WO2009115749A2 - Process and plant for manufacturing a foaming slag activator from rubber waste - Google Patents
Process and plant for manufacturing a foaming slag activator from rubber waste Download PDFInfo
- Publication number
- WO2009115749A2 WO2009115749A2 PCT/FR2009/050375 FR2009050375W WO2009115749A2 WO 2009115749 A2 WO2009115749 A2 WO 2009115749A2 FR 2009050375 W FR2009050375 W FR 2009050375W WO 2009115749 A2 WO2009115749 A2 WO 2009115749A2
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- WO
- WIPO (PCT)
- Prior art keywords
- station
- thermolysis
- activator
- waste
- magnesium compound
- 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.)
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Classifications
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- 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
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/54—Processes yielding slags of special composition
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B47/00—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
- C10B47/28—Other processes
- C10B47/32—Other processes in ovens with mechanical conveying means
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/07—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of solid raw materials consisting of synthetic polymeric materials, e.g. tyres
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- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
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- 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
- C21C2300/00—Process aspects
- C21C2300/02—Foam creation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
- Y02P20/143—Feedstock the feedstock being recycled material, e.g. plastics
Definitions
- the present invention relates to a method of manufacturing a slag activator and an activator obtained by the method, it also relates to an installation for implementing the method.
- This activator has its application in steel mills for the activation of slag and in particular but not limited to foaming slag.
- the slag consists mainly of lime, alumina, silica, iron oxide and magnesia, magnesia being a chemical need for the slag, and the other constituents being supplied by scrap or by the process. It is common practice to add magnesia to saturate the slag so that it does not draw its need for magnesia in the furnace refractory lining, and to avoid premature wear of the walls.
- magnesia also has the effect of modifying the viscosity of the slag and promoting the foaming thereof, a condition necessary for good ripening.
- foaming slag technique reference may be made to patent FR 2 634 787 which is in the public domain.
- magnesium supply techniques for example: introduction of crushed refractory magnesia bricks, addition of dolomitic lime, use of magnesium carbonate, use of a caustic magnesia compound and carbon proposed in the form of briquettes.
- magnesium carbonate (Mg CO 3 ) is a widespread technique: magnesium carbonate is introduced into the furnace where it decomposes into carbon dioxide (CO 2 ) and caustic magnesia (MgO) which is perfectly soluble in contact with dairy.
- CO 2 carbon dioxide
- MgO caustic magnesia
- the prior art also knows a slag activator marketed in the form of briquettes composed of calcined magnesia, carbon in the form of graphite, and a binder.
- the briquettes introduction phase can not be carried out at the opportune moment, which is especially desired before and during the refining of the slag.
- the briquettes can be introduced only during the melting cycle of the baskets which causes a loss of efficiency foaming.
- This problem has been solved by presenting an injectable product in the form of granules, but its density is much greater than that of the injection carbon in the furnace and does not mix satisfactorily with it. The difference in density between the components of the product does not make it possible to obtain a homogeneous mixture after transporting the fluid.
- Another disadvantage of the presentation of the briquette activator is that it generates a response time proportional to the briquette format.
- the invention aims to find an activator that does not have the aforementioned drawbacks and whose manufacturing costs would be independent of increases in the prices of raw materials and their transport.
- the applicant has had the idea of implementing an activator from recovered materials and was particularly interested in the recovery of used tires and other rubber products such as used conveyor belts, waste from the manufacture of rubber products such as seals or others.
- the invention consists in a process for manufacturing a foaming slag activator characterized in that it consists in treating by thermolysis a mixture of rubberized and shredded waste (B) and a magnesium compound (A), a mixture carried at a temperature between 400 ° and 700 °, then to screen the product obtained (m) to extract the metal residues and obtain a slag activator (n) in powder form.
- rubberized waste refers mainly to used and shredded tires, but also to any other residue of product manufacture made from natural rubber, and the term “magnesium compound” means magnesium carbonate MgCO 3 or caustic MgO.
- magnesium compound means magnesium carbonate MgCO 3 or caustic MgO.
