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Fixation of Radionuclides in Titanium Dioxide and Titanates via co-Precipitation; Fixation de Radioelements dans le Bioxyde de Titane et dans les Titanates par Coprecipitation; 0424 0418 041a 0421 0410 0426 0418 042f 0420 0410 0414 0418 041e 0418 0417 041e 0422 041e 041f 041e 0412 0412 0414 0412 0423 041e 041a 0418 0421 0418 0422 0418 0422 0410 041d 0410 0418 1 0418 0422 0410 041d 0410 0422 0410 0425 041c 0415 0422 041e 0414 041e 041c 0421 041e 041e 0421 0410 0416 0414 0415 041d 0418 042f ; Fijacion de Radionuclidos en Dioxido de Titanio y Titanatos por Coprecipitacion

Conference:

Abstract

Calcination and adsorption on clay minerals are the most frequently studied ways of radionuclide fixation. A third way - fixation via co-precipitation - has not attracted much interest up to now. The characteristic for all three methods is high-temperature treatment of a pre-product containing the radioactivity, but they differ in introducing the activity into this pre-product. The disadvantages of co-precipitation are the difficult separation of the highly active sludge from solution and its bad qualification for caesium removal. Its advantages are the suitability for head-end processes, the less restricted volume capacity compared with clay mineral adsorption, and the avoidance of evaporation operations. Therefore it seemed worth while to look more closely into the chemistry of proper co-precipitation systems. The first system chosen was TiO{sub 2} * aq because of the good fixation qualities of TiO{sub 2} and titanates. The co-precipitation properties of TiO{sub 2} * aq were studied under different experimental conditions. For some radionuclides the distribution coefficient was found to be as good as or better than that for other oxide hydrates. High concentration of the radionuclide ion or similar ions causes decreasing distribution coefficient. This could be avoided by simultaneously precipitating carbonates or oxalates which remove the bulk  More>>
Authors:
Levi, H. W. [1] 
  1. Hahn-Meitner Institut fuer Kernforschung, Berlin-Wannsee, Federal Republic of Germany (Germany)
Publication Date:
Feb 15, 1963
Product Type:
Conference
Resource Relation:
Conference: Symposium on Treatment and Storage of High-Level Radioactive Wastes Radioactive Wastes, Vienna (Austria), 8-12 Oct 1962; Other Information: 2 refs., 4 tabs., 2 figs.; Related Information: In: Treatment and Storage of High-Level Radioactive Wastes. Proceedings of the Symposium on Treatment and Storage of High-Level Radioactive Wastes| 686 p.
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; ADSORPTION; CALCINATION; CARBONATES; CESIUM; CLAYS; COPRECIPITATION; EVAPORATION; HEAD END PROCESSES; IONS; OXALATES; RADIOACTIVE WASTE DISPOSAL; RADIOACTIVE WASTE PROCESSING; RADIOACTIVE WASTES; RADIOISOTOPES; SLUDGES; TITANATES; TITANIUM OXIDES
OSTI ID:
22182135
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA13M3597006634
Submitting Site:
INIS
Size:
page(s) 587-594
Announcement Date:
Jan 23, 2014

Conference:

