Published February 2006 | Version v1
Report Restricted

Dissolution of Sr precipitated with platinum group metals at the precipitation step by denitration in the 4-group partitioning process

Creators

  • 1. Japan Atomic Energy Agency, Nuclear Safety Research Center, Tokai, Ibaraki (Japan)
  • 2. Japan Atomic Energy Agency, Nuclear Science and Engineering Directorate, Tokai, Ibaraki (Japan)

Description

The precipitation method by denitration with formic acid is adopted in the 4-Group Partitioning Process for recovery of Tc and platinum group metals (PGM) from high-level liquid waste. A part of Sr and some other elements are precipitated as carbonate and hydroxide salts with Tc and PGM at the precipitation step by denitration. As Sr is one of the target elements of the 4-Group Partitioning Process, it is necessary to recover the precipitated Sr from Tc and PGM fraction. The present study deals with the process for dissolving the precipitate of Tc and PGM at the precipitation step to recover the precipitated Sr from Tc and PGM fraction. It was possible to dissolve the precipitated Sr thoroughly by 0.010 mol/dm3 nitric acid without dissolving PGM precipitate. Ba and Ni were contained in dissolved Sr solution. Any Sr was not appeared in the dissolved solution of PGM precipitate which remained after the Sr dissolution by 0.010 mol/dm3 nitric acid. The pH of the dissolved Sr solution was about 2. As the appropriate pH is 5 or higher to adsorb Sr on inorganic ion exchangers, it is demanded to adjust the pH of dissolved Sr solution for next treatment. Precipitation of Sr did not occur during adjusting the pH of dissolved Sr solution to neutral region with sodium hydroxide solution. (author)

Availability note (English)

Available from JAEA; DOI: https://doi.org/10.11484/jaea-research-2006-003

Files

Restricted

The record is publicly accessible, but files are restricted to users with access.

System files (66.5 kB)

Name Size Download all

Additional details

Identifiers

DOI
10.11484/jaea-research-2006-003;

Publishing Information

Imprint Pagination
28 p.
Report number
JAEA-Research--2006-003

INIS

Country of Publication
Japan
Country of Input or Organization
Japan
INIS RN
37081755
Subject category
S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
Descriptors DEI
ACETIC ACID; DENITRATION; DISSOLUTION; HIGH-LEVEL RADIOACTIVE WASTES; LIQUID WASTES; MATERIALS RECOVERY; NITRIC ACID; PARTITION; PH VALUE; PLATINUM METALS; PRECIPITATION; STIMULATION; STRONTIUM
Descriptors DEC
ALKALINE EARTH METALS; CARBOXYLIC ACIDS; CHEMICAL REACTIONS; ELEMENTS; HYDROGEN COMPOUNDS; INORGANIC ACIDS; INORGANIC COMPOUNDS; MANAGEMENT; MATERIALS; METALS; MONOCARBOXYLIC ACIDS; NITROGEN COMPOUNDS; ORGANIC ACIDS; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; PROCESSING; RADIOACTIVE MATERIALS; RADIOACTIVE WASTES; SEPARATION PROCESSES; TRANSITION ELEMENTS; WASTE MANAGEMENT; WASTE PROCESSING; WASTES

Optional Information

Notes
13 refs., 8 figs., 9 tabs.