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RATE OF SILICOTHERMIC REDUCTION OF TiO_2 IN TiO_2 CONTAINING SLAG MELT

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中国有色金属学会会刊：英文版 1996年第2期6卷 49-52页

作者： Yang Baoxiang Li Zaimiao(panzhihua iron and steel institute, panzhihua 617000) panzhihua iron & steel inst PANZHIHUA 617000PEOPLES R CHINA

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关键词： mathematic model silcothermic reduction TiO2 containing slag melt

CORRELATION OF ION-CLUSTER STRUCTURE WITH BULK VISCOSITY AND DENSITY OF TiO_2-BEARING MOLTEN SLAG

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Acta Metallurgica Sinica(English Letters) 1992年第11期5卷 334-339页

作者： DIAO Risheng WANG Xiqing WANG Huaiyong ZHANG Rong iron and steel Research institute,panzhihua iron and steel Company,Sichuan,ChinaDU Hegui Northeast University of Technology,Shenyang,China panzhihua iron and steel Co Panzhihua China

An approach was made to correlate the proposed model of ion-cluster structure and structural parameter of TiO_2-bearing pentan system of molten slag with ***- sults showed that an increase of ions with 4-coordination number in molten slag makes the increase of bulk viscosity and the decrease of density,while ions with 6-coordination number are the *** structural parameter proposed is so fairly interrelated to the properties of slag,that it may be available for the prediction about *** comparison with ions of 4-coordination *** is more effective than Al and Si.

关键词： TiO_2 molten slag ion-cluster bulk viscosity density

B3 Spline Function Method Used in Simulating Flatness and Profile of Cold Rolled Strip

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Journal of iron and steel Research International 2004年第5期11卷 32-36页

作者： LI Jun-hong QI Xiang-dong LIAN Jia-chuang panzhihua iron and steel Research institute Yanshan University

The layer thermal conductivity during constraint cooling of hot rolled coil was described by using equivalent thermal conductivity model and finite element method. Two radial stress concentration zones in constraint cooled coil were shown by numerical analysis, and the tension stress was assumed to be the main factor to induce stress corrosion. The experimental results show that the longer the water cooling time is, the smaller the grain size and the more uniform the grains are.

关键词： constraint cooling numerical analysis stress corrosion hot rolled coil

Finite Element Analysis of 3-D Electromagnetic Field in Bloom Continuous Casting Mold

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Journal of iron and steel Research International 2007年第3期14卷 6-12页

作者： LIU Xu-dong YANG Xiao-dong ZHU Miao-yong CHEN Yong YANG Su-bo School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China iron and steel Research institute Panzhihua Iron and Steel Group Co Panzhihua 617062 Sichuan China

Three-dimensional finite element model of electromagnetic stirrer was built to predict magnetic field in a bloom continuous casting mold for steel during operation. The effects of current intensity, current frequency, and mold copper plate thickness on the magnetic field distribution in the mold were investigated. The results show that the magnetic induction intensity increases linearly with the increase in current intensity and decreases with the increase in current frequency. Increasing current intensity and frequency is available in increasing the electromagnetic force. The Joule heat decreases gradually from surface to center of bloom, and a maximum Joule heat can be found on corner of bloom. The prediction of magnetic induction intensity is in good agreement with the measured values.

关键词： mold electromagnetic stirring finite element analysis numerical simulation

Oxidation kinetics of ilmenite concentrate by non-isothermal thermogravimetric analysis

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Journal of iron and steel Research International 2017年第7期24卷 678-684页

作者： Ying-yi Zhang Wei Lv Xue-wei Lv Chen-guang Bai Ke-xi Han Bing Song College of Material Science and Engineering Chongqing University panzhihua iron and steel Research institute

The non-isothermal oxidation experiments of ilmenite concentrate were carried out at various heating rates under air atmosphere by *** oxidation kinetic model function and kinetic parameters of apparent activation energy（Ea）were evaluated by Málek and Starink *** results show that under air atmosphere,the oxidation process of ilmenite concentrate is composed of three stages,and the chemical reaction（G（α）=1-（1-α）~2,whereαis the conversion degree）plays an important role in the whole oxidation *** the first stage（α=0.05-0.30）,the oxidation process is controlled gradually by secondary chemical reaction with increasing conversion *** the second stage（α=0.30-0.50）,the oxidation process is completely controlled by the secondary chemical reaction（G（α）=1-（1-α）~2）.At the third stage（α=0.50-0.95）,the secondary chemical reaction weakens gradually with increasing conversion degree,and the oxidation process is controlled gradually by a variety of functions;the kinetic equations are G（α）=（1-α）^（-1）（β=10K·min^（-1）,whereβis heating rate）,G（α）=（1-α）^（-1/2）（β=15-20K·min^（-1））,and G（α）=（1-α）^（-2）（β=25K·min^（-1））,*** the whole oxidation process,the activation energies follow a parabolic law with increasing conversion degree,and the average activation energy is 160.56kJ·mol^（-1）.

