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Dense copper azide synthesized by in-situ reaction of assembled nanoporous copper microspheres and its initiation performance

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Defence Technology（防务技术） 2022年第6期18卷 1065-1072页

作者： Xing-yu Wu Ming-yu Li qing-xuan Zeng qing-xia yu State Key Laboratory of Explosion and Technology Beijing Institute of TechnologyBeijing100081PR China

Copper azide with high density was successfully synthesized by in-situ reaction of nanoporous copper(NPC)precursor with HN_(3) *** with pore size of about 529 nm has been prepared by electroless plating using polystyrene(PS)as *** copper shells thickness of NPC was controlled by adjusting the PS loading *** effects of copper shell on the morphology,structure and density of copper azide were *** conversion increased from 87.12%to 95.31%when copper shell thickness decrease from 100 to 50 ***,the density of copper azide prepared by 529 nm NPC for 24 h was up to 2.38 g/cm^(3).The hollow structure of this NPC was filled by swelling of copper azide which guaranteed enough filling volume for keeping the same shape as well as improving the charge ***,HNS-IV explosive was successfully initiated by copper azide with minimum charge thickness of 0.55 mm,showing that copper azide prepared has excellent initiation performance,which has more advantages in the application of miniaturized explosive systems.

关键词： Nanoporous copper Electroless plating In-situ reaction Copper azide

Green building materials lit up by electromagnetic absorption function:A review

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Journal of Materials Science & Technology 2022年第17期112卷 329-344页

作者： Ting-Ting Liu Mao-qing Cao Yong-Sheng Fang yu-Hang zhu Mao-Sheng Cao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Heilongjiang Institute of Construction Technology Harbin 150025China

Healthy and livable living environments,as well as anti-electromagnetic(EM)radiation buildings,are the long-term goals of human *** introduction of advanced EM wave absorbing materials into buildings is one of the most feasible ways to address the increasing EM pollution in building ***-efficiency,broadband,low-cost and good building performance EM wave absorbing materials,as an important support in the field of sustainable building,has gradually become the hotspot ***,we review the research progress of building materials with EM wave absorption functions,and comb their classification,including cement,concrete,ceramics,and prefabs,especially highlighting the advanced coating *** objectively outline and evaluate the latest technology of building materials with EM wave absorption performance,and discuss the main problems and bottlenecks,highlighting potential research opportunities.

关键词： Anti-electromagnetic radiation building Electromagnetic wave absorption Building materials Green building

Difference of sintering performance of different types of limonitic nickel laterite

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Journal of Iron and Steel Research International 2023年第1期30卷 21-30页

作者： yu-xiao Xue Jian Pan De-qing zhu Xin Wang Bo-hua Li Wei Liu School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina

To achieve the more extensive utilization of limonitic nickel laterite,the difference of sintering performance of different types of limonitic nickel laterite including high-gangue and low-gangue nickel ores was investigated by sinter pot tests and relevant mechanism analyses such as thermodynamic analysis and the chemistry and mineralogy of product *** the type of limonitic nickel laterite transformed from high-gangue to low-gangue nickel ore,tumble index and productivity are improved from 45.87%and 0.97 t m^(-2) h^(-1) to 50.16%and 1.05 t m^(-2) h^(-1),respectively,and solid fuel rate is reduced from 140.52 to 131.13 kg/t,indicating that the low-gangue nickel ore possesses relatively better sintering *** is mainly due to the fact that the much lower contents of MgO and Al2O3 improve the formation ability and fluidity of liquid phase,which eventually contributes to the formation of relatively tighter sinter microstructure with the lower sinter porosity,more silico-ferrite of calcium and alumina amount and better bonding of hercynite by liquid *** addition,the metallurgical performance and nickel content of product sinter would not be reduced as different types of limonitic nickel laterite are blended for *** this basis,it is entirely feasible to more widely utilize limonitic nickel laterite and simultaneously obtain much better-quality Ni-containing product sinter via effective sintering strengthening technologies.

