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Effect of Flotation Reagents on the Cake Moisture of Copper Concentrate

International Journal of Minerals,Metallurgy and Materials 2000年第3期14卷 161-164页

作者： Tichang Sun, Quanyuan Song, Chengfan hu, Aiguo Yu ( Resources Engineering School, university of science and technology beijing, beijing 100083, china Daye Iron Mine, Tieshan District, huangshi, hubei 435006, china) Resources Engineering School University of Science and Technology Beijing Beijing 100083 China Daye Iron Mine Tieshan District Huangshi Hubei 435006 China

The effect of reagents used in separating chalcopyrite from pyrite on the cake moisture of the copper concentrate at Daye Iron Mine Mineral Processing Plant was investigated. The results showed that the dosage of lime used for depressing pyrite was the main factor that increased the filter cake moisture of copper concentrate. With increasing the dosage of lime, the cake moisture of copper concentrate increased sharply. The cause was concluded to be the addition of lime to the pulp, which resulted in the formation of floc and a high pH value. The collector Z-200#, used for collecting chalcopyrite, had, as well, an adverse effect on the cake moisture of copper concentrate, but its effect was inferior in respect to that of lime. The cake moisture of copper concentrate can be decreased by changing the method with which lime is added and the pH value of pulp is regulated. The experiment results showed that the sulfuric acid was the best regulator. When the clarified liquor of lime was used as a depressant and the pH value of the pulp was regulated to 6.5€*7.0 by adding sulfuric acid, the cake moisture of copper concentrate was reduced from 15.49% to 13.13%. The examination of chalcopyrite surface by using ESCA (Electron Spectroscopy for Chemical Analysis) showed that calcium sulfate and iron hydroxide had formed on the surface of chalcopyrite when lime was added to the pulp. The formation of calcium sulfate and iron hydroxide on its surface increased the hydrophilicity of chalcopyrite so that its cake moisture increased. The addition of sulfuric acid to the pulp not only removed the calcium sulfate, but also reduced the concentration of iron hydroxide on the surface of chalcopyrite so that the cake moisture of copper concentrate was decreased.

关键词： flotation reagents filtration copper concentrate cake moisture ESCA

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EXPERIMENT AND THERMODYNAMIC ANALYSIS ON THE PHASE STABILITY OF LOW ACTIVATION Fe-Cr-Mn(W,V) ALLOY

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Acta Metallurgica Sinica(English Letters) 2002年第6期15卷 492-498页

作者： Q.M. Yu, B.F. hu, C.C. Jia and EM. ChenSchool of Materials science and Engineering of university of science and technology beijing, beijing 100083, chinaNingxia university, Yinchuan 750021,china School of Materials science and Engineering of university of science and technology beijing Beijing 100083 China

Phase stability of four different chemical component Fe-Cr-Mn(W, V) alloys are investigated by experimental method and thermodynamic model in this paper. It is indicated that the main phase of four alloys after aged under 623, 673, 773K for 200h are austenitic phase. The results of Thermo-Calc, which are based on Gibbs energy, show that the phases of four alloys under ihe same temperature as experimental method are single austenitic phase. The results of experimental method and Thermo-Calc agree well.

关键词： phase stability Fe-Cr-Mn(W V) alloy Thermo-Calc

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Numerical calculation on temperature field of FGH95 alloy droplet during rapid solidification

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Journal of university of science and technology beijing 2003年第3期10卷 51-54页

作者： huanming Chen and Benfu hu Materials science and Engineering School, university of science and technology beijing, beijing 100083,china Physics and Electrical Information Engineering School, Ningxia university, Yinchuan 750021,china Univ Sci & Technol beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China Ningxia Univ Phys & Elect Informat Engn Sch Yinchuan 750021 Peoples R China

The temperature field of FGH95 alloy droplet atomized by plasma rotatingelectrode processing (PREP) during solidification has been calculated through numerical analysisbased on equivalent sensible heat capacity method. And thus the relational curves among temperaturegradient of solid-liquid interface, moving velocity of solid-liquid interface and solid fractionduring solidification have been presented. The results indicate that the relation between averagetemperature gradient of solid-liquid interface and droplet size, and the relation between averagemoving velocity of solid-liquid interface and droplet size can be expressed during solidification.

