EP0483139B1 - Heissverpressen von teilchenmaterial - Google Patents

Heissverpressen von teilchenmaterial Download PDF

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Publication number
EP0483139B1
EP0483139B1 EP89911001A EP89911001A EP0483139B1 EP 0483139 B1 EP0483139 B1 EP 0483139B1 EP 89911001 A EP89911001 A EP 89911001A EP 89911001 A EP89911001 A EP 89911001A EP 0483139 B1 EP0483139 B1 EP 0483139B1
Authority
EP
European Patent Office
Prior art keywords
container
portions
radially inwardly
side wall
reduced diameter
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.)
Expired - Lifetime
Application number
EP89911001A
Other languages
English (en)
French (fr)
Other versions
EP0483139A1 (de
EP0483139A4 (de
Inventor
Eric John Ramm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Australian Nuclear Science and Technology Organization
Original Assignee
Australian Nuclear Science and Technology Organization
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Australian Nuclear Science and Technology Organization filed Critical Australian Nuclear Science and Technology Organization
Publication of EP0483139A4 publication Critical patent/EP0483139A4/de
Publication of EP0483139A1 publication Critical patent/EP0483139A1/de
Application granted granted Critical
Publication of EP0483139B1 publication Critical patent/EP0483139B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/28—Treating solids
    • G21F9/34—Disposal of solid waste
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/28—Treating solids
    • G21F9/34—Disposal of solid waste
    • G21F9/36—Disposal of solid waste by packaging; by baling

