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Viscosity and structure relationship with equimolar substitution of CaO with MgO in the CaO–MgO–Al_(2)O_(3)–SiO_(2)slag melts

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 70-79页

作者： Yong Hou Shuo Zhang Jie Dang Jia Guo Hanghang Zhou Xuewei Lü college of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of vanadium-titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China

Currently,the Al_(2)O_(3)content in the high-alumina slag systems within blast furnaces is generally limited to 16wt%–18.5wt%,making it challenging to overcome this *** most studies that concentrated on managing the MgO/Al_(2)O_(3)ratio or basicity,this paper explored the effect of equimolar substitution of MgO for CaO on the viscosity and structure of a high-alumina CaO-MgO-Al_(2)O_(3)-SiO_(2)slag system,providing theoretical guidance and data to facilitate the application of high-alumina *** results revealed that the viscosity first decreased and then increased with higher MgO substitution,reaching a minimum at 15mol%MgO *** transform infrared spectroscopy(FTIR)results found that the depths of the troughs representing[SiO_(4)]tetrahedra,[AlO_(4)]tetrahedra,and Si-O-Al bending became progressively deeper with increased MgO *** of the Raman spectra showed that the average number of bridging oxygens per Si atom and the X_(Q^(3))/X_(Q^(2))(X_(Q^(i))is the molar fraction of Q^(i) unit,and i is the number of bridging oxygens in a[SiO_(4)]tetrahedral unit)ratio increased from 2.30 and 1.02 to 2.52 and 2.14,respectively,indicating a progressive polymerization of the silicate structure.X-ray photoelectron spectroscopy(XPS)results highlighted that non-bridging oxygen content decreased from 77.97mol% to 63.41mol% with increasing MgO concentration,whereas bridging oxygen and free oxygen contents *** analysis demonstrated a gradual increase in the polymerization degree of the tetrahedral structure with the increase in MgO ***,bond strength is another important factor affecting the slag *** occurrence of a viscosity minimum can be attributed to the complex evolution of bond strengths of non-bridging oxygens generated during depolymerization of the[SiO_(4)]and[AlO_(4)]tetrahedral structures by CaO and MgO.

关键词： aluminosilicate viscosity structure spectroscopy

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Mechanism of primary Si and Fe-segregation for a hypereutectic 90 wt.%Si-Ti alloy melt in directional solidification via electromagnetism

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Journal of Iron and Steel Research International 2023年第4期30卷 726-735页

作者： Kui-song Zhu Li Cao Ying-tao Zhao Jun Wang Xiang-kui Cheng college of vanadium and titanium Panzhihua UniversityPanzhihua 617000SichuanChina

The electromagnetic directional solidification(DS)phase separation experiments of high silicon 90 wt.%Si–Ti alloy were performed under various pulling-down *** results showed that Si enriched layer,Si+TiSi_(2)-rich layer and Si–Ti–Fe alloy layer appeared successively in axial direction of ingot after electromagnetic DS of 90 wt.%Si–Ti alloy melt at different pulling-down *** of primary Si and segregation mechanism of metal impurities(Fe)during the electromagnetic DS process were controlled by pulling-down speed of ingot and electromagnetic *** pulling-down speed was 5μm/s,minimum thickness of the Si enriched layer was 29.4 mm,and the highest content of primary Si in this layer was 92.46 wt.%;meanwhile,the highest removal rate of Fe as metal impurity was 92.90%.The type of inclusions in the Si enriched layer is determined by Fe content of segregated Si enriched *** the pulling-down speed was 5μm/s,the inclusions in the Si enriched layer were TiSi_(2).Finally,when the pulling-down speed reached greater than 5μm/s,the inclusions in the Si enriched layer evolved into TiSi_(2)+τ_(5).

关键词： High silicon Si-Ti alloy Primary Si Electromagnetic directional solidification Si enriched layer Impurity segregation

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

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

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

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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Effect of titanium content on the precipitation behavior of carbon-saturated molten pig iron

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International Journal of Minerals,Metallurgy and Materials 2019年第4期26卷 483-492页

作者： Lei-zhang Gao Tong-xiang Ma Meng-jun Hu Zhi-ming Yan Xue-wei Lü Mei-long Hu college of Materials Science and Engineering Chongqing University Chongqing Key Laboratory of vanadium-titanium Metallurgy and New Materials

The use of iron ores bearing titanium as a raw material is an effective measure to prevent hearth erosion and prolong the life of a blast furnace. In this research, the effect of titanium content on the precipitation behaviors of high-melting phases of carbon-saturated molten pig iron were studied by confocal scanning laser microscopy. The results showed that, when the titanium content was less than 0.25 wt%,Fe_3C was precipitated as a single phase from the molten carbon-saturated iron. The growth rate of the precipitated Fe_3C crystals was very high, reaching 7387 μm^2/s. When the titanium content in the molten pig iron was greater than 0.47 wt%, TiC crystals precipitated first. The shape and size of the precipitated TiC crystals did not obviously change. After TiC was precipitated, the fluidity of the molten pig iron worsened. With a decrease in temperature, Fe_3C was also precipitated but the growth rate of Fe_3C was limited by the presence of the first precipitated TiC phase. The crystal size of the precipitated Fe_3C was much smaller than that of pure Fe_3C.