- thermolysis of waste is a method known per se, which consists of burning waste in a furnace called thermolyser, without flame in the absence of oxygen at a temperature between 350 and 750 ° C.
- the method according to the invention ⁇ nsistes to treat by thermolysis in a thermolyseur (1) a mixture of shredded tires and magnesium carbonate in a system shown schematically in the figure.
- the reaction is preferably carried out at a temperature of 440 ° to 550 ° C. At this temperature:
- thermolysis station (3) a thermolysis station (3), a screening station (4), a fuel supply station (9).
- the installation can be completed by at least one of the following stations: a shaping station (5), a dust recovery station (7), a flue gas treatment station (6), a catchment station and gas recycling (8).
- a thermolyser (t) The products entering a thermolyser (t) are added together in a hopper (g) and then conducted in the thermolyser (t) by an Archimedean screw (h) or other pusher means such as a jack for example.
- the incoming products are on the one hand magnesium carbonate (A) and shredded tires (B) (B1 or B2). These shredded tires are either supplied directly shredded (c) from a supply hopper (f) or supplied whole (a ') and shredded on site in a shredder (a) and from a hopper (d).
- the shredder can be fixed or movable step by step depending on the storage location on the site of the facility or movable to another collection site.
- the magnesium carbonate (A) is supplied as a powder (b) in a supply hopper (e) or equivalent means.
- the Archimedean screw (h) or equivalent pushes the burning bed (f) through the oven (t), the reaction time is about 30 minutes for a bed temperature (f) of about 500 ° C. at the oven outlet (ie 500 ° C ⁇ 60 ° C).
- the product (m) leaving the furnace is a mixture of magnesia and carbon in powder form, various ashes, and ferrous residues from the tire carcasses.
- the gases (i) resulting from the thermolysis have an energy value close to that of the town gas, they are preferably recovered and reintroduced into the burner (j) and thus reused for heating the oven, in addition to and / or replacing the town gas in the case where the burner is a gas burner.
- the product (m) is conducted by gravity in a screening device to separate the ferrous residues (u).
- the product (n) from the screening is in the form of a homogeneous powder composed of magnesia, carbon, and ash.
- the product (n) can according to a first option be sold to the steel companies directly without further treatment in the form of this powder for introduction into arc furnaces to promote the foaming slag for example by means of an injection rod foaming charcoal when present.
- the product (n) can be driven by a conveyor belt to an inlet hopper (o) of a mixer (r) where it is bonded to an organic binder supplied in the mixer by another hopper (q). ), in order to be able to shape it into grains and to produce an activator of predetermined granulometry (s) and delivered in bag or in bulk.
- the step of mixing the product (n) with an organic binder has the function of homogenizing the density of the activator and facilitating its injection into the slag by imparting to the activator a density close to that slag.
- the product (n) or (s) has a determined percentage of carbon and caustic magnesia, and at most 0.5% of sulfur as well as dispersed ash (in a proportion of less than 5%).
- magnesium carbonate (A) in powder form constitutes 20 to 70% of the initial charge of the hopper (g).
- a product (n) having from 20 to 80% of carbon and from 80 to 20% of magnesia is obtained.
- composition of the residues of the tires used by the thermolysis of 30 minutes at 500 ° C. is given in the following table:
- thermolysis gas 500 ° C.
- provision may be made to replace the supply of magnesium carbonate in the hopper A by adding caustic magnesia.
- An important advantage of the process is to obtain an activator in powder form where the essential components namely carbon and magnesia are perfectly mixed.
- the activator can thus be easily introduced into the slag regardless of the configuration of the slag melting furnace.
- the invention also aims to protect all the process installation of the process and the product obtained.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
Description
Procédé et installation de fabrication d'un activateur de laitier moussant à partir de déchets caoutchoutés Process and installation for manufacturing a foaming slag activator from rubberized waste
La présente invention concerne un procédé de fabrication d'un activateur de laitier et un activateur obtenu par le procédé, elle concerne également une installation de mise en oeuvre du procédé.The present invention relates to a method of manufacturing a slag activator and an activator obtained by the method, it also relates to an installation for implementing the method.