Definitions

  • the present invention relates to the hot pressing of particulate materials and containers for use in such processes.
  • the hot pressing may be in a uniaxial pressing process or in an isostatic process.
  • Furthermore in the ceramics field parts of machines can be machined from blocks of ceramic material produced in a hot pressing process from particulate starting materials.
  • AU-B-72825/81 discloses a canister for use in processing radioactive waste material.
  • the canister has a thin cylindrical wall with a constant cross-section.
  • the canister is filled with radioactive waste in granule form, and then sealed before being heated and axially compressed to sinter the waste.
  • EP-A-0115311 Particularly for use in connection with the disposal of radioactive waste in a synthetic rock matrix, it has been proposed, e.g. in EP-A-0115311, to pour the starting materials into a generally cylindrical container having a bellows-like or convoluted side wall before the bellows is closed and subjected to the hot pressing stage.
  • the convoluted side wall has a serpentine shape.
  • the container when a screen is used to prevent the particulate starting material entering the convoluted region of the side wall, upon compression, the container mainly achieves reduction in volume by axial compression and portions of the wall fold and form a series of radially outwardly extending flange-like formations.
  • the present invention is directed towards the provision of containers for hot pressing of particulate materials in which a more advantageous final shape is achieved.
  • the pre-characterising part of claim 1 is based on EP-A-0115311, and the distinguishing features of the present invention are set out in the characterising part of claim 1.
  • a metal thin-walled container having a first end closed by a first end wall and a second end adapted to be closed by a lid after filling with particulate material, a side wall having outer portions and a reduced diameter portion intermediate the first and second ends and a pair of radially inwardly directed portions extending from the outer portions the reduced diameter portion, the side wall being such that when the container has been filled, closed and subjected hot isostatic pressing, the container undergoes significant axial compression, the radially inwardly directed portions closely approach or contact one another and the particulate material is compressed characterised in that each outer portion is outwardly curved to provide a shallow convex structure and the outer portions provide most of the axial extent of the side wall, whereby the volume of the compressed particulate material closely approaches the volume of an imaginary cylindrical envelope in which the compressed container can be accommodated.
  • the container may have two or more axially spaced reduced diameter portions, an important embodiment of the invention is one in which a single reduced diameter portion is provided.
  • the side wall has a smoothly curved profile provided at the axial ends thereof. This feature is especially beneficial when the invention is applied with hot isostatic pressing as radially inward compression takes place in this zone.
  • embodiments of the invention can also utilise hot uniaxial pressing and for this purpose, preferably, a restraining ring is provided around the reduced diameter portion and extending between the adjacent radially inwardly extending portions of the side wall.
  • the relative dimensions of the portions of the container may be varied according to the scale of the embodiment used and the materials adopted. Generally it has been found that especially beneficial embodiments of the invention are ones where the radially inwardly directed portions extend radially a relatively large distance compared with the spacing therebetween.
  • the radially inwardly extending portions extend radially to an extent of about 10% to 25% of the diameter of the container. Also preferably the spacing between adjacent radially inwardly extending portions is of the order of 5% of the diameter of the container.
  • the radial dimension of the radially inwardly directed portions is in the range of 10% to 20% of the diameter of the container and the spacings between the radially inwardly directed portions is about 5% of the diameter of the container.
  • the spacing between adjacent radially inwardly directed portions of the side wall is about 10% of the axial dimension of the generally cylindrical portions of the side wall leading to the radially inwardly directed portions.
  • the side wall of the container has a smooth change of shape with a transition portion extending substantially in a plane transverse to the axis of the container between the reduced diameter portion and the adjacent portion of the container.
  • a further advantageous feature which preferably also is utilised is the provision at one or preferably both of the ends of a configuration to permit axial displacement of the transverse end wall during the process.
  • this is achieved by the side wall curving smoothly inwardly at the end of the container to terminate in an axially directed skirt directed away from the body of the container, the skirt having a diameter similar to the reduced diameter portion of the container and a flanged end wall or lid being utilised within the skirt, its flange also being outwardly directed and welded to the free end of the skirt, whereby the annular region at the end of the container around the outside of the skirt is displaced axially during the hot compression.
  • the end wall having the lid is provided with an evacuation tube which is sealed e.g. by crimping when a vacuum is established.
  • Hot isostatic pressing of a particulate material can be performed by utilising a container in any one of the forms described above.
  • a further requirement is that the compressed container reliably achieves a predictable shape in the process so as to facilitate subsequent handling and storage.
  • the container 10 has a generally cylindrical side wall 11, a base wall 12 and a top cap or lid 13 from which an evacuation tube 14 extends.
  • the side wall 11 has two barrel-shaped portions 15 and 16 which have a shallow convex structure in sectional view and a reduced diameter intermediate portion 17 connected to the major barrel-shaped portions by transition wall portions 18 which extend approximately at right angles to the axis of the container.
  • the side wall 11 has a radially inwardly directed shoulder 19 leading to an axially extending skirt 20 which is outwardly directed and which is secured by a weld 21 to a corresponding skirt 22 of the base wall 12 and lid 13 as the case may be.
  • the container Before the cap 13 is installed, the container is filled with particulate material 23 such as ceramic powder or a mixture of radioactive waste and synthetic rock precursor. As shown in Fig. 1 the evacuation tube 14 leads to a ceramic fibre filter 24 retained within the cap 13 by a perforated screen 25.
  • particulate material 23 such as ceramic powder or a mixture of radioactive waste and synthetic rock precursor.
  • This feature is very important where egress of solid powder material with the gas upon evacuation is to be avoided at all costs such as in the case of treating radioactive material.
  • the tube 14 is crimped or sealed at 26 as shown in Fig. 2.
  • Fig. 2 after hot isostatic pressing a substantial reduction in axial length occurs and there is also reduction in diameter.
  • the transitional wall portions 18 closely approach or even touch one another and the base wall 12 and end cap 13 are axially displaced inwardly as deformation of the shoulder 19 occurs.
  • the container can be made of mild steel although for other applications more expensive and higher performing alloys may be needed such as selected grades of stainless steel.
  • FIG. 3 an alternative embodiment is described which is especially suitable for hot uniaxial pressing.
  • the same reference numerals have been used in Fig. 3 to refer to elements corresponding to those of Figs. 1 and 2.
  • Container 10 has a generally cylindrical side wall 11, a base wall 12 and a top 27 which includes a reinforced opening 28.
  • Side wall 11 has four barrell-shaped portions 29, 30, 31 and 32 separated by reduced diameter intermediate portions 17.
  • Portions 17 are connected to the barrell-shaped portions by transitional wall portions 18 which extend approximately at right angles to the axis of the container.
  • Metal rings 33 are located around the container in the recesses defined by reduced diameter portions 17 and radially extending portions 18. These rings are useful when the container is to undergo hot uniaxial pressing, during which the restraining rings 33 prevent deflections occurring in the bellows and the resulting convolutions which are a cause of wasted space.

