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Numerical investigation of the interaction of the turbulent dual-jet and acoustic propagation

Chinese Physics B 2017年第2期26卷 294-304页

作者： Yi-Ming Li Bao-Kuan Li Feng-Sheng Qi Xi-Chun Wang School of metallurgy Northeastern University Shenyang 110819 China

In order to study the interaction between two independent jets, a three-dimensional（3D） transient mathematical model is developed to investigate the flow field and acoustic properties of the two-stream jets. The results are compared with those of the single-stream jet at Mach number 0.9 and Reynolds number 3600. The large eddy simulation（LES） with dynamic Smagorinsky sub-grid scale（SGS） approach is used to simulate the turbulent jet flow structure. The acoustic field is evaluated by the Ffowcs Williams–Hawkings（FW-H） integral equation. Considering the compressibility of high-speed gas jets, the density-based explicit formulation is adopted to solve the governing equations. Meanwhile, the viscosity is approximated by using the Sutherland kinetic theory. The predicted flow characteristics as well as the acoustic properties show that they are in good agreement with the existing experimental and numerical results under the same flow conditions available in the literature. The results indicate that the merging phenomenon of the dual-jet is triggered by the deflection mechanism of the Coanda effect, which sequentially introduces additional complexity and instability of flow structure. One of the main factors affecting the dual-jet merging is the aperture ratio, which has a direct influence on the potential core and surrounding flow fluctuation. The analysis on the noise pollution reveals that the potential core plays a fundamental role in noise emission while the additional mixing noise makes less contribution than the single jet noise. The overall sound pressure level（OASPL） profiles have a directive property, suggesting an approximate 25° deflection from the streamwise direction, however, shifting toward lateral direction of about 10° to 15° in the dual-jet. The conclusion obtained in this study can provide valuable data to guide the development of manufacturing-green technology in the multi-jet applications.

关键词： dual-jet jet entrainment acoustic characteristic Coanda effect

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Flotation performance and adsorption mechanism of styrene phosphonic acid as a collector to synthetic(Ce,La)2O3

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Journal of Rare Earths 2017年第6期35卷 621-628页

作者： YANG Zhiren BIAN Xue WU Wenyuan School of metallurgy Northeastern University Shenyang 110819 China

The flotation performances of styrene phosphonic acid（SPA） to synthetic（Ce,La）2O3（REO）, calcium fluorite（CaF2） and fluorapatite（Ca5F（PO4）3） were investigated by flotation tests, flotation of synthetic mixed mineral, the surface adsorption capacity and the polarizing microscopy to solve the flotation separation problem of rare earth oxides from roasted concentrate. The flotation test results indicated that compared with CaF2 and Ca5F（PO4）3, SPA exhibited superior collecting performance to direct flotation recovery of REO and floated out above 90% REO at pH 3–6. However, the collecting ability of SPA to CaF2 and Ca5F（PO4）3 was extremely weak and the highest recovery was only 20% at pH 2–11. The flotation of synthetic mixed mineral showed that SPA was a good collector reagent for flotation of synthetic REO at pH 5, so REO, CaF2 and Ca5F（PO4）3 could be separated from roasted concentrate by using SPA as a collector. The surface adsorption capacity tests and polarizing microscopy results confirmed that SPA was adsorbed on REO surface, while CaF2 and Ca5F（PO4）3 were not. The adsorption mechanism of SPA to synthetic REO was studied by solution chemistry analysis of collector, the ζ-potential tests, infrared spectroscopy and X-ray photoelectron spectroscopy（XPS） analyses. The results indicated that SPA was physically adsorbed onto REO surface, which exhibited excellent flotation selectivity to REO against CaF2 and Ca5F（PO4）3.

关键词： flotation collector Ce La styrene adsorbed photoelectron concentrate selectivity collecting Adsorption

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Effect and function mechanism of sinter basicity on softening-melting behaviors of mixed burden made from chromium-bearing vanadium-titanium magnetite

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Journal of Central South university 2017年第1期24卷 39-47页

作者：王宏涛赵伟储满生汪燃柳政根薛向欣 School of metallurgy Northeastern UniversityShenyang 110819China

The effect of sinter basicity on softening-melting behaviors of mixed burden made from chromium-bearing vanadium-titanium magnetite(Cr-V-Ti magnetite) was investigated and the function mechanism was simultaneously *** results show that with increasing sinter basicity from 1.71 to 2.36,the softening interval tends to increase from 149.3 ℃ to 181.7 ℃while the melting interval tends to decrease from 178.0 ℃ to 136.7 ℃.The location of cohesive zone moves downwards firstly and then ascends slightly,but the cohesive zone becomes *** softening-melting characteristic value becomes small,which indicates that the permeability of burden column is *** dripping ratio of mixed burden tends to increase firstly and then decrease,which comes to the highest value of 74.50%when the sinter basicity is *** content and the recovery of V and Cr in dripping iron are all *** generation amount of components with high melting point in slag becomes little with the increase of sinter basicity,which could improve the permeability of mixed *** softening-melting behaviors of mixed burden and recovery of valuable elements into account,the proper sinter basicity is no less than 2.13 for smelting mixed burden made from Cr-V-Ti magnetite in blast furnace.

