磁性材料用超纯铁精矿生产工艺研究

介绍了磁选方法预处理原料,制备适合于永磁铁氧体生产的合格超纯铁精矿。试验研究表明,在磨矿细度９８％－３７μｍ、磁场强度０．１Ｔ、分散剂用量３ｍｇ／Ｌ、有机高分子用量ω＝４×１０－６的最佳工艺条件下,生产出ＴＦｅ７１．８％、ＳｉＯ２＜０５％的超纯铁精矿;生产出合格的铁氧体永磁材料,其指标：Ｂｒ＝０．２１０５Ｔ,Ｈｃ＝１２９．８ｋＡ／ｍ,（Ｂ·Ｈ）ｍａｘ＝７．２ｋＪ／ｍ３。     

用磁铁矿精矿制取锶铁氧体工艺研究

介绍了依据磁铁矿精矿自身特点,采用新型添加剂Ｂ和Ｌ改善磁性能,生产出合格的铁氧体永磁材料。其磁性能指标：Ｂｒ ＝０ ．２１３ Ｔ, Ｈｃ ＝ １２９．８ ｋＡ／ｍ ,（Ｂ·Ｈ）ｍａｘ ＝ ７．２ ｋＪ／ｍ３ 。     

HDDR处理过程中Nd—Fe—B永磁合金的相变和富钕相的行为

本研究为Ｎｄ－Ｆｅ－Ｂ合金在ＨＤＤＲ处理过程中其相和显微组织的变化以及富钕相在变化中的扩散行为提供了确凿的证据和补充。对于高Ｎｄ含量的Ｎｄ－Ｆｅ－Ｂ合金,处理过程中Ｎｄ与Ｆｅ的相互扩散是ＨＤＤＲ法处理的Ｎｄ－Ｆｅ－Ｂ粉末成分变得均匀、磁性能得以改善的基本原因．     

HDDR处理过程中Nd－Fe－B永磁合金的相变和富钕相的行为

本研究为Ｎｄ－Ｆｅ－Ｂ合金在ＨＤＤＲ处理过程中其相和显微组织的变化以及富钕相在变化中的扩散行为提供了确凿的证据和补充。对于高Ｎｄ含量的Ｎｄ－Ｆｅ－Ｂ合金,处理过程中Ｎｄ与Ｆｅ的相互扩散是ＨＤＤＲ法处理的Ｎｄ－Ｆｅ－Ｂ粉末成分变得均匀、磁性能得以改善的基本原因．     

KF－AlF_3系热力学性质的计算

在ＫＦ－ＡｌＦ３熔体中采用络合离子逐级分解的模式，利用亚晶格溶液模型计算了ＫＦ－ＡｌＦ３熔体中的逐级解离常数和分解能。分解常数依次为ｋ１＝１．５５×１０－１，ｌ２＝４．２０×１０－２，ｋ３＝７．０１×１０－３；分解热依次为Ｈ１＝３７．８ｋＪ／ｍｏｌ，Ｈ２＝４８．２ｋＪ／ｍｏｌ，Ｈ３＝１２２．ｌｋＪ／ｍｏｌ，计算结果表明ＫＦ－ＡｌＦ３熔体中时比ＮａＦ－ＡｌＦ３和ＬｉＦ－ＡｌＦ３熔体中的都更稳定。本文还对ＫＦ－ＡｌＦ３熔体中各组成的摩尔浓度及其它混合热力学性质进行了计算，计算结果与实验测得结果吻合的较好。     

关于Fourier—Laplace级数绝对收敛性的注记

讨论了ｎ－维球面上某些可微函数类的Ｆｏｕｒｉｅｒ－Ｌａｐｌａｃｅ级数的绝对收敛性，其中指出：设计ｆ是Ｈ＾ｒｐ（Ω）上２（「ｎ／４）＋１）次连续可微函数，则级数∑∞ｋ＝０Ｙｋｆ（ｎ）一致收敛到ｆ。参５。     

CVD动态沉积法连续制备YBCO超导带

本文报道了用ＣＶＤ动态沉积法连续制备ＹＢＣＯ起导带的实验结果。以Ｙ（ＴＭＨＤ）３，Ｂａ（ＴＭＨＤ）２，Ｃｕ（ＴＭＨＤ）２为挥发源，高纯Ａｒ和Ｏ２分别为载流和反应气体，在移动的金属Ａｇ基带上，以１０－１５ｃｍ／ｈ的带速制出了有强烈Ｃ－轴取向的ＹＢＣＯ超导带。最好样品的Ｊｃ达到１．４×１０＾４Ａ／ｃｍ＾２（７８Ｋ，ＯＴ）。     

镉与DBON—PF显色反应的研究及应用

研究了镉与ＤＢＯＮ－ＰＦ显色反应的条件,在ＰＨ９的硼砂－硼酸缓冲溶液中,有ＣＴＭＡＢ存在下,镉与ＤＢＯＮ－ＰＦ形成蓝紫色合物物,最大吸收波长为６１０ｎｍ,表观摩尔吸光系数为２．６４×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１,络合物的配合比为Ｃｄ（Ⅱ）ＤＢＯＮ－ＰＦ;ＣＴＭＡＢ＝１：１：２,镉量在０～０．１６μｇ／ｍＬ符合比耳定律。通过收基棉柱富集、分离,除去大量的干扰离子,本法灵敏度高,稳定时间长,能     

一种永磁磁路设计的新方法

本文从永磁磁路设计的基本公式出发，从理论上讨论了永磁体的一个计算公式μ０Ｈｇ＾２＝１／ｋｆｋｒ（－ＨｍＢｍ）Ｖｍ／Ｖｇ，可以表示为μ０Ｈｇ＾２＝１／ｋ（ＢＨ）ｍＶｍ／Ｖｇ，若用已知性能的磁性材料做成一定形状磁体，测量其几何参数及Ｈｇ，即可按上式求出ｋ，然后把ｋ值作为此种形状磁体的校正系数，就可以方便地求出用其它磁性材料设计这种磁体所需材料的最小体积。这样为使用新磁性材料设计磁路提供了一个简捷的方法     

硅钛交联膨润土对COD的吸附研究

作者比较了不同交联膨润土对ＣＯＤ的吸附，结果表明：ＳＴＢ－０１吸附剂（硅钛交联膨润土）对ＣＯＤ表现出较好的吸附性能。当吸附时间为３０ｍｉｎ、废水ｐＨ为５．０、ＳＴＢ－０１用量为１５ｇ·ＬＨ２Ｏ＾－１时，其吸附容量为４９．７ｍｇ·ＣＯＤ·ｇ＾－１（ＳＴＢ）。其吸附热力学模型为ＬｎＤ＝ΔＨ／ＲＴ＋２．３０３·ΔＳ／Ｒ＝２８８６，７０·Ｔ＾－１－１０．４１。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

2014 second batch of rare earth quota released

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矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586