Φ12mm稀土合金包芯线的孔型设计

详述了Φ１２ｍｍ稀土合金包芯线孔型设计原理方法及步骤。依据此设计孔型生产的稀土合金包芯线，符合ＹＢＴ０５３－９３１包芯线标准，通过处理钢水试验冶金效果良好，稀土回收率为３０％，比原来提高约５－１０倍。     

攀钢稀土处理钢生产工艺

开发了用稀土处理钢液的工艺。加稀土前先用碱土金属（Ｃａ，Ｂａ，Ｍｇ）对钢液脱氧、脱硫、然后将含稀土的复合包芯线畏入钢中，以生产合金结构钢、单簧钢。经过上述处理后，再向结晶器喂稀土包芯线畏入钢中就可生产管线钢、汽车大梁板和耐修等优质钢。这些钢的总氧含量（Ｔ．Ｏ）≤２０ｐｐｍ，具有良好的力学性能。     

炼钢喂线技术专用设备——喂线机

近来年,随着钢铁工业的发展,用于钢铁冶金方面的稀土合金、铝及其它合金的用量越来越大,降耗、节能的研究不断推出,如采用真空冶炼,炉后吹氩,电磁搅拌,钢包中压入脱氧、变性添加剂等诸多技术,都不同程度的提高了冶金效果。70年代又应运而生了喂线技术,即在钢包内喂入裸铝线(直径6～13mm)、合金包芯线(芯部材料含一种或     

稀土对高速钢堆焊层组织与性能的影响

本文研究了稀土合金对高速钢Ｗ_（１８）Ｃｒ_４Ｖ堆焊层微观组织，力学性能和耐磨性的影响。结果表明，在焊条药皮中加入适量的稀土合金，在焊态下能使高速钢堆焊金属中的共晶碳化物由连续网状，粗大骨骼状（莱氏体）转变成孤立、细小的不规则块状；冲击韧性提高１５２％，耐磨性提高４７～１０９％。并对稀土所起的作用进行了分析讨论。     

稀土在铝及铝合金中的应用现状与展望

稀土（RE）是十分活泼的金属。稀土元素作为微量元素加入铝合金中，可以净化合金熔体、减少夹杂．细化、变质微观组织；作为合金元素加入适量稀土可显著提高铝合金的综合性能。本文讨论了稀土在铝及铝合金中的作用机理，论述了稀土在铝及铝合金中的开发应用现状．展望了稀土铝合金的发展前景。     

中华人民共和国冶金行业标准——合金包芯线审定会在天津举行

1993年4月22日～25日在天津市蓟县对合金包芯线行业标准进行了审定,审定会由冶金部信息标准研究院主持,冶金部科技司有关负责同志出席了会议并讲了话,会议代表50余人。包芯线是以各种合金粉剂,以一定厚度的冷轧退火钢带或铜带等包覆,经轧拔而成,我国从国外引进此技术后,在炼钢生产中已     

钢包喂线技术在转炉炼钢中的应用

新钢公司第一炼钢厂转炉钢水经过喂Ｃａ－Ｓｉ包芯线和吹Ａｒ处理，取得了脱氧，脱硫，改善钢液流动性的良好效果，成材（坯）率显著提高，钢材力学性能有所改善。     

Al—Si合金中稀土变质潜伏期的研究

本文用测定Al－Si合金变质度（△b）、机械性能（σb，δ）及金相组织的方法，来判断不同工艺条件下，稀土变质潜伏期的长短，讨论影响潜伏期的因素。试验表明，在金用模冷却条件下，Al-Si出共晶合金用稀土变质处理，具有1～2小时潜伏期。保温湿度升高，潜伏期明显缩短。因此，变质潜伏期长短与变质元素稀土在铝液中扩散速度有关，凡有利于稀土在铝液中均匀扩散的因素，都有利于变质潜伏期的缩短及变质作用的充分发挥。     

