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Effect of Modification Treatment for Reduction of Dephosphorization Slag in Hot Metal Bath

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Journal of Iron and Steel Research International 2013年第1期20卷 1-6,20页

作者： jiang Mao-fa CUI Yu-yuan WANG De-yong MIN Yi LIU cheng-jun Institute of Ferrous Metallurgy School of Materials and MetallurgyNortheastern University

To extract the valuable elements from the steel slag, a novel approach has been proposed by modification treatment to provide the stronger driving forces and accelerate the reduction. Three types of dephosphorization steel slags were reduced using carbon-saturated iron bath to extract iron and phosphorus simultaneously. During the process of reduction, slag composition, temperature, and original P2O5 content were investigated respectively. Slag modification treatment, adding either silica or alumina to vary the slag composition, was proven to accelerate the reduction of dephosphorization slag. The equilibrium time can be shortened from 60 to 30 min. Slag modification also allowed the reduction reaction to occur at lower temperature. After slag modification, the original P2O5 content in slag presents a slight difference on reduction process. Almost half of the reduced phosphorus was vaporized within 5 and 20 min. As more and more FeO was reduced, CO gas generation decreased, and evaporation amount of phosphorus therefore decreases.

关键词： dephosphorization slag reduction modification treatment phosphorus vaporization

Three-dimensional modeling of pollutants transportation in the flow field around a spur dyke

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International Journal of Sediment Research 2012年第4期27卷 510-520页

作者： Li-ping CHEN Jun-cheng jiang Guang-fa DENG Hui-fang WU College of Civil Construction and Safety Engineering Nanjing University of Technology

Pollutants are carried by sediment-laden flow dissolved in water or adsorbed on sediment particles. A transient three-dimensional model based on a compressible VOF(volume of fluid) method was developed to simulate the transport of dissolved and particulate *** is a numerical technique for acquiring and tracking the free surface of water *** scouring,deposition and re-suspension were simulated and the processes of adsorption and desorption of pollutants on suspended sediment were analyzed.A series of experiments and numerical simulations were performed to study the transportation and dispersion of pollutants in the flow around a non-submerged spur dyke in a straight flume of rectangular *** simulation results agreed well with the experimental results.A certain volume of pollutants solution was released into the flow at upstream of the spur *** concentration reduced with *** concentration reduction was slower in the circumfluence zone than in the main *** ratio of adsorption to desorption coefficients was different for pollutants on suspended sediment with different *** peak concentration of dissolved pollutants increased with the ratio of the adsorption to the desorption *** angle of the spur dyke affected the peak concentration around the *** effect of the angle on dissolved pollutants decreased with the ratio of adsorption to desorption *** adsorption and desorption coefficients,as well as the saturated adsorption capacity had no effect on the concentration of particulate pollutants.

关键词： Spur dyke Suspended sediment flow Pollutant Adsorption Desorption

Four new sesquiterpene derivatives from Dendrobium findlayanum

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Chinese Journal of Natural Medicines 2019年第12期17卷 900-905页

作者： YANG Dan cheng Zhong-Quan ZI cheng-Ting YANG Liu DONG fa-Wu HU jiang-Miao ZHOU Jun State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China School of Chemistry and Pharmaceutical Sciences Guangxi Normal UniversityGuilin 541004China Guilin Layn Natural Ingredients Corp. Guilin 541004China

Three new sesquiterpene glycosides with alloaromadendrane and ylangene-derived type aglycones,named dendrofindlayanosides A-C(1-3),one new cyclopacamphane type sesquiterpene named dendrofindlayanobilin A(4),together with five known compounds have been isolated from stems of Dendrobium *** structures were determined on the basis of spectroscopic and chemical methods.

