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Determination of 18 kinds of trace impurities in the vanadium battery grade vanadyl sulfate by ICP-OES

IOP Conference Series: Earth and Environmental Science 2018年第1期128卷

作者： Cheng Yong PanGang Group Research Institute Co. Ltd. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000 Sichuan China

The method that direct determination of 18 kinds of trace impurities in the vanadium battery grade vanadyl sulfate by inductively coupled plasma atomic emission spectrometry (ICP-OES) was established, and the detection range includes 0.001% ~ 0.100% of Fe, Cr, Ni, Cu, Mn, Mo, Pb, As, Co, P, Ti, Zn and 0.005% ~ 0.100% of K, Na, Ca, Mg, Si, Al. That the influence of the matrix effects, spectral interferences and background continuum superposition in the high concentrations of vanadium ions and sulfate coexistence system had been studied, and then the following conclusions were obtained: the sulfate at this concentration had no effect on the determination, but the matrix effects or continuous background superposition which were generated by high concentration of vanadium ions had negative interference on the determination of potassium and sodium, and it produced a positive interference on the determination of the iron and other impurity elements, so that the impacts of high vanadium matrix were eliminated by the matrix matching and combining synchronous background correction measures. Through the spectral interference test, the paper classification summarized the spectral interferences of vanadium matrix and between the impurity elements, and the analytical lines, the background correction regions and working parameters of the spectrometer were all optimized. The technical performance index of the analysis method is that the background equivalent concentration -0.0003%(Na)~0.0004%(Cu), the detection limit of the element is 0.0001%~ 0.0003%, RSD<10% when the element content is in the range from 0.001% to 0.007%, RSD< 20% even if the element content is in the range from 0.0001% to 0.001% that is beyond the scope of the method of detection, recoveries is 91.0% ~ 110.0%.

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Effect of Pulsed Magnetic Field Treatment on Microstructure and Fatigue Life of Tc4 Alloy Fabricated by Slm

SSRN

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SSRN 2023年

作者： Hu, Zhenshang Xue, Ling Zhang, Xinzhou Yang, Yi Lu, Dong Liu, Yongsheng Wu, Mingxia School of Mechanical Engineering Sichuan University Chengdu610065 China Sichuan Advanced Metal Material Additive Manufacturing Engineering Technology Research Center Chengdu Advanced Metal Materials Industry Technology Research Institute Co. Ltd. Chengdu610300 China State Key Laboratory of Vanadium Titanium Resources Comprehensive Utilization Pangang Group Research Institute Co. Ltd. Panzhihua617000 China

Microstructural defects have been considered to be detrimental to fatigue life of SLM-produced TC4. To improve fatigue property of the alloy, pulsed magnetic field (PMT) treatment, an efficient post-processing technique, was utilized in this work. The evolution concerning fatigue life, microstructure, stress state and fatigue fracture behavior influenced by PMT was investigated. After the treatment, the average fatigue life under a certain load is increased by 471.13%, and the reliability of the life of the specimen is improved. The mechanism that PMT action on the microstructure lies in dislocation motion. It is found that the dislocation density is obviously reduced and the distribution is more uniform. Moreover, under the influence of dislocation, the residual stress (RS) on the surface of the material changes from tensile state to compressive state, and its magnitude is reduced by more than 60%. In addition, through the comparative analysis of fatigue initiation and microstructure, the PMT treated samples exhibit better fracture behavior. The improvement of PMT on the fatigue properties of SLM-produced TC4 can be verified by comparing the primary slip systems and dislocations. © 2023, The Authors. All rights reserved.

关键词： Residual stresses

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Influence of Riboflavin on the Corrosion of X80 Pipeline Steel by Sulfate Reducing Bacteria

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SSRN 2023年

作者： Fu, Lei Lin, Li Yan, Shisen Luo, Yunrong Zhang, Yingqian Lai, Sheng Wang, Zhengguo Tan, Mingxing School of Mechanical Engineering Sichuan University of Science & Engineering Zigong643000 China Failure Mechanics and Engineering Disaster Prevention Key Lab of Sichuan Province Sichuan University Chengdu610065 China Key Laboratory of Deep Earth Science and Engineering Sichuan University Ministry of Education Chengdu610065 China School of Material Science and Engineering Sichuan University of Science & Engineering Zigong643000 China Vanadium and Titanium Resource Comprehensive Utilization Key Laboratory of Sichuan Province Panzhihua617000 China Sichuan Provincial Key Lab of Process Equipment and Control Zigong643000 China School of Civil Engineering Sichuan University of Science & Engineering Zigong643000 China