稀土在铅黄铜合金中的应用

工频感应炉中熔炼添加微量稀土元素的HPb59-1铅黄铜合金,采用水平连铸,拉制φ12mm的合金线坯,然后拉拔得到φ6mm的线材。试验结果表明,加入微量稀土,可使合金的晶粒细化,从而改善工艺性能,减少了加工过程中裂纹、断条现象,成品率可提高6％以上,并使线材的抗拉强度和延伸率得到一定提高。合金中稀土的最佳加入量为0.04％～0.05％（wt）。本研究结果为稀土在HPb59-1铅黄铜中的工业应用提供了可靠的依据。     

我国独具特色的稀土电工铝和铝稀土合金

中国稀土铝导体和铝稀土合金研究，开发和应用过程概况，稀土导电铝和稀土铝合金的特性；铝稀土合金应用领域逐步扩大，稀土消费量迅速增加；制取铝稀土合金系列的新思想和新工艺过程；稀土添加剂在铝和铝合金中的作用；某些值得注意的问题。     

H13模具钢表面处理和热疲-热熔损性能

对H13钢进行了硫氮碳（SNC）共渗加氢化处理、稀土（RE）-SNC共渗及稀土（RE）－SNC共渗加氧化处理等表面处理工艺试验；并对处理试样分别进行了热疲劳性能和在合金铝液中的热熔损性能试验；结果表明，在空气氧化条件下，添加稀土的SNC共渗加氧化复合处理试验的渗层热疲劳性能比未添加稀土（RE）的SNC共渗加氧化复合处理及随后未经氧化处理的RE-SNC共渗的试样高；在本试验条件下，加稀土进行处理的试样比未加稀土进行处理的试样，在铝液中的热熔损性能略偏低。     

Hydrogen Fixation Effect of Rare Earths in Pure Aluminium and Aluminium Alloys

The areal distribution of some elements in the rare earth bearing spheroidal phases in pure aluminium andAl-Mn alloys was studied by SIMS(secondary ion mass spectrometry).The results show that cerium,iron.silicon and hydrogen are significantly segregated in the phases.Thus the existence of hydrogen-rich rare earthbearing eompounds is confirmed.It indicates that the rare earths have a hydrogen fixation effect in aluminiumand aluminium alloys.     

Synthesis,crystal structures of novel complexes of rare earth with norfloxacin,interaction with DNA and BSA

Three novel rare earth complexes [N(CH 3) 4 ][Ln(NF) 4 ]·6H 2 O(Ln=Nd(III)(1),Sm(III)(2),Ho(III)(3)) were synthesized using hydrothermal method from norfloxacin HNF=1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinoline carboxylic acid,C 16 H 18 FN 3 O 3),imidazole and rare earth nitrates.The complexes were characterized by elemental analysis,FT-IR,TG-DTG and X-ray single crystal diffraction.Each rare earth ion was eight-coordinated with carboxyl-O atoms and keto-O atoms from norfloxacin.Four of the norfloxacin ions acted as bidentate chelate group took part in the coordination with rare earth ion.The structures of complexes were tetragonal system with space group I4 1 /acd,which were allomerism.The interaction between complex 1 and DNA was studied by electronic absorption spectra and fluorescence spectroscopy.The binding interaction between the complex 1 and bovine serum albumin(BSA) was studied by fluorescence spectroscopy.The complex 1 bound to DNA by the mode of partial intercalation.Complex 1 had a strong ability to quench the fluorescence from BSA.The complex interaction was mainly a static quenching process with BSA together with formation of two binding sites.     

