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Numerical simulation of slag layer and its distribution on hot surface of copper stave based on ANSYS birth-death element technology

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Journal of Iron and Steel Research International 2021年第5期28卷 507-519页

作者： Quan Shi Jue Tang man-sheng chu School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina Institute for Frontier Technologies of Low-Carbon Steelmaking Northeastern UniversityShenyang 110819LiaoningChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

The core of the long-life copper stave was to ensure the stability of the slag layer,and the uniform distribution of the slag layer was beneficial to restrict the generation of the overthick slag layer.A novel model for calculating the thickness and distribution of the slag layer in the part of copper stave was established based on the finite element theory through the ANSYS birth-death element *** distribution and thickness of the slag layer on the hot surface of copper stave were calculated and analyzed when the gas temperature and slag properties tended to be changed,which was applied to characterize the slag-hanging capability of copper stave with the changes of furnace *** was shown that the thickness of hot surface slag layer in the part of copper stave decreased obviously while the temperature of stave body raised rapidly with increasing gas *** the gas temperature was 1400℃,the inlaid slag layer was gradually melted,and the maximum temperature of the stave body was closed to 120℃.The change of gas temperature was very sensitive to the adherent dross capability of copper stave which would be enhanced by the promotion of slag-hanging ***,when the slag-hanging temperature was 1150℃and the gas temperature was lower than 1250℃,the overlhick slag layer was easily formed on the hot surface of the copper stave,and its stability was *** improvement in the thermal conductivity of slag could be conducive to the formation of the uniform and stable slag layer on the hot surface of copper stave,especially in the dovetail *** the thermal conductivity of the slag was greater than 1.8 W m^(-2)℃^(-1),the inlaid slag layer in the dovetail groove was not melted,although the gas temperature reached 1500℃.

关键词： Copper stave Heat transfer Birth-death element Numerical simulation Slag-hanging capability

Optimized use of MgO flux in the agglomeration of high-chromium vanadium–titanium magnetite

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International Journal of Minerals,Metallurgy and Materials 2015年第4期22卷 371-380页

作者： Jue Tang man-sheng chu Xiang-xin Xue School of Material and Metallurgy Northeastern University

The optimized use of MgO flux in the agglomeration of high-chromium vanadium-titanium magnetite was investigated system- atically through sinter and pellet experiments. MgO was added in the form of magnesite. When the content of MgO in the sinter was in- creased from 1.95wt% to 2.63wt%, the low-temperature reduction degradation index increased from 80.57% to 82.71%. When the content of MgO in the pellet was increased from 1.14wt% to 2.40wt%, the reduction swelling index decreased from 15.2% to 8.6%; however, the com- pressive strength of the oxidized pellet decreased dramatically and it was 1985 N with an MgO content of 1.14wt%. This compressive strength does not satisfy the requirements for blast-furnace production. When all of the aforementioned results were taken into account, the sinter with a high MgO content （2.63wt%） matching the pellet with a low MgO content （less than 1.14wt%） was the rational burden structure for smelting high-chromium vanadium-titanium magnetite in blast furnaces.

关键词： magnetite ore pellets magnesia agglomeration burden sintering

Effects of smelting parameters on the slag/metal separation behaviors of Hongge vanadium-bearing titanomagnetite metallized pellets obtained from the gas-based direct reduction process

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International Journal of Minerals,Metallurgy and Materials 2018年第6期25卷 609-622页

作者： Cong Feng man-sheng chu Jue Tang Zheng-gen Liu School of Metallurgy Northeastern University

Smelting separations of Hongge vanadium-bearing titanomagnetite metallized pellets（HVTMP）prepared by gas-based direct reduction were investigated,and the effects of smelting parameters on the slag/metal separation behaviors were *** mechanisms were elucidated using X-ray diffraction analysis,FACTSAGE 7.0 calculations,and scanning electron microscopy *** results show that,when the smelting temperature,time,and C/O ratio are increased,the recoveries of V and Cr of HVTMP in pig iron are improved,the recovery of Fe initially increases and subsequently decreases,and the recovery of Ti O_2 in slag *** the smelting Ca O/Si O_2 ratio is increased,the recoveries of Fe,V,and Cr in pig iron increase and the recovery of Ti O_2 in slag initially increases and subsequently *** appropriate smelting separation parameters for HVTMP are as follows：smelting temperature of 1873 K;smelting time of 30–50 min;C/O ratio of 1.25;and Ca O/Si O_2 ratio of *** these optimized parameters（smelting time：30 min）,the recoveries of Fe,V,Cr,and Ti O_2 are 99.5%,91.24%,92.41%,and 94.86%,respectively.

