Title:
Immobilization of Technetium in Blast Furnace Slag Grouts
Author(s):
R. D. Spence, W. D. Bostick. E. W. McDaniel, T. M. Gilliam, J. L. Shoemaker, O. K. Tallent, I. L. Morgan, B. S. Evans-Brown, and K. E. Dodson
Publication:
Symposium Paper
Volume:
114
Issue:
Appears on pages(s):
1579-1596
Keywords:
blast furnace slag; diffusivity; grout; leaching; technitium; nitrate minerals; waste treatment; Materials Research
DOI:
10.14359/1913
Date:
5/1/1989
Abstract:
Blast furnace slags have been successfully used to reduce the leachability of technetium from cement-based waste forms because the slag produces a less permeable product or reduces the pertechnetate to a less mobile form. Waste contaminated with technetium is of particular concern to the U.S. Nuclear Regulatory Commission, Department of Energy, and Environmental Protection Agency because of its mobility as the pertechnetate ion. Results on the technetium leachability of cement-based waste forms with and without a slag component and for different slags are presented. The mass transfer parameter (e.g., diffusivity) for leaching technetium from these waste forms decreased by five orders of magnitude when slag was used (i.e., using slag can increase the ANS 16.1 leachability index by five). Results of bulk and surface examinations of the slags are presented.