EP0286513B1 - Procédé et installation pour projeter un revêtement isolant et réfractaire multicouche et revêtement ainsi obtenu - Google Patents

Procédé et installation pour projeter un revêtement isolant et réfractaire multicouche et revêtement ainsi obtenu Download PDF

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Publication number
EP0286513B1
EP0286513B1 EP88400773A EP88400773A EP0286513B1 EP 0286513 B1 EP0286513 B1 EP 0286513B1 EP 88400773 A EP88400773 A EP 88400773A EP 88400773 A EP88400773 A EP 88400773A EP 0286513 B1 EP0286513 B1 EP 0286513B1
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EP
European Patent Office
Prior art keywords
water
layer
hopper
pasty
installation
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
EP88400773A
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German (de)
English (en)
French (fr)
Other versions
EP0286513A1 (fr
Inventor
Jean-Charles Daussan
Gérard Daussan
André Daussan
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.)
Daussan SAS
Original Assignee
Daussan SAS
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
Priority claimed from FR8704694A external-priority patent/FR2613256B1/fr
Application filed by Daussan SAS filed Critical Daussan SAS
Priority to AT88400773T priority Critical patent/ATE66735T1/de
Publication of EP0286513A1 publication Critical patent/EP0286513A1/fr
Application granted granted Critical
Publication of EP0286513B1 publication Critical patent/EP0286513B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings ; Increasing the durability of linings; Breaking away linings
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/44—Refractory linings
    • C21C5/441—Equipment used for making or repairing linings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/02—Linings
    • B22D41/023—Apparatus used for making or repairing linings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/14—Supports for linings
    • F27D1/141—Anchors therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings ; Increasing the durability of linings; Breaking away linings
    • F27D1/1636—Repairing linings by projecting or spraying refractory materials on the lining
    • F27D1/1642—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus

