WO1996025746A1 - PROCESS FOR PRODUCING (U, Pu)O2 MIXED OXIDE PELLETS - Google Patents

PROCESS FOR PRODUCING (U, Pu)O2 MIXED OXIDE PELLETS Download PDF

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Publication number
WO1996025746A1
WO1996025746A1 PCT/DE1996/000150 DE9600150W WO9625746A1 WO 1996025746 A1 WO1996025746 A1 WO 1996025746A1 DE 9600150 W DE9600150 W DE 9600150W WO 9625746 A1 WO9625746 A1 WO 9625746A1
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Prior art keywords
mixed oxide
group
grinding
substances
grist
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PCT/DE1996/000150
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German (de)
French (fr)
Inventor
Horst Keutz
Wilhelm Königs
Jürgen KRELLMANN
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Siemens Aktiengesellschaft
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Publication of WO1996025746A1 publication Critical patent/WO1996025746A1/en

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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/42—Selection of substances for use as reactor fuel
    • G21C3/58—Solid reactor fuel Pellets made of fissile material
    • G21C3/62—Ceramic fuel
    • G21C3/623—Oxide fuels
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/51—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on compounds of actinides
    • 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

Definitions

  • the invention relates to a method for producing
  • the granulate resulting from the second granulation step is pressed into compacts, which are finally pressed into the
  • Mixed oxide tablets are sintered. These mixed oxide tablets are nuclear fuel tablets with which fuel rods for nuclear reactor fuel elements are filled. If both powders of the regrind are unsintered, the plutonium oxide content of these nuclear fuel tablets is at least 99% by weight Pu-rel. dissolved in nitric acid (without the addition of hydrofluoric acid). The nuclear fuel tablets can therefore be easily reprocessed in a nuclear reactor after burning.
  • the invention is based on the object of developing the known method in such a way that the mixed oxide tablets obtained after sintering have a particularly high sintered density.
  • a particularly high sintered density has the effect, in particular, that the mixed oxide tablets are dimensionally stable during their use in a nuclear reactor. They also have
  • the grain size of the ground material is determined by sieve analysis with a test sieve according to DIN 4188 (Oct. 1977) and the average grain size d5Q.3 of the powder according to DIN 66141 (Feb. 1974).
  • the ground material can also be broken from mixed oxide scrap which is produced from sintered nuclear fuel tablets (U , Pu) ⁇ 2 mixed oxide is obtained as rejects or grinding abrasion and its plutonium oxide content in pure nitric acid (without the addition of hydrofluoric acid) is not more than 97% by weight Pu-rel. is soluble soluble.
  • the plutonium oxide content of (U / Pu) O2 mixed oxide tablets obtained from such rejects or grinding abrasion using the method according to the invention is more than 99% by weight Pu-rel. dissolved in pure nitric acid (without addition of hydrofluoric acid) soluble.
  • Claims 2 to 12 are directed to advantageous further developments of the method according to claim 1.
  • the drawing shows a flow diagram for a method according to the invention.
  • the starting material is (U, Pu) ⁇ 2 mixed oxide sintered body, which is return material from a (U, Pu) 02 mixed oxide tablet production.
  • a first batch 1 of the return material has a different plutonium content than a second batch 2 of this return material. Both batches were made by mixing unsintered UO2 and PUO2 powder and then
  • Both batches are broken separately in a jaw or roller crusher into sintered bodies, the grain size of which is ⁇ 3 mm.
  • the sintered bodies obtained by breaking are then separated from one another for approximately 30 minutes to form a homogeneous one Ground material with a grain size ⁇ 160 ⁇ m pre-ground in an attritor or ball mill.
  • 0.4% by weight of oxalic acid diamide or 0.3% by weight of azodicarboxylic acid diamide is added to the powder as a pore former.
  • the mixture is then granulated in a closed, rotating drum to form a granulate with an average diameter d5Q »3 in the range from 10 ⁇ m to 600 ⁇ m, preferably from 300 ⁇ m.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

Sintered (U, Pu)O2 mixed oxide pellets with a particularly high sintering density are produced by grinding, in particular ball-grinding, sintered (U, Pu)O2 mixed oxide bodies having a grain size « 3 mm. The ground material is pulverized to form a powder having an average grain size of d50,3 « 3 νm. The powder is then granulated and compressed into compacts which are sintered to form the mixed oxide pellets.

