DE1201321B - Process for the oxidation of plutonium (III) to plutonium (IV) in acidic solution - Google Patents
Process for the oxidation of plutonium (III) to plutonium (IV) in acidic solutionInfo
- Publication number
- DE1201321B DE1201321B DEC32537A DEC0032537A DE1201321B DE 1201321 B DE1201321 B DE 1201321B DE C32537 A DEC32537 A DE C32537A DE C0032537 A DEC0032537 A DE C0032537A DE 1201321 B DE1201321 B DE 1201321B
- Authority
- DE
- Germany
- Prior art keywords
- plutonium
- iii
- oxidation
- solution
- acidic solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 16
- 238000007254 oxidation reaction Methods 0.000 title claims description 11
- 230000003647 oxidation Effects 0.000 title claims description 10
- ZLYXMBXMECZBSN-UHFFFAOYSA-N [Pu+3] Chemical compound [Pu+3] ZLYXMBXMECZBSN-UHFFFAOYSA-N 0.000 title claims description 6
- 239000003929 acidic solution Substances 0.000 title claims description 6
- IYQHAABWBDVIEE-UHFFFAOYSA-N [Pu+4] Chemical compound [Pu+4] IYQHAABWBDVIEE-UHFFFAOYSA-N 0.000 title claims description 5
- 239000007789 gas Substances 0.000 claims description 8
- GQPLMRYTRLFLPF-UHFFFAOYSA-N nitrous oxide Inorganic materials [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 claims description 7
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 229910052778 Plutonium Inorganic materials 0.000 description 20
- OYEHPCDNVJXUIW-UHFFFAOYSA-N plutonium atom Chemical compound [Pu] OYEHPCDNVJXUIW-UHFFFAOYSA-N 0.000 description 20
- 239000000243 solution Substances 0.000 description 18
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 8
- 229910017604 nitric acid Inorganic materials 0.000 description 8
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical class [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- 150000001212 Plutonium Chemical class 0.000 description 2
- 229910052770 Uranium Inorganic materials 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- LUTSRLYCMSCGCS-BWOMAWGNSA-N [(3s,8r,9s,10r,13s)-10,13-dimethyl-17-oxo-1,2,3,4,7,8,9,11,12,16-decahydrocyclopenta[a]phenanthren-3-yl] acetate Chemical compound C([C@@H]12)C[C@]3(C)C(=O)CC=C3[C@@H]1CC=C1[C@]2(C)CC[C@H](OC(=O)C)C1 LUTSRLYCMSCGCS-BWOMAWGNSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- ZQPKENGPMDNVKK-UHFFFAOYSA-N nitric acid;plutonium Chemical compound [Pu].O[N+]([O-])=O ZQPKENGPMDNVKK-UHFFFAOYSA-N 0.000 description 1
- 150000002826 nitrites Chemical class 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-N sulfonic acid Chemical compound OS(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-N 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G99/00—Subject matter not provided for in other groups of this subclass
- C01G99/006—Compounds containing a metal not provided for elsewhere in this subclass, with or without oxygen or hydrogen, and containing two or more other elements
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/42—Reprocessing of irradiated fuel
- G21C19/44—Reprocessing of irradiated fuel of irradiated solid fuel
- G21C19/46—Aqueous processes, e.g. by using organic extraction means, including the regeneration of these means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Description
BUNDESREPUBLIK DEUTSCHLAND DEUTSCHES 4WIW> PATENTAMT Int. Cl.:FEDERAL REPUBLIC OF GERMANY GERMAN 4WIW> PATENTAMT Int. Cl .:
COIgCOIg
Deutsche Kl.: 12 η - 57/00 German class: 12 η - 57/00
Nummer: 1201321Number: 1201321
Aktenzeichen: C 32537IV a/12 ηFile number: C 32537IV a / 12 η
Anmeldetag: 1. April 1964Filing date: April 1, 1964
Auslegetag: 23. September 1965Opening day: September 23, 1965
Die Erfindung betrifft ein Verfahren zur Oxydation von Plutonium der Wertigkeitsstufe III zur Wertigkeitsstufe IV in saurer Lösung. Die Erfindung gestattet die kontinuierliche Durchführung der Oxydation von Plutoniumsalzen.The invention relates to a method for the oxidation of plutonium from valence level III to valence level IV in acidic solution. The invention allows the oxidation to be carried out continuously of plutonium salts.
Plutoniumsalze der Wertigkeitsstufe 4+ besitzen eine große Affinität für bestimmte organische Lösungsmittel, wie Tributylphosphat und tertiäre Amine. Man benutzt diese Eigenschaft insbesondere bei Verfahren zur Extraktion von Plutonium aus bestrahlten Kernbrennstoffen.Plutonium salts of valence level 4+ have a great affinity for certain organic solvents, such as tributyl phosphate and tertiary amines. One uses this property in particular in processes for the extraction of plutonium from irradiated nuclear fuel.
