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2024 6th International Conference on Advanced Materials and Ecological Environment, AMEE 2024

作者： Cao, Jiayi Yang, Yihong Li, Wanpeng Zhan, Zhixing Liu, Yuyi Li, Li Peng, Fuchang School of Vanadium & Titanium Panzhihua University Sichuan Panzhihua617000 China State Key Testing Laboratory of Vanadium & Titanium Sichuan Panzhihua617000 China Vanadium and Titanium Resource Comprehensive Utilization Key Laboratory of Sichuan Province Sichuan Panzhihua617000 China

Using tetrabutyl titanate as the titanium raw material and kapok flower core as the biological template, KBT-TiO2 samples with special morphology were prepared by a simple sol-gel process. The KBT-TiO2 samples were characterized by X-ray diffraction, scanning electron microscopy, UV-Vis and other techniques. Taking the photocatalytic degradation of methylene blue (MB) as a probe reaction, the visible light catalytic performance of different TiO2 samples was studied. The influence of calcination temperature and sample dosage on the photocatalytic performance of TiO2 were explored. The results showed that compared with the samples (pure-TiO2) synthesized by the non-template method, KBT-TiO2 samples retained and inherited the biological relic structure of the kapok flower core. Due to special morphology, the dispersion of KBT-TiO2 is improving, and its specific surface area is increased, it is beneficial to improving the visible light catalytic performance of the samples. As the calcination temperature increases, the catalytic performance of the sample first increases and then decreases. When the calcination temperature is 550°C, the calcination time is 3 hours, the initial concentration of MB is 10 mg·L-1 the sample input is 0.2 g, the photocatalytic performance of KBT-TiO2 samples reaches a maximum of 98.6%. The apparent first-order kinetic constant of the photocatalytic degradation of MB of KBT-TiO2 is 1.8 times that of pure-TiO2. © Published under licence by IOP Publishing Ltd.

关键词： Sol-gel process

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Template-free synthesis of porous TiO2/CdS for enhanced photocatalytic degradation from ilmenite

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Transition Metal Chemistry 2025年 1-12页

作者： Zhang, Zhichao Zhang, Jianbo Li, Kangzheng Tang, Binglin Wang, Xiaohui Tan, Ling Hu, Yijie Luo, Qingcheng Yin, Zhe Yu, Guoping Lv, Bo Faculty of Chemical Engineering Kunming University of Science and Technology Kunming650500 China State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Pangang Group Research Institute Co. Ltd. Sichuan Panzhihua617000 China

Natural mineral composite catalysts have attracted much attention due to their great potential in the fields of water treatment, air purification and energy conversion. In this study, porous TiO2 materials were synthesized from ilmenite by a two-stage calcination and acid leaching process, and porous TiO2/CdS composites were prepared by a hydrothermal method. The results of photocatalytic experiments indicate that the porous TiO2/CdS composite (PTC-2) with a Ti/Cd molar ratio of 1:1 exhibits the highest photocatalytic activity, with the degradation rate of methylene blue achieving a maximum value of 96.6% at 80 min. Moreover, the composite maintains a degradation efficiency of 88.5% after five cycles. The findings demonstrate that the TiO2/CdS heterojunction significantly enhances the photocatalyst's absorption of visible light while facilitating the effective separation and transfer of photogenerated electron–hole (e−/h+) pairs. The porous architecture of the composite facilitates superior electron transport pathways and effectively mitigates e−/h+ recombination. Furthermore, a mechanism for the photocatalytic degradation of organic dyes using porous TiO2/CdS composites is proposed, wherein photogenerated superoxide radicals (·O2−) and hydroxyl radicals (·OH) serve as the primary reactive species. This study explores the cost-effective synthesis of TiO2/CdS heterojunctions and makes a significant contribution to the advancement and utilization of natural minerals for pollution degradation. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.

关键词： Ilmenite

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Kinetics of isothermal reduction of carbon-containing silicomanganese dust

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International Journal of Minerals,Metallurgy and Materials 2025年第4期32卷 869-878页

作者： Ju Xu Guojun Ma Jie Xu Mengke Liu Xiang Zhang Dingli Zheng Junlong Li The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Pangang Group Research Institute Co.Ltd.Panzhihua 617000China Energy Recycling Economy Co. Ltd.Ningxia Shengyan Industrial GroupPingluo 753400China

