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Xuefeng She
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, 100083, Beijing, China

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Journal article
Published: 25 August 2021 in Ceramics International
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Raman spectroscopy and differential scanning calorimetry were employed to investigate the structure, crystallization behavior and crystallization activation energy of the La2O3–CaO–SiO2–CaF2 (RE) slags with different RE contents. Raman spectroscopy analysis indicated that the RE oxide, La2O3, acted as a network modifier, with the increase in La2O3 content decreasing the degree of polymerization of the RE slag. As the La2O3 content increased, the number of highly polymerized Q2 and Q3 species gradually decreased, while the minimally polymerized Q0 and Q1 species increased, and depolymerizing the complex network structure in the slag. The slag mainly contained the following three crystal phases: (Ca, La)5(SiO4)6F, CaSiO3, and Ca4Si2O7F2. When the La2O3 content increased to 15%, an additional Ca2SiO2F2 crystalline phase appeared. Furthermore, an increase in the La2O3 content from 10 to 17% reduced the crystallization temperature of the RE phase in the slag from 1641 to 1599K. The crystallization behavior of the RE phase under different cooling rates revealed that the increase in La2O3 content reduced the effective crystallization activation energy of the RE phase, thus enhancing the crystallization of the RE phase. Thus, a correlation between the structure and crystallization of the RE slag was established.

ACS Style

Xuefeng She; Huai Zhang; Zhenlong An; Jingsong Wang; Qingguo Xue. Structure and crystallization of glassy La2O3–CaO–SiO2–CaF2 system rare-earth slag with variable rare-earth content. Ceramics International 2021, 1 .

AMA Style

Xuefeng She, Huai Zhang, Zhenlong An, Jingsong Wang, Qingguo Xue. Structure and crystallization of glassy La2O3–CaO–SiO2–CaF2 system rare-earth slag with variable rare-earth content. Ceramics International. 2021; ():1.

Chicago/Turabian Style

Xuefeng She; Huai Zhang; Zhenlong An; Jingsong Wang; Qingguo Xue. 2021. "Structure and crystallization of glassy La2O3–CaO–SiO2–CaF2 system rare-earth slag with variable rare-earth content." Ceramics International , no. : 1.

Article
Published: 18 July 2021 in International Journal of Minerals, Metallurgy and Materials
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CaO-containing carbon pellets (CCCP) were successfully prepared from well-mixed coking coal (CC) and calcium oxide (CaO) and roasted at different pyrolysis temperatures. The effects of temperature, pore distribution, and carbon structure on the compressive strength of CCCP was investigated in a pyrolysis furnace (350–750°C). The results showed that as the roasting temperature increased, the compressive strength also increased and furthermore, structural defects and imperfections in the carbon crystallites were gradually eliminated to form more organized char structures, thus forming high-ordered CC. Notably, the CCCP preheated at 750°C exhibited the highest compressive strength. A positive relationship between the compressive strength and pore-size homogeneity was established. A linear relationship between the compressive strength of the CCCP and the average stack height of CC was observed. Additionally, a four-stage caking mechanism was developed.

ACS Style

Xiao-Min You; Xue-Feng She; Jing-Song Wang; Qing-Guo Xue; Ze-Yi Jiang. Preparation of CaO-containing carbon pellets from coking coal and calcium oxide: Effects of temperature, pore distribution and carbon structure on compressive strength in pyrolysis furnace. International Journal of Minerals, Metallurgy and Materials 2021, 28, 1153 -1163.

AMA Style

Xiao-Min You, Xue-Feng She, Jing-Song Wang, Qing-Guo Xue, Ze-Yi Jiang. Preparation of CaO-containing carbon pellets from coking coal and calcium oxide: Effects of temperature, pore distribution and carbon structure on compressive strength in pyrolysis furnace. International Journal of Minerals, Metallurgy and Materials. 2021; 28 (7):1153-1163.

Chicago/Turabian Style

Xiao-Min You; Xue-Feng She; Jing-Song Wang; Qing-Guo Xue; Ze-Yi Jiang. 2021. "Preparation of CaO-containing carbon pellets from coking coal and calcium oxide: Effects of temperature, pore distribution and carbon structure on compressive strength in pyrolysis furnace." International Journal of Minerals, Metallurgy and Materials 28, no. 7: 1153-1163.

