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Layered Mg-Al spinel supported Ce-Fe-Zr-O oxygen carriers for chemical looping reforming

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Chinese Journal of Chemical Engineering 2020年第10期28卷 2668-2676页

作者： Jiangyong Yuan Yannan Zhao Haiwen Xu Chunqiang Lu Kun Yang Xing Zhu Kongzhai Li State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China

A series of layered Mg-Al spinel supported Ce-Fe-Zr-O oxygen carriers were prepared for co-production of syngas and pure hydrogen via chemical looping steam reforming(CLSR).The presence of magnesium-aluminum layered double oxides(Mg Al-LDO)significantly increases the specific surface area of the mixed oxides,reduces the particle size of CeO2-based solid solution and promotes the dispersion of free *** reacting with methane,Mg Al-LDO supported oxygen carrier shows much lower temperature for methane oxidation than the pure CeFe-Zr-O sample,indicating enhanced low-temperature *** different Ce-Fe-Zr-O(x)/Mg Al-LDO samples,the Ce-Fe-Zr-O(40 wt%)/Mg Al-LDO sample shows the best performance for the selective oxidation of methane to syngas and the H2 production by water *** a long period of high temperature redox experiment,the Ce-Fe-Zr-O(40 wt%)/Mg Al-LDO oxygen carrier still shows high activity for syngas *** comparison on the morphology of the fresh and cycled oxygen carriers indicates that the Mg-Al spinel support still forms a stable skeleton structure with high dispersion of active components on the surface after the long-term cycling,which contributes to excellent redox stability of the Ce-Fe-Zr-O(40 wt%)/Mg Al-LDO oxygen carrier.

关键词： Chemical looping reforming Syngas Hydrogen Ce-Fe-Zr-O(x)/MgAl-LDO Oxygen carrier

Stability, electronic structures, and mechanical properties of Fe–Mn–Al system from first-principles calculations

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Chinese Physics B 2017年第3期26卷 441-452页

作者：刘亚会种晓宇蒋业华冯晶 Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 China

The stability, electronic structures, and mechanical properties of the Fe-Mn-Al system were determined by firstprinciples calculations. The formation enthalpy and cohesive energy of these Fe-Mn-Al alloys are negative and show that the alloys are thermodynamically stable. Fe3Al, with the lowest formation enthalpy, is the most stable compound in the Fe-Mn-Al system. The partial density of states, total density of states, and electron density distribution maps of the Fe-Mn-Al alloys were analyzed. The bonding characteristics of these Fe-Mn-Al alloys are mainly combinations of covalent bonding and metallic bonds. The stress-strain method and Voigt-Reuss-Hill approximation were used to calculate the elastic constants and moduli, respectively. Fe2.5Mn0.5Al has the highest bulk modulus, 234.5 GPa. ***1.5Al has the highest shear modulus and Young＇s modulus, with values of 98.8 GPa and 259.2 GPa, respectively. These Fe-Mn-Al alloys display disparate anisotropies due to the calculated different shape of the three-dimensional curved surface of the Young＇s modulus and anisotropic index. Moreover, the anisotropic sound velocities and Debye temperatures of these Fe-Mn-Al alloys were explored.

关键词： density functional theory electronic structures mechanical properties anisotropy

Arsenic removal from acidic industrial wastewater by ultrasonic activated phosphorus pentasulfide

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Chinese Journal of Chemical Engineering 2023年第8期60卷 46-52页

作者： Bo Yu Guang Fu Xinpei Li Libo Zhang Jing Li Hongtao Qu Dongbin Wang Qingfeng Dong Mengmeng Zhang Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China Kunming Key Laboratory of Special Metallurgy Kunming University of Science and TechnologyKunming 650093China Key Laboratory of Unconventional Metallurgy Ministry of EducationKunming 650093China Yunnan Chihong Zn&Ge Co. LtdQujing 655011China

Arsenic is one of the main harmful elements in industrial *** to remove arsenic has always been one of the research hotspots in academic *** the process of arsenic removal by traditional sulfuration,the use of traditional sulfurizing agent will introduce new metal cations,which will affect the recycling of *** this study,phosphorus pentasulfide (P_(2)S_(5)) was used as sulfurizing agent,which hydrolyzed to produce H_(3)PO_(4) and H_(2)S without introducing new metal *** effect of ultrasound on arsenic removal by P_(2)S_(5) was *** the action of ultrasound,the utilization of P_(2)S_(5) was improved and the reaction time was *** effects of S/As molar ratio and reaction time on arsenic removal rate were investigated under ultrasonic *** enhanced heat and mass transfer so that the arsenic removal rate of 94.5%could be achieved under the conditions of S/As molar ratio of 2.1:1 and reaction time of 20 *** the first 60 min,under the same S/As molar ratio and reaction time,the ultrasonic hydrolysis efficiency of P_(2)S_(5) was *** is because P_(2)S_(5) forms ([(P_(2)S_(4))])^(2+)under the ultrasonic action,and the structure is damaged,which is easier to be *** addition,the precipitation after arsenic removal was characterized and analyzed by X-ray diffraction,scanning electron microscope-energy dispersive spectrometer,X-ray fluorescence spectrometer and X-ray photoelectron *** research avoids the introduction of metal cations in the arsenic removal process,and shortens the reaction time.

