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Effect of Al_(2)O_(3) content on the viscosity and structure of CaO-SiO_(2)-Cr_(2)O_(3)-Al_(2)O_(3) slags

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International Journal of Minerals,Metallurgy and Materials 2022年第8期29卷 1522-1531页

作者： Fang Yuan zheng zhao Yanling zhang tuo Wu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The effect of Al_(2)O_(3) content on the viscosity and structure of CaO-SiO_(2)-Cr_(2)O_(3)Al_(2)O_(3) slags was investigated to facilitate recycling of Cr in steelmaking *** slags exhibit good Newtonian behavior at high *** viscosity of acidic slag first increases from 0.825 to 1.141 Pa·s as the Al_(2)O_(3) content increases from 0 to 10wt%and then decreases to 1.071 Pa·s as the Al_(2)O_(3) content increases further to 15wt%.The viscosity of basic slag first increases from 0.084 to 0.158 Pa·s as the Al_(2)O_(3) content increases from 0 to 15wt%and then decreases to 0.135 Pa·s as the Al_(2)O_(3) content increases further to 20wt%.Furthermore,Cr_(2)O_(3)containing slag requires less Al_(2)O_(3) to reach the maximum viscosity than Cr_(2)O_(3)free slag;the Al_(2)O_(3) contents at which the behavior changes are 10wt%and 15wt%for acidic and basic slags,*** ac-tivation energy of the slags is consistent with the viscosity *** spectra demonstrate that[AlO_(4)]tetrahedra appear initially and were replaced by[AlO_(6)]octahedra with further addition of Al_(2)O_(3).The dissolved organic phosphorus content of the slag first increases and then de-creases with increasing Al_(2)O_(3) content,which is consistent with the viscosity and Raman results.

关键词： viscosity structure Cr-containing slag Raman spectra

Influence of Cr_(2)_(3)content on viscosity and rheological behavior of Cr_(2)O_(3)-containing slags

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Journal of Iron and Steel Research International 2022年第4期29卷 601-611页

作者： Fang Yuan zheng zhao Yan-ling zhang tuo Wu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The rheological behavior of Cr_(2)_(3)-containing slags was investigated using a rotating cylinder viscometer and the solid fraction and phases of Cr_(2)_(3)in molten slags were also calculated and observed at different ***,the viscosities of CaO–SiO2–Cr_(2)_(3)(–10%Al2O3)slags were measured from 1703 to 1953 K and the influence of Cr_(2)_(3)content on the viscosity and rheological behavior of molten slags was *** calculation revealed that the solid fraction of the molten slags varied with the Cr_(2)_(3)content and maximum temperature,and the fluid properties transitioned from Newtonian to non-Newtonian behavior when the solid fraction reached 5%.Moreover,the increase in Cr_(2)_(3)content led to an increase in the viscosity as the slags displayed Newtonian flow characteristics and a decrease in the viscosity when slags exhibited non-Newtonian flow *** viscosity results of Cr_(2)_(3)-containing slag from 1703 to 1953 K and from 1703 to 1813 K were also discussed with the morphologies.

关键词： Viscosity Rheology behavior Cr_(2)_(3)-containing slag Morphology

Effect of operational and geometric parameters on the hydrodynamics of a Wurster coater:A CFD-DEM study

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Particuology 2024年第2期85卷 62-76页

作者： Yinqiang Song tuo zh.u Ruiqi Bai Man zhang Hairui Yang Department of Energy and Power Engineering Tsinghua UniversityBeijing100084China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Tsinghua UniversityBeijing100084China State Key Laboratory of Power System and Generation Equipment Tsinghua UniversityBeijing100084China

