WO2020122701A1 - Method for producing briquettes from pellet fines, dri sludge, dri fines and dust from dri dedusting systems, for industrial use in direct-reduced iron production processes - Google Patents

Method for producing briquettes from pellet fines, dri sludge, dri fines and dust from dri dedusting systems, for industrial use in direct-reduced iron production processes Download PDF

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Publication number
WO2020122701A1
WO2020122701A1 PCT/MX2018/050029 MX2018050029W WO2020122701A1 WO 2020122701 A1 WO2020122701 A1 WO 2020122701A1 MX 2018050029 W MX2018050029 W MX 2018050029W WO 2020122701 A1 WO2020122701 A1 WO 2020122701A1
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Prior art keywords
dri
fines
briquettes
pellet
sludge
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PCT/MX2018/050029
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Spanish (es)
French (fr)
Inventor
Francisco Ramirez
Original Assignee
Jesus R Cuauro Pulgar
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Application filed by Jesus R Cuauro Pulgar filed Critical Jesus R Cuauro Pulgar
Priority to PCT/MX2018/050029 priority Critical patent/WO2020122701A1/en
Priority to CN201880100650.XA priority patent/CN113366128A/en
Publication of WO2020122701A1 publication Critical patent/WO2020122701A1/en

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating

Definitions

  • the briquetting process consists of compression agglomeration of the materials through the use of roller presses in which depending on the characteristics of the materials it will be necessary to use binders that help to form a briquette that meets the appropriate resistance characteristics for its handling in subsequent processes.
  • the dimensions and shape of the briquette also depend on the end use that will be given.
  • Patent with registration number EP 1425427 A4 which describes a method to produce cooked briquettes to be used as a charge in Blast Furnaces or Direct Reduction Furnaces from the mixture of hydrated iron ore and fluxes, being the mineral of iron preferably Goethite and fluxes preferably limestone which makes the difference from the present invention where pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems are used and no limestone is added.
  • the firing of the briquettes of the referred patent is to harden them and facilitate their use by using firing furnaces with temperatures of at least 1200 ° C and more preferably at least 1380 ° C for at least 15 minutes, which makes the difference with With respect to the present invention, where the briquette hardening is achieved with a cure at room temperature.
  • Patent US 2865731 A in which a method is described for producing cylindrical briquettes with a hydraulic piston from iron ore and paper pulp as a binder, the iron ore being hematite flotation concentrates which makes the difference with respect to The present invention wherein pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems are used using inorganic binders to form the roll press briquette.
  • US patent 2012/0210824 Al in which it is described describes a method for producing cold-cured agglomerates in the form of pellets or micro-pellets in a pelletizing disk or drum from iron minerals with fine particle size preferably 80% below 325 mesh or also using by-products from the steel industry such as EAF and BOF powders, sinter feed or sinter fines, or iron ore concentrate fines using portland cement or clinker or binders as binder organic as acrylamides or carboxymethylcelluloses and having as final use for micro-pellets sintering plants and for pellets the Blast Furnaces, which makes the difference with respect to the present invention where briquettes are manufactured from pellet fines, DRI sludge , DRI fines and DRI dedusting system powders on roller presses using bentonite and liquid sodium silicate as binder and having as use end for briquette direct reduction plants.
  • Figure 1 refers to the flow diagram of the process for obtaining briquettes from pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems.
  • the present invention relates to a process for manufacturing briquettes from the following by-products from the steel industry;
  • Pellet fines Obtained from the screening of the iron oxide pellets that are used as cargo to the Blast Furnaces or Direct Reduction reactors.
  • DRI sludge Obtained from the dust collection systems by gas scrubbing of the feed zone and the reaction zone in Direct Reduction reactors.
  • DRI fines Obtained from the screening of Direct Reduction Iron (DRI).