Journal article
Published: 03 March 2021 in Ironmaking & Steelmaking
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The dynamic blockage behaviour of fine particles in a packed bed was simulated using the discrete element method (DEM). The influence of key variables are examined. The calculation results showed that fine particles blockage in packed bed are easy to occur in the area where fine particles just enter the bed. The mechanism of blockage formation is mainly due to mechanical interactions between fine particles, which can create arches on packed bed and stop the flow. When the fine particles form a bridge across the pore throat of the orifice, the bottleneck of void space becomes the starting point for blockage formation. The fine particles with a larger rolling friction coefficient have a higher clogging ratio. With the increase in charging fine particles, the fine particles experience more collisions with each other, and the clogging ratio increases. The initial velocity of fine particles also has an impact on the blockage behaviour.

ACS Style

Xuefeng She; Songhao Liu; Yanjun Liu; Wenshu Zhao; Yanjiang Wang; Heng Zhou. Dynamic analysis of blockage behavior of fine particles in a packed bed by discrete element method. Ironmaking & Steelmaking 2021, 1 -8.

AMA Style

Xuefeng She, Songhao Liu, Yanjun Liu, Wenshu Zhao, Yanjiang Wang, Heng Zhou. Dynamic analysis of blockage behavior of fine particles in a packed bed by discrete element method. Ironmaking & Steelmaking. 2021; ():1-8.

Chicago/Turabian Style

Xuefeng She; Songhao Liu; Yanjun Liu; Wenshu Zhao; Yanjiang Wang; Heng Zhou. 2021. "Dynamic analysis of blockage behavior of fine particles in a packed bed by discrete element method." Ironmaking & Steelmaking , no. : 1-8.

Original research article
Published: 26 February 2021 in Metallurgical and Materials Transactions A
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Isothermal reduction experiments at 1400 °C, which used carbon-bearing pellets mainly made from Bayan Obo complex iron ore and pulverized coal, could effectively separate rare earth (RE) slag and iron. Different instruments were used to study the precipitation of RE slag and the growth behavior of the RE phase in RE slag during the process of cooling from 1400 °C. The experimental results show the presence of three main phases in the RE slag—the RE phase (Ca, Ce, La)5(SiO4)6F, cuspidine (Ca4Si2O7F2), and fluorite (CaF2), which precipitated at 1352 °C, 1218 °C, and 1045 °C, respectively. The RE phase grew along a specific growth track and finally manifested with a hollow hexagon morphology. The edge nucleation layer-by-layer growth model was applied to explain the formation of the hollow crystal structure. Further, the growth kinetics of the RE phase formation from molten slag were also described.

ACS Style

Wanli Yi; Xuefeng She; Huai Zhang; Zhenlong An; Jingsong Wang; Qingguo Xue. Precipitation of Rare Earth Slag and the Crystallization Behavior of Rare Earth Phase. Metallurgical and Materials Transactions A 2021, 1 -11.

AMA Style

Wanli Yi, Xuefeng She, Huai Zhang, Zhenlong An, Jingsong Wang, Qingguo Xue. Precipitation of Rare Earth Slag and the Crystallization Behavior of Rare Earth Phase. Metallurgical and Materials Transactions A. 2021; ():1-11.

Chicago/Turabian Style

Wanli Yi; Xuefeng She; Huai Zhang; Zhenlong An; Jingsong Wang; Qingguo Xue. 2021. "Precipitation of Rare Earth Slag and the Crystallization Behavior of Rare Earth Phase." Metallurgical and Materials Transactions A , no. : 1-11.

Paper
Published: 04 January 2021 in RSC Advances
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Developing electrocatalytic nanomaterials for green H2 energy is inseparable from the exploration of novel materials and internal mechanisms for catalytic enhancement.

ACS Style

Hai Zhong; Guofeng Cheng; Guangcai Ma; Enhui Wu; Zhuo Zhang; Xuefeng She; Shuqiang Jiao; Jingsong Wang; Qingguo Xue. N-doped mixed Co, Ni-oxides with petal structure as effective catalysts for hydrogen and oxygen evolution by water splitting. RSC Advances 2021, 11, 1022 -1029.

AMA Style

Hai Zhong, Guofeng Cheng, Guangcai Ma, Enhui Wu, Zhuo Zhang, Xuefeng She, Shuqiang Jiao, Jingsong Wang, Qingguo Xue. N-doped mixed Co, Ni-oxides with petal structure as effective catalysts for hydrogen and oxygen evolution by water splitting. RSC Advances. 2021; 11 (2):1022-1029.

Chicago/Turabian Style

Hai Zhong; Guofeng Cheng; Guangcai Ma; Enhui Wu; Zhuo Zhang; Xuefeng She; Shuqiang Jiao; Jingsong Wang; Qingguo Xue. 2021. "N-doped mixed Co, Ni-oxides with petal structure as effective catalysts for hydrogen and oxygen evolution by water splitting." RSC Advances 11, no. 2: 1022-1029.

