EP3363023A1 - Dispositif de malaxage de produits contenus dans un fut - Google Patents
Dispositif de malaxage de produits contenus dans un futInfo
- Publication number
- EP3363023A1 EP3363023A1 EP16785415.7A EP16785415A EP3363023A1 EP 3363023 A1 EP3363023 A1 EP 3363023A1 EP 16785415 A EP16785415 A EP 16785415A EP 3363023 A1 EP3363023 A1 EP 3363023A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- drum
- tube
- axis
- portions
- 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.)
- Granted
Links
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
- G21F9/04—Treating liquids
- G21F9/06—Processing
- G21F9/16—Processing by fixation in stable solid media
- G21F9/162—Processing by fixation in stable solid media in an inorganic matrix, e.g. clays, zeolites
- G21F9/165—Cement or cement-like matrix
-
- 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
- G21F9/30—Processing
- G21F9/301—Processing by fixation in stable solid media
- G21F9/302—Processing by fixation in stable solid media in an inorganic matrix
- G21F9/304—Cement or cement-like matrix
Definitions
- the subject of the invention is a device for mixing products contained in a drum.
- It relates generally to the problems of conditioning industrial or nuclear waste, particularly the radioactive waste of small and medium activities that are encountered in nuclear energy.
- the packaging consists of mixing the waste and a matrix of cement or any other type by stirring the mixture with a blade, into a drum, which is then closed and constitutes the ultimate waste package.
- the method of the invention does not use a mixing tank as a separate element, and kneading is accomplished in the storage drum.
- Patent EP 2,624,257 A2 describes a mixing drum for nuclear waste, driven in part by the consumed intensity of the engine and constant mixing speed. The process uses only cement (no sand). The orders or the system of introduction are not defined. The device is very little described.
- Patent FR 2,585,503 A1 describes a method of packaging hazardous waste of industrial or nuclear origin. All the constituents of the hydraulic binder and additives are introduced into a drum equipped with a mixer. After transfer to a mixing unit, the waste is introduced with stirring. Additives may be incorporated at the end of kneading for various effects.
- Patent FR 2 984 877 A1 describes the use of a cement composition containing silica to lower the setting temperature, and the process associated with a mixture of waste in casks.
- the stirring device is formed by a set of blades.
- the main objects of the invention are to control the dissemination of dust and projections likely to appear when the constituents of the mixture are poured into the drum; to fill the drum completely and to be able to use high speeds of rotation of the blade, so as to accomplish the kneading briefly despite increased dust and projections; and lose the blade in the drum without difficulty and without having to clean the part of the drive shaft that is preserved.
- the advantages obtained are the absence of waste out of the drum at the end of the process, which eliminates a cleaning of the installation, including the upper part of the drive shaft of the blade when the blade is a lost blade; almost complete filling of the barrel; and a shortness of mixing made possible by the rotational speeds of the blade.
- the invention thus relates to a device for mixing products contained in a drum, comprising a rotating blade, driven by an upper shaft and extending into the drum, through a bore of a lid established on the barrel, and pipes for introducing additional waste products, characterized in that the upper axis is composed of two portions detachable from each other and in that the blade is suspended from one of said portions of the axis, which can go down the blade when it is detached from the other portions.
- the method of the invention was advantageously accomplished with a so-called lost blade, abandoned after the mixing, by detaching it from a part of its axis of rotation, which remains attached to the engine, because the lid of the drum can remain in place and maintain the containment to dirt and dust, after stopping them for the duration of mixing.
- the upper part of the shaft, attached to the motor, is far enough away from the drum cover to be free of dirt during mixing.
- the blade is suspended at the lower portion of the axis so that it can descend along the blade when it is detached from the other portions, it is easy to push it into the barrel after the mixing without having to lower the blade, which can occupy almost the entire section near the bottom of the barrel and thus give a more efficient mixing.
- the processes carried out with the invention can therefore be carried out with a volume of products of the drum rising almost at the level of the lid and filling almost completely the drum without dirt of the part of the axis which is fixed to the engine, since the Part linked to the blade can protrude strongly above the lid before being detached and lowered under it in the barrel, without encumbering or complicating the sealing of the lid.
- a lid usually the final lid of the package, placed on the drum during mixing and open only at its center to allow the passage of an axis of the blade with a reduced clearance, which can add another tube to above this bore in which the introduction tubes of the constituents of the mixture open, prevents dust splashes or other products by holding them under the cover and in the tube when present.
- the lid finally prevents overflow of the mixture during mixing.
- the device comprises an air suction pipe opening into the tube through an opening extending above the openings where the suction pipes open and below a top edge of the tube. The dust that could rise to the top of the tube are then sucked and permanently removed from the environment.
- the openings of the tube are advantageously provided with seals which retain the ends of the inlet or suction pipes, which then makes it possible to make these pipes easily removable from the tube.
- the pipes are composed of sliding portions, which allow retraction after kneading to clear the surroundings of the barrel.
- the two parts of the axis of the blade, detachable from one another, are sliding one inside the other, one of the internal portions having a polygonal section and the other portions , external, having an imprint of section also polygonal: the rotational drive is then obtained without other device, and the attachment and detachment of the blade can also be obtained easily, by a device such as a pin which passes through the two portions and can be removed easily afterwards.
- Another aspect of the invention is a method of mixing products in a barrel, comprising introducing and moving a blade into the barrel, pouring additional products into the barrel, the barrel being closed by a lid except at a passage of an axis of movement of the blade, characterized in that the Additional products are poured through the passage, and an air draw is produced over the passage.
- this process allows a good filling of the drum, an absence of dissemination of waste, and dust recovery.
