EP2563515B1 - Zerkleinerungsvorrichtung zum zerkleinern von mineralischen stoffen mit einer walzenpresse - Google Patents

Zerkleinerungsvorrichtung zum zerkleinern von mineralischen stoffen mit einer walzenpresse Download PDF

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Publication number
EP2563515B1
EP2563515B1 EP20110731441 EP11731441A EP2563515B1 EP 2563515 B1 EP2563515 B1 EP 2563515B1 EP 20110731441 EP20110731441 EP 20110731441 EP 11731441 A EP11731441 A EP 11731441A EP 2563515 B1 EP2563515 B1 EP 2563515B1
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EP
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Prior art keywords
separator
granulometry
matter
exit
particles
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Not-in-force
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EP20110731441
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English (en)
French (fr)
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EP2563515A1 (de
Inventor
Marcel Bourgeois
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Vicat SA
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Vicat SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/30—Passing gas through crushing or disintegrating zone the applied gas acting to effect material separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/32—Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers

Definitions

  • the present invention relates to a grinding plant for mineral materials, in particular intended to be installed in a cement plant.
  • Cement manufacturing involves several stages, each of which consumes a significant amount of energy. Among these steps, there are in particular two grinding steps that occur at the beginning for one and at the end of the manufacturing for the other. These are energy hungry stages.
  • the first grinding stage is the grinding of the raw material which represents 20 to 30% of the total consumption of electrical energy during the manufacture of the cement. It also performs the mixing and drying of this material, called raw flour, this before the firing step at a temperature of the order of 1450 ° C.
  • the second step of grinding intervenes on the product of cooking: the clinker. It represents 30 to 50% of the total consumption of electrical energy during the manufacture of cement and is an essential step in the production of cement.
  • the present invention is more particularly aimed at this second grinding stage, that of the clinker, but may also relate to the first grinding stage concerning the production of raw flour.
  • current milling plants of type comprising a roller press, generally comprise a static separator, usually of the cascade type, the purpose of which is to dust off, and to dry the raw material and to break, dusting the agglomerated material (or patties ) resulting from grinding by the press, a roller press which allows to lower the particle size of the material and a dynamic separator to select the particles having the desired particle size.
  • the closure of the cascade-type static separator with the roller press makes it possible, in this type of installation, to recycle the material, the particle size of which remains too high despite a first passage in the roller press.
  • Such an installation is for example described in the document EP 0 650 763 A1 .
  • This type of installation if it is perfectly adapted to ensure adequate particle size of the final product, still consumes a very large amount of energy, due in particular to the recycling, in the roller press, of material of small particle size which should go to the finished product.
  • the present invention aims to remedy this disadvantage.
  • the technical problem underlying the invention therefore consists in providing a grinding plant for mineral materials with a roller press which, while having the grinding and drying qualities of current installations, requires, for a dedicated tonnage of mineral matter to be treated, a reduced amount of energy.
  • the invention relates to a grinding plant for mineral materials with a roller press, of the type comprising a first static separator, the inlet of which is fed with raw material, comprising two outlets, the first outlet for the low-level particles. particle size and the second output, for the material of greater particle size, the latter being connected to a roller press, the first output of the first static separator being connected to the input of a dynamic separator having two outputs, a first output for particles of desired particle size and a second outlet for the material of greater particle size, connected to the inlet of the roller press, a ventilation circuit being provided through the first static separator and the dynamic separator, to participate in the separation, drying and transport particles of small particle size, the installation comprising a second static separator whose input is connected only to the output of the roller press and at least one of the outputs of particles of small particle size, is connected to the dynamic separator, the first static separator being fed only by the raw material and the second static separator being traversed by the ventilation circuit.
  • the installation comprises a load shedding circuit.
  • Such a circuit makes it possible, during start-up and adjustment of the roller press, to unload the material passed through the press and which, for constraints related to the technology of grinding by a roller press, is only very slightly crushed. . This limits the load imposed on the press in the primordial moments of startup and settings, thereby increasing the life of the press and the dynamic separator.
  • the load shedding circuit comprises a hopper whose input can be temporarily connected to the output of the roller press and whose output is connected to the first static separator.
  • the material roughly crushed by the press can be stored in the hopper and be reintroduced gradually with the raw material thus limiting the load imposed on the press during startup.
  • the unloading circuit comprises a hopper whose input can be temporarily connected to the second output of the second static separator, that of the material of large particle size.
  • At least one of the static separators is of cascade type.
  • Such separators are, by their design, robust, able to handle coarse materials and having a high power of disintegration and drying. This type of separator is ideal both to treat the raw material and make a first sort of the material after grinding.
  • the raw material feed of the first static separator comprises a plurality of hoppers, a weight metering means associated with each hopper and means for conveying said material to the first static separator.