  • the end use of the briquettes is to partially replace the iron oxide pellet charge in both HyL and Midrex Direct Reduction reactors with their physical, chemical and metallurgical characteristics for the final production of Direct Reduction iron (DRI) and comprising the following stages; a) Screening and crushing of pellet fines
  • Pellet fines are screened by a 1/8 inch (3.17 mm) opening size mesh to obtain particles of primary pellet fines smaller than 1/8 inch (3.17mm) size, which are placed on a conveyor belt, and pellet fines particles larger than 1/8 inch (3.17 mm) in size are crushed by using a preferably jaw crusher (1) to obtain secondary pellet fines particles with sizes smaller than 1/8 inch (3.17 mm) which are subsequently placed together with the primary pellet fines particles smaller than 1/8 inch (3.17 mm) in the conveyor belt and obtain final pellet fines particles with sizes less than 1/8 inch (3.17 mm) b) DRI sludge screening and crushing
  • DRI sludge which with humidity less than 10% and preferably less than 5% is screened by a mesh with opening size of 1/8 inch (3.17 mm) to obtain primary DRI sludge particles smaller than one size 1/8 inch (3.17mm), which are placed on a conveyor belt, and DRI sludge particles larger than 1/8 inch (3.17 mm) size are shredded using a preferably jaw crusher (2) to obtain secondary DRI sludge particles smaller than 1/8 inch (3.17 mm) which are subsequently placed together with the primary DRI sludge particles smaller than 1/8 inch ( 3.17 mm) on the conveyor belt and obtain final DRI sludge particles smaller than 1/8 inch (3.17 mm) in size c) DRI fine screening
  • the DRI fines are a material that has already gone through a screening process in the plant that generates them and, to guarantee uniformity in size, they are again screened by a mesh (3) with an opening size of 1/4 inch (6.34). mm) to obtain final DRI fines particles smaller than 1/4 inch (6.34 mm) in size, which are placed on a conveyor belt for use in the briquetting process, and larger DRI fines particles At a size of 1/4 inch (6.34 mm) they are set aside for use as-is as load a in Electric Steel Mill furnaces. d) Dust storage from DRI dedusting systems
  • Powders from DRI dedusting systems are stored in hoppers or silos (4) so that they can be used in the briquetting process by means of a dosing system.
  • Final particles of pellet fines smaller than 1/8 inch, from DRI sludge smaller than 1/8 inch, from DRI fines smaller than 1/4 inch and dust from DRI dusts are mixed with liquid and powder binders, preferably 1 to 12% for liquid sodium silicate (5) and preferably 1 to 10% for bentonite powder (6), and with water (7 ) necessary to obtain adequate humidity in a mixer, preferably in a horizontal double-shaft mixer (8), to obtain a final mixture to be used in the briquetting stage.
  • liquid and powder binders preferably 1 to 12% for liquid sodium silicate (5) and preferably 1 to 10% for bentonite powder (6)
  • water (7 ) necessary to obtain adequate humidity in a mixer, preferably in a horizontal double-shaft mixer (8), to obtain a final mixture to be used in the briquetting stage.
  • the combination of these liquid and powder binders provides the produced briquette with the porosity and physical strength characteristics necessary for favorable performance in both HyL and Midrex Direct Reduction reactors.
  • pellet fines smaller than 1/8 inch and DRI sludge smaller than 1/8 inch are mixed in proportions from 10% pellet fines-90% DRI sludge up to 90 % fine pellets- 10% DRI sludge with liquid and powder binders to obtain a final mix to be used in the briquetting stage
  • composite Portland cement is used as a binder, preferably from 1 to 10% instead of powdered bentonite.
  • the final mixture obtained is passed to a feeding hopper of a roller press (9) to be briquetted with a specific compression force by means of a system of hydraulic pistons, preferably 0-147 kN / linear cm of roller (equivalent to 0- 15 ton / linear roller cm) and thus obtain fresh spheroidal briquettes, preferably with a diameter that is somewhat wider than 3.2 cm and with a volume preferably less than 7.5 cm3.
  • a system of hydraulic pistons preferably 0-147 kN / linear cm of roller (equivalent to 0- 15 ton / linear roller cm)
  • Fresh spheroidal briquettes pass a 1-inch, single bed, inclined vibrating screen (10) to remove edges and residue from fresh briquettes smaller than 1/4 inch (6.34 mm) in size and obtain in this way a sieved fresh briquette.
  • the edges and residues of fresh briquettes with sizes smaller than 1/4 of an inch pass to a crumbling system (11) to then be reincorporated to the feed hopper of the roller press and to be briquetted together with the final mixture in step f) .
  • the sieved fresh briquettes are cured in closed warehouses (12) at ambient conditions for at least 24 hours to improve the resistance properties, during which time the briquettes acquire resistance so that they do not degrade during their handling and thus obtain cured briquettes.
  • a porosity 18 to 28% by volume and preferably from 21 to 25% by volume to improve its reduction properties within the reactors of the Direct Reduction iron production processes.
  • the improvement in the properties of both strength and porosity influence the metallurgical behavior of the briquette, so that industrial tests carried out in HyL Direct Reduction reactors have given metallization results greater than 92.5%, understanding the percentage of metallic Fe with respect to metallization. the percentage of total Fe obtained by processing these briquettes in the Direct Reduction reactors.
