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Depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 335-345页

作者： Feng zhang Chenyang zhang Linlin Wu Wei Sun Hongliang zhang Jianhua Chen Yong Pei Songjiang Li engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization Hunan International Joint Research Center for Efficient and Clean Utilization of Critical Metal Mineral ResourcesSchool of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083China State Key Laboratory of Mineral Processing Beijing General Research Institute of Mining&MetallurgyBeijing 100160China Hunan Provincial Key Laboratory of Micro&Nano Materials Interfaces Science College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Department of Chemistry Xiangtan UniversityXiangtan 411105China China Railway Resource Group Co.Ltd Beijing 102300China

The depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite still lacked in-depth ***,the depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite was further systematically investigated with experiments and density functional theory(DFT)*** X-ray photoelectric spectroscopy(XPS)results,DFT calculation results,and frontier molecular orbital analysis indicated that sulfite ions were difficult to be adsorbed on sphalerite surface,suggesting that sulfite ions achieved depression effects on sphalerite through other non-adsorption ***,the oxygen content in the surface of sphalerite treated with sulfite ions in creased,which enhanced the hydrophilicity of the sphalerite and further increased the difference in hydrophilicity between sphalerite and ***,sulfite ions were chelated with lead ions to form PbSO_(3)in *** hydrophilic PbSO_(3)was more easily adsorbed on sphalerite than *** interaction between sulfite ions and lead ions could effectively inhibit the activation of *** addition the UV spectrum showed that after adding sulfite ions,the peak of perxanthate in the sphalerite treated xanthate solution was significantly stronger than that in the galena with xanthate solution,indicating that xanthate interacted more readily with sulfite ions and oxygen mo lecules within the sphalerite system,leading to the formation of ***,sulfite ions hardly depressed the flotation of ga lena and could promote the flotation of galena to some *** study deepened the understanding of the depression mechanism o sulfite ions on sphalerite and Pb^(2+)activated sphalerite.

关键词： sphalerite galena sulfite ion density functional theory depression mechanism

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GENERAL SOLUTIONS OF DOUBLY PERIODIC CRACKS IN AN ANISOTROPIC INFINITE PLATE

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Science in China,Ser.A 1985年第1期28卷 94-101页

作者：张孝思 Beijing institute of Civil engineering

Making use of the basic theorem of Jacobi elliptic functions and residues, we obtain the general solutions of the stress intensity factor of doubly periodic cracks in an anisotropic plate under concentrated forces P, T and Q, which are given in this paper. These general solutions are expressed in simply closed forms. It is of interest to find that the stress intensity factor of this problem is the same as the solution of the doubly periodic cracks in an isotropic plate. The conclusion has been drawn by- Liebowytz from the problem of the isolated crack in an anisotropic plate. Of course, using the general solutions in this paper as a fundamental Green’s function, the Other solutions of the doubly periodic cracks in an anisotropic plate under arbitrary forces can be obtained Without any difficulty.

关键词： mode GENERAL SOLUTIONS OF DOUBLY PERIODIC CRACKS IN AN ANISOTROPIC INFINITE PLATE Re

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AN EDGE CRACK AT THE INTERFACE BETWEEN TWO DIFFERENT MEDIA IN A RECTANGULAR SHEET UNDER ANTI-PLANE SHEAR

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Science in China,Ser.A 1985年第1期28卷 86-93页

作者：张孝思 Beijing institute of Civil engineering

In this study, the general solution of the stress intensity factor of a two-layered composite in a rectangular sheet eontaining an edge crack subjected to equal and opposite arbitrary longitudinal shear stress is obtained by use of the Fourier transform and Fourier series. It is of interest to note that the stress intensity factor of this problem is independent of the material constants of the rectangular plate. The conclusion has been deduced by zhang from a two-layered composite in a rectangular sheet with a central crack of Mode Ⅲ.

关键词： AN EDGE CRACK AT THE INTERFACE BETWEEN TWO DIFFERENT MEDIA IN A RECTANGULAR SHEET UNDER ANTI-PLANE SHEAR AT EDGE

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自适应运动目标跟踪系统及其性能研究

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天津大学学报 1998年第5期31卷 632-637页

作者：葛宝臻秦玉文张以谟陈希明王项南天津大学精密仪器与光电子工程学院北方交通大学

提出利用非线性联合变换相关器作为核心实现自适应运动目标跟踪识别系统．给出了自适应跟踪系统对目标的跟踪原理，并对跟踪系统的跟踪性能进行了实验研究．

关键词：光学模式识别光学自适应运动目标跟踪系统

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ANALYSIS OF THE DEFLECTION OF REEDS IN AUTOMOTIVE HYDRAULIC SHOCK ABSORBERS

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Chinese Journal of Mechanical engineering 2000年第3期13卷 241-244页

作者： Chen Yong,Sun Fengchun (School of Vehicular engineering, Beijing institute of Technology) Wang Ying, zhang Jianrong (Taiyuan Heavy Machinery institute Liaoning institute of Technology) 北京理工大学北京太原重型机械学院山西辽宁工学院辽宁锦州

The deformation of reeds in automotive hydraulic shock absorbers is analyzed with the finite element method. Combination of different thick reeds mounted on different supports is studied. The computational results show that deformation of the overlapped reeds is not always equal to the sum of deflection of single reed under any conditions. Experimental results prove computational results to be correct and computational method effective. The method of analysis and view of point can provide reference to the design and manufacture of hydraulic shock absorbers using reeds.

