Immobilization of radioactive corrosion products by cold sintering of pure hydroxyapatite

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An efficient method for the consolidation of cobalt (Co(II)) adsorbed calcium hydroxyapatite was investigated to develop a simplified route for decontamination of the coolant system of nuclear power plants and direct immobilization of as-spent adsorbent. Calcium hydroxyapatite nano-powder synthesized by a wet precipitation method was used as an adsorbent and 94% Co(II) surrogate removal from simulated water was measured. The as-spent adsorbent was sintered at 200 degrees C, a temperature significantly lower than conventional sintering temperatures (900-1300 degrees C) for hydroxyapatite, under a uniaxial pressure of 500 MPa for 10 min. The relative density after the cold sintering was > 97% and sintered samples displayed good compressive strength (175 MPa). The normalized leaching rate of the Co(II) was measured as per ASTM-C1285 standard and found to be 2.5 x 10(-5) g/m(2)/day. ANSI/ANS-16.1 test procedure was used to analyze the leachability of the sintered matrices and the measured leaching index value was 6.5. Thus, the use of pure calcium hydroxyapatite nano-powder as adsorbent and its cold sintering offers a mean by which radioactive waste form can be processed in an environment friendly manner.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2019-07
Language
English
Article Type
Article
Citation

JOURNAL OF HAZARDOUS MATERIALS, v.374, pp.228 - 237

ISSN
0304-3894
DOI
10.1016/j.jhazmat.2019.04.038
URI
http://hdl.handle.net/10203/263717
Appears in Collection
NE-Journal Papers(저널논문)
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