关键词： Ilmenite Oxidation kinetics Phase composition Málek method Starink method

Isothermal reduction kinetics of panzhihua ilmenite concentrate under 30vol% CO–70vol% N2 atmosphere

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International Journal of Minerals,Metallurgy and Materials 2017年第3期24卷 240-248页

作者： Ying-yi Zhang Wei Lü Xue-wei Lü Sheng-ping Li Chen-guang Bai Bing Song Ke-xi Han College of Materials Science and Engineering Chongqing University Chongqing 400044 China panzhihua iron and steel Research institute Panzhihua 617000 China

The reduction of ilmenite concentrate in 30vol% CO–70vol% N_2 atmosphere was characterized by thermogravimetric and differential thermogravimetric(TG–DTG) analysis methods at temperatures from 1073 to 1223 *** isothermal reduction results show that the reduction process comprised two stages;the corresponding apparent activation energy was obtained by the iso-conversional and model-fitting *** the first stage,the effect of temperature on the conversion degree was not obvious,the phase boundary chemical reaction was the controlling step,with an apparent activation energy of 15.55–40.71 k J·mol^(–1).For the second stage,when the temperatures was greater than 1123 K,the reaction rate and the conversion degree increased sharply with increasing temperature,and random nucleation and subsequent growth were the controlling steps,with an apparent activation energy ranging from 182.33 to 195.95 k J·mol^(–1).For the whole reduction process,the average activation energy and pre-exponential factor were 98.94^(–1)18.33 k J·mol^(–1) and 1.820^(–1).816 min^(–1),respectively.

关键词： ilmenite isothermal reduction kinetics carbon monoxide

Thermodynamics Behavior of Titanium for BOF Smelting Bearing steel

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Journal of iron and steel Research International 2006年第6期13卷 74-78页

作者： LIU Yue WU Wei LIU Liu LIU Ming LI Yang-zhou institute for Metallurgical Technology Central Iron and Steel Research Institute Beijing 100081 China Department of Material Panzhihua Iron and Steel Research institute Panzhihua 617000 Sichuan China

When titanium element appears in bearing steel, it is very easy to create titanium nitride inclusion, which reduces the fatigue life of bearing steel. Based on the production data of bearing steel produced by BOF, it is found that the titanium takes its source in bearing steel; the factors-affecting titanium content, and the thermodynamics behavior of titanium under smelting condition were studied. The results show that the prime reasons of titanium content increment are the soluble aluminum content and the titanium oxide of slag. The comparison between the experimental data and theoretical ones shows that there is a big declination when the soluble aluminum content of steel is higher, which is caused by the nonequilibrium reaction of slag and steel. The apparent equilibrium distribution coefficient of titanium between slag and steel is Obtained by use of experimental data.

关键词： BOF bearing steel titanium thermodynamics apparent equilibrium distribution coefficient

Influence of hydrolysis in sulfate process on titania pigment producing

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中国有色金属学会会刊：英文版 2009年第S3期19卷 829-833页

作者：田从学杜剑桥陈新红马维平罗志强程晓哲胡鸿飞刘代俊 panzhihua iron and steel Research institute Pangang Group School of Chemical Engineering Sichuan University

Using industrial titanyl sulfate solution as feedstock, titania white pigment was prepared by self-generated seeded thermal hydrolysis method. The influence of some factors (such as F value, volume ratio of pre-adding water to TiOSO4, heating rate and pH of pre-adding water) on the structure and pigment properties of the as-prepared slurry metatitanic acid and titania samples were studied. The samples were characterized by XRD, particle size distribution, SEM and pigment properties test. The results show that all samples show anatase phase, and the calcined samples prepared under suitable conditions are with narrow particle size distribution and good pigment properties. All these influencing factors have great impacts on the hydrolysis velocity, nucleation rate, crystal growth rate, particle size distribution, crystal structure and pigment properties. The suitable F value is 1.73-1.93, the volume ratio of pre-adding water and TiOSO4 solution is 0.28-1, the optimum heating rate is 0.94-1.33 ℃ /min and pH of the pre-adding water should be at near-neutral range.

关键词： titanyl sulfate hydrolysis F value pre-adding water heating rate

Quality control for bloom casting of YQ450NQR1 steel

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International Journal of Minerals,Metallurgy and Materials 2009年第1期16卷 32-36页

作者： Yong Chen Guo-rong Wu Miao-yong Zhu Materials and Metallurgy School Northeastern University Shenyang 110004 China Department of Material Research Panzhihua Iron and Steel Research Institute Panzhihua 617000 China

To reduce surface depression of a bloom, the primary cooling intensity was decreased, and the water distribution of mold wide and narrow faces was optimized. The length of secondary cooling zones and the specific water flow were increased, and the water flow distribution among the secondary cooling zones was adjusted to eliminate central defects, such as center looseness, central segregation, and center line cracks. The operation showed that the proportion of surface depression decreased from 37.22% to 2.87%, whereas the proportion of center looseness for 〈1.0 increased from 79.71% to 90.70%, the proportion of central segregation for 〈0.5 increased from 1.45% to 44.19%, and the proportion of center line cracks that are free increased from 39.13% to 62.79%. The qualified blooms are delivered to produce 310 Z-beam, whose yield strength is greater than 450 MPa.

关键词： corrosion resistant steel atmospheric corrosion bloom casting primary cooling secondary cooling quality control