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Recycling of Spent Nickel-Cadmium Batteries

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International Journal of Minerals,Metallurgy and Materials 2000年第2期14卷 126-131页

作者： Xanghua Kong Pingnan Wu(Metallurgy School, university of Science and Technology beijing,{2.) Metallurgy School University of Science and Technology Beijing Beijing 100083 China

A technique for recycling spent nickel-cadmium batteries, which makes separaion of cadmium and nickel possible, is developed by laboratory-scale experiments. NH3-H2.O3 aqueous solution was used in this leaching technique. Since neutralization and/or solvent extraction were not required in the separation procedure of nickel and cadmium, the closed systemizaion of the process becomespossible. Experimental results show that, (1) if the NH3 concentraion of leaching solution is sufficiently high and the ratio of H2.O3 toNH3 is properly adjusted, both Ni(OH)2.and Cd(OH)2.react with NH, and quickly dissolve into leaching solution, and (2. Ni(OH)2.can beconverted into insoluble NiO by calcination at 500℃, and CdO from Cd(OH)2.by calcination maintains good solubility in NH3-H2.O3aqueous solution. As a conclusion, the recycling technique characterized by two step leaching can be developed based on such changesin dissolution behavior by calcination. Meanwhile, the yields of 99.8% for nickel and 97.6% for cadmium are obtained, and the puritiesof Recycling of Spent Nickel-Cadmium BatterieRecycling of Spent Nickel-Cadmium Batteries Recycling of Spent Nickel-Cadmium Batteriesrecovered nickel and cadmium are 99.9% and 98.6%, respectively.

关键词： nickel-cadmium batteries recycling, ammonia leaching closed system environmental protection

One-step disposal of Cr (Ⅵ)-bearing wastewater by natural pyrrhotite

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Chinese Science Bulletin 2000年第17期45卷 1614-1616页

作者： LU Anhuai, CHEN Jie, SHI Junxian, LU Xiaoying, TANG Junli & GUO Min1. Departmenl of Geology, Peking university, beijing 100871, {2. 2. National Laboratory of Mineral and Rock Materials, {2. university of geosciences, beijing 100083. china (e-mail: luanhuai Department of Geology Peking University Beijing China National Laboratory of Mineral and Rock Materials China University of Geosciences Beijing China

Cr(Ⅵ)-bearing wastewater can be treated by natural pyrrhotite which is used for reductant to reduce Cr(Ⅵ) and precipitant to precipitate Cr(Ⅲ) simultaneously. The disposal products can be divided into three parts in the beakers, namely supernatant in the upper part, the yellowish colloidal precipitates in the middle part and the pyrrhotite in the lower part. The content of total Cr=Cr(Ⅵ)+Cr(Ⅲ) in the supernatant liquid is 0.06 mg/L, which is lower than 1.5 mg/L of the discharge standard of china and near to 0.05 mg/L of the standard of potable water. This one-step disposal composing of both reduction and precipitation which is traditionally divided into two independent steps called reducing technology and precipitating technology respectively. The new method is of obvious economic advantage and favourable to decreasing surplus mud derived from adding Ca(OH)2.to precipitate Cr(Ⅲ) traditionally so as to avoid recontamination. In fact, sodium sulfite (Na2.O3) used in disposal of Cr(Ⅵ) was

关键词： natural pyrrhotite Cr(Ⅵ)-bearing wastewater reduction Cr(Ⅵ) precipitation Cr(Ⅲ) one-step disposal rational use of mineral resources.

