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Improving mathematical model of burden distribution and correcting chute angle to cope with fluctuation of stock line

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Journal of Iron and Steel Research International 2024年第2期31卷 342-356页

作者： Jian-sheng Chen Wen-guo Liu Hao Guo Wang Ding Qing-guo Xue Jing-song Wang hai-bin zuo State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China MCC Capital Engineering&Research Incorporation Limited Beijing100176China Hunan Valin Xiangtan Iron and Steel Co. Ltd.Xiangtan411101HunanChina

Accurate evaluations of the burden distribution are of critical importance to stabilize the operation of blast *** mathematical model and discrete element method(DEM)are two attractive methods for predicting burden *** on DEM,the initial velocities of the pellet,sinter,and coke were calculated,and the velocity attenuations of the above three particles between the burden and the chute were *** initial velocity and velocity attenuation were applied to a mathematical model for improving the ***,based on the improved model,a scheme for rectifying the chute angles was proposed to address the fluctuation of the stock line and maintain a stable burden *** validity of the scheme was confirmed via a stable burden distribution under different stock *** mathematical model has been successfully applied to evaluate the online burden distribution and cope with the fluctuation of the stock line.

关键词： Burden distribution Mathematical model Discrete element method Velocity attenuation Stock line fluctuation

Irreducible anteromedial radial head dislocation without fracture caused by transposed biceps tendon in an adult:A case report and literature review

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Chinese Journal of Traumatology 2024年第3期27卷 180-186页

作者： Ming-Fu Fu hai-Ning zuo Tao Sun Ming-Zhang Mu Zhi-Yong Zhou Department of Orthopedic Surgery Yantaishan HospitalYantaiShandong Province264003China

Irreducible anteromedial radial head dislocation(IARHD)caused by transposed biceps tendon is *** diagnosis and surgical failure often occur.A 46-year-old fisherman presented with 10 days history of painful swelling and restricted movement of his right elbow due to strangulation injury by a fishing boat *** examination,the images of the right elbow reveals in a"semi-extended and pronated"elastic fixation *** and 3-dimensional reconstruction CT reveals an isolated anteromedial radial head dislocation with extreme protonation of the radius and the bicipital tuberosity towards the posterior aspect of the elbow joint,and MRI shows biceps tendon wrapping around the radial neck,similar to umbilical cord wrapping seen in *** Henry approach was applied for the first time to reduce the biceps *** patient achieved a good functional recovery at 26 months,which represents the first reported case of IARHD without fracture caused by biceps tendon in an *** treatment of IARHD,attention should be paid to the phenomenon of biceps tendon *** clinical examination,comprehensive imaging modalities,and appropriate surgical approach are the keys to successful management.

关键词： Biceps tendon Henry approach Irreducible Anteromedial dislocation Radial head Elbow Adult

What Controls the Distribution of Ore Veins in Quartz Vein-type Tungsten Deposits: Constrains from Fan-shaped Mineralization in SE China

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Journal of Earth Science 2024年

作者： Gui-Cong Fang Deng-Hong Wang Fu-Qiang Yang Zhan-Xu Ni Chang-Shuai Huang Ping Wang Meng Feng zuo-hai Feng Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration， College of Earth Science， Guilin University of Technology Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources By the Province and Ministry，Guilin University of Technology Institute of Mineral Resources， Chinese Academy of Geological Sciences Guangxi Zhuang Autonomous Region Institute of Geophysical Exploration Geological Team No.271 of Guangxi Zhuang Autonomous Region China Nonferrous Metal Guilin Research Institute of Geology for Mineral Resources Co.， Ltd Guangdong Geologic Survey Institute

Quartz vein-type tungsten deposits are a common W deposit type. Their ore vein distribution was previously considered to be controlled by regional horizontal tectonic stress. In this paper， 14 tungsten deposits with fan-shaped mineralization in SE China are summarized， and the relations between their ore veins and granite and the ore-forming structural stress field are analyzed. These deposits have a post-magmatic hydrothermal genesis and involve the formation of two sets of veins with similar strike and opposite dips at the top of the ore-causative granite bodies， forming a vertical fan-shaped profile. Their ore veins were coeval with the underlying granite bodies， and generally extend along the long axis of the granite. In such fan-shaped ore formation， the stress is highly focused at the top of the granite and gradually weakens outward. The maximum principal stress (σ1) is perpendicular to the granite contact surface， and radiates outward from the pluton. Meanwhile， the minimum principal stress (σ3) forms an arc-shaped band parallel to the contact surface. Our findings， together with published numerical modeling indicate that the emplacement dynamics of granitic magma (rather than regional horizontal tectonic stress) are essential controls on the distribution of ore veins in quartz vein-type tungsten deposits.

