检索结果-南通市图书馆

Transactions of Nonferrous Metals Society of China 2022年第5期32卷 1638-1649页

作者： Yuan-lin CHEN Xue-yi GUO Qin-meng WANG Qing-hua TIAN Jin-xiang ZHANG Shao-bo HUANG School of metallurgy and Environment Central South UniversityChangsha 410083China Ganzhou Nonferrous metallurgy research institute Ganzhou 341000China changsha research institute of mining and metallurgy co. LTDChangsha 410012China

Physico.hemical and mineralogical characteristics of an alkali leaching residue of wolframite were studied by XRD,SEM−EDS,chemical phase analysis,mineral liberation analyzer(MLA),and TG−DSC *** leaching tests,toxicity characteristic leaching procedure(TCLP)tests and Chinese standard leaching tests(CSLT)were co.ducted to determine the environmental mobility of toxic *** results show that,due to the high co.tents of W,Fe,Mn,Sn,and Nb,the residue is with high resource value,but the co.tent of a toxic element,As,is also *** existing minerals of the investigated elements mainly occur as monomer particles,but it is difficult to extract these valuable metals by co.ventional acid leaching due to their mineral *** release of As increases over time in acidic *** leaching co.centration of all investigated harmful elements through TCLP is within the limiting value,while the leaching co.centration of As through CSLT exceeds the limiting value by more than 4 times,so the residue is classified as hazardous solid waste based on the Chinese standard.A process for valuable metals reco.ery from this residue was *** experimental results indicated that the main valuable metals co.ld be extracted effectively.

关键词： alkali leaching residue physico.hemical characteristics environmental characteristics valuable metals reco.ery

Study on the Formation of Crystalline Rare Earth Carbonates from Rare Earth Ore Leaching Liquors

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 1993年第3期11卷 223-226页

作者：喻庆华李先柏 changsha research institute of mining and metallurgy Changsha 410012China

The crystalline precipitate of rare earth carbonates has been produced by the ammonium bicar- bonate precipitation method in the reco.ery of RE from the ammonium sulfate leaching liquor of the weath- ered leach-deposited rare earth *** influencing factors such as time,temperature and reagent co.- centration have been *** chemical analysis,XRD,SEM,IR spectrography,TGA and DTA have been used to analyze and examine the crystalline RE *** results were obtained.

关键词： Rare earth NH_4Hco.3 Rare earth carbonates Crystallization co.ditions

A NEW APPROXIMATE SOLUTION OF NONLINEAR DIFFUSION EQUATION

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 1985年第7期6卷 701-706页

作者：袁镒吾 Central-south institute of mining and metallurgy changsha

In this paper,the same problem in ref.[1] is *** author’s solutionapproximately satisfies the whole fundamental equations (1.1)and(1.2)and the wholebound values co.ditions (1.3-1.5).But the Liu’s solution does not s... 详细信息

关键词： In A NEW APPROXIMATE SOLUTION OF NONLINEAR DIFFUSION EQUATION exp

Synergistic effect and heterointerface engineering of co.alt/carbon nanotubes enhancing electromagnetic wave absorbing properties of silico. carbide fibers

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano research 2024年第9期17卷 8479-8486页

作者： Zixiang Zhao Zheyipei Ma Zizhao Ding Yanqiong Liu Mingwei Zhang Chao Jiang institute of Powder metallurgy research Central South UniversityChangsha 410083China

To improve the synergistic effect between dielectric and magnetic loss is a practical and effective way in optimizing electromagnetic wave absorbing *** co.posites of metal particles and carbon ligands derived from metal organic frameworks have gained wide *** this study,co.particles and multiwalled carbon nanotubes(CNT)were successfully synthesized co.ering the surface of silico. carbide(SiC)fibers,and the morphology,interfaces and electromagnetic wave absorption performance were *** sample SiC@co.CNT,the minimum reflection loss value can reach-70.22 dB at 11.21 GHz with the thickness of 2.12 *** effective absorbing bandwidth can reach up to 6.03 GHz with the thickness of 1.71 mm,which co.ers the entire Ku *** brings more interfaces between co.particles and CNTs as well as SiC fibers and co.C *** interfacial polarization has been hugely enhanced,and the microwave absorbing properties have been *** article reports on the impedance matching of magnetic and non-magnetic co.ponents and the heterointerface engineering,which can be effective strategy and inspiration to illustrate the relationship between co.ponents,structures and functions of electromagnetic wave absorbing materials.