关键词： Hydraulic shock absorber Reed Finite element method

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Experimental Study of Motion of Nitrogen Taylor Bubbles and Liquid Slugs in Inclined Tubes

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Chinese Journal of Aeronautics 2009年第4期22卷 349-354页

作者： zhang Hua,Wang Shuhua,Wang Jing institute of engineering Thermo-physics,Shanghai Jiao Tong University,Shanghai 200240,China [a]institute of engineering Thermo-physics Shanghai Jiao Tong University Shanghai 200240 China

This article studies rising velocity of Taylor bubbles and liquid slugs in liquid nitrogen at different axial positions in upward inclined tubes by means of a high speed motion analyzer. The bottom-closed tubes in the experiments are 1.0 m long with an inner diameter of 0.014 m or 0.018 m. The tube inclines upward from 0~ to 50~ with respect to the normal. Statistical method is used to analyze the data of the Taylor bubble and the liquid slug velocity. Reflecting the effects of the inclination angle on the rising velocity of Taylor bubbles and liquid slugs, the experimental results indicate the similar trend the Taylor bubble velocity and the liquid slug velocity have： it increases first, and then decreases with the increase of the inclination angle. Moreover, with the increase of the inclination angle, the liquid slug velocity becomes greater than Taylor bubble velocity.

关键词： cryogenic two-phase flow rising velocity high speed motion analyzer liquid nitrogen Taylor bubble liquid slug inclined tube

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Development of Mathematical Model on Preparation of Functionally Graded Material by Co-sedimentation

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Journal of Materials Science & Technology 2001年第2期17卷 275-277页

作者： Zhongmin YANG, Lianmeng zhang and Qiang SHEN institute of Materials Science and engineering, Wuhan University of Technology, Wuhan 430070, China Wuhan Univ Technol Inst Mat Sci & Engn Wuhan 430070 Peoples R China

From the process of sedimentation the mathematical relationships among deposition Volume and powder properties as well as sedimentation parameters were deduced. Based on the formula a mathematical model was set up and simulated through the computer. At last the validity of mathematical model was supported by the representative experiment on Ti-Mo system FGM prepared by co-sedimentation.

关键词： Co Mo Development of Mathematical Model on Preparation of Functionally Graded Material by Co-sedimentation

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Influence of Friction Condition on Cold Upsetting of Tube Flange

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Journal of Materials Science & Technology 2001年第1期17卷 155-156页

作者： Jun LU Zhongjin WANG and Mingxue zhang School of Materials Science and engineering, Harbin institute of Technology, Harbin 150001, China Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

FEM is used to analyze the influence of interface friction on the material flow and the cause of forming defect in the cold upsetting of tube flange. Based on the FEM simulation results, the relationships between flange width and the extreme friction factors are established. The concept of forming limit diagram for cold upsetting of tube flange is presented.

关键词： Influence of Friction Condition on Cold Upsetting of Tube Flange

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Application of Fractal Theory in the Synthesis of Nano-sized 3Y-TZP Superplastic Ceramic Materials

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Journal of Materials Science & Technology 2001年第1期17卷 121-122页

作者： Guofeng WANG Kaifeng zhang and Dezhong WU School of Materials Science and engineering, Harbin institute of Technology Harbin 150001, China Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

Nano-sized 3Y-TZP powders were Synthesized by two methods. A fractal software was developed. A new and convenient method for characterizing the quality of Synthetic process by using fractal theory was obtained.

关键词： Nano TZP

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NUMERICAL CALCULATION FOR 2-DIMENSIONAL HEAT TRANSFER IN KEYHOLE LASER WELDING

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Chinese Journal of Mechanical engineering 1998年第3期11卷 20-25页

作者： Xu Jiuhua zhang Jingzhou Jiang Chengyu Luo Yumei Mechanical engineering institute, Nanjing University of Aeronautics and Astronautics Nanjing Univ of Aeronautics and Astronautics Nanjing China

A numerical method is presented for analysing 2 dimensional quasi steady state heat transfer in high power density laser keyhole welding processes. The mathematical model is established according to the conservation of mass, momentum and energy. Computation is performed by using the finite control volume method in the curvilinear coordinate system. A position prediction correction procedure is employed to identify the solid liquid interface location. This method is applied to the study of a typical keyhole welding process of an AISI 304 stainless steel plate and its feasibility is verified.

关键词： Laser welding Heat transfer Keyhole Temperature distribution

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