检索结果-南通市图书馆

Slag design and optimization for iron capturing platinum group metals from alumina-based spent catalysts

Rare Metals 2023年第6期42卷 2093-2103页

作者： Xue-Feng He Xi-Ping Yin Yun-Ji Ding zhi-sheng shi Bao-Huai Zhao Huan-Dong Zheng Jin-Xin Jian Shen-Gen Zhang Chein-Chi Chang Research Center for Metal Materials Recycling Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083China Shunde Innovation Institute of University of Science and Technology Beijing Foshan528399China Institute of Engineering Technology Sinopec Catalyst Co.Ltd.Beijing101111China Department of Engineering and Technical Services District of Columbia Water and Sewer AuthorityWashington DC20032USA

Production of petrochemical catalysts accounts for one of the largest shares of platinum group metals(PGMs) consumption;thus,recycling of spent petrochemical catalysts holds great economic ***,PGMs are recovered through hydrometallurgical processes which have a low recovery efficiency and produce a large amount of *** this regard,this paper proposed a method to use iron-capturing PGMs based on CaO-Al_(2)O_(3)-Na_(2)O *** method avoided the formation of Fe-Si alloy and achieved efficient enrichment of *** droplet force model showed that the recovery efficiency of PGMs could be improved if the slag had low density and low *** on this result,FactSage software optimized the composition of ***,the effect of B_(2)O_(3) on the 1400 ℃ liquidus of CaO-Al_(2)O_(3)-Na_(2)O_(3)-B_(2)O_(3) phase diagram was ***,it was found that the recovery efficiency of PGMs exceeded 99% under the following optimized conditions:basicity of 1.0,20 wt%Na_(2)O,15 wt% B_(2)O_(3),15 wt% Fe,3 wt% C and a temperature range of 1400-1500℃.The thermodynamic model revealed the mechanism of iron *** chemical bonds prevented the formation of bonds between the alloy and slag,resulting in the separation of the slag from the *** particles and iron microspheres had significant surface Gibbs free *** when iron microspheres and PGMs particles collided and fused with each other to reduce their surface area could the Gibbs free energy of the system be reduced.

关键词： Slag type design Spent catalyst Alumina Platinum group metals(PGMs) Iron capture

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Enrichment of Ni-Mo-V via pyrometallurgical reduction from spent hydrogenation catalysts and the multi-reaction mechanism

引用

Rare Metals 2023年第8期42卷 2700-2712页

作者： zhi-sheng shi Yun-Ji Ding Xi-Ping Yin Bo Liu Han-Lin Shen Bo-Yu Wu Bao-Huai Zhao Feng-Lan Han Christian Ekberg Shen-Gen Zhang Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Shunde Innovation School University of Science and Technology BeijingFoshan 528399China Institute of Engineering Technology SINOPEC Catalyst Co.Ltd.Beijing 101111China School of Material Science and Engineering North Minzu UniversityYinchuan 750021China Nuclear Chemistry and Industrial Material Recycling Department of Chemistry and Chemical EngineeringChalmers University of TechnologyGothenburg 41296Sweden

Spent hydrogenation catalysts are important secondary resources due to richness in the valuable metals of Ni,Mo and *** of valuable metals from spent catalysts has high economic value and environmental benefits since they are hazardous wastes as *** recycling processes including hydrometallurgical leaching and soda roasting-leaching have disadvantages such as generating large amounts of wastewater,long process,and low recovery efficiency of valuable ***,this paper proposed synergistic enrichment of Ni,Mo and V via pyrometallurgical reduction at 1400-1500℃.The melting temperature and viscosity of slag were reduced through slag designing by software FactSage *** phase diagram of Al_(2)O_(3)-Cap-SiO_(2)-Na_(2)O-B_(2)O_(3)was drawn,and low-temperature region(≤1300℃)was selected as target slag ***,Mo,and V can be collaborative captured and recovered through the mutual solubility at molten *** the melting temperature and the amount of CaO,Na_(2)O and C were conducive to improving the metals recovery *** kilogram-scale experiments were carried out,and the recovery efficiencies of Ni,Mo and V were 98.3%,95.3%and 97.9%under optimized conditions:at 1500℃,with the basicity of 1.0,13.1 wt%SiO_(2),7.0 wt%B_(2)O_(3),7.7 wt%Na_(2)O and 20.0wt%*** distribution behavior of valuable metals was clarified by investigating the melting process of slag and the reduction in valuable *** was preferentially reduced and acted as a capturing agent,which captured other metals to form NiMoV alloys.

