检索结果-南通市图书馆

Journal of Iron and Steel Research International 2022年第5期29卷 772-782页

作者： Bao Liu Jin Li Qian-qian Ren Shuang Cai Xue Yang Ya-nan Zeng Jun-guo Li College of Metallurgy and Energy North China University of Science and TechnologyTangshan063210HebeiChina

The sodium roasted-acid leaching tailing(SRALT)of vanadium slag with a certain amount of vanadium exhibits potential environmental *** investigate the leaching behavior of vanadium from the SRALT,neutral batch leaching tests were *** evolution of vanadium concentration,pH,redox potential(Eh),dissolved oxygen,and conductivity as a function of time was *** diagrams of V–H2O system with different vanadium concentrations were obtained to identify the ionic speciation of vanadium in leachate.X-ray diffraction,X-ray photoelectron spectroscopy,field emission-scanning electron microscopy,and thermogravimetry–differential scanning calorimetry analysis were conducted to investigate the mineralogical evolution of the SRALT during the leaching *** was found that the major minerals of the original SRALT are titanomagnetite,spinel,olivine,and *** valence states of V existing in the original SRALT are V^(3+)and V^(5+).The pH and Eh values of the obtained leachates are 10.00–10.58 and(−43)–(+67)mV,*** this pH and Eh region,the released vanadium is mainly present as HVO_(4)^(2−).The FeOOH and CaCO_(3)would form during the leaching *** HVO_(4)^(2−)would be mainly adsorbed by the FeOOH and slightly incorporated into the CaCO_(3),resulting in the decline in the vanadium *** vanadium concentration above 27 mg L^(−1)and the dissolved oxygen value below 5.0 mg L^(−1)can be obtained after a short leaching *** a V(V)-releasing and oxygen-depleting substance,the leaching toxicity of the SRALT should not be ignored.

关键词： Vanadium Vanadium slag Tailing Leaching toxicity mineralogical analysis

Using computational fluid dynamic simulation with Flow-3D to reveal the origin of the mushroom stone in the Xiqiao Mountain of Guangdong, China

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

Journal of Mountain Science 2022年第1期19卷 1-15页

作者： LI Jian-cheng WANG Wei ZHENG Yan-ming WEN Xiao-hao FENG Jing SHENG Li WANG Chen QIU Ming-kun Department of Geography Hanshan Normal UniversityChaozhou 521041China Geographic School South China Normal UniversityGuangzhou 510631China

Mushroom shaped rocks are not uncommon in nature, but their origin is often misunderstood because they can be formed by different natural forces. A huge mushroom stone in a stream valley of the Xiqiao Mountain of Guangdong,China is widely believed to be formed through the way of stream water erosion. However, the result of the simulation performed with Flow-3 D in this study indicates that the mushroom shape of the rock could not have been sculpted by the flowing water erosion because the simulation result contradicts that of the field investigations:(1) the sediment brought by upstream flowing water tends to be deposited on the leeward side of the flowing water preventing the rock on this side form being eroded, but the narrowest part of the rock bottom is exactly located on this side of the rock and(2) the stream flow should erode the bed sediment and produce high abrasion on the rock surface on the upstream and lateral sides of the rock,respectively, but no abrasion marks are found on the same sides of the rock. Subsequent geological analyses in this study provide evidence that the narrow bottom of the mushroom stone was resulted from chemical and physical weathering happening within the sediment that used to deposit on the lee side of the stone.

关键词： Mushroom Stone Computational fluid dynamics(CFD)model mineralogical analysis Chemical weathering Xiqiao Mountain happening

Plasticity role in strength behavior of cement-phosphogypsum stabilized soils

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2022年第6期14卷 1977-1988页

作者： Xia Bian Lingling Zeng Feng Ji Ming Xie Zhenshun Hong Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing210098China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou221116China College of Civil Engineering Zhejiang University of TechnologyHanzhou310014China Jiangsu Water Source Company Ltd.of the Eastern Route of the South-to-North Water Diversion Project Nanjing210000China Fujian Yongfu Power Engineering Co Fuzhou350108China Institute of Geotechnical Engineering School of TransportationSoutheast UniversityNanjing211189China