Landscapes

  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Powder Metallurgy (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Claims (12)

  1. Dünnwandiger Metallbehälter mit einem ersten durch eine erste Abschlusswand (12) abgeschlossenen Ende und mit einem zweiten Ende, das, nachdem ein Teilchenmaterial (23) eingefüllt worden ist, mit einem Deckel (13) verschliessbar ist, mit einer Seitenwand (11), welche Aussenbereiche (15,16), einen Bereich (17) mit reduziertem Durchmesser, der zwischen dem ersten und zweiten Ende liegt, und ein Paar von radial nach innen gerichtete Bereiche (18) aufweist, wobei sich die nach innen gerichteten Bereiche (18) von den Aussenbereichen (15,16) zu dem reduzierten Bereich (17) erstrecken, wobei die Seitenwand (11) so geformt ist, dass, wenn der Behälter gefüllt, geschlossen und isostatischem Heissverpressen ausgesetzt ist, der Behälter (10) bedeutender axialer Kompression ausgesetzt ist und die radial nach innen gerichteten Bereiche (18) sich gegenseitig annähern oder sich berühren und das Teilchenmaterial zusammengepresst wird,
    dadurch gekennzeichnet, dass
    jeder Aussenbereich (15,16) in Form einer leichten konvexen Struktur nach aussen gebogen ist und dass die Aussenbereiche den grössten Teil der axialen Ausdehnung der Seitenwand (11) gewährleisten, so dass sich das Volumen des zusammengepressten Teilchenmateriales dem Volumen einer imaginären zylinderförmigen Hülle nähert, in die der zusammengepresste Behälter untergebracht werden kann.
  2. Behälter nach Anspruch 1, wobei sich die radial nach innen gerichteten Bereiche (18) bis ungefähr 10% bis 25% des Durchmessers des Behälters (10) radial nach innen erstrecken.
  3. Behälter nach einem der Ansprüche 1 oder 2, wobei der Abstand zwischen benachbarten radial nach innen gerichteten Bereichen (18) annähernd 5% des Durchmessers des Behälters (10) beträgt.
  4. Behälter nach einem der vorhergehenden Ansprüche, wobei der Abstand zwischen benachbarten radial nach innen gerichteten Bereichen (18) der Seitenwand (11) annähernd 10% der axialen Abmessung der Aussenbereiche (15,16) beträgt.
  5. Behälter nach einem der vorhergehenden Ansprüche, umfassend einen einzigen Bereich (17) mit reduziertem Durchmesser.
  6. Behälter nach einem der Ansprüche 1 bis 4, wobei die Seitenwand mindestens einen zusätzlichen Bereich (17) mit reduziertem Durchmesser und einen zusätzlichen Aussenbereich mit einem Paar radial nach innen gerichteten Bereichen (18) aufweist, wobei sich diese nach innen gerichteten Bereiche (18) von den Aussenbereichen (15,16) zu dem zusätzlichen reduzierten Bereich (17) erstrecken.
  7. Behälter nach einem der vorhergehenden Ansprüche, umfassend einen Metallring (33), der den Behälter zwischen benachbarten radial nach innen gerichteten Bereichen (18) der Seitenwand (11) umgibt, so dass ein Metallring (33) den oder jeden Bereich (17) mit reduziertem Durchmesser umgibt, wodurch der Behälter uniaxialem Heissverpressen ausgesetzt werden kann und der oder jeder Ring (33) äussere Deformationen des Behälters (10) verhindert.
  8. Behälter nach einem der vorhergehenden Ansprüche, wobei jede der Aussenbereiche (15,16) an seinem axialen Ende ein sanft gebogenes Profil aufweist, wobei die Profile radial nach innen gerichtet sind (19).
  9. Behälter nach einem der vorhergehenden Ansprüche, wobei die Seitenwand (11) an jedem der ersten und zweiten Enden sanft radial nach innen gebogen ist (19) und in einem axial gerichteten Rand (20) endet, der vom Körper des Behälters weggerichtet ist und der annähernd denselben Durchmesser aufweist wie der Bereich mit reduziertem Durchmesser und wobei eine geflanschte Abschlusswand (12,13) vorhanden ist, die innerhalb des Randes (20) angeordnet ist und mit diesem verschweisst (21) wird, nachdem der Behälter (10) gefüllt worden ist, wobei ein ringförmiger Bereich (19) um den Rand vorhanden ist, um während dem Heissverpressen des Behälters (10) axiale Verschiebungen des Hauptteils der Abschlusswand (12,13) zu erleichtern.
  10. Behälter nach einem der vorhergehenden Ansprüche, wobei an einem Ende des Behälters (10) ein Entlüftungskanal (14) vorhanden ist, so dass der Behälter (10) nach dem Füllen und Verschliessen evakuierbar ist und der Kanal (14) mittels isostatisches Heissverpressen zu einer Abdichtung verformbar ist.
  11. Verfahren zur Herstellung eines dichten keramischen Materiales, wobei ein Behälter nach einem der Ansprüche 1 bis 6 oder 8 bis 10 mit keramischem Teilchenmaterial gefüllt wird und der Behälter evakuiert und isostatischem Heissverpressen ausgesetzt wird.
  12. Verfahren zur Herstellung eines dichten keramischen Materiales, wobei ein Behälter nach einem der Ansprüche 1 bis 10 uniaxialem Heissverpressen ausgesetzt wird.
EP89911001A 1988-09-27 1989-09-27 Heissverpressen von teilchenmaterial Expired - Lifetime EP0483139B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AU641/88 1988-09-27
AUPJ064188 1988-09-27
PCT/AU1989/000417 WO1990003648A1 (en) 1988-09-27 1989-09-27 Hot pressing of particulate materials

