Utilization of (Ca, Mg)-Zr phosphates adsorbents saturated by Cs+, Sr2+, Co2+ ions in NZP ceramic matrices

Andrei Ivanets, Anastasiya Dzikaya, Irina Shashkova, Natalja Kitikova, Lyudmila Kulbitskaya, Mika Sillanpää

Research output: Contribution to journalArticlepeer-review

Abstract

A novel approach to the utilization of (Ca, Mg)-Zr phosphate adsorbents saturated by Cs+, Sr2+, Co2+ ions was developed. The main stages include: (i) Cs+, Sr2+, Co2+ ions adsorption, (ii) the drying and shaping by cold pressing, (iii) the sintering. Metal ions leaching from the powder of the spent adsorbent were 0.2–26.5 % in distillation water (рН 4.0–10.0) and tap water, and increased to 6.4–68.2 % in seawater. Calcination of spent adsorbents at 1000 °C led to a decrease in Cs+, Sr2+, Co2+ ions leaching to less than 1.0 % in tap and seawater. The ceramic matrices with a Cs+, Sr2+, Co2+ content of 8.0–30.2 wt %, mechanical compressive strength of 2.9–260.9 MPa, leaching rate of 1.0×10−4 - 4.3×10−7 g/(cm2×day), density of 1.4–3.4 g/cm3 were obtained by cold pressing with subsequent sintering. The samples obtained at molar ratios Zr/(Ca+Mg) of 0.35 and 0.21 were characterized by the highest compressive strength and Cs+ and Sr2+, Co2+ leaching resistance, respectively. The obtained ceramic matrices fitted to the requirements of GOST R 50926–96 and NRC 1991 for solid high-level waste forms.

Original languageEnglish
JournalJournal of the European Ceramic Society
DOIs
Publication statusAccepted/In press - 2024

Keywords

  • Cs, Sr, Co adsorption
  • Metal ions leaching
  • NZP ceramics
  • Radionuclides immobilization
  • Solid-state matrices

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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