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Flotation behavior and electronic simulations of rare earth minerals in the presence of dolomite supernatant using sodium oleate col.e.tor

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Journal of Rare earths 2019年第1期37卷 101-112,M0005页

作者： e.R.l.e.piritu G.R.da Silva D.Azizi F.larachi K.e.Waters Department of Mining and Materials engineering McGill University Department of Chemical.e.gineering Université Laval

Common rare earth(Re) minerals, such as bastnasite and monazite, may be formed in deposits associated with carbonate gangue, such as calcite and dolomite. Sodium oleate is a widely used col.e.tor for the flotation of both Re and gangue minerals, which might, therefore, be an inefficient process due to the lack of selectivity of this col.e.tor. Since these minerals are also sparingly soluble in solution, they could release their constituent ions into the solution, which could affect the floatability of other minerals. In this study, the interactions of sodium oleate with bastnasite and monazite in the presence of dissol.e. dolomite species have been investigated. Microflotation tests were carried out to explore the effects of these dissol.e. species on the floatability of the Re minerals. Zeta potential measurements and XPS characterization were carried out to understand how the species affect the col.e.tor adsorption. To complement these characterizations, density functional theory(DFT) simulations were conducted to investigate the col.e.tor-mineral and col.e.tor-adsorbed species(on the mineral surface) *** results show that col.e.tor-dolomite interaction energy is greater than that of col.e.tor-adsorbed species, but lower than col.e.tor-monazite interaction energy, explaining the decrease in the minerals' recovery upon exposure to the dissol.e. mineral species. It is also shown that oleate ions(OI^-) have the strongest interaction with the minerals compared to other oleate species such as acid soap(HOI_2^-) and oleate dimer(OI_2^(2-)). The behavior(strength and selectivity) of sodium oleate towards Re minerals and dolomite, as compared to other Re mineral col.e.tors(such as aromatic hydroxamate), is attributed mainly to the col.e.tor's and the minerals' structure. The long hydrocarbon chain of sodium oleate which imparts hydrophobic characteristic to the minerals, makes it stronger col.e.tor than ***, sodium oleate(with linear str

关键词： Rare earth minerals Bastnsite Monazite Dolomite Sodium oleate DFT simulation

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Contemporary business louic e. Boone. David l. Kurtz 10th ed.

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Contemporary business Louic E. Boone. David L. Kurtz

Pathophysiology : The Biologic Basis for Disease in Adults and Children / Kathryn l. McCance, Sue e. Huether.

2002年

作者： louic e. Boone. David l. Kurtz

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Pathophysiology : The Biologic Basis for Disease in Adults a...

2006年

作者： Kathryn l. McCance Sue e. Huether.

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西方致富之路

西方致富之路

1989年

作者：（美）内森·罗森堡 l.e.小伯泽尔刘赛力等译周兴宝校

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风浪绕射的模拟计算

水利水运工程学报 1974年第S2期 97-107页

作者：范守善 l.e.博格曼姚国权

本文论述了关于防波堤后风浪绕射的数字计算模型。该模型将流体力学理论和诃向谱的概念结合起来。它不仅可用于防波堤后风浪绕射问题的研究,而且也可用来检验其它的试验(或野外)数据分析方法。提出了关于最佳数据长度、滞后数以及波浪... 详细信息

本文论述了关于防波堤后风浪绕射的数字计算模型。该模型将流体力学理论和诃向谱的概念结合起来。它不仅可用于防波堤后风浪绕射问题的研究,而且也可用来检验其它的试验(或野外)数据分析方法。提出了关于最佳数据长度、滞后数以及波浪计布胃中的波浪计间隔方面的广泛研究。

关键词：修匀密度风浪波浪等式谱密度函数数据长度正态分布 Gauss 分布防波堤阻浪堤海上构筑物协方差函数

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地热钻探技术(下)

钻探工程 1981年第6期 54-60页

作者： l.e.卡帕诺 ,耿俊峰

在9(5/8)英寸套管下钻进，在绝大多数热水地区，与油田钻进非常相似。因为钻进的地层是沉积层，相对较软。钻井液不是单一的褐煤、搬土、水的泥浆，因为其温度只适用于200°F以下。更为完善的是绿坡缕土泥浆或海泡石泥浆，在高温环境下... 详细信息