Description

Beschreibung description
Verfahren zum Herstellen von (U,Pu)Ü2-MischoxidtablettenProcess for the preparation of (U, Pu) Ü2 mixed oxide tablets
Die Erfindung betrifft ein Verfahren zum Herstellen vonThe invention relates to a method for producing
(U,PU.O2-Mischoxidtabletten entsprechend dem Oberbegriff des Patentanspruchs 1.(U, PU.O2 mixed oxide tablets according to the preamble of claim 1.
Ein derartiges Verfahren ist aus der deutschen Offenlegungs- schrift 27 41 820 bekannt. Als Mahlgut wird bei diesem Ver¬ fahren eine Mischung aus UO2- und Puθ2~Pulver verwendet. Es sind zwei Granulierschritte vorgesehen, denen jeweils ein Pressen des Granulierguts unmittelbar vorangeht. Das sich durch den ersten Granulierschritt ergebende Granulat wird vor dem dem zweiten Granulierschritt vorgeschalteten Pressen zu¬ sätzlich gepreßt und gesintert und anschließend kugelgemah¬ len.Such a method is known from German Offenlegungsschrift 27 41 820. In this process, a mixture of UO2 and PuO2 powder is used as regrind. Two granulating steps are provided, each of which is immediately preceded by pressing the granulated material. The granulate resulting from the first granulation step is additionally pressed and sintered before the pressing upstream of the second granulation step and then ball-milled.
Das sich durch den zweiten Granulierschritt ergebende Granu- lat wird zu Preßkörpern gepreßt, die schließlich zu denThe granulate resulting from the second granulation step is pressed into compacts, which are finally pressed into the
Mischoxidtabletten gesintert werden. Diese Mischoxidtabletten stellen Kernbrennstofftabletten dar, mit denen Brennstäbe für Kernreaktorbrennelemente gefüllt werden. Sind beide Pulver des Mahlguts ungesintert, so ist der Plutoniumoxidanteil die- ser Kernbrennstofftabletten mindestens zu 99 Gew-.% Pu-rel. gelöst in Salpetersäure (ohne Flußsäurebeimischung) löslich. Die Kernbrennstofftabletten können deshalb nach dem Abbrennen in einem Kernreaktor leicht wieder aufgearbeitet werden.Mixed oxide tablets are sintered. These mixed oxide tablets are nuclear fuel tablets with which fuel rods for nuclear reactor fuel elements are filled. If both powders of the regrind are unsintered, the plutonium oxide content of these nuclear fuel tablets is at least 99% by weight Pu-rel. dissolved in nitric acid (without the addition of hydrofluoric acid). The nuclear fuel tablets can therefore be easily reprocessed in a nuclear reactor after burning.
Der Erfindung liegt die Aufgabe zugrunde, das bekannte Ver¬ fahren so weiterzubilden, daß die nach dem Sintern erzielten Mischoxidtabletten eine besonders hohe Sinterdichte haben. Eine solche besonders hohe Sinterdichte bewirkt insbesondere, daß die Mischoxidtabletten während ihres Einsatzes in einem Kernreaktor dimensionsstabil sind. Außerdem haben dieseThe invention is based on the object of developing the known method in such a way that the mixed oxide tablets obtained after sintering have a particularly high sintered density. Such a particularly high sintered density has the effect, in particular, that the mixed oxide tablets are dimensionally stable during their use in a nuclear reactor. They also have
Mischoxidtabletten ein hohes Kernbrennstoffinventar, ferner setzen sie wenig Spaltgas frei. Zur Lösung dieser Aufgabe ist das eingangs erwähnte Verfahren entsprechend dem kennzeichnenden Teil des Patentanspruchs 1 ausgebildet.Mixed oxide tablets have a high nuclear fuel inventory, and they also release little fission gas. To achieve this object, the method mentioned at the outset is designed in accordance with the characterizing part of patent claim 1.
