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2016 International Conference on Materials Science and Nanotechnology

作者： Ming Li Liang Xiao Jingjing Liu Zhixin Shi Zibi Fu Yi Peng Panzhong Long Yangjun Yang Pangang Group Research Institute Co. Ltd. State Key Laboratory for Comprehensive Utilization of Vanadium and Titanium Resources Panzhihua College

The extraction of vanadium and chromium from high chromium content vanadium slag by salt roasting and water leaching process has been investigated, which uses mixed sodium salts（NaCO and NaOH） as additive agent in roasting process. The mineralogical morphology was prospected by TG-DSC, XRD, SEM and EDS. The oxidation of slag and transversion of V/Cr-containing phase and sodium salts have been discussed. It has been demonstrated that the presence of NaOH contributes to decompose spinel and olivine phases, which is beneficial to reduce the roasting temperature and elevate V, Cr leaching ratio. The roasting parameters have been studied as a function of roasting temperature, roasting time and ratio of alkali, in which the roasting temperature is the most effective factor on the leaching rate of vanadium and chromium. Under the optimum condition, the leaching rates of V and Cr reached 95.8% and 97.6%, respectively.

关键词： vanadium-chromium slag sodium salts roasting mixed sodium salts high efficiency extraction

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A study on Hot-Rolling deformation resistance of a trip steel

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Applied Mechanics and Materials 2014年 692卷 359-365页

作者： Yu, Can-Sheng Zheng, Zhi-Wang Wang, Min-Li Zhang, Gong-Ting Pangang Group Research Institute Co. Ltd State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization No.90 Taoyuan Street PanzhihuaSichuan China

ISBN: (纸本)9783038353300

The hot-rolling deformation resistances of a TRIP Steel were studied by using a Gleeble-3500 thermal simulator. The true stress-true strain curves of the TRIP steel is determined under different hot-rolling deformation conditions, and the effect of deformation temperature, strain rate and deformation amount on the deformation resistance was evaluated. Based on experimental results, the mathematic model for the calculation of the deformation resistance of the TRIP Steel has been set up by the regression analysis by means of the origin software. It is found that the simulated stress-strain curves have good curve-fitting performance.

关键词： Regression analysis

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Design of new weathering steels through thermodynamic model of nitrogen solubility and CALPHAD

Design of new weathering steels through thermodynamic model ...

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Chinese Materials Conference, CMC 2017

作者： Cheng, Jian Guo, Yue Hua Liu, Ming Shen, Hou Fa Key Laboratory for Advanced Materials Processing Technology Ministry of Education School of Materials Science and Engineering Tsinghua University Beijing100084 China Pangang Group Research Institute Co. Ltd. State Key Laboratory of Vanadium and Titanium Comprehensive Utilization PanzhihuaSichuan617000 China

ISBN: (纸本)9783035712445

In this paper, a new vanadium nitrogen (V-N) microalloyed high strength weathering steel with the yield strength and tensile strength higher than 550 MPa and 650 MPa was designed and developed by using thermodynamic model of nitrogen solubility and phase diagram database of CALPHAD. Based on the established thermodynamic model, the effect of C content on nitrogen solubility in molten steel was investigated. The nitrogen solubility increases with the decrease of C content and the increase of temperature. In order to obtain higher N content in steel, C content must be controlled at a low range of 0.03~0.04%. Furthermore, an allowable concentration range of C and N was selected based on the phases quantity prediction of VN/V(C,N), (Cr, Fe)7 C3, AlN and γ through the CALPHAD approach. Consequently, five new weathering steels were designed with variations of (C+N) content or N/C ratio. And then the four selected steels were cast, hot rolled and air cooled. The tensile tests at the room temperature show that the yield strength and tensile strength of steel with 0.032% C and 0.038%N satisfy the requirements of new generational weathering steel. © 2018 Trans Tech Publications, Switzerland.

关键词： Tensile strength

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Cyclic metallurgical process for extracting Ⅴ and Cr from vanadium slag: Part Ⅰ. Separation and recovery of Ⅴ from chromium-containing vanadate solution

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Transactions of Nonferrous Metals Society of China 2021年第3期31卷 807-816页

作者： Xue-wen WANG Ming-e YANG Yu-qi MENG Da-xiong GAO Ming-yu WANG Zi-bi FU School of Metallurgy and Environment Central South UniversityChangsha 410083China Hunan Automotive Engineering Vocational College Zhuzhou 412001China State Key Laboratory for Comprehensive Utilization of Vanadium and Titanium Resources Pangang Group Research Institute Co.Ltd.Panzhihua 617000China