Definitions

  • the present invention relates to a method and an installation for applying an insulating and refractory coating consisting of at least two layers of equal or unequal thicknesses, of different compositions and of different water contents on surfaces such as the interior of metallurgical vessels .
  • An aqueous mixture is known according to French patent 2393637 of the applicant, in which an aqueous mixture is applied to the interior of a metallurgical container, such as a casting distributor, by molding, tamping or spraying with a trowel or the like. and curable pasty containing inorganic particles, optionally fibers, an organic and / or inorganic binder.
  • the first layer adjacent to the permanent refractory lining of the metallurgical container is not sinterable or is partially sinterable at the temperature of the liquid metal which is poured into the container, so that this layer is powdery at the end of casting and does not adhere to the wall of the container.
  • the second layer in direct contact with the liquid metal further sintered, which ensures mechanical cohesion for the entire duration of stay of the liquid metal inside the metallurgical container.
  • a spraying device comprising a hopper in which a liquid binder and a refractory charge are mixed in batch in order to prepare a smooth mixture which is conveyed by a pump to a lance. projection.
  • an additional refractory material is injected from a pressurized container upstream of the spray lance to be mixed with the above-mentioned creamy mixture.
  • This device thus makes it possible to spray a refractory coating inside a metallurgical container.
  • this device firstly produces a smooth premix comprising only part of the solid constituents which is conveyed in the premixer, in the pump and in the line preceding the spray lance, requires delicate maintenance of the entire device, a complete cleaning of it after each interruption and presents a risk of solidification of the binder in the pipes.
  • the fact that the device has a binder manufacturing center prohibits most of the time from injecting upstream of the spray lance various refractory materials which may be incompatible with the binder.
  • the object of the present invention is to provide a method and an installation which make it possible to remedy the drawbacks of the aforementioned known embodiment.
  • the method for applying an insulating and refractory coating consisting of at least two layers of equal or unequal thicknesses, of different compositions and of equal or different water contents on surfaces such as the interior of metallurgical vessels , whereby at least two aqueous, pasty and hardenable products are successively applied to the surfaces is characterized in that for each layer of different material, the corresponding products, pulverulent and / or fibrous, feed successively, continuously or discontinuously, one and the same projection machine on the surface to be coated.
  • each layer all of the solid constituents necessary for the formation of the layer are introduced. successively continuously or discontinuously in a tubular body containing an Archimedes screw, after which all of the constituents are sent successively continuously in a tubular body containing an Archimedes screw and / or kneading blades into which one introduces continuous the quantity of water necessary via a water dispenser to obtain the desired pasty consistency for each of the layers, the resulting pasty mixtures are then successively sent by gravity into a hopper or conveyed in this hopper to the using mixing blades towards a single pump and / or in a common pressure vat-mixer, then pushed successively by these propulsion means into a single tube at the end of which the various pasty mixtures are projected in turn, under pressure, through the same lance on the surface to be coated.
  • the installation for applying an insulating and refractory coating consisting of at least two layers of equal or unequal thickness, of different compositions and of equal or different water contents on surfaces such as l interior of metallurgical vessels, by which successively at least two aqueous, pasty and curable products are applied to the surfaces is characterized in that it comprises two pairs of tubular bodies each containing a dosing Archimedes screw and a screw respectively; / or kneading blades, means for supplying each of the pairs of tubular bodies with the solid constituents of each of the layers to be formed, the second tubular bodies each comprising a water inlet connected to means allowing continuous introduction into these tubular bodies the quantity of water necessary to obtain the desired pasty consistency for each layers, means being provided for sending the mixture leaving either the first two tubular bodies or the two other tubular bodies towards a pump connected to a single tubing for projecting the mixture.
  • the method and the installation in accordance with the invention have the advantage of operating continuously or discontinuously.
  • the dosing of the solid constituents is carried out continuously in the first tubular body containing the dosing screw.
  • the addition of water at an adjustable pressure and flow rate is carried out continuously in the second tubular body containing the mixing screw.
  • the addition of water can be done in a single tubular body performing the dosing function and the mixing function so that the pump and / or the pressure mixing tank receives (receive) continuously, a mixture having the consistency desired paste making it possible to achieve the optimal conditions for the routing of this mixture in the spraying tubing and the adhesion of the latter on the surface to be coated.
  • the single tubular body performing the dosing function and the mixing function with incorporation of the necessary water is designated hereinafter by the abbreviated term of: single tubular body.
  • the installation contains only a relatively small amount of pasty mixture capable of hardening.
  • the two second tubular bodies are merged into a single second substantially tubular body provided with a water inlet and means for kneading the pasty aqueous mixtures
  • the first two tubular bodies are merged into one first single tubular body which serves the hoppers and / or parts of hoppers containing the solid constituents of each of the layers to be formed, and which contains a dosing and kneading Archimedes screw
  • each of the hoppers or parts of hoppers containing the various solid constituents of each of the layers to be formed is equipped with means allowing or preventing the flow of the solid constituent which it contains.
