载金黄铁矿新型捕收剂2-甲基-5-己基黄药捕收性能及其作用机理

通过对2种不同地点、不同含金品位黄铁矿的单矿物和实际矿石浮选试验,研究新型捕收剂2-甲基-5-己基黄药(ZJ-6)与丁基黄药对比下的含金黄铁矿捕收性能。利用红外光谱分析和紫外吸附量测试等技术以及浮选理论研究新型捕收剂ZJ-6的作用机理和构效关系。研究结果表明:新药剂ZJ-6的波长明显比常规黄药的高,说明随着黄药碳链碳原子数增加,药剂的亲固能力明显提高,而当碳原子数大于4个时,药剂的亲固能力变化较小,本文设计的新药剂通过改变碳链长度和非极性基的电子效应,增加疏水性能的同时增加了药剂的亲固能力,提高药剂捕收性能。     

捕收剂CSU-A与黄铜矿作用机理

通过矿物浮选实验、吸附量测试以及红外光谱分析,研究CSU A与黄铜矿和黄铁矿相互作用的规律.浮选实验结果表明,当CSU A的质量浓度为6mg/L,溶液pH值为9.0～9.5时,CSU A对黄铜矿捕收能力强,对黄铁矿捕收能力弱;红外光谱分析结果表明,捕收剂CSU A与黄铜矿和黄铁矿作用前、后的红外光谱图明显不同,在黄铜矿与药剂作用后出现了6cm-1的波数位移,而黄铁矿与捕收剂作用前、后的红外光谱图基本上没有变化.由此可以确定,捕收剂CSU A在黄铜矿表面发生了化学吸附,而在黄铁矿表面仅是简单的物理吸附.捕收剂CSU A具有选择性的主要原因是在黄铜矿和黄铁矿表面发生吸附的形式不同.     

捕收剂CSU31对黄铜矿和黄铁矿浮选的选择性作用

通过浮选实验、吸附量和动电位测定,考察捕收剂CSU31对黄铜矿和黄铁矿浮选性能的影响及作用机理。研究结果表明:当pH=2.7~12.0时,CSU31对黄铜矿的捕收能力强,最大回收率达到93%,而对黄铁矿的捕收能力弱,在pH为7.0~12.0时,其回收率小于10%;当pH为7.0~11.0时,用CaO作pH调整剂,黄铁矿回收率低于5%;CSU31在黄铜矿和黄铁矿表面的吸附量均随着CSU31用量的增加而增大,但捕收剂在黄铜矿表面的吸附量明显大于在黄铁矿表面的吸附量,CSU31的吸附造成矿物表面的动电位往负的方向移动,而且使黄铜矿表面的动电位负移较大。     

几种羟肟酸捕收剂与白云石作用机理研究

为了更好的揭示羟肟酸类捕收剂与白云石作用机理,利用Materials Studio(MS)软件建立羟肟酸捕收剂在白云石矿物表面的吸附模型,通过分子模拟技术模拟计算了真空环境下药剂分子与白云石矿物的相互作用能。从原子尺度揭示了捕收剂在白云石浮选中的捕收机理,研究表明吸附能的差异是导致捕收剂选择性捕收的根本原因。     

几种羟肟酸捕收剂与氟磷灰石作用机理研究

为了更好地揭示羟肟酸类捕收剂与氟磷灰石作用机理,利用Materials Studio(MS)软件建立羟肟酸捕收剂在氟磷灰石矿物表面的吸附模型,通过分子模拟技术模拟计算了真空环境下药剂分子与氟磷灰石矿物的相互作用能,从原子尺度揭示了捕收剂在氟磷灰石浮选中的捕收机理。研究表明,羟肟酸捕收剂对氟磷灰石没有捕收性能。     

方铅矿与黄铁矿浮选分离的矿浆电化学研究Ⅲ．方铅矿与黄铁矿混合精矿的浮选分离

以丁基黄药为捕收剂的方铅矿与黄铁矿混合精矿体系，按照电位与可浮性的关系，两矿物在还原性矿浆电位浮选分离的电位差在热力学上仅为５０ｍＶ，而在动力学上达到了２０７ｍＶ。采用接触角测定、单矿物浮选、混合矿分离等方法，可以证实依据方铅矿表面丁基黄原酸铅和黄铁矿表面丁基双黄药的电化学还原动力学性质的差异，实现方铅矿与黄铁矿混合精矿的电化学浮选分离。     