Dredged soil and phosphogypsum are frequently regarded as wasted materials,which require further treatment to control their environmental ***,phosphogypsum is proposed as a binder to stabilize dredged soil,aiming at efficiently reducing and reusing these waste *** this study,the engineering properties of cement-phosphogypsum stabilized dredged soils were investigated through a series of unconfined compression tests,and the effects of plasticity index of original soils on the strength improvement were ***,the microstructure test and mineralogical test were performed to understand the mechanism of physical role of original soils in strength *** results revealed that the unconfined compressive strength significantly decreased with the increase in plasticity index at the same binder *** essential factor for strength improvement was found to be the formation of cementitious materials identified as calcium silicate hydrate(CSH),calcium aluminate hydrate(CAH),and ettringite(Aft).The normalized integrated intensity of cementitious materials(CSH+CAH+Aft)by pore volume decreased with the increase in plasticity ***,the density of cementitious materials filling the soil pores controlled the effectiveness of strength *** cementitious materials per pore volume were observed for the original soils with lower values of plasticity *** is,the higher strength of stabilized soils with lower values of plasticity index was attributed to a packed structure forming by integrated fabric through denser cementitious *** can be anticipated from the above findings that the effectiveness of stabilization treatment will significantly reduce with the increase in plasticity of origin soil.

关键词： Strength Stabilization Plasticity index Microstructure mineralogical analysis

Tracing sediment transport history using mineralogical fingerprinting in a river basin with dams utilizing sediment sluicing

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2023年第3期38卷 469-480页

作者： Kenichi Ito Motohide Matsunaga Tomoya Itakiyo Hiroyuki Oishi Kei Nukazawa Mitsuteru Irie Yoshihiro Suzuki Center for International Relations University of Miyazaki Department of Civil and Environmental Engineering Faculty of Engineering University of Miyazaki Oita Prefectural Government West Japan Engineering Consultants Inc.

Sediment causes a serious problem in relation to dam function. A cooperative sediment sluicing operation has been under way since 2017 to prevent sediment from accumulating in dams in the Mimi River,Miyazaki, Japan. To achieve a smooth and stable operation, it is very important to determine the sediment source and a sediment transport system to maintain the dam’s function. In the current study, the source and transport of sediment from the Mimi River basin have been analyzed with X-ray diffraction(XRD) to reveal the peaks of mineral species. The sediment samples were collected in the Mimi River basin from the Tsukabaru Dam to the sea in an area including 4 dams and 5 tributaries. In addition, the minerals in samples collected in 2014, before the start of the sediment sluicing operation, and from 2018 to 2020, after the start of the operation, were analyzed. An evaluation of the similarity of the sediment at each sampling point based on the X-ray diffraction peaks of mineral species showed that sediment distributed upstream was transported downstream in the year when the sediment sluicing was *** result indicates that the sediment sluicing operation at dams ensured the continuity of the sediment distribution in the Mimi River basin. In addition, an investigation done in 2020 showed that sediment particles very similar to those of the upstream tributaries were deposited downstream because of extensive flooding caused by a large typhoon. The management of sediment transport has the greatest importance in a river basin where a dam is to be constructed. It is possible to trace the history of the sediment distribution and movement resulting from the operation of sediment sluicing by using sediment mineral analysis.

关键词： Sediment sluicing Sediment source X-ray diffraction (XRD) mineralogical analysis Cluster analysis

Comparative study on bioleaching of two different types of low-grade copper tailings by mixed moderate thermophiles

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2018年第9期28卷 1847-1853页

作者： Xiao-dong HAO Xue-duan LIU Qin YANG Hong-wei LIU Hua-qun YIN Guan-zhou QIU Yi-li LIANG School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Key Laboratory of Biometallurgy of Ministry of Education Central South UniversityChangsha 410083China

The bioleaching of two different types of low-grade copper tailings,acid-leaching tailings(ALT)and copper flotation tailings(CFT)by mixed moderate thermophiles,and the variation of mineralogical and microbiological characteristics during their dissolution processes were comparatively *** showed that bioleaching behaviors of the two types of tailings were significantly *** ALT bioleaching,lower redox potential,higher[Fe3+]/[Fe2+]ratio and higher cell density in solution were *** resulted in higher total copper,primary copper sulfide and secondary copper sulfide extractions,compared with CFT bioleaching.X-ray diffraction analysis suggested that gypsum and some metal organic complexes were detected in CFT bioleaching,which could cause the sluggish oxidation of sulphide *** shifts of microbial community in the leachates and leaching residues varied greatly between ALT and CFT *** percentage of iron-oxidizing bacteria in ALT bioleaching was higher than that of CFT,but the sulfur-oxidizing bacteria percentage was the *** archaeon *** L1 was detected in ALT but not in CFT.

