engineering Research Center of High-efficient exploitation technology for Refractory Iron Ore Resources Shenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

In order to develop limonite and decrease CO_(2) emissions,siderite is proposed as a clean reductant for suspension magnetization roasting(SMR) of *** iron concentrate(iron grade:65.92wt%,iron recovery:98.54wt%) was obtained by magnetic separation under the optimum SMR conditions:siderite dosage 40wt%,roasting temperature 700℃,roasting time 10 *** to the magnetic analysis,SMR achieved the conversion of weak magnetic minerals to strong magnetic minerals,thus enabling the recovery of iron via magnetic *** on the phase transformation analysis,during the SMR process,limonite was first dehydrated and converted to hematite,and then siderite decomposed to generate magnetite and CO,where CO reduced the freshly formed hematite to *** microstructure evolution analysis indicated that the magnetite particles were loose and porous with a destroyed structure,making them easier to be *** non-isothermal kinetic results show that the main reaction between limonite and siderite conformed to the two-dimension diffusion mechanism,suggesting that the diffusion of CO controlled the *** results encourage the application of siderite as a reductant in SMR.

关键词： reaction behavior non-isothermal kinetics suspension magnetization roasting siderite limonite CO_(2)emissions

reaction behavior of associated rare earth minerals during coal-based reduction

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Rare Metals 2014年第5期33卷 628-632页

作者： Peng Gao Zhi-Hang Li Yue-Xin Han Yong-Sheng Sun College of Resources and Civil Engineering Northeastern University

In order to ascertain the reaction behavior of rare earth minerals in coal-based reduction, X-ray diffraction（XRD）, scanning electron microscopy（SEM）, and energy dispersive spectroscopy（EDS） analyses were applied to investigate the rare earth minerals in Bayan *** occurrence state and regularity of rare earth elements were analyzed under different reduction time. The results reveal that rare earth elements in rare earth minerals exist in RE（CO3）F（bastnaesite） and REPO4（monazite）. In this research, at 1,498 K with a C/O molar ratio（i.e., molar ratio of fixed carbon in the coal to reducible oxygen in the ore） of2.5, rare earth minerals primarily decompose into RE2O3at5 min. When the time is extended to 10 min, solid-phase reactions occur among RE2O3, CaO, and SiO2, and the resultant is cerium wollastonite（CaO·2RE2O3·3SiO2）. At reaction time 〉20 min, rare earth elements mainly exist in cerium wollastonite（CaO·2RE2O3·3SiO2）, and the grain size varies in the range of 10–30 μm. The results show that coal-based reduction is efficient to recover rare earth minerals in reduced materials.

关键词： Coal-based reduction Rare earth minerals reaction behavior

Microstructure evolution and reaction behavior of Cu–Ni alloy and B4C powder system

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Progress in Natural Science:Materials International 2021年第1期31卷 55-62页

作者： Lei Jia Ming-fang Yang Zhen-lin Lu Jin Xu Hui Xie Katsuyoshi Kondoh School of Materials Science and Engineering Xi'an University of Technology School of Materials Engineering Xi'an Aeronautical University Joining and Welding Research Institute Osaka University

Microstructure evolution and reaction behavior of Cu–Ni alloy and B4C power system was studied by in-situ and static experimental investigations along with theoretical calculations. The reaction process was as follows. Firstly,B4C decomposed into B and C atoms, and then B atoms diffused into Cu–Ni matrix, leading to the formation of Ni2B particles. Subsequently, Ni atoms diffused into B4C, forming a loose mixture of Ni2B and amorphous C at the initial powder boundary. Finally, with the completion of reaction, Ni2B particles at the powder boundary grew into a monolithic block, and then C substance was excluded out and accumulated at the edge of this monolithic Ni2B block. It is believed that the formation of Ni2B phase is caused by the most negative change of Gibbs free energy among all the potential reactions between Ni–B and Ni–B4C systems.

关键词： Metal-matrix composites reaction behavior Microstructure evolution Cu–Ni/B 4 C composite In-situ experiment

reaction behaviors occurring in Ti/Al foil metallurgy

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Rare Metals 2016年第1期35卷 100-105页

作者： Zheng-Zhang Shen Jun-Pin Lin Yong-Feng Liang Lai-Qi Zhang Guo-Jian Hao State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing

reaction behaviors occurring in Ti/Al foil metallurgy were systematically *** emphasis was focused on the reaction between solid Al and Ti as well as subsequent reaction between TiAland Ti *** the solid reaction between Al and Ti,the presence of residual Al is mainly caused by inhomogeneous growth of TiAllayer and micro-voids existing at the ***,through reaction between molten Al and Ti,TiAl/Ti multilayer can be achieved with complete consumption of *** subsequent high-temperature heat treatment,TiAl/Ti multilayer will eventually turn into TiAl/TiAl multilayer accompanying with simultaneous formation and successive disappearance of intermediate phases,such as TiAland ***,it is found that the growth direction of TiAl layer changes as a function of annealing time between different couples in multi-intermetallics system.

关键词： reaction behavior Foil metallurgy Multilayer TiAl3 TiAl

Shock-induced reaction behaviors of functionally graded reactive material

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Defence Technology（防务技术） 2021年第5期17卷 1687-1698页

作者： Ying Yuan Zhen-yang Liu Suo He Chao Ge Qing-bo Yu Yuan-feng Zheng Hai-fu Wang Beijing Institute of Technology State Key Laboratory of Explosion Science and TechnologyBeijing100081China

In this paper,the ballistic impact experiments,including impact test chamber and impact double-spaced plates,were conducted to study the reaction behaviors of a novel functionally graded reactive material(FGRM),which was composed of polytetrafluoroethylene/aluminum(PTFE/Al)and PTFE/Al/bismuth trioxide(Bi_(2)O_(3)).The experiments showed that the impact direction of the FGRM had a significant effect on the *** the same impact velocity,when the first impact material was PTFE/Al/Bi_(2)O_(3),compared with first impact material PTFE/Al,the FGRM induced higher overpressure in the test chamber and larger damaged area of double-spaced *** theoretical model,which considered the shock wave generation and propagation,the effect of the shock wave on reaction efficiency,and penetration behaviors,was developed to analyze the reaction behaviors of the *** model predicted first impact material of the FGRM with a higher shock impedance was conducive to the reaction of reactive *** conclusion of this study provides significant information about the design and application of reactive materials.

关键词： Functionally graded reactive material PTFE/Al reaction behavior Ballistic impact experiments reaction efficiency

Research progress of nickel based filler for development of diamond tools

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China Welding 2021年第4期30卷 30-41页

作者：崔冰刘正未丁梓超 School of Materials Science and Engineering Anhui University of TechnologyMa'anshan 243032China

Owing to diamond excellent physical and chemical properties,so synthetic diamond abrasives are extensively used in manufacturing diamond tools are utilized in machining hard and brittle *** brazing technology is exploited with strong bonding force between the diamond and substrate,which can realize metallurgical and chemical bonding between the filler metals and diamond *** this paper,the research reports on nickel-based fillers for brazing diamond grains at home and abroad in recent years are reviewed systematically,with emphasis on the influence of alloying elements and active elements on the properties of nickel-based *** advantages and disadvantages of Cr,B,Si,P,Mn,Fe,Cu,W,C in nickel-based fillers and the negative effects of impurity elements were *** shortcomings in the research and application of nickel-based fillers were pointed out,which provided theoretical guidance for further systematic research and development of related technologies.

关键词： nickel-based filler diamond tools active element reaction behavior