Die Korngröße des Mahlguts wird durch Siebanalyse mit einem Prüfsieb entsprechend DIN 4188 (Okt. 1977) und die mittlere Korngröße d5Q.3 des Pulvers nach DIN 66141 (Feb. 1974) be¬ stimmt.The grain size of the ground material is determined by sieve analysis with a test sieve according to DIN 4188 (Oct. 1977) and the average grain size d5Q.3 of the powder according to DIN 66141 (Feb. 1974).
Mit dem erfindungsgemäßen Verfahren werden nicht nur gesin¬ terte und in reiner Salpetersäure (ohne Flußsäurebeimischung) gut lösliche Mischoxidtabletten mit besonders großer Sinter¬ dichte erzielt, sondern das Mahlgut kann auch aus Mischoxid- schrott gebrochen sein, der beim Herstellen von gesinterten Kernbrennstofftabletten aus (U, Pu)θ2-Mischoxid als Ausschuß oder Schleifabtrag anfällt und dessen Plutoniumoxidanteil in reiner Salpetersäure (ohne Flußsäurebeimischung) zu nicht mehr als 97 Gew.-% Pu-rel. gelöst löslich ist. Der Plutoniu- moxidanteil von aus solchem Ausschuß oder Schleifabtrag mit dem erfindungsgemäßen Verfahren gewonnenen (U/Pu)O2-Misch¬ oxidtabletten ist zu mehr als 99 Gew.-% Pu-rel. gelöst in reiner Salpetersäure (ohne Flußsäurebeimischung) löslich.With the process according to the invention, not only are sintered mixed oxide tablets with a particularly high sintered density soluble in pure nitric acid (without the addition of hydrofluoric acid), but the ground material can also be broken from mixed oxide scrap which is produced from sintered nuclear fuel tablets (U , Pu) θ2 mixed oxide is obtained as rejects or grinding abrasion and its plutonium oxide content in pure nitric acid (without the addition of hydrofluoric acid) is not more than 97% by weight Pu-rel. is soluble soluble. The plutonium oxide content of (U / Pu) O2 mixed oxide tablets obtained from such rejects or grinding abrasion using the method according to the invention is more than 99% by weight Pu-rel. dissolved in pure nitric acid (without addition of hydrofluoric acid) soluble.
Ferner kann ein zweiter Granulierschritt mit vorgeschaltetem Pressen, Sintern, Kugelmahlen und erneutem Pressen des Granu¬ lierguts vermieden werden.Furthermore, a second pelletizing step with upstream pressing, sintering, ball milling and again pressing the pelletized material can be avoided.
Die Patentansprüche 2 bisl2 sind auf vorteilhafte Weiterbil- düngen des Verfahrens nach Patentanspruch 1 gerichtet.Claims 2 to 12 are directed to advantageous further developments of the method according to claim 1.
Die Weiterbildungen nach Patentanspruch 2 , 3 und 4 ermögli¬ chen ein Einstellen der Spaltstoffanreicherung in den gewon¬ nenen Mischoxidtabletten. Die Weiterbildung nach Patentan- spruch 4 ermöglicht auch eine besonders kostengünstige Rück¬ führung größerer Mengen von gesintertem Mischoxidschrott. Die Weiterbildungen nach den Patentansprüchen 5 bis 8 verhin¬ dern ein Anbacken des Mahlguts am Mahlgefäß und an den Mahl- körpern (Mahlkugeln) .The developments according to patent claims 2, 3 and 4 make it possible to adjust the enrichment of fissile material in the mixed oxide tablets obtained. The further development according to patent claim 4 also enables a particularly cost-effective return of larger amounts of sintered mixed oxide scrap. The further developments according to patent claims 5 to 8 prevent the material to be caked on the grinding vessel and on the grinding media (grinding balls).