  • the fresh briquettes are cured in an accelerated manner in straight grill type drying ovens that operate at temperatures higher than ambient, preferably from 80 to 100 ° C with a residence time preferably longer than 2 hours, during which time briquettes are obtained cured and with adequate resistance for subsequent handling.
  • the cured briquette is sent to both HyL and Midrex Direct Reduction iron production processes for consumption.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
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  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The present invention relates to a method for producing briquettes from pellet fines, direct-reduced iron (DRI) sludge, DRI fines and dust from DRI dedusting systems, which comprises processing said materials; briquetting with roller presses, using liquid sodium silicate and bentonite or composite Portland cement as binders; sieving the briquettes; shredding the edges and waste of the fresh briquettes; and curing in order to improve the physical properties thereof, such as strength. Once cured, the fresh briquette can be stored or sent directly to DRI production processes, both HyL and Midrex, for use as part of the feedstock for reduction ovens or reactors.

Description

PROCESO PARA LA OBTENCION DE BRIQUETAS A PARTIR DE FINOS DE PELLET, LODOS DE DRI, FINOS DE DRI Y POLVOS DE SISTEMAS DE DESEMPOLVADO DE DRI PARA SU USO INDUSTRIAL EN PROCESOS DE PRODUCCION DE HIERRO DE REDUCCIÓN DIRECTA PROCESS FOR THE OBTAINING OF BRIQUETTES FROM PELLET FINE, DRI SLUDGE, DRI FINE AND POWDERS FROM DRI DUSTING SYSTEMS FOR INDUSTRIAL USE IN DIRECT REDUCTION IRON PRODUCTION PROCESSES
DESCRIPCIÓN DESCRIPTION
OBJETO DE LA INVENCIÓN Establecer un proceso mediante el cual se obtienen briquetas para su uso industrial a partir de finos de pellet, lodos de DRI, finos de DRI y polvos de sistemas de desempolvado de DRI para de esta forma reincorporarlos a los procesos producción de hierro de Reducción Directa, contribuyendo a la reutilización de los sub productos generados por estos procesos, además de minimizar los inventarios de este tipo de materiales con su consecuente contribución a mejorar el medio ambiente. OBJECT OF THE INVENTION To establish a process by which briquettes for industrial use are obtained from pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems in order to reincorporate them to the iron production processes of Direct Reduction, contributing to the reuse of by-products generated by these processes, in addition to minimizing inventories of this type of material with its consequent contribution to improving the environment.
ANTECEDENTES BACKGROUND
El proceso de briqueteado consiste en aglomerar por compresión los materiales mediante el uso de prensas de rodillos en las que dependiendo de las características de los materiales será necesario el uso de aglomerantes que ayuden a conformar una briqueta que cumpla con las características de resistencia adecuadas para su manejo en los procesos posteriores. The briquetting process consists of compression agglomeration of the materials through the use of roller presses in which depending on the characteristics of the materials it will be necessary to use binders that help to form a briquette that meets the appropriate resistance characteristics for its handling in subsequent processes.
Las dimensiones y forma de la briqueta también dependen del uso final que se les dará. The dimensions and shape of the briquette also depend on the end use that will be given.
Existen procesos de elaboración de briquetas de materiales diversos subproductos de las industrias siderúrgicas que a diferencia de las actuales se usan tal cual se generan para incrementar producciones (briquetas de finos de hierro esponja) o generar energía (briquetas de finos de carbón) en los procesos de la industria siderúrgica. Existen también procesos de elaboración de briquetas de finos de pellet y de finos de mineral de hierro para uso en reactores horizontales de reducción. There are processes for the production of briquettes of various by-products from the iron and steel industries that, unlike the current ones, are used as they are generated to increase production (sponge iron fines briquettes) or generate energy (coal fines briquettes) in the steel industry processes. There are also processes for making pellet fines briquettes and iron ore fines for use in horizontal reduction reactors.