  • Such a supply of the first static separator, and therefore of the grinding plant makes it possible to define, from the grinding stage, by the use of different hoppers containing different components and the use of dosing means, the desired mixture which constitutes the finished product, ie cement or raw flour (for a suitable installation for the first grinding stage of cement manufacture).
  • the installation comprises means for detecting metallic materials and these detection means control the rejection of said materials through a rejection circuit.
  • the first output of the dynamic separator is connected to a filtration device which will allow particles of small particle size to be separated from the air of the ventilation circuit, and the filtration device is connected to a product transport system.
  • the inlet of the roller press is equipped with a feed hopper.
  • This hopper ensures both a continuous supply and a control of the amount of material feeding the press.
  • the second static separator comprises two outlets, one of the outlets for the particles of small particle size and one for the material of large particle size, and the output of the high particle size material is connected to the dynamic separator.
  • Such a coupling makes it possible to supply the dynamic separator with the crushed material previously passed through the second static separator and thus having been suitably disintegrated.
  • Such an order of passage makes it possible to ensure a good separation between the particles of small particle size and the material of large particle size and thus to replenish the press with a reduced quantity of material having a large particle size (less particles of small particle size in the material reintroduced in the press) and thus lighten the load reintroduced into the press, thereby increasing the load of raw material.
  • This induces a significant increase in the efficiency of the entire plant for an equivalent amount of energy.
  • the efficiency to be applied for the separation of the pressed material is that of the dynamic separator (85 to 90%) and no longer that of the first static separator (40 to 50%).
  • the second static separator comprises two outlets, one of the outlets for the particles of small particle size and one for the material of large particle size, and the output of the material of large particle size is connected to the entry of the first static separator.
  • Such a coupling of the second output of the second static separator with the inlet of the first separator allows the milled material to pass through two separators and therefore, by an optimization of the disintegration of the wafers from grinding, optimum recovery of particles of small particle size after each grinding.
  • the second static separator comprises two outlets, one of the outlets for the particles of small particle size and one for the material of large particle size, and the output of the material of large particle size is connected directly to the roller press.
  • At least one inlet and / or one outlet of at least one separator is equipped with a sealing valve.
  • Such a valve makes it possible to limit the phenomena of "false air” that can occur at the level of the separators.
  • the figure 1 presents a grinding plant of mineral raw material with roller press according to the state of the art.
  • Such an installation comprises supply means 1 of raw material, metal material detection means 2 coupled to a reject circuit 3, a static separator 4, a roller press 5, a dynamic separator 6, a ventilation circuit 7 and a circulation circuit 8 for the finished product.
  • the mineral materials for example clinker, gypsum and adducts such as blast furnace slag or ash, are injected into the circuit of the installation.
  • Each hopper is associated with a weight dispenser 10 so as to achieve during the introduction of the various components in the circuit of the installation a mixture to the given composition, for example, for CEMI cement, 95% clinker and 5% gypsum.
  • This raw material is then transported by a conveying means 11 such as a belt conveyor, a bucket elevator or a chain conveyor.
  • a conveying means 11 such as a belt conveyor, a bucket elevator or a chain conveyor.
  • These means are, in the schematic illustration of the figure 1
  • the raw material passes through a metal particle detection system 2 which, when the raw material contains such particles, redirects the material to a rejection circuit 3.
  • the rejection circuit 3 after a filtration procedure for selectively recovering the metal particles in a reject hopper 12, redirects the sorted raw material to the conveying means 11 which bring them, along with the rest of the raw material, to the inlet 13 a static separator 4.
  • This static separator 4 usually of cascade type, is connected to the ventilation circuit 7.
  • This adjustment is obtained by combining air heating means such as a hot gas generator or the heat related to the equipment of the cement plant such as the exhaust gas from an oven or a cooler, and cooling means such as external air injection.
  • air heating means such as a hot gas generator or the heat related to the equipment of the cement plant such as the exhaust gas from an oven or a cooler
  • cooling means such as external air injection.
  • the particles of small particle size are directed by the air flow to a first outlet 14 of the cascade separator 4, while the rest of the material is directed to the second outlet 15 connected to a feed hopper 16 of the press. rollers 5.
  • the passage of the material of large particle size through this hopper 16 will allow to regulate the supply of the roller press 5.
  • the material of large particle size is then ground through the roller press 5 and spring in a mixture of fine particles and wafers of agglomerated material. The material thus ground is then, at the outlet 17 of the press 5, reintroduced via conveying means 18, generally bucket elevator type into the static separator 4.
  • the slabs, mixed with the raw material are disintegrated, partially releasing the particles of small particle size which are carried by the air flow to the first outlet 14 of the static separator 4.
  • This first outlet 14 is connected to the input 19 of a second separator 6 of dynamic type.
  • This separator 6 which is preferably a vertical axis squirrel cage third generation separator, makes it possible to select the particles of the required size which are carried by the air flow towards a first outlet 20.
  • the rest of the material is returned via a second outlet 21 and a conveying means 22 generally conveyor belt type to the feed hopper 16 of the press 5 to reduce their particle size.
  • the particles selected and thus passing through the first output of the dynamic separator are transported by the ventilation circuit 7 to a filtration device 23 which will collect the finished product with the required composition and particle size.
