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Application of Single Neuron Adaptive PID Regulators with Auto-tuning Gain in Industrial Parameter(Pressure)Closed-loop Process Control Systems

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International Journal of Minerals,Metallurgy and Materials 1999年第2期13卷 152-153页

作者： Shaoyuan Sun Huade Li Bin Qian Jianping Wei(Information engineering school, university of science and technology beijing, beijing 100083, china) Information engineering school University of Science and Technology Beijing Beijing 100083 China

A type of single neuron adaptive PID regulator with auto-tuning gain is proposed and applied to the work control of fans, waterpumps and air-pressers etc. in Handan Iron & Steel Compel china. The robusthess of induStr... 详细信息

关键词： single neuron gain adaptiVe PID regulator pressure closed-loop control

Cleaning of Chromate Manufacture Process

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International Journal of Minerals,Metallurgy and Materials 2000年第2期14卷 132-134页

作者： Xing Zou Yi Zhang(Applied science school, university of science and technology beijing, beijing 100083, china)(Institute of engineering Chemistry and Metallurgy, Chinese Academy of sciences, beijing 100080, china) Applied science school University of Science and Technology Beijing Beijing 100083 China Institute of engineering Chemistry and Metallurgy Chinese Academy of Sciences Beijing 100080 China

Sodium chromate solubility is determined in the range of NaOH concentrations from 450 to 810 g/L andsolution temperatUres from 30 to 110℃. The optimized conditions to separate sodium chromate from NaOH inleached solution are resolved. It is first found the method to efficiently separate sbdium chromate from NaOH andsodium altuninate in crude sodium chromate. Bench-scale studies on the separating are performed. Finally, goodseparation results are achieved.

关键词： chromate separation clean process

Kinetics of Nitrogen Removal from Molten Steel under Vacuum and Gas-Blowing Conditions

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International Journal of Minerals,Metallurgy and Materials 1998年第1期12卷 5-8页

作者： Jie Fu Heming Chang Shixiang Zhou Boping Chen (Metallurgy engineering school, university of science and technology beijing, beijing 100083, china) Metallurgy engineering school University of Science and Technology Beijing Beijing 100083 China

The kinetics of nitrogen removal from molten steel under vacuum and gas-blowing conditions has beenstudied during the VIM process. The experimental results indicated that vacuum affected the kinetics of nitrogenremoval in the range of 67-5 360 Pa. At 67 Pa, the rate of nitrogen removal is controlled by the liquid phase masstransfer of nitrogen in molten steel. At 2 680Pa, the limited step for nitrogen removal from molten steel is the chemical reaction at the metal/gas interface. Under the present experimental conditions, the type (Ar, CO, CO2) and quantity of gas flowed have no evident influences on the rate of nitrogen removal. The ratio of nitrogen removal of gasbubbles is less than 3 %. Based on the experimental results, the mechanism of nitrogen removal during the VDprocess with argon blowing and the other melting or secondary refining processes with carbon-oxygen reaction havebeen discussed. Some new viewpoints are proposed.

关键词： kinetics nitrogen removal vacuum gas-blowing

Extracting Gold Fines from Pyrite Slag by Hydrophobic Flocculation Flotation

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International Journal of Minerals,Metallurgy and Materials 1998年第1期12卷 1-4页

作者： Ruihua Li Jirang Cui Shaoxian Song Shouci Lu (Resources engineering school, university of science and technology beijing, beijing 100083, china) Resources engineering school University of Science and Technology Beijing Beijing 100083 China

In order to extract gold fines from pyrite slag, the hydrophobic flocculation flotation (HFF) was studied and compared with conventional flotation. The main parameters of HFF such as flotation reagent, surfactant dosage. the duration of agitation and the amount of non-polar oil were investigated, and the effect of non-polar oil was analyzed particularly. It is demonstrated that the HFF is better for gold extraction from pyrite slag than the conventional flotation, and the non-polar oil and the intensive agitation are the key to improve the Au contents and recovery in the concentrate. HFF was used to treat the pyrite slag from the west of Jiangxi province, whose gold contentsare 2.949/t and the size of which are smaller than 10μm. The gold concentrate with gold grade 126.3 g/t and 51 .35% recovery was obtained. Thus, a new method of extracting gold fines from pyrite slag is developed using HFF.

关键词： pyrite slag hydrophobic flocculation flotation gold

Wear characteristics of spheroidal graphite roll WC-8Co coating produced by electro-spark deposition

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Rare Metals 2010年第2期29卷 174-179页

作者： WANG Jiansheng, MENG Huimin, YU Hongying, FAN Zishuan, and SUN Dongbai school of Materials science and engineering, university of science and technology beijing, beijing 100083, china school of Materials science and engineering University of Science and Technology Beijing

Electro-spark deposition（ESD） was adopted for preparing high property coatings by depositing WC-8Co cemented carbide on an spheroidal graphite roll *** microstructure and properties of the coating were investigated by X-ray diffraction（XRD）, scanning electron microscopy（SEM） with energy dispersive X-ray（EDX） and ball-disc configuration wear *** results show that nanosized particles and amorphous structures prevail in the coating which is metallurgically bonded to the *** microstructures of the transition zone include columnar structure and equiaxed *** primary phases of the coating contain W2C, W6C2.54, Fe3W3C, and *** results of abrasive test show that the coating has low friction coefficients（μaverage = 0.18） and the wear mechanisms are mainly abrasive wear, fatigue wear, and oxidation *** maximum microhardness value of the coating is about 17410 N/*** study reveals that the electro-spark deposition process has better coating quality and the coating has high wear resistance and hardness.