关键词： titanomagnetite vanadium chromium metallized pellets smelting separation recovery

Development and progress on hydrogen metallurgy

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International Journal of Minerals,Metallurgy and Materials 2020年第6期27卷 713-723页

作者： Jue Tang man-sheng chu Feng Li Cong Feng Zheng-gen Liu Yu-sheng Zhou School of Ferrous Metallurgy Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

Hydrogen metallurgy is a technology that applies hydrogen instead of carbon as a reduction agent to reduce CO2 emission,and the use of hydrogen is beneficial to promoting the sustainable development of the steel *** metallurgy has numerous applications,such as H2reduction ironmaking in Japan,ULCORED and hydrogen-based steelmaking in Europe;hydrogen flash ironmaking technology in the US;HYBRIT in the Nordics;Midrex H2TM by Midrex Technologies,Inc.(United States);H2FUTURE by Voestalpine(Austria);and SALCOS by Salzgitter AG(Germany).Hydrogen-rich blast furnaces(BFs)with COG injection are common in *** BFs have been industrially tested by AnSteel,XuSteel,and *** a currently under construction pilot plant of a coal gasification–gas-based shaft furnace with an annual output of 10000 t direct reduction iron(DRI),a reducing gas composed of 57 vol%H2 and 38 vol%CO is prepared via the Ende *** life cycle of the coal gasification–gas-based shaft furnace–electric furnace short process(30 wt%DRI+70 wt%scrap)is assessed with 1 t of molten steel as a functional *** plant has a total energy consumption per ton of steel of 263.67 kg standard coal and a CO2 emission per ton of steel of 829.89 kg,which are superior to those of a traditional BF converter *** domestic materials and fuels,hydrogen production and storage,and hydrogen reduction characteristics,we believe that a hydrogen-rich shaft furnace will be suitable in *** production and storage with an economic and large-scale industrialization will promote the further development of a full hydrogen shaft furnace.

关键词： hydrogen hydrogen metallurgy blast furnace shaft furnace low carbon

Reduction behavior and mechanism of Hongge vanadium titanomagnetite pellets by gas mixture of H2 and CO

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Journal of Iron and Steel Research International 2017年第1期24卷 34-42页

作者： Wei Li Gui-qin Fu man-sheng chu Miao-yong Zhu School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

Hongge vanadium titanomagnetite（HVTM）pellets were reduced by H2-CO gas mixture for simulating the reduction processes of Midrex and HYL-III shaft *** influences of reduction temperature,ratio ofφ（H2）toφ（CO）,and pellet size on the reduction of HVTM pellets were evaluated in detail and the reduction reaction kinetics was *** results show that both the reduction degree and reduction rate can be improved with increasing the reduction temperature and the H2 content as well as decreasing the pellet *** rational reduction parameters are reduction temperature of 1050℃,ratio ofφ（H2）toφ（CO）of 2.5,and pellet diameter in the range of 8-11 *** these conditions（pellet diameter of 11mm）,final reduction degree of 95.51% is *** X-ray diffraction（XRD）pattern shows that the main phases of final reduced pellets under these conditions（pellet diameter of 11 mm）are reduced iron and *** peak intensity of reduced iron increases obviously with the increase in the reduction ***,relatively high reduction temperature promotes the migration and coarsening of metallic iron particles and improves the distribution of vanadium and chromium in the reduced iron,which is conducive to subsequent melting *** the early stage,the reduction process is controlled by interfacial chemical reaction and the apparent activation energy is 60.78kJ/*** reduction process is controlled by both interfacial chemical reaction and internal diffusion at the final stage,and the apparent activation energy is 30.54kJ/mol.

关键词： Hongge vanadium titanomagnetite Pellet Gas-based direct reduction Behavior and mechanism Kinetics

Effect of basicity on metallurgical properties of magnesium fluxed pellets

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Journal of Iron and Steel Research International 2020年第3期27卷 239-247页

作者： Jie Li Hai-fei An Wei-xing Liu Ai-min Yang man-sheng chu College of Metallurgy and Energy North China University of Science and TechnologyTangshan 063000.HebeiChina Hebei Key Laboratory of Data Science and Applications North China University of Science and TechnologyTangshan 063000HebeiChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

Magnesium fluxed pellets are the focus of blast furnace burden research for reducing environmental *** pelletizing,roasting and metallurgical properties of a Chinese fine magnetite ore with the addition of magnesium flux were experimentally tested,and the effects of basicity on the consolidation behavior,compressive strength,and reducibility of magnesium fluxed pellets were systematically ***,the mechanisms were analyzed by means of thermodynamics calculation and scanning electron microscopy-energy-dispersive spectrometry analysis *** results show that the consolidation behavior of magnesium fluxed pellets during roasting process was obviously promoted with increasing the basicity of the magnesium fluxed *** compressive strength increased firstly and then decreased,reaching the maximum value of 2352 N/pellet with the basicity of *** reduction degree increased gradually with enhancing the basicity owing to the fact that the decomposition of the added CaCO^could increase the porosity of pellets,thereby increasing the CO diffusion in pellet during ***,the reduction swelling index was improved with increasing the basicity because the generated calcium feirite could effectively suppress the growth of iron whiskers.