Silicomanganese dust contains large amounts of valuables,such as Si and Mn,which can be used as raw materials for the smelting of ***,the direct addition of dust to the submerged arc furnace can influence the permeability of burden due to the fine particle size of dust,which results in incomplete reduction reactions during the smelting *** this paper,silicomanganese dust,graphite powder,and other additives were pressed to form carbon-containing dust briquettes,and the self-reduction process of the dust briquettes was investigated through the isothermal thermogravimetric method with different carbon–oxygen (C/O) molar ratios,contents of fluxing agents,and reduction *** reduction kinetic models for dust briquettes at different temperatures were *** results show that the reaction fraction of the dust briquettes was about 90%at a C/O molar ratio of 1.2 with optimal reduction *** addition of CaF_(2)contributed to the decrease in the melting point and viscosity of dust briquettes,which increased their reduction *** the reduction temperature increased,the reduction rate of dust briquettes *** reduction reaction rate of dust briquettes was controlled through gas-phase ***,their reduction process was analyzed kinetically,with the reaction time of 5 min as the dividing *** apparent activation energies for the two diffusion stages were 56.10 and 100.52 kJ/mol,*** kinetic equations are expressed as[1-(1-f)^(1/3)]^(2)=0.69e^(-56100/(RT))t and [1-(1-f)^(1/3)]^(2)=2.06e^(-100520/(RT))t.

关键词： silicomanganese dust carbothermal reduction isothermal reduction kinetics

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Ammonia-induced CuO/13X for H_(2)S removal from simulated blast furnace gas at low temperature

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Green Energy & Environment 2025年第1期10卷 139-149页

作者： Erping Cao Yuhua Zheng Hao Zhang Jianshan Wang Yuran Li Tingyu Zhu Zhan-guo Zhang Guangwen Xu Yanbin Cui State Key Laboratory of Mesoscience and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing100190China State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization PanGang Group Research Institute Co.Ltd.Panzhihua Sichuan617000China Shenyang University of Chemical Technology Shenyang110142China University of Chinese Academy of Sciences Beijing 100049China

Blast furnace gas(BFG)is an important by-product energy for the iron and steel industry and has been widely used for heating or electricity ***,the undesirable contaminants in BFG(especially H_(2)S)generate harmful environmental *** desulfurization of BFG is urgent for integrated steel plants due to the stringent ultra-low emission *** with other desulfurization materials,zeolite-based adsorbents represent a viable option with low costs and long service *** this study,an ammonia-induced CuO modified 13X adsorbent(NH_(3)–CuO/13X)was prepared for H_(2)S removal from simulated BFG at low *** XRD,H_(2)-TPR and TEM analysis proved that smaller CuO particles were formed and the dispersion of Cu on the surface of 13X zeolite was improved via the induction of *** on H_(2)S adsorption performance of the adsorbent was carried out using simulated BFG,and the results showed that NH_(3)–CuO/13X-3 has better breakthrough sulfur capacity,which was more than twice the sulfur capacity of CuO/*** is proposed that the enhanced desulfurization performance of NH_(3)–CuO/13X is attributed to an abundant pore of 13X,and combined action of 13X and *** work provided an effective way to improve the sulfur capacity of zeolite-based adsorbents via impregnation method by ammonia induction.

关键词： Blast furnace gas Desulfurization Ammonia-induced CuO 13X zeolite

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A technological process for extracting vanadium from leaching solution of sodium roasting of vanadium slag by manganese salt pretreatment

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Chinese Journal of Chemical Engineering 2025年 81卷 219-231页

作者： Mengxia Liu Tao Jiang Jing Wen Zibi Fu Tangxia Yu Changqing Li Xinyu An School of Metallurgy Northeastern University Shenyang 110819 China State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000 China

The ammonium salt precipitation method is frequently utilized for extracting vanadium from the leaching solution obtained through sodium roasting of vanadium slag. However, Na + and NH 4 + ions in the vanadium precipitation solution can not be effectively separated, leading to a large amount of ammonia-nitrogen wastewater which is difficult to treat. In this study, the manganese salt pretreatment process is used to extract vanadium from a sodium roasting leaching solution, enabling the separation of vanadium and sodium. The vanadium extraction product of manganese salt is dissolved in acid to obtain vanadium-containing leaching solution, then vanadium is extracted by hydrolysis and vanadium precipitation, and V 2 O 5 is obtained after impurity removal and calcination. The results show that the rate of vanadium extraction by manganese salt is 98.23%. The vanadium extraction product by manganese salt is Mn 2 V 2 O 7 , and its sodium content is only 0.167%. Additionally, the acid solubility of vanadium extraction products by manganese salt is 99.52%, and the vanadium precipitation rate of manganese vanadate solution is 92.34%. After the removal of manganese and calcination process, the purity of V 2 O 5 product reached 97.73%, with a mere 0.64% loss of vanadium. The Mn 2+ and NH 4 + ions in the solution after vanadium precipitation are separated by precipitation method, which reduces the generation of ammonia-nitrogen wastewater. This is conducive to the green and sustainable development of the vanadium industry.

