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Effects of Na_(2)CO_(3)on reduction mechanism and kinetics of iron during deep reduction of ilmenite concentrate

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Journal of Iron and Steel Research International 2023年第3期30卷 419-428页

作者： Xiao-dong lv You-ling Hou Yun-tao Xin wei lv xue-wei lv Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

High-quality upgraded titanium slag obtained through semi-molten reduction with the addition of Na_(2)CO_(3)is important for the fluidizing chlorination process to produce TiO_(2)*** key is the effect of Na_(2)CO_(3)on the reduction behavior of ***,the effects of Na_(2)CO_(3)on reduction mechanism and kinetics of iron during deep reduction of ilmenite concentrate were *** results indicated that the metallization ratio of the reduced sample increased with increasing temperature,time,and dose of Na_(2)CO_(3).The addition of Na_(2)CO_(3)significantly accelerated the reduction of iron in the ilmenite concentrate and promoted the growth of iron ***,the addition of Na_(2)CO_(3)produced sodium iron titanates;thus,the metallization ratio of the sample decreased with an increase in the temperature and time when the temperature was above 1200℃and the time was more than 30 *** the doses of Na_(2)CO_(3)were 0,3,and 6 wt.%,the reduction of iron was controlled by the interfacial chemical reaction,both the interfacial chemical reaction and diffusion,and diffusion,respectively,and the apparent activation energies were 134.91,64.89,and 120.82 kJ/mol,respectively.

关键词： Ilmenite concentrate Sodium carbonate Metallization ratio Reduction mechanism Kinetics

Effect of pre-oxidation degree on gaseous reduction of pre-oxidized ilmenite concentrate by CO

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Journal of Iron and Steel Research International 2022年第6期29卷 881-890页

作者： Shi-qing Zhao Xiao-dong lv Zhi-ming Yan xue-wei lv wei lv Chen-guang Bai College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Advanced Manufacturing&Materials Centre University of WarwickCoventry CV47ALUK School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

The effect of pre-oxidation degree of Panzhihua ilmenite concentrate on the gaseous reduction by carbon monoxide was *** raw ilmenite concentrates were pre-oxidized at 600,700,800,900,and 1000°C for 2 h,*** phase change,FeO content,and morphology after the oxidation at various temperatures were *** oxidation degree was calculated according to the change of FeO *** was performed on the oxidized ilmenite concentrate samples(oxidized at 600,800,and 1000°C)at 850,900,and 950°C,*** results show that the pre-oxidation of ilmenite concentrate can accelerate the reduction process:the higher pre-oxidation degree,the faster reduction *** high pre-oxidation degree of ilmenite concentrate is beneficial to accelerate the subsequent reduction process in two *** stages of the reduction process were divided via the first derivatives of reduction degree,and the reduction mechanism and apparent activation energy were discussed subsequently.

关键词： Ilmenite Pre-oxidation Reduction Kinetic Titanium slag

Optimization of preparation process of high-strength pellets from Panzhihua ilmenite concentrate

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Journal of Iron and Steel Research International 2023年第12期30卷 2391-2402页

作者： Gang-wei Zhou wei lv Fu-rong Chen Zheng-gen Liu Man-sheng Chu xue-wei lv School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina College of Materials Science and Engineering Chongqing UniversityChongqing400044China

The preparation of high-strength pellets from Panzhihua ilmenite concentrate is important for the hydrogen-rich smelting of titania slag and was *** effects of the magnetite concentrate and heating procedure including the pre-heating temperature and period as well as roasting temperature and period on the compressive strength of the roasted pellets were ***-strength ilmenite concentrate pellets(>2000 N)were prepared by optimizing the roasting *** addition of magnetite concentrate is beneficial for increasing the compressive strength of the Panzhihua ilmenite concentrate pellet by oxidizing hematite which filled the pseudobrookite particles,functioned as a bridge bond,and improved the interconnection between the *** compressive strength can reach up to 2900 N when the ilmenite concentrate pellet with 15%magnetite concentrate is pre-heated above 800℃ for 20 min and then roasted at 1250℃ for 20 *** addition,there is an overall upward trend in the compressive strength with an increase in the pre-heating temperature and period as well as the roasting temperature and *** micromorphology and strengthening consolidation mechanism of Panzhihua ilmenite concentrate pellets were also discussed.

关键词： Ilmenite concentrate Pelletizing Roasting Compressive strength-Pellet

Physicochemical properties and structure of titania-containing metallurgical slags: a review

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Journal of Iron and Steel Research International 2022年第2期29卷 187-206页

作者： Zhi-ming Yan xue-wei lv Zu-shu Li WMG University of WarwickCoventryCV47ALUK School of Materials Science and Engineering Chongqing UniversityChongqing400044China

The titanium industry can hardly bypass the titania-containing slags,and the slag physicochemical properties are essential in the metallurgical reactor design and process *** TiO_(2)–FeO-based slags and TiO_(2)–SiO_(2)–CaO-based slags are the main metallurgical slag systems in the titanium resource utilization *** elaborate the role of TiO_(2) in the physicochemical properties of titania-containing metallurgical slags,the physicochemical properties including titanium redox ratio,liquidus temperature,viscosity,electrical conductivity,density,surface tension,thermal conductivity,and sulfide capacity were critically ***,the property prediction models were briefly introduced with regards to the limitations of the existing *** property prediction models are still required to evolve since not all properties of titania-containing slags can be well *** the slag structure has an intimate relationship with slag properties,the structural details of the titania-containing slag were investigated by using a combination of spectroscopic technologies,but the knowledge of the slag structure was not fully *** potential research fields related to the physicochemical properties and structure of the titania-containing slags were also suggested.

