Recent Development of Mining Hard Alloys With Ni Substitute for Co

LIU Rong-xiang;YI Kai-hua

Rare Metals and Cemented Carbides | Vol., Issue 2, 1994 | pp. 46-49

The development of mining hard} alloys with Ni substitute forCo both at home and abroad is described.'

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A Survey and Tendency of Titanium White industry

QIU Dian-yun;MA Rong-jun

Rare Metals and Cemented Carbides | Vol., Issue 2, 1994 | pp. 50-54

This paper presents a survey of titanium white industry andits new products in the world, and gives a brief description of coating method' for its post--treatment from the point of view of technicalrequirements for titanium white nature. The tendency of titaniumwhite industry is outlined.

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Sulphide Precipitation Method for Sb Elimination from Nb Stripping Aqueous Phase of Ta-Nb Solvent Extraction

ZHANG Yao-hua;CHEN Ji-ming

Rare Metals and Cemented Carbides | Vol., Issue 2, 1994 | pp. 54-57

The paper deals with the theory and' practice of sulphide precipitation for Sb elimination from Nb stripping aqueous phase of TaNb solvent extraction. It has been shown that Nb,O, prod'uced fromthe Sb--eliminated' aqueous phase contains 0. 005qO Sb.

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Use of W--Re Thermocouple in High-temperature Sintering Stove of Mo Metallurgy

GUO Guo-zhou;WEI Qing-shan

Rare Metals and Cemented Carbides | Vol., Issue 2, 1994 | pp. 58-60

The present situation of temperature measurement in high--temperature sintering stove of Mo metallurgy was introduced. The adVantage of W--Re thermocouple over traditional optical pyrometer was discussed. The characteristics of several W--Re thermocouples were presen tedl

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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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