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Immobilization of Radioactive Corrosion Products by Cold Sintering of Pure Hydroxyapatite

Immobilization of Radioactive Corrosion Products by Cold Sintering of Pure Hydroxyapatite

Muhmood Ul Hassan, Sajid Iqbal, Jong-Il Yun, Ho Jin Ryu

J Hazard Mater. 2019 Jul 15;374:228-237.

PMID: 31005705

Abstract:

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 °C, a temperature significantly lower than conventional sintering temperatures (900-1300 °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 × 10-5 g/m2/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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP7732185	Pure Water Density Standard		7732-18-5	Price

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