Chemical stability of simulated waste forms Zr1–xNdxSiO4–x/2: Influence of temperature, pH and their combined effects

Lan WANG, Xirui LU, Xiaoyan SHU, Yi DING, Facheng YI, Dengsheng MA, Wei REN, Liang BIAN, Yanlin WU

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The chemical stability of simulated waste forms Zr1–xNdxSiO4–x/2 was investigated using the static leach test (MCC-1) with lixiviants of three pH values (pH=4, 6.7 and 10) at three temperature points (40, 90 and 150 °C) for periods ranging from 1 to 42 d, and the influence of temperature, pH, as well as their combined effects were explored in detail. The results showed that all the normalized release rate of Nd firstly decreased with leaching time and closed to equilibrium after 14 d. As the temperature increased, the normalized release rate of Nd also increased, but it was no more than 3×10–5 g/(m2·d). And, the normalized release rate of Nd reached the highest values (∼5×10–5 g/(m2·d)) when pH=4, whilst the normalized release rate of Nd remained the lowest value (∼1×10–5 g/(m2·d)) near neutral environment (pH=6.7).

Original languageEnglish
Pages (from-to)709-715
Number of pages7
JournalJournal of Rare Earths
Volume35
Issue number7
DOIs
Publication statusPublished - 2017 Jul

Keywords

  • chemical stability
  • nuclear waste
  • pH
  • rare earths
  • temperature
  • waste form
  • zircon

ASJC Scopus subject areas

  • Chemistry(all)
  • Geochemistry and Petrology

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