  • This product is then transported by a transport system 24 of powdery products, such as a hovercraft 24, to be stored in storage silos before being packaged for sale or sent to the oven after homogenization (for a suitable installation for obtaining raw flour).
  • the figure 2 illustrates a first embodiment of a grinding plant according to the invention.
  • a grinding installation differs from the installation according to the prior art in that the output of the press can be connected by a conveyor system 25 either to a shedding circuit 26 or to a second static separator 27, also of type cascade, whose two outputs 28,29 are connected to the dynamic separator 6.
  • the feed hoppers 9 feed the installation with mineral materials.
  • this raw material is fed by a conveyor system 11 to the first cascade separator 4 which performs a first sorting of the raw material, the material of large particle size is taken to the press 5 through the inlet hopper 16 of the press 5.
  • the raw material when it passes through the roller press 5, is only very slightly ground.
  • a load shedding circuit 26 comprising a load shedding hopper 30 and a weighing means 31 connected to the first cascade separator 4.
  • the material is then stored in the unloading hopper 30 until the roller press 5 reaches its nominal value of specific grinding energy, for example a value of the order of 2 kWh / t.
  • the lightly ground material, stored in the unloading hopper 30, is gradually mixed with the raw material, this through the first static separator 4. It thus returns to the roller press 5 to be properly ground.
  • This second separator 27 will allow, for this suitably ground material, to The material thus obtained, a mixture of coarse materials and fine particles, is returned, through the two outlets 28, 29 of the second separator, to the slabs formed during the grinding by the roller press.
  • the dynamic separator 6. The particles of small particle size being disjoint from the rest of the material, the separator 6 will, because of its high selectivity, selective sorting out, by a first outlet 20, the fine particles to the particle size desired and by a second output 21, the material of greater particle size.
  • the latter material is sent back to the press 5 for a new grinding, disintegrating and sorting cycle, until the desired particle size is obtained.
  • the particles having the desired particle size ie particles smaller than a few micrometers in size, are transported by the ventilation circuit 7 of the first outlet 20 of the dynamic separator 6 to a filtration device 23.
  • This filtration device makes it possible to collect the finished product with the required composition and particle size.
  • This product is then transported by a transport system 24 of powdery products, such as a hovercraft 24, to be stored in storage silos before being packaged for sale or sent to the oven after homogenization (for a suitable installation for obtaining raw flour).
  • a grinding plant of mineral materials according to this embodiment allows, by increasing the amount of small particle size material recovered after each grinding and thus increasing the efficiency of the entire plant, a lowering of the consumption per ton of ground mineral by more than 16% and reduce by two the capacity of the feed hopper 16 as well as that of the transport system 25.
  • the figure 3 illustrates a second embodiment of a grinding plant according to the invention.
  • Such a grinding installation differs from the first embodiment in that an outlet 29 of the second static separator 27, the outlet of material of large particle size, is connected to a conveying means 32 to the feed hopper 16 of the roller press 5.
  • the feed circuit 9, 10, 11, 13 of the press and the unloading circuit 25, 26 function identically to the first embodiment.
  • the change related to this second embodiment occurs only after passage of the material in the second static separator 27. During this passage, the material of large particle size, exiting through the second outlet 29 of the second static separator 27 is no longer returned to the dynamic separator 6 but directly into the feed hopper 16 of the press 5 this by means of Conveying 32. Thus, the material rich in coarse materials is ground again to lower the particle size while only particles of small particle size from the first outlets 24, 28 of the two static separators 4, 27, pass through the dynamic separator 6.
  • These fine particles, identical to the first embodiment are transported by the ventilation circuit 7 to a filtration device 23 which will collect the finished product with the required composition and particle size. This product is then transported by a transport system 24 of powdery products, such as a hovercraft 24, to be stored in storage silos before being packaged for sale or sent to the oven after homogenization (for a suitable installation for obtaining raw flour).
  • a third embodiment not illustrated here, consists, for an installation similar to the first embodiment, in connecting the second outlet 29 of the second cascade separator 27, that corresponding to the material of large particle size, to the conveying means. 11 supply of the installation. This allows the milled material to pass through two static separators 6,27 and thus, by optimizing the disintegration of the slabs from grinding, optimum recovery of particles of small particle size at each grinding.
  • the shedding circuit 26 is, during the load shedding phase, connected to the output of the 17.
  • a possible alternative is to supply, during this offloading phase, the load shedding circuit 26 from the second outlet 29 of the second static separator 27, this outlet 29 corresponding to the material of large particle size.
  • the output 17 of the roller press 5 is directly connected, as in cruising mode, to the input of the second static separator 27. This alternative makes it possible, during this load shedding phase, to recover, despite the low efficiency of the press 5, the particles of small particle size resulting from this partial grinding.
  • sealing valves 33 may be placed at the inputs 13, 34, 29 of materials and at the outlets 15, 29, 21 of particles of large particle size of the different separators 4, 27, 6.
  • the second separator has a flapper 33 on its inlet 34.
  • These valves 33 are installed in order to limit the phenomena of "false air” may occur at these separators (4, 27, 6).
  • the invention is not limited to the embodiments of this grinding plant of mineral materials described above as examples, it encompasses all the variants. It may especially be adapted to be used for grinding the raw material before cooking.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Claims (12)