关键词： Dendrobium findlayanum Sesquiterpene derivatives Alloaromadendrane Cyclopacamphane

Inclusions and solidification structures of high pure ferritic stainless steels dual stabilized by niobium and titanium

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Rare Metals 2014年第6期33卷 761-766页

作者： Hong-Po Wang Li-Feng Sun Jun-Jie Shi cheng-Jun Liu Mao-fa jiang Chi Zhang Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) Northeastern University

As the raw materials in the post process of rolling and heat treatment, ingots have great effects on the properties of the final products. Inclusions and solidification structures are the most important aspects of the quality of ingots. Niobium and titanium are usually used to react with carbon and nitrogen to improve the properties of ferritic stainless steels. In this research, combined with thermodynamic calculation, effects of niobium and titanium on the inclusions and solidification structures in three kinds of high pure ferritic stainless steels with different titanium additions were investigated by optical microscope（OM）, scanning electron microscope（SEM）, transmission electron microscope（TEM）, and energy disperse spectrometer（EDS）. Results show that Al2O3 and a few（Nb,Ti）N particles form when titanium addition is 0.01 %.Furthermore, inclusions are mainly Ti N and Al2O3–Ti Ox–Ti N duplex inclusions when titanium addition is more than0.10 %. Those two types of inclusions are in well distribution, and can afford nuclei to the solidification ***, the ratio of equiaxed zone increases with the increase of titanium addition. The ratio increases from42.1 % to 64.0 % with the titanium addition increasing from 0.01 % to 0.10 %, and it increases to 85.7 % when the titanium addition reaches 0.34 %.

关键词： High pure ferritic stainless steel Inclusion Solidification structure Equiaxed zone Stabilization element

SYSTHESIS OF DOUBLE-HYDROPHILIC CORE-SHELL TYPE MULTIARM STAR COPOLYMER POLYETHYLENIMINE-block-POLY(2-HYDROXYETHYL METHACRYLATE)

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Chinese Journal of Polymer Science 2013年第7期31卷 1046-1055页

作者： Qiang Tang fa cheng Jin Cui 陈宇 School of Chemical and Environmental Engineering Hubei University of Technology Department of Chemistry School of SciencesTianjin University National Foodstuff Inspection Center Tianjin Product Quality Inspection Technology Research Institute

Multiarm star block copolymers hyperbranched polyethylenimine-b-poly（2-hydroxyethyl methacrylate）（HPEI-b- PHEMA） with average 28 PHEMA arms have been prepared by atom transfer radical polymerization （ATRP） of HEMA in a mixed solvent of methanol and water using a core-first strategy. The hyperbranched macroinitiator employed was prepared on the basis of well-defined hyperbranched polyethylenimine with Mw/Mn of 1.04 by amidation with 2-bromo-isobutyryl bromide. The polymerization condition was optimized to prepare star copolymers with narrow dispersity, and the variables included the volume ratio of methanol to water, the molar ratio of initiating site to CuC1 and the molar ratio of [CuCl]：[CuBr2]. Under the optimized polymerization condition, the lowest Mw/Mn value of the obtained star copolymers was around 1.3. Kinetic analysis showed that an induction period existed in the polymerization of HEMA. After this induction period, a linear dependence of ln（[M]0/[M]t） on time was observed. The obtained HPEI-b-PHEMA could adsorb hydrophilic molecules. The comparison with the star copolymer with hydrophobic core and hydrophilic PHEMA shell verified that both the hydrophilic core and shell could host the hydrophilic guests, but the amidated HPEI core was more effective than the PHEMA shell.

关键词： Atom transfer radical polymerization Hyperbranched Polyethylenimine Poly(2-hydroxyethyl methacrylate) Star polymers.

Exergy Analysis and Optimization of Ladle Furnace Refining Process

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Journal of Iron and Steel Research International 2010年第11期17卷 24-28页

作者： MIN Yi jiang Mao-fa School ofMaterials and Metallurgy Northeastern University Shenyang 110819 Liaoning China

To decrease energy consumption of ladle furnace, exergy analysis and optimization were conducted based on the ladle furnace refining process of modern clean steelmaking. Exergy analysis results showed that exergy loss induced by unavailable electric energy is the largest, and the electric energy efficiency is 46.20%. To cut down the unavailable electric energy, industrial experiments of submerged arc heating were carried out combined with slag composition modification. Results showed that submerged arc heating can be achieved within most heating period, average heating rate increased by 0. 5 ℃/min, unavailable electric energy decreased by 21. 730 MJ per ton steel, and electric energy efficiency was enhanced by 14.84 %. As the refining cycle was shortened, the exergy loss induced by heat elimination decreased from 19. 455 MJ per ton steel to 11. 066 MJ per ton steel.

