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Microstructure Evolution and Mechanism of Strength Development of Fly Ash Paste

Journal of Wuhan University of Technology(Materials Science) 2025年第1期 152-163页

作者：马庶钊 WU Shunchuan HUANG Mingqing 程海勇 JIANG Guanzhao NIU Yonghui LIU Zemin SUN Wei Faculty of Land Resources Engineering Kunming University of Science and Technology Zijin School of Geology and Mining Fuzhou University

Three types of activators such as sodium hydroxide,calcium oxide and triethanolamine （TEA） are used to establish different activation environments to address the problems associated with the process of activating fly ash *** conducted mechanical tests and numerical simulations to understand the evolution of microstructure,and used environmental scanning electron microscopy （ESEM） and energy dispersive spectroscopy （EDS） techniques to analyze the microenvironments of the *** mechanical properties of fly ash paste under different activation conditions and the changes in the microstructure and composition were *** results revealed that under conditions of low NaOH content （1%-3%）,the strength of the sample increased *** the content exceeded 4%,the rate of increase in strength *** on the results,the optimal NaOH content was identified,which was about 4%.A good activation effect,especially for short-term activation （3-7 d）,was achieved using TEA under high doping *** activation effect was poor for long-term strength after 28 *** CaO content did not significantly affect the degree of activation *** maximum effect was exerted when the content of CaO was 2%.The virtual cement and concrete testing laboratory （VCCTL） was used to simulate the hydration process,and the results revealed that the use of the three types of activators accelerated the formation of Ca（OH）2in the *** activators also corroded the surface of the fly ash particles,resulting in a pozzolanic *** active substances in fly ash were released efficiently,and hydration was *** pores were filled with hydration products,and the microstructure changed to form a new frame of paste filling that helped improve the strength of fly ash paste.

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Cooperative enhancement of mechanical and tribological properties through tailoring TiN transition interface in boron nitride nanosheets reinforced copper composites

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Rare Metals 2024年第10期43卷 5202-5215页

作者： Zhong-Hua Li Liang Liu Xin You Jian-Hong Yi Rui Bao Ming-Yi Zhu Song Lu Jun-Jun Pai Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Key Laboratory of Advanced Materials of yunnan Province Kunming University of Science and TechnologyKunming 650093China

Strengthening interface bonding between boron nitride nanosheets(BNNS)and copper matrix is an essential prerequisite for exploiting a new generation of copper matrix composites(CMCs)with high strength and wear ***,BNNS/Cu composites were fabricated by the powder metallurgy route,matrix-alloying(adding 1.0 wt%Ti)strategy was adopted to improve the interfacial wettability and strengthen interface adhesion.A typical"sandwich"-like multiply interface structure involving TiN transition layers,BNNS and Cu matrix had been well constructed through the rational heat treatment(900℃ for 120 min).Additionally,nano-sized TiB whisker was in situ formed in the vicinity of the interface,it had linked the BNNS-Cu-TiN multiply interface,which played a role of"threading the needle"and significantly strengthened the multi-interfaces *** specific interface structure was finely characterized,and the formation mechanism of solid-state interfacial reaction feature was *** results demonstrated that the ultimate tensile strength(UTS)of BNNS/Cu-(Ti)-900℃ increased from 248 to 530 MPa(increased by 114%),and the coefficient of friction(COF)decreased from 0.51 to 0.28 than pure *** work highlights the importance of interface configuration design,which contributes to the development of CMCs with prominent comprehensive properties.

关键词： Copper matrix composites Boron nitride nanosheets Interface structure Mechanical and frictional properties

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Effect of surface manganese oxide species on soot catalytic combustion of Ce-Mn-O catalyst

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Journal of Rare Earths 2022年第8期40卷 1238-1246页

作者： Yi Zhu Quan Wang Li Lan Shanhu Chen Jingjing Zhang College of Chemistry Biology and Environment Yuxi Normal UniversityYuxi 653100China College of Materials and Mechatronics Jiangxi Science and Technology Normal UniversityNanchang 330013China College of Chemistry and Chemical Engineering Jiangxi Science and Technology Normal UniversityNanchang 330013China