脂类捕收剂DLZ对黄铁矿浮选的影响及其作用机理

通过浮选实验,吸附量和红外光谱测定,考察脂类捕收剂DLZ对黄铁矿可浮性的影响及作用机理.研究结果表明,DLZ在整个pH范围内对黄铁矿的捕收能力弱,黄铁矿回收率小于24%;在低铜离子浓度(1 mol/L)下,对黄铁矿回收率影响不大;当铜离子浓度增加至4 mol/L,pH值为2.7时,黄铜矿回收率达到42%;在碱性条件下,黄铁矿回收率与不加铜离子时的回收率相当;DLZ在黄铁矿表面的吸附量随其用量的增加而增大;加入铜离子对DLZ在黄铁矿表面的吸附有促进作用;DLZ与黄铁矿作用前后,以及加入铜离子后的红外光谱图基本没有变化,即DLZ在黄铁矿表面的吸附属于物理吸附;加入CaO后在873.7 cm-1和797.7 cm-1处出现2个吸收峰,表明黄铁矿表面附着Ca(OH)2等含钙的化合物,阻止了DLZ在矿物表面的吸附,降低了黄铁矿的可浮性.     

氢化松香酯基阳离子捕收剂M--N的合成及浮选性能

以石英纯矿物浮选回收率和季铵盐活性物含量为指标,进行了摩尔比、温度、时间等合成条件的优化.以酒钢焙烧磁铁矿实际矿石在捕收剂M-N作用下进行脱硅反浮选,所得铁精矿品位56.54%、回收率77.33%.在5~30℃ 条件下,浮选精矿指标稳定,耐低温性优良.捕收性能优于传统药剂十二胺和醚胺.Zeta电位和红外光谱分析表明,M-N在石英表面发生静电吸附作用和氢键作用,因此加强了浮选分离的效果.     

捕收剂CSU-M对镍钼矿中氧化钼的浮选工艺及吸附机理

针对镍钼矿中氧化钼浮选回收率低,丢弃造成资源浪费和环境污染等问题,在工艺矿物学研究基础上,对镍钼矿中硫化矿物浮选尾矿进行开路实验和闭路实验,设计出氧化钼浮选流程,并利用分子动力学模拟研究捕收剂分子在矿物解离面的吸附过程。研究结果表明:镍钼矿中硫化矿物浮选尾矿主要含钼矿物为氧化钼,脉石矿物主要为磷灰石和黄铁矿;通过闭路浮选试验得到Mo品位为3.37%,Ni品位为3.75%,Mo回收率为71.22%,Ni回收率达67.81%的精矿;捕收剂CSU-M分子在氧化钼(100)面吸附比磷灰石(010)面和黄铁矿(110)面吸附强,从而实现浮选过程中氧化钼与磷灰石和黄铁矿的分离。     

胺类捕收剂对铝硅矿物的浮选性能研究

通过浮选实验、动电位测定、红外光谱测试、结构／性能及量化计算，研究了十二胺、N，N-二甲基十二胺、N-十二烷基-1，3-丙二胺三种药剂的结构和物化性质，讨论了它们对高岭石、叶腊石和伊利石的表面电性及浮选行为的影响．结果表明：胺类化舍物易阳离子化，在铝硅矿物表面主要发生了静电吸附，多胺和叔胺在矿物表面吸附后，能显著改变矿物的ζ-电位；当药剂分子中引入亚氨基，药刑与矿物的氧键作用也变为明显；药剂所含N数越多、N上烃基越多，药剂的阳离子化趋势越强；基团电负性、浮选剂特性指数、水油平衡度和疏水链长等物化参数表明胺类捕收剂对铝硅酸盐类矿物捕收性能的决定因素是极性基的特性，而因为高岭石晶体的特殊性，疏水链长对其在微酸性、中性和微碱性条件下捕收有特别的影响；捕收矿物的能力为多胺〉叔胺〉脂肪伯胺；应用于铝土矿反浮选以N-十二烷基-1，3-丙二胺为最佳．     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that