某铜钼选厂铜精矿浓密溢流磁絮凝试验

为去除某铜钼选矿厂铜精矿浓密溢流水中的悬浮物使其能够回用,对该溢流水进行了磁絮凝试验。试验结果表明：当PAC用量为250 g/t、PAM用量为0.25 g/t、磁粉用量为2 500 g/t时,磁絮凝工艺可使溢流水的悬浮物去除率达到97%,浊度降至4 NTU,而且其效率比传统混凝工艺大大提高。     

提高磁选选择性的研究

筒式磁选机因其结构简单、使用方便可靠、占地小、生产能力大等优点，数十年来被世界各国大量应用于磁铁矿选矿。但是它存在的田选选择性不高，尤其是要求制取超高品位铁精矿时更显得无能为力。本文试图通过干式平移电磁分选装置对磁铁矿选矿所展示的良好选择性以及对试验中观察到的现象进行分梳提出提高磁选选择性的一些看法。     

四川汉源县河西乡老鹰岩铅锌矿地质特征与找矿前景

本文通过对矿区的地质背景,地层、构造、矿体特征及矿石特征等方面进行研究,查明了该矿床的主要控矿因素,包括以下三点:地层、构造及岩浆活动。事实证明,在该研究区内进行的化探找矿方法,效果明显,且均为矿化异常,具有较好的找矿前景。     

Comparative study on the static and dynamic characteristics of four types of PMFCLs for large capacity applications

Permanent-Magnet-Biased Saturation Based Fault Current Limiter (PMFCL) may find early applications in high-voltage and large capacity power systems due to prominent advantages such as compactness, small size, reliable and safe operation, and zero reset time. The prevailing topologies and the operating principles of the PMFCLs are elucidated in the paper. Theoretical analysis on both the static and dynamic characteristics of different modes of PMFCLs is carried out comparatively, in which new concepts of effective magnetic flux density and magnetic field intensity are proposed to describe the overall impacts of the magnetic field on the current limiting capacity of the PMFCLs. Based on theoretical analysis and mathematical deduction, equivalent magnetic circuits and equations are established, which presents invaluable fundamentals for further study on the operating mechanism of different modes of PMFCLs as well as optimization of the fault current limiting topology design.     

稳恒磁场处理对聚乙烯/炭系填料复合材料电导特性的影响

在聚乙烯(PE)、低密度聚乙烯(LDPE)/炭黑、LDPE/石墨、LDPE/碳纳米管的热压成型过程中施加稳恒磁场,研究了磁场处理对聚乙烯/炭系填料复合材料电导特性的影响。研究结果表明:磁场处理能导致聚乙烯的结晶度提高,聚乙烯和LDPE/炭黑复合材料的体积电阻率增加;磁场在石墨片层内和碳纳米管中"诱导"形成感应磁矩,使得石墨片层和碳纳米管分别沿垂直于磁场方向和平行于磁场方向在LDPE中取向,从而导致LDPE/石墨复合材料沿平行于磁场方向的电导率减小,而LDPE/碳纳米管复合材料沿平行于磁场方向的电导率增加。     

三相电动机绕组首末端反接时运行状态分析

通过讨论Y315M2-8电机的一起质量事故,分析三相异步电动机在其中一相绕组首末端反接情况下电机的运行状态。分析着重于电机的转向、三相电流及转速三个方面。     

对大庆老区水平井水淹问题的认识

随着水平井钻井工艺水平的提高及钻井成本的降低,利用水平井技术挖潜厚油层顶部的剩余油已成为改善油田开发效果的途径之一。在对国内外水平井技术现状分析的基础上,提出了大庆老区厚油层水平井水淹问题的几点认识以及今后如何应用水平井技术的初步建议。     

Physicochemical Properties of Nanocrystallite Copper Ferrite Prepared by a Novel Self Flash Combustion of Acetate Precursors

1.IntroductionThe fast developments in science and technologyneed materials with specific properties to satisfy the re-quirements of the area of application.Metallic oxidesare important class of compounds and among them,ferrites are most prominent by virtue of their spinelstructure with high thermodynamic stability,magneticproperties[1~3],and electrical conductivity[4~6]and cat-alytic activity[7~9]in addition to their resistance to cor-rosion and so they are used in telecommunication,per-manen…     

Primary Recrystallization of Grain Oriented Silicon Steel Strip Rolled by CSR and Annealed in Magnetic Field

The magnetic properties and textures of grain oriented silicon steel with different thickness rolled by cross shear rolling (CSR) of different mismatched speed ratio (MSR) and annealed in magnetic field under hydrogen were presented. Effects of the factors such as thickness and mismatched speed ratio on the magnetic properties and recrystallization texture were analyzed and the recrystallization principles in magnetic field annealing were discussed. The study would provide a new route for mass production of high quality ultra-thin grain oriented silicon steel strip.     

Syntheses,Properties, and Potential Applications of Multicomponent Magnetic Nanoparticles

Multicomponent hybrid nanostructures that contain two or more nanometer‐scale components have attracted much attention recently owing to the synergistic properties induced by interactions between these different nanometer‐scale objects. Herein, we give an overview of the efforts to synthesize multicomponent nanoparticles with at least one component being magnetic, and focus on our recent developments. The syntheses are based on heterogeneous nucleation and growth of a second and third component onto seed nanoparticles. These multicomponent nanoparticles show interesting magnetic, magneto‐optical, plasmonic, and semiconducting properties that can be modulated by interfacial interactions between different nanocomponents. This opens up a new avenue to advanced multifunctional nanomaterials for device concepts and applications.