关键词： Spent hydrogenation catalysts(SHC) Pyrometallurgical reduction Slag design Enrichment Settlement

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Stereotactic conformal radiotherapy of hepatic metastases:clinical analysis of 8 cases

引用

World Journal of Gastroenterology 1999年第4期5卷 81-83页

作者： ZHAO Wei sheng, zhi Da shi, LIU Bo Ping, JIANG Wei, CONG Zheng and DONG Cheng

ＩＮＴＲＯＤＵＣＴＩＯＮＩｔｉｓａｌｗａｙｓａｒｏｕｔｉｎｅｔｏｒｅｓｅｃｔｌｅｓｉｏｎｓｏｆｔｈｅｂｏｄｙｂｙｓｕｒｇｅｒｙ．Ｓｃｉｅｎｔｉｓｔｓｈａｖｅｔｒｉｅｄｔｏｏｂｔａｉｎｔｈｅｓａｍｅｒｅｓｕｌｔｓｗｉｔ... 详细信息

ＩＮＴＲＯＤＵＣＴＩＯＮＩｔｉｓａｌｗａｙｓａｒｏｕｔｉｎｅｔｏｒｅｓｅｃｔｌｅｓｉｏｎｓｏｆｔｈｅｂｏｄｙｂｙｓｕｒｇｅｒｙ．Ｓｃｉｅｎｔｉｓｔｓｈａｖｅｔｒｉｅｄｔｏｏｂｔａｉｎｔｈｅｓａｍｅｒｅｓｕｌｔｓｗｉｔｈｏｕｔｓｕｒｇｅｒｙ，ｂｕｔｆａ...

关键词： liver neoplasms/radiotherapy liver neoplasms/secondary stereotactic conformal radiotherapy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Overview of in-situ oxygen production technologies for lunar resources

引用

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 233-255页

作者： Youpeng Xu sheng Pang Liangwei Cong Guoyu Qian Dong Wang Laishi Li Yusheng Wu zhi Wang College of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China CAS Key Laboratory of Green Process and Engineering National Engineering Research Center for Green Recycling of Strategic Metal ResourcesInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

The rich resources and unique environment of the Moon make it an ideal location for human expansion and the utilization of extraterrestrial ***,crucial for supporting human life on the Moon,can be extracted from lunar regolith,which is highly rich in oxygen and contains polymetallic *** oxygen and metal extraction can be achieved using existing metallurgical ***,the ample reserves of water ice on the Moon offer another means for oxygen *** paper offers a detailed overview of the leading technologies for achieving oxygen production on the Moon,drawing from an analysis of lunar resources and environmental *** delves into the principles,processes,advantages,and drawbacks of water-ice electrolysis,two-step oxygen production from lunar regolith,and one-step oxygen production from lunar *** two-step methods involve hydrogen reduction,carbothermal reduction,and hydrometallurgy,while the one-step methods encompass fluorination/chlorination,high-temperature decomposition,molten salt electrolysis,and molten regolith electrolysis(MOE).Following a thorough comparison of raw materials,equipment,technology,and economic viability,MOE is identified as the most promising approach for future in-situ oxygen production on the *** the corrosion characteristics of molten lunar regolith at high temperatures,along with the Moon's low-gravity environment,the development of inexpensive and stable inert anodes and electrolysis devices that can easily collect oxygen is critical for promoting MOE technology on the *** review significantly contributes to our understanding of in-situ oxygen production technologies on the Moon and supports upcoming lunar exploration initiatives.

