EP3363024A1 - Dispositif de malaxage concu notamment pour conditionner des dechets nucleaires dans du ciment, et procede - Google Patents
Dispositif de malaxage concu notamment pour conditionner des dechets nucleaires dans du ciment, et procedeInfo
- Publication number
- EP3363024A1 EP3363024A1 EP16790534.8A EP16790534A EP3363024A1 EP 3363024 A1 EP3363024 A1 EP 3363024A1 EP 16790534 A EP16790534 A EP 16790534A EP 3363024 A1 EP3363024 A1 EP 3363024A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- fingers
- waste
- drum
- cement
- 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 kneading device designed in particular for conditioning nuclear waste in inert matrices based on cement or other types of hydraulic binders such as geopolymers, as well as a corresponding method performed with this device.
- Nuclear waste is incorporated in such matrices before being stored for long periods.
- Mixing involves mixing the waste with cement, water and possibly sand or other additives to give a homogeneous content.
- the technique is controlled in itself, but some disadvantages are sensitive in known methods. It happens first of all that the mixture is too compact for a correct mixing. A vortex may then appear during the process, i.e. the free surface of the mixture is underpressure in the middle with respect to the edge, which decreases the filling rate of the drum in which the kneading is produced and limits the mixing speed. Finally, a relatively large amount of the mixture continues to adhere to the mixing blade once it is completed and the blade is removed from the mixture, which reduces the filling of the barrel again and requires blade cleaning. before the next use.
- the invention constitutes an improvement of the known devices. It applies to the packaging of waste including nuclear waste may be composed of graphites, zeolites, ion exchange resins, diatoms, uranium, etc., the composition may include all or part of these ingredients.
- the size of waste grain may be between 0 and 10 mm. Mixing is generally done in the ultimate storage drum.
- the blade is animated by a circular movement, or possibly more complex, planetary for example, without it being necessary.
- the invention relates to a drum kneading device, designed in particular for conditioning nuclear waste in inert cement matrices, comprising a drum and a mobile blade performing kneading in a circular motion, where the blade comprises a connecting end to a motor device overhanging the barrel and rotating the blade about an axis of rotation, fingers parallel to the axis of rotation of the blade and finger connection bars to the tip, characterized in that that the bars are horizontal and all connect to upper portions of the fingers.
- This blade limits the torque necessary for mixing and the vortex effect thanks to the vertical fingers, and it minimizes the retention of material on the blade and thus reduces the creation of secondary waste associated with the rear rinsing of the blade, thanks to horizontal bars at the top of the blade, which disperse the materials to be kneaded.
- the fingers may or may not have variable spacings. It is advantageous that they are however distributed in two sets on either side of the axis of rotation, the end fingers being at the same distance from the axis of rotation. No finger is advantageously present in the axis of rotation of the blade.
- the fingers have a polygonal section with a ridge located forward in the direction of rotation of the fingers, to promote the mixing of materials.
- the homogeneity of the mixture is also improved if the device comprises an introduction tube into the barrel having a diameter of between about one third and two thirds of the diameter thereof. Bars integral with the blade and rotating in the tube can also increase these advantages by promoting the uniform dispersion of the material over the entire section of the conduit.
- the process proposed here is characterized in that it consists in pouring into the barrel first waste and water, then cement and sand (the latter two together or successively). Water is poured at an early moment, the incorporation of cement, which has all the water necessary for its hydration, is easy. To obtain a mixture of a defined rheology, a measurement of the torque necessary for mixing can enslave the introduction of a fluidizing additive into the flow as soon as the value of this torque exceeds a threshold.
- FIG. 1 is a diagram of the device
- FIGS. 2 and 3 represent the mixing paddle from the side and in view.
- the mixing of the waste is done in a drum 1, into which a mixing tool, called paddle 2, is driven in rotation by the rotating shaft of FIG. a motor 3 overhanging.
- a guide tube 4 for the introduction of the ingredients of the mixture to be kneaded opens above the barrel 1, in the center thereof.
- the tube 4 is fixed or rotating. In the latter case, it can be fixed to the blade 2.