关键词： electro-spark deposition WC/Co coatings wear resistance microstructure

Sintering Mechanism of Stainless Steel in Powder Injection Molding

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International Journal of Minerals,Metallurgy and Materials 2000年第1期14卷 51-54页

作者： Chengchang Jia Shimin Fan ying Peng Xiaojie Zhao Xiaosen lu Material science and engineering school, university of science and technology beijing, beijing 100083, china beijing Tungsten and Molybdenum Factory, beijing 102206, china beijing Hard Me Material science and engineering school University of Science and Technology Beijing Beijing 100083 China beijing Tungsten and Molybdenum Factory Beijing 102206 China beijing Hard Metal Factory Beijing 100055 China

Stainless steel samples were made by Powder injection Molding (PIM) process with-400 mesh powder in order to investigate the sintering mechanism in this system and develop the PIM of stainless steels. The process included mixing, injection molding, debin- ding and sintering. Neck growth model was used to analyze the sintering mechanism. The results show that lattice (volume) diffusion is the main mechanism in the sintering process, the products with higher density (>95%) and properties are obtained. At lower temperatures, grain boundary diffusion may play a role in the sintering densification.

关键词： sintering mechanism powder injection molding stainless steel, volume diffusion

Two-dimensional simulation on the rolling process of semi-solid 60Si2Mn by finite element method

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Journal of university of science and technology beijing 2002年第4期9卷 273-276页

作者： Renbo Song, Yonglin Kang, Xueping Ren, Hongbo Dong, and Jiwen WangMaterials science and engineering school, university of science and technology beijing, beijing 100083, china Mat. Sci. and Eng. Sch. Univ. of Sci. and Technol. Beijing Beijing 100083 China

The effect of various process variables on the law of metal flow for semi-solid rolling 60Si2Mn was studied by finite element method. Semi-solid 60Si2Mn can be described as compressible rigid visco-plastic porous material saturated with liquid. In terms of ther-mo-mechanical coupling condition, the distributions of stress, velocity and temperature were studied using software MARC. The simulation results show that the rigid visco-plastic model can accurately describe the semi-solid 60Si2Mn rolling process. The great deformation can achieve completely in view of low flow stress of semi-solid slurry.

关键词： finite-element analysis semi-solid thermo-mechanical coupling compressible rigid visco-plastic model rolling

Anisotropic characteristic in HDDR Nd_(13)Fe_(80)B_7

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Journal of university of science and technology beijing 2003年第3期10卷 26-29页

作者： Jingzhi Han, Aizhi Sun, Yaofu Xiao, Xubo Liu, and Run WangMaterials science and engineering school, university of science and technology beijing, beijing 100083, china Materials science and engineering school University of Science and Technology Beijing Beijing 100083 China

The function of disproportionation and desorption stages ofhydrogenation-disproportionation-desorption-recombination (HDDR) process in the formation ofmagnetic anisotropy was studied. The results showed that degree of anisotropy (DOA) ofNd_(13)Fe_(80)B_7 induced by appropriate HDDR process is comparable with that ofNd_(13)Fe_(80-x)B_7M_x (M=Co, Zr or Ga), however, the moderate coercive force of Nd_(13)Fe_(80)B_7magnetic powder led to an undesirable (BH)_(max) of 104 kJ/m^3 in bonded magnet. Experimentsdemonstrated that a relatively short disproportionation time, combined with a high desorptiontemperature and slow desorption rate, during HDDR process is beneficial to anisotropy attainment,but HDDR Nd_(13)Fe_(80)B_7 magnetic powder becomes isotropic if the disproportionation time islonger than a certain period. This phenomenon strongly indicated that the origin of anisotropy inNdFeB-type HDDR material is contributed by disproportionation stage. XRD (X-ray Diffraction)analysis and TEM (Transmission Electron Microscope) observation told that no other phase exceptNdH_2, alpha-Fe and Fe_2B has been found in the disproportionation step. The formation of HDDRNd_(13)Fe_(80)B_7 anisotropy might be related to the early lamella disproportionation structure.

关键词： HDDR anisotropy isotropy NdFeB

Analysis on Microstructure and Misorientation of Ultrathin Hot Strip of Low Carbon Steel Produced by Compact Strip Production

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Journal of Materials science & technology 2002年第6期18卷 501-503页

作者： Hao YU, Yonglin KANG and Jie FUschool of Materials science and engineering, university of science and technology beijing, beijing 100083, china Sch. of Mat. Sci. and Eng. Univ. of Sci. and Technol. Beijing Beijing 100083 China

The microstructure and misorientation of ultrathin hot strip were analyzed by CSP technology using electron back scattered diffraction (EBSD) method and Autoforge finite element program. The experimental results showed that the finishing hot rolling microstructures were the mixture of recrystallized and deformed austenite. After phase transformation, ferrite grains embody substructures and dislocations, leading to the high strength and relatively low elongation rate of the ultrathin hot strip. The FEM simulation of strain mode and distribution in deformation area has been fulfilled. The simulation results are in good agreement with the theoretical analysis and experimental results.

关键词： CSP Electron back scattered diffraction, Texture, Finite element method