Simulation of Temperature and Flow Field by Three Dimension Finite ElementMethod for Castex Process of AS Wire

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International Journal of Minerals,Metallurgy and Materials 1999年第4期13卷 262-267页

作者： Zhiyuan Shi1 Wanjun Wang1 Zhigang Kan2.Jinglin Wen3 Xinhua Wang1(l Metallurgy School, university of Science and Technology beijing,{2.2.university of AViation and Spaceflight beijing,{2.3 Northeastern university, Metallurgy School University of Science and Technology Beijing Beijing 100083 China university of Aviation and Spaceflight beijing Beijing 100083 China Northeastern university Shenyang China

Castex of AS wire is a new technology of near net shape. To study the variation of temperature and velocity of liquid (or semisolid) aluminum during dynamic solidification the numerical simulation was carried out with the theory of heat-transfer and hydrodynamics by means of 3-dimensional finite element method. From simulation results, it is found that the variation of temperature and velocityis mainly influenced by the casting temperature of aluminum, rotating speed of Castex wheel and flow of cooling water. Among theseinfluencing factors, the casting temperature distributes most to the length of liquid phase metal. Moreover, the faster the metal solidifies,the higher the metal there moves with the overall trend of descending from the bottom of the wheel to the shoe wall as well as from sidewalls to the center of wheel groove. In comparison with the practical value, the simulation is reliable.

关键词： Castex dynamic solidification AS wire temperature and flow field, finite element method

Palaeogene Biostratigraphic Characteristics of Red Basins In Western Henan and Its Adjacent Areas, With an Outline of Palaeogene Palaeobiogeographic Provinces of china

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Acta Geologica Sinica(English Edition) 1992年第1期66卷 101-117页

作者： Du Hengjian Ma Ancheng Cheng Jie Wu Weimin china university of {2., beijing beijing Normal university china university of {2., beijing Institute of Crustal Dynamics, State Seismological Bureau, beijing china university of {2. Beijing China

This article is a preliminary summary of Paleogene biostratigraphy of the Liguanqiao, Tantou andYuanqu basins, with a new proposal for Paleogene paleobiogeographic provinces of china. On the basis of asynthetic analysis of the geological data, characters of the mammalian assemblages and their comparisons withother corresponding faunas, a new scheme on Paleogene biostratigraphic subdivision of the basins has been putforward here. Based on differences of biostratigraphic sequences, characteristics of mammalian assemblagesand directions of faults controlling Paleogene basins in china, six Paleogene paleobiogeographic provinces ofchina have been proposed in this paper, that is: Tianshan-Yinshan-Tumen Province; Tarim-North china Prov-ince; Kunlun-Qinling Province, Yangtze Province, Nanling and Southeastern Coastal Province, Qinghai andTibet Province.

关键词： With an Outline of Palaeogene Palaeobiogeographic Provinces of china

Ev Surge Illuminates Pathto Sustainable Mobility

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中印对话（英文版） 2024年第1期38卷 56-58页

作者： china-lndia Dialogue 不详

china's Booming NEVs zhang Yifan occupation:PhD student at the school of Philosophy,Renmin university of china Birth Place:Panzhihua,Sichuan Current Residence:Lijiang,Yunnan Rapid advancements in technological innovation and energy transformation within the automotive industry in recent years have far exceeded *** market share of new energy vehicles(NEVs)in the automotive sector continues to grow,with globally recognized brands like Tesla and domestically acclaimed brands such as Xiaomi frequently capturing the public's attention.

关键词： Sustainable occupation globally

Pyrite Morphology Variations from the Upper Cretaceous Qingshankou Formation Unit 1 in Songliao Basin,Northeast china:Evidence for Excursions of the O2.H2. Redox Transition

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地学前缘 2009年第S1期16卷 93-94页

作者： Pingkang Wang,Chengshan Wang,Yongjian Huang china university of {2.(beijing),beijing 100083.china.

Pyrite is a ubiquitous authigenic mineral in modern anoxic sediments and occurs in ancient sedimentary *** of sedimentary pyrite morphology, which can provide useful information on deposition environments and early diagenetic processes,has become an important aspect for reconstruction of *** Upper Cretaceous Qingshankou Formation Unit 1（K2./sub>qn1）lithology,which occured in the south well of the SLCORE I for Continental Cretaceous Scientific Drilling Project

关键词： pyrite morphology O2.H2. redox transition Songliao Basin Qingshankou Formation Unit 1

Density-functional formula for strongly correlated systems

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Progress in Natural Science:Materials International 2005年第5期15卷 395-401页

