Abrégé

24222O is excluded.

Classes IPC  ?

• F28D 20/00 - Appareils ou ensembles fonctionnels d'accumulation de chaleur en généralAppareils échangeurs de chaleur de régénération non couverts par les groupes ou

Abrégé

The invention relates to solid material which has an open multiple porosity and is at least partially interconnected, comprising an inorganic matrix made of a microporous and mesoporous geopolymer, in which at least partially interconnected open macropores are provided which are delimited by partitions or walls made of a microporous and mesoporous geopolymer, and comprising particles of at least one solid compound different from the geopolymer, which are distributed in the macropores and/or in the partitions or walls. A method for the preparation of said material is also disclosed. The invention also relates to a method for separating at least one metal or metalloid cation from a liquid medium containing same, wherein said liquid medium is brought into contact with said material.

Classes IPC  ?

• B01J 20/16 - Alumino-silicates
• B01J 20/18 - Tamis moléculaires zéolitiques synthétiques
• B01J 20/28 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtrationAbsorbants ou adsorbants pour la chromatographieProcédés pour leur préparation, régénération ou réactivation caractérisées par leur forme ou leurs propriétés physiques
• B01J 20/30 - Procédés de préparation, de régénération ou de réactivation
• C01B 32/26 - Préparation
• C02F 1/28 - Traitement de l'eau, des eaux résiduaires ou des eaux d'égout par absorption ou adsorption
• C04B 28/00 - Compositions pour mortiers, béton ou pierre artificielle, contenant des liants inorganiques ou contenant le produit de réaction d'un liant inorganique et d'un liant organique, p. ex. contenant des ciments de polycarboxylates
• C02F 101/00 - Nature du contaminant
• C02F 101/20 - Métaux lourds ou leurs composés

Abrégé

The invention relates to methods for determining the acidity of an acidic aqueous solution. These methods allow measurement of the total acidity of an aqueous solution comprising a strong acid or a mixture of strong acids and, if this solution contains one or more hydrolysable cations, also allow the free acidity thereof to be measured. Applications: any industrial field and any field of scientific research in which it may be desirable to measure the total acidity or the free acidity of aqueous solutions of strong acids.

Classes IPC  ?

• G01N 31/22 - Utilisation des réactifs chimiques
• G01N 21/77 - Systèmes dans lesquels le matériau est soumis à une réaction chimique, le progrès ou le résultat de la réaction étant analysé en observant l'effet sur un réactif chimique

Abrégé

The invention relates to the use of a thiosulfate as a retarder for a cement paste comprising a magnesium phosphate cement. Applies to: civil engineering.

Classes IPC  ?

• C04B 28/34 - Compositions pour mortiers, béton ou pierre artificielle, contenant des liants inorganiques ou contenant le produit de réaction d'un liant inorganique et d'un liant organique, p. ex. contenant des ciments de polycarboxylates contenant des liants phosphate froids
• C04B 103/22 - Retardateurs de prise

Produits et services

Logistics services regarding transport of nuclear fuels and waste; storage of nuclear waste at a centralized site. Treatment of nuclear fuels, including treatment of nuclear fuel assemblies, differentiated treatment of nuclear fuels according to the composition of the nuclear fuel assemblies, separation of materials and elements constituting the nuclear fuel assemblies into recoverable, recyclable or reusable materials and elements on the one hand and non-recoverable materials and elements considered as waste on the other hand; characterization, treatment and return of waste including a differentiated treatment according to the composition of solid, liquid or gaseous nuclear waste and treatment thereof to immobilize them and pack them in the form of packages for storage or disposal thereof.

Abrégé

The invention relates to a method for conditioning an acid waste by cementation, wherein the acid waste is chosen among liquids of pH less than or equal to 4, semi-liquids of pH less than or equal to 4, solids for which partial or total dissolving in water leads to a solution or a suspension of pH less than or equal to 4, and mixtures thereof, which method comprises the steps of: a) preparing a cement paste having as components at least: a phosphomagnesium cement and the acid waste, and b) curing the cement paste thus obtained, and is characterised in that in step a), the cement paste is prepared without the acid waste having been subjected beforehand to a treatment consisting of lowering its acidity. The invention is applicable for conditioning any acid waste whatever its origin and, more specifically, acid waste produced in the nuclear industry.

Classes IPC  ?