Cet activateur voit son application dans les aciéries pour l'activation du laitier et en particulier mais non limitativement du laitier moussant.This activator has its application in steel mills for the activation of slag and in particular but not limited to foaming slag.
L'injection de carbone et d'oxygène en métallurgie au moment de l'affinage pour obtenir un laitier moussant abondant est une technique connue dans l'élaboration de l'acier dans des fours électriques à arc.The injection of carbon and oxygen in metallurgy at the time of refining to obtain an abundant foaming slag is a known technique in the production of steel in electric arc furnaces.
Le laitier est principalement constitué de chaux, alumine, silice, oxyde de fer et magnésie, la magnésie étant un besoin chimique du laitier, et les autres constituants étant apportés par les ferrailles ou par le procédé. II est de technique courante d'apporter de la magnésie pour saturer le laitier afin que celui-ci ne puise pas ses besoins en magnésie dans le garnissage intérieur réfractaire du four, et afin d'éviter une usure prématurée des parois.The slag consists mainly of lime, alumina, silica, iron oxide and magnesia, magnesia being a chemical need for the slag, and the other constituents being supplied by scrap or by the process. It is common practice to add magnesia to saturate the slag so that it does not draw its need for magnesia in the furnace refractory lining, and to avoid premature wear of the walls.
L'apport de magnésie a également pour conséquence de modifier la viscosité du laitier et d'en favoriser le moussage, condition nécessaire à un bon affinage. A titre d'exemple de la technique du laitier moussant on peut se reporter au brevet FR 2 634 787 qui est dans le domaine public.The addition of magnesia also has the effect of modifying the viscosity of the slag and promoting the foaming thereof, a condition necessary for good ripening. As an example of the foaming slag technique, reference may be made to patent FR 2 634 787 which is in the public domain.
Différentes techniques d'apport de magnésie sont connues par exemple : introduction de briques de magnésie réfractaire broyées, addition de chaux dolomitique, utilisation de carbonate de magnésium, utilisation d'un composé de magnésie caustique et de carbone proposé sous forme de briquettes.Various magnesium supply techniques are known for example: introduction of crushed refractory magnesia bricks, addition of dolomitic lime, use of magnesium carbonate, use of a caustic magnesia compound and carbon proposed in the form of briquettes.
L'utilisation du carbonate de magnésium (Mg CO3) est une technique répandue : le carbonate de magnésium est introduit dans le four où il se décompose en dioxyde de carbone (CO2) et en magnésie (MgO) caustique parfaitement soluble au contact du laitier. L'évolution du coût du pétrole et du coût de transport rendent l'importation du carbonate de magnésium de plus en plus coûteuse et rendront à l'avenir son utilisation économiquement difficile, d'autant plus que sa perte au feu correspond à la moitié de son poids.The use of magnesium carbonate (Mg CO 3 ) is a widespread technique: magnesium carbonate is introduced into the furnace where it decomposes into carbon dioxide (CO 2 ) and caustic magnesia (MgO) which is perfectly soluble in contact with dairy. The evolution of the cost of oil and the cost of transport make the import of magnesium carbonate increasingly expensive and will make its use economically difficult in the future, especially as its loss on fire is half of his weight.
L'art antérieur connaît également un activateur de laitier commercialisé sous forme de briquettes composées de magnésie calcinée, de carbone sous forme de graphite, et d'un liant. Pour des raisons techniques liées aux infrastructures de certaines aciéries, la phase d'introduction des briquettes ne peut être réalisée au moment opportun qui est surtout désirée avant et durant l'affinage du laitier.The prior art also knows a slag activator marketed in the form of briquettes composed of calcined magnesia, carbon in the form of graphite, and a binder. For technical reasons related to the infrastructure of some steel mills, the briquettes introduction phase can not be carried out at the opportune moment, which is especially desired before and during the refining of the slag.