关键词： carbon-saturated molten pig iron precipitation behavior titanium titanium carbide confocal scanning laser microscopy

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First-principles study of structural,electronic,elastic,and thermal properties of Imm2-BC

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Chinese Physics B 2019年第1期28卷 323-329页

作者： Qiang Li Zhen-Ling Wang Yu-Cheng Yu Lan Ma Shao-Li Yang Hai-Bo Wang Rui Zhang college of vanadium and titanium Panzhihua University Condensed Matter Science and Technology Institute and Department of Physics Harbin Institute of Technology

Using the first-principles method, we predict an orthorhombic boron–carbon binary structure with sp^ace group *** structure is verified to be dynamically and mechanically stable, and possesses a cavity of 27.5 ~2 that makes it a potential molecular sieve material. The C sp^2 and sp^3 hybridized bonding in Imm2 BC is an important factor for its structural stability. The energy band calculations reveal that Imm2 BC is a semiconductor with a band gap of 1.3 eV and has a promising application in the electro-optic field. The lattice thermal conductivity along the crystal [100] direction at room temperature is 186 W·m^(-1)·K^(-1), that is about 5 times higher than those along the [010] and [001] directions, which stems from the different group velocity along the crystal direction. Moreover, the acoustic-optical coupling is important for heat transp^ort in Imm2 BC, and the contribution of optical phonons to lattice thermal conductivity in the [100], [010], and [001]directions is 49%, 59%, and 61%, resp^ectively. This study gives a fundamental understanding of the structural, electronic,elastic, and heat transp^ort properties in Imm2 BC, further enriching the family of boron–carbon binary compounds.

关键词： first principles boron–carbon binary electronic structure thermal properties

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A polyphenol-induced hydroxyapatite coating modulates corrosion resistance and biocompatibility of magnesium alloys

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Biosurface and Biotribology 2023年第4期9卷 129-141页

作者： Tao Chai Hao Zhang Xiaolong Shen Haibo Wang Xingping Fan Binbin Wang Dingying He Jia Su Institute of vanadium and titanium Panzhihua UniversityPanzhihuaChina Engineering Technology Research Center of vanadium and titanium Materials Panzhihua UniversityPanzhihuaChina college of Biology&Chemical Engineering(Agricultural college) Panzhihua UniversityPanzhihuaChina

In order to solve the problem of excessive degradation rate and insufficient biocom-patibility of magnesium-based bone implants,a polyphenol(EGCG)induced hydroxy-apatite(HA)coating was prepared on the surface of AZ31 *** physical and chemical properties and corrosion resistance of the coating were analysed in depth,and its biocompatibility was preliminarily explored in *** results showed that the polyphenol(EGCG)conversion coating constructed on the AZ31 could successfully induce the formation of HA by complexing the phenolic hydroxyl group with calcium *** electrochemical and long-term immersion experiments showed that the corrosion resistance of EGCG/HA composite coating was significantly *** self-corrosion current density,hydrogen evolution and the increase of pH value of AZ31-EGCG/HA were significantly lower than those of *** the basis of inhibiting the excessive corrosion of the substrate,the composite coating significantly improves the compatibility of pre-osteoblasts,supports the adhesion and spreading and effectively reduces the haemolysis rate to less than 5%.The preparation method of the coating is simple,low cost and suitable for complex shape surfaces,which can significantly improve the corrosion resistance and biocompatibility of the AZ31 *** is expected to provide a solution for the surface modification of magnesium-based bone implants.

关键词： attrition-corrosion biocompatibility

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Properties and structure of a new non-reactive mold flux for high-Al steel

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Journal of Iron and Steel Research International 2022年第1期29卷 61-70页

作者： Yang Chen Sheng-ping He Zhi-rong Li Xu-bin Zhang Qiang-qiang Wang Qian Wang college of Materials Science and Engineering Chongqing Key Laboratory of Vanadium–Titanium Metallurgy and Advanced MaterialsChongqing UniversityChongqing 400044China

During the conventional continuous casting process of high-aluminum steels(w([Al])>0.5 wt.%),some components of slag,such as SiO_(2),B_(2)O_(3),and TiO_(2),could be reduced by aluminum in molten ***,the CaO-BaO-Al_(2)O_(3)-CaF2-Li2O non-reactive mold fluxes were designed using the simplex grid method and molecular dynamics to mitigate the slag-metal interface reaction and stabilize the performance of mold *** results show that the components of nonreactive quinary system are 20-40 wt.% CaO,14-34 wt.% BaO,14-34 wt.% Al_(2)O_(3),4-12 wt.% F,and 4-8 wt.% Li_(2)*** dynamics simulation results show that[AlO_(4)]-tetrahedron acts as network formers and melt network structure is mainly chain and lamellar in the low-viscosity *** cross sections of w(F)=8 wt.%,w(Li_(2)O)=8 wt.%and w(F)=12 wt.%,w(Li2O)=8 wt.% are important reference sections for the design of mold flux,with the compositions of 22-40 wt.%CaO,14-34 wt.% BaO,20-34 wt.%Al_(2)O_(3) and 23-40 wt.%CaO,14-34 wt.%BaO,20-28 wt.% Al_(2)O_(3),respectively.