Aus EP-A-0 036 214 ist zwar bekannt, beim Herstellen von ges¬ interten Mischoxid-Kernbrennstofftabletten ein Gemisch aus UO2- und Puθ2-Pulver zu mahlen und vor dem Granulieren diesem gemahlenen Gemisch feine Agglomerationskeime aus gesintertem Uran-Plutonium-Mischoxid hinzuzufügen, das Rücklaufpulver aus vorangehenden Fertigungen von gesinterten Mischoxid-Kern¬ brennstofftabletten ist. Die beiden Pulver für das Pulverge¬ misch können nur ungesintert sein. Das Rücklaufpulver wird dem gemahlenen Pulvergemisch jedoch nur in sehr geringen Men¬ gen zugesetzt.From EP-A-0 036 214 it is known to grind a mixture of UO2 and PuO2 powder when producing sintered mixed oxide nuclear fuel tablets and to add fine agglomeration nuclei from sintered uranium-plutonium mixed oxide to this ground mixture before granulation, the return powder from previous productions of sintered mixed oxide core fuel tablets. The two powders for the powder mixture can only be unsintered. However, the reflux powder is added to the ground powder mixture only in very small amounts.
Die Erfindung und ihre Vorteile seien anhand der Zeichnung an Ausführungsbeispielen näher erläutert:The invention and its advantages are explained in more detail with reference to the drawing using exemplary embodiments:
Die Zeichnung zeigt ein Fließbild zu einem erfindungsgemäßen Verfahren. Ausgangsmaterial sind (U, Pu)θ2-Mischoxidsinterkör- per, die Rücklaufmaterial aus einer (U,Pu)02-Mischoxidtablet- tenfertigung sind. Eine erste Charge 1 des Rücklaufmaterials hat einen anderen Plutoniumgehalt als eine zweite Charge 2 dieses Rücklaufmaterials. Beide Chargen wurden durch Mischen von ungesintertem UO2- und PUO2-Pulver und anschließendesThe drawing shows a flow diagram for a method according to the invention. The starting material is (U, Pu) θ2 mixed oxide sintered body, which is return material from a (U, Pu) 02 mixed oxide tablet production. A first batch 1 of the return material has a different plutonium content than a second batch 2 of this return material. Both batches were made by mixing unsintered UO2 and PUO2 powder and then
Pressen und Sintern gewonnen, ohne daß die Mischung gemahlen wurde. Die Löslichkeit des Plutoniumoxidanteils in beiden Chargen in reiner Salpetersäure (ohne Flußsäurebeimischung) beträgt deshalb nur 80 Gew.-% Pu rel . gelöst.Pressing and sintering were obtained without the mixture being ground. The solubility of the plutonium oxide content in both batches in pure nitric acid (without the addition of hydrofluoric acid) is therefore only 80% by weight Pu rel. solved.
Beide Chargen werden gesondert in einem Backen- oder Walzen¬ brecher zu Sinterkörpern gebrochen, deren Korngröße < 3 mm ist.Both batches are broken separately in a jaw or roller crusher into sintered bodies, the grain size of which is <3 mm.
Anschließend werden die durch Brechen gewonnenen Sinterkörper ca. 30 Minuten lang gesondert voneinander zu einem homogenen Mahlgut mit einer Korngröße ≤ 160μm in einer Attritor- oder Kugelmühle vorgemahlen.The sintered bodies obtained by breaking are then separated from one another for approximately 30 minutes to form a homogeneous one Ground material with a grain size ≤ 160μm pre-ground in an attritor or ball mill.
Nach dem Vormahlen werden beide Chargen getrennt voneinander auf U-Gehalt, Pu-Gehalt und Gehalt an Pu-Isotopen analysiert.After pre-grinding, the two batches are analyzed separately for U content, Pu content and Pu isotope content.