Sulfate reducing bacteria (SRB) are facultative anaerobic, and the electron transfer process of their growth and metabolic activities is as follows: the electrons released from the metal surface pass through the cell wall into the cell by extracellular electron transfer, and the electron shuttle to the body plays the role of electron transfer between cells and metals. In this study, the effect of riboflavin (RF) as an electron shuttle on SRB corrosion of X80 pipeline steel was analyzed. The results showed that the addition of 10 ppm RF to the SRB medium did not significantly change the type of corrosion products, but resulted in an enlarged corrosion pit area and an increased pit depth. The corrosion weight loss rate of the SRB + 10 ppm RF system is about 3 times that of the SRB system, and the corrosion current density of the polarization curve is about 38% higher than that of the SRB system. Therefore, RF can transfer the electrons released by iron oxidation to the cytoplasm by means of electron transfer across the cell wall, thereby accelerating the corrosion of X80 steel. This further proves that the electronic medium RF can accelerate the microbial influenced corrosion (MIC) caused by SRB. © 2023, The Authors. All rights reserved.

关键词： Electron transport properties

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Study on the process of TC4 powders prepared by electrode induction melting gas atomization for laser 3D printing

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IOP Conference Series: Materials Science and Engineering 2019年第1期668卷

作者： B Xie Y Z Fan Q D Miao State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000 Sichuan China Pangang Group Research Institute Co. Ltd. Panzhihua 617000 Sichuan China

This study employed TC4 rod as raw material to fabricate TC4 powders for laser 3D printing via electrode induction melting gas atomization (EIGA). The morphologies, phase compositions, particle size distributions, apparent densities and flowabilities of the powders were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), laser particle size analyzer (LPS) and Hall flowmeter, respectively. Moreover, the effects of gas atomization pressure and melting temperature on the yield of TC4 powders for laser 3D printing were studied. The results showed that TC4 powders morphology was nearly regular spherical. The particle size of TC4 powders showed a single peak normal distribution, mainly distributed in the range of 15−180 μm. The powder was α'−Ti of a single phase solid solution. The optimum parameters were gas atomization pressure of 5MPa, melting temperature of 1750°. Under the optimized condition, the average particle size D50 was 60.2 μm, the yield of printable TC4 powders was 35.6%, the flowability was 41.2 s/50g, the apparent density was 2.76 g/cm3 and oxygen content was 800 ppm, which was in line with the ASTM test standard and was conformed to the requirement for laser 3D printing.

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Erratum to: Flotation characteristics of two different types of ilmenite with sodium oleate

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Mineralogy and Petrology 2015年第3期109卷 307-307页

作者： Zhang, Jie Liu, Weijun Wang, Weiqing Xiong, Shuqing Wang, Dezhi Yan, Wu Deng, Jie School of Environment and Resource Southwest University of Science and Technology Mianyang Poeple’s Republic of China Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of Education Mianyang Poeple’s Republic of China Key Laboratory of Vanadium-titanium Magnetite Comprehensive Utilization Ministry of Land and Resources Chengdu Poeple’s Republic of China

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Study on environment-friendly passivation for hot-dip galvanized steel with high corrosion resistance

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IOP Conference Series: Materials Science and Engineering 2020年第1期711卷

作者： Xueqiang Dong Taixiong Guo Zhouyilin Pangang Group Research Institute Co. Ltd. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000 Sichuan China PanGang Group Panzhihua Steel & Vanadium Co. Ltd. Panzhihua 617000 Sichuan China

In order to improve the corrosion resistance of hot-dip galvanized steel, experimental study developed a new trivalent chromium passivation film with high corrosion resistant. The preparation method of passivation coating with high corrosion resistant was that the CrO3 was reduced to trivalent chromium by sufficient organic compound with reduction, then added colloidal SiO2, the matter containing radical phosphate and other substances after reaction completely. The passivation coating did not contain hexavalent chromium, and can meet the requirement of RoHS directive, so the film on hot-dip galvanized steel after passivation was environment-friendly. After coated on the hot-dip galvanized steel, the coating could be fast drying at 100 °C about 10s to 20s. The film was uniform, and did not appear floating, falling and other abnormal phenomenon, so that the passivation coating had good coating performance. The passivation reaction of the new trivalent chromium coating on the hot-dip galvanized steel was compound processes of electrochemical reaction, precipitation reaction and physical deposition. The passivation film produced no corrosion basically after 120h in the neutral salt spray test according to the Chinese national standards GB/T10125 and corroded area is less than 5% after 216 h, thus the corrosion resistance of the passivation film was excellent. In addition, the film has excellent heat resistance and fingerprint resistance, so it can meet the requirements of the user.