Journal article
Published: 13 December 2020 in Metals
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One approach to reduce CO2 emission in the steelmaking industry is to recycle scrap to the blast furnace/basic oxygen furnace (BF/BOF) production system. This paper performed a numerical investigation on the BF operation with scrap charging. The investigated BF was with an inner volume of 820 m3, producing 2950 tons of hot metal per day (tHM/d). The simulated results indicated the following: Extra scrap addition in BF causes the decrease of shaft temperature, the decrease of local gas utilization, and the lowering of cohesive zone position, leading to an unstable BF running. The partial replacement of sinter with scrap in BF can mitigate the negative effects induced by scrap charging. The optimal scrap rate in the BF is 178 kg/tHM, under which the BF reaches a productivity of 3310 tHM/d, a top-gas utilization of 48.5%, and a top-gas temperature of 445 K. Compared to the base case, in the BF operation with scrap charging, the BF productivity is increased by 360 kg/tHM, its pulverized-coal rate and coke rate are decreased by 16.3 kg/tHM and 39.8 kg/tHM, respectively.

ACS Style

Zhu Liu; Zi Yu; Xuefeng She; Huiqing Tang; Qingguo Xue. Numerical Investigation of Blast Furnace Operation with Scrap Charging. Metals 2020, 10, 1666 .

AMA Style

Zhu Liu, Zi Yu, Xuefeng She, Huiqing Tang, Qingguo Xue. Numerical Investigation of Blast Furnace Operation with Scrap Charging. Metals. 2020; 10 (12):1666.

Chicago/Turabian Style

Zhu Liu; Zi Yu; Xuefeng She; Huiqing Tang; Qingguo Xue. 2020. "Numerical Investigation of Blast Furnace Operation with Scrap Charging." Metals 10, no. 12: 1666.

Research articles
Published: 08 September 2020 in Ironmaking & Steelmaking
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The viscosities of high titanium containing slag with TiO2 ranging from 23 to 43 mass%, Al2O3 9 mass% and CaO/SiO2 ranging from 0.3 to 0.7 were experimentally determined by the rotating cylinder method. Experiments were conducted in the temperature range of 1573–1873 K. The effects of TiO2, basicity, and temperature on viscosity were studied. The experimental results indicated that above the liquidus temperatures, the viscosities decrease with TiO2 and basicity increasing. And increasing on CaO content should be more effective in depolymerizing slag structure and lowering viscosity compared to TiO2 addition. Moreover TiO2 behaved as a weak acid oxide in the experiment slags by XPS analysis. Based on the experimental data of CaO–SiO2–Al2O3–TiO2 quaternary system, the activation energy of viscous flow was calculated between 115 and 141 kJ mol−1 depending on the slag composition.

ACS Style

Huai Zhang; Hao-Yan Sun; Xue-Feng She; Jing-Song Wang; Qing-Guo Xue. Influence of TiO2 on the viscosity of the molten slag and the confirmation of the acid–base property on TiO2. Ironmaking & Steelmaking 2020, 48, 387 -392.

AMA Style

Huai Zhang, Hao-Yan Sun, Xue-Feng She, Jing-Song Wang, Qing-Guo Xue. Influence of TiO2 on the viscosity of the molten slag and the confirmation of the acid–base property on TiO2. Ironmaking & Steelmaking. 2020; 48 (4):387-392.

Chicago/Turabian Style

Huai Zhang; Hao-Yan Sun; Xue-Feng She; Jing-Song Wang; Qing-Guo Xue. 2020. "Influence of TiO2 on the viscosity of the molten slag and the confirmation of the acid–base property on TiO2." Ironmaking & Steelmaking 48, no. 4: 387-392.

Journal article
Published: 15 May 2020 in ISIJ International
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Crystallization behaviors of CaO–SiO2–CaF2–La2O3 synthesized slag with different basicity have been studied by differential scanning calorimetry (DSC), field emission scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was found that there were mainly three kinds of crystalline phases (La7.58(Si1.048O4)6O2, CaSiO3 and Ca4Si2O7F2) precipitated in the slag during the cooling process. Crystalline phase Ca2SiO3 formed when the basicity was increased to 1.3. The observations confirmed that the rare earth phase (La7.58(Si1.048O4)6O2) precipitated firstly in each slag during the cooling process. With the increase of slag basicity, the crystallization temperature of the rare earth phase decreases while the precipitation peak temperature of CaSiO3 and Ca4Si2O7F2 increase. The morphology of rare earth phase is hollow hexagonal which is filled with substrate phase. The optimum condition for crystallization and separation of rare earth phase was obtained. The basicity of the slag should be controlled between 0.9 and 1.1. The morphology of rare earth phases can grow much better after isothermal heat treatment for 4 h at the crystallization temperature of rare earth phases. The mean size of rare earth phase could increase to more than 60 µm by isothermal heat treatment.