• B09B 3/00 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif
• C04B 28/34 - Compositions pour mortiers, béton ou pierre artificielle, contenant des liants inorganiques ou contenant le produit de réaction d'un liant inorganique et d'un liant organique, p. ex. contenant des ciments de polycarboxylates contenant des liants phosphate froids
• G21F 9/16 - Traitements par fixation dans un milieu solide stable

Abrégé

The invention relates to a frame (20) for eyewear for protecting against ionizing radiation, comprising a frontal portion (30) extending laterally by the two lateral protective elements (50), and a device (60) for maintaining the frame on the face of a user under the conditions under which it is worn, and characterized in that the lateral protective elements are integrally formed with the frontal portion and in that the frontal portion and the lateral protective elements are made of a radio-attenuation material. The invention also relates to eyewear (10) for protecting against ionizing radiation comprising such a frame and to an assembly comprising this eyewear and a device for distributing weight. Applications: protection of individuals liable to be exposed to ionizing radiation in the exercise of their professional activity.

Classes IPC  ?

• A61F 9/02 - Lunettes protectrices
• G02C 5/14 - Branches
• G21F 3/02 - Habillement

Abrégé

The invention relates to a method of determining a quantity of a first radioisotope in a source term, disintegrating into a second radioisotope, the radioisotopes respectively emitting first and second gamma rays screened by the source term, the method comprising the steps: a) determining the theoretical ratio of counts between the first and second rays emitted in the absence of screening; b) measuring the net counts associated with the first and second rays emitted by the first and second radioisotopes; c) determining the screening rates of the first and second rays by the source term based on the ratio obtained in step a) and the counts obtained in step b); d) determining the quantity of the first radioisotope based on the screening rate of either the first or the second ray determined in step c).

Classes IPC  ?

• G01T 1/167 - Mesure du contenu radioactif des objets, p. ex. contamination

Abrégé

382221+21+21+2 into an aqueous phase and a solid phase comprising the particles of uranium(IV) oxalate and the particles of plutonium(IV) oxalate; and d) calcining the solid phase to convert (1) the particles of uranium(IV) oxalate to particles of triuranium octoxide and (2) the particles of plutonium(IV) oxalate to particles of plutonium(IV) dioxide, whereby the powder is obtained; and and in that steps b) and c) are performed simultaneously or successively. Applications: fabrication of nuclear fuels of MOX type, e.g. for LWR or FNR reactors.

Classes IPC  ?

• G21C 3/62 - Combustible céramique
• G21C 19/46 - Procédés aqueux

Abrégé

The invention relates to the use of ureas as extractants for fully or partially separating uranium(VI) from plutonium(IV) in an aqueous solution obtained by dissolving a spent nuclear fuel in nitric acid, by means of liquid-liquid extraction, without carrying out any reduction of the plutonium(IV) to plutonium(III). The invention also relates to new ureas. Uses are the processing of spent nuclear fuels based on uranium (especially uranium oxides - UOX) or uranium and plutonium (especially mixed uranium and plutonium oxides - MOX).

Classes IPC  ?

• B01D 11/04 - Extraction par solvants de solutions
• C01G 56/00 - Composés des éléments transuraniens
• C22B 3/32 - Acides carboxyliques
• C22B 60/02 - Obtention du thorium, de l'uranium ou des autres actinides
• B01D 11/02 - Extraction par solvants de solides
• C07C 275/00 - Dérivés d'urée, c.-à-d. composés contenant l'un des groupes les atomes d'azote ne faisant pas partie de groupes nitro ou nitroso

Abrégé

The invention relates to a process for preparing pellets of a dense mixed fuel comprising uranium dioxide UO2, plutonium oxide PuO2 and optionally at least one oxide of minor actinide(s) or of a fuel comprising a solid solution of uranium dioxide, plutonium and optionally at least one minor actinide successively comprising the following steps: a) a step of co-micronization of a mixture of powders comprising a powder of uranium oxide(s), of which all or some of this powder consists of triuranium octoxide U3O8, a powder of plutonium oxide PuO2 and optionally a powder of oxide(s) of minor actinide(s); b) a step of compacting the mixture of powders in the form of pellets; c) a step of sintering the pellets obtained in b).

Classes IPC  ?

• G21C 3/62 - Combustible céramique
• G21C 19/48 - Procédés non aqueux

Abrégé

The invention relates to a containment airlock (1), in particular an airlock for intervention on a site likely to be contaminated with radiation, asbestos and biological and/or chemical agents. The containment airlock (1) comprises a self-supporting frame (3) and a flexible containment shell (5). The shell (5) is configured to be assembled with the frame (3). The frame (3) is articulated so as to be extensible between a folded storage position and an extended intervention position. The frame (3) comprises articulated reinforcement rods (7). The articulated reinforcement rods (7) comprise rigid segments (72, 74) and at least one intermediate articulation (8) connecting the segments (72, 74).

Classes IPC  ?

