提高管磨产能技术探讨

文章就提高管磨产能而对管磨及附属设备进行改造和对配球方案、工艺技术条件等方面进行了技术探讨，并提出了磨矿技术改进的发展方向。     

SABC碎磨工艺设计及其在金属矿选矿厂的应用实践

该文介绍了SABC工艺流程的结构及其特点,总结了SABC工艺流程的应用条件和目前常用的几种实验室试验方法,提出了提高SABC碎磨系统稳定性的几种关键措施.同时对目前两个应用实践效果良好的SABC碎磨工艺选矿厂进行了介绍.     

某磁铁矿选厂细磨工艺优化研究

根据某磁铁矿选厂流程考查结果,对细磨设备工作状况进行了分析,指出了细磨设备及工艺存在的问题：球磨机磨矿效率低,补球尺寸过大;水力旋流器分级效率低,沉砂中合格细粒含量较高造成过粉碎严重。提出了细磨作业优化提高的措施：球磨机补球尺寸由40 mm调整为10～20 mm,并适当减少装球量;水力旋流器安装压力表监控给料压力以提高分级效率,或采用开路细磨,最终达到节能降耗的目的。     

搅拌磨与球磨磨矿对比试验

研究了搅拌磨和球磨磨矿产品的粒度特性及其磨矿过程中的比生产率、能耗情况.结果表明:搅拌磨磨矿产品较为均匀,球磨磨矿产品中微细粒和粗颗粒的质量分数较高;分别采用直线和指数曲线拟合搅拌磨和球磨时不同入磨粒度和比生产率的关系,随着入磨粒度的下降,球磨的比生产率下降较搅拌磨明显;采用Walker等提出的关系式,拟合入磨粒度与能量消耗的关系,搅拌磨的耗能增长速率远小于球磨的增长速率.搅拌磨相对于球磨在细磨和超细磨过程中具有明显的优势.     

滚磨加工中磨块的特性参数对滚磨效果的影响

本文简要分析了滚磨加工的机理。在此基础上，具体阐述了滚磨加工中磨块的工作条件及基本要求，并通过具体试验，分析了磨块的硬度、粒度、形状及大小对工件表面粗糙度、加工效率及经济性的影响。最后，总结出切合实际应用的三个结论。     

钻石加工的刷磨和剔磨分析

剔磨及刷磨,在钻石加工惯用的流程内,可以存留钻石成品应有的克拉质量,消除掉潜藏的多样瑕疵.刷磨及剔磨惯用的方式,是增添原有的倾角,或限缩这样的倾角.为此,有必要经由归结,得来可用的工艺参数.在这以后,就能运算得来刷磨程度关涉的精准参数,限缩加工时段内的误差.     

滑石粉超细磨过程的机械化学变化

研究了搅拌磨超细粉碎滑石粉过程中粉体表面性质、晶体结构、化学键和元素位移的变化．研究表明,滑石粉经超细磨后,晶体结构趋于无序化,硅、氧和镁原子的结合能降低,各晶面的衍射强度、官能团对应的红外光谱的波峰及衍射斑点也发生波动．用ＸＰＳ,ＸＲＤ,ＴＥＭ和ＩＲ等技术探讨了发生机械化学变化的机理．     

高压辊磨对磁铁矿石磁选特性的影响

对弓长岭磁铁矿石的高压辊磨和颚式破碎产品分别进行阶段磨矿—阶段磁选—细筛再磨试验,分析了两种破碎方式对弓长岭磁铁矿石磨矿特性和磁选特性的影响。结果表明:高压辊磨工艺适宜的一段磨矿细度为-74μm含量占40%,颚式破碎工艺适宜的一段磨矿细度为-74μm含量占50%,两种破碎工艺适宜的二段磨矿细度均为-74μm含量占85%,最佳的细筛筛孔尺寸为50μm,三段磨矿细度为-45μm含量占80%。高压辊磨机碎磨分选工艺与颚式破碎机碎磨分选工艺相比,精矿品位相近,产率高0.52%,回收率高0.92%。     

搅拌磨机械化学改性制备复合粉体的研究

根据搅拌磨超细粉碎的特殊工作原理和高效性，利用搅拌磨的机械化学效应实现超细—改进一体化制备了ＳｉＣ－Ｍ／滑石粉复合粉体，研究了矿浆浓度、改性剂用量对复合粉体粒度及改性剂包覆量的影响．研究结果表明，这种复合粉体粒度分布均匀、工艺简单、活性好、性能稳定．复合粉体填充ＰＰ的制品性能比单纯Ｍ／滑石粉填充ＰＰ的更好．４０％复合粉体填充ＰＰ制备的材料成功地应用于汽车零部件，性能指标达到上海大众汽车公司的标准，应用效果十分显著．     

潜油电泵偏磨失效机理分析

针对潜油电泵存在偏磨的现象,详细分析了潜油电泵偏磨的失效形态和失效原因.重点讨论了振动对潜油电泵偏磨的影响,指出多级泵的振动是产生偏磨的最主要原因.在此基础上,提出了相应的解决方法.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-