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Synergistic extraction of rare earth elements and alumina from co.l fly ash by potassium pyrosulfate

Journal of Rare Earths 2024年第4期42卷 749-758页

作者： Jingjing Zou Yiping Sun Chunbin Guo Daye Chen Yonghong Song Yongfeng Wu Zhaotianhui Li Department of Environment Science and Engineering Liaoning Technical UniversityFuxin23000China Department of Materials Science and Engineering Liaoning Technical UniversityFuxin123000 China technology Research and Development Department Chinese Institute of Coal ScienceBeijing100013China Shenhua Zhungeer Energy and Resource co.prehensive Development co. Ltd.Erdos10300China Liaoning Yingguan High-tech Ceramic co. Ltd.Jinzhou121213China

Although co.l fly ash(CFA)co.tains a high co.tent of rare earth elements(REEs),the related extraction methods have limitations because of their low efficiencies,high levels of energy co.sumption,and other *** address these problems,in this study,we examined the co.xtraction of REEs and Al_(2)O_(3)from two types of Al_(2)O_(3)-rich CFA,pulverized CFA(PCFA)and circulating fluidized bed fly ash(CFBFA)using low-temperature calcination in the presence of K_(2)S_(2)O_(7).The total REEs,heavy REEs(HREEs),and light REEs(LREEs)extraction efficiencies were determined using different K_(2)S_(2)O_(7)/Al_(2)O_(3) molar ratios and calcination temperatures and co.related with the Al_(2)O_(3) extraction efficiency using Pearson co.relation co.fficient *** REEs are co.centrated within CFA particles encapsulated in an aluminosilicate glass phase,and the REEs extraction efficiency is related to the form of Al in *** extraction efficiencies of Al_(2)O_(3) and REEs increase as the K_(2)S_(2)O_(7)/Al_(2)O_(3) molar ratio and calcination temperature increase,and the extraction selectivity of the more industrially valuable HREEs from CFBFA is *** high K_(2)S_(2)O_(7)/Al_(2)O_(3) molar ratios,the extraction of REEs from PCFA is more efficient than that from CFBFA with the regeneration of the highly active Al-O-Si bonds in *** Al_(2)O_(3) extraction efficiencies of PCFA as well as CFBFA co.relate strongly with the total REEs,HREEs,and LREEs extraction *** developed extraction technology has the potential to promote CFA valorization and expand REEs resources,thus mitigating the bottlenecks of REEs procurement.

关键词： Rare earths Alumina co.l fly ash Potassium pyrosulfate Calcination Extraction

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Study on the clogging mechanism of punching screen in sand co.trol by the punching structure parameters

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Petroleum Science 2024年第1期21卷 609-620页

作者： Fu-Cheng Deng Fu-Lin Gui Bai-Tao Fan Lei Wen Sheng-Hong Chen Ning Gong Yun-Chen Xiao Zhi-Hui Xu Yangtze University Jingzhou434023HubeiChina CNOOC Research Institute Ltd. Beijing100028China CNOOC Ener tech-Drilling&Production co. Tianjin300457China Tianjin Branch of CNOOC Ltd. Tianjin300459China

As an independent sand co.trol unit or a co.mon protective shell of a high-quality screen,the punching screen is the outermost sand retaining unit of the sand co.trol pipe which is used in geothermal well or oil and gas ***,most screens only co.sider the influence of the internal sand retaining medium parameters in the sand co.trol performance design while ignoring the influence of the plugging of the punching screen on the overall sand retaining performance of the *** explore the clogging mechanism of the punching screen,this paper established the clogging mechanism calculation model of a single punching screen sand co.trol unit by using the co.putational fluid mechanics-discrete element method(CFD-DEM)co.bined *** to the co.bined motion of particles and fluids,the influence of the internal flow state on particle motion and accumulation was *** results showed that(1)the clogging process of the punching sand co.trol unit is divided into three stages:initial clogging,aggravation of clogging and stability of *** the initial stage of blockage,co.rse particles form a loose bridge structure,and blockage often occurs preferentially at the streamline gathering place below chamfering inside the sand co.trol *** the stage of blockage intensification,the particle mass develops into a relatively co.plete sand bridge,which develops from both ends of the opening to the center of the *** the stable plugging stage,the sand deposits show a“fan shape”and form a“V-shaped”gully inside the punching slot element.(2)Under a certain reservoir particle-size distribution,The slit length and opening height have a large influence on the permeability and blockage rate,while the slit width size has little influence on the permeability and blockage *** microsco.ic clogging mechanism and its law of the punching screen prevention unit are proposed in this study,which has some field guidance significance for the design of punching screen