关键词： blast furnace sinter basicity Cr-V-Ti magnetite softening-melting behaviors cohesive zone function mechanism

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Deep eutectic solvents for separation and purification applications in critical metal metallurgy:Recent advances and perspectives

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International Journal of Minerals,metallurgy and Materials 2025年第1期32卷 1-19页

作者： Shuo Chen Shengpeng Su Yanfang Huang Bingbing Liu Hu Sun Shuzhen Yang Guihong Han School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China Zhongyuan Critical Metals Laboratory Henan ProvinceZhengzhou 450001China

Solvent extraction,a separation and purification technology,is crucial in critical metal *** solvents commonly used in solvent extraction exhibit disadvantages,such as high volatility,high toxicity,and flammability,causing a spectrum of hazards to human health and environmental *** solvents have been recognized as potential alternatives to these harmful organic *** the past two decades,several neoteric solvents have been proposed,including ionic liquids(ILs)and deep eutectic solvents(DESs).DESs have gradually become the focus of green solvents owing to several advantages,namely,low toxicity,degradability,and low *** this critical review,their classification,formation mechanisms,preparation methods,characterization technologies,and special physicochemical properties based on the most recent advancements in research have been systematically ***,the major separation and purification applications of DESs in critical metal metallurgy were comprehensively ***,future opportunities and challenges of DESs were explored in the current research *** conclusion,this review provides valuable insights for improving our overall understanding of DESs,and it holds important potential for expanding separation and purification applications in critical metal metallurgy.

关键词： deep eutectic solvents preparations properties separation and purification critical metal metallurgy

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Diffusion coefficient of Ti^4+ in calcium ferrite/calcium titanate diffusion couple

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International Journal of Minerals,metallurgy and Materials 2020年第9期27卷 1216-1225页

作者： Wang Wei Hong-rui Yue Xiang-xin Xue School of metallurgy Northeastern UniversityShenyang 110819China

This study investigated the interdiffusion of calcium ferrite/calcium titanate system in the time range of 0-120 min by the diffusion couple method in a CO/N2 reducing atmosphere at 700℃.The results show that after the diffusion reaction occurred,no longitudinal agglomerations were present on the substrate surface on the calcium titanate *** the diffusion time was increased to 105 min,a net vacancy flow from calcium titanate to calcium ferrite might have occurred,causing the surface of the calcium ferrite substrate to *** thickness of the diffusion layer of the calcium ferrite/calcium titanate system was about 17-48μm,which conforms to the parabolic law of *** diffusion coefficient and the Ti^4+concentration in the calcium ferrite/calcium titanate system are *** shows an increase in the diffusion coefficient with the increase of Ti^4+concentration,and the diffusion coefficient value was in the range of 10^−12-10^−11 cm^2·s^−1.

关键词： vanadium-titanium sinter diffusion couple calcium ferrite calcium titanate diffusion coefficient

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Highly efficient removal of ozone by amorphous manganese oxides synthesized with a simple hydrothermal method

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Journal of Environmental Sciences 2023年第12期134卷 96-107页

作者： Hong Zhao Aijie Wang Qiuyan Zhang Chong Han School of metallurgy Northeastern UniversityShenyang 110819China

Amorphous manganese oxides (MnO_(x)) were synthesized by facile hydrothermal reactions between potassium permanganate and manganese *** parameters,including hydrothermal time and temperature and molar ratio of precursors,significantly affected the ozone removal performance and structure property of MnO_(x).Amorphous MnO_(x)-1.5,which was prepared at the Mn^(2+)/Mn^(7+)molar ratio of 1.5 under hydrothermal conditions of 120℃ and 2 hr,showed the highest ozone removal rate of 93% after 480 min at the room temperature,RH (relative humidity)=80%and WHSV (weight hourly space velocity)=600 L/(g·hr).The morphology,composition and structure of catalysts were investigated with X-ray diffractometer (XRD),Raman spectra,N_(2) physisorption,field emission scanning electron microscope (FESEM),X-ray photoelectron spectroscopy (XPS),H2temperature-programmed reduction (H_(2)-TPR),O_(2) temperature-programmed desorption (O_(2)-TPD) and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS).It was confirmed that high catalytic activity of amorphous MnOxfor ozone removal was mainly ascribed to its abundant oxygen vacancies,high oxygen mobility and large specific surface area.