在9(5/8)英寸套管下钻进，在绝大多数热水地区，与油田钻进非常相似。因为钻进的地层是沉积层，相对较软。钻井液不是单一的褐煤、搬土、水的泥浆，因为其温度只适用于200°F以下。更为完善的是绿坡缕土泥浆或海泡石泥浆，在高温环境下更稳定因而得以应用。

关键词：泥浆泵钻井泵杂质泵地热钻探生产层地层地热井地层条件生产套管套管头井口装置(采油) 井口装置空气钻进钻井液冲洗液地热钻井

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工业投资项目的经济分析 1

工业投资项目的经济分析

Assessing display variability in wild brown anoles Anolis sagrei using a mechanical lizard model

丛书名：现代管理译丛

1985年

作者：（美）布西（Bussey l.e.）陈启申等译

本书介绍了与经济分析有关的基本概念，确定条件下的投资分析，有风险和不确定性条件下的投资分析等内容

ISBN: (纸本)15033·5859

本书介绍了与经济分析有关的基本概念，确定条件下的投资分析，有风险和不确定性条件下的投资分析等内容

关键词：工业项目投资经济活动分析

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Current Zoology 2011年第2期57卷 140-152页

作者： Sarah R. PARTAN Peter OTOVIC Virginia l. PRICe Scott e. BROWN School of Cognitive Science Hampshire College Amherst MA 01002 USA Department of Psychology University of South Florida St. Petersburg FL 33701 USA

Signals used for species identity ought to be highly stereotyped so as to facilitate immediate recognition by conspecifics. It is surprising therefore to find variability in putative species signature displays. The brown anole Anolis sagrei has a high degree of variability in its signature bobbing display. In this study we col.e.ted descriptive data on variability in the temporal structure of wild brown anole bobbing patterns, finding that no two displays analyzed had the same temporal structure, and we also tested whether wild brown anoles prefer the signature display over an al.e.nate display pattern by using mechanical robot playbacks in the field. As a response metric we assessed whether or not the lizards showed social responses （pushup, dewlap extension, or head-nod） in response to the robotic presentations. We found that the lizards responded slightly more to the signature than to the al.e.nate pattern, providing support for the idea that despite the variability seen in displays, the signature pattern is meaningful to them. We tested two other independent variables： speed of the display and elevation of the robot during its display, neither of which was significant. Dewlap extensions were given predominantly by adult males and were more likely to be given in the breeding season than the nonbreeding season. Pushups and head-nods were given equally by males and a combined class of females and juveniles, and were not seasonal. Head-nods increased after the robot turned off, suggesting that they may be used in a conversational turn-taking style during communication .

关键词： Species recognition ethorobotics Visual signals Territoriality Signature display Sex differences

MODelING OF 'BANDING' MICROSTRUCTURe FORMATION IN CeNTRIFUGAllY SOlIDIFIeD Ti-6Al-4V AllOY

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Acta Metallurgica Sinica(english letters) 2008年第6期21卷 399-408页

作者： D.R. liu e：J. Guo l.P. Wang School of Materials Science and engineering Harbin University of Science and Technology Harbin 150040 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Numerical investigations of the ＇banding＇ microstructure formation during solidification of Ti-6Al-4 V alloy in the centrifugal casting are conducted using a multi-scale model, which combines the finite difference method （FDM） at the macroscale with a cellular automaton （CA） model at the microscale. The macro model is used to simulate the fluid flow and heat transfer throughout the casting. The micro model is used to predict the nucleation and growth of microstructures. With the proposed model, numerical simulations are performed to study the infl.e.ces of the nucleation density, mould rotation speed, and casting size upon the ＇banding＇ microstructure formation. It is noted that changing the nucleation density has a minor effect on the microstructure formation. The rotation speed promotes the formation of ＇banding＇ microstructure, which is more noticeable for larger size castings. The ＇major mechanism responsible for this ＇banding＇ phenomenon is the spatial variation in cooling rates created by centrifugal force.

关键词： Modeling 'Banding' microstructure Ti-6Al-4V alloy Centrifugal casting

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