关键词： bioleaching tailings microbial community dynamics mineralogical analysis

Pulmonary sarcoid-like granulomatosis induced by aluminum dust:report of a case and literature review

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2007年第17期120卷 1556-1560页

作者： CAI Hou-rong CAO Min MENG Fan-qing WEI Jing-yi Department of Pulmonary Medicine Affiliated Drum TowerHospital Nanjing University School of Medicine Nanjing 210008China

Awide range of pulmonary pathology is attributed to aluminum dust exposure, including interstitial fibrosis^1-5 desquamative interstitial pneumonia^6 and pulmonary alveolar proteinosis^7 To our knowledge, granulomatous lung disease induced by aluminum dust is rare, only two cases were reported in literatures^8.9 We had the opportunity to make a diagnosis of pulmonary sarcoid-like granulomatosis in a patient exposed to aluminum dust. Herein, we report the clinical history, radiographic and histopathological findings in this patient, and the detailed mineralogical analyses performed on lung tissue obtained by open lung biopsy.

关键词： aluminum dust granulomatosis scanning electron microscopy energy-dispersiveradiograph analysis mineralogical analysis

Properties of Debadib Evaporates (Northern Tunisia) for Potential Use in Industrial Fields

在线全文

学校读者我要写书评

暂无评论

Open Journal of Geology 2016年第12期6卷 1525-1538页

作者： Imed Ben Salah Moufida M’barek Jemaii Narjess Karoui-Yaakoub Ali Sdiri Noureddine Ben Ayed Department of Geology Sciences University of Bizerte Bizerte Tunisia Department of Georesources and Environment National Engineering School University of Sfax Sfax Tunisia

Gypsum is widely distributed in Tunisia occurring in the formation of Triassic age. The gypsum deposit of Mellegue is the alabastine type with a little of the porphyroblast type and contains traces of clay minerals and calcite. It is a moderately strong rock in terms of its unconfined compressive strength of 16 Mpa and tensile strength of 3.35 Mpa. Triaxial testing values indicated an apparent cohesion of 10 Mpa and an angle of friction of 26°. The gypsum studied had a percentage of SO3 of 41.71% and a percentage of CaO of 32.9%. All the samples had low densities according to the International Association of Engineering Geology (IAEG) classification and exhibited a moderate porosity whether effective or absolute. The gypsum proved to be moderately strong when tested in unconfined compression and tensile strength. Thermal analysis indicated a total weight loss of 20.27% and the whiteness index about 90%. This proved a high degree of whiteness. The time of setting can be considered short and medium, which is quite favorable for industrial application compared with other gypsum deposits currently operated.

关键词： Triassic Gypsum Deposit mineralogical analysis Physicochemical analysis Geotechnical Testing Industrial Use

铁成分对硫化锌精矿的半导体性质及化学反应性的影响

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

有色金属 1989年第4期41卷 55-67页

作者：熊小勇 Michelle JACOB-DULERE 东北工学院赴比利时比利时蒙斯理工学院

硫化锌精矿(以下简称精矿)除含有主要元素锌与硫外,还含有其它元素,尤其是含有相当多的铁。在湿法处理精矿时,其铁成分的行为取决于铁的矿物存在形式。精矿中的铁可以铁闪锌矿[(Zn,Fe)S)、黄铁矿、黄铜矿的形式存在。铁闪锌矿的铁含量... 详细信息

硫化锌精矿(以下简称精矿)除含有主要元素锌与硫外,还含有其它元素,尤其是含有相当多的铁。在湿法处理精矿时,其铁成分的行为取决于铁的矿物存在形式。精矿中的铁可以铁闪锌矿[(Zn,Fe)S)、黄铁矿、黄铜矿的形式存在。铁闪锌矿的铁含量可在很大的范围内变化,其物理化学性质也随铁含量而变化,因此对精矿的湿法直接处理产生很大的影响。本文研究出一种可靠的、确定精矿矿物组成的化学分析方法,着重于测定铁在精矿各矿物中的分布,及铁闪锌矿铁含量的变化规律。在此基础上,实验研究了精矿中的铁(尤其是铁闪锌矿中的铁)对精矿的半导体性质的影响规律,应用半导体电化学原理讨论了精矿铁含量对精矿的直接浸出(常压、硫酸介质)的影响机理。

关键词： Blende Sphalerite Marmatite Zinc concentrate Goethite Hematite mineralogical analysis Electric conductivity Reactivity Direct leaching Iron precipitation