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A novel approach to prevent bubble coalescence during measurement of bubble size in flotation

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Journal of Central South University 2014年第1期21卷 338-343页

作者：张炜 Jan E.Nesset james a.finch Mining and Mineral Resources Division Department of Business AdministrationChinalco China Copper Corporation Limited Department of Mining and Materials Engineering McGill University

Effect of frothers in preventing bubble coalescence during flotation of minerals has long been *** evaluate the performance of a frother,an apparatus to measure the bubble size is a basic *** Bubble Size Analyzer(MBSA) or bubble viewer that has been developed and completed by McGill University's Mineral Processing Group during the last decade is a unique instrument to serve this *** parameters which are thought to influence the bubble size measurements by McGill bubble viewer include water quality and frother concentration in the *** show that there is no difference in Sauter mean(D32) when tap or de-ionized water was used instead of process ***,the frother concentration,in this research DowFroth 250(DF250),inside the chamber exhibited a pronounced effect on bubble *** concentration below a certain point can not prevent coalescence inside the chamber and therefore caution must be taken in plant *** was also noted that the frother concentration which has been so far practiced in plant measurements(CCC75-CCC95) is high enough to prevent coalescence with the bubble viewer.

关键词： flotation frother bubble size bubble coalescence

Bubble size as a function of some situational variables in mechanical flotation machines

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Journal of Central South University 2014年第2期21卷 720-727页

The specific results of the work investigating the effect of gas density and water temperature on bubble size were *** were surrogate variables designed to investigate the effect of viscosity(varying water temperature) and altitude(varying gas density).The results show that there is a measurable but relatively small effect of gas density on bubble *** D32 is revealed to increase proportionally as(ρ0/ρg)*** projected impact on flotation kinetics at 4500 m versus sea level is small,of the order of 0.5% recovery loss for a bank of eight flotation *** effect of water temperature(4-40 °C) on bubble size is more significant than gas *** relationship correlates with water viscosity values quite closely.A finding that D32 increases proportionally as(μ/μ20)0.776 highlights the importance of accounting for viscosity effects if,for example,large process temperature fluctuations or deviation from design/test conditions are expected.

关键词： flotation frother bubble size viscosity altitude

Correspondence of bubble size and frother partitioning in flotation

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Journal of Central South University 2014年第6期21卷 2383-2390页

作者：张炜 Jan E.Nesset james a.finch Mining & Mineral Resources Division Department of Business AdministrationChinalco China Copper Corporation Limited Department of Mining and Materials Engineering McGill UniversityMontrealQCH3A 0C5Canada

The size of bubbles created in the flotation process is of great importance to the efficiency of the mineral separation ***,it is believed that frother transport between phases is perhaps the most important reason for the interactive nature of the phenomena occurring in the bulk and froth phases in flotation,as frother adsorbed in the surface of rising bubbles is removed from the bulk phase and then released into the froth as a fraction of the bubbles *** causes the increased concentration in the froth compared to the bulk concentration,named as frother *** reflects the adsorption of frother on bubbles and how to influence bubble size is not *** currently exists no such a topic aiming to link these two key *** fill this vacancy,the correspondence between bubble size and frother partitioning was *** size was measured by sampling-for-imaging(SFI)*** total organic carbon(TOC)analysis to measure the frother partitioning between froth and bulk phases was *** have shown,with no exceptions including four different frothers,higher frother concentration is in the bulk than in the *** results also show strong partitioning giving an increase in bubble size which implies there is a compelling relationship between these two,represented by CFroth/CBulk and *** CFroth/CBulkand D32 curves show similar exponential decay relationships as a function of added frother in the system,strongly suggesting that the frother concentration gradient between the bulk solution and the bubble interface is the driving force contributing to bubble size reduction.

关键词： flotation frother bubble size frother partitioning total organic carbon (TOC) analysis concentration gradient

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煤中全硫的快速简易燃烧法测定

地球与环境 1981年第11期 45-47页

作者： james finch ,余泽宇四川省煤田地质研究所

煤中全硫的测定方法,应能适合于含硫0.1—8％的各种类型和组分的煤。Jackson,Ahmed和Whalley,Budge和Macknight,以及Ladrach和Laarse描述了目前用于这种分析的经典的湿法的优缺点。这些方法的一个共同缺点是流程长,需要有手工操作的几... 详细信息

煤中全硫的测定方法,应能适合于含硫0.1—8％的各种类型和组分的煤。Jackson,Ahmed和Whalley,Budge和Macknight,以及Ladrach和Laarse描述了目前用于这种分析的经典的湿法的优缺点。这些方法的一个共同缺点是流程长,需要有手工操作的几个步骤。仪器法(例如x射线荧光法和元素分析器法)

关键词：煤中全硫燃烧管燃烧法铜丝布炉管铝丝螺丝接头滴定剂

Investigation of experimental observables in search of the chiral magnetic effect in heavy-ion collisions in the STAR experiment