关键词： Arsenic removal Mass transfer Precipitation Waste water Ultrasound

Gas-rigid-flexible compound blade coupling enhanced experimental study on chaotic mixing of multiphase flow

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Particuology 2024年第11期94卷 356-372页

作者： Yan Zhang Xinyu Li Gai Zhang Mingyang Fan Jianxin Xu Hua Wang Faulty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming650093China State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming650093China

Efficient fluid mixing is essential for process *** study proposes a new method in which gas-rigid-flexible composite blades are coupled to enhance chaotic mixing in multiphase flow *** rigidity and flexibility of the blades were adjusted by intermittent gas injection,which increased the effectiveness of mixing of the liquid-liquid two-phase *** study investigates the influence of different process parameters on the mixing efficiency and quantifies the chaotic characteristics of fluid mixing through pressure-time series analysis of multiscale entropy and the 0–1 test.A high-speed camera recorded the bubble movement in the flow field,while particle image velocimetry(PIV)revealed the enhancement of the properties of the flow field in the system due to the suspended motion of the *** suitable process parameters,gas-rigid-flexible composite blade coupling significantly enhanced the mixing effect,where the mixing time of the G-RFCP system was reduced by 1.42 times compared to that of the CP *** motion,deformation,and rupture enhanced the mechanical agitation,increasing the intensity of the turbulence and chaotic ***-field analysis indicated a three-fold increase in the vorticity and a 1.04-fold increase in the velocity difference for the G-RFCP system compared with those of the CP *** study provides theoretical and experimental foundations for understanding chaotic mixing in liquid-liquid two-phase fluids.

关键词： Rigid-flexible compound blades Tracer particle Bubble dynamics Multiphase flow Chaotic mixing characteristics

Preparation of Perovskite-Type Oxides La_(1-x)Sr_xFe_(1-y)Co_yO_3 Using EDTA Sol-Gel Method

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Journal of Rare Earths 2004年第6期22卷 766-770页

作者：于洁马文会王华 Faculty of Materials and Metallurgical Engineering Kunming University of Science and Technology Kunming 650093 China

Two series of perovskite-type oxides with composition (La_(1-x))Sr_xFeO_3(x≤0.8)and La_(1-x)Sr_xFe_(1-y)Co_yO_3(x=0.2; y=0.2, 0.4)powder productions were synthesized by EDTA complexing sol-gel method. The products were characterized by XRD, TEM, SEM, BET method(N_2 adsorption)and laser granularity analysis for different synthesis conditions to obtain the optimum conditions for the preparation process. Single-phased, uniform perovskite-type oxides with small particle size were obtained by EDTA sol-gel process with high stability and repeatability, and the process temperature is much lower than that of solid state reaction method.

关键词： perovskite La_(1-x)Sr_xFe_(1-y)Co_yO_3 EDTA sol-gel method preparation process rare earths

Study on Separation of Pb and Zn from Mixed Rougher Concentrates

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Journal of Rare Earths 2004年第S1期22卷 33-39页

作者：张桂芳张宗华 College of Land Resources Engineering Kunming University of Science and Technology Kunming 650093 China

The compositions of Pb and Zn mixed rougher concentrates were studied. The process utilizes flotation and gravity flow sheet to separate Pb or Zn. Pb and Zn in the tailings were reclaimed by gravity more efficiently. This test used an ion-wave shaking table developed by Kunming University of Science and Technology. Based on the test results, the optimum test condition was chosen and testing of synthetic condition was performed. The results show that the process produces a final Zn concentrate with a 42.16% grade and 79.64% recovery and a final Pb concentrate with a 46.52% grade and 78.41% recovery.

