Synthesis and Luminescent Properties of CaTiO3Pr3+

ZHANG Hua-jing;LIAN Shi-xun;WU Zhen-guo;LI Cheng-zhi;MAO Xiang-hui;MA Ming;LIU Lian-ying

Rare Metals and Cemented Carbides | Vol., Issue 2, 1999 | pp. 38-39

The method of synthesising CaTiO3 doped with rare earth ions Pr3+ was reported in this paper. The emission peaking at 613nm is corresponding to the spectral tranision1D23H4 of Pr3+ inos. The dependence of luminescent properties of CaTiO3Pr3+ on different synthesis condition was investigated.

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Recovery of Nd2O3 from NdFeB Scraps

SU Hua

Rare Metals and Cemented Carbides | Vol., Issue 2, 1999 | pp. 40-42

The technological process for Nd2O3 recovery from NdFeB scraps is studied. Practice shows that the purity of rare earths is high(Nd2O399%,Dy2O399%) and the nonRE impurities are little(SiO2;CaO;Fe2O30.05%) in the products. The products can be used in production of metal Nd from which NdFeB is made. The process has advantages of a few processes, simple operation, little pollution, low cost, high recovery and so on.

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Method for Reducting NonRE Impurities in Pure Tb

WU Jian-she;CHEN Hai-quan;ZUO Jian-xin

Rare Metals and Cemented Carbides | Vol., Issue 2, 1999 | pp. 43-45

NonRE impurities in pure Tb obtained by tradition process are high. Additional steps have been taken to reduce the impurities. Experiment results are satisfactory

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Improvement on Sintering of Jiangxi Limica and Limestone

LIN Gao-kui

Rare Metals and Cemented Carbides | Vol., Issue 2, 1999 | pp. 46-48

For Li recovery,study was made on sintering of Limica, limestone and lime, with addition of LiOH mother liquor. Preliminary result: sintering temperature 750-850 , Li2O leaching rate about 91%. Compared with original sintering of Limica and limestone, sintering temperature has been decreased by about 150,Li2O leaching rate has been increased by about 11%.

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Preparation and Applications of NanostructuredWCCo composite Powders

GAO Rong-gen

Rare Metals and Cemented Carbides | Vol., Issue 2, 1999 | pp. 49-54

This paper introduce a process of preparating nanostructured WCCo composite powders-thermochemical synthesis. The process involves preparation of starting solutions, spray drying to form chemically homogeneous precursor powders and fluid bed thermochemical conversion of the precursor powders into the nanostructured WCCo composite powders. The structures,properties and applications of prepared nanostructured WCCo composite powders are descrebed.

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WContaining Contact MaterialsTechnologies,Types and Applications

CHEN Qi-ming

Rare Metals and Cemented Carbides | Vol., Issue 2, 1999 | pp. 55-57

The basic types, technologies and applications of Wcontaining contact materials, and their improvements are presented.

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Ask Management for Returns

WANG Mei

Rare Metals and Cemented Carbides | Vol., Issue 2, 1999 | pp. 58-60

The relationship between the management and the returns is presented. Correct decisions are the core of asking management for good returns, as well as are the premise for fully development of productive force. Construction of a management information system is an effective way for improving management.

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Preparation and Application of New Extractant Cyanex 272

TIAN Jun;YIN Jing-qun;OU Yang-ke-xian

Rare Metals and Cemented Carbides | Vol., Issue 2, 1999 | pp. 61-63

The preparation of newextractant Cyanex 272 and its application in solvent extraction are reviewed.

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Investigation on Preparation of Coarse Crystal W Powder through Li activated H 2 Reduction of WO 3

SUN Bao-qi;CHEN Yi-ming

Rare Metals and Cemented Carbides | Vol., Issue 1, 1999 | pp. 1-6

Li activated H 2 reduction of WO 3 is carried out in four steps. During reduction of WO 3 with 200×10 -6 lithia at 900-950℃, the reduction duration can decrease by ～20%,The activation is greatly shown in the step of WO 2 W. The coarsening of W powder size and the effect of Li addition are clearly indicated in the step of WO 2.72 -WO 2,particularly in the step of WO 2-W. The mechanism of activation and grain coarsening during reduction is discussed.

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Study of Preparation of WCl 6

OU Yang-ya-fei

Rare Metals and Cemented Carbides | Vol., Issue 1, 1999 | pp. 7-10

Study is made of the preparation of WCl 6 by gas solid phase reaction.The reactor type, material morphology (W powder or briquette), furnace atmosphere, product quality, chloridization reaction velocity and the rectification of WCl 6 are investigated. Using the experiment results, the chloridization reaction velocity can accelarate, and the WCl 6 powder can be obtained with low oxygen(<0.5%).

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