关键词： metal organic frameworks co.nanocrystals carbon nanotubes Schottky heterointerfaces synergistic effect

Phase co.position, transition and structure stability of functionally graded cemented carbide with dual phase structure

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Central South University of Technology 2007年第2期14卷 149-152页

作者：张立陈述熊湘君贺跃辉黄伯云张传福 State Key Laboratory of Powder metallurgy Central South University changsha mining and metallurgy research institute School of Metallurgical Science and Engineering Central South University

The phase co.position, phase transition and phase structure transformation of the wire-cut section of functionally graded WC-co.cemented carbide with dual phase structure were investigated by XRD phase analysis. It is shown that the co.position of η phase in the co.e zone is co.3W_3C (M_6 C type). The structure of co.alt based solid solution binder phase is fcc type. At the co.ling stage of the sintering process, the phase transition of η phase, i.e. M_6C→M_12C and the martensitic phase transition of the co.alt based solid solution binder phase, i.e. fcc→hcp are suppressed, which facilitates the strengthening of the alloy. Because the instantaneous temperature of the discharge channel is as high as 10 000 ℃ during the wire cutting process, the processed surface is oxidized. Nevertheless, the oxide layer thickness is in micro grade. In the oxide film, η phase is deco.posed into W_2C and co., and co.alt based solid solution binder is selectively oxidized, while WC remains stable due to the existence of carbon co.taining liquid organic cutting medium.

关键词： cemented carbide dual phase structure functionally graded material phase identification fracture toughness testing

Structural self-reco.struction strategy empowering Ni-rich layered cathodes with low-strain for superior cyclabilities

在线全文

学校读者我要写书评

暂无评论

Nano research 2023年第4期16卷 4950-4960页

作者： Zhouliang Tan Yunjiao Li Xiaoming Xi Shijie Jiang Xiaohui Li Xingjie Shen Panpan Zhang Zhenjiang He School of metallurgy and Environment Central South UniversityChangsha 410083China Engineering research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083China changsha research institute of mining and metallurgy Changsha 410083China Office of Laboratory and Equipment Management Xinjiang UniversityUrumqi 830000China

The key to hindering the co.mercial application of Ni-rich layered cathode is its severe structural and interface degradation during the undesired phase transition(hexagonal to hexagonal(H2→H3)),degenerating from the build-up of mechanical strain and undesired parasitic ***,a perovskite Li_(0.35)La_(0.55)TiO_(3)(LLTO)layer is built onto Ni-rich cathodes crystal to induce layered@spinel@perovskite heterostructure to solve the root cause of capacity *** exploration based on structure characterizations,in situ X-ray diffraction techniques,and first-principles calculations demonstrate that such a unique heterostructure not only can improve the ability of the host structure to withstand the mechanical strain but also provides fast diffusion channels for lithium ions as well as provides a protective barrier against electrolyte ***,the LLTO modified LiNi_(0.9)co.(0.05)Mn_(0.05)O_(2)cathode manifests an unexpected cyclability with an extremely high-capacity retention of≈94.6%after 100 cycles,which is superior to the pristine LiNi_(0.9)co.(0.05)Mn_(0.05)O_(2)(79.8%).Furthermore,this modified electrode also shows significantly enhanced cycling stability even withstanding a high cut-off voltage of 4.6 *** surface self-reco.struction strategy provides deep insight into the structure/interface engineering to synergistically stabilize structure stability and regulate the physico.hemical properties of Ni-rich cathodes,which will also unlock a new perspective of surface interface engineering for layered cathode materials.

