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Primary slag formation behavior during reduction process of SFCA-I and SFCA

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Journal of Iron and Steel Research International 2022年第11期29卷 1748-1759页

作者： Fan-jian Meng Chang-yu Sun Ting-le Li Qi Wang State key laboratory of Advanced Metallurgy and School of metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China The key laboratory of Chemical Metallurgy Engineering of liaoning Province and School of materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina

Because the formation behavior of primary slag which decomposed from complex calcium ferrite(SFCA-I and SFCA)is not quite clear,the migration behavior of CaO and Al_(2)O_(3) derived from high basicity or high alumina sinter is always worth *** reducibility of three representative sinter samples and the formation behavior of primary slag during reduction process were investigated via X-ray diffraction,scanning electron microscopy,and energy-dispersive spectroscopy *** results show that the reducibility of high basicity sinter is superior to that of high alumina *** with poor reducibility like hercynite and brownmillerite and with large-grained particles like free alumina and silica form in sinters with basicity of 2.4 and Al_(2)O_(3) content of 4 wt.%,*** appearance of these minerals can well explain the reduction stagnation phenomenon occurring in these sinter *** migration behavior of CaO and Al_(2)O_(3) during slag formation process is *** can easily combine with SiO2 to form silicate phase or firstly form calcium-rich ferro-aluminate solid solution and then transform to silicate phase,while Al_(2)O_(3) firstly combines with CaO and FeO to form solid solution and then,gradually combines with SiO2 to form calcium aluminum silicate phase.

关键词： Primary slag formation behavior Complex calcium ferrite High basicity sinter High alumina sinter Reducibility

Extracting reaction mechanism analysis of Zn and Si from zinc oxide ore by NaOH roasting method

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Journal of Central South University 2017年第10期24卷 2266-2274页

作者： CHEN Bing SHEN Xiao-yi GU Hui-min SHAO Hong-mei ZHAI Yu-chun MA Pei-hua School of Metallurgy Northeastern UniversityShenyang 110819China Science and technology laboratory Academy of Environmental SciencesPanjin 124010China liaoning key laboratory for metallurgical sensor and technology Northeastern UniversityShenyang 110819China

The orthogonal test was used to optimize the reaction conditions of roasting zinc oxide ore with NaOH aiming to comprehensively utilize zinc oxide *** optimized reaction conditions were molar ratio of NaOH to zinc oxide ore 6:1,roasting temperature 450°C,holding time 150 *** molar ratio of NaOH to zinc oxide ore was the most predominant factor affecting the extraction ratios of zinc oxide and *** mineral phase transformations were investigated by testing the phases of specimens obtained at different *** process was that silica reacted with molten NaOH to form Na_2SiO_3 at first,then transformed into Na_4SiO_4 with temperature ***_3 and its decomposing product ZnO reacted with NaOH to form Na_2ZnO_***_2ZnSiO_4was also *** reaction rate was investigated using unreacted shrinking core *** models used were chemical reaction at the particle surface and diffusion through the product *** results indicated that the reaction rate was combine-controlled by two *** activation energy and frequency factor were obtained as 24.12 k J/mol and 0.0682,respectively.

关键词： zinc oxide ore NaOH roasting method reaction process reaction mechanism kinetics

Influence of Coke Content on Sintering Process of Chromium-containing Vanadium-titanium Magnetite

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Journal of Wuhan University of technology(materials Science) 2018年第1期33卷 68-72页

作者：周密杨松陶 JIANG Tao XUE Xiangxin School of Metallurgy Northeastern University key laboratory of liaoning Province for Recycling Science of metallurgical Resources School of materials and Metallurgy University of Science and Technology Liaoning

The sintering of chromium-containing vanadium-titanium magnetite using different coke contents was studied through the sintering pot tests, X-ray diffraction analysis and mineralogical phase analysis. Results showed that, as the coke content increased from 3.2% to 4.4%, the liquid phase and combustion zone thickness increased while the vertical sintering rate and ratio of sintered product decreased. In addition, the combustion ratio of exhaust gas also increased with increasing the coke content, indicating that combustion zone temperature also increased, and the excessive the coke content in the sintering process of vanadiumtitanium magnetite is harmful. As the coke content increased, the magnetite, silicates, and perovskite contents of the sintered ore increased while the contents of hematite and calcium ferrite of sintered ore decreased; drum strength decreased, and reduction degradation properties increased while reduction ability decreased. We found that the appropriate coke content for the sintering process is 3.6 wt%.