  • the installation is designed to apply an insulating and refractory coating inside a metallurgical container such as a flow distributor 1 (see FIG. 4).
  • the coating is applied to the bottom and the lateral faces of the distributor 1 in the form of an aqueous and pasty mixture containing inorganic particles, optionally fibers, optionally an organic and / or inorganic binder and optionally pulverulent materials, as described by example in French patent 2393637 and French patent application 2585273 in the name of the applicant.
  • the installation comprises means such as a hopper 2 for continuously or discontinuously introducing all of the solid constituents of the aforementioned mixture into a first tubular body 3 in which is mounted in rotation a dosing and kneading Archimedes screw 4 which opens into a second tubular body 5 in which is mounted in rotation a kneader Archimedes screw 6.
  • This second tubular body 5 comprises a water inlet 7 connected to a cabinet 8 containing means allowing continuous or discontinuous introduction in this tubular body 5 the quantity of water necessary to obtain the pasty consistency desired for the mixture treated in this second tubular body 5.
  • Means are also provided for sending this mixture to a pump 9 allowing this mixture to be pushed into a tubing 10 comprising at its end a lance 11 (see FIG. 4) for projecting the pasty mixture inside the casting distributor 1.
  • the installation comprises two other tubular bodies 3a, 5a arranged symmetrically with respect to the tubular bodies 3 and 5 on a common frame 12.
  • These tubular bodies 3a, 5a contain a dosing Archimedes screw and mixer 4a and an Archimedes screw mixer 6a.
  • Means are provided for sending the mixture leaving either the two tubular bodies 3, 5 of the first pair, or the two other tubular bodies 3a, 5a to the single pump 9 connected to the tubing 10 for spraying the mixture.
  • the water inlets 7, 7a of the tubular bodies 5, 5a each containing a kneading Archimedes screw 6, 6a are connected to a cabinet 8 by means of pipes 13, 13a.
  • This cabinet 8 includes means for adjusting the pressure, a pressure gauge and a flow meter 14.
  • Each tubular body 3, 3a enclosing the dosing and kneading Archimedes screw 4, 4a is surmounted by a hopper 2, 2a for introducing the solid constituents of the mixture which comprises means for facilitating the flow of the mixture in the tubular bodies, such as a vibrator 15, 15a.
  • the mixture of solid constituents is introduced, for example, into the hoppers 2, 2a by means of plastic bags 16, 16a which are pierced on a cone 17, 17a provided in each hopper 2, 2a.
  • each tubular body containing the kneader Archimedes screw opens out above a single hopper 19 which may include level probes 50 and / or a timer for stopping the arrival of the material or for introducing the pasty mixture into the pump.
  • the hopper 19 is equipped with a vibrator 20b.
  • the Archimedes screw 6, 6a mounted in the tubular body 5, 5a comprising the water inlet 7, 7a may have a larger pitch and diameter than that 4, 4a mounted in the other tubular body 3, 3a which is supplied by the solid constituents.
  • the Archimedes screw 6, 6a can, as a variant, be replaced by mixing blades, shown in 6b in FIG. 1, mounted on the shaft of the dosing and kneading Archimedes screw 4, 4a and rotating around this shaft inside the second tubular body 5, 5a.
  • the pump 9 is situated substantially in the vertical axis of the hopper 19.
  • This pump 9 is shown in more detail in FIG. 2.
  • This comprises a rotor 21 driven in rotation along the aforementioned vertical axis by an electric motor 22 driving a shaft 38b provided with two coupling sleeves 38 and 38a thus playing the role of a universal joint.
  • This rotor 21 comprises a series of bosses 23 which cooperate with cells 24 formed in the stator 25 in which the rotor 21 rotates.
  • the bosses 23 thereof define with the cells 24 of the stator 25 compression chambers, the volume of which varies during rotation of the rotor, which makes it possible to propel the pasty mixture under pressure into the tube 10.
  • the end of the tubing 10 comprises a spray lance 11 shown in detail in FIG. 3.
  • This lance 11 comprises an outlet nozzle 26. Upstream of the latter is provided a compressed air intake device comprising an air intake pipe 27 and a needle 28 for adjusting the flow rate of air.
  • the pump 9a for propelling the pasty mixture formed in the tubular bodies 3, 5 and 3a, 5a and leaving the hopper 19a with kneading blades 39a is arranged along a horizontal axis.
  • the projection lance 11 disposed at the end of the tube 10 can be carried by a worker. It should be noted that the machine has an information system which indicates to the operator when the first product is applied and when he is going to be applying the second layer or other layers of a different nature. Thus, the operator is informed at all times of what he is doing and of the quality of the product he projects.
  • this projection lance 11 is carried and manipulated by means of a robot 30 as shown in FIG. 4.
  • the robot 30 is fixed on a carriage which can move on a raceway 32 extending transversely above the casting distributor 1.
  • This raceway 32 can itself move perpendicular to its direction on two rolling surfaces 33 extending on either side of the casting distributor 1.
  • the robot 30 carries for example articulated arms and / or hydraulic jacks 34, 35, 36, 37 which make it possible to move the spray lance 11 inside the tundish 1, in a vertical plane parallel to the raceway 32.
  • the spray lance 11 can spray the pasty material at any point inside the distributor of casting.
  • the tubular bodies 3, 3a contain a single Archimedean screw 4c, 4d and the end of these bodies has a chute 18b which opens out above a hopper 19d with an inclined or horizontal bottom provided, for example, with a conveyor belt, or a notched disc 41 driven in rotation by a motor 42, or an Archimedes screw 39 driven by a motor 40, which conveys the dry matter in a mixer 43 with screw 44 driven in rotation by a motor 22a.
  • this mixer 43 opens a cold or lukewarm water supply pipe 46 coming from the metering device 8.
  • a balloon of lukewarm water can be interposed between the water inlet 46 and the mixer 43 in order to moisten the solid constituents of each of the above-mentioned mixtures using more or less hot water.
  • the mixer 43 has a vertical shaft which carries a screw and / or mixer blades (s) 45 and which rotates the screw pump 9c which propels the pasty material into the tube 10.
  • the outlet troughs 18c1 and 18c tub of the tubular bodies pour the dry kneaded material into a hopper 19c which overcomes a mixing tank 9b under common pressure into which opens a tube 48 for supplying water from of the metering device 8.