ACS Style

Xuefeng She; Zhenlong An; Zhuo Zhang; Tengfei Ma; Jingsong Wang. Crystallization Behavior of Synthesized CaO–SiO2–CaF2–La2O3 Rare Earth-containing Slag. ISIJ International 2020, 60, 832 -839.

AMA Style

Xuefeng She, Zhenlong An, Zhuo Zhang, Tengfei Ma, Jingsong Wang. Crystallization Behavior of Synthesized CaO–SiO2–CaF2–La2O3 Rare Earth-containing Slag. ISIJ International. 2020; 60 (5):832-839.

Chicago/Turabian Style

Xuefeng She; Zhenlong An; Zhuo Zhang; Tengfei Ma; Jingsong Wang. 2020. "Crystallization Behavior of Synthesized CaO–SiO2–CaF2–La2O3 Rare Earth-containing Slag." ISIJ International 60, no. 5: 832-839.

Journal article
Published: 15 April 2019 in Metals
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In rotary hearth furnace (RHF) production, the heat transfer system will produce deposition, which blocks the exhaust channel. The formation of deposition will affect RHF production. In this study, the formation mechanism of deposition was determined through chemical composition analysis, XRD and SEM-EDS: the main cohered phase in the deposition was KCl and the secondary cohered phase was ZnFe2O4; the ZnFe2O4 had become solid since it was formed with a porous structure and it cohered other substances; the ZnFe2O4 exhibited stronger cohering strength than KCl, due to a different cohering mechanism. In contrast, the KCl played a significant role in the deposition on the heat exchanger wall. A new process was proposed to avoid the deposition formation. This process could eliminate the deposition in the heat transfer system of RHF and improve the utilization of metallurgical waste.

ACS Style

Yuzhu Pan; Xuefeng She; Jingsong Wang; Yingli Liu. Study of the Deposition Formation Mechanism in the Heat Exchanger System of RHF. Metals 2019, 9, 443 .

AMA Style

Yuzhu Pan, Xuefeng She, Jingsong Wang, Yingli Liu. Study of the Deposition Formation Mechanism in the Heat Exchanger System of RHF. Metals. 2019; 9 (4):443.

Chicago/Turabian Style

Yuzhu Pan; Xuefeng She; Jingsong Wang; Yingli Liu. 2019. "Study of the Deposition Formation Mechanism in the Heat Exchanger System of RHF." Metals 9, no. 4: 443.

Conference paper
Published: 13 February 2019 in Proceedings of the International Conference on Martensitic Transformations: Chicago
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In order to figure out the effect of chemical composition on the crystallization behaviour of rare earth phase in rare earth slag, the quaternary system SiO2–CaO–CaF2–Ce2O3 slags were made by pure chemical reagent at 1673 K in muffle furnace. The mineral phases and micromorphology of slags were detected by the X-ray diffraction and scanning electron microscope (SEM), respectively. The results show that grains of RE-containing mineral grow very well and the equivalent diameter of grains is about 100 μm when the basicity is about 1. The effect of CaF2 on the crystallization of the rare earth phase is complex. With the increase of basicity, the crystallization of the rare earth phase is increasing and the RE-concentrating phase exists in a rod-like structure. But when the alkalinity is up to 2.0, the distribution of RE-concentrating phase becomes dispersive and the crystals of rare earth phase have no definite shape. The major minerals are fluorite, cuspidine, RE-concentrating phase and substrate phase.

ACS Style

Tengfei Ma; Fu Feng; Xuefeng She; Jingsong Wang; Qingguo Xue. Effect of Chemical Composition on the Crystallization Behaviour of Rare Earth Phase in Slag. Proceedings of the International Conference on Martensitic Transformations: Chicago 2019, 443 -451.

AMA Style

Tengfei Ma, Fu Feng, Xuefeng She, Jingsong Wang, Qingguo Xue. Effect of Chemical Composition on the Crystallization Behaviour of Rare Earth Phase in Slag. Proceedings of the International Conference on Martensitic Transformations: Chicago. 2019; ():443-451.

