Study on Oxygen Isotope Fractionation in RE Oxide Minerals

ＳｔｕｄｙｏｎＯｘｙｇｅｎＩｓｏｔｏｐｅＦｒａｃｔｉｏｎａｔｉｏｎｉｎＲＥＯｘｉｄｅＭｉｎｅｒａｌｓＦａｎｇＴａｏ（方涛），ＱｉｕＹｕｚｈｕｏ（裘愉卓）（ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｃｈｅｍｉｓｔｒｙ，ＡｃａｄｅｍｉａＳｉｎｉｃａ，Ｇｕｉｙａｎｇ５...     

真空钙热还原炉渣的综合利用研究

研究了从真空钙热还原炉渣中回收稀土的工艺条件；采用本工艺得到的合格稀土溶液，其回收率达65．41％；副产品氟化钙用作炼硅铁合金的助熔剂，使钙热还原炉渣得到综合利用。     

RE／S值对控轧低碳Mn－Nb－RE钢硫化物成分和形貌的影响

用扫描电镜测定了含０．０４１％～０．０７６％ＲＥ的低碳Ｍｎ－Ｎｂ－ＲＥ钢中硫化物的成分、大小和形貌。ＲＥ／Ｓ值为２．８～３．０时，钢中的硫化物充分变质。     

HRB400月牙型螺纹钢筋试制

本文详细介绍了包钢采用平炉冶炼工艺试制HRB400钢筋的生产过程和检验结果，对试制中出现的问题提出了改进措施，并初步研究了稀土对HRB400钢筋质量与性能的影响。结果表明，采用平炉冶炼工艺可生产出符合GBl499—1988的HRB400钢筋。本次试验研究尚未看出稀土对HRB400钢筋的质量与性能产生明显影响。     

2RE69/Zr702双金属管氨汽提塔关键部件的设计与制造

介绍了2RE69／Zr702双金属管的特殊结构、优良耐蚀性能，与管板的连接接头型式及焊接工艺、管头及液体分布器加工、装配和试验。     

连铸稀土加入工艺试验

对多流大方坯连铸机生产稀土钢的稀土加入工艺进行了试验,分析了钢包、中间包、结晶器喂稀土丝的优缺点,并进行了对比。根据包钢大方坯连铸工艺的特点和实际情况,选出了大方坯连铸稀土钢的稀土加入工艺。     

Influence of Rare-earth Elements on Mechanical Properties of Palladium

The influence of 0.1-0.6 at.-%RE additions (RE= La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Er, Yb) on themechanical properties of Pd was studied. All above RE additions increased not only the strengthproperties at ambient temperature but also the tensile strength, creep rupture time and activation en-ergy at high temperatures, simultaneously increased the elongation of Pd. In the range of dilute con-centration, the strength properties of Pd-RE alloy enhanced linearly with RE concentration. Whenthe strength properties of Pd-RE alloys were normalized at 0.1 at.-%RE, it was found that light REelements had stronger effect on the properties of Pd than heavy RE, whereas Eu, Yb, Ce had anoma-lous effect. In all Pd-RF alloys, Pd-Eu alloy had the highest strength properties, successively Pd-Yband Pd-Ce alloy. The effect mechanisms of RE in alloy, such as purifying impurities, increasingrecrystallization temperature, refining grain size. expanding crystal lattice, increasing dislocation den-sity and decreasing stacking fault energy, forming stable RE oxidation by internal oxidation, and soon, were observed. They were strengthening sensitive factors. The influence of the factors onstrength properties and elongation of Pd was discussed.     

对提高独居石处理车间稀土回收率的研究

分析了独居石处理过程中影响稀土回收率的种种因素，提出了提高稀土回收率、增加企业经济效益的措施和手段。     

DISTRIBUTION AND EFFECT OF Ce IN RE BEARING DUCTILE IRON

The dependence of nodularization of graphite upon Ce content in RE bearing nodular castiron,prepared by directional solidification,has been investigated by electrolyticextraction-radioisotope assay analysis of Ce in each phase of the iron together withmeasurement of nodulized graphite.Results show that the Ce occurs mainly as alloyed form.In the graphite phase,the Ce content is believed to be characterization of nodularization.Thegraphite would completely nodulized only the Ce is over a certain content in graphite phase.     

稀土在铜及其合金缓蚀剂中的研究

通过失重悬挂法和中性盐雾等腐蚀试验，研究了多种添加剂对铜及其合金的缓蚀作用，结果表明：在BTA溶液中加入一定量的有机羧酸和和稀土RE（IV）盐后，由于三者的协同效应，显著提高了钝化膜的性能。