Entsprechend dem Analysenergebnis und dem angestrebten Pu/ (Pu+U) -Verhältnis wird Material aus beiden Chargen in eine Kugelmühle eindosiert und zusammen mit 0.6 Gew.-% Zinkstearat 24 Stunden lang feinstgemahlen. Das Mahlgut ist dann ein Pul¬ ver mit einer mittleren Korngröße d5Q 3=1.35μm. Anstelle der Kugelmühle kann auch eine Attritormühle verwendet werden, in der eine Mahldauer von 1 Stunde ausreicht.According to the analysis result and the desired Pu / (Pu + U) ratio, material from both batches is metered into a ball mill and finely ground together with 0.6% by weight zinc stearate for 24 hours. The millbase is then a powder with an average grain size d5 Q 3 = 1.35 μm. Instead of the ball mill, an attritor mill can be used, in which a grinding time of 1 hour is sufficient.
Dem Pulver wird 0.4 Gew.-% Oxalsäurediamid oder 0.3 Gew.-% Azodicarbonsäurediamid als Porenbildner beigemischt. Sodann wird das Gemisch in einer geschlossenen, sich drehenden Trom¬ mel zu einem Granulat mit einem mittleren Durchmesser d5Q»3 im Bereich von lOμm bis 600μm, vorzugsweise von 300μm, auf- baugranuliert.0.4% by weight of oxalic acid diamide or 0.3% by weight of azodicarboxylic acid diamide is added to the powder as a pore former. The mixture is then granulated in a closed, rotating drum to form a granulate with an average diameter d5Q »3 in the range from 10 μm to 600 μm, preferably from 300 μm.
Hierauf wird dem Granulat 0.1 Gew.-% Zinkstearat oder 0.1 Gew.-% Aluminiumstearat als Preßhilfsmittel beigemischt. So¬ dann wird das Granulat in einer Presse zu Preßkörpern mit ei- ner Preßdichte von 8.5g/cm3 gepreßt. Diese Preßkörper werden schließlich in einem Sinterofen in einer Argon-Wasserstoff- Atmosphäre bei 1720°C sechs Stunden lang gesintert. Die ge¬ wonnenen Tabletten aus (U,Pu)θ2-Mischoxid-Sinterkörpern haben eine Sinterdichte von 10,45g/cτn3. Die Löslichkeit ihres Plu- toniumoxidanteils in reiner Salpetersäure (ohne beigemischte Flußsäure) beträgt 99.95 Gew.-% Pu-rel. gelöst.Then 0.1% by weight of zinc stearate or 0.1% by weight of aluminum stearate is added to the granules as a pressing aid. Then the granules are pressed in a press to form compacts with a compaction density of 8.5 g / cm 3 . These compacts are finally sintered in a sintering furnace in an argon-hydrogen atmosphere at 1720 ° C for six hours. The tablets obtained from (U, Pu) θ2 mixed oxide sintered bodies have a sintered density of 10.45 g / cm 3 . The solubility of their plutonium oxide content in pure nitric acid (without added hydrofluoric acid) is 99.95% by weight Pu-rel. solved.
Wird anstelle des Rücklaufmaterials 2 im Fließbild ungesin¬ tertes Puθ2-Pulver mit einer Partikelgröße < 7.5μm dem Mahl- gut der Charge 1 zugemischt und die Mischung zusammen mit 0.2 Gew.-% Aluminiumstearat zu einem Pulver mit einer mittleren Korngröße dso
Figure imgf000006_0001
feinstgemahlen, so erhält man nach dem Granulieren des Mahlguts, Pressen des Granulats zu Preßkör¬ pern und Sintern dieser Preßkörper entsprechend dem obigen Ausführungsbeispiel (U,Pu)θ2-Mischoxidtabletten mit einer Sinterdichte von 10.5g/cm3. Die Löslichkeit des Plutoniumoxi¬ danteils dieser Mischoxidtabletten in reiner Salpetersäure (ohne Flußsäurebeimischung) beträgt 99.7 Gew.-% Pu-rel. ge¬ löst. If, instead of the return material 2, unsintered PuO 2 powder with a particle size <7.5 μm is mixed into the millbase of batch 1 in the flow diagram and the mixture together with 0.2% by weight aluminum stearate to a powder with an average grain size dso
Figure imgf000006_0001
finely ground, you get after the Granulating the millbase, pressing the granules to form compacts and sintering these compacts in accordance with the above exemplary embodiment (U, Pu) θ2 mixed oxide tablets with a sintered density of 10.5 g / cm 3 . The solubility of the plutonium oxide portion of these mixed oxide tablets in pure nitric acid (without addition of hydrofluoric acid) is 99.7% by weight of Pu-rel. ge solved.

