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Directional amine-based solvent extraction for simultaneous enhanced water recovery,salt separation and effective descaling from hypersaline brines

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Frontiers of Environmental Science & Engineering 2024年第3期18卷 83-92页

作者： Yuyao Zhang Litao Jia Jin Zhao Xuming Liu Shuyu Dong Chuanyang Liu Yuanyuan Cui shougang res.arch inst.tute of Technology Beijing 100043China res.arch Center of Environmental Technology in Water Pollution Source Identification and Precise Supervision School of EnvironmentTsinghua UniversityBeijing 100084China

The feasibility of simultaneous water recovery,salt separation and effective descaling of hypersaline brine was investigated by diisopropylamine(DIPA)-based directional solvent extraction(DSE),using diluted/concentrated seawater with initial saline concentration range of 12–237 g/L at extraction temperatures.of 5 and 15℃,*** water recovery shows an obvious boundary at saline concentration of 115 g/L under dual effect of specific water extraction efficiency and extraction *** Cl^(–) ion concentration in product water is in sharp contrast to the nearly complete removal of SO_(4)^(2–)and hardness ions,indicating that DIPA-based DSE process indeed achieved efficient separation and purification of Cl^(–) ion from hypersaline ***,the radical precipitation of Mg^(2+)and Ca^(2+)ions in form of Mg(OH)_(2)and CaCO_(3)demonstrates effective descaling potential,although it leads to more DIPA res.dues in dewatered raffinate than product ***,an exponential correlation between the Cl^(–) removal efficiency and specific water extraction efficiency further reveals the intrinsic relationship of water extraction process and transfer of Cl^(–) ion to the product ***,the study provides a novel approach for integrating the water recovery and separation of Cl^(–) ion from ultra-high-salinity brines with radical precipitation of Mg^(2+)and Ca^(2+) ions in one step.

关键词： Hypersaline brines Directional solvent extraction Salt separation Ca^(2+)and Mg^(2+)descaling

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Al_(80)Ni_6Y_8Co_4Cu_2 GLASS ALLOYS CONTAINING NANOSCALEPARTICLES BY ISOTHERMAL ANNEALING OR QUENCHING

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Acta metall.rgica Sinica(English Letters) 2000年第5期13卷 1039-1046页

作者： Z. Bian, G. He and G.L. Chen (State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China) J. Lu, D.J. Chen, G.C. Tu, G.J. Chen and X.J. Hu (shougang metall.rgical res.arch inst.tute, Beijing Lab. for Adv. Metals and Mat. Univ. of Sci. and Technol. Beijing Beijing 100083 China shougang metall. res. inst. Beijing 100085 China

Al80Ni6 Y8 Co4 Cu2 amorphous ribbons were isothermally annealed and a mixed structure consisting of α-Al particle with a size of less than 15nm and Al3Ni compound with a size of about 30nm was obtained. The crystallization kinetics of Al80Ni6 Y8 Co4 Cu2 amorphous alloy shows that the precipitation of α-Al particles is the growth process controlled by diffusion of the solute elements rejected from the growing crystals. By quenching at different cooling rates, a mixed structure consisting of nanoscale α-Al particles and the remaining glass matrix or structure consisting of nanoscale particle (Al phase or Al3Ni compound) with a size of about 100nm was formed. The addition of Co elements and Cu elements to Al-Ni-Y alloy systems increases the glass formation ability of the alloy and the thermal stability of the supercooled liquid region against.crystallization, which res.lts from significant difference of atomic size, strong bonding nature among constituent elements and the low diffisivity of the solute elements due to the concentration gradient in the growing front of crystals.

关键词： a mixed structure nanoscale particle isothermal annealing cooling rate concentration gradient α-Al particle Al3Ni compound

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Coke behavior with H_(2)O in a hydrogen-enriched blast furnace:A review

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International Journal of Minerals,metall.rgy and Materials 2024年第5期31卷 959-976页

作者： Feng Zhou Daosheng Peng Kejiang Li Alberto N.Conejo Haotian Liao Zixin Xiong Dongtao Li Jianliang Zhang School of metall.rgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Chemical Engineering The University of QueenslandSt LuciaQLD 4072Australia Baosteel Central res.arch inst.tute(R&D Center of Wuhan Iron&Steel Co. Ltd.)Wuhan 430080China shougang res.arch inst.tute of Technology Shougang Group Corporation Ltd.Beijing 100043China Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology Beijing 100043China

