盐酸改性煅烧高岭土的制备及表征

为了研究高岭土煅烧以及煅烧再改性后的结构变化,将鄂尔多斯高岭土分别在200、400、600、800℃下煅烧,得到煅烧高岭土试样,再将煅烧高岭土分别用质量分数5%和25%的盐酸进行改性,得到酸改性煅烧高岭土.采用XRD、FT-IR、SEM等手段进行表征分析.结果表明,在600℃的煅烧温度下高岭土的结构没有发生变化;当温度高于600℃煅烧时高岭土的结构发生了明显变化,已转变成偏高岭土;盐酸改性煅烧过的高岭土不能改变煅烧高岭土的结构.     

高岭土悬液絮凝形态研究

以高岭土水溶液为絮凝对象,利用复合型生物絮凝剂CBF对高岭土悬液的絮凝形态进行系统分析。通过对高岭土粒度及表面特性的分析,高岭土水溶液中颗粒之间存在静电排斥力。原子力显微镜观察其絮凝形态发现絮体结构密实,有利于絮体沉降。电动电位测定结果得出,未投加CBF的高岭土水溶液的胶体颗粒则保持稳定状态不易聚沉。     

插层高岭土的制备及其电流变性能

以肼为客体采用水热法对高岭土进行插层处理,获得插层率较高的插层高岭土.以插层高岭土为分散质、甲基硅油为连续相制备复合电流变液.利用X射线衍射(XRD)、红外光谱(FTIR)、电流变液测试装置等对插层高岭土进行结构表征及电流变液性能分析.讨论水热处理温度、肼质量分数、酸碱度对插层率的影响,以及高岭土插层对电流变液效应的作用.结果表明,在160℃的条件下,用质量分数为50%的肼溶液插层处理高岭土可以得到插层率59%的插层高岭土;水热法在肼插层高岭土制备方面效果明显;肼分子进入到高岭土层间,导致其层间距由0.714 nm增加至1.037 nm;插层高岭土电流变液的电流变性能明显优于未插层高岭土电流变液.     

高比表面积煤系高岭土材料的制备及其结构表征

高比表面积改性煤系高岭土具有优异的性能,现已被广泛地应用于多种行业。本文以内蒙煤系高岭土为原料,将其高温煅烧制得偏高岭土后,再经盐酸改性用以制备高比表面煤系高岭土材料;通过X射线衍射(XRD)、差热-热重分析(DTA-TGA)和N2吸附-脱附等手段对改性前后煤系高岭土的晶体结构及比表面积进行了表征,实验考察了煅烧温度、煅烧时间、盐酸用量、盐酸浓度及反应时间对煅烧煤系高岭土比表面积的影响,确定了酸改性煤系高岭土的最佳工艺条件;在最佳工艺条件下制备的盐酸改性煤系高岭土材料的比表面积高达465 m2/g。     

煤系高岭土矿层回采工艺

对淮北矿业集团某矿多年来在高岭土开采工艺改进方面进行了分析与研究,对高岭土工作面综采设备配套选型进行了介绍和总结,分析了工艺革新对于高岭土工作面生产效率和经济效益的促进作用。     

高比表面改性煤系高岭土吸附次甲基蓝的研究

以高比表面改性煤系高岭土为吸附剂,分析了吸附时间、吸附剂用量、pH和染料初始浓度等因素对改性煤系高岭土吸附次甲基蓝染料的影响,并对改性煤系高岭土的再生效果进行了研究.静态吸附结果表明:改性煤系高岭土的用量为0.2g;pH为6.012时,改性煤系高岭土对次甲基蓝有较好的吸附;吸附时间取30min为宜.改性煤系高岭土对次甲基蓝的吸附等温线拟合结果表明,该吸附过程符合Langmuir吸附等温式,属于单分子层吸附,改性煤系高岭土对次甲基蓝的吸附符合拟二级动力学方程.     

雨水酸化条件对高岭土改性沥青路面腐蚀性能的试验模拟

在酸雨条件下,为提高路面抗腐蚀性能的最佳高岭土掺量,探究酸雨对高岭土改性沥青路面腐蚀性能的影响.在pH值为2.0, 4.0,5.6,7.0时,采用周期浸泡、加速腐蚀的试验方法,依次研究高岭土改性沥青混合料的变化情况.试验结果表明:不同pH值的酸雨对4种不同高岭土掺量的沥青混合料均有侵蚀作用,但掺加高岭土的马歇尔试件明显好于基质沥青试件;通过宏观实验及微观分析,当高岭土掺量为3%时,高岭土改性沥青混合料抗腐蚀性能最佳.     

张掖市山丹地区煤系硬质高岭土资源的综合开发利用研究

文章结合国家宏观经济政策,研究分析了张掖市山丹地区煤系硬质高岭土资源和煤系高岭土的生产加工利用现状;对山丹地区煤系高岭土的综合开发、加工利用方向;并对生产工艺的可行性和市场需求状况进行了研究分析,提出了综合开发和加工利用方向和建议。     

高岭土精细化处理

研究了天然高岭土的精细化处理．等离子体光谱分析、白度分析、粒度分析表明，高岭土的理化性能已得到明显改善，适合工业应用．     

高岭土生物除铁实验及动力学分析

利用异化铁还原微生物去除高岭土中的3价氧化铁杂质,研究pH和温度对高岭土中3价氧化铁去除的影响,分析了高岭土生物除铁过程中pH、UORP和葡萄糖质量浓度变化趋势.采用Logistic方程对不同pH去除高岭土中3价铁杂质的过程进行拟合.结果表明:pH和温度对高岭土生物除铁有较大的影响,生物除铁的最适pH为7,最适温度为30 ℃.在生物除铁过程中葡萄糖质量浓度、pH及UORP均随着高岭土中的3价氧化铁去除量的增加而降低.     

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