关键词： Titania-containing slag Physicochemical property Prediction model Slag structure

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

Effect of TiO2 on reduction behavior of Cr2O3 in CaO-SiO2-Al2O3-MgO-TiO2-Cr2O3 by carbon from Fe-C melt

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Journal of Iron and Steel Research International 2020年第10期27卷 1145-1152页

作者： Jun-yi Xiang Gui-shang Pei wei lv Bao-hua Li Gui-bao Qiu xue-wei lv College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials Chongqing UniversityChongqing 400044China

The chromium-bearing titanomagnetite ore will turn to be the important raw material for blast furnace process in Panxi area,*** reduction behavior of Cr2O3 between CaO-SiO2-Al2O3-TiO2-Cr2O3 and Fe-C systems was *** effect of TiO2 content in the slag system on the reduction of Cr2O3,TiO2,and SiO2 and the con sumption of C in hot metal was investigated by both theoretical calculation and physical *** theoretical calculation results reveal that higher reduction temperature promotes the reduction of Cr and Ti,while high basicity and TiO2 content have little influence on the reduction of chromium but significantly influence the reduction of *** smelting reduction experiment results show that the content of Cr in hot metal significantly in creases with extendi ng the reduction time and decreases with the increase in TiO2 ***,the content of Ti in hot metal significantly increases as the TiO2 increases,reaching 0.073,0.085,0.107,and 0.121 wt.%for 5,10,15,and 20 wt.%of TiO2 input,*** studies proved that the reduction of Cr2O3 was a first-order *** addition of TiO2 inhibited the reduction of Cr2O3 and resulted in the decrease in reaction rate constant.

关键词： Smelting reduction Titanomagnetite Blast furnace slag Chromium oxide Titanium oxide

Special issue on resources recycling of solid wastes from ironmaking and steelmaking

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Journal of Iron and Steel Research International 2023年第7期30卷 1301-1302页

作者： xue-wei lv Hong-ming Long Run Huang College of Materials Science and Engineering Chongqing UniversityChongqing 400030China College of Metallurgical Engineering Anhui University of TechnologyHefei 243099AnhuiChina College of Materials and Metallurgy Guizhou UniversityGuiyang 550025GuizhouChina

Driven by the double carbon policy,the iron and steel industry urgently needs to implement a new development concept to strengthen the use of solid waste resources from ironmaking and steelmaking and effectively enhance the economic benefits of recycling resources in order to reduce the accumulation of solid waste resources in the iron and steel *** iron and steel production process produces more than 600 million tons of solid waste annually,including metallurgical dust sludge,blast furnace slag and steel slag,*** the perspective of environmental friendliness,the efficient utilization of ironmaking and steelmaking solid waste resources through innovative cross-industry technologies is of great significance to the low-carbon,green and high-quality development goals of the iron and steel industry.

关键词： steel solid annually

Ferrosilicon alloy granules prepared through centrifugal granulation process

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Journal of Iron and Steel Research International 2020年第11期27卷 1247-1258页

作者： Wen-chao He xue-wei lv Zhi-ming Yan Gang-qiang Fan Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing 400044China

A novel granulation process that involved the use of a rotary multi-nozzles cup atomizer and water cooling was proposed for ferroalloy *** effects of rotating speed and nozzle diameter on the properties of FeSi75 alloy(containing 75 wt.%Si)granules were *** indicated that median granule diameter decreased as rotating speed in creased,and initially increased and then decreased as nozzle diameter in *** optimal conditi ons for the gra nulation of FeSi75 alloy were a rotating speed of 150 r/min and nozzle diameter of 10 or 12 *** phase composition,micromorphology,and elemental distribution of the FeSi75 alloy granules were also studied by X-ray diffraction,scanning electron microscopy,and energy-dispersive X-ray *** order to provide guidance for the layout and water depth of the tank,the solidification behavior of ferrosilicon alloy droplet was numerically studied.A simplified model was established to elucidate the traveling trajectory and heat transfer of alloy droplet in air and cooling water during the atomization *** solidification time of droplet with different thicknesses of solidification layer increased with the in crease in alloy droplet diameter.

关键词： FeSi75 alloy Rotary multi-nozzles cup atomizer Size distribution Microstructural analysis Solidification behavior

Reduction kinetics of MgO-doped calcium ferrites under CO-N2 atmosphere

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Journal of Iron and Steel Research International 2019年第12期26卷 1265-1272页

作者： Tian-xiong Wang Cheng-yi Ding xue-wei lv Sen-wei Xuan Gang Li Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China School of Materials Science and Engineering Chongqing UniversityChongqing 400044China

The effect of magnesia on calcium ferrite(***2O3)reduction by CO was examined by isothermal *** of calcium ferrite added with 0,2,4,and 8 wt.%magnesia(abbreviated as CF,CF2M,CF4M,and CF8M)were *** composition was analyzed by X-ray diffraction,and the results indicated that CF2M and CF4M are reduced to lower reduction degree and with lower apparent activation energy than CF;and CF8M with more ***2O3 is reduced to a lower degree and with more difficulty compared with *** rate analysis revealed that CF,CF2M,CF4M,and CF8M reductions are all typical two-step reactions with the order of CF→CWF(***2O3)→*** apparent reduction activation energies of CF,CF2M,CF4M,and CF8M are 46.89,37.30,17.30,and 29.20 kJ/mol,*** analysis depicted that CF2M,CF4M,and CF8M reductions are all described by 2D Avrami–Erofeev(A–E)equation(A2)in the whole process,while CF reduction is first expressed by A2 and then by 3D A–E equation(A3).Different from shrinking core model,a new kinetic model for powdery samples reduction was proposed to illustrate the relationship among reduction rates,reduction routes,and model functions.

关键词： Calcium ferrite Magnesia Reduction kinetics Reduction model