Use of Adsorption Column for Separation of Molybdenum from Sodium Tungstate Solution

HUANG Wei-zhuang;GONG Bai-fan

Rare Metals and Cemented Carbides | Vol., Issue 1, 1994 | pp. 1-4

Experiments and study on the separation of molybdenum from sodium tungstate solution have been carried out.It has been shown that the use of granular active carbon adsorption column for separating molybdenum (preyiously converted into sulphomolybdate in solution) can obtained satisfactory result with less of tungsten.

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Additives for Vanadium Roasting

YI Jian-min;YAN Jian-hui;GAO Di-qun;LIU Kang

Rare Metals and Cemented Carbides | Vol., Issue 1, 1994 | pp. 5-9

Study on additives for vanadium roasting was carried out.It is found that NaC1 Na2CO3 may be used instead of NaC1.In this way,air pollution will be reduced and converting rate of vanadium will be raised.

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Study and Production of High Purity Tantalum Oxide

HU Yi-qing

Rare Metals and Cemented Carbides | Vol., Issue 1, 1994 | pp. 9-13

Experiments and study on the production of high purity Ta2O5 powder by liquid-liquid extraction method have been carried out.It has been shown that qualified high purity Ta2O5.powder can be pro duced with 20% N503+30% see-octylalcohol+50% kerosene-HF-H2SO4 and using preventive measures against crud.

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Trial Production of N-series Cemented Carbides for Drilling Tools

SUN Bao-qi;ZHOU Jian-hua

Rare Metals and Cemented Carbides | Vol., Issue 1, 1994 | pp. 14-18

Production technology, properties of products and application effects of a new type of cemented carbide with Ni-base binder for drilling tools are introduced briefly.Trial production shows that the development of the new type of cemented carbide is more successful.Moreover,relative problems are discussed and improvement direction is presenied.

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Application of High-energy Agitating Ball Mill to Preparation of Ultrafine Boron Carbide Powder

ZHOU Rong-xing;WANG Ling-sen;DENG Ke-qin;YANG Ju-mei

Rare Metals and Cemented Carbides | Vol., Issue 1, 1994 | pp. 18-22

Several types of ball mill for preparation of fine boron Carbide p9owder and their principles are analyzed and compared.It has been shown that the high-energy agitating ball mill is an effective equipment for preparation of ultrafine boron carbide and ceramic powder because of great force,quick grinding and simple operation.

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Cold and Hot Isostatic Pressing of Beryllium

SONG Xing-hai;SUN Ben-shuang

Rare Metals and Cemented Carbides | Vol., Issue 1, 1994 | pp. 22-25

The paper describes cold and hot isostatic pressing(CIP /HIP) processes of beryllium and their use in manufacturing near-net -shape(NNS) beryllium parts

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Study and Trial-production of Spectrum Grade Ferroniobium Base

ZHANG Ji-dun;LI Ji-hua;YUAN Ming-xing;ZHONG Yue-lian

Rare Metals and Cemented Carbides | Vol., Issue 1, 1994 | pp. 25-27

Spectrum grade ferroniobium base can be produced from selected raw materials and proper aluminium with additives at a suitable temperature.Impurity content in the base is below GB 7737-87 standard for ferroniobium.

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Modern Developments in RM & HM─Taken out from 13th Plansee Seminar(Ⅰ)

ZOU Zhi-qiang

Rare Metals and Cemented Carbides | Vol., Issue 1, 1994 | pp. 28-35

Basing on the publications and the information from 13th Plansee Seminar, a survey on global modern R and D in refractory metals (RM) and hard materials(HM) was presented. The general introduction in bilef of the Seminar was submitted at first. and then, the recent developments in RM.HM and coating techniques were reviewed. Some problems were discussed.

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A Review of Scattered Metels(Ⅰ)

ZHOU Ling-zhi;ZOU Jia-yan

Rare Metals and Cemented Carbides | Vol., Issue 1, 1994 | pp. 35-41

This paper is a review of the scattered metals(such as Ga In.T1.Ge.Se.Te and Re),including their geology. reserch. process technology. uses.market,environment and outlook both at home and abroad in recent years.It indicates that the scattered metals have played an important part in the Gulf War and have a great significance in state security.

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Complex Utilization of Tungsten Resources

PAN Ye-jin

Rare Metals and Cemented Carbides | Vol., Issue 1, 1994 | pp. 42-44

The importance of complex utilization of tungsten resources is described.The technology and processes for complex utilization of tungsten resources abroad are introduced and evaluated.

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