Citation Formats

Levi, H. W. Fixation of Radionuclides in Titanium Dioxide and Titanates via co-Precipitation; Fixation de Radioelements dans le Bioxyde de Titane et dans les Titanates par Coprecipitation; 0424 0418 041a 0421 0410 0426 0418 042f 0420 0410 0414 0418 041e 0418 0417 041e 0422 041e 041f 041e 0412 0412 0414 0412 0423 041e 041a 0418 0421 0418 0422 0418 0422 0410 041d 0410 0418 1 0418 0422 0410 041d 0410 0422 0410 0425 041c 0415 0422 041e 0414 041e 041c 0421 041e 041e 0421 0410 0416 0414 0415 041d 0418 042f ; Fijacion de Radionuclidos en Dioxido de Titanio y Titanatos por Coprecipitacion. IAEA: N. p., 1963. Web.
Levi, H. W. Fixation of Radionuclides in Titanium Dioxide and Titanates via co-Precipitation; Fixation de Radioelements dans le Bioxyde de Titane et dans les Titanates par Coprecipitation; 0424 0418 041a 0421 0410 0426 0418 042f 0420 0410 0414 0418 041e 0418 0417 041e 0422 041e 041f 041e 0412 0412 0414 0412 0423 041e 041a 0418 0421 0418 0422 0418 0422 0410 041d 0410 0418 1 0418 0422 0410 041d 0410 0422 0410 0425 041c 0415 0422 041e 0414 041e 041c 0421 041e 041e 0421 0410 0416 0414 0415 041d 0418 042f ; Fijacion de Radionuclidos en Dioxido de Titanio y Titanatos por Coprecipitacion. IAEA.
Levi, H. W. 1963. "Fixation of Radionuclides in Titanium Dioxide and Titanates via co-Precipitation; Fixation de Radioelements dans le Bioxyde de Titane et dans les Titanates par Coprecipitation; 0424 0418 041a 0421 0410 0426 0418 042f 0420 0410 0414 0418 041e 0418 0417 041e 0422 041e 041f 041e 0412 0412 0414 0412 0423 041e 041a 0418 0421 0418 0422 0418 0422 0410 041d 0410 0418 1 0418 0422 0410 041d 0410 0422 0410 0425 041c 0415 0422 041e 0414 041e 041c 0421 041e 041e 0421 0410 0416 0414 0415 041d 0418 042f ; Fijacion de Radionuclidos en Dioxido de Titanio y Titanatos por Coprecipitacion." IAEA.
@misc{etde_22182135,
title = {Fixation of Radionuclides in Titanium Dioxide and Titanates via co-Precipitation; Fixation de Radioelements dans le Bioxyde de Titane et dans les Titanates par Coprecipitation; 0424 0418 041a 0421 0410 0426 0418 042f 0420 0410 0414 0418 041e 0418 0417 041e 0422 041e 041f 041e 0412 0412 0414 0412 0423 041e 041a 0418 0421 0418 0422 0418 0422 0410 041d 0410 0418 1 0418 0422 0410 041d 0410 0422 0410 0425 041c 0415 0422 041e 0414 041e 041c 0421 041e 041e 0421 0410 0416 0414 0415 041d 0418 042f ; Fijacion de Radionuclidos en Dioxido de Titanio y Titanatos por Coprecipitacion}
author = {Levi, H. W.}
abstractNote = {Calcination and adsorption on clay minerals are the most frequently studied ways of radionuclide fixation. A third way - fixation via co-precipitation - has not attracted much interest up to now. The characteristic for all three methods is high-temperature treatment of a pre-product containing the radioactivity, but they differ in introducing the activity into this pre-product. The disadvantages of co-precipitation are the difficult separation of the highly active sludge from solution and its bad qualification for caesium removal. Its advantages are the suitability for head-end processes, the less restricted volume capacity compared with clay mineral adsorption, and the avoidance of evaporation operations. Therefore it seemed worth while to look more closely into the chemistry of proper co-precipitation systems. The first system chosen was TiO{sub 2} * aq because of the good fixation qualities of TiO{sub 2} and titanates. The co-precipitation properties of TiO{sub 2} * aq were studied under different experimental conditions. For some radionuclides the distribution coefficient was found to be as good as or better than that for other oxide hydrates. High concentration of the radionuclide ion or similar ions causes decreasing distribution coefficient. This could be avoided by simultaneously precipitating carbonates or oxalates which remove the bulk oi the ions. The influence of high aluminium content was studied as well. An investigation of the formation of anatas and rutil from pure TiO{sub 2} * aq precipitates and of titanates from TiO{sub 2} * aq + carbonate or oxalate precipitates during high-temperature treatment was started. (author) [French] La calcination et l'adsorption par les mineraux argileux sont les modes de fixation des radioelements les plus frequemment etudies. Une troisieme methode, la fixation par coprecipitation, n'a guere suscite d'interet jusqu'a present. Ces trois methodes ont un point commun: le traitement a haute temperature des matieres radioactives, mais elles different quant au mode de fixation dans le produit final. La coprecipitation presente deux inconvenients: il est difficile de separer les boues de haute activite de la solution; elle se prete mal a la separation du cesium. Ses avantages sont les suivants: elle permet un traitement sans phase intermediaire; elle permet de traiter des quantites plus considerables que la methode d'adsorption par les mineraux argileux; elle permet d'eviter les operations