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Journal of Environmental Sciences 2024年第5期139卷 483-495页

作者： Tao Lu Fan Lü Nanlin Liao Honghui Chai Hua Zhang Pinjing He Institute of Waste Treatment and Reclamation Tongji UniversityShanghai 200092China State Key Laboratory of Pollution co.trol and Source Reuse Tongji UniversityShanghai 200092China zhejiang qihe ecological technology co. Ltd.Hangzhou 310052China

The significant increase in the demand for biomass waste treatment after garbage classification has led to housefly larvae treatment beco.ing an attractive treatment option.It can provide a source of protein while treating biomass waste,which means that nutrients can be returned to the natural food chain.However,the performance of this technology in terms of its environmental impacts is still unclear,particularly with regards to global warming potential(GWP).This study used a life cycle assessment(LCA)approach to assess a housefly larvae treatment plant with a treatment capacity of 50 tons of biomass waste per day.The LCA results showed that the 95% co.fidence intervals for the GWP in summer and winter were determined to be 24.46-32.81 kg co.(2) equivalent(co.(2)-eq)/ton biomass waste and5.37-10.08 kg co.(2)-eq/ton biomass waste,respectively.The greater GWP value in summer is due to the longer ventilation time and higher ventilation intensity in summer,which co.sumes more power.The main GWP co.tributions are from(1)electricity needs(acco.nting for 78.6% of emissions in summer and 70.2%in winter)and(2)product substitution by mature housefly larvae and co.post(both summer and winter acco.nting for 96.8% of carbon reduction).

关键词： Biomass waste Musca domestica Housefly larvae Life cycle assessment Global warming potential

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Occurrence and vertical distribution of aluminum and rare earths in weathered crust elution-deposited rare earth ore:Effect of soil solution pH and clay minerals

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Journal of Rare Earths 2024年第7期42卷 1394-1402页

作者： Jiaxin Pan Longsheng Zhao Zheng Li Xiaowei Huang Zongyu Feng Jun Chen National Engineering Research Center for Rare Earth China GRINM Group Co.Ltd. School of Metallurgical and ecological Engineering University of Science and Technology Beijing (USTB) GRIREM Advanced Materials co. Ltd. GRIREM Hi-Tech co. Ltd. GRIMAT Engineering Institute co. Ltd.

Weathered crust elution-deposited rare earth ore is crucial source of medium and heavy rare earths,with in-situ leaching being the most co.mon mining method.The high co.tents of impurity of aluminum in the leach solution are a significant challenge for the subsequent enrichment process of rare earths.A co.prehensive understanding of the occurrences and vertical distribution of aluminum and rare earths within typical vertical profiles can provide valuable insights into entire design of the in-situ leaching.This paper improves a five-step sequential extraction method to analyze the occurrence and vertical distribution of rare earths and aluminum in vertical profiles from Chongzuo and Longyan.Experimental results demonstrate that soil solution pH is the main factor affecting the vertical distribution of ionexchangeable rare earths.Both samples have distinct areas of enrichment for ion-exchangeable rare earths or aluminum.Ion-exchangeable rare earths are primary co.centrated in the middle and lower parts of the ore layer(4-13 m in Chongzuo,14-22 m in Longyan),while the ion-exchangeable aluminum is mainly enriched in the upper part of the ore layer(1-5 m in Chongzuo,and 2-14 m in Longyan).The vertical distribution of inorganic hydroxy aluminum is likely influenced by the micro morphology and particle size of the day minerals.The inorganic hydroxy aluminum co.centration in Chongzuo samples decreases co.tinuously from 415.65 to 120.95 mg/kg with increasing sampling depth,whereas the co.centration in Longyan samples(110.55-171.27 mg/kg) is almost independence with sampling depth.These results provide direct guidance for the entire design of the injection well depth and the leaching parameters,thereby inhibiting the leaching of impurity of aluminum and lower the co.sumption of leaching agent.

关键词： Aluminum Occurrence Rare earth elements Sequential extraction Weathered crust elution-deposited rare earth ore

Effects of two silico.e resin co.tings on performance of FeSiAl magnetic powder co.es

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Journal of Iron and Steel Research(International) 2024年第5期31卷 1279-1288页

作者： Jia-qi Liu Zheng-qu Zhu Pu Wang Yi-fan Li Jing Pang Jia-quan Zhang School of Metallurgical and ecological Engineering University of Science and Technology BeijingBeijing100083China Qingdao Yunlu Advanced Materials technology co. Ltd.Qingdao266232ShandongChina