• E04H 1/12 - Petits bâtiments ou autres constructions pour occupation limitée, élevés en plein air ou aménagés à l'intérieur de bâtiments, p. ex. kiosques, abris pour arrêts d'autobus ou pour stations de distribution d'essence, toits pour quais de gare, guérites de gardien ou cabines de bains
• E04H 15/48 - Moyens de support, p. ex. armatures repliables, p. ex. du type démontable pliables, c.-à-d. avec des charnières ou des gonds
• G21F 7/00 - Cellules ou chambres blindées
• E04H 15/42 - Moyens de support, p. ex. armatures du type extérieur, p. ex. dont l'armature est hors de la couverture

Abrégé

The invention relates to novel dissymmetric RN,N-dialkylamides of formula (I) in which: R1 represents a linear C1 to C4 alkyl, R2 represents a linear C1 to C10 alkyl, and R3 represents a linear or branched C6 to C15 alkyl, provided that R3 is different from a n-octyl, n-decyl, n-dodecyl, 2-ethylhexyl and 2-ethyloctyl group when R1 represents a n-butyl group and R2 represents an ethyl group. The invention also relates to a method for synthesising said N,N-dialkylamides, and to the uses of same for extracting uranium and/or plutonium from an aqueous acid solution or for fully or partially separating the uranium from the plutonium contained in an aqueous acid solution and, in particular, to a solution resulting from the dissolution of spent nuclear fuel in nitric acid. The invention further relates to a method for the treatment of an aqueous solution resulting from the dissolution of spent nuclear fuel in nitric acid, which allows the uranium and the plutonium contained in said solution to be extracted, separated and decontaminated in a single cycle, without having to perform a plutonium reduction operation, and in which one of said N,N-dialkylamides or a mixture of same is used as an extractant. The invention is applicable in the treatment of spent nuclear fuel.

Classes IPC  ?

• C07C 233/05 - Amides d'acides carboxyliques ayant des atomes de carbone de groupes carboxamide liés à des atomes d'hydrogène ou à des atomes de carbone acycliques ayant les atomes d'azote des groupes carboxamide liés à des atomes d'hydrogène ou à des atomes de carbone de radicaux hydrocarbonés non substitués avec des atomes de carbone de groupes carboxamide liés à des atomes de carbone d'un squelette carboné saturé acyclique ayant les atomes d'azote des groupes carboxamide liés à des atomes d'hydrogène ou à des atomes de carbone acycliques
• C22B 60/02 - Obtention du thorium, de l'uranium ou des autres actinides
• C22B 60/04 - Obtention du plutonium

Abrégé

An apparatus (1) for thermal denitration of a uranyl nitrate hydrate to uranium trioxide UO3. The apparatus (1) comprises a burner (114) and a reaction chamber (110) configured to carry out thermal denitration of uranyl nitrate hydrate and to form uranium trioxide UO3 in the form of particles. The apparatus also comprises a separating chamber (120) suitable for separating UO3 particles from the gases resulting from the thermal denitration carried out in the reaction chamber (110), and at least one filter (130) configured for purifying the gases. The separating chamber (120) is a decanting chamber into which the reaction chamber (110) directly opens out. The filter (130) is capable of performing the separation at a temperature greater than or equal to 350° C. The invention also relates to use of such an apparatus, to a thermal denitration process and to UO3 particles obtained by such a process.

Classes IPC  ?

• B01J 8/00 - Procédés chimiques ou physiques en général, conduits en présence de fluides et de particules solidesAppareillage pour de tels procédés
• C01G 43/01 - OxydesHydroxydes
• B01J 19/24 - Réacteurs fixes sans élément interne mobile
• B01J 19/26 - Réacteurs du type à injecteur, c.-à-d. dans lesquels la distribution des réactifs de départ dans le réacteur est effectuée par introduction ou injection au moyen d'injecteurs
• B01J 4/00 - Dispositifs d'alimentationDispositifs de commande d'alimentation ou d'évacuation
• B01D 50/20 - Combinaisons de dispositifs couverts par les groupes et
• B01D 39/20 - Autres substances filtrantes autoportantes en substance inorganique, p. ex. papier d'amiante ou substance filtrante métallique faite de fils métalliques non-tissés
• B01D 45/08 - Séparation de particules dispersées dans des gaz ou des vapeurs par gravité, inertie ou force centrifuge par inertie par projection contre les diaphragmes séparateurs
• B01D 49/00 - Séparation de particules dispersées dans l'air, des gaz ou des vapeurs par d'autres méthodes
• B01J 6/00 - CalcinationCuisson

Abrégé

The invention concerns a solid nanocomposite material comprising nanoparticles of a hexacyanometallate or octacyanometallate of an alkali metal and a transition metal, of formula [Alk+ x]Mn+ [M'(CN)m] z- in which Alk is an alkali metal, x is 1 or 2, M is a transition metal, n is 2 or 3, M' is a transition metal, m is 6 or 8, z is 3 or 4, attached to at least one surface of a porous inorganic solid support, in which the nanoparticles are attached by adsorption to said at least one surface of the solid support, and in which said surface is a basic surface. The invention also concerns a method for preparing this material, and a method for extracting at least one metal cation from a liquid medium containing it, that involves bringing said liquid medium into contact with said material.