关键词： Chemical industry

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Effect of initial microstructure on microstructure evolution and mechanical properties of 0.12C martensitic steels during quenching and tempering

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Journal of Iron and Steel Research International 2025年第1期32卷 260-269页

作者： Ya-ru Wang Zi-yong Hou He Yang Jun Zhao Zhi-yuan Chang Fan-mao Meng Ling Zhang Gui-lin Wu Xiao-xu Huang State Key Laboratory of Vanadium and Titanium Resource Comprehensive Utilization Panzhihua 617000SichuanChina State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai UniversityShanghai 200444China International Joint Laboratory for Light Alloys(Ministry of Education) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Institute of Steel Technology for Automobile and Household Appliance Pangang Group Co.Ltd.Panzhihua 617000SichuanChina ATB Motor(Shanghai)Co. Ltd.Keen International CenterShanghai 200041China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China

The microstructure evolution and mechanical properties of a Fe-0.12C-0.2Si-1.6Mn-0.3Cr-0.0025B(wt.%)steel with different initial microstructures,i.e.,hot rolled(HR)and cold rolled-annealed(CRA),were studied through optical microscopy,scanning electron microscopy,electron channeling contrast imaging,microhardness and room temperature uniaxial tensile *** water quenching from 930℃ to room temperature,a fully martensitic microstructure was obtained in both as-quenched HR and CRA specimens,which shows a microhardness of 480±5 HV,and no significant difference in microstructure and microhardness was *** test results show that the product of tensile strength and total elongation(UTS×TE)of the as-quenched HR specimen,i.e.,24.1 GPa%,is higher than that of the as-quenched CRA specimen,i.e.,18.9 GPa%.While,after being tempered at 300℃,the martensitic microstructures and mechanical properties of the two as-quenched specimens change significantly due to the synergy role of the matrix phase softening and the precipitation *** the maximum UTS×TE,it is 18.9 GPa%obtained in the as-quenched CRA one,while that is 24.4 GPa%obtained in the HR specimen after tempered at 300℃ for 5 min.

关键词： Initial microstructure Lath martensite Quenching Tempering Mechanical property

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A sustainable process for Pb, Zn, and Fe from copper slag by salt roasting-magnetization roasting-magnetic separation

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Process Safety and Environmental Protection 2025年 193卷 814-819页

作者： Gao, Xinze Lin, Yinhe Guan, Dong Liu, Zhaohua Deng, Bo Du, Qingshan Liu, Yanjun Yu, Sen Li, Juncheng Cao, Lingling School of Material Science and Engineering Jiangsu University Zhenjiang212013 China School of Chemistry Engineering Yangtze Normal University Chongqing408000 China State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Pangang Group Institute Co. Ltd. Panzhihua617000 China Xichang Hecheng Gongmao Co. Ltd. Xichang615000 China

Copper slag is a byproduct in the copper smelting process, rich in Pb, Zn and Fe and is an important recyclable secondary resource. In this study, Pb, Zn and Fe in copper slag were successfully recovered by the novel process of salt roasting-magnetization roasting-magnetic separation. With the addition of 12.5 % CaCl2 and 20 % CaO, copper slag was roasted at 1000 ℃ under the CO2 atmosphere, and the recovery rate of Pb, Zn and Fe was up to 99.72 %, 75.31 % and 80.32 % respectively. Hence, this method of salt roasting-magnetization roasting-magnetic separation provides a new approach to the comprehensive utilization of copper slag. © 2024 The Institution of Chemical Engineers

关键词： Magnetic separation

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Effect of Zr on Microstructure Evolution, Precipitation Behavior, and Mechanical Properties of Ti Microalloyed Low-Carbon High-Strength Steel during the Coiling Process

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Journal of Materials Engineering and Performance 2025年 1-14页

作者： Luo, Hanyu Lu, Chao Xiong, Xuegang Wang, Chuangwei Cao, Jianchun Faculty of Material Science and Engineering Kunming University of Science and Technology Kunming China State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Pangang Group Research Institute Co Ltd Panzhihua China