Chicago/Turabian Style

Tengfei Ma; Fu Feng; Xuefeng She; Jingsong Wang; Qingguo Xue. 2019. "Effect of Chemical Composition on the Crystallization Behaviour of Rare Earth Phase in Slag." Proceedings of the International Conference on Martensitic Transformations: Chicago , no. : 443-451.

Conference paper
Published: 19 January 2018 in Proceedings of the International Conference on Martensitic Transformations: Chicago
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In this paper the direct reduction melting separation-leaching process is investigated on recovering rare earth from rare earth Bayan Obo complex iron ore (REBOCIO). The REBOCIO was reduced and melting separated to produce iron nugget and rare-earth-rich slag at 1400 °C for 12 or 15 min. The RE2O3 is enriched into Ce4.667(SiO4)O or Ca3Ce2[(Si,P)3O4]3F, which closely depend on chemical components, especially basic. The optimal acid-leaching parameters of rare earth elements from the rare earth slag are suggested as the hydrochloric acid concentration, the ratio of solid to liquid, leaching temperature, and the leaching time are 1 mol/L, 1:14, 50 °C and 120 min, respectively. The rare earth elements leaching efficiency are more than 95%. Adding of calcium CaCO3 and sodium Na2CO3 in direct reduction process have great influence on leaching efficiency of thorium.

ACS Style

Ma Tengfei; She Xuefeng; Feng Fu; Wang Jingsong. Study on Direct Reduction Melting Separation-Leaching Process of Disposal Rare Earth Composite Iron Ore. Proceedings of the International Conference on Martensitic Transformations: Chicago 2018, 413 -423.

AMA Style

Ma Tengfei, She Xuefeng, Feng Fu, Wang Jingsong. Study on Direct Reduction Melting Separation-Leaching Process of Disposal Rare Earth Composite Iron Ore. Proceedings of the International Conference on Martensitic Transformations: Chicago. 2018; ():413-423.

Chicago/Turabian Style

Ma Tengfei; She Xuefeng; Feng Fu; Wang Jingsong. 2018. "Study on Direct Reduction Melting Separation-Leaching Process of Disposal Rare Earth Composite Iron Ore." Proceedings of the International Conference on Martensitic Transformations: Chicago , no. : 413-423.

Journal article
Published: 24 August 2016 in ChemElectroChem
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Breakthroughs in efficient recycling for industrial slag and renewable energy have become global subjects of interest. In this study, rare earth oxide (REO) slag was used for the first time in photoelectrochemical (PEC) hydrogen generation by modifying the surface of a photoanode, which was constructed from RGO-covered [email protected] two-story hetero-nanostructures (HNSs) and thereby exhibited dramatically enhanced hydrogen generation. REO slag was extracted from REO iron ore via mimicking of the iron-making process, and whole HNSs prepared for PEC anode were synthesized by the hydrothermal method. Our studies demonstrated that the REO slag significantly promoted the growth of CdSe nanoparticles and could also be used as the OH- supplier to block hydrolysis of Na2S and Na2SO3 in the PEC electrolyte. Moreover, light absorption was fully facilitated by the two-story structure, and the photoconversion was enhanced via type II cascade band alignment of CdSe and ZnO. Additionally, the concentration of holes and efficient charge transfer by RGO can suppress electron-hole recombination and improve the electron lifetime. The current study presents a novel REO slag modified photoanode for high efficiency PEC devices and offers the possibility of recycling of industrial waste for renewable energy generation.

ACS Style

Xuefeng She; Zhuo Zhang; Minki Baek; Mingi Choi; Kijung Yong; Jing-Song Wang; Qing-Guo Xue. Recycling Rare-Earth Slag for Enhanced Photoelectro- chemical Efficiency of a Reduced Graphene Oxide-Covered [email protected] Hetero-Nanostructured Photoanode. ChemElectroChem 2016, 3, 1890 -1898.

AMA Style

Xuefeng She, Zhuo Zhang, Minki Baek, Mingi Choi, Kijung Yong, Jing-Song Wang, Qing-Guo Xue. Recycling Rare-Earth Slag for Enhanced Photoelectro- chemical Efficiency of a Reduced Graphene Oxide-Covered [email protected] Hetero-Nanostructured Photoanode. ChemElectroChem. 2016; 3 (11):1890-1898.

Chicago/Turabian Style

Xuefeng She; Zhuo Zhang; Minki Baek; Mingi Choi; Kijung Yong; Jing-Song Wang; Qing-Guo Xue. 2016. "Recycling Rare-Earth Slag for Enhanced Photoelectro- chemical Efficiency of a Reduced Graphene Oxide-Covered [email protected] Hetero-Nanostructured Photoanode." ChemElectroChem 3, no. 11: 1890-1898.