  • the mixing tank contains the mixing blades 51 driven in rotation around their shaft 51a by a motor (not shown).
  • the communication opening between the hopper 19c and the tank 9b comprises a non-return valve or a vane distributor 47.
  • In the tank 9b opens a second conduit 49 connected to a source of compressed air. Under the effect of this pressure, the pasty mixture is propelled into the tube 10.
  • the two hoppers 2, 2a overcome and feed a first single tubular body 3 enclosing a single dosing and kneading Archimedes screw 4.
  • the first single tubular body 3 is extended by a second single tubular body 5 containing a mixing machine screw 6 and or mixing blades 6b.
  • Each of the hoppers 2, 2a has at its base a device for opening and electrically controlled closure 52, 52a, such as, for example, a slide solenoid valve or a vane distributor, to authorize or prohibit the flow of the solid constituent which it contains.
  • the device 52 is in the position authorizing the flow in the cylindrical body 3 of the products contained in the hopper 2
  • the device 52a is in the position preventing the flow in the cylindrical body 3 products contained in the hopper 2a.
  • the installation described in FIG. 7 further comprises a warm water balloon 53 housed inside the metal frame 12 under the tubular bodies 3 and 5.
  • the warm water balloon 53 is connected to a source of cold water (not shown) and to the water dispenser 8. It includes heating means (not shown) for heating and keeping lukewarm the water it contains, and a control cabinet 53a of these heating means.
  • the temperature of lukewarm water is predetermined taking into account the operating conditions of the installation and in particular the temperature prevailing in the workshop and the temperature of the solid constituents of the various layers upon arrival of the bags 16, 16a. above the hoppers 17, 17a.
  • the installation shown in FIG. 8 also comprises a device for rinsing, after use, the equipment receiving and transporting the aqueous pasty mixtures, for collecting the rinsing sludge and for reusing this sludge for the preparation of the aqueous pasty mixtures of the next operation.
  • a pipe 58 is arranged along the inner perimeter of the upper part of the hopper 19 and is connected by a pipe 58a to the water metering device 8.
  • the pipe 58 is pierced with numerous holes which, when the pipe 58 is full of water, give rise to numerous jets of water directed towards the walls of the hopper 19.
  • a hopper 54 for collecting the rinsing sludge is also placed for example inside the chassis 12.
  • hopper 54 At the inside the hopper 54 are arranged blades 57 driven by a motor 57a.
  • the lower part of the hopper 54 is connected to a pump 55 driven by a motor not shown.
  • the pump 55 is connected to the water metering device 8 by a line 56 which makes it possible to inject the sludge contained in the hopper 54 into the water circuit upstream of the flow meter 14, which allows this sludge to be used instead of water for the preparation of the pasty aqueous mixtures of the following operation.
  • the installation is similar to that of FIG. 7 but comprises only one hopper 2 separated for example into at least two parts of hoppers 2b, 2c by a middle partition wall 59.
  • Each of the two parts of hoppers 2b, 2c can be equipped with a cone, respectively 17b, 17c, for piercing the bags such as 16b into which the solid constituents of the various layers are brought.
  • the hopper 2 is equipped at its lower part with an opening and closing device 52b with control which can be electric capable of allowing and preventing the flow in the cylindrical body 3 of the solid constituents contained in each of the two parts of hoppers 2b, 2c.
  • this device occupies one or more intermediate positions allowing the simultaneous flow of the solid constituents contained in the two parts of hoppers according to variable proportions which can be predetermined.
  • the device 52b is in the position allowing the flow of products contained in the hopper part 2c and preventing the flow of products contained in the hopper part 2b.
  • the pasty mixture is continuously introduced into the hopper 19 fitted with a vibrator or vibrating needles 20b which feeds the pump 9 by gravity.
  • This pump 9 propels the pasty mixture into the flexible tubing 10. This mixture is sprayed by the lance 11 inside the tundish 1.
  • FIGS. 4, 5 and 6 The operation of the embodiments of FIGS. 4, 5 and 6 is identical except for the arrival of the humidification water of the various solid mixtures.
  • the water supply can take place in the tubular bodies 5, 5a as in the embodiment of FIG. 1; in this case the hopper 19a, with its mixing blades 39a, allows an additional mixing operation.
  • the motors 20 and 20a are variable speed motors or are fitted with variable speed drives, the installation shown in FIG.
  • FIGS. 5 and 6 for which the supply of water takes place respectively in the mixer 43 and in the tank 9b.
  • the embodiment of FIG. 5 is particularly well suited to continuous operation, while that of FIG. 6 is more suited to discontinuous but very flexible operation, the projection having to be interrupted each time that the tank 9b has to be filled.
  • the device 47 of the valve closure type to allow the passage through the tank 9b of the components retained in the hopper 19c unless of course if the device 47 is a vane distributor; once the constituents in the tank 9b, the quantity of water necessary to give the mixture the desired consistency is introduced into it through the conduit 48: the mixing blades 51 can be actuated continuously or stopped when the tank is filled 9b.
  • the tank is pressurized with compressed air by the air inlet 49. There is therefore a discontinuous operation; but the composition of the mixture can be modified very precisely with each new filling, if desired.
  • a first layer is produced corresponding to the constituent contained for example in the hopper 2, by controlling the opening of the device 52 and keeping the device 52a fitted to the hopper 2a closed.
  • a second layer of different composition corresponding to the constituent contained in the hopper 2a, it suffices to close the device 52, to open the device 52a and to adjust the water flow rate appropriately, if necessary. It can be seen that it is also possible to partially and simultaneously open the two devices 52 and 52a to produce any mixture of the two constituents contained in the hoppers 2 and 2a respectively.
  • lukewarm water can be used instead of cold water, but this does not in any way change the operating mode which is that described above for the embodiment of FIG. 7.