Constructing cerium and manganese bimetallic catalysts with excellent catalytic performance for soot combustion is the research frontier at *** order to find out the key factors for catalytic soot combustion of Ce-Mn-O catalysts,a series of Ce-Mn-O catalysts with different Ce/Mn proportions were prepared by co-precipitation *** activity test results show that it increases first and then decreases with the increase of Mn *** best catalytic activity is obtained for Ce_(0.64)Mn_(0.36) catalyst,which shows a maximum rate temperature(T_(m)) at 306℃ for CO_(2) production in TPO *** with non-catalytic soot combustion,the T_(m) decreases by mo re than 270℃.Syste matical characte rization results suggest that when the adsorbed surface oxygen,lattice oxygen,specific surface area and total reduction amount of the catalysts reach a certain value,the key factors leading to the difference of catalytic activity become the readily reducible and highly dispersed surface manganese oxide species and contact performance of the external *** surface manganese oxide species is beneficial to improving the low-temperature reducibility of catalysts and the porous surface is conducive to the contact between catalyst and ***,for the soot combustion reaction containing only O_(2),the promoting effect of Mn^(4+)is not obvious.

关键词： Ce-Mn-O catalyst Soot catalytic combustion Surface manganese oxides Contact performance Diesel pollution control Rare earths

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ZnO/ZnS heterostructure in N-doped porous carbon for anchoring-diffusion-conversion of polysulfides for high-performance lithium-sulfur batteries

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Rare Metals 2024年第8期43卷 3661-3676页

作者： Fei Wang Rong-Wei Huang Wen-Chang Han Chun-Man Yang Wen-Hao Yang Peng Dong Chao-Ling Wu Yi-Yong Zhang Xue Li Ying-Jie Zhang National Local Joint Engineering research Center for LithiumIon Batteries and Materials Preparation Technology Key Laboratory of Advanced Batteries Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093China Engineering research Center of Alternative Energy Materials and Devices Sichuan UniversityMinistry of EducationChengdu 610065China

The shuttle effect of polysulfides is one of the key factors hindering the commercialization of lithiumsulfur batteries(LSBs).Owing to their high conductivity and advantageous structure,heterostructures can be used in sulfur fixation and catalysis of *** this study,a flower-shaped ZnO/ZnS heterostructure on a nitrogendoped porous carbon(NPC) sulfur host was *** ZnO/ZnS heterostructure regulates the electronic structure of the material and exhibits higher metal-like ***,the ZnO/ZnS heterostructure combines the strong adsorption property of ZnO and the high catalytic ability of ZnS to realize the anchoring-diffusionconversion of lithium poly sulfides(LiPSs).Results reveal that the developed ZnO/ZnS@NPC/S cathode has excellent electrochemical performance in LSBs,achieving a high discharge specific capacity of 1365.3 mAh·g^(-1) at 0.1C and excellent rate capability(719 mAh·g^(-1) at 2C;the capacity decay rate is only 0.042% per cycle after 1000 cycles).Even under a high sulfur loading-E/S(electrolyte/sulfur)ratio of 5.1 mg·cm^(-2)-6 μl·mg^(-1),a high specific capacity of 723.7 mAh·g^(-1) is maintained after 60 *** study provides a new strategy for a multifunctional sulfur host that can effectively alleviate the shuttle effect of LiPSs and improve the utilization of sulfur active substances.

关键词： ZnO/ZnS heterostructure Lithium-sulfur batteries Density functional theory Anchor Conversion

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Heterostructure:application of absorption-catalytic center in lithium-sulfur batteries

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Rare Metals 2024年第4期43卷 1461-1487页

作者： Fei Wang Chun-Man Yang Yong-Qi Wang Dan You Wen-Hao Yang Rong-Wei Huang Ji-Yue Hou Qian Wang Ying-Jie Zhang Ying Wang Yue-Jing Zeng Yi-Yong Zhang Xue Li National Local Joint Engineering research Center for Lithium-Ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Batteries Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming650093China College of Electrical Information Engineering Panzhihua UniversityPanzhihua617000China State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Centre of Chemistry for Energy MaterialsState-Province Joint Engineering Laboratory of Power Source Technology for New Energy VehicleEngineering Research Center of Electrochemical TechnologyMinistry of EducationCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China