Die gewöhnlichen Verfahren zur Oxydation einer salpetersauren Lösung von Plutonium(III) zu Plutonium(IV) bestehen in der Zugabe genügender Mengen von Alkalinitriten.The common methods of oxidizing a nitric acid solution from plutonium (III) to plutonium (IV) consist in the addition of sufficient quantities of alkali nitrites.
Das beschriebene Verfahren bewirkt zwar eine quantitative Oxydation, hat jedoch den Nachteil, daß in die Lösung fremde Kationen, wie Natrium, Kalium, eingeführt werden, die unerwünschte Verunreinigungen sind, wenn man das Plutonium in sehr großer Reinheit gewinnen will.Although the process described causes a quantitative oxidation, it has the disadvantage that foreign cations, such as sodium, potassium, are introduced into the solution, the undesired impurities are if you want to extract the plutonium in very high purity.
Die Erfindung bezweckt ein Verfahren, das eine rasche und vollständige Oxydation des Plutoniums(III) zur Wertigkeitsstufe IV gewährleistet, jedoch nicht diese Nachteile aufweist.The invention aims at a process that enables rapid and complete oxidation of the plutonium (III) to level IV guaranteed, but does not have these disadvantages.
Dieses Verfahren zum Oxydieren von Plutonium in wäßriger saurer Lösung eines solchen Redoxpotentials, daß das Plutonium die Wertigkeitsstufe III hat, besteht im wesentlichen darin, in die Lösung nitrose Gase hineinperlen zu lassen.This method of oxidizing plutonium in an aqueous acidic solution of such a redox potential that the plutonium has the valence level III, consists essentially in the solution to let nitrous gases bubble into it.
Das erfindungsgemäße Verfahren läßt sich insbesondere auf salpetersaure Lösungen von Plutonium mit einem Gehalt an einem Reduktionsmittel, wie Eisen(II)-salzen, anwenden. Die nitrosen Gase können beispielsweise durch Einwirkung von Salpetersäure auf Formaldehyd in der Hitze oder durch Einwirkung von Salpetersäure auf metallisches Eisen oder Kupfer erhalten werden.The method according to the invention can be applied in particular to nitric acid solutions of plutonium with a content of a reducing agent such as ferrous salts. The nitrous gases can for example by the action of nitric acid on formaldehyde in the heat or by Exposure of nitric acid to metallic iron or copper can be obtained.
Ein besonderes Beispiel zur Durchführung des erfindungsgemäßen Verfahrens wird im folgenden beschrieben mit Bezug auf die Figur, die schematisch eine Vorrichtung zur Durchführung der Erfindung zeigt.A particular example for carrying out the method according to the invention is described below with reference to the figure, which schematically shows an apparatus for carrying out the invention shows.
Die Erfindung wird beschrieben in ihrer Anwendung auf eine salpetersaure Lösung von Plutonium, die bei der Extraktion von Plutonium aus einer organischen Lösung mit einem Gehalt an Plutonium und Uran gewonnen wurde.The invention is described in its application to a nitric acid solution of plutonium, those involved in the extraction of plutonium from an organic solution containing plutonium and Uranium was extracted.
In den bekannten Extraktionsverfahren für Plutonium aus einer organischen Phase, in der Plutonium und Uran jeweils in der Wertigkeitsstufe von mindestens IV vorhanden sind, um darin löslich zu sein,In the known extraction process for plutonium from an organic phase, in the plutonium and uranium are each present in the valence level of at least IV in order to be soluble therein,
Verfahren zur Oxydation von Plutonium(III) zu Plutonium(IV) in saurer LösungProcess for the oxidation of plutonium (III) to plutonium (IV) in acidic solution
Anmelder:Applicant:
Commissariat ä l'Energie Atomique, ParisCommissariat a l'Energie Atomique, Paris
Vertreter:Representative:
Dipl.-Chem. Dr. H. U. May, Patentanwalt,Dipl.-Chem. Dr. H. U. May, patent attorney,
München 2, Ottostr. 1 aMunich 2, Ottostr. 1 a
Als Erfinder benannt:Named as inventor:
Monique Bouzou,Monique Bouzou,
Andre Deroite,Andre Deroite,
Bagnols-sur-Ceze, Gard (Frankreich)Bagnols-sur-Ceze, Gard (France)
Beanspruchte Priorität:Claimed priority:
Frankreich vom 9. April 1963 (930 930)France 9 April 1963 (930 930)
reduziert man zunächst das Plutonium zur dreiwerti-one first reduces the plutonium to the three-valued