Hydrogen-enriched blast furnace ironmaking has become an essential route to reduce CO_(2)emissions in the ironmaking ***,hydrogen-enriched reduction produces large amounts of H_(2)O,which places new demands on coke quality in a blast *** a hydrogen-rich blast furnace,the pres.nce of H_(2)O promotes the solution loss *** res.lt improves the reactivity of coke,which is 20%-30%higher in a pure H_(2)O atmosphere than in a pure CO_(2)*** activation energy range is 110-300 kJ/mol between coke and CO_(2)and 80-170 kJ/mol between coke and H_(2)***_(2)and H_(2)O are shown to have different effects on coke degradation *** review provides a comprehensive overview of the effect of H_(2)O on the structure and properties of *** exploring the interactions between H_(2)O and coke,several unres.lved issues in the field requiring further res.arch were *** review aims to provide valuable insights into coke behavior in hydrogen-rich environments and promote the further development of hydrogen-rich blast furnace ironmaking processes.

关键词： hydrogen ironmaking coke behavior blast furnace gasification microstructure kinetics

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Core competencies and perceived training needs of nurses in the background of Internet plus nursing service:a qualitative descriptive study

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Frontiers of Nursing 2024年第2期11卷 181-190页

作者： Qiang-Hui-Zi Zhang Wei-Wei Liu Zhen-Zhen Cheng School of Nursing Capital Medical UniversityBeijing 100069China Department of Orthopedics Peking University Shougang HospitalBeijing 100043China

Background:The Internet plus nursing service program is being piloted in China,which has become a new home nursing service model led by *** enable safe and effective homecare service delivery,nurses working in the program need a high level of ***,the content of these core competencies and the training needs of nurses for Internet plus nursing services are still ***:To describe nurses’perceptions of core competencies and training needs to work in the Internet plus nursing service program,thereby providing a reference for the development of training ***:A qualitative descriptive study using semi-structured interviews was conducted on 15 nurses with experience of working in the Internet plus nursing service *** were audio-recorded and transcribed verbatim,and the data were analyzed using thematic ***:Core competencies involved comprehensive assessment competence,direct care practice competence,health education and consulting competence,risk estimation and res.onse competence,and communication *** needs involved complex operational items,knowledge of chronic disease management,professional communication,risk identification and res.onse,nursing standards,norms,and procedures.and utilization of information ***:The training system may be developed based on nurses’core competencies and their training needs to promote professional development of the Internet plus nursing service.

关键词： core competence Internet plus nursing service nursing qualitative study training needs

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Corrosion Behavior and Protection Efficiency of 2024Al and SiC_p/2024Al Metal Matrix Composite

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Journal of Materials Science & Technology 2002年第4期18卷 351-353页

作者： Chunlin HE, Changsheng LIU, Fengqin LI and Qingkui CAISchool of Materials and metall.rgy, Northeastern University, Shenyang 110004, ChinaZhiming SHI, Liqing CHEN and Jing BIinst.tute of Metal res.arch, Chinese Academy of Sciences, Shenyang 110016, China Sch. of Mat. and metall. Northeastern Univ. Shenyang 110004 China inst. of Metal res. Chinese Acad. of Sci. Shenyang 110016 China

The corrosion res.stance of 2024 Al and SiC particle reinforced 2024 Al metal matrix composite (SiCp?024AI MMC) in 3.5% NaCl solution was investigated with electrochemical method and immersion test, and the corrosion protection of sulfuric acid anodized coatings on both materials was evaluated by electrochemical impedance spectroscopy. The res.lts showed that the SiCp?024AI MMC is more susceptible to corrosion than its matrix alloy in 3.5% NaCI. For 2024AI, the anodized coating provides excellent corrosion res.stance to 3.5% NaCI. The anodized coating on the SiCp?024AI provides satisfactory corrosion protection, but it is not as effective as that for 2024AI because the structure of the anodized layer is affected by the SiC particulates.

关键词： 2024 Al Metal matrix composite Anodizing Electrochemical impedance spcctroscopy Potentiodynamic polarization Corrosion res.stance

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Effect of Addition of Al on Crystal Structure Microtexture and Magnetostriction Coefficient in Tb0.3 Dy0.7 Fe1.95 Alloy

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Journal of Rare Earths 2004年第z1期22卷 84-86页

作者： Jiang Liping Sch. of Mat. and metall. Northeast Univ. Shenyang 110004 China Baotou res. inst. of Rare Earth Baotou 014010 China

The effect of addition of Al on crystal structure microtexture and magnetostriction coefficient in Tb0.3Dy0.7Fe1.95 alloy were studied. The res.lts show that addition of Al does not change crystal structure of alloy and the precipitates increase in the microtexture as addition of Al increases. At a certain magnetic field, magnetostriction coefficient changed with addition of Al. when magnetic field was smaller than 40 kA·m-1, there was a peak in magnetostriction coefficient as addition of Al increased. When magnetic fields was higher than 40 kA·m-1, magnetostriction coefficient decreased as addition of Al increased.

