Authors:
Dong-Yong Chung Korea Atomic Energy Research Institute P.O. Box 105 305-600 Yusong, Taejon (Korea)

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Eung-Ho Kim Korea Atomic Energy Research Institute P.O. Box 105 305-600 Yusong, Taejon (Korea)

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Young-Joon Shin Korea Atomic Energy Research Institute P.O. Box 105 305-600 Yusong, Taejon (Korea)

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Jae-Hyung Yoo Korea Atomic Energy Research Institute P.O. Box 105 305-600 Yusong, Taejon (Korea)

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Jong-Duk Kim Korea Advanced Institute of Science and Technology Department of Chemical Engineering 373-1 Kusung-Dong 305-701 Yusong, Taejon (Korea)

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Abstract  

The formation of precipitates by hydrazine was experimentally examined in the simulated high level liquid waste (HLLW), which was composed of 9 elements (Nd, Fe, Ni, Mo, Zr, Pd, Ru, Cs, Sr). Palladium was precipitated over 90% above 0.05M of hydrazine concentration and at 2M HNO3, while all of the other elements were hardly precipitated. The elements of Pd and Zr were precipitated 93% and 70% in the simulated solution in which the concentrations of Zr and Mo were decreased from 0.069M to 3.45·10–3M and 6.9·10–3M, respectively, and the acid concentration was decreased to about 0.5M after denitration. In a Pd solution of 0.5M and 2M HNO3, the precipitation yield of Pd increased with hydrazine concentration and reached over 98% at 0.1M. The precipitation yield of Pd at 0.5M HNO3 was higher than at 2M HNO3. The Pd precipitate, formed by adding hydrazine to an acidified solution, was an amorphous compound consisting of Pd, hydrazine, nitrate and hydrate.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)