Publications (3)

Publication Number Publication Date
EP0483139A4 EP0483139A4 (de) 1991-11-14
EP0483139A1 EP0483139A1 (de) 1992-05-06
EP0483139B1 true EP0483139B1 (de) 1995-09-13

Family

ID=3773402

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89911001A Expired - Lifetime EP0483139B1 (de) 1988-09-27 1989-09-27 Heissverpressen von teilchenmaterial

Country Status (5)

Country Link
EP (1) EP0483139B1 (de)
JP (1) JPH0742483B2 (de)
AT (1) ATE127954T1 (de)
DE (1) DE68924278T2 (de)
WO (1) WO1990003648A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012164337A1 (en) 2011-06-02 2012-12-06 Australian Nuclear Science And Technology Organisation Modularized process flow facility plan for storing hazardous waste material
AU2011369812B2 (en) 2011-06-02 2015-07-23 Australian Nuclear Science And Technology Organisation Filling container and method for storing hazardous waste material
JP6382716B2 (ja) 2011-06-02 2018-08-29 オーストラリアン ニュークリア サイエンス アンド テクノロジー オーガニゼーション 有害廃棄物を封止可能な容器内に移送するための充填デバイス、システム、および方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3169647D1 (en) * 1980-05-19 1985-05-09 Asea Ab Method for treating radioactive material and container for enclosing such material
AU524883B2 (en) * 1980-07-15 1982-10-07 Australian Atomic Energy Commission Containing waste material
DE3175445D1 (en) * 1980-07-15 1986-11-13 Atomic Energy Of Australia Arrangements for containing waste material
US4645624A (en) * 1982-08-30 1987-02-24 Australian Atomic Energy Commission Containment and densification of particulate material
AU552755B2 (en) * 1982-08-30 1986-06-19 Australian Atomic Energy Commission Containment of waste material
SE442562B (sv) * 1983-01-26 1986-01-13 Asea Ab Sett att innesluta radioaktivt eller annat farligt avfall och en behallare for sadant avfall
DE3682143D1 (de) * 1985-07-16 1991-11-28 Australian Nuclear Science Tec Behaelter mit waermeuebertragungs- und stabilisierungseigenschaften.
AU597385B2 (en) * 1986-06-25 1990-05-31 Australian National University, The Encapsulation of waste materials
AU592669B2 (en) * 1986-09-30 1990-01-18 Australian Nuclear Science & Technology Organisation Encapsulation of waste materials
EP0296855A3 (de) * 1987-06-23 1989-12-06 Australian Nuclear Science And Technology Organisation Lagermethode für radioaktives Abfallmaterial

Also Published As

Publication number Publication date
EP0483139A1 (de) 1992-05-06
DE68924278T2 (de) 1996-02-15
ATE127954T1 (de) 1995-09-15
DE68924278D1 (de) 1995-10-19
WO1990003648A1 (en) 1990-04-05
JPH0742483B2 (ja) 1995-05-10
EP0483139A4 (de) 1991-11-14
JPH04502489A (ja) 1992-05-07

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