s5 gen Stufe, um es mittels einer salpetersauren wäßrigen Phase zu extrahieren, in der das Plutonium löslich ist. Die so erhaltene Lösung enthält Eisen(II)-salze (beispielsweise Eisen(II)-sulfat), die das Plutonium auf der Wertigkeitsstufe III stabilisieren. Auf dieser Verfahrensstufe kann es zur Durchführung der folgenden Maßnahmen notwendig sein, das Plutonium von der Wertigkeit III zur Wertigkeit IV zu oxydieren, und das erfindungsgemäße Verfahren findet hierbei eine besonders vorteilhafte Anwendung. Die Erfindung besteht darin, nitrose Gase in die Lösung perlen zu lassen. Sie kann beispielsweise in der Vorrichtung durchgeführt werden, die in der Figur dargestellt ist. Diese Vorrichtung besteht aus einer Glaskolonne 1, die mit Raschigringen 2 gefüllt ist, um die Berührung Flüssigkeit/Gas zu verbessern. Der Umlauf der Medien erfolgt im Gegenstrom. Die nitrosen Gase treten am unteren Ende der Kolonne 1 durch den Einlaß 3 ein und bewegen sich infolge einer hydraulischen Sperre 5, die aus der Lösung des zur Wertigkeit IV oxydierten Plutoniums besteht, in der Kolonne 1 von unten nach oben. Die zu behandelnde salpetersaure Plutoniumlösung wird am Kopf der Kolonne 1 durch den Einlaß 6 eingeführt und bewegt sich von oben nach unten.s5 gen level to it by means of an aqueous nitric acid Extract phase in which the plutonium is soluble. The solution obtained in this way contains iron (II) salts (for example iron (II) sulfate), which stabilize the plutonium at valence level III. on At this stage of the process it may be necessary to carry out the following measures, the plutonium to oxidize from valence III to valence IV, and the process according to the invention finds a particularly advantageous application here. The invention consists of nitrous gases in the Let solution pearl. It can be carried out, for example, in the device that is included in the Figure is shown. This device consists of a glass column 1 filled with Raschig rings 2 is to improve the liquid / gas contact. The media circulate in countercurrent. The nitrous gases enter the lower end of column 1 through inlet 3 and move as a result of a hydraulic lock 5, which results from the solution of the plutonium oxidized to the value IV exists, in column 1 from bottom to top. The nitric acid plutonium solution to be treated is introduced at the top of the column 1 through the inlet 6 and moves from top to bottom.
Die überschüssigen nitrosen Gase entweichen beim Auslaß 1, während die oxydierte Plutoniumlösung am Auslaß 8 abgezogen wird.The excess nitrous gases escape at outlet 1, while the oxidized plutonium solution is drawn off at outlet 8.
509 688/304509 688/304
Die Oxydationsreaktion kann in folgender Weise wiedergegeben werden:The oxidation reaction can be represented in the following way:
NO + NO2 + O2 + (NO3)sPu ->■ (NOa)4Pu + NO2 NO + NO 2 + O 2 + (NO 3 ) s Pu -> ■ (NO a ) 4 Pu + NO 2
Es wurden nach diesem Verfahren zu wiederholten Malen Oxydationen durchgeführt, und die Oxydation von Plutonium(III) zu Plutonium(IV) war stets vollständig.Oxidations were carried out repeatedly according to this procedure, and the Oxidation of plutonium (III) to plutonium (IV) was always complete.
Der Nachweis des Übergangs des gesamten Plutoniums von der Wertigkeit III zur Wertigkeit IV ergab sich aus der Farbänderung im Verlauf des Verfahrens: Die anfänglich blaue Lösung wurde braun. Ein von der so behandelten Lösung gemessenes Absorptionsspektrum bestätigte, daß das gesamte Plutonium in der Wertigkeit IV stabilisiert war.Evidence of the transition of the entire plutonium from grade III to grade IV resulted from the color change in the course of the process: the initially blue solution turned brown. A The absorption spectrum measured from the thus treated solution confirmed that all of the plutonium was stabilized in the value IV.
Im folgenden ist zur Erläuterung ein Zahlenbeispiel gegeben.A numerical example is given below for explanation.
In eine Kolonne von 500 mm Höhe und 50 mm Durchmesser wurden 4 l/Stunde einer salpetersauren Lösung von Pu3+ mit einer freien Agidität von 1,1 n-HNO3 und einem Gehalt von 20 g/l Pu3+ und 5 g/l Fe2+ gegeben. Diese Lösung wurde durch 150 l/Stunde nitrose Gase vollständig oxydiert.4 l / hour of a nitric acid solution of Pu 3+ with a free agidity of 1.1 n-HNO 3 and a content of 20 g / l Pu 3+ and 5 g / l Fe 2+ given. This solution was completely oxidized by nitrous gases at 150 l / hour.