关键词： Magnesium fluxed pellet Basicity Compressive strength Reduction degree Reduction swelling

Effect of Cr_2O_3 addition on the oxidation induration mechanism of Hongge vanadium titanomagnetite pellets

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International Journal of Minerals,Metallurgy and Materials 2018年第4期25卷 391-398页

作者： Wei Li Nan Wang Gui-qin Fu man-sheng chu Miao-yong Zhu School of Metallurgy Northeastern University

As part of a research project to develop a novel clean smelting process for the comprehensive utilization of Hongge vanadium titanomagnetite（HVTM）, in this study, the effect of Cr2O3 addition on the oxidation induration mechanism of HVTM pellets（HVTMPs） was investigated in detail. The results showed that the compressive strength of the HVTMPs was greatly weakened by the Cr2O3 addition, mainly because of a substantial increase in the porosity of the HVTMPs. The Cr2O3 addition marginally affected the phase composition but greatly affected the microstructural changes of the HVTMPs. Increased amounts of Cr2O3 resulted in a decrease in the uniform distribution of the hematite grains and in an increase in the Fe–Cr solid solutions（Fe1.2Cr0.8O3 and Fe0.7Cr1.3O3） embedded in the hematite grains. Moreover, the compact hematite was destroyed by forming a dispersed structure and the hematite recrystallization was hindered during the oxidation induration, which adversely affected the compressive strength. On the basis of these results, a schematic was formulated to describe the oxidation induration mechanism with different amounts of added Cr2O3. This study provides theoretical and technical foundations for the effective production of HVTMPs and a reference for chromium-bearing minerals.

关键词： chromium Hongge vanadium titanomagnetite porosity oxidation induration microstructure

Effects of MgO/Al_(2)O_(3)and CaO/SiO_(2)ratios on viscosity of high titaniumbearing blast furnace slag

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Journal of Iron and Steel Research International 2023年第3期30卷 456-464页

作者： Hua-bin Gao Jue Tang man-sheng chu Shu-yu Zhong Zheng-gen Liu School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina Liaoning Province Engineering Research Center for Technologies of Low-Carbon Steelmaking Northeastern UniversityShenyang 110819LiaoningChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

The effects of MgO/Al_(2)O_(3)and CaO/SiO_(2)ratios on the viscosity,break-point temperature,and viscous activation energy of a high titanium-bearing slag were *** results showed that both the viscosity and the break-point temperature of the slag decreased with the MgO/Al_(2)O_(3)ratio increasing from 0.50 to 0.65,the viscous activation energy decreased gradually,and the thermal stability became *** addition,with an increase in CaO/SiO_(2)ratio from 1.12 to 1.22,the main viscous units in the slag depolymerized and the viscosity of slag ***,the break-point temperature of slag showed an increasing *** viscous activation energy decreased gradually and the thermal stability became *** basic phase in the experimental high titanium-bearing slag was pyroxene,and its amount increased with increasing the MgO/Al_(2)O_(3)ratio while decreased with increasing the CaO/SiO_(2)ratio.

关键词： High titanium-bearing slag Viscosity Viscous activation energy Break-point temperature Phase composition

Softening–melting–dripping characteristics and evolution mechanism of vanadium-bearing titanomagnetite carbon composite briquette used as novel blast furnace burden

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Journal of Iron and Steel Research International 2021年第9期28卷 1082-1094页

作者： Wei Zhao man-sheng chu Hong-wei Guo Zheng-gen Liu Bing-ji Yan School of Iron and Steel Soochow UniversitySuzhou215137JiangsuChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina

Vanadium-bearing titanomagnetite carbon composite briquette(VTM-CCB)was proposed as an innovative and promising blast furnace burden to realize low-carbon and high-efficiency *** optimize the compositions of VTM-CCB based on its softening–melting–dripping characteristics,the evolution behavior and mechanisms of VTM-CCB in cohesive zone and dripping zone were investigated by conducting softening–melting tests under blast furnace *** results show that the structure evolution of VTM-CCB in softening–melting process is correlated to the molten slag,metallic iron,liquid iron,and residual *** the molar ratio of the fixed carbon to the reducible oxygen in iron oxides(FC/O ratio)ranging from 0.8 to 1.0,the VTM-CCB tends to form dense structure and accelerate the softening and *** increasing the FC/O ratio to 1.2 and 1.4,the VTM-CCB tends to form concentric circular structure,which could suppress the collapse of packed bed,shift down the location of core cohesive zone,and improve the gas *** the appropriate increase in FC/O ratio could improve the softening–melting performance of VTM-CCB,a higher FC/O ratio could also promote the precipitation of Ti(C,N),thereby thickening the molten mixtures and deteriorating the dripping *** considering the softening–melting–dripping characteristics and permeability,the appropriate FC/O ratio of VTM-CCB should be controlled in the range of 1.0–1.2.

关键词： Vanadium-bearing titanomagnetite carbon composite briquette FC/O ratio Softening-melting-dripping characteristic Ti(C,N) Blast furnace