关键词： chromium-containing vanadium-titanium magnetite sintered ore coke content mineralogical phases

Flow field, heat transfer and inclusion behavior in a round bloom mold under effect of a swirling flow submerged entry nozzle

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Journal of Iron and Steel Research International 2023年第6期30卷 1211-1221页

作者： Qing-hua Xie Pei-yuan Ni Toshihiro Tanaka Mikael Ersson Ying Li key laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education School of MetallurgyNortheastern UniversityShenyang 110819LiaoningChina liaoning key laboratory of metallurgical sensor materials and technology School of MetallurgyNortheastern UniversityShenyang 110819LiaoningChina Graduate School of Engineering Osaka UniversityOsaka 565-0871Japan Department of materials Science and Engineering KTH Royal Institute of TechnologyStockholm 10044Sweden

Flow field,heat transfer and inclusion behavior in a 700 mm round bloom mold under the effect of a swirling flow submerged entry nozzle(SEN)were investigated with the aim to enhance the casting *** results indicate that the impinging flow phenomenon,which is commonly observed in conventional single-port SEN casting,was completely suppressed by the swirling flow SEN coming from a novel swirling flow generator design in *** from the SEN port moved towards the mold wall in 360 direction,leading to a uniform temperature distribution in the *** to a conventional single-port SEN casting,the steel super-heat was decreased by about 5 K at the mold center,and the temperature was increased by around 3.5 K near the *** addition,the removal ratio of inclusions to the mold top surface in the swirling flow SEN casting was found to be ***,the removal ratio of spherical inclusions with diameters of 1,10,50 and 100μm was increased by 18.2%,18.5%,22.6% and 42.7%,***,the ratio was raised by 18.2%,20.8%,21.5% and 44.1%for non-spherical inclusions,respectively.

关键词： Large round bloom Swirling flow submerged entry nozzle casting Flow field Heat transfer Inclusion behavior

Effect of chemical reactions between electrolyte and lithium compounds on the electrochemical performance of the ceramic fuel cells

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Carbon Resources Conversion 2022年第2期5卷 131-138页

作者： Ruixin Dai Gang Chen Kai Wei Zhuo Chen Xiaohong Lv Guoqiang Liu Ying Li Shujiang Geng School of Metallurgy Northeastern UniversityShenyang 110819China liaoning key laboratory for metallurgical sensor and technology Northeastern UniversityShenyang 110819China

Previous studies have found that the ceramic fuel cell using Ni_(0.8)Co_(0.15)Al_(0.05)LiO_(2)(NCAL)symmetrical electrode has obtained very good power generation performance in the temperature range of 450 to 550℃.Previous studies have pointed out that after being reduced by H2,NCAL anode will produce LiOH/Li2CO3 mixture and diffuse into the electrolyte,which results in the high ionic conductivity of the *** this study,the chemical reactivity of different oxide electrolytes such as CeO_(2),TiO_(2),ZrO_(2)and YSZ with LiOH and/or Li2CO3 and their effects on the electrochemical performance of the cell were *** is found that at 550◦C,only the open circuit voltage(OCV)of the cell using CeO_(2)as electrolyte can remain stable,and the maximum power density(MPD)of the CeO_(2)electrolyte cell reaches 599.6 mW⋅cm^(−2).The OCV of the cells with TiO_(2),ZrO_(2)and YSZ as electrolyte increased to the highest value within a few minutes,and the MPD of the cells was only more than 12 mW⋅cm^(−2).XRD,FT-IR,SEM-EDS and ICP-OES results indicate that the LiOH/Li2CO3 mixture diffuses into TiO_(2),ZrO_(2)and YSZ electrolytes and reacts with three oxides to produce Li2TiO3 and Li2ZrO3,respectively,which results in the low performance of the cell.