关键词： LF exergy analysis exergy loss submerged arc heating

A Finite Element Based Study on Lowering Operation of Subsea Massive Structure

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China Ocean Engineering 2017年第5期31卷 646-652页

作者： WANG fa-cheng WANG Jun TANG Ke Department of Civil Engineering Tsinghua University COTEC Offshore Engineering Solutions

Subsea production system has been increasingly used in recent South China Sea offshore developments. With deepwater applications, constituent parts of subsea systems become more complicated and enlarged. Increases on the weight and geometry of each component bring challenges to installations. A recent accomplished deployment on a subsea massive jumper shows the weight and length have been up to 120 tons and 90 m, respectively with sophi- sticated geometry. It is considerably difficult to install heavy and large subsea structures, especially in South China Sea where severe environmental conditions are common. In addition, deepwater deployment may alter natural frequency of the hoisting system and the altered frequency may be close to possible environmental conditions. To deal with the above two issues, traditionally, engineers need to carry out series of complicated numerical analyses which are on case basis and significantly time-consuming. Existing studies focus on the optimization on analysis techniques by conducting laboratory testing and numerical simulations. However, easy-to-use guidance on massive subsea structure installation are somewhat limited. The studies presented in this paper aim to achieve a simplified guidance which can briefly screen the cases subject to axial resonance and provide visible correlations between hoisting system integrity and key installation parameters.

关键词： subsea massive saucture sensitivity analysis DAF

Transient Response in a Bi-material Cylinder of Soft Ferromagnetic Material Subjected to Magnetic Shock

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Acta Mechanica Solida Sinica 2021年第2期34卷 286-296页

作者： Zhangjianing cheng Quan jiang College of Civil Engineering Tongji UniversityShanghai 200092China School of Transportation and Civil EngiTieering Nantong UniveirsityNantong 226019China

The transient response in a bi-material cylinder of soft ferromagnetic material under magnetic shock is investigated in this *** analytical solutions for displacement and stress have been derived using the finite Hankel transform and the Laplace *** numerical examples show that the displacement and stress fields respond dynamically in the bi-material cylinder under magnetic *** derived displacement at the center and radial stress on the surface of the cylinder satisfy the boundary conditions,showing the correctness of *** displacement and stress waves propagate from the surface to the center of the cylinder when the magnetic field is *** stress fields increase from the center to the surface of the cylinder and are much larger than the quasi-static state since the waves reflect,collide and concentrate in the body of the *** method of this paper can be used in the design of soft ferromagnetic structures.

关键词： Soft ferromagnetic material Bi-material cylinder Transient stress Magnetic shock

An improved initial rotor position estimation method using high-frequency pulsating voltage injection for PMSM

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Defence Technology（防务技术） 2024年第3期33卷 19-29页

作者： Yang jiang Ming cheng School of Electrical Engineering Southeast UniversityNanjing 210096China

High frequency pulsating voltage injection method is a good candidate for detecting the initial rotor position of permanent magnet synchronous ***,traditional methods require a large number of filters,which leads to the deterioration of system stability and dynamic *** order to solve these problems,a new signal demodulation method is proposed in this *** proposed new method can directly obtain the amplitude of high-frequency current,thus eliminating the use of filters,improving system stability and dynamic performance and saving the work of adjusting filter *** addition,a new magnetic polarity detection method is proposed,which is robust to current measurement ***,experiments verify the effectiveness of the method.

关键词： Initial position detection Signal demodulation algorithm Magnetic polarity detection Filter elimination