关键词： FGH95 alloy droplet temperature field numerical calculation

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Effects of Applied Magnetic Field on Corrosion of Beryllium Copper in NaCl Solution

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Journal of Materials science & technology 2010年第4期26卷 355-361页

作者： Jing hu, Chaofang Dong, Xiaogang Li and Kui Xiao Corrosion & Protection Center, university of science and technology beijing, Key Laboratory for Corrosion and Protection of Ministry of Education, beijing 100083, china [a] Corrosion & Protection Center university of science and technology beijing Key Laboratory for Corrosion and Protection of Ministry of Education beijing 100083 china

The effects of an applied magnetic field on the corrosion process of beryllium copper in NaCl solution have been investigated by electrochemical measurements, scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS）. The results showed that a horizontal magnetic field with 0.4 T barely shifted the open circuit potentials （Ecorr） of beryllium copper in NaCl solution with different concentrations. However, the horizontal magnetic field increased the limiting current density of beryllium copper in NaCl solution with low concentration, while decreased the limiting current density of beryllium copper in NaCl solution with high concentration. It was found that magnetic field accelerated the diffusion of CuCl2- away from the electrode surface and delayed the formation of Cu2O. The results of SEM and EDS showed that the inffuence of magnetic field over the elements distribution of the corrosion products differed from the different concentration of the immersion solution.

关键词： Beryllium copper Magnetic field Corrosion

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New Phase Ti_3Co_2Si in the Ti-Co-Si Ternary System at 1100℃

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Journal of Materials science & technology 2000年第1期16卷 91-93页

作者： Xianhua hu, Guoliang CHEN, Cinca Ion and Kequan NI (State Key Lab. for Advanced Metals and Materials, university of science and technology beijing, beijing 100083, china) State Key Lab. for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

A new phase with the appropriate composition of Ti_3Co_2Si is found to exist at 1100℃. The X-ray diffraction of this phase can not be indexed by any other phase in the Ti-Co-Si ternary system and show this phase to b... 详细信息

关键词： Ti Co New Phase Ti3Co2Si in the Ti-Co-Si Ternary System at 1100 Si

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A probable new phase H(Ni_2Ti_9Si_9) in Ti-Ni-Si ternary system at 1100 ℃

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International Journal of Minerals,Metallurgy and Materials 1997年第3期11卷 5-7页

作者： hu Xiaohua CHEN Guoliang NI Kequan (State Key hab for Advanced Metals and Materials, university of science and technology beijing, beijing 100083, china)

A probable new phase was detected in Ni-Ti-Si temary system at 1 100 ℃. ItS composition is aroundM: T: Si = 10: 45: 45 (atom fraction) according to the results of EPMA (Electron Probe Microanalysis) of 4 alloyscontai... 详细信息

关键词： new phase H (Ni_2Ti_9Si_9) phase microstructure chemical composition

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A Partial 1100℃ Isotherm of Ti-Ni-Si Ternary System

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Journal of Materials science & technology 1998年第2期14卷 121-124页

作者： Xiaohua hu Yimin LIU Guoliang CHEN and Kequan NI (State Key Lab. for Adv. Met. Mater., university of science & technology beijing, beijing 100083, china) State Key Lab. for Adv. Met. Mater. University of Science and Technology Beijing Beijing 100083 China

A partial section of Ti-Ni-Si ternary system at 1100℃was constituted with Ni less than 50 ***. Twelve single phase areas were determined. The binary Ti3Si phase proposed to occur at 1100℃ was not found in our investigations. A phase with the composition of Ni2Ti9Si9 detected is possibly a new phase. No linear ternary compound was found. Some of these compounds show noticeable composition range