关键词： Ceramic fuel cell with lithium compounds electrode Ni_(0.8)Co_(0.15)Al_(0.05)LiO_(2) LiOH Chemical reaction Electrochemical performance

Performance degradation mechanism of lithium compounds ceramic fuel cell with GDC as electrolyte

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Carbon Resources Conversion 2023年第3期6卷 238-244页

作者： Kai Wei Rui Zhang Gang Chen Zhuo Chen Ruixin Dai Xiaohong Lv Shujiang Geng School of Metallurgy Northeastern UniversityShenyang 110819China liaoning key laboratory for metallurgical sensor and technology Northeastern UniversityShenyang 110819China

The performance degradation mechanism of ceramic fuel cell with NCAL(Ni_(0.8)Co_(0.15)Al_(0.05)LiO_(2))as symmetrical electrode and GDC as electrolyte in H2 is *** is found that under the condition of 550◦C and constant current density of 0.2 A⋅cm^(-2),the output voltage of the cell is about 1.005 V in the initial 10 h and remains relatively *** 10 h,the voltage of the cell began to decrease gradually,and by 50 h,the voltage had decreased to 0.522 *** results testing electrochemical performance of the cell and characterizing the cell materials before and after test using SEM,TOF-SIMS and FTIR indicate that the distribution of Li_(2)O/LiOH/Li_(2)CO_(3)compounds generated from NCAL anode in the cell plays a vital role in significantly improving the ionic conductivity of electrolyte and gas tightness of the *** dynamic migration of molten salt destroyed the continuity of molten salt in the cell,which in turn adversely impacted the ionic conductivity of electrolyte,gas tightness of the cell,and electrochemical reactions on both sides of the cathode and *** finally lead to the degradation of the cell performance.

关键词： Ceramic fuel cell Ni_(0.8)Co_(0.15)Al_(0.05)LiO_(2) Degradation mechanism Lithium compound molten salt Dynamic migration

Solvothermal synthesis and adsorption performance of layered boehmite using aluminum chloride and high-alumina fly ash

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Chinese Journal of Chemical Engineering 2024年第6期70卷 280-290页

作者： Jing Wen Ruirui Yuan Tao Jiang Tangxia Yu Yufan Zhang School of Metallurgy Northeastern UniversityShenyang 110819China key laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China liaoning key laboratory for metallurgical sensor and technology Shenyang 110819China

High alumina fly ash(FAHAl)is a kind of bulk solid waste unique to China,whose availability of high-value aluminum and the threat to the environment makes its high-value utilization *** this work,the alumina containing leaching solution obtained from Na_(2)CO_(3) roasting and HCl leaching of FAHAl was used as the mother liquor to prepare layered boehmite in *** preparation process with AlCl_(3) as the raw material was also *** formation process and mechanism of boehmite,the choice of solvent,along with the adsorption capability of Congo red were analyzed by X-ray diffraction,scanning electron microscopy,Fourier transform infrared spectroscopy,Brunauer-Emmett-Teller method and adsorption *** showed that during the preparation of layered boehmite,the precursor Al(OH)_(3) from the reaction of Al^(3+) and OH-is transformed into boehmiteγ-*** existence of ethanol is beneficial to regulate and promote the growth of boehmite crystal *** water and ethanol are mixed with a volume ratio of 2:1 and used as the solvent,the maximum specific surface area of the boehmite is obtained at 135.7 m^(2)·g^(-1),and 99.16%of Congo red can be absorbed after 10 min when AlCl3 is used as a raw *** purified leaching solution is used as the mother liquid,the crystallinity of boehmite decreases slightly when the pH value decreases from 12.5 to *** pH is 11,the removal efficiency of Congo red reaches a maximum of 72.25%.This process not only achieves the extraction of aluminum and high-value utilization of FAHAl but also provides a thought to prepare layered boehmite with adsorption properties.