Ein an der am Auslaß 8 abgenommenen Lösung gemessenes Absorptionsspektrum zeigte, daß das gesamte Plutonium auf der Wertigkeitsstufe IV stabilisiert war.An absorption spectrum measured on the solution taken off at outlet 8 showed that the entire Plutonium was stabilized at valence level IV.
Obgleich die Erfindung nur in ihrer Anwendung auf eine salpetersaure Lösung beschrieben wurde, kann sie selbstverständlich anderen Fällen angepaßt werden, insbesondere schwefelsauren und sulfosalpetersauren Lösungen.Although the invention has only been described in its application to a nitric acid solution, it can of course be adapted to other cases, in particular sulphate and sulphonic acid Solutions.
Claims (2)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR930930A FR1361458A (en) | 1963-04-09 | 1963-04-09 | Process for the oxidation of plutonium in acidic solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1201321B true DE1201321B (en) | 1965-09-23 |
Family
ID=8801238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEC32537A Pending DE1201321B (en) | 1963-04-09 | 1964-04-01 | Process for the oxidation of plutonium (III) to plutonium (IV) in acidic solution |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE646231A (en) |
| DE (1) | DE1201321B (en) |
| FR (1) | FR1361458A (en) |
| GB (1) | GB1052895A (en) |
| LU (1) | LU45792A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103896345A (en) * | 2014-02-27 | 2014-07-02 | 中国原子能科学研究院 | Method and device for adjusting plutonium valence state by NOX oxidation |
-
0
- GB GB1052895D patent/GB1052895A/en not_active Expired
-
1963
- 1963-04-09 FR FR930930A patent/FR1361458A/en not_active Expired
-
1964
- 1964-04-01 LU LU45792D patent/LU45792A1/xx unknown
- 1964-04-01 DE DEC32537A patent/DE1201321B/en active Pending
- 1964-04-07 BE BE646231A patent/BE646231A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| LU45792A1 (en) | 1964-06-10 |
| GB1052895A (en) | 1900-01-01 |
| FR1361458A (en) | 1964-05-22 |
| BE646231A (en) | 1964-07-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE2210106A1 (en) | Process for the selective extraction of metalhones from aqueous solutions | |
| DE2404019C3 (en) | Process for the recovery of mercury from metallurgical exhaust gases | |
| DE1114794B (en) | Process for the extraction of uranium by the alkaline treatment of uranium ores | |
| DE1215669B (en) | Process for processing irradiated nuclear reactor fuel | |
| DE1194582B (en) | Process for pre-decontamination of nuclear fuel to be processed | |
| DE2855821A1 (en) | METHOD OF RECOVERING PALLADIUM AND TECHNETIUM | |
| DE3028024A1 (en) | METHOD FOR SEPARATING PLUTONIUM FROM AQUEOUS, SULFURIC ACID SOLUTIONS | |
| DE3504743A1 (en) | IMPROVED PROCESS FOR TREATING NUCLEAR FUEL | |
| DE2363537A1 (en) | METHOD FOR SELECTIVE BACK EXTRACTION OF PLUTONIUM FROM ORGANIC SOLVENTS | |
| DE1592541A1 (en) | Liquid-liquid extraction process for separating plutonium from uranium | |
| DE1201321B (en) | Process for the oxidation of plutonium (III) to plutonium (IV) in acidic solution | |
| DE2302563C3 (en) | Process for removing monovalent inorganic acids from an aqueous solution | |
| DE2814765C2 (en) | Process for the reduction of plutonium (IV) to plutonium (III) | |
| DE1467313A1 (en) | Process for the separation of uranium and plutonium | |
| DE1192634B (en) | Process for dissolving uranium in nitric acid | |
| DE1118769B (en) | Process for the extraction of uranium in the form of its compounds | |
| EP0589076B1 (en) | Process for the preparation of UO2 or U/PO2 powder | |
| DE2601912C3 (en) | Process for the processing of oxidic uranium / thorium waste | |
| DE2057760A1 (en) | Process for the improved separation of fission products in the aqueous reprocessing of spent nuclear fuel | |
| DE521648C (en) | Process for removing hydrogen sulphide from carbon distillation gases | |
| AT215961B (en) | Process for the reduction of plutonium, in particular in connection with the separation of plutonium from uranium | |
| DE1946716C3 (en) | Process for converting single phase uranium plutonium monocarbide contained in irradiated nuclear fuel into (UPu) O2 | |
| DE3101702A1 (en) | METHOD FOR RECOVERING URANIUM FROM WET METHOD PHOSPHORIC ACID | |
| DE1592416A1 (en) | Process for the reduction of plutonium | |
| DE405924C (en) | Process for breaking up chrome iron stone |