关键词： Ni-rich layered oxides cathode structural self-reco.struction phase transition mechanical strain first-principal calculation

AN ACCURATE SOLUTION FOR THE SURFACE OF ELASTIC LAYER UNDER NORMAL co.CENTRATED LOAD ACTING ON A RIGID HORIZONTAL BASE

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 1986年第5期7卷 505-513页

作者：文丕华 changsha Central-South institute of mining and metallurgy

On the basis of ref.,this paper deduces an accurate solution for the surface ofelastic layer under normal co.centrated load acting on a rigidhorizontal base,andgives numerical results, which suit civil engineers for r... 详细信息

关键词： exp AN ACCURATE SOLUTION FOR THE SURFACE OF ELASTIC LAYER UNDER NORMAL co.CENTRATED LOAD ACTING ON A RIGID HORIZONTAL BASE

Lithium and manganese extraction from manganese-rich slag originated from pyrometallurgy of spent lithium-ion battery

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2022年第8期32卷 2746-2756页

作者： Guo-xing REN Cai-bin LIAO Zhi-hong LIU Song-wen XIAO School of metallurgy and Environment Central South UniversityChangsha 410083China changsha research institute of mining&metallurgy co. Ltd.Changsha 410012China

Mn and Li were selectively extracted from the manganese-rich slag by sulfation roasting−water *** extraction mechanisms of Mn and Li were investigated by means of XRD,TG−DSC,and SEM−EDS.73.71%Mn and 73.28%Li were leached under optimal experimental co.ditions:acid co.centration of 82 wt.%,acid-to-slag mass ratio of 1.5:1,roasting temperature of 800°C,and roasting time of 2 *** the roasting process,the manganese-rich slag first reacted with co.centrated sulfuric acid,producing MnSO_(4),MnSO_(4)·H_(2)O,Li_(2)Mg(SO_(4))_(2),Al_(2)(SO_(4))_(3),and H_(4)SiO_(4).With the roasting temperature increasing,H_(4)SiO_(4) and Al_(2)(SO_(4))_(3) deco.posed successively,resulting in generation of mullite and *** mullite formation aided in decreasing the leaching efficiencies of Al and Si,while increasing the Li leaching *** formation of spinel,however,decreased the leaching efficiencies of Mn and Li.

关键词： spent lithium-ion battery manganese-rich slag sulfation roasting manganese reco.ery lithium reco.ery

同方期刊数据库

PERFECTLY PLASTIC STRESS FIELD AT A STATIONARY CRACK TIP

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 1985年第5期6卷 431-438页

作者：林拜松 Central-South institute of mining and metallurgy Changsha

Under the hypothesis that all the perfectly plastic stress co.ponents at a cruck tip arethe functions of θ only,making use of yield co.ditions and equilibrium *** the generally analytical expressions of the perfectly plastic stress field at a crack *** these generally analytical expressions to the co.crete *** analyticalexpressions of perfectly plastic stress fields at the tips of Mode I,Mode II,Mode III andMixed Mode I-II cracks are obtained.

关键词： mode line In PERFECTLY PLASTIC STRESS FIELD AT A STATIONARY CRACK TIP

Experimental investigation of particle-induced pressure loss in solid–liquid lifting pipe

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Central South University 2017年第9期24卷 2114-2120页

作者：宋跃文朱小军孙志强唐达生 School of Energy Science and Engineering Central South University State Key Laboratory of the Exploration and Utilization of Deep-sea Mineral Resources(changsha research institute of mining and metallurgy co.Ltd.)

In order to investigate the characteristics of particle-induced pressure loss in the solid–liquid lifting pipe,a series of experiments were co.ducted in 200 mm diameter lifting *** manganese nodules with five different mean diameters of10 mm,20 mm,30 mm,40 mm and 50 mm were used,both in isolation and a co.bination in equal fraction by *** flow velocities in the lifting pipe ranged from 0.12 m/s to 1.61 m/s,and the mass of particles employed was 10 kg for each particle *** regimes,wavy bed,partly fluidization,and fully fluidization,were observed over the flow *** solid–liquid pressure drop data were measured by differential pressure transmitter,and pressure drop caused by the solid particles was calculated and *** results show that the evolutions of the pressure loss due to solid particles are relevant to the solid–liquid flow regimes,and they are distinctly influenced by fluid velocity and particle size.

关键词： lifting pipe pressure loss simulation manganese nodules flow regimes