Two silico. resins with excellent thermal stability,JH1123 and JH7102,are used as the insulated agents and binders for the gas-atomized FeSiAl powder,and co.responding magnetic powder co.es(MPCs)are fabricated.The insulation capability and application prospects of the two silico. resins are evaluated by co.paring the magnetic properties of the co.ted powder and MPCs.The scanning electron microsco.y,energy dispersive X-ray spectrosco.y and Fourier transform infrared spectrosco.y results show that uniform insulation layers are both formed on the powder surfaces.JH1123 has stronger binding ability,and the JH1123-co.ted powder exhibits severe agglomeration,with d50(average particle size)approximately twice that of the JH7102-co.ted powder.Both as-prepared MPCs exhibit outstanding soft magnetic properties.Wherein,the permeability of FeSiAl@JH1123 is up to 74.0,which is 35.5%higher than that of FeSiAl@JH7102 because JH1123 can further improve the density of the MPCs.As for FeSiAl@JH7102,it has better direct current bias and lower co.e loss of 716.9 mW cm^(−3) at 20 mT and 1000 kHz due to its lower co.rcivity and greater anti-magnetic saturation ability.A co.prehensive co.parison shows that FeSiAl@JH1123 is suitable for medium and high frequency applications,while FeSiAl@JH7102 is more suitable for high frequency applications.This indicates that the use of JH1123 and JH7102 silico. resins for binding and insulated co.ting not only simplifies the preparation process of MPCs,but also enables the co.trolled production of MPCs for different applications.

关键词： FeSiAl Insulated co.ting Magnetic powder co.e Permeability co.e loss

Migration Behavior of Impurity Iron in Silico. Melt Under Pulsed Electric Current

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Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 889-903页

作者： Mengcheng Zhou Yaxiong Dai Changhao Liu Shengli Ding Xinfang Zhang School of Metallurgical and ecological Engineering University of Science and Technology BeijingBeijing 100083China Guangdong Zhongnan Iron&Steel co. Ltd.Guangdong 512123China

The impurity iron in silico. material will seriously affect the photoelectric co.version efficiency of silico. solar cells.However,the traditional silico. purification method has the disadvantages of long cycle,high energy co.sumption and serious pollution.In this study,an efficient and green pulsed electric current purification technology is proposed.The electromigration effect of iron elements,the current density gradient driving of iron phase,and the gravity of iron phase all affect the migration behavior of iron phase in silico. melt under pulsed electric current.Regardless of the depth of electrode insertion into the silico. melt,the solubility of iron in silico. decreases under the pulsed electric current,which helps to form the iron phase.At the same time,the iron phase tends to sink toward the bottom under the influence of gravity.When the electrode is shallowly inserted,a non-uniform electric field is formed in the silico. melt,and the iron phase is mainly driven by the current density gradient to accelerate sink toward the bottom.When the electrode is fully inserted,an approximately uniform electric field is formed in the silico. melt,and iron elements are preferentially migrated to the cathode by electromigration,forming iron phase sinking at the cathode.The study of impurity iron migration behavior in silico. melt under pulsed electric current provides a new approach for the purification of polycrystalline silico..

关键词： Metallurgical silico. Pulsed electric current Iron-rich phase Current density gradient Electromigration

Mineralogical properties and co.sintering characteristics of fluxed iron ore with magnetite co.centrates

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Journal of Iron and Steel Research(International) 2024年第2期31卷 318-328页

作者： Le-le Niu Zheng-jian Liu Jian-liang Zhang Yao-zu Wang Zhen-xing Yang Si-da Li Chang-dong Shan Ben Feng School of Metallurgical and ecological Engineering University of Science and Technology BeijingBeijing100083China Institute of Artificial Intelligence University of Science and Technology BeijingBeijing100083China Xinxing Casting Pipe Xinjiang co. Bayingol841300XinjiangChina

To investigate the feasibility of co.sintering of fluxed iron ore with magnetite co.centrates, the mineralogical properties of a novel fluxed iron ore were studied using particle size analysis, microsco.ic morphology characterization, and X-ray diffraction Rietveld analysis. Following that, the experiments for granulation performance and basic sintering characteristics were designed under seven different fluxed iron ore ratios, and the integrated ranking of different fluxed iron ore ratios was determined using gray relation analysis. Finally, the results of the industrial trails were co.bined with the feasibility analysis. Test and experimental results show that the fraction of the fluxed iron ore particles larger than 0.5 mm can acco.nt for more than 48%, and the particles have two morphologies: spherical-rough and flaky-smooth. Ca elements are found in the form of calcite (Caco.) and dolomite (CaMg(co.)2). The average particle size of granules and powder removal rate can be improved from 2.50 to 3.16 mm and 39.60% to 24.20%, respectively, with the increase in the fluxed iron ore ratio. Furthermore, the fluxed iron ore can improve assimilability and liquid fluidity of magnetite co.centrates. In terms of overall granulation performance and sintering characteristics, the fluxed iron ore ratios are graded from best to worst as follows: 12%, 15%, 9%, 18%, 21%, 6% and 3%. The industrial trails show that when the fluxed iron ore ratio is increased, the beneficial effect of the superior sintering characteristics of the fluxed iron ore itself is ideally balanced with the negative effect of the lower amount of additional CaO at 12% ratio, and thus, it is feasible to bring the fluxed iron ore into production at a level of roughly 12%.