关键词： Lightweight steel Non-reactive mold flux Molecular dynamics Viscosity Simplex grid method

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Three Complexes Based on Synthetic-condition Strategy Involving a Universal Mixed-ligand System

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Chinese Journal of Structural Chemistry 2019年第1期38卷 117-127,4页

作者： WANG Xiao-Fang ZHANG Hong HUO Hong-Ying YAN Yue-E LI Guo-Wei State Key Laboratory of titanium and vanadium Testing Panzhihua University Northeast Normal University

Three coordination polymers([Zn(H_2biim)_2(H_2O)_2]_2·2(HO-BDC)·x(H_2O)(1)[Cd(H_2biim)_2(H_2O)_2]_2·2(HO-BDC)·x(H_2O)(2) and [Co(HO-BDC)(bbi)]n(3)) are obtained by using synthetic-condition strategy in the mixed-ligand system 5-hydroxyisophthalic acid(OH-BDC)together with bisimidazole ligands(2,2?-biimidazole(H2 biim) and 1,1?-(1,4-butanediyl)bis(imidazole)(bbi)). The structure determination reveals that complexes 1 and 2 are zero-dimensional(0 D) structures, and complex 3 is a dinuclear two-dimensional(2D) layer structure. They are all 3D supramolecular networks. The comparisons of the synthetic-condition effects and structure differences among 1 ～3 and our previous work complexes 4([Co_2(HO-BDC)_2(bbi)_2]·H_2O) and 5([Zn(HO-BDC)(bbi)]) have been discussed in detail. Furthermore, the luminescent properties and thermal stabilities of compounds 1～3 in the solid state have been studied.

关键词： luminescent property crystal structure hydrothermal synthesis 5-hydroxyisophthalic acid

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Correlation between longitudinal crack occurrence and mold heat transfer in continuous casting based on process data mining

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Journal of Iron and Steel Research International 2024年第5期31卷 1139-1152页

作者： Zhi-qiang Peng Zi-bing Hou Kai Yi Kun-hui Guo Dong-wei Guo Guang-hua Wen college of Materials Science and Engineering Chongqing UniversityChongqing400044China Chongqing Key Laboratory of vanadium-titanium Metallurgy and New Materials Chongqing UniversityChongqing400044China

The correlation between the longitudinal crack occurrence and integrated heat transfer of the mold with data mining methods was ***,three kinds of support vector machine models based on principal component analysis with different input features were established to explore the effect of integrated heat transfer on the accuracy of the prediction model for the longitudinal *** results show that the accuracy was improved while features including mean and standard deviation of integrated heat transfer were ***,the difference in integrated heat transfer between defect and normal samples under the same process parameters was quantitatively *** with normal samples,the temperature difference of cooling water for defect samples decreased by 0.65%,and the temperature difference fluctuation increased by 31.1%.Finally,the literature data were used to provide support for the quantitative correlation according to defect formation mechanism.A new criterion for the prediction of longitudinal crack and a discovering method for correlation between product quality and process parameters in the manufacturing industry have been provided.

关键词： Continuous casting slab Longitudinal surface crack Heat transfer Data mining Quantitative correlation

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Effects of process parameters on the growth behavior and granule size distribution of iron ore mixtures in a novel high-shear granulator

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International Journal of Minerals,Metallurgy and Materials 2022年第12期29卷 2152-2161页

作者： Yang You Jiabao Guo Gang Li Zhuang Zheng Yong Li Xuewei Lü college of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of vanadium–titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China

This work proposes a novel horizontal high-shear granulator for iron ore granulation before sintering *** granulation behavior such as growth process and structure of granules were firstly analyzed,followed by the effects of operation conditions such as water content,initial particle size distribution,and the concentrate *** results show that the granule size increased significantly with increasing the granulation time,and the structure of granule can be divided into three types:non-nuclei,single-nuclei,and *** promotes the coalescence and growth of particles,and a better granulation performance was obtained at the water content of 8.8wt%under the current raw material *** the nuclei particle ratio led to an increase in average size of granules and permeability of the granules bed,but a decrease in growth ***,with increasing of concentrate ratio,granulation performance such as granule size,bed permeability,and uniformity became worse.

关键词： horizontal high-shear granulation iron ore granule structure granulation performance size distribution

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