A coupled CFD-DEM method was used to study the hydrodynamics of a Wurster ***,the CFD part of the model was validated by the accurate prediction of the pressure drops over a pseudo-2D fluidized bed under various gas *** effect of gas velocity,gap height,tube length and batch volume of the particles on the cycle time and the residence time of the particles was thoroughly *** central jet gas velocity ui was found to speed up the particle cycle but undermine the coating *** gas velocity at the horizontal transport zone u2 was able to promote the horizontal transport of the particles but should not be too high,otherwise,it would obstruct the normal falling back of the particles in the downward *** gap heights would decrease the coating efficiency but tube length had little impact on *** increment of batch volume would commonly abase the cycle time and the working efficiency under a given *** de-fluidization problem arose when the batch volume increased to 550 ***,this problem could be swept out by the optimization of u1 and *** a mixture of different sizes,the coarse particles enjoyed higher coating efficiency and could travel closer to the *** may shield the fine particles from getting enough coating liquids,and thus coarse particles and fine particles were not recommended to get coated in the same batch.

关键词： Numerical simulation CFD-DEM Wurster coater Hydrodynamics Cycle time Residence time

Dual-polarized and real-time reconfigurable metasurface absorber with infrared-coded remote-control system

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Nano Research 2022年第8期15卷 7498-7505页

作者： Jiangyong Liu Yuping Duan tuo zhang Lingxi Huang Huifang Pang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116085China

The reconfigurable metasurfaces which can regulate the microwave absorption performance at the sub wavelength scale provide a possibility to construct intelligent stealth ***,the existing reconfigurable-metasurface-based absorbers seriously limit the medium and long-distance regulation in practical application due to the complex circuit path and regulation ***,an infrared-coded dual-polarized metasurface absorber(IDMA)with remote-control mode was proposed,which realized the realtime dynamic regulation of the intensity and frequency range of absorption peaks by combining the infrared-coding remotecontrol technology with the active metasurface *** proposed remote-control system can switch the 8-bit binary coding sequences stored in the microcontroller unit(MCu)by an infrared transceiver,so as to regulate the state of active devices under X-and Y-polarizations,*** experimental results showed that the reflection/absorption responses can be regulated by switching different binary codes,and the reflection loss(RL)can be tuned below−7.5 dB(absorptivity over 82%)in wide range of 6.20–18 ***,the corresponding equivalent circuit model was established and the distributions of surface current and electric field were analyzed to elucidate the dynamic reconfigurable mechanism of the metasurface *** proposed IDMA,which combines intelligent electronic technology with active metasurface absorber,creatively realizes the remote control of active metasurface absorber and opens up a new way for the stealth technology of smart absorber in the future.

关键词： microwave absorption active metasurface reflection/absorption infrared-coded remote-control real-time dynamic control

Thermogravimetric characteristics of corn straw and bituminous coal copyrolysis based the ilmenite oxygen carriers

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Chinese Journal of Chemical Engineering 2024年第4期68卷 8-15页

作者： Pengxing Yuan Xiude Hu Jingjing Ma tuo Guo Qingjie Guo College of Chemical Engineering Qingdao University of Science&TechnologyQingdao 266042China State Key Laboratory of High-efficiency utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021China

Herein,the co-pyrolysis reaction characteristics of corn straw(CS)and bituminous coal in the presence of ilmenite oxygen carriers(OCs)are investigated via thermogravimetry coupled with mass *** results reveal that the participation of OCs weakens the devolatilization intensity of *** the CS blending ratio isuel exhibits positive synergistic *** fitting results according to the Coats-Redfern integral method show that the solid-solid interaction between OCs and coke changes the reaction kinetics,enhancing the co-pyrolysis reactivity at the high-temperature zone(750-950C).The synergistic effect is most prominent at a 30%CS blending ratio,with copyrolysis activation energy in the range of 26.35-40.57 kJ·mol^(-1).