d'evaporation. Aussi a-t-il paru interessant d'etudier de maniere plus approfondie la chimie de systemes de coprecipitation appropries. Le premier systeme choisi etait constitue par du bioxyde de titane en solution aqueuse, a cause des excellentes proprietes de fixation de TiO{sub 2} et des titanates. On a etudie, dans differentes conditions experimentales, comment cette solution se pretait a la coprecipitation. Pour certains radioelements, le coefficient de distribution etait aussi bon ou meme meilleur qu'avec les autres oxydes en solution aqueuse. Une forte concentration d'ions de radioelement ou d'ions similaires entraine une diminution du coefficient de distribution. On peut y remedier en precipitant simultanement des carbonates ou des oxalates qui absorbent la plus grande partie des ions. L'influence d'une forte teneur en aluminium a egalement ete etudiee. On a entrepris une nouvelle serie d'experiences sur la formation, au cours du traitement a haute temperature, d'anatase et de rutile a partir de precipites de solutions aqueuses de TiO{sub 2} pur et de titanates a partir de precipites de solutions aqueuses de TiO{sub 2} et d'un carbonate ou d*un oxalate. (author) [Spanish] Los metodos de fijacion de radionuclidos mas frecuentemente estudiados son la calcinacion y la adsorcion en minerales arcillosos. Un tercer procedimiento (la fijacion por coprecipitacion) no ha despertado mucho interes hasta el presente. Los tres metodos se caracterizan por el tratamiento a temperatura elevada de un producto inicial que contiene la sustancia radiactiva, pero difieren en la manera de introducir dicha sustancia en ese producto. Los inconvenientes de la coprecipitacion son las dificultades que presenta la separacion del lodo intensamente radiactivo de la solucion y su escasa capacidad de eliminar el cesio. Las ventajas son sus buenas cualidades para procesos ciclicos, una disminucion menor del volumen util en comparacion con la adsorcion en minerales arcillosos y la posibilidad de suprimir las operaciones de evaporacion. Se ha considerado, pues, que merece la pena estudiar con mas detalle la quimica de sistemas apropiados de coprecipitacion. El primer sistema utilizado ha sido el TiO{sub 2} * aq debido a las favorables propiedades de fijacion del TiO{sub 2} y de los titanatos. Se han estudiado las propiedades de coprecipitacion del TiO{sub 2} * aq en diferentes condiciones experimentales. En el caso de algunos radioniiclidos el coeficiente de distribucion obtenido es por lo menos tan favorable como para otros oxidos hidratados. El coeficiente de distribucion disminuye cuando la concentracion de iones del radionuclido o de iones analogos es elevada. Ello puede evitarse coprecipitando carbonatos u oxalatos que eliminen la mayor parte de los iones. Tambien se ha estudiado la influencia de un contenido elevado en aluminio. Se ha emprendido una investigacion sobre la formacion de anatasa y rutilo a partir de precipitados puros de TiO{sub 2} * aq y de titanatos a partir de precipitados deTiO{sub 2} * aq+ carbonato u oxalato durante el tratamiento a elevada temperatura. (author) [Russian] Kal'cinirovanie i sorbcija na glinistyh mineralah javljajutsja naibolee issledovannymi sposobami fiksirovanija radio- izotopov. Tretij put' - fiksirovanie putem soosazhdenija - ne vyzyval do nastojashhego vremeni bol'shogo interesa. Obshhim dlja vseh treh metodov javljaetsja vysokotemperaturnaja obrabotka predvaritel'nogo produkta> soderzhashhego radioaktivnost'. Razlichie zakljuchaetsja v sposobe vvedenija aktivnosti v jetot predvaritel'nyj produkt. Nedostatkami soosazhdenija javljajutsja trudnost' otdelenija vysokoaktivnogo shlamma ot rastvora i nizkaja stepen' udalenija cezija, a preimushhestvami - prigodnost' dlja predvaritel'nyh processov, menee ogranichennaja ob{sup e}mnaja emkost' po sravneniju s sorbcionnoj sposobnost'ju glinistyh mineralov i otsutstvie stadii vyparivanija. Pojetomu predstavljaetsja zhelatel'nym podrobnee rassmotret' himiju sootvetstvujushhih sistem soosazhdenija. Pervoj byla vybrana sistema TiO{sub 2} blagodarja horoshim fiksirujushhim kachestvam TiO{sub 2} i titanatov. Soosaditel'nye svojstva TiO{sub 2} * H{sub 2}O izuchalis' v razlichnyh jeksperimental'nyh uslovijah. Dlja nekotoryh radioizotopov kojefficient raspredelenija okazalsja takim zhe ili luchshim, chem v sluchae drugih gidratov okisi. Vysokaja koncentracija radioizotopa ili analogichnyh emu ionov vyzyvaet umen'shenie kojefficienta raspredelenija. Jetogo mozhno izbezhat' odnovremennym osazhdeniem karbonatov ili oksalatov, v rezul'tate kotorogo udaljaetsja osnovnoe kolichestvo ionov. Izuchalos' takzhe vlijanie aljuminija, prisutstvujushhego v bol'shih kolichestvah. Nachato issledovanie obrazovanija oktajedrita i rutila iz chistogo osadka TiO{sub 2} * H{sub 2}O i titanatov iz osadkov TiO{sub 2} * H{sub 2}O+ karbonat ili oksalat v processe vysokotemperaturnoj obrabotki. (author)}
place = {IAEA}
year = {1963}
month = {Feb}
}