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Chinese Physics C 2022年第1期46卷 129-145页

作者： Subikash Choudhury Xin Dong Jim Drachenberg james Dunlop ShinIchi Esumi Yicheng Feng Evan finch Yu Hu Jiangyong Jia Jerome Lauret Wei Li Jinfeng Liao Yufu Lin Mike Lisa Takafumi Niida Robert Lanny Ray Masha Sergeeva Diyu Shen Shuzhe Shi Paul Sorensen Aihong Tang Prithwish Tribedy Gene Van Buren Sergei Voloshin Fuqiang Wang Gang Wang Haojie Xu Zhiwan Xu Nanxi Yao Jie Zhao Fudan University Shanghai200433 Lawrence Berkeley National Laboratory BerkeleyCalifornia 94720 Abilene Christian University AbileneTexas 79699 Brookhaven National Laboratory UptonNew York 11973 University of Tsukuba TsukubaIbaraki 305-8571 Purdue University West LafayetteIndiana 47907 Southern Connecticut State University New HavenConnecticut 06515 State University of New York Stony BrookNew York 11794 Rice University HoustonTexas 77251 Physics Department and Center for Exploration of Energy and Matter Indiana University2401 N Milo B.Sampson LaneBloomingtonIN 47408 College of Physics and Technology Guangxi Normal UniversityGuilin541004 Central China Normal University WuhanHubei 430079 Ohio State University ColumbusOhio 43210 University of Texas AustinTexas 78712 University of California Los AngelesCalifornia 90095 Department of Physics McGill University3600 University StreetMontrealQCH3A 2T8 Wayne State University DetroitMichigan 48201 Huzhou University HuzhouZhejiang 313000

The chiral magnetic effect(CME)is a novel transport phenomenon,arising from the interplay between quantum anomalies and strong magnetic fields in chiral *** high-energy nuclear collisions,the CME may survive the expansion of the quark-gluon plasma fireball and be detected in *** the past two decades,experimental searches for the CME have attracted extensive interest at the Relativistic Heavy Ion Collider(RHIC)and the Large Hadron Collider(LHC).The main goal of this study is to investigate three pertinent experimental approaches:the$\gamma$correlator,the R correlator,and the signed balance *** exploit simple Monte Carlo simulations and a realistic event generator(EBE-AVFD)to verify the equivalence of the core components among these methods and to ascertain their sensitivities to the CME signal and the background contributions for the isobar collisions at the RHIC.

关键词： chiral magnetic effect anisotropic flow heavy-ion collisions quark-gluon plasma

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中国鸟类新纪录——欧金翅

干旱区研究 2000年第2期17卷 58-59页

作者：马鸣刘坪 Richard Lewthwaite Geoff Carey 林超英 Paul Leader james Hockett 中国科学院新疆生态与地理研究所乌鲁木齐830011 新疆天山西部林业局伊宁835000 香港观鸟会纪录委员会香港gpobox12460

In April 1994 and from June to November 1998, we found the European Green-finch Carduelis chloris many times in Ili Region, Xinjiang. It is a new record of the bird for China. The paper deals with the character, g... 详细信息

关键词：鸟类新纪录雀形目欧金翅新疆鉴别特征

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一种新型牵引头在水平定向钻进中的应用

非开挖技术 2017年第5期 8-14页

作者： james P. Murphy Tyler Horton Steve Meaders 于浩

2015年，在多伦多大范围地区（GTA）的项目中，最长距离的水平定向钻进之一是在Claireville水库和finch大道的交叉路口的42in孔径的，全长1185m（3888ft）的水平定向钻进。最初计划为开两个钻孔，出口点情况表明，单个孔的水平定向钻进... 详细信息

2015年，在多伦多大范围地区（GTA）的项目中，最长距离的水平定向钻进之一是在Claireville水库和finch大道的交叉路口的42in孔径的，全长1185m（3888ft）的水平定向钻进。最初计划为开两个钻孔，出口点情况表明，单个孔的水平定向钻进将更为合适。由于需要穿越的距离长并且需要穿越水库，这也是在该项目中定向钻进的关键穿越点之一。钻孔的大部分位置是处在没有使用表面套管的页岩之下因此，finch大道水平定向钻进和Claireville水库水平定向钻进在设计阶段结合起来，设计出一套长距离的考虑了技术交叉的水平定向钻进方案。由于这个交叉口的关键性质，这是该项目完成的第一个水平定向钻进，该工程在2015年1月初开始施工。在NPS42产品管回拉期间遇到困难，水平定向钻进承包商Meats设计了一个创新的伸缩回拖头来协助管道安装、本文将讨论交叉口设计、遇到的困难以及解决安装问题的“Claireville导弹”创新解决方案。总共有14个重要的水平定向钻进和3个直管安装，GTA项目是Enbridge Gas非开挖方面的重要项目。

关键词：水平定向钻进回拖头管道回拖