Claims

Patentansprüche claims
1. Verfahren zum Herstellen von (U, Pu)Ü2-Mischoxidtabletten durch Mahlen, insbesondere Kugelmahlen von Uran- und Plutoni- umoxid enthaltendem Mahlgut, das anschließend granuliert und zu Preßkörpern gepreßt wird, die schließlich zu den Mischoxidtabletten gesintert werden, d a d u r c h g e k e n n z e i c h n e t , daß als Mahlgut Sinterkörper aus (U, Pu)θ2-Mischoxid eingesetzt wer- den, die eine Korngröße < 3 mm haben, und daß das Mahlgut zu Pulver mit einer mittleren Korngröße dso 3 <3μm feinst gemahlen wird.1. A process for the preparation of (U, Pu) Ü2 mixed oxide tablets by grinding, in particular ball milling of grist containing uranium and plutonium oxide, which is then granulated and pressed to form compacts which are finally sintered into the mixed oxide tablets, characterized in that as Grist sintered bodies made of (U, Pu) θ2 mixed oxide are used, which have a grain size <3 mm and that the grist is finely ground to powder with an average grain size dso 3 <3μm.
2. Verfahren nach Anspruch l, d a d u r c h g e k e n n z e i c h n e t , daß Mahl¬ gut verwendet wird, das mindestens einen der Stoffe aus der Stoffgruppe ungesintertes UO2 und ungesintertes Puθ2 enthält, mit einem Gesamtanteil der Stoffe aus dieser Stoffgruppe von höchstens 40 Gew.-%.2. The method of claim 1, d a d u r c h g e k e n n z e i c h n e t that grind is used that contains at least one of the substances from the group of unsintered UO2 and unsintered PuO2, with a total proportion of the substances from this group of substances of at most 40 wt .-%.
3. Verfahren nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t , daß Mahl¬ gut verwendet wird mit einem Gesamtanteil der Stoffe der Stoffgruppe von höchstens 15 Gew.-%.3. The method of claim 2, d a d u r c h g e k e n n z e i c h n e t that grind is used with a total proportion of the substances of the group of substances of at most 15 wt .-%.
4. Verfahren nach Anspruch 3, d a d u r c h g e k e n n z e i c h n e t , daß Mahl¬ gut verwendet wird, das keinen der Stoffe der Stoffgruppe enthält.4. The method of claim 3, d a d u r c h g e k e n n z e i c h n e t that grind is used that does not contain any of the substances of the group.
5. Verfahren nach Anspruch l, d a d u r c h g e k e n n z e i c h n e t , daß dem5. The method of claim l, d a d u r c h g e k e n n z e i c h n e t that the
Mahlgut ein Mahlhilfsmittel zugesetzt wird.A grinding aid is added to the grist.
6. Verfahren nach Anspruch 5, d a d u r c h g e k e n n z e i c h n e t , daß als Mahlhilfsmittel mindestens eine der chemischen Verbindungen aus der Verbindungsgruppe Stearate, Polyalkohole und Amine verwendet wird.6. The method according to claim 5, characterized in that at least one of the chemical compounds as grinding aid from the compound group stearates, polyalcohols and amines is used.
7. Verfahren nach Anspruch 6, d a d u r c h g e k e n n z e i c h n e t , daß als Mahlhilfsmittel mindestens eine chemische Verbindung aus der Verbindungsgruppe Zinkstearat,Aluminiumstearat und Propandiol verwendet wird.7. The method of claim 6, d a d u r c h g e k e n n z e i c h n e t that at least one chemical compound from the group of compounds zinc stearate, aluminum stearate and propanediol is used as grinding aids.
8. Verfahren nach Anspruch 5, d a d u r c h g e k e n n z e i c h n e t , daß dem8. The method of claim 5, d a d u r c h g e k e n n z e i c h n e t that the
Mahlgut 0.1 bis 1.5 Gew.-% Mahlhilfsmittel zugesetzt wird.Grist 0.1 to 1.5 wt .-% grinding aid is added.
9. Verfahren nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß dem durch Feinstmahlen gewonnenem Pulver ein Porenbildner zuge¬ setzt wird.9. The method of claim 1, d a d u r c h g e k e n n z e i c h n e t that a pore former is added to the powder obtained by finely grinding.
10. Verfahren nach Anspruch 9, d a d u r c h g e k e n n z e i c h n e t , daß als Porenbildner mindestens eine chemische Verbindung aus der Verbindungsgruppe Oxalsäurediamid und Azodicarbonsäurediamid verwendet wird.10. The method of claim 9, d a d u r c h g e k e n n z e i c h n e t that at least one chemical compound from the connecting group oxalic acid diamide and azodicarboxylic acid diamide is used as the pore former.
11. Verfahren nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß dem granulierten Pulver ein Preßhilfsmittel zugesetzt wird.11. The method according to claim 1, d a d u r c h g e k e n n z e i c h n e t that a pressing aid is added to the granulated powder.
12. Verfahren nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß als Preßhilfsmittel Zinkstearat und/oder Aluminiumstearat verwen¬ det wird. 12. The method of claim 1, d a d u r c h g e k e n n z e i c h n e t that zinc stearate and / or aluminum stearate is used as a pressing aid.
PCT/DE1996/000150 1995-02-14 1996-02-01 PROCESS FOR PRODUCING (U, Pu)O2 MIXED OXIDE PELLETS WO1996025746A1 (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
GB2320800A (en) * 1996-12-27 1998-07-01 Doryokuro Kakunenryo Nuclear fuel pellets