The microstructure evolution, precipitation behavior, and hardness changes of Ti microalloyed low-carbon high-strength steel in the range of 0-0.035 wt.% Zr during isothermal holding after austenite deformation were studied. Isothermal transformation kinetics and isothermal precipitation kinetics models were established for three tested steels at 600 °C for different isothermal times (10, 32, 63, 100, 316, and 1000 s), and the precipitation kinetics and their interaction with austenite ferrite transformation, as well as the influence of Zr, were discussed. The results indicate that as the isothermal time increases, the proportion of ferrite in the tested steel increases, while the proportion of martensite/bainite decreases. The addition of Zr inhibited the isothermal phase transformation, delayed the precipitation end time, and promoted the formation of acicular ferrite and bainite. With the increase of Zr content, the solid solubility of Ti in the matrix increases, the grain size of ferrite decreases, the nucleation incubation period of precipitation is shortened, and the nucleation rate increases. Isothermal precipitation occurs after the onset of austenite ferrite phase transformation. The main precipitates during the isothermal process were the carbide of Ti, with a lattice constant of about 0.436 nm, exhibiting a Baker–Nutting (BN) relationship with the ferrite matrix. As the Zr content increased from 0 to 0.035 wt.%, the fine grain strengthening increment of Ti microalloyed low-carbon high-strength steel increased from 260 to 306 MPa.

关键词： isothermal phase transformation low-carbon steel precipitation Zr

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Investigation of Hot Deformation Behavior and Dynamic Recrystallization Simulation of Ti–Zr Microalloyed Steel

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Steel Research International 2025年

作者： Luo, Hanyu Lai, Yiyue Xiong, Xuegang Wang, Chuangwei Cao, Jianchun Faculty of Material Science and Engineering Kunming University of Science and Technology Kunming650093 China State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Pangang Group Research Institute Co Ltd Panzhihua617000 China

Hot deformation behavior and dynamic recrystallization (DRX) behavior of Ti–Zr microalloyed steel are investigated through isothermal compression tests under deformation temperatures range of 900–1050 °C and strain rates range of 0.01–10 s−1. Based on the analysis of stress–strain curves, an Arrhenius model with strain compensation is established. The correlation coefficient and average absolute relative error calculated according to the model are 0.99 and 4.37%, respectively. Utilizing the experimental results and relevant physical models, a cellular automaton model is developed to predict the DRX characteristics and microstructure evolution. As the deformation temperature increases, the DRX nucleation and growth of austenite in Ti–Zr microalloyed steel are promoted. An increase in strain rate results in a higher proportion of fine DRX grains, with the most complete DRX occurring at 0.01 s−1 and a multimodal microstructure observed at 10 s−1. The strain rate primarily regulates the austenite grain size after DRX in Ti–Zr microalloyed steel by influencing nucleation density. The accuracy of the constructed cellular automaton model is verified through a detailed comparison between the simulated predictions and the results. © 2025 Wiley-VCH GmbH.

关键词： Austenite

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Molecular dynamics simulations of ionic transport, local structures, and physicochemical properties of multi-component NaCl-MgCl2-CaCl2-FeCl2/FeCl3 molten salt systems

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Materials Today Communications 2025年 45卷

作者： Xu, Jianlin Tian, Feng Zhu, Fuxing Pang, Zhongya Ma, Zhanshan Miao, Han Zhang, Xueqiang Han, Chenyang Xu, Qian Zou, Xingli Lu, Xionggang State Key Laboratory of Advanced Special Steel & School of Materials Science and Engineering Shanghai University Shanghai200444 China State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Pangang Group Research Institute Co. Ltd. Sichuan Panzhihua617000 China

TiCl4 is a vital intermediate raw material for the production of both metallic titanium and titanium dioxide pigment via the chloride process. The current low-grade titanium feedstock available in China is more suitable for the preparation of TiCl4 by molten salt chlorination. However, industrial practice reveals that the prolonged presence of FeCl2 and FeCl3 in the molten salt deteriorates its chlorination properties, posing significant challenges for efficient titanium production. This study employs large-scale molecular dynamics simulations to address deficiencies in thermodynamic structure data for the multi-component NaCl-MgCl2-CaCl2-FeCl2/FeCl3 system, particularly focusing on key structural and transport properties, including mean square displacement (MSD) and radial distribution function (RDF), etc. Additionally, the rotation-pendulum and Archimedes methods were utilized to assess the influences of varying FeCl2/FeCl3 content on the viscosity and density of the molten salt. The results show that Fe2+ and Fe3+ ions significantly affect the structure and transport properties of other ions in the molten salt compared to Na+ and Ca2+. These ions form stronger bonds with Cl−, promoting the formation of longer chain structures and the formation of larger ionic clusters. As a result, elevated levels of Fe2+ and Fe3+ ions correlate positively with increased viscosity, owing to the microstructural changes arising from ion pair interactions. This work may provide a new strategy for extending the operational lifespan of molten salts employed in titanium slag chlorination processes while enhancing its chlorination efficiency, which would be beneficial for facilitating a cleaner and more efficient route for the utilization of titanium resources. © 2025 Elsevier Ltd

关键词： Viscosity

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