The Rare Earth Aluminium Alloys in China

The development and application of rare earth aluminium alloys began in the 1960s in China.The represen-tative work was the usage of rare earth metals in alumino-silicon alloys for piston.In the 1970s,its initial stage.rare earths were used in enhanced AIMgSi alloy transmission line and FeCr Al alloy electric heating wire.Duringits developing period(from 1980 to 1985),in the field of smelting,after the electrolytic preparation of RE-Almaster alloys at relatively low temperature,a new technique was invented that rare earth compounds were addedto commercial aluminium electrowinning cell to produce RE-Al alloys directly.It opened the way for the appli-cation of rare earths in industry on a large scale.In the field of application,it was found that the addition ofrare earths could improve the conductivity and processing property of aluminium alloys.The application of rareearths to aluminium conductors and products had made a breakthrough progress.Since 1986,its golden age,thestudy,production and application of aluminium alloys containing rare earths have been developing at an amazingspeed,running neck and neck with the application of RE in agriculture,textile dyeing,and cast iron.     

Extraction and separation of yttrium from other rare earths in chloride medium by phosphorylcarboxylic acids

Two phosphorylcarboxylic acids, 3-((bis(2-ethylhexyloxy))phosphoryl)propanoic acid (PPA) and 3-((bis(2-ethylhexyloxy))phosphoryl)-3-phenylpropanoic acid (PPPA), were synthesized for separating yttrium from other rare earths in the chloride feed of ion-adsorption type rare earth concentrate. The effect of the factors such as pH_1/2, temperature, saponification degree and phase modifiers was investigated. The separation efficiencies of PPA and PPPA are obviously better than the typical extractants such as sec-octylphenoxy acetic acid (CA-12) and naphthenic acid (NA). The extraction process of rare earths by PPA and PPPA is a cation exchanging reaction, which is similar to those of CA-12 and NA. The loaded rare earths in both PPA and PPPA systems can be effectively back-extracted by 0.5 mol/L HCl or higher concentration. A cascade extraction process for separating yttrium from other rare earths was developed using PPPA as the extractant. The yttrium product with the purity of 97.20 wt% was obtained by 35 stages of extraction and 12 stages of scrubbing.     

锌与稀土分离及碱式碳酸锌的制备

在稀土湿法冶金生产工艺中实现了锌与稀土的萃取分离,制备出优于国标的碱式碳酸锌产品,对该产品进行了X射线衍射分析和经过原子吸收光谱对产品进行碳含量的分析,确定合成的碱式碳酸锌主要是以Zn5(CO3)2(OH)6形式存在。     

中国稀土行业存在“资源诅咒”吗?——基于企业层面和城市层面的分析

基于Wind数据库及《中国城市统计年鉴》数据,分别从企业层面和城市层面对我国稀土行业是否存在“资源诅咒”现象进行实证检验。结果表明:企业层面,我国稀土行业存在“资源诅咒”,原因是稀土企业存在“短视”行为,低质量地盲目扩张阻碍了TFP增长,研发投入低及未发挥负债积极的财务杠杆作用。拥有采矿权的稀土企业“资源诅咒”更加严重;城市层面也存在资源的“诅咒”,传导机制基于城市层面存在明显的“挤出”效应,主要体现在对社会固定资产投资、人力资本、技术创新和外商投资的挤出,同时还弱化了城市的制度环境。      

稀土铝合金的研究进展

在铝合金中加入稀土元素,可以细化组织,显著提高铝合金的性能,本文阐述了稀土对铝合金组织和性能的影响,为实际应用提供参考。     

环烷酸萃取体系中单一稀土和铝的分配比及分离系数的研究

对不同萃取剂皂化值、料液酸度和铝浓度条件下,单一稀土和铝在环烷酸体系中的分配比和分离系数进行研究,结构表明料液的酸度较高时,皂化值为0.35 M环烷酸体系可以获得铝和稀土相对更高的分离系数及更好的分离效果。铝离子浓度较低时,料液酸度较高的条件下仍可实现稀土和铝的较好分离,而铝离子浓度较高时(150 mmol/L),料液酸度较高不利于稀土和铝的分离。     

稀土在铝及铝合金中的作用

依据文献综合介绍了稀土对铝及铝合金的力学性能、热学性能、光学性能、电学性能、耐腐蚀性能和工艺性能的影响,探讨了稀土在铝及铝合金中净化、变质和合金化作用的微观机理,讨论了稀土铝合金发展中存在的问题。