- Tanks of materials (metering units) 7 can be emptied into the tube 4 by ducts 8.
- a control device 9 can regulate the opening of one of these ducts 8, by means of a sensor 10, according to the torque of the motor shaft 3.
- the blade 2 is described with reference to Figures 2 and 3. It comprises vertical fingers 11, six in number in this embodiment, connected by one or more horizontal connecting bars 12.
- a tip 13 connected to the connecting bars 12 connects to the rotating shaft of the motor 3.
- the fingers 11 are generally the same height and the same section, but their spacing steps may be different.
- the section of the fingers 11 is polygonal and more precisely square, with a ridge 14 directed in the direction of advance; other forms of fingers, also tapered forward, would have the same advantage of promoting the homogenization of the mixture.
- the straight and horizontal connecting bars 12 of the blade 2 allow a dispersion and a better distribution of the materials introduced via the tube 4.
- the vertical fingers 11 produce a low torque and vortex-free mixing, especially since they are the only ones to enter the kneaded mixture.
- the operations associated with the recommended methods are as follows.
- the barrel 1 is brought with or without the waste and the water at its kneading position in line with the blade 2 constituting the stirring device.
- the blade 2 is fixed to the motor 3, which can be moved vertically, so as to lower the blade 2 in the barrel or to extract it.
- the blade 2 can thus be introduced into the barrel 1 or removed.
- the tube 4 is also vertically movable to allow the removal of the blade 2. If the barrel 1 does not contain waste and water, they can be introduced before the descent of the blade 2 or after, then the other ingredients are introduced while the blade 2 is turning. After removal of the blade 2 and its dripping, the drum 1 full can be evacuated and closed. Alternatively, the blade 2 can be sacrificed and left in the barrel 1.
- the order of the introduction of the ingredients is an important aspect of the process.
- the waste and the water are introduced first into the drum 1, either at a dedicated station or at the mixing station shown in FIG. 1.
- the advantage of starting the introductions by the waste makes it possible to control the contents and to correct them. possibly the amount introduced to overcome a dosage error or other, or take into account uncertainties related to the knowledge or homogeneity of waste.
- the correction can be done by a peristaltic pump for example to change the amounts of waste or water.
- several drums 1 can thus be prepared in advance by filling them with waste and water to chain several coatings and increase the production capacity, since the mixing has not yet begun and that the blade 2 is therefore useless at this stage.
- the cement is then gradually introduced into the barrel 1, the blade 2 then being put into action to actually start mixing.
- the flow is adjusted according to the nature of the waste and the frequency of rotation of the blade 2.
- the introduction of the cement alone after the water and the waste makes it possible to have all the water for its hydration, which improves its incorporation and reduces or even avoid the use of fluidifying adjuvants which have a limited duration of effectiveness over time.
- the availability of water allows not only to facilitate the hydration of the cement, but it also limits the diffusion of dust during the introduction of the cement.
- the very fine grain size of the cement makes it possible to fetch the free water stored even in the pores of the waste. It has been verified that the situation would be different if sand were introduced before the cement: the contents of the drum 1 would become very viscous, so that the complete introduction of the ingredients would be problematic. When the cement has been introduced, the sand can be.
- the criterion of addition of fluidifiers can be based on a measurement of the torque of the rotating shaft of the engine 3: as soon as a torque threshold is crossed, the control device 9 controls the opening of the fluidizer tank to introduce a defined fluidizer dose. After a reaction time, the operation can be renewed if the torque value is not satisfactory. It should be noted that the fluidifiers are effective for a relatively short period of time, for example 15 to 20 minutes, which justifies their introduction only at a final stage of mixing.
- the end of the mixing, once all the components introduced, is determined by a stabilization of the torque of the engine 3, which indicates a homogeneous mixture.
- the guide tube 4 has a smaller diameter than the barrel 1 (for example between one third and two thirds of this diameter) and opens to about 100 mm from the top thereof.
- the materials are then distributed inside the tube 4.
- the diameter is typically half that of the barrel 1. It can be adjusted.