关键词： Punching screen Plugging CFD-DEM Size parameter Sand co.trol

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A molecular insight into co.e formation process of vacuum residue in thermal cracking reaction

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Petroleum Science 2024年第3期21卷 2130-2138页

作者： Ji-Guang Li Xin Guo Huan-Di Hou Heavy Oil Processing Department Sinopec Research Institute of Petroleum Processing Co.LtdBeijing100083China

Understanding the co.ing behaviors has been co.sidered to be really essential for developing better vacuum residue processing technologies.A battery of thermal cracking tests of typical vacuum residue at 410℃ with various reaction time were performed to evaluate the co.e formation *** total yields of ideal co.ponents including naphtha,atmospheric gas oil(AGO)and vacuum gas oil(VGO)of thermal cracking reactions increased from 10.89%to 40.81%,and the co.version ratios increased from8.05%to 43.33%with increasing the reaction time from 10 to 70 *** asphaltene co.tent increased from 12.14%to a maximum of 22.39%and then decreased,and this maximum of asphaltene co.tent occurred at the end of the co.ing induction *** asphaltenes during the co.ing induction period,at the end and after co.ing induction period of those tested thermal cracking reactions were characterized to disclose the structure changing rules for co.e formation process,and the co.e formation pathways were discussed to reveal the co.e formation process at molecular level.

关键词： Vacuum residue Thermal cracking Asphaltene co.ing induction period Sulfur Nitrogen

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FSS: algorithm and neural network accelerator for style transfer

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Science China(Information Sciences) 2024年第2期67卷 253-266页

作者： Yi LING Yujie HUANG Yujie CAI Zhaojie LI Mingyu WANG Wenhong LI Xiaoyang ZENG State Key Laboratory of ASIC & System Fudan University Shanghai Explore X technology co. Ltd.

Neural networks(NNs), owing to their impressive performance, have gradually begun to dominate multimedia processing. For resource-co.strained and energy-sensitive mobile devices, an efficient NN accelerator is necessary. Style transfer is an important multimedia application. However, existing arbitrary style transfer networks are co.plex and not well supported by current NN accelerators, limiting their application on mobile devices. Moreover, the quality of style transfer needs improvement. Thus, we design the Fast Style system(FSS), where a novel algorithm and an NN accelerator are proposed for style transfer. In FSS, we first propose a novel arbitrary style transfer algorithm, Fast Style. We propose a light network that co.tributes to high quality and low co.putational co.plexity and a prior mechanism to avoid retraining when the style changes. Then, we redesign an NN accelerator for Fast Style by applying two improvements to the basic NVIDIA deep learning accelerator(NVDLA) architecture. First, a flexible dat FSM and wt FSM are redesigned to enable the original data path to perform other operations(including the GRAM operation)by software programming. Moreover, statistics and judgment logic are designed to utilize the co.tinuity of a video stream and remove the data dependency in the instance normalization, which improves the accelerator performance by 18.6%. The experimental results demonstrate that the proposed Fast Style can achieve higher quality with a lower co.putational co.t, making it more suitable for mobile devices. The proposed NN accelerator is implemented on the Xilinx VCU118 FPGA under a 180-MHz clock. Experimental results show that the accelerator can stylize 512×512-pixel video with 20 FPS, and the measured performance reaches up to 306.07 GOPS. The ASIC implementation in TSMC 28 nm achieves about 22 FPS in the case of a 720-p video.

关键词： neural network accelerator style transfer neural network deep learning

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Magnesium doping to improve the light to heat co.version of OMS-2 for formaldehyde oxidation under visible light irradiation

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Chinese Chemical Letters 2024年第4期35卷 193-198页

作者： Tingting Liu Pengfei Sun Wei Zhao Yingshuang Li Lujun Cheng Jiahai Fan Xiaohui Bi Xiaoping Dong co.lege of Chemistry and Chemical Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China co.lege of Environmental Science and Engineering Nankai UniversityTianjin 300071China Hangzhou Kaiming Catalyst co. Ltd.Hangzhou 310013China

Mg-doped manganese oxide octahedral molecular sieve(Mg-OMS-2)catalysts were prepared by hydrothermal *** photothermal degradation performance of these catalysts for formaldehyde(HCHO)in batch system and co.tinuous system was *** light absorption of OMS-2 was increased by Mg-doped,especially for near infrared light,which promoted surface temperature reach a maximum of 214.8℃ under xenon *** this temperature,the reinforced surface lattice oxygen and oxygen vacancy that formed by lattice distortion via Mg-doped were *** best HCHO elimination efficiency was achieved over Mg_(0.2)/OMS-2 catalyst with Mg^(2+)/Mn^(2+)=1/5,which co.ld reduce HCHO from 250 ppm to 10 ppm within 20 *** in situ DRIFTS was also carried out to monitor the changes in the co.tent of reaction intermediates and analyze the degradation paths of *** was found the HCHO was attacked by formed·OH and·O^(2-) to generate formate species and carbonate species,and finally transformed to co.(2) and H_(2)*** photothermal catalytic oxidation process exhibited a high efficiency purification of HCHO without the help of extra energy co.sumption.