  1. Anlage zum Zerkleinern mineralischer Stoffe mit Walzenpresse des Typs, die einen ersten statischen Abscheider (4) aufweist, dessen Eingang (13) mit Rohstoffen versorgt wird, der zwei Ausgänge (14, 15) aufweist, den ersten Ausgang (14) für Teilchen mit feiner Granulometrie und den zweiten Ausgang (15) für Stoff mit gröberer Granulometrie, wobei dieser Letztere mit einer Walzenpresse (5) verbunden ist, wobei der erste Ausgang (14) des ersten statischen Abscheiders (4) mit dem Eingang (19) eines dynamischen Abscheiders (6) verbunden ist, der zwei Ausgänge (20, 21) aufweist, einen ersten Ausgang (20) für die Teilchen mit gewünschter Granulometrie und einen zweiten Ausgang (21) für den Stoff mit gröberer Granulometrie, der mit dem Eingang der Walzenpresse (5) verbunden ist, wobei ein Belüftungskreislauf (7) durch den ersten statischen Abscheider (4) und den dynamischen Abscheider (6) vorgesehen ist, um an dem Abscheiden, dem Trocknen und dem Transport der Teilchen mit feiner Granulometrie teilzunehmen, dadurch gekennzeichnet, dass die Anlage einen zweiten statischen Abscheider (27) aufweist, dessen Eingang nur mit dem Ausgang (17) der Walzenpresse (5) verbunden ist und von dem mindestens einer der Ausgänge (28) für Teilchen mit feiner Granulometrie mit dem statischen Abscheider (6) verbunden ist, wobei der erste statische Abscheider (4) nur von dem Rohstoff versorgt wird, und dass der zweite statische Abscheider (27) von dem Belüftungskreislauf (7) durchquert ist.
  2. Anlage nach Anspruch 1, dadurch gekennzeichnet, dass die Anlage einen Entlastungskreislauf (26) aufweist.
  3. Anlage nach Anspruch 2, dadurch gekennzeichnet, dass der Entlastungskreislauf (26) einen Bunker (30) aufweist, dessen Eingang vorübergehend mit dem Ausgang (17) der Walzenpresse (5) verbunden werden kann, und dessen Ausgang mit dem ersten statischen Abscheider (4) verbunden ist.
  4. Anlage nach Anspruch 2, dadurch gekennzeichnet, dass der Entlastungskreislauf (26) einen Bunker (30) aufweist, dessen Eingang vorübergehend mit dem zweiten Ausgang (29) des zweiten statischen Abscheiders (27), dem des Stoffs mit grober Granulometrie, verbunden werden kann.
  5. Anlage nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass mindestens einer der statischen Abscheider (4, 27) des Kaskadentyps ist.
  6. Anlage nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Versorgung mit Rohstoff des ersten statischen Abscheiders (4) eine Mehrzahl von Bunkern (9), ein Gewichtsdosiermittel (10), das mit jedem Bunker (9) assoziiert ist, und ein Fördermittel (11) des Stoffs zu dem ersten statischen Abscheider (4) aufweist.
  7. Anlage nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Anlage Mittel zum Erfassen metallischer Materialien (2) aufweist, und dass diese Erfassungsmittel (2) das Ausscheiden der Materialien durch einen Ausscheidekreislauf (3) steuern.