- FIG. 1 is a general view of the mixing device
- FIGS. 5 and 6 illustrate a lost blade characteristic
- a diagram of the device is shown in Figure 1.
- a barrel 1 to serve as waste storage package embedded in a matrix is placed on a base. It comprises a flat bottom 2, a circular side wall 3, and a cover 4 crimped or otherwise connected to the upper edge of the side wall 3 and which preferably corresponds to the final lid of the package. However, it is open in the center, at a piercing 5, to allow mixing and the introduction of constituents of the mixture and additives, such as cement, sand, water, liquids improving the mixture or taking, etc.
- a blade 6 extends in the barrel 1, possibly occupying almost all its section and height, and a motor 7 drives it by an axis 8 of rotation, which extends through the bore 5.
- Non-cylindrical drums 1 may also be recommended, in particular with a rectangular or square section, and several blades may also be used to mix the entire volume without departing from the scope of the invention.
- the tube 9 is shown in FIG. 2. It is advantageously constructed of transparent material to enable the mixing conditions to be observed and it comprises, beneath a cylindrical main portion, a conical tip 12 enabling it to be driven into piercing 5, applying only a slight force to wedge it and obtain a hermetic fit.
- the conical tip 12 is advantageously built in more flexible material.
- the tube 9 further comprises openings 13 for receiving the pipes 10 and 11 and which are provided with lip seals 14 to retain, with a slight force, their ends.
- the axis 8 and the blade 6 are shown in Figure 4.
- the shape of the blade 6 can be any and is not the subject of the invention.
- the profile of the blade 6 is innovative: it comprises a double peripheral helical ribbon 25 which makes it possible to trace the mixture upward on an upward facing face of the helical strips 25; an absence of central axis which avoids agglomerates in the center; and vertical bars 26 surrounded by the helical ribbons 25 and extending on either side of the axis 8, without being aligned with it, to mix the central portion that can not mix the ribbons 25.
- This set guarantees homogeneous mixtures for almost all types of materials and regardless of the size of the drum 1.
- the number of vertical bars 26 is chosen according to the volume to be kneaded or even the material.
- the axis 8 is composed of an upper portion 19, depending on the motor 7, and a lower portion 20 extending the previous and depending on the blade 6.
- the portions 19 and 20 are polygonal section and nested one in the other, in a sliding way, at the same time as the upper portion 19 drives the lower portion 20 in rotation and the lower portion 20 can be detached from the upper portion 19 by sliding downwards.
- the device is in the state of Figure 1 to perform a mixing.
- the waste is already present in the drum 1, or is subsequently introduced with other constituents.
- the motor 7 is started, the blade 6 rotates, and the additives and constituents of the coating matrix are poured by the pipes 10 according to known procedures.
- the expansion of the mixture and its possible overflow from the barrel 1 are prevented by the lid 4, the free surface of the mixture, being normally hollowed out by the centrifugal forces at the central region, below the piercing 5. No eruption of the matrix in the tube 9 is therefore normally to be feared.
- the projections of fragments of material in the tube 9 are possible, but they strike its wall and fall back into the barrel 1.
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Accessories For Mixers (AREA)
- Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1559814A FR3042636B1 (fr) | 2015-10-15 | 2015-10-15 | Dispositif de malaxage de produits contenus dans un fut |
| PCT/EP2016/074898 WO2017064327A1 (fr) | 2015-10-15 | 2016-10-17 | Dispositif de malaxage de produits contenus dans un fut |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3363023A1 true EP3363023A1 (fr) | 2018-08-22 |
| EP3363023B1 EP3363023B1 (fr) | 2019-11-06 |
Family
ID=56068944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16785415.7A Active EP3363023B1 (fr) | 2015-10-15 | 2016-10-17 | Dispositif de malaxage de produits contenus dans un fut |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3363023B1 (fr) |
| FR (1) | FR3042636B1 (fr) |
| WO (1) | WO2017064327A1 (fr) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2910878C2 (de) * | 1979-03-20 | 1984-10-31 | Nukem Gmbh, 6450 Hanau | Vorrichtung zum Vermischen bioschädlicher Abfälle mit einem Bindemittel |
| FR2558072B1 (fr) * | 1984-01-18 | 1989-08-18 | Projets Etu Const Engineering | Couvercle antivortex |
| FR2569994B1 (fr) * | 1984-09-13 | 1986-11-21 | Technicatome | Dispositif de melange mobile |
| FR2585503A1 (fr) | 1985-07-25 | 1987-01-30 | Barret Jean Louis | Procede de conditionnement par solidification de dechets dangereux d'origine industrielle ou nucleaire |
| US4666676A (en) * | 1985-08-30 | 1987-05-19 | The United States Of America As Represented By The United States Department Of Energy | Radioactive waste processing apparatus |
| FR2984877B1 (fr) | 2011-12-22 | 2014-01-24 | Areva Nc | Conditionnement d'un dechet radioactif par cimentation |
| JP5684162B2 (ja) | 2012-02-03 | 2015-03-11 | 株式会社東芝 | 放射性廃棄物の処理方法及び処理装置 |
-
2015
- 2015-10-15 FR FR1559814A patent/FR3042636B1/fr not_active Expired - Fee Related
-
2016
- 2016-10-17 WO PCT/EP2016/074898 patent/WO2017064327A1/fr not_active Ceased
- 2016-10-17 EP EP16785415.7A patent/EP3363023B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| FR3042636A1 (fr) | 2017-04-21 |
| EP3363023B1 (fr) | 2019-11-06 |
| FR3042636B1 (fr) | 2018-09-28 |
| WO2017064327A1 (fr) | 2017-04-20 |
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