  • the tubular body 5 is cleaned as for the embodiments of FIGS. 1, 4 and 7, maintaining the arrival of water in 7 via line 13, stopping the extraction of solid constituents.
  • Water is then brought into line 58 from the water metering device 8 through line 58a, which causes the formation of numerous jets of water which will clean the walls of the hopper 19.
  • the pump 9 is maintained in service and the projection nozzle 11 mounted at the end of the hose 10 is placed above the hopper 54 to recover and collect the rinsing sludge in this hopper 54. It is ensured that these rinsing sludges are very liquid.
  • the installation and the pump 9 are stopped and the motor 57a which is put into service drives the mixing blades 57 intended to keep the liquid sludge in its state.
  • the pump 55 is started to inject the very liquid sludge through line 56, the water metering device 8 and line 13, by the arrival of water 7 in the tubular body 5 to the place of water.
  • the water dispenser 8 regulates the arrival of very liquid sludge at the requested flow rate as if it were water. This avoids the loss of the products remaining in the cylindrical body 5, the hopper 19, the pump 9 and the hose 10 at the end of the previous operation.
  • a first possibility consists in producing these two layers, according to the method and by means of the installation in accordance with the invention, on the permanent refractory lining of the metallurgical container, which is often made of refractory bricks as shown diagrammatically in FIG. 4.
  • FIG. 10 represents a cross-sectional view of a continuous casting distributor 1.
  • the right half-view represents the external metal casing 60 of this distributor.
  • a number of metal anchor rods 61 are welded to the inner face of the bottom 62 and the side walls 63 of the distributor 1.
  • Each anchor rod 61 is covered with a cap 64 whose function will be explained below.
  • the bottom 62 of the distributor is pierced with at least one hole 65 for pouring the molten metal, and a seat brick 66 is placed above each hole 65.
  • the anchor rods 61 serve to anchor the permanent layers 67 and 68 securely to the bottom 62 and to the side walls 63 of the distributor 1, so as to allow the latter to overturn in order to cause the wear layers 69 and 70 to drop after use. with a view to their replacement in accordance with the invention.
  • the first insulating layer 67 is therefore projected according to the method and by means of the installation in accordance with the invention.
  • This layer can advantageously have the following composition:
  • the caps 64 prevent the heads of the anchor rods 61, which in the arrangement shown have the shape of a carp tail, from being covered by the material of the layer 67 during the production of the latter.
  • the caps 64 also serve to delimit for an operator the thickness X1, X2, X3 to be provided for this layer 67 at different points of the distributor.
  • the caps are removed and deposition is carried out by spraying, still according to the method and by means of the installation in accordance with the invention, of the permanent refractory layer 68 which is a known refractory concrete by himself.
  • Layer 68 can be sprayed immediately after layer 67.
  • the refractory concrete layer 68 is preferably allowed to dry and set before making the two insulating and refractory layers 69 and 70, but the four layers 67, 68, 69 and 70 could be projected one behind the other without interruption or almost without interruption, if necessary, if the constituents of the adjacent layers 68 and 69 are compatible.
  • One could then use for this an installation according to the invention comprising four hoppers or parts of hoppers each containing respectively the solid constituent of one of the layers 67 to 70, or use an installation with two hoppers or parts of hoppers and empty the latter after projection of layers 69 and 70.
  • the two or three hoppers can each be equipped with at least one dosing and mixing screw according to one of the embodiments represented in FIGS. 1, 4, 5 and 6, or each be provided with a device and closing 52 and be served by a single dosing and mixing screw 4 according to one of the embodiments shown in Figures 7 and 8. It is also possible to combine hoppers and / or parts of hoppers by combining the modes of Figures 7 and 9.
  • each of the embodiments shown in FIGS. 1, 4, 5, 6 and 9 can be equipped with a lukewarm water tank 53 provided with the corresponding heating and control means, and / or with a collection and reuse of rinsing sludge.
  • the vibrators 15, 15a, 20b of the hoppers 2, 2a, 19 can be replaced by other means to facilitate the flow of the pulverulent material, such as vibrating needles.
  • the intermediate hopper 19d could be supplied with solid constituents by means of a conveyor belt or pneumatically.
  • the hopper 19, shown in FIG. 1 could be fitted with mixing blades, identical to the blades 57 fitted to the hopper 54 for collecting the rinsing sludge shown in FIG. 8, mounted directly on the drive shaft 38b. of the rotor 21 of the pump 9: these blades would have the effect of facilitating the supply of the pump 9 with a pasty mixture which flows otherwise by gravity, under the action of the vibrator or the needles 20b, from the hopper 19 into the pump 9.
  • each hopper or part of hopper with a rapid emptying device, for example by reversing the direction of rotation of the dosing and kneading screws 4 and recovery of the constituent. solid in a hopper and / or bags, which would allow rapid change of solid component to be projected.
  • each of the layers 67 to 70 can itself be replaced by at least two layers of different particle sizes and / or compositions projected by implementing the process and / or the installation in accordance (s) to the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Nozzles (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
EP88400773A 1987-04-03 1988-03-30 Procédé et installation pour projeter un revêtement isolant et réfractaire multicouche et revêtement ainsi obtenu Expired - Lifetime EP0286513B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88400773T ATE66735T1 (de) 1987-04-03 1988-03-30 Verfahren und vorrichtung zum anbringen einer isolierenden mehrlagigen feuerfesten zustellung und zustellung.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8704694 1987-04-03
FR8704694A FR2613256B1 (fr) 1987-04-03 1987-04-03 Procede et installation pour projeter un revetement isolant et refractaire multicouche et revetement ainsi obtenu
FR878711466A FR2619323B2 (fr) 1987-04-03 1987-08-12 Procede et installation pour projeter un revetement isolant et refractaire multicouche et revetement ainsi obtenu
FR8711466 1987-08-12