关键词： lunar resources in-situ oxygen production space metallurgy molten lunar regolith electrolysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于稀疏矩阵技术的多体动力学仿真快速算法

引用

系统仿真学报 2009年第14期21卷 4238-4242,4247页

作者：高海涛张志胜曹杰史金飞东南大学机械工程学院南京211189

在分析多体动力学仿真计算中广泛使用的增广法基础上,提出了一种基于稀疏矩阵技术的改进算法。算法首先修改了拉格朗日乘子的求解方程,并利用系数矩阵的稀疏性进行排序和符号分解,获得最佳计算数据结构,从而快速求解拉格朗日乘子;针对... 详细信息

在分析多体动力学仿真计算中广泛使用的增广法基础上,提出了一种基于稀疏矩阵技术的改进算法。算法首先修改了拉格朗日乘子的求解方程,并利用系数矩阵的稀疏性进行排序和符号分解,获得最佳计算数据结构,从而快速求解拉格朗日乘子;针对违约现象,建立直接违约修正方程,利用上述数据结构快速求解违约修正值。最后,通过一个算例验证了该算法的有效性,并与传统增广法进行比较,显示了该算法快速和高精度的特点。

关键词：增广法稀疏矩阵动力学仿真算法

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

裸子植物水分特征与抗旱机理研究进展

引用

陕西林业科技 2016年第3期40卷 83-87页

作者：段胜芝马士祝牟凤娟腾冲县林业局和顺林业工作站云南腾冲679116 大理州林业科学研究所云南下关671000 西南林业大学林学院昆明650224

本文从叶片含水量、水势、蒸腾作用及土壤含水量等方面综合阐述了裸子植物在干旱胁迫下的水分代谢活动,鉴于植物的各种代谢活动相互影响,需综合多因素共同探讨植物的抗旱机制,以期为裸子植物的抗旱资源选育提供一定理论依据。

关键词：裸子植物水分特征抗旱机理研究进展

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

真武汤合桃红四物汤对阳虚血瘀型慢性收缩性心力衰竭心肌重构的影响

引用

河南中医 2017年第10期37卷 1746-1748页

作者：肖晓高志生施志琴王静黄美琴上海交通大学医学院附属新华医院崇明分院上海202150

目的:观察真武汤合桃红四物汤对阳虚血瘀型慢性心力衰竭(chronic congestive heart failure,CHF)患者心肌重构的影响。方法:将80例CHF患者随机分为治疗组和对照组,每组各40例。对照组给予西药常规抗心力衰竭药物治疗,治疗组在对照组的... 详细信息

目的:观察真武汤合桃红四物汤对阳虚血瘀型慢性心力衰竭(chronic congestive heart failure,CHF)患者心肌重构的影响。方法:将80例CHF患者随机分为治疗组和对照组,每组各40例。对照组给予西药常规抗心力衰竭药物治疗,治疗组在对照组的基础上服用真武汤合桃红四物汤。观察两组患者的临床疗效,彩超下测量两组患者治疗前后左室舒张末期内径(left ventricular end diastolic diameter,LVEDD)、左室收缩末期内径(Left ventricular end systolic diameter,LVESD)及左室射血分数(left ventricular ejection fraction,LVEF)。检测两组患者治疗前后肌酸激酶同工酶(creatine kinase isoenzyme,CK-MB)、脑钠肽(brain natriuretic peptide,BNP)、基质金属蛋白酶-9(matrix metalloproteinase-9,MMP-9)和金属蛋白酶组织抑制剂-1(tissue inhibitor of metalloproteinase-1,TIMP-1)值。结果:治疗后,两组患者LVEDD、LVESD低于治疗前,LVEF高于治疗前,差异具有统计学意义(P0.05)。治疗后,两组患者BNP值、MMP-9低于治疗前,且治疗组低于对照组;TIMP-1高于治疗前,且治疗组高于对照组,差异均有统计学意义(P<0.05)。治疗组有效率为92.31%,对照组有效率为79.48%,两组患者临床疗效比较,差异具有统计学意义(P<0.05)。结论:真武汤合桃红四物汤治疗阳虚血瘀型慢性收缩性心力衰竭患者,可改善患者临床症状及体征,对提高LVEF、TIMP-1值,降低LVEDD、LVESD、BNP值、MMP-9值具有一定的疗效。

关键词：慢性心力衰竭阳虚血瘀证心肌重构真武汤桃红四物汤左室舒张末期内径肌酸激酶同工酶脑钠肽基质金属蛋白酶-9 金属蛋白酶组织抑制剂-1 左室收缩末期内径左室射血分数