关键词： Oxygen carrier Co-pyrolysis Biomass Coal

龙卷风作用核电常规岛主厂房随机响应及结构体系可靠度

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建筑结构学报 2014年第5期35卷 128-134页

作者：宋拓吕令毅东南大学土木工程学院江苏南京210096

在基于实际龙卷风观测记录的基础上,推导了极值Ⅲ型龙卷风强度概率分布函数并建立了龙卷风随机荷载模型。以核电常规岛主厂房钢框架结构为计算模型,采用谱随机有限元法,在厂房位于龙卷风中心、厂房位于龙卷风上游最大风速半径处及厂房... 详细信息

在基于实际龙卷风观测记录的基础上,推导了极值Ⅲ型龙卷风强度概率分布函数并建立了龙卷风随机荷载模型。以核电常规岛主厂房钢框架结构为计算模型,采用谱随机有限元法,在厂房位于龙卷风中心、厂房位于龙卷风上游最大风速半径处及厂房位于龙卷风下游最大风速半径处三种工况,考虑龙卷风荷载和结构抗力参数的不确定性,对结构进行随机响应和可靠度分析。分析结果表明:厂房位于龙卷风中心时,龙卷风荷载对厂房产生明显的扭转效应,结构顶点位移对规范限值的超越概率为三种工况中最大;当厂房位于龙卷风最大风速半径处,龙卷风对结构主要产生指向龙卷风中心的侧向推动作用,顶点位移的超越概率较小;龙卷风位于厂房中心处为三种工况中的荷载最不利位置。针对不同的位移限值,绘制了结构在龙卷风荷载最不利工况下的易损性曲线。

关键词：核电厂龙卷风概率模型极值Ⅲ型分布谱随机有限元法可靠度

Petrogenesis and Geodynamic Implications of Late Jurassic Diorite Porphyry in the Neoproterozoic Ophiolitic Mélange of NE Jiangxi (South China)

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Acta Geologica Sinica(English Edition) 2018年第3期92卷 1008-1023页

作者： WANG Xinshui GAO Jun LI Jilei JIANG tuo XuE Shengchao Key Laboratory of Mineral Resources Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Institutions of Earth Science Chinese Academy of Sciences Beijing 100029 China College of Earth Science University of Chinese Academy of Sciences Beijing 100049 China College of Earth Science and Engineering Shandong University of Science and Technology Qingdao266590 China Laboratory of Isotope Geochemistry Wuhan Centre of China Geological Survey Wuhan 430205 China State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 China

Mesozoic magmatism is widespread in the eastern South China Block and has a close genetic relationship with intensive polymetallic mineralization. However, proper tectonic driver remains elusive to reconcile the broad intracontinental magmatic province. This study presents integrated zircon u-Pb dating, Hf isotopes and whole-rock geochemistry of the Xiwan dioritic porphyry in the NE Jiangxi ophiolitic mélange. Zircon u-Pb dating by SIMS and LA-ICP-MS methods yielded an emplacement age of ～160 Ma for the Xiwan diorite, confirming its inclusion into the Mesozoic magmatic province in SE China, instead of a component of the Neoproterozoic ophiolitic mélange genetically. The dioritic rocks have low Si02(58.08 wt%-59.15 wt%), and high NaO(5.00 wt%-5.21 wt%) and MgO(4.60 wt%-5.24 wt%) contents with low TFeO/MgO ratios(1.02-1.09). They show an adakitic geochemical affinity but exhibit relatively low Sr/Y ratios(24.8-31.1) and high Y contents(14.6-18.3 ppm) compared to the Dexing adakitic porphyries. In addition, the Xiwan diorites have moderately evolved zircon Hf isotopic compositions(ε(t)=-6.1--0.1; T=1597-1219 Ma). These elemental and isotopic signatures suggest that the Xiwan diorite formed through partial melting of a remnant arc lower crust(i.e., early Neoproterozoic mafic arc-related rocks) in response to the underplating of coeval mafic magmas. In conjunction with the temporal-spatial distribution and complex geochemical characteristics of the Mesozoic magmatism, our case study attests to the feasibility of a flat-slab subduction model in developing the broad intracontinental magmatic province in SE China. The flat-slab delamination tends to trigger an asthenospheric upwelling and thus results in extensive partial melting of the overlying lithospheric mantle and lower crustal materials in an extensional setting during the Mesozoic.

