Hostname: page-component-54dcc4c588-smtgx Total loading time: 0 Render date: 2025-10-13T10:29:17.516Z Has data issue: false hasContentIssue false
  • English
  • Français

Immobilization of Actinides by Hydroxylapatite

Published online by Cambridge University Press:  25 February 2011

R. Gauglitz ,
M. Holterdorf ,
W. Franke  and
G. Marx
R. Gauglitz
Affiliation:
Free University of Berlin, Institute of Inorganic and Analytical Chemistry, Radiochimical Division, Fabeckstr.34-36, 1000 Berlin 33, FRG
Get access

Abstract

In cooperation with the Ministry of Research and Technology we investigated the influence of hydroxylapatite (HAP) added to the backfill material of a radioactive waste disposal located in a salt dome. The time dependence of the sorption and precipitation of radionuclides has been studied in three different praxisrelevant salt brines under variation of temperature and pH-value.

Performing batch experiments uranium and thorium phosphates were precipitated from UO 2(NO 3)2 and Th(NO 3)4 solutions at 75°C, the amounts of the relevant actinide compounds also exceeding that of HAP. The isolated precipitates were investigated by use of X-ray-powder-diffractometry and SEM. For the various uranium systems two mineral phases were obtained. From solution II and also from Q-brine the mineral saléeite Mg(UO 2)2 (PO 4)2 · 9 H 2 O was formed. From solution III meta-autunite Ca(UO 2)2(PO 4)2 · 6 H 2 O, a dehydration product of autunite, was precipitated.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 257: Symposium – Scientific Basis for Nuclear Waste Management XV , 1991 , 567
Copyright
Copyright © Materials Research Society 1992

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

REFERENCES

[1] ROXBURGH, I.S.: Geology of High Level Waste Disposal, Chapman and Hall - New York 1987.Google Scholar
[2] RINGWOOD, A.E.: Fortschr. Miner.,58(2)(1980) 149–168.Google Scholar
[3] GUNTER, H. A.: Fortschr. Miner., 58(2)(1980) 169–211.Google Scholar
[4] NOWAK, E.J.: SAND 79–1110 (1980).CrossRefGoogle Scholar
[5] NOWAK, E.J.: SAND 79–0990 (1979).Google Scholar
[6] NOWAK, E.J.: SAND 82–0750 (1982).CrossRefGoogle Scholar
[7] RIESENFELD, E.H.: Anorganisch-chemisches Praktikum, Verlag S.Hirzel - Leipzig 1931.Google Scholar
[8] BRAITSCH, O.: Entstehung und Stoffbestand der Salzlagerstitten, Springer Verlag - Berlin 1962, 86ff.Google Scholar
[9] Arbeitskreis “HAW-Produkte” des BMFT: Stellungnahme Nr. 3 - Korrosionsexperimente an verglasten radioaktiven Abfilen - Salzlösungen und S/V-Verhi1tnis (1986), 2-11.Google Scholar