La patente con número de registro EP 1425427 A4 en la cual se describe un método para producir briquetas cocidas para usarse como carga en los Altos Hornos o en Hornos de Reducción Directa a partir de la mezcla de mineral de hierro hidratado y fundentes siendo el mineral de hierro preferentemente Goethita y los fundentes preferentemente caliza lo cual hace la diferencia con respecto a la presente invención en donde se utilizan finos de pellet, lodos de DRI, finos de DRI y polvos de sistemas de desempolvado de DRI y no se adiciona caliza. El cocimiento de las briquetas de la patente referida es para endurecerlas y facilitar su manejo usando para esto hornos de cocimiento con temperaturas de al menos 1200 °C y más preferentemente de al menos 1380 °C por al menos 15 minutos lo cual hace la diferencia con respecto a la presente invención en donde el endurecimiento de la briqueta se logra con un curado a temperatura ambiental. Patent with registration number EP 1425427 A4, which describes a method to produce cooked briquettes to be used as a charge in Blast Furnaces or Direct Reduction Furnaces from the mixture of hydrated iron ore and fluxes, being the mineral of iron preferably Goethite and fluxes preferably limestone which makes the difference from the present invention where pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems are used and no limestone is added. The firing of the briquettes of the referred patent is to harden them and facilitate their use by using firing furnaces with temperatures of at least 1200 ° C and more preferably at least 1380 ° C for at least 15 minutes, which makes the difference with With respect to the present invention, where the briquette hardening is achieved with a cure at room temperature.
La patente US 2865731 A en la cual se describe un método para producir briquetas cilindricas con un pistón hidráulico a partir de mineral de hierro y pulpa de papel como aglomerante siendo el mineral de hierro concentrados de flotación de hematita lo cual hace la diferencia con respecto a la presente invención en donde se utilizan finos de pellet, lodos de DRI, finos de DRI y polvos de sistemas de desempolvado de DRI usando aglomerantes inorgánicos para formar la briqueta en prensa de rodillo. La patente US 3125437 A en la cual se describe un método para briqueteado de mineral de hierro usando finos de hematita parcialmente reducidos mediante un agente reductor con temperaturas por debajo de 1500°F para luego briquetearlos en caliente a temperaturas entre 700 y 1300°F lo cual hace la diferencia con respecto a la presente invención en donde se utilizan finos de pellet, lodos de DRI, finos de DRI y polvos de sistemas de desempolvado de DRI usando aglomerantes orgánicos para formar la briqueta en prensa de rodillos a temperatura ambiente. Patent US 2865731 A in which a method is described for producing cylindrical briquettes with a hydraulic piston from iron ore and paper pulp as a binder, the iron ore being hematite flotation concentrates which makes the difference with respect to The present invention wherein pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems are used using inorganic binders to form the roll press briquette. US patent 3125437 A in which a method for briquetting iron ore is described using hematite fines partially reduced by a reducing agent with temperatures below 1500 ° F, and then hot briquetting them at temperatures between 700 and 1300 ° F Which makes the difference from the present invention where pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems are used using organic binders to form the briquette in a roller press at room temperature.
La patente US 2012/0210824 Al en la cual se hace describe un método para producir aglomerados de curado en frío en forma de pellets o de micropellets en un disco o tambor de peletizado a partir de minerales de hierro con tamaño de partícula fino preferentemente 80% por debajo de la malla 325 o también usando subproductos de la industria siderúrgica como los polvos de EAF y de BOF, finos de sinter feed o de sinter, o finos de concentrado de mineral de hierro usando para ello como aglutinante cemento portland o clinker o aglutinantes orgánicos como acrilamidas o carboximetilcelulosas y teniendo como uso final para los micropellets las plantas sinterizadoras y para los pellets los Altos Hornos, lo cual hace la diferencia con respecto a la presente invención en donde se fabrican briquetas a partir de finos de pellet, lodos de DRI, finos de DRI y polvos de sistemas de desempolvado de DRI en prensas de rodillos usando como aglutinante bentonita y silicato de sodio líquido y teniendo como uso final para la briqueta las plantas de reducción directa. US patent 2012/0210824 Al in which it is described describes a method for producing cold-cured agglomerates in the form of pellets or micro-pellets in a pelletizing disk or drum from iron minerals with fine particle size preferably 80% below 325 mesh or also using by-products from the steel industry such as EAF and BOF powders, sinter feed or sinter fines, or iron ore concentrate fines using portland cement or clinker or binders as binder organic as acrylamides or carboxymethylcelluloses and having as final use for micro-pellets sintering plants and for pellets the Blast Furnaces, which makes the difference with respect to the present invention where briquettes are manufactured from pellet fines, DRI sludge , DRI fines and DRI dedusting system powders on roller presses using bentonite and liquid sodium silicate as binder and having as use end for briquette direct reduction plants.