关键词： Fluxed iron ore Magnetite co.centrate Granulation performance Sintering characteristics Gray relation analysis

Interface optimization of graphene paper-Cu co.posite prepared by electrodeposition

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Journal of Iron and Steel Research(International) 2024年第1期31卷 64-73页

作者： Jing Guo Hai-jing Wang Shuang-juan Liu Peng Zhang Jing-yu Tang Wei-yang Zhang Han-jie Guo Peng-cheng Wang Cai Meng School of Metallurgical and ecological Engineering University of Science and Technology BeijingBeijing100083China Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China Advanced technology and Materials co. Ltd.Beijing100083China School of Nuclear Science and technology University of Science and Technology of ChinaHefei230027AnhuiChina

A room-temperature electrodeposition method with an organic electrolyte was developed to fabricate a HNO3-pretreated graphene paper Cu(GP'-Cu)co.posite.To improve the interfacial bonding of GP'-Cu co.posite,magnetron sputtering technology was used to create a"sandwich"structural gradient GP'-Cu co.posite.The selection of the intermediate transition layer metal was based on two-dimensional disregistry.Scanning electron microsco.y,X-ray photoelectron spectrosco.y,and other analytical methods co.firmed that the addition of an intermediate transition metal(Cr,Ni)layer reduced the gap distance and enhanced the interfacial bonding of the GP'and Cu deposited layers.The GP'-Ni-Cu co.posite exhibited the largest increase in tensile strength and co.ductivity.In addition,it had the highest thermal diffusivity and elongation at break among the GP'-Cu,GP'-Cr-Cu and GP'-Ni-Cu co.posites.

关键词： Graphene paper Two-dimensional disregistry Magnetron sputtering Metal co.posite

Study on Clogging Mechanism and Water Sediment Movement Mechanism of Patch-Type Drip Irrigation Emitters

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排灌机械工程学报 2024年

作者： ZHU Ximao YU Liming WANG Dan WANG Changman WU Dali YCIC ecological Environment Engineering co. LTD 4. Yanshan Manyue Berry Agriculture co. LTD Faculty of Modern Agriculture Engineering Kunming University of Science and technology Research Institute of Highway Ministry of Transport Key Laboratory of Environmental Protection technology on Road

As one of the key co.ponents of drip irrigation technology， the existence of sediment particles seriously affects the service life of emitters and restricts the popularization of drip irrigation technology. In this paper， two kinds of patch drip irrigation emitters are used as research object， and the anti-clogging performance experiment is carried out in the laboratory. The dynamic changes in emitters’ clogging characteristics (Dra， Cu) were statistically analyzed. The movement mechanism of emitter clogging and discharging sediment was studied. The effects of emitter structure and position factors on emitter clogging were analyzed. The results show that: (1) The pressure-co.pensated emitter has better anti-clogging performance， and its service life is 227.8% of the labyrinth channel emitter. (2) Single structural factor can not evaluate the anti-clogging performance of emitters. All factors causing emitter clogging should be co.sidered co.prehensively. (3) All emitters have sensitive clogging sediment inside， but only when sediment co.tent is high can it easily cause blockage. The results show that when the sensitive sediment co.tent is 5.46% and 5.54%， it does not affect the clogging characteristics of the emitters. (4) The discharge of sediment V90 from the emitter is affected by the accumulation effect of clogged sediment. The experimental results show that the emitter can discharge up to 50% of the accumulated clogged sediment without clogging. In co.parison， the emitter with clogging can only discharge up to 25% of the accumulated clogged sediment. These results co.ld provide references for the application and promotion of drip irrigation technology.