En effet les briquettes ne peuvent être introduites uniquement pendant le cycle de fusion des paniers ce qui engendre une perte d'efficacité du moussage. On a cherché à résoudre ce problème en présentant un produit injectable sous forme de granulés, mais sa densité est largement supérieure à celle du carbone d'injection dans le four et ne se mélange pas de façon satisfaisante avec lui. La différence de densité entre les composants du produit ne permet pas l'obtention d'un mélange homogène après transport de fluide.Indeed the briquettes can be introduced only during the melting cycle of the baskets which causes a loss of efficiency foaming. This problem has been solved by presenting an injectable product in the form of granules, but its density is much greater than that of the injection carbon in the furnace and does not mix satisfactorily with it. The difference in density between the components of the product does not make it possible to obtain a homogeneous mixture after transporting the fluid.
Un autre inconvénient de la présentation de l'activateur en briquettes est qu'elle engendre un temps de réponse proportionnel au format des briquettes.Another disadvantage of the presentation of the briquette activator is that it generates a response time proportional to the briquette format.
L'invention vise à trouver un activateur qui ne présenterait pas les inconvénients précités et dont les coûts de fabrication seraient indépendants des augmentations des prix des matières premières et de leur transport.The invention aims to find an activator that does not have the aforementioned drawbacks and whose manufacturing costs would be independent of increases in the prices of raw materials and their transport.
La demanderesse a eu l'idée de mettre en oeuvre un activateur à partir de matériaux récupérés et s'est intéressée en particulier à la récupération des pneus usagés et autres produits caoutchoutés comme les bandes transporteuses usagées, les déchets issus de la fabrication de produits caoutchoutés tels que des joints ou autres. L'invention consiste en un procédé de fabrication d'un activateur de laitier moussant caractérisé en ce qu'il consiste à traiter par thermolyse un mélange de déchets caoutchoutés et déchiquetés (B) et d'un composé de magnésium (A), mélange porté à une température comprise entre 400° à 700°, puis à cribler le produit obtenu (m) pour en extraire les résidus métalliques et obtenir un activateur de laitier (n) sous forme de poudre.The applicant has had the idea of implementing an activator from recovered materials and was particularly interested in the recovery of used tires and other rubber products such as used conveyor belts, waste from the manufacture of rubber products such as seals or others. The invention consists in a process for manufacturing a foaming slag activator characterized in that it consists in treating by thermolysis a mixture of rubberized and shredded waste (B) and a magnesium compound (A), a mixture carried at a temperature between 400 ° and 700 °, then to screen the product obtained (m) to extract the metal residues and obtain a slag activator (n) in powder form.
Par déchets caoutchoutés on entend principalement des pneus usagés et déchiquetés mais aussi tout autre résidu de fabrication de produit fabriqué à partir de caoutchouc naturel, et on entend par composé de magnésium le carbonate de magnésium Mg CO3 ou la magnésie caustique MgO. On comprendra mieux l'invention à l'aide de la description ci-après faite en référence à la figure unique annexée, qui est une représentation schématique d'une installation préférée de mise en oeuvre du procédé de fabrication de l'activateur selon l'invention.The term "rubberized waste" refers mainly to used and shredded tires, but also to any other residue of product manufacture made from natural rubber, and the term "magnesium compound" means magnesium carbonate MgCO 3 or caustic MgO. The invention will be better understood from the following description given with reference to the single appended figure, which is a diagrammatic representation of a preferred installation for implementing the method of manufacturing the activator according to the invention. invention.
La thermolyse de déchets est un procédé connu en soi, qui consiste à brûler des déchets dans un four appelé thermolyseur, sans flamme en absence d'oxygène à une température comprise entre 350 et 750° C. Le procédé selon l'invention ∞nsiste à traiter par thermolyse dans un thermolyseur (1 ) un mélange de pneus déchiquetés et de carbonate de magnésium dans une installation schématisée sur la figure.The thermolysis of waste is a method known per se, which consists of burning waste in a furnace called thermolyser, without flame in the absence of oxygen at a temperature between 350 and 750 ° C. The method according to the invention ∞nsistes to treat by thermolysis in a thermolyseur (1) a mixture of shredded tires and magnesium carbonate in a system shown schematically in the figure.
