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Green, sustainable and massive synthesis of sodium vanadate nanowires toward industrialization

Progress in Natural Science:Materials International 2023年第6期33卷 918-923页

作者： Wei Ni State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization ANSTEEL Research Institute of Vanadium & Titanium (Iron & Steel)

One-dimensional(1D) layered materials combine the advantages of layered materials and 1D nanomaterials,which has attracted intense interest not only in the academic research but also in the industrial *** sodium vanadate nanowires have received incremental attention due to the high capacity and enhanced electrical conductivity for promising advanced energy storage and conversion. However, the mass production of these 1D layered vanadium vanadates(1D NVO) are still of great challenge and the further scalable application in energy storage and conversion systems are hampered. Herein, we developed a facile, non-hydrothermal, green synthesis strategy for scalable, mass production of layered vanadium vanadate nanowires and their assemblies such as membranes, blocks, grains, powders toward industrial scale. It will pave a way for the industrial production of 1D inorganic materials and give a new insight into the fabrication of nanostructured materials beyond commercialized 1D/2D nanomaterials including carbon nanotubes(CNT) and layered double hydroxides(LDH).

关键词： Sodium vanadate nanowires Mass production vanadium-based Barnesite 1D nanomaterials Self-assembly Nanowire membrane Green synthesis

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Causes of surface stripe cracks of Ti–4Al–2V alloy cold-rolled sheet

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Rare Metals 2014年第5期33卷 522-526页

作者： De-Ming Huang Xiong-Fei Yang Qing-Feng Wei Yong Chen Hua Guo Sheng-Long Liang Ying Wang Pangang Group Research Institute Co. Ltd. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization

The stripe cracks which formed along rolling direction on the surface of Ti–4Al–2V alloy cold-rolled sheet were observed by stereoscope, scanning electron microscope（SEM）, and energy-dispersive spectrometer（EDS）. Morphology analysis indicates that cracks are dominantly in zigzag shape, with 10–30 mm in length and less than 10 lm in depth, and there is no evidence of crack tips. Chemical composition analysis shows that crack regions feather high oxygen concentration while smooth surface is at normal oxygen level. It is obvious that the occurrence of strip cracks is mainly related to residual oxide on the surface of Ti–4Al–2V alloy cold-rolled sheet.

关键词： Ti-4Al-2V Cold-rolled sheet Surface Stripe cracks

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Chemical dehydration coupling multi-effect evaporation to treat waste sulfuric acid in titanium dioxide production process

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Chinese Journal of Chemical Engineering 2020年第4期28卷 1162-1170页

作者： Hongyin Pang Ruifang Lu Tao Zhang Li Lü Yanxiao Chen Shengwei Tang State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000China School of Chemical Engineering Sichuan UniversityChengdu 610065China

In order to concentrate the diluted sulfuric acid from the titanium dioxide(TiO2)production of sulphate process,a new concentration process was proposed by coupling chemical dehydration and multi-effect *** ferrous sulfate monohydrate(FeSO4·H2O),as the dehydrant,was added to the diluted sulfuric acid to form ferrous sulfate heptahydrate(FeSO4·7H2O)according to the H2SO4-FeSO4-H2O phase diagrams,which partially removes the *** process was named as Chemical Dehydration *** residual water was further removed by two-effect evaporation and finally 70 wt%sulfuric acid was *** FeSO4·H2O can be regenerated through drying and dehydration of FeSO4·*** results show that FeSO4·H2O is the most suitable dehydrant,the optimal reaction time of chemical dehydration process is 30 min,and low temperature is favorable for the dehydration reaction.45.17%of the entire removed water can be removed by chemical dehydration from the diluted sulfuric *** chemical dehydration process is also energy efficient with 24.76%saving compared with the direct evaporation ***,51.21%of the FeSO4 dissolved originally in the diluted sulfuric acid are precipitated out during the chemical dehydration,which greatly reduces the solid precipitation and effectively alleviates the scaling in the subsequent multi-effect evaporation process.