关键词： Limonitic nickel laterite Sintering Stainless steel High-melting component Extensive utilization

Nitrogen-,phosphorus-doped carbon-carbon nanotube CoP dodecahedra by controlling zinc content for high-performance electrocatalytic oxygen evolution

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Rare Metals 2020年第6期39卷 680-687页

作者： Xia-Xia Li Pei-Yao zhu qing Li yu-Xia Xu Yan Zhao Huan Pang School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China Guangling College Yangzhou UniversityYangzhou 225000China College of Chemistry and Materials Science Sichuan Normal UniversityChengdu 610068China

Here,N-and P-doped carbon-carbon nanotube CoP(NPC-CNTs-CoP)nanoparticles dodecahedra are achieved by multistep calcination of the Zn-doped zeolitic imidazolate framework ZIF-67 precursor(ZnCo-ZIF).In the structures,the presence of N and P atoms,abundant CNTs and the CoP nanoparticles can enhance electrochemical activity and promote the structural stability of *** the temperature increases,the Zn contents gradually reduce to zero,which provides more active sites for electrochemical ***,the high specific surface area and microporous behavior of NPC-CNTsCoP-9 make it excellent in electrocatalytic ***-CoP-9 shows a low overpotential of 224 mV at10 mA·cm^-2 in 1.0 mol·L^-1 KOH *** strategy of zeolitic imidazole framework-derived transition metal phosphides will provide a new sight for developing energy conversion materials.

关键词： Nitrogen Phosphorus Carbon Carbon nanotube CoP Oxygen evolution

A novel process for Fe recovery and Zn, Pb removal from a low-grade pyrite cinder with high Zn and Pb contents

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International Journal of Minerals,Metallurgy and Materials 2018年第9期25卷 981-989页

作者： Cong-cong Yang De-qing zhu Jian Pan Si-wei Li Hong-yu Tian School of Minerals Processing and Bioengineering Central South University

Comprehensive utilization of pyrite cinders is increasingly important because of their huge annual outputs and potential valuable metals recovery to cope with the gradual depletion of high-grade mineral resources. In this work, a new process, i.e., a high-temperature chlorination–magnetizing roasting–magnetic separation process, was proposed for recovering Fe and removing Zn, Pb from a low-grade pyrite cinder containing 49.90 wt% Fe, 1.23 wt% Zn, and 0.29 wt% Pb. Various parameters, including the chlorinating conditions(dosage of Ca Cl2, temperature, and time) and the magnetization roasting conditions(amount of coal, temperature, and time) were investigated. The results indicate that the proposed process is effective for Fe recovery and Zn, Pb removal from the pyrite cinder. Through this process, 97.06% Zn, 96.82% Pb, and approximately 90% S can be removed, and 89.74% Fe is recovered as magnetite into the final product under optimal conditions. A purified magnetite concentrate containing 63.07 wt% Fe, 0.16 wt% P, 0.26 wt% S, and trace amounts of nonferrous metals(0.005 wt% Cu, 0.013 wt% Pb, and 0.051 wt% Zn) was obtained. The concentrate can be potentially used as a high-quality feed material for producing oxidized pellets by blending with other high-grade iron ore concentrates.

关键词： pyrite cinder purification zinc lead high-temperature chlorination magnetizing roasting

A nickel/organoboron catalyzed metallaphotoredox platform for C(sp^(2))-P and C(sp^(2))-S bond construction

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Organic Chemistry Frontiers 2022年第4期9卷 1070-1076页

作者： yuan zhu Weisai Zu qing Tian Zifeng Cao yu Wei Liang Xu School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Shihezi UniversityShihezi832003China

Herein,an organoboron photocatalyst,aminoquinolate diarylboron(AQDAB),is utilized collaboratively with a nickel catalyst in metallaphotoredox catalyzed C(sp^(2))–P and C(sp^(2))–S cross-coupling *** strategy effectively couples aryl halides with diarylphosphine oxides and thiols at room temperature under an air atmosphere,affording the corresponding triarylphosphine oxides and thioethers in generally moderate to good yields.