La réaction est préférentiellement réalisée à une température de 440° à 550° C. A cette température :The reaction is preferably carried out at a temperature of 440 ° to 550 ° C. At this temperature:
- le carbonate de magnésium donne de la magnésie et du dioxyde de carbone- magnesium carbonate gives magnesia and carbon dioxide
Mg CO3 O MgO + CO2 Mg CO 3 O MgO + CO 2
et les pneus usagés brûlent pour donner du carbone, et différents composés gazeux et des résidus solides notamment des cendres diverses et des résidus métalliques provenant des carcasses de pneus. On note que le soufre contenu dans le caoutchouc des pneus est transformé à 80 % en composé gazeux, soit sous forme de vapeur de soufre car sa température de vaporisation est de 444,6° soit par combinaison avec l'hydrogène pour donner H2S gazeux.and used tires burn to give carbon, and various gaseous compounds and solid residues including various ashes and metal residues from tire carcasses. It is noted that the sulfur contained in the tire rubber is converted to 80% gaseous compound, either in the form of sulfur vapor because its vaporization temperature is 444.6 ° or by combination with hydrogen to give H 2 S gaseous.
Une installation de mise en oeuvre du procédé selon la figure et donnée à titre d'exemple non limitatif et se compose de : une station d'approvisionnement de magnésieAn installation for carrying out the process according to the figure and given by way of non-limiting example and consists of: a magnesia supply station
(2), une station de déchiquetage de pneus (1 '), et/ou une station de pneus déchiquetés(2), a tire shredding station (1 '), and / or a shredded tire station
(1 ), une station de thermolyse (3), une station de criblage (4), une station d'alimentation en combustible (9).(1), a thermolysis station (3), a screening station (4), a fuel supply station (9).
Optionnellement l'installation peut être complétée par au moins une des stations suivantes : une station de mise en forme (5), une station de valorisation de poussières (7), une station d'épuration des fumées (6), une station de captage et de recyclage des gaz (8). Les produits entrants dans un thermolyseur (t) sont additionnés ensemble dans une trémie (g) puis conduits dans le thermolyseur (t) par une vis d'Archimède (h) ou un autre moyen pousseur comme un vérin par exemple.Optionally the installation can be completed by at least one of the following stations: a shaping station (5), a dust recovery station (7), a flue gas treatment station (6), a catchment station and gas recycling (8). The products entering a thermolyser (t) are added together in a hopper (g) and then conducted in the thermolyser (t) by an Archimedean screw (h) or other pusher means such as a jack for example.
Les produits entrants sont d'une part du carbonate de magnésium (A) et des pneus déchiquetés (B) (B1 ou B2). Ces pneus déchiquetés sont soit approvisionnés directement déchiquetés (c) depuis une trémie d'approvisionnement (f) soit approvisionnés entiers (a') et déchiquetés sur place dans un déchiqueteur (a) et depuis une trémie (d). Le déchiqueteur peut être fixe ou bien déplaçable pas à pas en fonction du lieu de stockage sur le site de l'installation ou bien déplaçable sur un autre site de collecte. Le carbonate de magnésium (A) est apporté sous forme de poudre (b) dans une trémie d'approvisionnement (e) ou dans un moyen équivalent. La vis d'Archimède (h) ou équivalent pousse le lit en combustion (f) à travers le four (t), la durée de réaction est d'environ 30 mn pour une température du lit (f) d'environ 500° C en sortie de four (soit 500° C ± 60 ° C).The incoming products are on the one hand magnesium carbonate (A) and shredded tires (B) (B1 or B2). These shredded tires are either supplied directly shredded (c) from a supply hopper (f) or supplied whole (a ') and shredded on site in a shredder (a) and from a hopper (d). The shredder can be fixed or movable step by step depending on the storage location on the site of the facility or movable to another collection site. The magnesium carbonate (A) is supplied as a powder (b) in a supply hopper (e) or equivalent means. The Archimedean screw (h) or equivalent pushes the burning bed (f) through the oven (t), the reaction time is about 30 minutes for a bed temperature (f) of about 500 ° C. at the oven outlet (ie 500 ° C ± 60 ° C).