The separation and recovery of V from chromium-containing vanadate solution were investigated by a cyclic metallurgical process including selective precipitation of vanadium,vanadium leaching and preparation of vanadium *** adding Ca(OH)_(2) and ball milling,not only the V in the solution can be selectively precipitated,but also the leaching kinetics of the precipitate is significantly *** precipitation efficiency of V is 99.59%by adding Ca(OH)_(2) according to Ca/V molar ratio of 1.75:1 into chromium-containing vanadate solution and ball milling for 60 min at room temperature,while the content of Cr in the precipitate is 0.04%.The leaching rate of V reaches 99.35%by adding NaHCO_(3) into water according to NaHCO_(3)/V molar ratio of 2.74:1 to leach V from the precipitate with L/S ratio of 4:1 mL/g and stirring for 60 min at room *** crystals of NH_(4)VO_(3) are obtained by adjusting the leaching solution pH to be 8.0 with CO2 and then adding NH_(4)HCO_(3) according to NH_(4)HCO_(3)/NaVO_(3) molar ratio of 1:1 and stirring for 8 h at room *** filtration,the crystallized solution containing ammonia is reused to leach the precipitate of calcium vanadates,and the leaching efficiency of V is>99%after stirring for 1 h at room ***,the product of V_(2)O_(5) with purity of 99.6%is obtained by calcining the crystals at 560℃ for 2 h.

关键词： chromium-containing vanadate solution calcium salt precipitating vanadium sodium bicarbonate leaching ammonium salt precipitating vanadate cyclic metallurgical process

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Dual-frequency multi-function switchable metasurface

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Optik 2021年 248卷

作者： Li, Fuyu Tang, Tingting Liu, Bo Peng, Sui Liang, Xiao Tang, Yujie He, Ke Li, Jun State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization PanzhihuaSichuan617000 China College of Optoelectronic Engineering Chengdu University of Information Technology ChengduSichuan610225 China

Most metasurfaces can manipulate electromagnetic waves in the deep sub-wavelength range, but often have the disadvantages of low modulation depth and single-frequency operation. Here, a vanadium dioxide composite aluminum antenna (VCAA) for dual-frequency switchable function is proposed. After the vanadium dioxide (VO2) phase transition, the VCAA can achieve a high reflection coefficient (about 0.78) and 2π phase coverage independently at different frequencies under circular polarization (CP) incidence by rotating double C-type resonator and double D-type resonator. In order to better understand this characteristic, the surface electric field distribution of the metasurface is calculated and analyzed. Three temperature-switchable metasurfaces with beam splitting, focusing (divergence) and vortex beams functions at different frequencies are designed by encoding different arrangements of particles and convolution operations. And these functions are not influenced by the temperature at 0.52 THz, but have the effect of temperature-switchable at 0.98 THz. The functions of these three metasurfaces are demonstrated and verified from the perspective of electric field and phase. This work provides a new method for the dynamic regulation of terahertz waves and the design of multi-frequency devices, and accelerates the development of terahertz communications and information encryption. © 2021 Elsevier GmbH

关键词： vanadium dioxide

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Effect of Hydrolysis on vanadium Precipitation with Acidic Ammonium Salt from High Concentration of Alkaline vanadium Solution

SSRN

引用

SSRN 2022年

作者： Jiang, Lin He, Wenyi Du, Guangchao Zheng, Hao Peng, Yi State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Pangang Group Research Institute Co. Ltd. Sichuan Panzhihua617000 China

vanadium precipitation with acidic ammonium salt is widely applied in industrial practice of vanadium oxide production. However, the ammonia wastewater produced in this process and the resultant environmental problem have been paid increasing attention. With the intention of reducing wastewater and the corresponding treatment cost, it is directly effective to enhance the vanadium content of basic qualified solution. Unfortunately, high vanadium concentration brings about a lower vanadium precipitation rate and higher Na 2 O content in ammonium poly-vanadate (APV), as a result of the hydrolysis as the secondary reaction in the vanadium precipitation process. The mechanism and effect of hydrolytic vanadium reaction on precipitation result has rarely been reported. Therefore, the whole precipitation process, including the effect of pH value, reaction temperature and vanadium concentration on vanadium precipitation were firstly clarified by analyzing the thermodynamic form of vanadate radicals in this paper. Simultaneously, a study on technological parameters was conducted based on the results of theoretical analysis. The phase composition and crystal morphology of the precipitates were also inspected using XRD, SEM-EDS. The results show that the secondary reaction of vanadium hydrolysis cannot be eliminated in the process of vanadium precipitation with acidic ammonia salt. When the vanadium content is higher than 35 g/L, Na 2 O in APV is easy to exceed 0.8%. Na 2 O mainly occurs in V 2 O 5 ·H 2 O in the form of amorphous body or chemical absorption. The results in this work could provide a fundamental guide for the application of high concentration vanadium precipitation. © 2022, The Authors. All rights reserved.

关键词： Precipitation (chemical)

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Influence of pyrolysis temperature on tea waste-based biochar property and function as a heavy metal sorbent in aqueous solution 6

Influence of pyrolysis temperature on tea waste-based biocha...