关键词： boron nickel catalyzed

Theoretical Foundation of Carbonation Pellet Process for Ferrous Sludge Recycling

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Journal of Iron and Steel Research International 2011年第12期18卷 27-31页

作者： HU Chang-qing HAN Tao ZHANG yu-zhu ZHANG Zhi-xia College of Metallurgy and Energy Hebei United University Tangshan 063009 Hebei China Hebei Key Laboratory of Modern Metallurgy Technology Tangshan 063009 Hebei China

For the recycling of ferrous sludge from steel industry,the carbonation pellet process should be considered as a ＂green＂ process,since no impurities are added as well as CO2 can be sequestrated and *** the thermodynamic calculation,the carbonation reaction can occur spontaneously and is an exothermic *** on the kinetic analysis through unreacted core model,the interfacial chemical reaction was the rate controlling step in the initial fast stage of carbonation,and the CO2 diffusion through the CaCO3 product layer was the rate controlling step in the following extremely slow *** the carbonation bonded mechanism,the pellet strength was gained by the formation and growing of CaCO3 product *** the interfacial chemical reaction was the critical stage of the entire carbonation process,the emphasizes should be focused on the improvement of sorbent activity and the optimization of process parameters,such as pore structure,pore surface area,and total pressure,CO2 partial pressure,reaction temperature,etc to accelerate the reaction rate and to improve the quality of carbonation pellets.

关键词： CO2 sequestration ferrous sludge carbonation pellet thermodynamics kinetics unreacted core model

Adsorption and leaching of chalcopyrite by Sulfolobus metallicus YN24 cultured in the distinct energy sources

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International Journal of Minerals,Metallurgy and Materials 2015年第6期22卷 549-552页

作者： yu-ting Liang Shan zhu Jun Wang Chen-bing Ai Wen-qing Qin School of Minerals Processing and Bioengineering Central South University

The chalcopyrite-adsorption characteristics and leaching properties of Sulfolobus metallicus（S. metallicus） YN24 were investigated in this study. The effects of zeta potentials of S. metallicus samples on chalcopyrite cultivated with distinct sources of energy were similar. Regardless of the energy source cultivated, all of the investigated S. metallicus samples adhered rapidly to the chalcopyrite surface, with an adhesion plateau being reached within 60 min. However, the mineral-cultured S. metallicus adsorbed more strongly onto chalcopyrite than the sulfur-cultured S. metallicus did. Furthermore, chalcopyrite-leaching tests suggested that the copper-leaching ability of the mineral-cultured S. metallicus was also greater than that of unadapted S. metallicus. Therefore, the results provide insights into the mechanism of mineral-surface adsorption of microorganisms that helps enhance the copper-leaching rate.

关键词： chalcopyrite bioleaching Sulfolobus metallicus adsorption

Three-dimensional numerical analysis of the interaction of two crossing tunnels in soft clay

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Underground Space 2019年第4期4卷 310-327页

作者： Jin Yin-Fu zhu Bing-qing Yin Zhen-yu Zhang Dong-Mei Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina China Development Bank Sichuan Branch No.120Tiantai RoadGaoxin DistrictChengduSichuan ProvinceChina Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai 200092China Department of Geotechnical Engineering Tongji UniversityShanghai 200092China

Recently,with the development of underground construction,multi-tunnel engineering has become a matter of concern since the interaction between tunnels at close ranges could cause additional deformation in strata as well as surrounding structures and even serious damage to surface *** tunnel displacement and soil deformation problems can be effectively predicted using numerical methods considering the influence of various factors,such as the anisotropic nature of soft *** this end,the anisotropic elastoplastic constitutive S-CLAY1 is implemented in finite element code to investigate deformation problems in the strata and nearby structures caused by the excavation of *** paper focuses in particular on configurations of two crossing *** 3D numerical simulations using ABAQUS enable successive analyses conducted for tunnels at different spacings(1.5D,2.5D,3.5D and 4.5D,where D is the tunnel diameter)of configurations aligned *** results,including the ground settlement,lining force and moment,and tunnel convergence,are *** each aspect,the most unfavorable case is determined by comparing the results of different *** investigation can provide a reference for multi-tunnels design and construction.

关键词： Multi-tunnels Anisotropy Clay Ground loss Finite element Constitutive relation