关键词： Amorphous manganese oxides Hydrothermal method Ozone Catalytic decomposition Oxygen vacancies

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Study on the Relation Bet ween Magnetic Moment and Charge Transfer of Metallic Glasses By LCAO-X_(α) Method

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Chinese Physics Letters 1996年第3期13卷 196-198页

作者： LIU Hong-lin CHEN Nian-yi NI Min HE Li-ming JIN Qian-yuan Shanghai Institute of metallurgy Chinese Academy of SciencesShanghai 200050 Department of Physics East China University of Science and TechnologyShanghai 200237

The calculations of the clusters,T_(27) and T_(27)B_(7)(T=Fe,Co and Ni),modelling metallic glasses have been performed using the quantum chemical linear combination of atomic orbitals(LCAO)-X_(α) *** argument about t... 详细信息

关键词： (α) glasses clarified

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Reaction mechanisms between molten CaF2-based slags and molten 9CrMoCoB steel

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International Journal of Minerals,metallurgy and Materials 2020年第5期27卷 611-619页

作者： Lei-zhen Peng Zhou-hua Jiang Xin Geng School of metallurgy Northeastern UniversityShenyang 110819China

Investigating the reaction mechanism between slag and 9CrMoCoB steel is important to develop the proper slag and produce qualified ingots in the electroslag remelting(ESR) process. Equilibrium reaction experiments between molten 9CrMoCoB steel and the slags of 55 wt%CaF2–20 wt%CaO–3 wt%MgO–22 wt%Al2O3–xwt%B2O3(x = 0.0, 0.5, 1.0, 1.5, 2.0, 3.0) were conducted. The reaction mechanisms between molten 9 CrMoCoB steel and the slags with different B2O3 contents were deduced based on the composition of the steel and slag samples at different reaction times. Results show that B content in the steel can be controlled within the target range when the B2O3 content is 0.5 wt% and the FeO content ranges from 0.18 wt% to 0.22 wt% in the slag. When the B2O3 content is ≥1 wt%, the reaction between Si and B2O3 leads to the increase of the B content of steel. The additions of SiO2 and B2O3 to the slag should accord to the mass ratio of [B]/[Si] in the electrode, and SiO2 addition inhibits the reaction between Si and Al2O3.

关键词： 9CrMoCoB electroslag remelting B2O3 thermodynamic calculation reaction mechanism

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Influence of crucible material on inclusions in 95Cr saw-wire steel deoxidized by Si–Mn

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International Journal of Minerals,metallurgy and Materials 2020年第8期27卷 1083-1099页

作者： Yang Li Chang-yong Chen Guo-qing Qin Zhou-hua Jiang Meng Sun Kui Chen School of metallurgy Northeasten UniversityShenyang 110819China

To investigate the interaction mechanism between 95 Cr saw-wire steel and different refractories,we conducted laboratory experiments at 1873 *** crucible materials(SiO2,Al2 O3,MgO·Al2 O3,MgO,and MgO-CaO)were *** results indicate that SiO2,Al2 O3,and MgO·Al2 O3 are not suitable for smelting low-oxygen,low-[Al]s 95 Cr saw-wire steel,mainly because they react with the elements in the molten steel and pollute the steel *** contrast,MgO-CaO is an ideal choice to produce 95 Cr saw-wire *** offers three advantages:(ⅰ)It does not decompose by itself at the steelmaking temperature of 1873 K because it exhibits good thermal stability;(ⅱ)[C],[Si],and[Mn]in molten steel cannot react with it to increase the[O]content;and(ⅲ)it not only desulfurizes and dephosphorizes but also removes Al2 O3 inclusions from the steel *** a result,the contents of the main elements([C],[Si],[Mn],[Cr],N,T.O(total oxygen))in the steel are not affected and the content of impurity elements([Al]s,P,and S)can be perfectly controlled within the target ***,the number and size of inclusions in the steel samples decrease sharply when the MgO-CaO crucible is used.

关键词： nonmetallic inclusions 95Cr saw-wire steel crucible material MgO–CaO refractory

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Decomposition Reaction of Mixed Rare Earth Concentrate and Roasted with CaO and NaCl

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Journal of Rare Earths 2004年第Z1期22卷 53-56页

作者： Wu Wenyuan Hu Guangyong Sun Shuchen Chen Xudong Tu Ganfeng School of Material and metallurgy Northeastern University Shenyang 110004 China School of Material and Metallurgy Northeastern University Shenyang 110004 China School of Material and Metallurgy Northeastern University Shenyang 110004 China School of Material and Metallurgy Northeastern University Shenyang 110004 China School of Material and Metallurgy Northeastern University Shenyang 110004 China

The reaction of the mixed rare earth concentrate including monazite ( REPO4 ) and bastnaesite ( REFCO3 )decomposed by CaO and NaCl additives at the temperature range from 100 to 1000 ℃ was studied by means of XRD and *** results show that when CaO and NaCl are not added, only REFCO3 can be decomposed at the temperature of 377 ～ 450 ℃.The decomposition products include REOF, RE2O3 and ***, REFCO3 can not be *** CaO is added, the decomposition reactions occur at the temperature range from 660 to 750 ℃.CaO has three decomposition functions: ( 1 ) REPO4 can be decomposed by CaO and the decomposition products include RE2O3 and Ca3 (PO4)2; (2) CaO can decompose REOF, and the decomposition products are RE2O3 and CaF2; (3)CaO can decompose REPO4 with CaF2, and the decomposition products are RE2 O3, Ca5 F( PO4 )*** decomposition ratio of the mixed rare earth concentrate increased obviously, when CaO and NaC1 were ***1 can supply the liquid for the reaction, improve the mass transfer process and accelerate the *** the same time, NaC1 participated in the reaction that REPO4 was decomposed by CaO.

关键词： metallurgy technology rare earth concentrate decomposition reaction calcium oxide sodium chloride

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