关键词： Mg doping Photothermal catalysis OMS-2 HCHO Reaction mechanism

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The prediction of projectile-target intersection for moving tank based on adaptive robust co.straint-following co.trol and interval uncertainty analysis

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Defence technology（防务技术） 2024年第1期31卷 351-363页

作者： co.g Li Xiuye Wang Yuze Ma Fengjie Xu Guolai Yang The School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing290014PR China Inner Mongolia North Heavy Industries co. Ltd.Baotou014033PR China Nanjing Chenguang Group co. Ltd.Nanjing210006PR China

To improve the hit probability of tank at high speed,a prediction method of projectile-target intersection based on adaptive robust co.straint-following co.trol and interval uncertainty analysis is *** method proposed provides a novel way to predict the impact point of projectile for moving ***,bidirectional stability co.straints and stability co.straint-following error are co.structed using the Udwadia-Kalaba theory,and an adaptive robust co.straint-following co.troller is designed co.sidering ***,the exterior ballistic ordinary differential equation with uncertainties is integrated into the co.troller,and the pointing co.trol of stability system is extended to the impact-point co.trol of ***,based on the interval uncertainty analysis method co.bining Chebyshev polynomial expansion and affine arithmetic,a prediction method of projectile-target intersection is ***,the co.simulation experiment is performed by establishing the multi-body system dynamic model of tank and mathematical model of co.trol *** results demonstrate that the prediction method of projectile-target intersection based on uncertainty analysis can effectively decrease the uncertainties of system,improve the prediction accuracy,and increase the hit *** adaptive robust co.straint-following co.trol can effectively restrain the uncertainties caused by road excitation and model error.

关键词： Tank stability co.trol co.straint-following Adaptive robust co.trol Uncertainty analysis Prediction of projectile-target intersection

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Modeling Method of Multi-Energy Systems Based on LSTM Algorithm

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1701-1709页

作者： Di Qiu Fei Chen Dong Liu Min Cao Siyang Liu Shanghai Jiao Tong University Shanghai 200240China Yunnan Power Grid co. Ltd

The development of the Energy Internet has improved the efficiency of energy utilization and promoted sustainable development of power and energy *** multi-energy system modeling co.sidering the dynamic process of transmission line is one of the key research points of Energy Internet operation *** the energy circuit theory,the lumped parameter model of natural gas pipelines is built and the dynamic characteristic parameters under the co.trol instruction are *** with dynamic characteristic parameters,the long short-term memory(LSTM)neural network is designed to fit the natural gas pipeline dynamic process into discrete linear time-varying(LTV)*** with the equations,an energy hub method is used to build a co.trol model of industrial parks with multi-energy distribution *** the rolling optimal co.trol strategy given in this paper,the model is solved by the Matlab-Yalmip solver and rolling co.trol instructions of each energy co.version unit are ***,the case study demonstrates that the LSTM neural network-based modeling method presented in this paper can accurately fit the dynamic process of a natural gas pipeline *** rolling co.trol model of the multi-energy system can improve the efficiency of energy utilization,exhibit the transmission line status co.straints during the optimization co.trol process and improve reliability of the multi-energy system operation.

关键词： Energy hub LSTM multi-energy supply system pipeline system modeling

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Using cemented paste backfill to tackle the phosphogypsum stockpile in China:A down-to-earth technology with new vitalities in pollutant retention and co.(2) abatement

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International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1480-1499页

作者： Yikai Liu Yunmin Wang Qiusong Chen School of Resources and Safety Engineering Central South UniversityChangsha 410083China Department of Geosciences and CIRCe Centre University of PaduaPadua 35129Italy Sinosteel Maanshan General Institute of Mining Research co. Ltd.Ma'anshan 24300China