Citations (6)

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GB910700A (en) * 1958-03-20 1962-11-14 Atomic Energy Authority Uk Improvements in or relating to densification and granulation of uranium dioxide
FR2049034A1 (en) * 1969-06-27 1971-03-26 Commissariat Energie Atomique Ceramic fuels of low apparent density
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GB2004256A (en) * 1977-09-16 1979-03-28 Alkem Gmbh Process for the production of uo2/puo2 nuclear fuels
EP0036214A2 (en) * 1980-03-19 1981-09-23 Alkem Gmbh Process for making mixed oxide nuclear fuel pellets soluble in nitric acid
FR2622343A1 (en) * 1987-10-26 1989-04-28 Commissariat Energie Atomique Process for the manufacture of nuclear fuel pellets based on mixed oxide (U,Pu)O2

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB910700A (en) * 1958-03-20 1962-11-14 Atomic Energy Authority Uk Improvements in or relating to densification and granulation of uranium dioxide
FR2049034A1 (en) * 1969-06-27 1971-03-26 Commissariat Energie Atomique Ceramic fuels of low apparent density
FR2148174A1 (en) * 1971-08-02 1973-03-16 North American Rockwell
GB2004256A (en) * 1977-09-16 1979-03-28 Alkem Gmbh Process for the production of uo2/puo2 nuclear fuels
EP0036214A2 (en) * 1980-03-19 1981-09-23 Alkem Gmbh Process for making mixed oxide nuclear fuel pellets soluble in nitric acid
FR2622343A1 (en) * 1987-10-26 1989-04-28 Commissariat Energie Atomique Process for the manufacture of nuclear fuel pellets based on mixed oxide (U,Pu)O2

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2320800A (en) * 1996-12-27 1998-07-01 Doryokuro Kakunenryo Nuclear fuel pellets
GB2320800B (en) * 1996-12-27 2001-02-07 Doryokuro Kakunenryo Method of manufacturing nuclear fuel pellets

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