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Study of various decontamination processes for evaporation concentrates; Etude de differents traitements de decontamination sur des concentrats d'evaporation

Abstract

Generally speaking, the evaporation concentrates are in the form of acid solutions of high salt content, about 400 g/l. The specific activity is very variable: from 0.5 mCi/l to many hundreds of Ci/l. Because of the high solubility of these salts, an attempt has been made to render the radio-elements insoluble in the concentrates before their possible coating with bitumen. With this in view, the possibility of fixing them on inorganic products, of precipitating them in the form of insoluble salts, or of adsorbing them on co-precipitates has been considered. In the case of a fixation of radio-elements by natural or synthetic inorganic products with a high absorptive capacity such as clays, diatomaceous earths, synthetic silicates and alumina, 48 products have been tried. Their selective efficiency with respect to {sup 137}Cs, {sup 90}Sr, {sup 106}Ru-Rh, {sup 144}Ce-Pr, {sup 95}Zr-Nb has been determined both with acid concentrates and with neutralized concentrates (precipitation of hydroxides). In the case of the fixation of radio-elements as insoluble salts or their adsorption on co-precipitates, the choice of treatments involved the two most dangerous radio-elements: {sup 137}Cs and {sup 90}Sr. The conventional processing methods were tried. For {sup 90}Sr. calcium carbonate, calcium oxalate, calcium phosphate, strontium  More>>
Authors:
Lefillatre, G; Cudel, Y; Rodi, L [1] 
  1. Commissariat a l'Energie Atomique, Chusclan (France). Centre de Production de Plutonium de Marcoule
Publication Date:
Jul 01, 1968
Product Type:
Technical Report
Report Number:
CEA-R-3554
Resource Relation:
Other Information: 4 refs; PBD: 1968
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; ALUMINIUM OXIDES; BARIUM SULFATES; CALCIUM CARBONATES; CALCIUM PHOSPHATES; CERIUM 144; CESIUM 137; CLAYS; DECONTAMINATION; DIATOMACEOUS EARTH; EFFICIENCY; FERROCYANIDES; HYDROXIDES; LIQUID WASTES; MANGANESE OXIDES; NIOBIUM 95; OXALATES; PRASEODYMIUM 144; RHODIUM 106; RUTHENIUM 106; STRONTIUM 90; STRONTIUM PHOSPHATES; ZIRCONIUM 95
OSTI ID:
20523338
Research Organizations:
CEA Marcoule, 30 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR04R3554091393
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
[48] pages
Announcement Date:

Citation Formats

Lefillatre, G, Cudel, Y, and Rodi, L. Study of various decontamination processes for evaporation concentrates; Etude de differents traitements de decontamination sur des concentrats d'evaporation. France: N. p., 1968. Web.
Lefillatre, G, Cudel, Y, & Rodi, L. Study of various decontamination processes for evaporation concentrates; Etude de differents traitements de decontamination sur des concentrats d'evaporation. France.
Lefillatre, G, Cudel, Y, and Rodi, L. 1968. "Study of various decontamination processes for evaporation concentrates; Etude de differents traitements de decontamination sur des concentrats d'evaporation." France.
@misc{etde_20523338,
title = {Study of various decontamination processes for evaporation concentrates; Etude de differents traitements de decontamination sur des concentrats d'evaporation}
author = {Lefillatre, G, Cudel, Y, and Rodi, L}
abstractNote = {Generally speaking, the evaporation concentrates are in the form of acid solutions of high salt content, about 400 g/l. The specific activity is very variable: from 0.5 mCi/l to many hundreds of Ci/l. Because of the high solubility of these salts, an attempt has been made to render the radio-elements insoluble in the concentrates before their possible coating with bitumen. With this in view, the possibility of fixing them on inorganic products, of precipitating them in the form of insoluble salts, or of adsorbing them on co-precipitates has been considered. In the case of a fixation of radio-elements by natural or synthetic inorganic products with a high absorptive capacity such as clays, diatomaceous earths, synthetic silicates and alumina, 48 products have been tried. Their selective efficiency with respect to {sup 137}Cs, {sup 90}Sr, {sup 106}Ru-Rh, {sup 144}Ce-Pr, {sup 95}Zr-Nb has been determined both with acid concentrates and with neutralized concentrates (precipitation of hydroxides). In the case of the fixation of radio-elements as insoluble salts or their adsorption on co-precipitates, the choice of treatments involved the two most dangerous radio-elements: {sup 137}Cs and {sup 90}Sr. The conventional processing methods were tried. For {sup 90}Sr. calcium carbonate, calcium oxalate, calcium phosphate, strontium phosphate, manganese oxides, barium sulfate. For {sup 137}Cs: the ferrocyanides of nickel, copper, zinc, cobalt and manganese. The technique consists in carrying out the precipitations (hydroxides, specific processes for {sup 90}Sr and {sup 137}Cs) one after the other without separating the precipitates. (authors) [French] D'une facon generale, les concentrats d'evaporation se presentent sous forme de solutions acides de mineralisation elevee, de l'ordre de 400 g/l. Leur activite specifique est tres variable: de 0.5 mCi/l a plusieurs centaines de Ci/l. En raison de la tres grande solubilite de ces sels, il a paru interessant de rechercher a insolubiliser les radioelements contenus dans les concentrats avant leur enrobage eventuel par le bitume. Dans ce but, la fixation sur des produits mineraux, la precipitation sous forme de sels insolubles ou l'adsorption sur des coprecipites ont ete envisagees. Dans le cas de la fixation des radioelements par des produits mineraux d'origine naturelle ou synthetique a pouvoir absorbant eleve tels que: argiles, diatomees, silicates synthetiques et alumines, 48 produits ont ete experimentes. Leur efficacite selective vis-a-vis du {sup 137}Cs - {sup 90}Sr - {sup 106}Ru-Rh - {sup 144}Ce-Pr - {sup 95}Zr-Nb a ete determinee d'une part sur des concentrats acides, d'autre part sur des concentrate neutralises (precipitation des hydroxydes). Dans le cas de la fixation des radioelements a l'etat de sels insolubles ou de leur adsorption sur des coprecipites, le choix des traitements a porte sur les 2 radioelements les plus dangereux: {sup 137}Cs - {sup 90}Sr. Les traitements classiques ont ete experimentes. Pour le {sup 90}Sr: carbonate de calcium, oxalate de calcium, phosphate de calcium, phosphate de strontium, oxydes de manganese, sulfate de baryum. Pour le {sup 137}Cs: les ferrocyanures de nickel, de cuivre, de zinc, de cobalt, de manganese. La technique a consiste a effectuer les precipitations (hydroxydes, traitements specifiques du {sup 90}Sr et {sup 137}Cs) les unes a la suite des autres sans separer les precipites. (auteurs)}
place = {France}
year = {1968}
month = {Jul}
}