关键词： ore dressing Pb-Zn separation floatation-gravity separation rare earths

Green Effectively Enhanced Extraction to Produce Yttrium(Ⅲ)in Slug Flow Microreactor

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Chinese Journal of Chemistry 2020年第5期38卷 471-477页

作者： Yuan He Shenghui Guo Kaihua Chen Shiwei Li Shaohua Yin Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunmingYunnan 650093China State Key Laboratory of complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunmingYunnan 650093China Kunming Key Laboratory of Special Metallurgy KunmingYunnan 650093China

Process reinforcement research was carried out in Y-junction slug flow microreactors under variable conditions,using EHEHPA(2-ethylhexyl phosphonic acid mono-2-ethylhexyl)to extract yttrium(Ⅲ)from hydrochloric acid *** influence of pH and flow rate on the extraction-reaction efficiency,slug size,mass transfer performance was *** experimental results showed that maximum extraction-reaction efficiency of 91.85%can be achieved in the smallest microreactor(residence time is 11.25 s),which was significantly higher than traditional extraction requiring more than 10 *** slug length tended to decrease with the increase of pH and flow *** mass transfer coefficients for the slug flow microreactors were found to be in the range of 1.39×10^-1-1.642s^-1 that is several orders of magnitude higher as compared to traditional extractors,which testified the beneficial effects of Y-junction slug flow *** mass transfer reinforcement has prompted the use of microreactor as a suitable alternative to traditional extractors,which can advantageously improve the economic and environmental development of mineral processing.

关键词： Slug assessed (Ⅲ)

Enhancement of solar-driven photocatalytic activity of oxygen vacancy-rich Bi/BiOBr/Sr_(2)LaF_(7)∶Yb^(3+),Er^(3+)composites through synergetic strategy of upconversion function and plasmonic effect

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Journal of Environmental Sciences 2022年第5期34卷 76-87页

作者： Yongjin Li Yingying Zhang Jiajing Wang Youzhun Fan Taizhong Xiao Zhaoyi Yin Tianhui Wang Jianbei Qiu Zhiguo Song School of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

For better use of solar energy,the development of efficient broadband photocatalyst has attracted extraordinary *** this study,a ternary composite consisting of Sr_(2)LaF_(7)∶Yb^(3+),Er^(3+)upconversion(UC)nanocrystals and Bi nanoparticles loaded BiOBr nanosheets with oxygen vacancies(OVs,SLFBB)was designed and synthesized by multi-step solvent-thermal *** of in-situ formation of Bi nanoparticles and OVs in BiOBr/Sr_(2)LaF_(7)∶Yb^(3+),Er^(3+)composites(SFLB)are *** Bi metal and OVs enhanced the light-harvesting capacity in the region of visible-near-infrared(Vis-NIR),and promoted the separation of electron-hole(e-/h+)***,the surface plasmon resonance(SPR)effect of Bi metal can improve the energy transfer from Sr_(2)LaF_(7)∶Yb^(3+),Er^(3+)to BiOBr via nonradiative energy transfer process,resulting in enhancing the light utilization from up-converting NIR into Vis *** to the synergistic effects of UC function,SPR and OVs,the SFLBB exhibited obviously enhanced photocatalytic ability for the degradation of BPA with a rate of 8.9×10^(-3) min^(-1),which is about 2.78 times higher than 3.2×10^(-3) min^(-1) of BiOBr(BOB)under UV-Vis-NIR light *** work provides a novel strategy for the project of high-efficiency Bismuth-based broadband photocatalysts,which is helpful to fur-ther understand the mechanism of enhanced photocatalysis by UC function and plasmonic effect.

关键词： BiOBr/Sr_(2)LaF_(7)∶Yb^(3+),Er^(3+)composites In-situ generation Bi metal Oxygen vacancies Broadband photocatalysis

Adsorption of sodium oleate at the microfine hematite/aqueous solution interface and its consequences for flotation

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International Journal of Mining Science and Technology 2023年第1期33卷 105-113页

作者： Shaojun Bai Jie Li Yunxiao Bi Jiaqiao Yuan Shuming Wen Zhan Ding State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China Faculty of Land Resource Engineering Kunming University of Science and TechnologyKunming 650093China

The adsorption of sodium oleate(NaOL)at the microfine hematite/aqueous solution interface was investigated in this *** research indicated that negative effects stemmed from the dissolution of the microfine hematite(D50=19.21μm)could be effectively eliminated via the appropriate dosage of NaOL at alkali pH *** chemistry calculation and adsorption test results indicated that RCOOand(RCOO)_(2)^(2-) ions were responsible for microfine hematite flotation at pH *** potential and FTIR measurements confirmed the co-adsorption of molecular and ionic oleate species occurred at pH 8.2.X-ray photoelectron spectroscopy(XPS)results further indicated that oleate species interacted with hematite surfaces mainly through chemisorption,giving rise to molecule/colloid formation of oleate and Fe―OL complex ***-of-flight secondary ion mass spectrometry(ToF-SIMS)results demonstrated that oleate species adsorbed onto the hematite surfaces with a thickness of a few ***,the normalized peak intensity of C4H7+ions on the hematite sample at pH 8.2 increased remarkably comparing with corresponding result of hematite sample at pH *** new findings of the present study well revealed the dissolution of microfine hematite and the pH effects on the hematite flotation,as well as the adsorption characteristics of oleate species.

关键词： Microfine hematite Oleate species Chemisorptions Dissolution ToF-SIMS