- the tube 4 may have a cylindrical or conical shape. It can be fixed or linked to the blade 2 and rotate with it.
- the horizontal bars of the blade 2 improve the distribution of the material introduced on the surface of the barrel 1, and allow to incorporate it faster. Better incorporation gives the possibility of having faster introduction rates.
- the tube 4 eliminates certain problems of the known processes: the rebound outside the barrel of the materials introduced to the surface of the mixture, the projections of the materials outside the barrel 1 to the passage of the blade 2, and it limits the lifting of dust.
- the guide makes it possible not to pollute the edge of the barrel 1 and its surroundings: there is no more imposed cleaning, problematic, of the surroundings.
- the portion of the blade 2 which enters the mixture is limited to vertical fingers 11 and smooth, their dripping is almost perfect if one chooses to remove the blade 2 at the end of the process to reuse it, hence a small use water for washing, which must then be safe and store it too if it is contaminated.
- no vertical forces are produced during mixing, which reduces energy expenditure.
- the profile of the blade 2 generates very few vortex effects, which keeps the edges of the barrel 1 clean and allows a maximized filling.
- the apical void may be 5 cm for a drum 1 100 cm high. This value can be further reduced by reducing the frequency of rotation of the blade 2, below 50 revolutions per minute for example. The incorporation of dry matter, however, becomes less effective.
- Blades 2 comprising different widths and numbers of fingers may advantageously be provided for drums 1 of different diameters.
- the number of fingers 11 may be even or odd. As we have seen, an asymmetrical arrangement improves mixing, vibration due to imbalance.
- the outer fingers 11a and 11f are preferably symmetrical to avoid generating oscillations of the blade 2 laterally.
- the spacing may be preferred to at least 80 mm and at most equal to about half a radius of the barrel 1.
- the various process parameters can be adjusted at will by the operator. Speeds of 100 rpm for a blade diameter 2 of 0.64 meters can be applied to the extreme fingers 11a and 11f.
- the rotation frequency can be 50 rpm.
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)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1559816A FR3042637B1 (fr) | 2015-10-15 | 2015-10-15 | Dispositif de malaxage concu notamment pour conditionner des dechets nucleaires dans du ciment, et procede |
| PCT/EP2016/074900 WO2017064328A1 (fr) | 2015-10-15 | 2016-10-17 | Dispositif de malaxage concu notamment pour conditionner des dechets nucleaires dans du ciment, et procede |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3363024A1 true EP3363024A1 (fr) | 2018-08-22 |
| EP3363024B1 EP3363024B1 (fr) | 2021-05-19 |
Family
ID=55486754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16790534.8A Active EP3363024B1 (fr) | 2015-10-15 | 2016-10-17 | Dispositif de malaxage concu notamment pour conditionner des dechets nucleaires dans du ciment, et procede |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3363024B1 (fr) |
| FR (1) | FR3042637B1 (fr) |
| WO (1) | WO2017064328A1 (fr) |
Family Cites Families (6)
| 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 |
| FR2585503A1 (fr) | 1985-07-25 | 1987-01-30 | Barret Jean Louis | Procede de conditionnement par solidification de dechets dangereux d'origine industrielle ou nucleaire |
| DK171944B1 (da) * | 1985-11-01 | 1997-08-25 | Laursen As A P | Godningsspreder navnlig til granuleret kunstgodning med spredeaggregat beholder og heri anbragt rorevaerk |
| GB201002417D0 (en) * | 2010-02-12 | 2010-03-31 | Nuclear Decommissioning Author | Mixing apparatus and method |
| 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 FR1559816A patent/FR3042637B1/fr active Active
-
2016
- 2016-10-17 WO PCT/EP2016/074900 patent/WO2017064328A1/fr not_active Ceased
- 2016-10-17 EP EP16790534.8A patent/EP3363024B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP3363024B1 (fr) | 2021-05-19 |
| FR3042637B1 (fr) | 2022-04-01 |
| WO2017064328A1 (fr) | 2017-04-20 |
| FR3042637A1 (fr) | 2017-04-21 |
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