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道路塌陷应急处治方法研究

工程建设与设计 2024年第14期 197-199页

作者：张作海郑州航空港汇港发展有限公司郑州450000

随着道路及地下管网使用年限的增长,导致地下管道出现漏水破坏点。漏水点的增大和增多,会掏蚀周边土体形成道路深层空洞,在路面大荷载下易导致路面塌陷。为有效控制道路的使用安全与环境保护,论文结合工程实例,对道路塌陷的成因、道路... 详细信息

随着道路及地下管网使用年限的增长,导致地下管道出现漏水破坏点。漏水点的增大和增多,会掏蚀周边土体形成道路深层空洞,在路面大荷载下易导致路面塌陷。为有效控制道路的使用安全与环境保护,论文结合工程实例,对道路塌陷的成因、道路塌陷处治方案实施进行了全面的分析与研究。

关键词：道路塌陷应急处治方法研究

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Anisotropic s-Wave Gap in the Vicinity of a Quantum Critical Point in Superconducting BaFe_(2)(As_(1-x)P_(x))_(2) Single Crystals:A Study of Point-Contact Spectroscopy

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Chinese Physics Letters 2024年第4期41卷 118-123页

作者：詹红星林玉尺赵宇清左海艳王兴玉马肖燕李春红罗会仟陈根富李世亮任聪 School of Physics and Astronomy Yunnan UniversityKunming 650500China Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China Yunnan Key Laboratory for Electromagnetic Materials and Devices Yunnan UniversityKunming 650500China

We report on soft c-axis point-contact Andreev reflection(PCAR)spectroscopy combining with resistivity measurements on BaFe_(2)(As_(0.7)P_(0.3))_(2),to elucidate the superconducting gap structure in the vicinity of the quantum critical point.A double peak at the gap edge plus a dip feature at zero-bias has been observed on the PCAR spectra,indicative of the presence of a nodeless gap in BaFe_(2)(As_(0.7)P_(0.3))_(2).Detailed analysis within a sophisticated theoretical model reveals an anisotropic gap with deep gap *** PCARs also feature additional structures related to the electron-bosonic coupling *** the extracted superconducting energy gap value,a characteristic bosonic energy Ω_(b) and its temperature dependence are obtained,comparable with the spin-resonance energy observed in neutron scattering *** results indicate a magnetism-driven quantum critical point in the BaFe_(2)(As_(1-x)P_(x))_(2) system.

关键词： quantum critical resistivity

Gasification reactivity and kinetic parameters of coal chars for non-isothermal steam gasification

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Journal of Iron and Steel Research International 2021年第1期28卷 1-9页

作者： Ya-jie Wang hai-bin zuo Jun Zhao Guang-wei Wang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The gasification reactivity and kinetic parameters of coal chars for non-isothermal steam gasification were *** kind of lignite and three kinds of bituminous coals were used as the samples,and their coal ranks follow the ascending order:XBKL>ZJ>*** systematically analyzing factors affecting gasification reactivity,it was ascertained that the gasification reactivity is mostly determined by the carbonaceous *** gasification reactivity is inversely proportional to the coal rank,and the higher the coal rank,the lower the gasification reactivity.A new kinetic model was proposed to calculate the kinetic parameters,in which the reaction order was considered as an unknown kinetic *** reaction order n follows the ascending order:XB

关键词： Non-isothermal gasification Coal char Gasification reactivity Kinetic parameter Reaction order

The mechanism and products for co-thermal extraction of biomass and low-rank coal with NMP

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International Journal of Minerals,Metallurgy and Materials 2019年第12期26卷 1512-1522页

作者： Jun Zhao hai-bin zuo Jing-song Wang Qing-guo Xue State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