关键词： adakite flat-slab subduction Mesozoic NE Jiangxi South China Block

Zircon Ages of Metasedimentary Rocks in the Wuwamen Ophiolitic Mélange,Chinese South Tianshan:Implications for the Paleozoic Subduction-Accretion in the Southern Central Asian Orogenic Belt

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Journal of Earth Science 2022年第5期33卷 1059-1071页

作者： Xin-Shui Wang Fei Yang Reiner Klemd tuo Jiang Jun Gao School of Earth Sciences China University of GeosciencesWuhan 430074China Guangzh.u urban Planning&Design Survey Research Institute Guangzhou 510060China GeoZentrum Nordbayern Friedrich-Alexander-Universität Erlangen-NürnbergSchlossgarten 5aErlangen91054Germany Laboratory of Isotope Geochemistry Wuhan Centre of China Geological SurveyWuhan 430205China Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China

High-temperature and high-pressure(high-grade)metamorphic complexes of variable ages are common in the Central Asian orogenic belt(CAOB),and their precise geochronology and origin are essential to unravel the orogenic architecture and crust-production rate of the *** it is essential to differentiate between pre-orogenic Precambrian basement and Paleozoic arc-accretionary *** study provides precise in situ zircon u-Pb ages for the metasedimentary rocks in the Wuwamen ophiolitic mélange,which is traditionally thought to represent the pre-orogenic basement of the southwestern CAOB.A meta-sandstone from the meta-flysch sequence revealed a widespread ca.1.8 Ga high-grade metamorphic overprint similar to that of the underlying orthogneisses and,thus,was interpreted to represent pre-orogenic basement fragments that occur as tectonic blocks in the Paleozoic ophiolitic mé*** contrast,a schist from the mélange matrix is characterized by a ca.333 Ma high-grade metamorphic overprint,indicating that the northward subduction of the South Tianshan Ocean was still active at this *** thrust-imbricated high-grade metamorphic rocks of contrasting origins in an accretionary complex have important implications for the understanding the accretionary history and crustal growth of the ***,the strongly deformed ophiolitic mélange was intruded by an undeformed granite dyke with an emplacement age younger than ca.294 Ma,thus providing a minimum age limit for the final closure of the South Tianshan Ocean.

关键词： high-temperature/high-pressure metamorphism Zircon u−Pb ophiolitic mélange subduction Tianshan CAOB geochemistry

unveiling mechanical response and deformation mechanism of extruded WE43 magnesium alloy under high-speed impact

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Journal of Rare Earths 2024年第12期42卷 2303-2315,I0004页

作者： Pengcheng Guo tuo Ye Yuanzhi Wu Shawei Qiu Erli Xia Xianlan Liu Luoxing Li College of Intelligent Manufacturing and Mechanical Engineering Hunan Institute of TechnologyHengyang421002China Research Institute of Hunan university in Chongqing Hunan UniversityChongqing400044China

To clarify the mechanical behavior and deformation mechanism of rare earth magnesium(Mg)alloy WE43 under extreme service loads,high-speed impact tests under various deformation temperatures and loading paths were conducted using a split Hopkinson pressure *** flow stress along extrusion direction(ED)and extrusion radial direction(ERD)decreases apparently with deformation *** with conventional Mg alloys,it exhibits a slight anisotropy and an unusual C-shaped *** dislocation,mechanical twin and fine grain that occur after high-speed impact deformation are insensitive to the loading direction,but strongly dependent on the deformation temperature,especially superimposed with adiabatic temperature *** a result,dynamic recrystallization(DRX)occurs even at an ambient temperature of 25℃.Double twinning and prismatic slip or pyramidal slip are the dominant deformation mechanisms at 25℃.These twins induce mechanical cutting refinement to form some fine-grained structures,accompanied by a small number of fine grains by twinning induced *** contrast,the deformation at 250℃is mainly controlled by prismatic slip and pyramidal slip,accompanied by various types of twinning in early deformation *** with 25℃,more fine-grained microstructures are formed at 150 and 250℃through a synergy mechanism of twinning induced mechanical cutting and twinning induced DRX.

关键词： WE43 Mg alloy High-speed impact Deformation mechanism Twinning Dynamic recrystallization Rare earths