关键词： Chemical dehydration Multi-effect evaporation Sulfuric acid titanium

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Effect of hot-dip galvanizing processes on the microstructure and mechanical properties of 600-MPa hot-dip galvanized dual-phase steel

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International Journal of Minerals,Metallurgy and Materials 2017年第12期24卷 1379-1383页

作者： Chun-fu Kuang Zhi-wang Zheng Min-li Wang Quan Xu Shen-gen Zhang State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Research Institute of Pangang Group Institute for Advanced Materials and Technology University of Science and Technology Beijing

A C–Mn dual-phase steel was soaked at 800°C for 90 s and then either rapidly cooled to 450°C and held for 30 s(process A) or rapidly cooled to 350°C and then reheated to 450°C(process B) to simulate the hot-dip galvanizing process. The influence of the hot-dip galvanizing process on the microstructure and mechanical properties of 600-MPa hot-dip galvanized dual-phase steel(DP600) was investigated using optical microscopy, scanning electron microscopy(SEM), transmission electron microscopy(TEM), and tensile tests. The results showed that, in the case of process A, the microstructure of DP600 was composed of ferrite, martensite, and a small amount of bainite. The granular bainite was formed in the hot-dip galvanizing stage, and martensite islands were formed in the final cooling stage after hot-dip galvanizing. By contrast, in the case of process B, the microstructure of the DP600 was composed of ferrite, martensite, bainite, and cementite. In addition, compared with the yield strength(YS) of the DP600 annealed by process A, that for the DP600 annealed by process B increased by approximately 50 MPa because of the tempering of the martensite formed during rapid cooling. The work-hardening coefficient(n value) of the DP600 steel annealed by process B clearly decreased because the increase of the YS affected the computation result for the n value. However, the ultimate tensile strength(UTS) and elongation(A80) of the DP600 annealed by process B exhibited less variation compared with those of the DP600 annealed by process A. Therefore, DP600 with excellent comprehensive mechanical properties(YS = 362 MPa, UTS = 638 MPa, A_(80) = 24.3%, n = 0.17) was obtained via process A.

关键词： hot-dip galvanizing process dual-phase steel microstructure mechanical properties

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Effects of overaging temperature on the microstructure and properties of 600MPa cold-rolled dual-phase steel

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International Journal of Minerals,Metallurgy and Materials 2016年第8期23卷 943-948页

作者： Chun-fu Kuang Zhi-wang Zheng Gong-ting Zhang Jun Chang Shen-gen Zhang Bo Liu State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Research Institute of Pangang GroupPanzhihua 617000China Institute for Advanced Materials and Technology University of Science and Technology BeiiingBeiiing 100083China

C–Mn steels prepared by annealing at 800°C for 120 s and overaging at 250–400°C were subjected to pre-straining（2%） and baking treatments（170°C for 20 min） to measure their bake-hardening（BH_2） values. The effects of overaging temperature on the microstructure, mechanical properties, and BH_2 behavior of 600 MPa cold-rolled dual-phase（DP） steel were investigated by optical microscopy, scanning electron microscopy, and tensile tests. The results indicated that the martensite morphology exhibited less variation when the DP steel was overaged at 250–350°C. However, when the DP steel was overaged at 400°C, numerous non-martensite and carbide particles formed and yield-point elongation was observed in the tensile curve. When the overaging temperature was increased from 250 to 400°C, the yield strength increased from 272 to 317 MPa, the tensile strength decreased from 643 to 574 MPa, and the elongation increased from 27.8% to 30.6%. Furthermore, with an increase in overaging temperature from 250 to 400°C, the BH_2 value initially increases and then decreases. The maximum BH_2 value of 83 MPa was observed for the specimen overaged at 350°C.