The high-value utilization of low-rank coal would allow for expanding energy sources,improving energy efficiencies,and alleviating environmental *** order to use low-rank coal effectively,the hypercoals(HPCs)were co-extracted from two types of low-rank coal and biomass via N-methyl-2-purrolidinone(NMP)under mild *** structures of the HPCs and residues were characterized by proximate and ultimate analysis,Raman spectra,and Fourier transform infrared(FT-IR)*** carbon structure changes within the raw coals and HPCs were *** individual thermal dissolution of Xibu(XB)coal,Guandi(GD)coal,and the biomass demonstrated that the biomass provided the lowest thermal dissolution yield Y1 and the highest thermal soluble yield Y2 at 280℃,and the ash content of three HPCs decreased as the extraction temperature ***-thermal extractions in NMP at various coal/biomass mass ratios were performed,demonstrating a positive synergic effect for Y2 in the whole coal/biomass mass *** maximum value of Y2 was 52.25wt% for XB coal obtained with a XB coal/biomass of 50wt% *** maximum value of Y2 was 50.77wt% for GD coal obtained with a GD coal/biomass of 1:*** difference for the optimal coal/biomass mass ratios between XB and GD coals could be attributed to the different co-extraction mechanisms for this two type coals.

关键词： low-rank coal biomass co-thermal extraction NMP hypercoal

Using HyperCoal to prepare metallurgical coal briquettes via hot-pressing

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International Journal of Minerals,Metallurgy and Materials 2019年第5期26卷 547-554页

作者： Ya-jie Wang hai-bin zuo Jun Zhao Wan-long Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

HyperCoal was prepared from low-rank coal via high-temperature solvent extraction with N-methylpyrrolidone as an extraction solvent and a liquid-to-solid ratio of 50 mL/g in a high-temperature and high-pressure reactor. When HyperCoal was used as a binder and pulverized coal was used as the raw material, the compressive strength of the hot-pressed briquettes(each with a diameter of 20 mm and mass of 5 g) under different conditions was studied using a hot-pressing mold and a high-temperature furnace. The compressive strength of the hot-pressed briquettes was substantially improved and reached 436 N when the holding time period was 15 min, the hot-pressing temperature was 673 K, and the HyperCoal content, was 15 wt%. Changes in the carbonaceous structure, as reflected by the intensity ratio between the Raman G-and D-bands(IG/ID), strongly affected the compressive strength of hot-pressed briquettes prepared at different hot-pressing temperatures. Compared with cold-pressed briquettes, hot-pressed briquettes have many advantages, including high compressive strength, low ash content, high moisture resistance, and good thermal stability; thus, we expect that hot-pressed briquettes will have broad application prospects.

关键词： HyperCoal coal briquette compressive strength binder hot-pressing

Preparation of calcium ferrite by flue gas desulfurization gypsum

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Journal of Iron and Steel Research International 2021年第11期28卷 1357-1365页

作者： Lin-cheng Liu hai-bin zuo Wen-guo Liu Zhi-qiang Xu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

At present,the continuous accumulation of the flue gas desulfurization(FGD)gypsum in steel plants leads to the serious environmental issues and resource *** achieve green and sustainable development for the steel industry,it is significant to improve the usage of by-product *** the sintering FGD gypsum,ferric oxide,and graphite carbon as raw materials,the effects of the carbon content,reaction time,and molar ratio of CaO to Fe_(2)O_(3)on the desulfurization rate of gypsum were studied based on the orthogonal *** results show that the order of the three influencing factors on the desulfurization rate of FGD gypsum is:molar ratio of CaO to Fe_(2)O_(3)>reaction time>carbon *** the optimal conditions of 20 wt.%carbon content,4 h reaction time,and 1:1 molar ratio of CaO to Fe_(2)O_(3),the desulfurization rate of desulfurization gypsum is 95.79%,and 97.57 wt.%of calcium ferrite appears in the solid product,which can be used as sintering additive to increase the economic benefits of enterprises and realize the green ecological development mode of internal generation and internal digestion of solid waste in iron and steel enterprises.

关键词： Flue gas desulfurization gypsum Desulfurization rate Calcium ferrite Sintered ore Green production