  8. Anlage nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der erste Ausgang (20) des dynamischen Abscheiders (6) mit einer Filtervorrichtung (23) verbunden ist, die es erlaubt, die Teilchen mit feiner Granulometrie von der Luft des Belüftungskreislaufs (7) abzuscheiden, und dass die Filtervorrichtung (23) mit einem Fördersystem (24) für pulverförmiges Produkt verbunden ist.
  9. Anlage nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der Eingang der Walzenpresse (5) mit einem Versorgungsbunker (16) ausgestattet ist.
  10. Anlage nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass der zweite statische Abscheider (27) zwei Ausgänge (28, 29) aufweist, einen (28) der Ausgänge (28, 29) für die Teilchen mit feiner Granulometrie und einen (29) für den Stoff mit grober Granulometrie, und dass der Ausgang des Stoffs mit grober Granulometrie (29) mit dem dynamischen Abscheider (6) verbunden ist.
  11. Anlage nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass der zweite statische Abscheider (27) zwei Ausgänge (28, 29) aufweist, einen (28) der Ausgänge (28, 29) für die Teilchen mit feiner Granulometrie und einen (29) für den Stoff mit grober Granulometrie, und dass der Ausgang (29) des Stoffs mit grober Granulometrie mit dem Eingang des ersten statischen Abscheiders (4) verbunden ist.
  12. Anlage nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass der zweite statische Abscheider (27) zwei Ausgänge (28, 29) aufweist, einen (28) der Ausgänge (28, 29) für die Teilchen mit feiner Granulometrie und einen (29) für den Stoff mit grober Granulometrie, und dass der Ausgang (29) des Stoffs mit grober Granulometrie direkt mit der Walzenpresse (5) oder mit dieser Letzteren über einen Versorgungsbunker (16) verbunden ist.
EP20110731441 2010-04-29 2011-04-21 Zerkleinerungsvorrichtung zum zerkleinern von mineralischen stoffen mit einer walzenpresse Not-in-force EP2563515B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1053319A FR2959426B1 (fr) 2010-04-29 2010-04-29 Installation de broyage de matieres minerales avec presse a rouleaux
PCT/FR2011/050922 WO2011135237A1 (fr) 2010-04-29 2011-04-21 Installation de broyage de matières minérales avec presse à rouleaux

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EP2563515A1 EP2563515A1 (de) 2013-03-06
EP2563515B1 true EP2563515B1 (de) 2015-03-04

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US (1) US9016605B2 (de)
EP (1) EP2563515B1 (de)
CA (1) CA2797751A1 (de)
DK (1) DK2563515T3 (de)
ES (1) ES2536312T3 (de)
FR (1) FR2959426B1 (de)
WO (1) WO2011135237A1 (de)

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CN103717715B (zh) * 2011-06-03 2017-09-15 谐和能源有限责任公司 由废物材料制备过程设计燃料原料的系统和方法

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ES2536312T3 (es) 2015-05-22
CA2797751A1 (fr) 2011-11-03
EP2563515A1 (de) 2013-03-06
WO2011135237A1 (fr) 2011-11-03
US20130168476A1 (en) 2013-07-04
US9016605B2 (en) 2015-04-28
DK2563515T3 (en) 2015-05-11
FR2959426A1 (fr) 2011-11-04

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