关键词： dual-phase steel overaging temperature microstructure mechanical properties carbides

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Enhanced energy storage performance of BNT-SBT lead-free ceramics by a collaborative strategy of electrical properties modulation and grain refining via introducing KNN

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Ceramics International 2025年

作者： Long, Qiyu Zuo, Chengyang Xiao, Shihong Wei, Xianhua State Key Laboratory of Environmental-friendly Energy Materials Southwest University of Science and Technology Mianyang621010 China Vanadium and Titanium Resource Comprehensive Utilization Key Laboratory of Sichuan Province Panzhihua University Panzhihua617000 China

High-performance dielectric energy storage ceramics require high recoverable energy storage density, exceptional efficiency and eco-friendliness. However, it is still a challenge for Bi0.5Na0.5TiO3 lead-free ceramic due to its large remnant polarization. To address this, we have designed and fabricated (1-x)(0.55Bi0.5Na0.5TiO3-0.45Sr0.7Bi0.2TiO3)-xK0.5Na0.5NbO3 ((1-x)(BNT-SBT)-xKNN) by solution combustion synthesis (SCS) method. After the introduction of KNN, the change of dielectric relaxation behavior is found, and the bandgap widening and grain size refining are also observed. These collaborate to obtain a high recoverable energy storage density (6.68 J/cm3) and a high efficiency (87 %) under a high electric field of 517 kV/cm in 0.95(BNT-SBT)-0.05KNN (5xKNN). Furthermore, the 5xKNN samples exhibit excellent stability in terms of frequency, temperature, and cycling. Additionally, a large power density of ∼138.53 MW/cm3 (at 360 kV/cm), and an ultrafast discharge time of ∼97.2 ns are achieved. This work indicates that a collaborative strategy of electrical properties modulation and grain refining is effective for designing advanced dielectric energy storage ceramics with exceptional performance. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Ceramic capacitors

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The Research on The Deoxidization Process of Calcium Based Deoxidizer

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2nd International Conference on Chemical, Material and Metallurgical Engineering (ICCMME 2012)

作者： Wang, Jian PanGang Group Research Institute Co. Ltd. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization China

ISBN: (纸本)9783037855898

According to the compositional design of the calcium deoxidizer and the actual practice of producing HRB335 via converter-in BOF end, the percentages of [C] is 0.032%, the concentration of a[O] is 980ppm, the addition of calcium deoxidizer is 1.36Kg per ton of steel, and the argon oxygen activity is 42.84 ppm. The effect of deoxidization exceed the deoxidizer CaBaAlSi, the effect of deoxidization is fine and the product of deoxidization has no adverse effect on the steel quality. This deoxidization process could not only satisfy the quality requirement of the product, but also significantly reduce the cost. And both the finished product rate of rolled products and the mechanical properties meet the requirements of the national standard.

关键词： calcium based deoxidizer deoxidization process

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High-chromium vanadium-titanium magnetite all-pellet integrated burden optimization and softening-melting behavior based on flux pellets

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 498-507页

作者： Bojian Chen Tao Jiang Jing Wen Guangdong Yang Tangxia Yu Fengxiang Zhu Peng Hu 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 State key laboratory of vanadium and titanium resources comprehensive utilization Panzhihua 617000China

High-chromium vanadium-titanium magnetite(HVTM)is a crucial polymetallic-associated resource to be *** allpellet operation is a blast furnace trend that aims to reduce carbon dioxide emissions in the *** referencing the production data of vanadium-titanium magnetite blast furnaces,this study explored the softening-melting behavior of high-chromium vanadium-titanium magnetite and obtained the optimal integrated burden based on flux *** results show that the burden with a composition of 70wt%flux pellets and 30wt%acid pellets exhibits the best softening-melting *** comparison to that of the single burden,the softening-melting characteristic temperature of this burden composition was *** melting interval first increased from 307 to 362℃and then decreased to 282℃.The maximum pressure drop(ΔPmax)decreased from 26.76 to 19.01 *** permeability index(S)dropped from 4643.5 to 2446.8 kPa·℃.The softening-melting properties of the integrated burden were apparently *** acid pellets played a role in withstanding load during the softening *** flux pellets in the integrated burden exhibited a higher slag melting point,which increased the melting temperature during the melting *** slag homogeneity and the TiC produced by over-reduction led to the gas permeability deterioration of the single *** segregation of the flux and acid pellets in the HVTM proportion and basicity mainly led to the better softening-melting properties of the integrated burden.

