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Co Recovery from Co Slag Arising from Scrap Hard Metal Smelting with Na_2SO_4

JIANG Wen-wei;GAO Jin;PU Chong-en;XIE Sheng-de

Rare Metals and Cemented Carbides | Vol., Issue 2, 2000 | pp. 22-25

The Co slag obtained from scrap hard metal smelting with Na 2SO 4 was analysed by XRD. Results show that the Co in the slag is in the form of Co 9S 8. Analysis of Co 9S 8 by phase diagram shows its formation mechanism, and oxiding roasting method for the Co slag treatment was put forward. Results show that after oxiding roasting of the Co slag,the leaching rate of Co is more than 99%.

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Preparation of Metallographic Samples and Structure Analysis of RE Alloys

XU Guo-fu

Rare Metals and Cemented Carbides | Vol., Issue 2, 2000 | pp. 26-29

By taking La Co Ni triangle system and Nd Cu,Gd Cu binary system for examples,the steps and principles of preparing metallographic samples of rare earth alloys are introduced.The metallographic photoes of 5La 73Co 22Ni,6La 89Co 6Ni,25.6La 34Co 40 4Ni,Nd 69Cu,Gd 12Cu are given with structure analysis.

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Production Design of Foamed Ni and Product's Quality Improvement

HE Xing-min;HE Ju-xiang

Rare Metals and Cemented Carbides | Vol., Issue 2, 2000 | pp. 30-33

The paper describes the production design of foamed Ni,with discussion for product's quality improvement.

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A Wet process for Extracting As_2O_3 from As-containing Material:Design Consideration and Production

DAI Xue-yu

Rare Metals and Cemented Carbides | Vol., Issue 2, 2000 | pp. 34-36

This paper introduces the wet process for extracting As 2O 3 from As containing material.It improves the quality of product and reduces the air pollution in comparison with fire method.

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A New Approach to High-effective Use of Coal Gangue

CAI Jin-qiang

Rare Metals and Cemented Carbides | Vol., Issue 2, 2000 | pp. 37-38

The paper reviews the comprehensive use of coal gangue in detail.Author highly appraises the new process for preparation of high early(strength) cement from coal gangue (researchers:Xie Zha ji,et al) as a effective method for use of coal gangue, and recommends that the researchers shall transfer the research results into production force as early as possible.

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About the Way to Solving the Operation Problems Facing Hard Metal Works

YIN Xiang-chu

Rare Metals and Cemented Carbides | Vol., Issue 2, 2000 | pp. 39-42

In light of the operation problems facing small and medium sized state owned hard metal works, author puts forward some countermeasure to inerease enterprise's profit:turn around operation way, improve management and rely on science and technology to develop new products,etc.

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