Due to the high theoretical specific capacity(1675 mAh·g^(-1)),low cost,and high safety of the sulfur cathodes,they are expected to be one of the most promising rivals for a new generation of energy storage ***,the shuttle effect,low conductivity of sulfur and its discharge products,volume expansion,and other factors hinder the commercialization of lithium-sulfur batteries(LSBs).The development of sulfur-fixing materials and the design of multifunctional materials to enhance the electrochemical performance of LSBs have been the main research priorities in recent *** of the advantages of high conductivity,built-in electric field,and good synergism,more and more researchers have employed heterostructure into sulfur-fixing materials to enhance the catalytic and absorption ability for *** this review,the principle of heterostructure and the mechanism of enhancing the performance of lithium-sulfur batteries are *** applications of heterostructure in cathode and interlayer of LSBs in the latest years are ***,the cutting-edge troubles and possibilities of heterostructures in LSBs are briefly presented.

关键词： Lithium-sulfur batteries(LSBs) Heterostructure Built-in electric field Catalytic Absorption

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Mechanistic insights into stepwise activation of malachite for enhancing surface reactivity and flotation performance

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International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2159-2172页

作者： Qicheng Feng Wanming Lu Han Wang Qian Zhang State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Faculty of Land Resource EngineeringKunming University of Science and TechnologyKunming 650093China yunnan Key Laboratory of Green Separation and Enrichment of Strategic Mineral Resources Kunming University of Science and TechnologyKunming 650093China

Malachite is a common copper oxide mineral that is often enriched using the sulfidization-xanthate flotation ***,the direct sulfidization method cannot yield copper concentrate ***,a new sulfidization flotation process was developed to promote the efficient recovery of *** this study,Cu^(2+) was used as an activator to interact with the sample surface and increase its reaction sites,thereby strengthening the mineral sulfidization process and *** to single copper ion activation,the flota-tion effect of malachite significantly increased after stepwise Cu^(2+) *** potential,X-ray photoelectron spectroscopy(XPS),time-of-flight secondary ion mass spectroscopy(ToF-SIMS),scanning electron microscopy and energy dispersive spectrometry(SEM-EDS),and atomic force microscopy(AFM)analysis results indicated that the adsorption of S species was significantly enhanced on the mineral surface due to the increase in active Cu sites after Cu^(2+) stepwise ***,the proportion of active Cu-S spe-cies also increased,further improving the reaction between the sample surface and subsequent ***-transform infrared spec-troscopy(FT-IR)and contact angle tests implied that the xanthate species were easily and stably adsorbed onto the mineral surface after Cu^(2+) stepwise activation,thereby improving the hydrophobicity of the mineral ***,the copper sites on the malachite sur-face after Cu^(2+) stepwise activation promote the reactivity of the mineral surface and enhance sulfidization flotation of malachite.

关键词： malachite copper ions stepwise activation flotation mechanism enhanced sulfidization

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Instantaneous deformation characteristics of a single bubble in immiscible fluids

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Journal of Iron and Steel research International 2022年第10期29卷 1601-1612页

作者： Jia-rui Xu Xiao-hui Zhang Shan Qing Hao Zhang Hua Wang Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming650093YunnanChina National Local Joint Engineering research Center of Energy Saving and Environmental Protection Technology in Metallurgy and Chemical Engineering Industry Kunming University of Science and TechnologyKunming650093YunnanChina

The passage of a rising bubble through immiscible fluids is encountered in bath *** order to investigate characteristics of bubble deformation in immiscible fluids,the bubble shape change at the interface and the relationship between the bubble aspect ratio(E)and dimensionless number of forces were obtained.A three-dimensional model was established,and the free-floating behavior of a single bubble in immiscible fluids was numerically simulated by phase-field *** simulation results are in good agreement with experimental *** results indicate that when the bubble passes through the interface,the bubble shape is divided into four types in turn:“pear”,inverted“pear”,“convex”and“droplet”*** the lower liquid,the relationship of E to Weber number(We),Tadaki number(Ta),and Reynolds number(Re)is distributed between two intersecting *** relationship of E to Eötvös number(Eo),a dimensionless group,and Galilei number(Ga)is distributed near the lines with slopes of−3.325×10^(-5),−0.0855,and−8.73×10^(-4),*** the upper liquid,the relationship of E to We,Ta,and Re is distributed between two parallel *** with gravity,the inertial force plays a leading role in the bubble shape in the lower and upper *** with the viscous force,the surface tension dominates the bubble shape in the lower liquid.