Publications (2)

Publication Number Publication Date
EP0286513A1 EP0286513A1 (fr) 1988-10-12
EP0286513B1 true EP0286513B1 (fr) 1991-08-28

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Application Number Title Priority Date Filing Date
EP88400773A Expired - Lifetime EP0286513B1 (fr) 1987-04-03 1988-03-30 Procédé et installation pour projeter un revêtement isolant et réfractaire multicouche et revêtement ainsi obtenu

Country Status (10)

Country Link
US (1) US4908234A (enrdf_load_stackoverflow)
EP (1) EP0286513B1 (enrdf_load_stackoverflow)
JP (2) JPS6414589A (enrdf_load_stackoverflow)
KR (1) KR920004475B1 (enrdf_load_stackoverflow)
AU (1) AU598356B2 (enrdf_load_stackoverflow)
CA (1) CA1282651C (enrdf_load_stackoverflow)
DE (1) DE3864435D1 (enrdf_load_stackoverflow)
ES (1) ES2024034B3 (enrdf_load_stackoverflow)
FR (1) FR2619323B2 (enrdf_load_stackoverflow)
GR (1) GR3003228T3 (enrdf_load_stackoverflow)

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DE3864435D1 (de) 1991-10-02
FR2619323A2 (fr) 1989-02-17
CA1282651C (en) 1991-04-09
FR2619323B2 (fr) 1989-12-29
AU598356B2 (en) 1990-06-21
GR3003228T3 (en) 1993-02-17
ES2024034B3 (es) 1992-02-16
AU1408688A (en) 1988-10-06
US4908234A (en) 1990-03-13
JPH0373899U (enrdf_load_stackoverflow) 1991-07-25
JPS6414589A (en) 1989-01-18
KR920004475B1 (ko) 1992-06-05
KR880012972A (ko) 1988-11-29
EP0286513A1 (fr) 1988-10-12

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