Le produit (m) sortant du four est un mélange de magnésie et de carbone sous forme de poudre, de diverses cendres, et de résidus ferreux provenant des carcasses de pneus.The product (m) leaving the furnace is a mixture of magnesia and carbon in powder form, various ashes, and ferrous residues from the tire carcasses.
Les gaz (i) issus de la thermolyse ont une valeur énergétique proche de celle du gaz de ville, ils sont de préférence récupérés et réintroduits dans le brûleur (j) et ainsi réutilisés pour le chauffage du four, en complément et/ou remplacement du gaz de ville dans le cas où le brûleur est un brûleur à gaz.The gases (i) resulting from the thermolysis have an energy value close to that of the town gas, they are preferably recovered and reintroduced into the burner (j) and thus reused for heating the oven, in addition to and / or replacing the town gas in the case where the burner is a gas burner.
Le produit (m) est conduit par gravité dans un dispositif de criblage afin de séparer les résidus ferreux (u). Le produit (n) issu du criblage se présente sous forme d'une poudre homogène composée de magnésie, carbone, et cendres.The product (m) is conducted by gravity in a screening device to separate the ferrous residues (u). The product (n) from the screening is in the form of a homogeneous powder composed of magnesia, carbon, and ash.
Le produit (n) peut selon une première option être vendu aux entreprises sidérurgiques directement sans autre traitement sous forme de cette poudre afin d'être introduit dans les fours à arc pour favoriser le laitier moussant par exemple au moyen d'une canne d'injection de charbon moussant quand elle est présente.The product (n) can according to a first option be sold to the steel companies directly without further treatment in the form of this powder for introduction into arc furnaces to promote the foaming slag for example by means of an injection rod foaming charcoal when present.
Selon une deuxième option le produit (n) peut être conduit par une bande transporteuse vers une trémie d'entrée (o) d' un mélangeur (r) où il est lié à un liant organique approvisionné dans le mélangeur par une autre trémie (q), afin de pouvoir le façonner en grains et de produire un activateur de granulométrie prédéterminée (s) et délivré en sac ou en vrac.According to a second option, the product (n) can be driven by a conveyor belt to an inlet hopper (o) of a mixer (r) where it is bonded to an organic binder supplied in the mixer by another hopper (q). ), in order to be able to shape it into grains and to produce an activator of predetermined granulometry (s) and delivered in bag or in bulk.
L'étape de mélange du produit (n) avec un liant organique (huile par exemple) a pour fonction d'homogénéiser la densité de l'activateur et de faciliter son injection dans le laitier en conférant à l'activateur une densité proche de celle du laitier.The step of mixing the product (n) with an organic binder (oil for example) has the function of homogenizing the density of the activator and facilitating its injection into the slag by imparting to the activator a density close to that slag.
Le produit (n) ou (s) comporte un pourcentage déterminé en carbone et magnésie caustique, et au plus 0,5 % de soufre ainsi que des cendres dispersées (en proportion inférieure à 5 %).The product (n) or (s) has a determined percentage of carbon and caustic magnesia, and at most 0.5% of sulfur as well as dispersed ash (in a proportion of less than 5%).
A titre d'exemples préférés mais non limitatifs, on donne les indications suivantes :As preferred but nonlimiting examples, the following indications are given:
- les pneus (B1) ou (B2) déchiquetés grossièrement en morceaux de 10 cm X 10 cm environ et constituent 30 à 80 % de la charge initiale de la trémie (g) d'alimentation du thermolyseur.- Tires (B 1 ) or (B 2 ) roughly shredded into pieces of about 10 cm X 10 cm and constitute 30 to 80% of the initial charge of the hopper (g) feeding the thermolyser.
- le carbonate de magnésium (A) sous forme de poudre constitue 20 à 70 % de la charge initiale de la trémie (g).magnesium carbonate (A) in powder form constitutes 20 to 70% of the initial charge of the hopper (g).