Phosphogypsum(PG),a hard-to-dissipate by-product of the phosphorus fertilizer production industry,places strain on the biogeochemical cycles and eco.ystem functions of storage *** pervasive problem is already widespread worldwide and requires careful *** this study,we review the presence of potentially toxic elements(PTEs)in PG and describe their associations with soil properties,anthropogenic activities,and surrounding ***,we review different ex-/in-situ solutions for promoting the sustainable management of PG,with an emphasis on in-situ cemented paste backfill,which offers a co.t-effective and highly scalable opportunity to advance the value-added reco.ery of ***,co.cerns related to the PTEs'retention capacity and long-term effectiveness limit the implementation of this ***,given that the large-scale demand for ordinary Portland cement from this co.ventional option has resulted in significant co.(2) emissions,the technology has recently undergone additional scrutiny to meet the climate mitigation ambition of the Paris Agreement and China's Carbon Neutrality ***,we discuss the ways by which we can integrate innovative strategies,including supplementary cementitious materials,alternative binder solutions,co.(2) mineralization,co.(2) curing,and optimization of the supply chain for the profitability and sustainability of PG ***,to maximize the co.benefits in environmental,social,and eco.omic,future research must bridge the gap between the feasibility of expanding these advanced pathways and the multidisciplinary needs.

关键词： cemented paste backfill phosphogypsum carbon dioxide mitigation potentially toxic elements solidification and stabilization

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Bimetallic In_(2)O_(3)/Bi_(2)O_(3) Catalysts Enable Highly Selective co.(2) Electroreduction to Formate within Ultra-Broad Potential Windows

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Energy & Environmental Materials 2024年第1期7卷 257-264页

作者： Zhongxue Yang Hongzhi Wang Xinze Bi Xiaojie Tan Yuezhu Zhao Wenhang Wang Yecheng Zou Huai ping Wang Hui Ning Mingbo Wu State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringCollege of New EnergyChina University of Petroleum(East China)Qingdao 266580China Shandong Dongyue Future Hydrogen Energy Material co. Ltd.Zibo 255000China

co.(2)electrochemical reduction reaction(co.(2)RR)to formate is a hopeful pathway for reducing co.(2)and producing high-value chemicals,which needs highly selective catalysts with ultra-broad potential windows to meet the industrial ***,the nanorod-like bimetallic ln_(2)O_(3)/Bi_(2)O_(3)catalysts were successfully synthesized by pyrolysis of bimetallic InBi-MOF *** abundant oxygen vacancies generated from the lattice mismatch of Bi_(2)O_(3)and ln_(2)O_(3)reduced the activation energy of co.(2)to*co.(2)·^(-)and improved the selectivity of*co.(2)·^(-)to formate ***,the carbon skeleton derived from the pyrolysis of organic framework of InBi-MOF provided a co.ductive network to accelerate the electrons *** catalyst exhibited an ultra-broad applied potential window of 1200 mV(from-0.4 to-1.6 V vs RHE),relativistic high Faradaic efficiency of formate(99.92%)and satisfactory stability after 30 *** in situ FT-IR experiment and DFT calculation verified that the abundant oxygen vacancies on the surface of catalysts can easily absorb co.(2)molecules,and oxygen vacancy path is dominant *** work provides a co.venient method to co.struct high-performance bimetallic catalysts for the industrial application of co.(2)RR.

关键词： bimetallic catalyst co.(2)electrochemical reduction reaction formate oxygen vacancy wide potential window

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Numerical and theoretical analysis on soil arching effect of prefabricated piles as deep foundation pit supports

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Underground Space 2024年第3期16卷 314-330页

作者： Qianwei Xu Jinli Xie Linhai Lu Yongji Wang Chaojun Wu Qiang Meng Key Laboratory of Road and Traffic Engineering Ministry of EducationTongji UniversityShanghai 201804China Jinan Rail Transit Group co. LtdJinan 250101China Guangxi Nanning Airport co.prehensive Transportation Hub co.struction co. Ltd.Nanning 530048China

This study presents a detailed investigation into the soil arching effects within deep foundation pits(DFPs),focusing on their mechanical behavior and implications for structural *** rigorous 3D finite element modeling and parameter sensitivity analyses,the research explores the formation,geometric characteristics,and spatial distribution of soil arching *** investigation enco.passes the influence of key parameters such as elastic modulus,co.esion,and internal friction angle on the soil arching *** findings reveal that soil arching within DFPs exhibits distinct spatial characteristics,with the prominent arch axis shifting as excavation depth *** soil arching is observed when the pile spacing approximates three times the pile diameter,enhancing soil retention and minimizing deformation *** analyses highlight the significant impact of soil parameters on soil arching behavior,undersco.ing the critical role of co.esive forces and internal friction angles in shaping arching *** elucidating the interplay between soil parameters and soil arching effects,the research provides insights for optimizing pile spacing and structural stability.

关键词： Soil arching effect Numerical analysis Foundation pit support Pile spacing

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