Classes IPC  ?

• B01J 20/04 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtrationAbsorbants ou adsorbants pour la chromatographieProcédés pour leur préparation, régénération ou réactivation contenant une substance inorganique contenant des composés des métaux alcalins, des métaux alcalino-terreux ou du magnésium
• B01J 20/28 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtrationAbsorbants ou adsorbants pour la chromatographieProcédés pour leur préparation, régénération ou réactivation caractérisées par leur forme ou leurs propriétés physiques
• B01J 20/32 - Imprégnation ou revêtement
• C02F 1/28 - Traitement de l'eau, des eaux résiduaires ou des eaux d'égout par absorption ou adsorption
• C01C 3/08 - Cyanures métalliques simples ou complexes
• C01C 3/12 - Cyanures de fer simples ou complexes
• G21F 9/12 - Traitements par absorptionTraitements par adsorptionTraitements par échange d'ions
• C02F 101/00 - Nature du contaminant
• C02F 101/20 - Métaux lourds ou leurs composés

Abrégé

The invention relates to a process for immobilizing a mercury-containing waste, which comprises: - stabilizing the mercury of the waste by precipitating the mercury as mercury (II) sulfide; then - encapsulating the waste by cementation, the cementation comprising coating the waste in a cement paste obtained by mixing a composition comprising a powder of at least one binder chosen from hydraulic cements, alkali-activated cements and acid-activated cements, with an aqueous mixing solution, then hardening the cement paste; and which is characterized in that the precipitation of the mercury as mercury (II) sulfide is obtained by reacting the mercury with a thiosulfate in a basic aqueous medium, while stirring and in the presence of a sulfide of an alkali metal, the molar ratio of the thiosulfate to the mercury being at least equal to 1. Applications: immobilization of any mercury-containing waste regardless of the origin thereof and, in particular, of mercury-containing waste from nuclear facilities.

Classes IPC  ?

• A62D 3/33 - Procédés pour rendre les substances chimiques nuisibles inoffensives ou moins nuisibles en effectuant un changement chimique dans les substances par réaction avec des agents chimiques par fixation chimique de la substance nuisible, p. ex. par chélation ou complexation
• A62D 101/24 - Substances organiques contenant des métaux lourds
• A62D 101/43 - Substances inorganiques contenant des métaux lourds à l'état lié ou libre

Abrégé

The invention relates to a method for dissolving nuclear fuel, in particular irradiated nuclear fuel, which comprises submerging the nuclear fuel in a nitric acid solution. According to the invention, said dissolution method also comprises mechanical crushing of the nuclear fuel, said mechanical crushing being carried out in the nitric acid solution during said submersion. The invention likewise relates to the use of a crusher provided with mechanical crushing means for carrying out such a dissolution method.

Classes IPC  ?

• G21C 19/46 - Procédés aqueux
• G21C 19/36 - Moyens mécaniques uniquement

Abrégé

The invention relates to a sludge suction head (5) which can be used in particular in radioactive environments and comprises a screen (52), sludge comminuting means (7), and sludge diluting means (60).

Classes IPC  ?

• G21F 9/04 - Traitement des liquides
• E01F 3/00 - Aires d'atterrissage pour hélicoptères, p. ex. installées sur des bâtiments
• E02B 3/00 - Ouvrages relatifs au contrôle ou à l'utilisation des cours d'eau, rivières, côtes ou autres emplacements maritimesÉtanchements ou joints pour travaux de génie civil en général

Abrégé

The present invention concerns a method for preventing, slowing or stopping the dissolution of a compound generating a gas when it is brought into contact with a dissolution solution, and doing so, optionally, with respect to the dissolution of another compound that does not generate any gas when it is brought into contact with said same dissolution solution, the method comprising the addition, to the dissolution solution, of at least one anti-foaming agent chosen from the group consisting of solid hydrophobic particles, silicone oils, polar oils and the mixtures of same.

Classes IPC  ?