关键词： Magnetostriction Microtexture Rare earths Tb-Dy-Fe alloy

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Discussion on Gas Safety Protection Management in Steel Plants

Frontiers of Metallurgical Industry

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Frontiers of metall.rgical Industry 2024年第1期2卷 34-36页

作者： Han Lu Jingyu Huang shougang Jingtang Steel United Co. Ltd.

The necessity of establishing gas protection station in iron and steel works is demonstrated,issues of strengthening the management of gas safety protection,studying new technology of gas protection,adapting to the needs of modernization and building large scale and intelligent iron and steel works are *** sug-gestions are also put forward.

关键词： iron and steel works gases safety protection

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Effects of Magnetic Heat Treatment on Magnetostiction Properties of Tb0.3 Dy0.7 Fe1.95 Alloy

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Journal of Rare Earths 2004年第z1期22卷 87-89页

作者： Jiang Liping Sch. of Mat. and metall. Northeast Univ. Shenyang 110004 China Baotou res. inst. of Rare Earths Baotou 014010 China

The effects of magnetic heat treatment on magnetostriction properties of Tb0.3Dy0.7Fe1.95 alloy were investigated. The directionally solidified alloy was heated to various temperatures.near Curie temperature TC in vacuum, kept for a certain time under the application of magnetic field and then cooled to room temperature. The magnetostriction coefficient was measured by a res.stance strain gage. The crystal structure was analyzed by X-ray diffraction (XRD). The experimental res.lts show that the magnetostriction coefficient obviously increases and the grains orientations along the axis changed somewhat as the field of 1 T vertical to axis of the rod-shaped specimen is applied for 5 min at the heating temperature slightly lower than TC.

关键词： Magnetic heat treatment Magnetic material Magnetostriction Rare earths Tb-Dy-Fe alloy

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Interfacial Electronic Structure of Thin Cu Films Grown on Ar^+-ion Sputter-cleaned α-Al_2O_3 Substrates

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Journal of Materials Science & Technology 2002年第2期18卷 117-120页

作者： Christina Scheu, Min Gao and Manfred RuhleMax-Planck-inst.tut fur metall.orschung, Seestr. 92, 70174 Stuttgart, Germany [ Manuscript received October 17, 2001] Max-Planck-inst. für metall. Seestr. 92 70174 Stuttgart Germany

The bonding and electronic structure of Cu/(0001)Al2O3 and Cu/(1120)Al2O3 interfaces has been studied experimentally using spatially-res.lved transmission electron energy loss spectroscopy. The specimen were prepared by depositing Cu on single-crystal α-AI2O3 substrates, which have been Ar+-ion sputter-cleaned prior to the growth of Cu. For both orientations of the α-Al2O3 substrate, atomically abrupt interfaces formed as determined by high-res.lution transmission electron microscopy. The investigations of the interfacial Cu-L2,3, Al-L2,3 and 0-K energy loss near-edge structures. which are proportional to the site- and angular-momentum-projected unoccupied density of states above the Fermi level, indicate the existence of metall.c Cu-AI bonds at the Cu/AI2O3 interface independent of the substrate orientation.

关键词： Electronic structure Cu film Ion sputtering α-Al2O3

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Lattice Distortion Analysis Directly from High res.lution Transmission Electron Microscopy Images —the LADIA Program Package

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Journal of Materials Science & Technology 2002年第2期18卷 135-138页

作者： Y.Rau, N.Y.Jin-Phillipp and F.PhillippMax-Planck-inst.tut fiir metall.orschung, Heisenbergstrasse 1, Stuttgart, D-70569, Germany [ Manuscript received November 22, 2001] Max-Planck-inst. für metall. Heisenbergstrasse 1 D-70569 Stuttgart Germany

Direct strain mapping from high res.lution transmission electron microscopy images is possible for coherent structures. At proper imaging conditions the intensity peaks in the image have a constant spatial relationship with the projected atom columns. This allows the determination of the geometry of the projected unit cell without comparison with image simulations. The fast procedure is particularly suited for the analysis of large areas. The software package LADIA is written in the PV-WAVE code and provides all necessary tools for image processing and analysis. Image intensity peaks are determined by a cross-correlation technique, which avoids problems from noise in the low spatial frequency range. The lower limit of strain that can be detected at a sampling rate of 44 pixels/nm is≈2%.

关键词： High-res.lution transmission electron microscopy Distortion analysis

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