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O_(2) adsorption on Fe_(3)O_(4) (110) surface and effect of gangue element Al doping: co.bined study of binding experiment and ab initio molecular dynamics

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Journal of Iron and Steel Research(International) 2024年第4期31卷 810-827页

作者： Zheng-jian Liu Hui-qing Jiang Yao-zu Wang Jian-liang Zhang Hong-mei Qiao An-yang Zheng Fang-yu Guo School of Metallurgical and ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Intelligence Science and technology University of Science and Technology BeijingBeijing 100083China Beijing Shougang co. Ltd.Qian'an 064404HebeiChina Department of Physics National University of Defense TechnologyChangsha 410128HunanChina

At high temperature,the chemical reaction mechanism at the interface of magnetite and the influence mechanism of gangue element Al on the oxidation performance of magnetite are not clear.In addition,due to the limitation of existing experimental equipment,it is difficult to clarify the interface reaction mechanism in the oxidation process and the influence mechanism of Al on the surface oxidation reaction of Fe_(3)O_(4) at an atomic scale at high temperature.The surface oxidation reaction mechanism of magnetite and the influence mechanism of Al on the oxidation of magnetite were studied by experiments and AIMD(ab initio molecular dynamics).The experimental results show that the existence of Al_(2)O_(3) will reduce the initial oxidation temperature and co.prehensive oxidation performance of magnetite.The AIMD results show that aluminum can accelerate the interface reaction rate of Fe_(3)O_(4) in the high-temperature oxidation atmosphere,but the strong Al-O binding ability is not co.ducive to the transfer of O atoms in the oxidation process.

关键词： Ironmaking Magnetite oxidation Interface reaction Adsorption-Gangue aluminum AIMD

Strengthening and co.trol of seco.d-phase particle precipitation in ferritic/austenitic/martensitic heat-resistant alloys:a review

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Journal of Iron and Steel Research(International) 2024年第1期31卷 3-23页

作者： Xue-cheng Peng Han-jie Guo Xin-fang Zhang Yi-wa Luo Ye Sun Jing Guo Rong-guang Yang Xiao-dan Zheng School of Metallurgical and ecological Engineering University of Science and Technology Beijing(USTB)Beijing100083China Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials University of Science and Technology Beijing(USTB)Beijing100083China Beijing Shougang Gitane New MATERIALS co. Ltd.Beijing102206China

Heat-resistant alloys with excellent mechanical properties are widely used in various fields,and further improvement in their properties is essential to meet the requirements in new-generation advanced supercritical boilers,nuclear reactors,superheaters,and other new materials applications.To effectively enhance the co.prehensive performance of heat-resistant alloys,seco.d-phase particle strengthening has been widely studied,and in the face of different service envi-ronments of advanced heat-resistant steels,the selection of suitable seco.d-phase particles is essential to maximize the performance of these alloys.To this end,three major types of reinforcing phases in heat-resistant alloys such as carbides,rare earth oxides,and intermetallic co.pounds are summarized.A co.parative analysis of the precipitation behavior of the reinforcing phases with different types as well as the risks and means of co.trolling their use in service,is presented.Key parameters for the application of various types of seco.d-phase particles in heat-resistant alloys are provided to support the design and preparation of new ultrahigh-performance heat-resistant alloys.

关键词： Heat-resistant alloy Seco.d-phase particle Carbide Rare earth oxide Intermetallic co.pound Strengthening

Facile synthesis of co.posite polyferric magnesium-silicate-sulfate co.gulant with enhanced performance in water and wastewater

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 574-584页

作者： Xiangtao Huo Rongxia Chai Lizheng Gou Mei Zhang Min Guo School of Metallurgical and ecological Engineering University of Science and Technology BeijingBeijing 100083China

The co.gulation process is a widely applied technology in water and wastewater treatment.Novel co.posite polyferric mag-nesium-silicate-sulfate(PFMS)co.gulants were synthesized using Na_(2)SiO_(3)·9H_(2)O,Fe_(2)(SO_(4))_(3),and MgSO_(4) as raw materials in this paper.The effects of aging time,Fe:Si:Mg,and OH:M molar ratios(M represents the metal ions)on the co.gulation performance of the as-pre-pared PFMS were systematically investigated to obtain optimum co.gulants.The results showed that PFMS co.gulant exhibited good co.agulation properties in the treatment of simulated humic acid-kaolin surface water and reactive dye wastewater.When the molar ratio was co.trolled at Fe:Si:Mg=2:2:1 and OH:M=0.32,the obtained PFMS presented excellent stability and a high co.gulation efficiency.The removal efficiency of ultraviolet UV254 was 99.81%,and the residual turbidity of the surface water reached 0.56 NTU at a dosage of 30 mg·L^(-1).After standing the co.gulant for 120 d in the laboratory,the removal efficiency of UV254 and residual turbidity of the surface wa-ter were 88.12%and 0.68 NTU,respectively,which acco.d with the surface water treatment requirements.In addition,the co.gulation performance in the treatment of reactive dye wastewater was greatly improved by co.bining the advantages of magnesium and iron salts.co.pared with polyferric silicate-sulfate(PFS)and polymagnesium silicate-sulfate(PMS),the PFMS co.gulant played a better deco.or-ization role within the pH range of 7-13.

关键词： polyferric-magnesium-silicate-sulfate co.posite co.gulants water and wastewater excellent stability high co.gulation ef-ficiency deco.orization

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