• B09B 3/00 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif
• B09C 1/02 - Extraction au moyen de liquides, p. ex. lavage, lixiviation
• C22B 7/00 - Mise en œuvre de matériaux autres que des minerais, p. ex. des rognures, pour produire des métaux non ferreux ou leurs composés
• G21G 5/00 - Conversion supposée des éléments chimiques par réaction chimique

Abrégé

The present invention relates to a method for selective dissolution of a first solid compound present in a mixture with respect to at least one second solid compound different from said first solid compound, also present in said mixture, wherein said method comprises at least one step consisting in bringing said mixture into contact with a dissolving solution in which said first solid compound is dissolved, generating at least one gaseous compound, and in which said second solid compound is dissolved without generating any gaseous compound, said dissolving solution comprising at least one non-ionic surfactant.

Classes IPC  ?

• B09B 3/00 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif
• B09C 1/02 - Extraction au moyen de liquides, p. ex. lavage, lixiviation
• C22B 7/00 - Mise en œuvre de matériaux autres que des minerais, p. ex. des rognures, pour produire des métaux non ferreux ou leurs composés
• G21G 5/00 - Conversion supposée des éléments chimiques par réaction chimique

Abrégé

The invention relates to a method for predicting the bioavailability of a radioelement in an animal living organism following the contamination of said organism by said radioelement, said method comprising the steps of: (a) producing a gel imitating the area of contamination in said animal living organism and in which said radioelment is uniformly distributed; (b) bringing the gel produced in said step (a) into contact with a solution imitating a biological fluid associated with the area of contamination in said animal living organism, then stirring the mixture; and (c) measuring the quantity of said radioelement in said solution at a given moment t, said measurement allowing the prediction of the bioavailability of said radioelement in said animal living organism. The invention also relates to the use of such a method for identifying a molecule exhibiting chelating properties in relation to a given radioelement and/or for characterising the chelating properties of a molecule.

Classes IPC  ?

• G01N 33/487 - Analyse physique de matériau biologique de matériau biologique liquide

Abrégé

The invention relates to the use of hydroxy-imine alkanoic acids including at least four carbon atoms as anti-nitrous agents in operations of reductive back-extraction of plutonium. The invention may be useful in any method for reprocessing spent nuclear fuel that includes one or more operations of reductive back-extraction of plutonium and, more particularly, in the PUREX method as implemented in modern nuclear fuel reprocessing plants, as well as in processes derived therefrom.

Classes IPC  ?

• G21C 19/46 - Procédés aqueux
• G21F 9/06 - Traitements

Abrégé

8 is separated from the aqueous suspension. 8 obtained at the end of step c) of the activation method.

Classes IPC  ?

• C01G 43/01 - OxydesHydroxydes
• C01B 15/047 - Peroxydes métalliques ou leurs peroxyhydratesSuperoxydesOzonides de métaux lourds
• C01G 43/00 - Composés de l'uranium
• C22B 3/00 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés

Abrégé

and the pH of the suspension is maintained in steps a) and b) at a value comprised between 2 and 3.

Classes IPC  ?

• C01G 43/01 - OxydesHydroxydes
• C01B 15/047 - Peroxydes métalliques ou leurs peroxyhydratesSuperoxydesOzonides de métaux lourds
• C01G 43/06 - Fluorures

Abrégé

c) stripping the uranyl nitrate of the organic phase obtained at the end of step b), by circulating this organic phase in an apparatus, as a counter current against an aqueous phase A3. The extractant is an N,N-dialkylamide and the ratio between the flow rate at which the organic phase obtained at the end of step b) and the aqueous phase A3 circulate in the apparatus where step c) occurs, is greater than 1.

Classes IPC  ?

• C01G 43/00 - Composés de l'uranium

Produits et services

Self-priming centrifugal pumps for special impellers consisting of a body attached to pipework and a detachable part used especially in irradiating, toxic, or chemically aggressive environments in industrial/in-plant atmosphere or clean atmosphere.

Abrégé

The invention relates to a device for supporting electrodes in an electrolysis installation, said support comprising a busbar having electrodes fastened thereto, said electrodes being disposed on either side of the busbar and extending vertically below said busbar, the busbar and said electrodes being designed to be immersed at least in part in an electrolyte that gives off one or more gaseous species of a corrosive nature. The device further comprises a protective element of carbon/carbon material placed under the busbar, the protective element being of length and width that are not less than the length and the width of the busbar.

Classes IPC  ?

• C25B 9/02 - Supports d'électrodes
• C25B 9/04 - Dispositifs pour l'alimentation en courant; Connexions d'électrodes; Connexions électriques inter-cellules
• C25B 9/06 - Cellules comportant des électrodes fixes de dimensions stables; Assemblages de leurs éléments de structure