关键词： Bubble shape Immiscible fluid Dimensionless number Phase-field method

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Resistance characteristics of paste pipeline flow in a pulse-pumping environment

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International Journal of Minerals,Metallurgy and Materials 2023年第8期30卷 1596-1607页

作者： Haiyong Cheng Zemin Liu Shunchuan Wu Hong Li Jiaqi Zhu Wei Sun Guanzhao Jiang Faculty of Land Resources Engineering Kunming University of Science and TechnologyKunming 650093China Key Laboratory of Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines University of Science and Technology BeijingBeijing 100083China

Paste flow patterns and microscopic particle structures were studied in a pressurized environment generated by a pulse *** loop-pipe experiments and fluid-solid coupling-based simulations were *** scanning electron microscopy technique was also *** revealed that flow resistance is closely related to pipeline curvature and angle in a complex pipe *** vertical downward-straight pipe-inclined downward combination was adopted to effectively reduce the loss in resistance along with reducing the number of bends or increasing the radius of bend *** maximum velocity ratio and velocity offset values could quantitatively characterize the influences of different pipeline layouts on the *** correlation reached 96%.Particle distribution and interparticle forces affected flow *** particle states and weak interparticle forces were conducive to steady *** pump pressure led to high flow *** could improve pipe flow stability by increasing flow uniformity and particle motion *** results can contribute to safe and efficient paste filling.

关键词： pulse-pumping flow state fluid–solid coupling paste filling transportation

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Effect of dissolved components of malachite and calcite on surface properties and flotation behavior

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International Journal of Minerals,Metallurgy and Materials 2023年第7期30卷 1297-1309页

作者： Zhihao Shen Shuming Wen Han Wang Yongchao Miao Xiao Wang Shengbing Meng Qicheng Feng State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Faculty of Land Resource EngineeringKunming University of Science and TechnologyKunming 650093China yunnan Key Laboratory of Green Separation and Enrichment of Strategic Mineral Resources Kunming University of Science and TechnologyKunming 650093China

In general,malachite is recovered via sulfidization–xanthate flotation,although many unsatisfactory flotation indexes are frequently obtained as a result of the presence of associated *** phenomenon occurs because the dissolved components of malachite and calcite affect the flotation behavior of both *** this study,the effect of the dissolved components derived from malachite and calcite on the flotation behavior and surface characteristics of both minerals was *** tests indicated that malachite recovery decreased when the calcite supernatant was introduced,while the presence of the malachite supernatant increased the recovery of *** and adsorption tests,along with zeta potential measurements,X-ray photoelectron spectroscopy,Fourier transform infrared spectrometry,and timeof-flight secondary ion mass spectrometry demonstrated that the Ca species in the calcite supernatant were adsorbed on the malachite surface,which hindered the interaction of Na2S with malachite,thereby resulting in the insufficient adsorption of sodium isoamyl xanthate(NaIX)on the surface of *** contrast,the Cu species in the malachite supernatant were adsorbed on the calcite surface,and they provided active sites for the subsequent adsorption of Na_(2)S and NaIX.

关键词： malachite calcite dissolved components sulfidization-xanthate flotation surface properties

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Review of the research on the development and utilization of clay-type lithium resources

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Particuology 2024年第4期87卷 46-53页

作者： Ruiqi Xie Zhihui Zhao Xiong Tong Xian Xie Qiang Song Peiqiang Fan Faculty of Land Resource Engineering Kunming University of Science and TechnologyKunming650093China yunnan Engineering research Center for Metal Tailings Resource Utilization Kunming650093China

Since the demands for lithium have been in explosive growth recently and several great clay lithium resources were founded in China,the development and utilization of clay-type lithium resources become a hot *** order to provide a guidance for the concentration and extracting lithium of clay-type lithium resources,this review systematically summarized the main types and characteristics of clay-type lithium resources and the research status of lithium extraction from clay lithium ***,the flotation research status of the main mineral of clay lithium ore was also ***,we discussed the difficulties in the development and utilization of clay-type lithium ore and put forward the subsequent research *** paper can provide a guidance for the con-centration and extracting lithium of clay-type lithium resources in the future.

关键词： Clay lithium Clay mineral flotation Lithium extraction Leaching

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