关键词： high-chromium vanadium-titanium magnetite softening-melting properties all pellets integrated burden flux pellets

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Effect of chemical composition on the element distribution,phase composition and calcification roasting process of vanadium slag

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International Journal of Minerals,Metallurgy and Materials 2022年第12期29卷 2144-2151页

作者： Tangxia Yu Tao Jiang Jing Wen Hongyan Sun Ming Li Yi Peng State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000China School of Metallurgy Northeastern UniversityShenyang 110819China Key Laboratory for Ecological Metallurgy of Multimetallic Mineral of Ministry of Education Northeastern UniversityShenyang 110819China Liaoning Key Laboratory for Metallurgical Sensor and Technology Shenyang 110819China

The chemical composition of vanadium slag significantly affects its element distribution and phase composition,which affect the subsequent calcification roasting process and vanadium *** this work,seven kinds of vanadium slags derived from different regions in China were used as the raw materials to study the effects of different components on the vanadium slag’s elements distribution,phase composition,calcification roasting,and leaching rate of major elements using scanning electron microscope,X-ray diffraction analysis,and inductively coupled plasma-optical emission *** results show that the spinel phase is wrapped with silicate phase in all vanadium slag *** main elements in the spinel phase are Cr,V,and Ti from the interior to the *** size of spinel phase in low chromium vanadium slag is larger than the other vanadium slags with higher chromium *** spinel phase of high-calcium and high-phosphorus vanadium slag is more *** strongest diffraction peak of vanadium spinel phase in the vanadium slag migrates to a higher diffraction angle,and(Fe_(0.6)Cr_(0.4))_(2)O_(3)is formed after calcification roasting as the chromium content increased.A large amount of Ca_(2)SiO_(4)is produced because excess Ca reacts with Si in high-calcium and high-phosphorus vanadium *** vanadium leaching rate reaches 88%in some vanadium *** chromium leaching rate is less than 5%in all vanadium *** silicon leaching rate of high-calcium and high-phosphorus vanadium slag is much higher than that of the other *** leaching rate of manganese is higher than 10%,and the leaching rates of iron and titanium are negligible.

关键词： vanadium slag calcification roasting element distribution phase composition leaching rate

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In-situ Observation of High-temperature Phase Transformation of Ti-6Al-4V titanium Alloy 8

In-situ Observation of High-temperature Phase Transformation...

引用

2022 8th International Forum on Manufacturing Technology and Engineering Materials, IFEMMT 2022

作者： Zhu, Qiangqiang Yang, Xingdi Lan, Huifang Li, Jianping Zhang, Tianxing State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua617000 China State Key Laboratory of Rolling and Automation Northeastern University Shenyang110819 China

As a typical dual-phase titanium alloy, Ti-6Al-4V has a complex phase transformation process, which is sensitive to temperature parameters and difficult to control its microstructure. To further master the law of phase transformation of Ti-6Al-4V titanium alloy and make a reasonable heat treatment system, different heat treatment systems in ß single-phase region and (a+ß) two-phase region were made for Ti-6Al-4V titanium alloy, and the phase transformation process and microstructure growth rate of different heat treatment processes were studied by high-temperature confocal microscope. At 1050 °C and 1200 °C in the ß single-phase region, the ß grain size increases with the prolongation of the holding time and the increase of the holding temperature. The tissue growth rate of the a phase was higher than 1200°C in the cooling process after 1050°C incubation, which was 2.88 µm/s. Based on the heat preservation in the single-phase region, the second heat preservation was carried out for the two-phase region of Ti-6Al-4V titanium alloy at 850 °C and 900 °C. The study found that when the holding temperature was 850°C, the fastest growth rate of the a phase was 4.64 µm/s, which was greater than 3.29 µm/s when the holding temperature was 900°C. © Published under licence by IOP Publishing Ltd.

关键词： Aluminum alloys

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