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Using interacting multiple model particle filter to track airborne targets hidden in blind Doppler

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第8期8卷 1277-1282页

作者： DU shi-chuan shi zhi-guo ZANG Wei CHEN Kang-sheng Department of Information and Electronie Engineering Zhejiang University Hangzhou 310027 China

In airborne tracking,the blind Doppler makes the target undetectable,resulting in tracking difficulties. In this paper,we studied most possible blind-Doppler cases and summed them up into two types:targets' intentional tangential flying to radar and unintentional flying with large tangential speed. We proposed an interacting multiple model(IMM) particle filter which combines a constant velocity model and an acceleration model to handle maneuvering motions. We compared the IMM particle filter with a previous particle filter solution. Simulation results showed that the IMM particle filter outperforms the method in previous works in terms of tracking accuracy and continuity.

关键词： Interacting multiple model Particle filter Blind Doppler

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of high-temperature oxidation of SiC powders on curing properties of SiC slurry for digital light processing

引用

Journal of Advanced Ceramics 2023年第1期12卷 169-181页

作者： Zhang-Ao shi Jia-Min WU zhi-Qiang FANG Yu-sheng shi State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Engineering Research Center of Ceramic Materials for Additive Manufacturing Ministry of EducationWuhan 430074China

Fabrication of silicon carbide(SiC)ceramics by digital light processing(DLP)technology is difficult owing to high refractive index and high ultraviolet(UV)absorptivity of SiC *** surface of the SiC powders can be coated with silicon oxide(SiO_(2))with low refractive index and low UV absorptivity via high-temperature oxidation,reducing the loss of UV energy in the DLP process and realizing the DLP preparation of the SiC ***,it is necessary to explore a high-temperature modification process to obtain a better modification effect of the SiC ***,the high-temperature modification behavior of the SiC powders is thoroughly investigated in this *** results show that nano-scale oxide film is formed on the surface of the SiC powders by short-time high-temperature oxidation,effectively reducing the UV absorptivity and the surface refractive index(nʹ)of the SiC *** the oxidation temperature is 1300℃,compared with that of unoxidized SiC powders,the UV absorptivity of oxidized SiC powders decreases from 0.5065 to 0.4654,and a curing depth of SiC slurry increases from 22±4 to 59±4μ***,SiC green bodies are successfully prepared by the DLP with the the oxidized powders,and flexural strength of SiC sintered parts reaches 47.9±2.3 MPa after 3 h of atmospheric sintering at 2000℃without any sintering aid.

关键词： silicon carbide(SiC)powders oxidation modification digital light processing(DLP) ultraviolet(UV)absorptivity curing depth

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Terahertz superconducting kinetic inductance detectors demonstrating photon-noise-limited performance and intrinsic generation-recombination noise

引用

Science China(Physics,Mechanics & Astronomy) 2022年第3期65卷 106-113页

作者： Qing shi Jing Li Qiang zhi Zheng Wang Wei Miao sheng-Cai shi Purple Mountain Observatory Chinese Academy of SciencesNanjing 210034China School of Astronomy&Space Science University of Science and Technology of ChinaHefei 230026China

The development of large-format detector arrays with background-limited performance is of particular interest at the terahertz(THz) band, which is a unique band in search of our cosmic origins. With high sensitivity and being more promising in the pixel number and multiplexing technology, superconducting kinetic inductance detectors(KID) are emerging as a major choice of detectors of this type. Here we fabricate three-THz-band(0.35/0.85/1.4 THz) KIDs on a single chip from a 120-nm-thick aluminum(Al) superconducting film and measure photon-noise-limited performance and intrinsic generation-recombination noise at high(>1 p W) and low(<1 f W) optical radiation power, respectively. Their responses to blackbody(optical) radiation are proven to be purely from photons compared with the responses of two dark KIDs intentionally arranged on the same detector chip. The lowest optical noise equivalent power(NEP) reaches 6×10^(-18)W/Hz^(0.5)and the optical coupling efficiency is in the range of 49%-56% for the three KIDs, which are in good agreement with the simulation results.

关键词： terahertz kinetic inductance detectors(KID) photon-noise generation-recombination noise

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：