A Study on the Phase Transition of WO3-xwith High Activity in H2-Reduction

ZOU Zhi-qiang;WANG Xiao;QIAN Chong-liang

Rare Metals and Cemented Carbides | Vol., Issue 1, 1995 | pp. 1-5

By means of an in-situ high temperature X-ray diffractiontechnics, the phase transition process and the transition kinetics ofWO3-x with high activity during H2-reduction has been studied, theformation mechanism of superfine W-powder d'uring the reduction wasdisonssed.

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Discussion on Recovery of Tellurium

XIAO Jin-e;CHE Wen-ting

Rare Metals and Cemented Carbides | Vol., Issue 1, 1995 | pp. 6-9

The processes of recovering tellurium from copper & leadanode slimes and Bi bullion are describe6. The main factors affectingthe recovery are analyzed and their improvements in variou s tages areintroduced.

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Combined Determination of Cobalt and Nickel inCemented Carbide by EDTA Direct Titration

LI Xi-chun

Rare Metals and Cemented Carbides | Vol., Issue 1, 1995 | pp. 9-11

This paper describes the combined determination of Co-Niin ammoniac ined'ium using M X as indicator and EDTA as titratant.Its Ni can be determine6 by EDTA titration from another part of samesample Co of which is covered' first with (NH4)2S2O8. This method hasbeen used for the determination of Co, and Ni in cementeds carbi ewith satisfactory results.

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Analysis of Al_2O_3 Additive for Doped Tungsten Powders

GUO Xiu-shuang

Rare Metals and Cemented Carbides | Vol., Issue 1, 1995 | pp. 12-13

The content of Al2O3 additive is accurately and rapidlydetermined by volumetric analysis-complex titration, the problem oflong analysis period by gravimetric analysis is solved. By comparison,the said method was proved to be accurate, reliable, simple, feasible andeffective for production. The determination limit ranges from 25 to100g/L the error is about 0.5g/L, and the analysis period is within 30minutes.

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浸出过程的理论基础及实践

LI Hong-gui

Rare Metals and Cemented Carbides | Vol., Issue 1, 1995 | pp. 14-19

浸出过程的理论基础及实践李洪桂（中南工业大学长沙４１００８３）第六讲浸出过程在有色冶金中的应用（续）（３）针铁矿法根据１００℃下Ｆｅ２Ｏ３－Ｈ２Ｏ系的平衡图．在Ｆｅ３＋浓度很稀的条件下，Ｆｅ’“将形成针铁矿ａ—ＦｅＯＯＨ沉淀。针铁矿为一种很稳定的晶体...

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The Application of New Extractant Cyanex 272 toSolvent Extraction of Rare Earths

ZHANG Rui-hua;HU Rong-hua;NIE Da

Rare Metals and Cemented Carbides | Vol., Issue 1, 1995 | pp. 19-24

The prospect of rare earths separation with a new extractantCyanex 272 was predicted by comparison of Cyanex 272 with P204 andP507. The recent study of solvent extraction for rare earths separationby Cyanex 272 has been reviewed. Some suggestions for the study arepresen ted.

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Preparation of Crystalline Rare Earth Carbonate andTheir Application for RE Extraction

LIU Song;MA Rong-jun;LI Xian-bai

Rare Metals and Cemented Carbides | Vol., Issue 1, 1995 | pp. 24-27

This paper reviews several methods for the preparation ofcrys talline tare earth carbonates, and describes their applica non forrare earth extraction.

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Development of the Fine Chemicals ContainingRare Metals(Ⅰ)──Catalyst and Pigment

ZHANG Wen-pu

Rare Metals and Cemented Carbides | Vol., Issue 1, 1995 | pp. 28-34

This artide describes the study and development of catalyst& pigment con taming rare metal elements.

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Application and Development of Beryllium Helped by Isostatic Pressing Technology

SUN Ben-shuang;SONG Xing-hai

Rare Metals and Cemented Carbides | Vol., Issue 1, 1995 | pp. 34-39

The paper has reviewed the help of isostatic pressing technology for Be application and some isostatic pressing processes in beryllium manufacturing, and predicted it's development.

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Carbon Control and its Removal from K2TaF7

LI Ji-hua

Rare Metals and Cemented Carbides | Vol., Issue 1, 1995 | pp. 40-41

The influence of carbon on metallurgical Tapowder is brieflydescribed. The reason for necessity of carbon control in K2TaF7 and itsremoval methods during hydrometallurgy of Ta and Ni are presented.

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