作者： WANG Huaiyu1*, HAN Rushan2.and CHEN Nanxian1(1. Department of Physics, Tsinghua university, beijing 100084, {2. 2. Department of Physics, Peking university, beijing 100871, {2.) Dept. of Phys. Tsinghua Univ. Beijing 100084 China Dept. of Phys. Peking Univ. Beijing 100871 China

Density functional method is applied for strongly correlated systems. Based on the assumption that the systems are composed of electrons in singly-occupied orbitals and those in doubly-occupied orbitals, a set of self-consistent equations are obtained by standard variation procedure. The equations consist of two parts. One part is to solve the wave functions of the electrons in singly-occupied orbitals and the other is to solve the wave functions of the electrons in doubly-occupied orbitals. The physical meanings of the terms appearing in the equations are discussed.

关键词： density-functional theory strongly correlated systems doubly-occupied orbital two-particle wave function self-consistent equations.

Experimental remolding on the caprock's 3D strain field of the Indosinian-Yanshanian epoch in Tongling deposit concentrating area

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Science china Earth Sciences 2005年第7期48卷 863-874页

作者： DENG Jun1,HUANG Dinghua2.WANG Qingfei1,WAN Li1,SUN Zhongshi3,YANG Liqiang1 & GAO Bangfei1 1. State Key Laboratory of Geological Processes and Mineral Resources,china university of {2.,beijing 100083.china 2. Faculty of Earth Sciences,china university of {2.,Wuhan 430074,china 3. Department of Earth Sciences,Jilin university,Changchun 130061,china State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 China Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China Department of Earth Sciences Jilin University Changchun 130061 China

Based on field observations and rheology analysis, we perform one analogue experiment and remold the 3D structural frame of Tongling deposit concentrating area firstly. Then we disassemble and dialyze the 3D structures of the model using the methods of "slicing" and "stripping". A series of sliced planes vertical to the fold hinges show similar landscapes of that in the drill hole profiles. Meanwhile, layer stripping analysis indicates that the deformation features of each layer in the model are qualitatively analogical to those obtained from field observations. Through contrasting the 3D structure between the experimental model and the field phenomena, we verify the following 3D deformation features of the caprock in this area: (1) the Tongling area mainly consists of three series of NE S-typed fold groups; (2. in the uniform stress field, the incoherent folds universally develop in different positions, along different axes as well as in different strata; (3) the faults propagate upward which are mostly inter-bedded detachment faults, while the fold amplitudes decrease while going deeper; and (4) the folds and cleavages are highly developed in the Silurian System indicating that the deformation effect of the Indosin-ian-Yanshanian structural layer terminates at this layer, which suggests that the Silurian System is the crucial layer for the inversion between brittle and plastic deformation domains and the underlying strata are subject to the control of another deformation system with distinct properties.

关键词： Tongling deposit concentrating area Indosinian-Yanshanian epoch 3D structural frame of the caprock analogue experiment slicing and stripping analysis structural model.

Contributors and potential of hydrocarbon generation of source rocks by solid-state ^(13)C NMR spectroscopy

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Chinese Science Bulletin 1997年第6期42卷 478-481页

作者： WANGZhaoyun, ZHAO Changyi, CHENG Keming and LU Qinghua1. Research Institute of Petroleum Exploration and Development, china National Petroleum Corporation, beijing 100083. china:2. {2. of Petroleum, beijing, 100083.china Research Institute of Petroleum Exploration and Development China National Petroleum Corporation Beijing China university of Petroleum Beijing China

SOLID-STATE 13C nuclear magnetic resonance （NMR） technique is an effective method to study the texture of material. Under the condition of high magnetic field （400 MHz） and by the application of cross polarization, magic angle spinning （CP/MAS）, total sideband suppression （TOSS）, etc., the content of different textural carbons in kerogen has been quantitatively analyzed by the solid-state 13C NMR spectroscopy of a series of kerogen of thermal simulation samples with Ro value ranging from 0.64% to 1.76%. The results show that

关键词： solid 13C NMR analysis aliphatic carbon potential of hydrocarbon generation of source rocks.