- selon les proportions des produits entrant (A) et (B), on obtient un produit (n) comportant de 20 à 80 % de carbone et de 80 à 20 % de magnésie. On peut aussi modifier la teneur en magnésie en fonction de la demande du client en ajoutant de la magnésie caustique au produit (n) en fin de processus d'élaboration.according to the proportions of the products entering (A) and (B), a product (n) having from 20 to 80% of carbon and from 80 to 20% of magnesia is obtained. Can also modify the magnesia content according to the customer's demand by adding caustic magnesia to the product (n) at the end of the elaboration process.
La composition des résidus des pneumatiques usagés par la thermolyse de 30 mn à 500° C est donnée dans le tableau suivant :The composition of the residues of the tires used by the thermolysis of 30 minutes at 500 ° C. is given in the following table:
La composition du gaz de thermolyse à 500 0C est donnée dans le tableau suivant :The composition of the thermolysis gas at 500 ° C. is given in the following table:
Les teneurs indiquées dans les tableaux ci-dessus peuvent varier en fonction de la durée et de la température de thermolyse qui peut être réalisée dans une fourchette de 350° àThe contents indicated in the tables above can vary according to the duration and the temperature of thermolysis which can be carried out in a range of 350 ° to
700° C.700 ° C.
En variante du procédé, on peut prévoir de remplacer l'apport de carbonate de magnésium dans la trémie A par un apport de magnésie caustique.As an alternative to the method, provision may be made to replace the supply of magnesium carbonate in the hopper A by adding caustic magnesia.
Un avantage important du procédé est d'obtenir un activateur sous forme de poudre où les composants essentiels à savoir carbone et magnésie sont parfaitement mélangés.An important advantage of the process is to obtain an activator in powder form where the essential components namely carbon and magnesia are perfectly mixed.
L'activateur peut donc être facilement introduit dans le laitier quelque soit la configuration du four de fusion du laitier.The activator can thus be easily introduced into the slag regardless of the configuration of the slag melting furnace.
Un autre avantage important est la valorisation des déchets caoutchoutés et notamment des pneus usagés. L'invention vise également à protéger toutes les installations de mise en eouvre du procédé ainsi que le produit obtenu. Another important advantage is the recovery of rubberized waste and especially used tires. The invention also aims to protect all the process installation of the process and the product obtained.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0851558A FR2928660A1 (en) | 2008-03-11 | 2008-03-11 | METHOD AND APPARATUS FOR MANUFACTURING FOAMING DAIRY ACTIVATOR FROM RUBBER WASTE |
| FR0851558 | 2008-03-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2009115749A2 true WO2009115749A2 (en) | 2009-09-24 |
| WO2009115749A3 WO2009115749A3 (en) | 2009-11-12 |
Family
ID=39929585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2009/050375 Ceased WO2009115749A2 (en) | 2008-03-11 | 2009-03-09 | Process and plant for manufacturing a foaming slag activator from rubber waste |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR2928660A1 (en) |
| WO (1) | WO2009115749A2 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3849117A (en) * | 1968-10-07 | 1974-11-19 | Foseco Int | Treatment of slags covering molten metals |
| FR2449521A1 (en) * | 1979-02-21 | 1980-09-19 | Gagneraud Francis | PROCESS FOR THERMAL DECOMPOSITION OF RUBBER MATERIALS |
| LU81606A1 (en) * | 1979-08-14 | 1981-03-24 | Arbed | METHOD AND DEVICE FOR THE RECYCLING OF CARBON-RICH WASTE PRODUCTS |
| JPS59133309A (en) * | 1983-01-20 | 1984-07-31 | Nippon Steel Corp | Method for inhibiting foaming in refining furnace |
| FR2634787B1 (en) * | 1988-08-01 | 1991-11-29 | Siderurgie Fse Inst Rech | PROCESS FOR OBTAINING A FOAMING SLAG IN AN ELECTRIC STEEL FURNACE |
-
2008
- 2008-03-11 FR FR0851558A patent/FR2928660A1/en active Pending
-
2009
- 2009-03-09 WO PCT/FR2009/050375 patent/WO2009115749A2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009115749A3 (en) | 2009-11-12 |
| FR2928660A1 (en) | 2009-09-18 |
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