关键词： High-alumina fly ash Layered boehmite In-situ preparation Solvothermal synthesis Adsorption High-value utilization

Comparison of the interface reaction behaviors of CaO–V_(2)O_(5) and MnO_(2)–V_(2)O_(5) solid-state systems based on the diffusion couple method

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International Journal of Minerals,Metallurgy and materials 2023年第5期30卷 834-843页

作者： Jing Wen Hongyan Sun Tao Jiang Bojian Chen Fangfang Li Mengxia Liu School of Metallurgy Northeastern UniversityShenyang 110819China key laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China liaoning key laboratory for metallurgical sensor and technology Shenyang 110819China

The formation mechanism of calcium vanadate and manganese vanadate and the difference between calcium and manganese in the reaction with vanadium are basic issues in the calcification roasting and manganese roasting process with vanadium *** this work,CaO–V_(2)O_(5) and MnO_(2)–V_(2)O_(5) diffusion couples were prepared and roasted for different time periods to illustrate and compare the diffusion reaction ***,the changes in the diffusion product and diffusion coefficient were investigated and calculated based on scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS) *** show that with the extension of the roasting time,the diffusion reaction gradually proceeds among the CaO–V_(2)O_(5) and MnO_(2)–V_(2)O_(5) diffusion *** regional boundaries of calcium and vanadium are easily identifiable for the CaO–V_(2)O_(5) diffusion ***,for the MnO_(2)–V_(2)O_(5) diffusion couple,MnO_(2) gradually decomposes to form Mn_(2)O_(3),and vanadium diffuses into the interior of Mn_(2)O_(3).Only a part of vanadium combines with manganese to form the diffusion production ***_(2)O_(6) and MnV_(2)O_(6) are the interfacial reaction products of the CaO–V_(2)O_(5) and MnO_(2)–V_(2)O_(5) diffusion couples,respectively,whose thicknesses are 39.85 and 32.13μm when roasted for 16 *** 16 h,both diffusion couples reach the reaction equilibrium due to the limitation of *** diffusion coefficient of the CaO–V_(2)O_(5) diffusion couple is higher than that of the MnO_(2)–V_(2)O_(5) diffusion couple for the same roasting time,and the diffusion reaction between vanadium and calcium is easier than that between vanadium and manganese.

关键词： solid-state reaction reaction regularity of calcium and vanadium reaction regularity of manganese and vanadium diffusion couple method interface reaction behavior

Bainite Transformation of Low-carbon and Boron-containing Steel under Continuous Cooling

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Journal of Iron and Steel Research International 2014年第3期21卷 359-363页

作者： Zhi-hong ZHANG Xiang-xin XUE Institute of metallurgical Resources and Environmental Engineering Northeastern University liaoning key laboratory of metallurgical Resources Circulation Science liaoning Engineering technology Research Center of Comprehensive Utilization of Boron Resources liaoning University key Laboratories of Ecological Utilization technology of Boron Resources and Boron materials

The effects of deformation temperature and strain on bainite transformation of low carbon steel and boron- containing steel were investigated under continuous cooling conditions by means of dilatometric measurement and mi- crostructure observation. The results show that with decreasing the deformation temperature from 1000 to 800 ℃ and increasing strains, bainite start temperature for boron-containing low carbon steel increases, whereas it decreases for low carbon steel under the same condition. The bainite microstructures are easily obtained for boron-containing steel deformed at different temperatures and different strains compared with plain low carbon steel. With increasing the continuous cooling rate, the bainite start temperature under deformed condition is about 20 ℃ higher than that under undeformed condition for boron-containing steel, but it changes slightly when the cooling rate is 20 ℃/s or more.

关键词： bainite start temperature boron containing steel phase transformation bainite