关键词： Si Ti A Partial 1100 Isotherm of Ti-Ni-Si Ternary System Ni

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INFLUENCE OF TEMPERATURE ON FATIGUE CREEP INTERACTION FRACTURE MAP

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Acta Metallurgica Sinica(English Letters) 1989年第3期2卷 215-218页

作者： ZHANG Hongxue XU Zhichao CHEN Guoliang university of science and technology beijing,beijing,china Professor,faculty of Superalloy,university of science and technology beijing,beijing,china

The relative ratio of fatigue resistance to creep resistance of materials varies with test temper- *** the temperature decreases,the creep resistance,since it is a thermal activation pro- cess,becomes relatively larger than fatigue *** the fatigue damage becomes predominant,and results in expansion of fatigue fracture region(region F),and shrinkage even complete elimination of creep fracture region(region C).A materials parameter Ω can be defined to estimate the temperature at which the creep fracture region is completely de- *** phenomenon could be understood on the basis of the integrated model of compet- itive and cumulative models of fatigue creep interaction.

关键词： creep fracture fatigue fatigue creep interaction superaUoy

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PRECIPITATION HARDENING IN B2-ORDERED NiAl BY Ni_(2)AlTi COMPOUND

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Acta Metallurgica Sinica(English Letters) 2001年第5期14卷 313-318页

作者： W.H. Tian, K. Ohishi and M. Nemoto 1)Department of Materials Physics and Chemistry, university of science and technology beijing, beijing 100083, china 2)Department of Materials science and Engineering, faculty of Engineering 36, Kyushu university, Fuk Dept. of Mat. Phys. and Eng. Univ. of Sci. and Technol. Beijing Beijing 100083 China

Microstructural variations and correlated hardness changes in B2-ordered NiAl containing fine precipitation of Ni2AlTi have been investigated by means of transmission electron microscopy (TEM) and hardness tests. The amount of age hardening is not large as compared to the large microstructural variations during aging. TEM observations have revealed that the L21-type Ni2AlTi precipitates keep a lattice coherency with the NiAl matrix at the beginning of aging. By longer periods of aging Ni2AlTi precipitates lose their coherency and change their morphology to the globular ones surrounded by misfit dislocations. The temperature dependence of the yield strength of precipitate-containing B2-ordered NiAl was investigated by compression tests over the temperature range of 873-1273 K. The fine precipitation of Ni2AlTi was found to enhance greatly the yield strength and the high-temperature strength is comparable with that of superalloy Mar-M200.

关键词： Aluminum Hardening Mechanical properties Nickel Precipitation (chemical)

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PRECIPITATION BEHAVIOUR AND HARDENING OFB2-ORDERED Ni(Al, Ta)

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Acta Metallurgica Sinica(English Letters) 1997年第2期10卷 99-104页

作者： W.H. Tian and M. Nemoto2(Department of Materials Physics, university of science and technology beijing, beijing 100083, china)(Department of Materials science and Engineering, faculty of Engineering, Kyushu university, 812,Fukuoka, Japan) Univ of science and technology Beijing Beijing China

Precipitation of Ni2Al in supersaturated NiAl containing Ta and corresponding hardening have been investigated by hardness measurements and by transmission electron microscope observations. Selected area electron diffraction, high resolution electron microscopy and energy dispersive X-ray spectrometer analysis have shown that the Ni2Al with a hexagonal structure precipitates coherently in the B2-NiAl matrix. Ni2Al is an ordered phase with a. unit cell parameter, aNi2All=aNiAl and CNi2Al= aNiAl. The orientation relationship between the Ni2Al precipitate and the B2-NiAl matrix is (0001)Ni2Al (111)NiAl and [1120]Ni2Al[110]NiAl. NiAlhardens appreciably by the precipitation of Ni2Al phase.

关键词： intermetallic compound precipitation hardening TEM HREM,EDS

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