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6th International Conference on Mechanical, Aeronautical and Automotive Engineering, ICMAA 2022

作者： Cui, X.L. Zhong, J. Li, H.X. Jin, R.Z. Liu, Y. Che, X.K. Yuan, X.T. Zhang, Q.D. Fu, H. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Sichuan Panzhihua617000 China National Engineering Laboratory of Biohydrometallurgy GRINM Resources and Environmental Technology Corporation Limited Beijing101407 China GRINM Group Corporation Limited Beijing100088 China University of Science and Technology Beijing Beijing100083 China State Key Laboratory of Mineral Processing Beijing102628 China Environmental Technology Corporation Limited Zibo255314 China

The properties of biochars and their adsorption performance are highly dependent on the pyrolysis temperature. In this study, tea waste-based biochars at the different pyrolysis temperature (573K-973K) were investigated, and adsorption capacities of heavy metals from solution by biochars were studied. TG/DTA and SEM results showed that with the increased of pyrolysis temperature, the yield of biochar sharply declined and reached stable at 973K. Moreover, low ratios of H/C, O/C and (O+N)/C were obtained at high pyrolysis temperature, which could produce more pore structure and be conducive to the adsorption of heavy metal ions. The adsorption experiments confirmed that the Pb and Zn absorption efficiency at 973K could reach 99.98% and 30.49%, respectively, which was the optimum temperature. © Published under licence by IOP Publishing Ltd.

关键词： Heavy metals

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Reaction synthesis of (V,Nb)C particle reinforced iron matrix composites by in-situ powder sintering

Reaction synthesis of (V,Nb)C particle reinforced iron matri...

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Materials Science and Technology Conference and Exhibition 2013, MS and T 2013

作者： Xian, Yong Wang, Yisan Sun, Zhaohui Zhai, Qijie Pangang Group Research Institute Co. Ltd. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000 Sichuan China School of Manufacturing Sci. and Eng. Sichuan University Chengdu 610065 China School of Materials Science and Engineering Shanghai University Shanghai 200072 China

ISBN: (纸本)9781629933092

In-situ reaction synthesis of (V,Nb)C particle reinforced iron matrix composites was conducted by powder sintering and the formation of complex carbide phase, microstructure, hardness and bending strength were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM),energy dispersive X-ray spectrometer (EDS), Rockwell hardness tester and flexural strength test machine, respectively. The results indicated that the lattice parameter of the complex carbide (V,Nb)C with Nb/V mole ratio 0∼0.5 was a=4.172Å∼4. 273Å, and the hardness and bending strength were improved significantly due to lower bainite and martensite forming and particle refinement attributed to Nb/V mole ratio increasing. Copyright © 2013 MS&T'13®.

关键词： Microstructure

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Research on Application Mechanism of vanadium Extraction Tailings by Cleaner Production

Research on Application Mechanism of Vanadium Extraction Tai...

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2012 Asian Pacific Conference on Energy,Environment and Sustainable Development(APEESD 2012)

作者： Wang Jian Chen Lian Jiang Long-kui Yi Liang-gang Huang shengquan Zhang Yong-Jun PanGang Group Research Institute Co. Ltd. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization PanGang Group Chengdu Steel & vanadium Co. Ltd

ISBN: (纸本)9783037855683

In order to make sure the application direction of vanadium extraction tailings, basic characteristics, slagging mechanism of vanadium extraction tailings as well as thermal decomposition temperature and absorbed heat of CaSO4 in vanadium extraction tailings are analyzed, in addition, the effect of charging vanadium extraction tailings under supersaturation state on the sulfur content in steel is studied by using induction furnace under low sulfur condition. The results of research and application indicate that vanadium extraction tailings after desulfuration treatment can be used to steelmaking-slagging, and the application effect is obviously.

关键词： vanadium extraction tailings by cleaner production desulfuration steelmaking-slagging

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3D porous V2O5 architectures for high-rate lithium storage

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Journal of Energy Chemistry 2020年第1期29卷 15-21,I0002页

作者： Qifei Li Dong Chen Huiteng Tana Xianghua Zhang Xianhong Rui Yan Yu Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006GuangdongChina Hefei National Laboratory for Physical Sciences at the Microscale Department of Materials Science and EngineeringKey Laboratory of Materials for Energy ConversionChinese Academy of Sciences(CAS)University of Science and Technology of ChinaHefei 230026AnhuiChina State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000SichuanChina Dalian National Laboratory for Clean Energy(DNL) Chinese Academy of SciencesDalian 116023LiaoningChina State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026AnhuiChina Guangdong University of Technology Guangzhou 510006GuangdongChina University of Science and Technology of China Hefei 230026Anhui.China

The discovery of novel electrode materials promises to unleash a number of technological advances in lithium-ion batteries.V2O5 is recognized as a high-performance cathode that capitalizes on the rich redox chemistry of vanadium to store *** unlock the full potential of V2O5,nanotechnology solution and rational electrode design are used to imbue V2O5 with high energy and power density by addressing some of their intrinsic disadvantages in macroscopic crystal ***,we demonstrate a facile and environmental-friendly method to prepare nanorods-constructed 3D porous V2O5 architectures(3 D-V2O5)in *** 3D porous architecture is found to be responsible for the enhanced charge transfer kinetics and Li-ion diffusion rate of the 3D-V2O5 *** the result,the 3D-V2O5 surpasses the conventional bulk V2O5 by showing enhanced discharge capacity and rate capability(delivering 154 and 127 m Ah g^-1 at 15 and 20 C,respectively).

关键词： Lithium storage V2O5 cathode Porous structure Mass production High rate

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