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Numerical Investigation into the Impact of Oxy-Fuel Combustion on the Thermochemical State and Slab Heating Behaviour Inside a Metallurgical Heating Furnace

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SSRN 2024年

作者： Dianyu, E. Yang, Yifeng Weng, Lingyi Yang, Yingxin Liu, Yonggang Chen, Chao Cui, Jiaxin Liu, Lingling Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and Technology Nanchang330013 China International Institute for Innovation Jiangxi University of Science and Technology Nanchang330013 China School of Energy and Mechanical Engineering Jiangxi University of Science and Technology Nanchang330013 China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and Technology Ganzhou341000 China Xinyu Iron and Steel Group Co. Ltd Xinyu338001 China College of Materials Science and Engineering Taiyuan University of Technology Taiyuan030024 China State Key Laboratory of Vanadium Titanium Resources Comprehensive Utilization Chengdu610031 China Pangang Group Research Institute Co. Ltd. Chengdu610031 China Monash University Australia

Oxy-fuel combustion is a promising technology for the merits of energy-saving and NOx emission reduction and has been gradually promoted to the application of metallurgical heating furnaces. For the purpose of understanding and optimizing the heating process of the industrial furnace, with a particular focus on the effect of fuel types and oxy-fuel combustion, a comprehensive transient 3D CFD model was built for the simulation of the complicated in-furnace thermochemical states and the gas-solid heat transfer at multi-scales. It was observed that under constant calorific heat input conditions, the fuel composition appears to have little influence on the internal thermal state and the slab heating. Meanwhile, oxy-fuel combustion enhances the in-furnace heat radiation intensity, leading to higher average gas and thus higher slab temperatures. However, the in-furnace thermal distribution becomes uneven and the slab internal temperature difference increases. Under the prerequisite that the slab temperature leaving the furnace is between 1373-1573 K and the maximum internal temperature difference is less than 50 K/m, the production efficiency can be increased by 6.25% when oxy-fuel combustion is applied, with the corresponding slab residence time decreases from 7424s to 6960s. © 2024, The Authors. All rights reserved.

关键词： Optimization

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A Bismuth-Based Zeolitic Organic Framework with Coordination-Linked Metal Cages for Efficient Electrocatalytic CO2Reduction to HCOOH

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Angewandte Chemie 2023年第45期135卷

作者： Prof. Zhiqiang Jiang Prof. Minyi Zhang Xingliang Chen Bing Wang Wenjuan Fan Chenhuai Yang Xiaoju Yang Prof. Zhicheng Zhang Prof. Xuan Yang Prof. Chunsen Li Prof. Tianhua Zhou Vanadium and Titanium Resource Comprehensive Utilization Key Laboratory of Sichuan Province Panzhihua University Panzhihua 617000 P. R. China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 P. R. China Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of Chemistry School of Science Tianjin University Tianjin 300072 P. R. China School of Chemistry and Chemical Engineering Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education) Huazhong University of Science and Technology Wuhan 430074 P. R. China

Zeolitic metal–organic frameworks (ZMOFs) have emerged as one of the most promsing catalysts for energy conversion, but they suffer from either weak bonding between metal-organic cubes (MOCs) that decrease their stability during catalysis processes or low activity due to inadequate active sites. In this work, through ligand-directing strategy, we successfully obtain an unprecedented bismuth-based ZMOF (Bi-ZMOF) featuring a ACO topological crystal structure with strong coordination bonding between the Bi-based cages. As a result, it enables efficient reduction of CO 2 to formic acid (HCOOH) with Faradaic efficiency as high as 91 %. A combination of in situ surface-enhanced infrared absorption spectroscopy and density functional theory calculation reveals that the Bi−N coordination contributes to facilitating charge transfer from N to Bi atoms, which stabilize the intermediate to boost the reduction efficiency of CO 2 to HCOOH. This finding highlights the importance of the coordination environment of metal active sites on electrocatalytic CO 2 reduction. We believe that this work will offer a new clue to rationally design zeolitic MOFs for catalytic reaction

关键词： Bismuth CO2 Reduction Electrocatalysis Metal–Organic Framework Zeolite

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Lithium-Ion Batteries: Nanostructured Li3V2(PO4)3Cathodes (Small 21/2018)

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Small 2018年第21期14卷

作者： Huiteng Tan Lianhua Xu Hongbo Geng Xianhong Rui Chengchao Li Shaoming Huang Collaborative Innovation Center of Advanced Energy Materials School of Materials and Energy Guangdong University of Technology Guangzhou 510006 China School of Energy and Environment Anhui University of Technology Maanshan 243002 China School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 China Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University Tianjin 300071 China State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000 China

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Hydrogel, the Next-Generation Electrolyte for Electrochromic Devices

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physica status solidi (RRL) – Rapid Research Letters 2024年第1期18卷

作者： Feifei Zhao Bin Wang Jingwei Chen Sheng Cao Yadong Yang William W. Yu Haizeng Li State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Pangang Group Research Institute Panzhihua 617000 China Institute of Frontier and Interdisciplinary Science Shandong University Qingdao Shandong 266237 China School of Chemistry & Chemical Engineering Shandong University Jinan Shandong 250100 China School of Materials Science and Engineering Ocean University of China Qingdao 266100 China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi University Nanning 530004 China

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