Dissolution of plasma treated non-radioactive surrogate cemented concentrates and ion exchange resins in KOH solution at 40 °C

Research output: Contribution to report/book/conference proceedingsIn-proceedings paper

Institutes & Expert groups

  • NIRAS/ONDRAF

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Abstract

In Belgium, plasma incineration is a possible option to (re-)condition low and intermediate level short-lived waste streams in order to obtain end products which can fulfill the criteria developed for a near surface disposal facility. In this study, the chemical durability of lasma treated non-radioactive surrogate cemented concentrates and ion exchange resins (or plasma slags) was investigated by performing MCC-1 leach tests in a KOH solution at pH 13.5 and 40 °C. Results showed that initial dissolution rates of plasma slags were similar to that of SON68-I glass, and final dissolution rates around one order of magnitude lower. SEM analysis revealed the presence of alteration layers rich in K, Ca and Fe, which probably act as diffusion barriers and, associated with the increase of Si and Al concentration in solution, lead to the decrease of the plasma slag dissolution rates.

Details

Original languageEnglish
Title of host publicationIOP Conference Series: Materials Science and Engineering
PublisherIOP Publishing
Pages1-9
Number of pages9
Volume818
Edition2020
DOIs
Publication statusPublished - 22 Apr 2020
Event2020 - EC: theramin 2020 conference - Mechanics Institute, Manchester, United Kingdom
Duration: 4 Feb 20205 Feb 2020
http://www.theramin-h2020.eu/conference.htm

Conference

Conference2020 - EC
CountryUnited Kingdom
CityManchester
Period2020-02-042020-02-05
OtherThe EC project theramin (thermal treatment for radioactive waste minimisation and hazard reduction) will host a conference to share the results of the project and other recent developments in the fi eld of thermal treatment of radioactive waste.
Internet address

Keywords

  • Low and Intermediate Level Waste, MCC-1 leach tests, Alkaline pH, Near surface disposal facility, THERAMIN project, Plasma treated non-radioactive surrogate cemented concentrates and ion exchange resins (plasma slags)

ID: 6793060