La patente US 2005/0050996 Al en la cual se hace describe un método para producir briquetas auto fundentes en una prensa de rodillos de baja presión a partir de minerales de hierro específicamente hematita, magnetita, goethita o mezcla de ellos triturados todos a tamaños menores a 4 mm y mezclados también con un fundente preferiblemente caliza con un tamaño menor a 100 mieras, las briquetas obtenidas así son llamadas briquetas verdes y son luego endurecidas en un horno de cocimiento por tiempos que oscilan entre 15-40 minutos a temperaturas que oscilan entre 1200-1380 °C, el uso final de estas briquetas endurecidas son los Altos Hornos o las plantas de reducción directa, , lo cual hace la diferencia con respecto a la presente invención en donde se fabrican briquetas a partir de finos de pellet, lodos de DRI, finos de DRI y polvos de sistemas de desempolvado de DRI en prensas de rodillos usando como aglutinante bentonita y silicato de sodio líquido, el curado se realiza en almacenes cerrados a temperatura ambiente y opcionalmente en hornos de secado que operan a 80-100 °C y teniendo como uso final estas briquetas las plantas de reducción directa US patent 2005/0050996 Al in which it is done describes a method for producing self-melting briquettes in a low pressure roller press from minerals iron specifically hematite, magnetite, goethite or a mixture of them all crushed to sizes less than 4 mm and also mixed with a flux, preferably limestone with a size less than 100 microns, the briquettes obtained in this way are called green briquettes and are then hardened in a firing furnace for times ranging from 15-40 minutes at temperatures ranging from 1200-1380 ° C, the end use of these hardened briquettes are the Blast Furnaces or direct reduction plants, which makes the difference with respect to The present invention where briquettes are manufactured from pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems in roller presses using as a binder bentonite and liquid sodium silicate, curing is carried out in warehouses closed at room temperature and optionally in drying ovens that operate at 80-100 ° C and having as direct use these briquettes direct reduction plants
BREVE DESCRIPCIÓN DE LAS FIGURAS BRIEF DESCRIPTION OF THE FIGURES
La figura 1 hace referencia al diagrama de flujo del proceso de obtención briquetas a partir de finos de pellet, lodos de DRI, finos de DRI y polvos de sistemas de desempolvado de DRI. Figure 1 refers to the flow diagram of the process for obtaining briquettes from pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems.
DESCRIPCIÓN DETALLADA DE LA INVENCIÓN DETAILED DESCRIPTION OF THE INVENTION
La presente invención se refiere a un proceso de fabricación de briquetas a partir de los siguientes materiales subproductos de la industria siderúrgica; The present invention relates to a process for manufacturing briquettes from the following by-products from the steel industry;
• Finos de pellet; Obtenidos del cribado de los pelets de óxido de hierro que se usan como carga a los Altos Hornos o a los reactores de Reducción Directa. • Lodos de DRI; Obtenidos de los sistemas de captación de polvos mediante lavado de gases de la zona de alimentación y de la zona de reacción en los reactores de Reducción Directa. • Pellet fines; Obtained from the screening of the iron oxide pellets that are used as cargo to the Blast Furnaces or Direct Reduction reactors. • DRI sludge; Obtained from the dust collection systems by gas scrubbing of the feed zone and the reaction zone in Direct Reduction reactors.
• Finos de DRI; Obtenidos del cribado de Hierro de Reducción Directa (DRI por sus siglas en inglés). • DRI fines; Obtained from the screening of Direct Reduction Iron (DRI).
• Polvos del sistema de desempolvado de DRI; Obtenidos en los sistemas de control de emisiones de polvos de los equipos que manejan o acarrean el Hierro de Reducción Directa o DRI. • Dusts from the DRI dedusting system; Obtained in the dust emission control systems of the equipment that handles or carries the Direct Reduction Iron or DRI.
El uso final de las briquetas es sustituir parcialmente la carga de pelets de óxidos de hierro en los reactores de Reducción Directa tanto HyL como Midrex por sus características físicas, químicas y metalúrgicas para la producción final de hierro de Reducción Directa (DRI) y que comprende las siguientes etapas; a) Cribado y trituración de los finos de pellet The end use of the briquettes is to partially replace the iron oxide pellet charge in both HyL and Midrex Direct Reduction reactors with their physical, chemical and metallurgical characteristics for the final production of Direct Reduction iron (DRI) and comprising the following stages; a) Screening and crushing of pellet fines
Los Finos de pellet son cribados por una malla con tamaño de abertura de 1/8 de pulgada (3.17 mm) para obtener partículas de finos de pellet primarias menores a un tamaño de 1/8 de pulgada (3.17mm), las cuales son colocadas en una banda transportadora, y las partículas de finos de pellet mayores a un tamaño de 1/8 de pulgada (3.17 mm) pasan a ser trituradas mediante el uso de una trituradora preferentemente de mandíbula (1) para obtener partículas de finos de pellet secundarias con tamaños menores a 1/8 de pulgada (3.17 mm) las cuales posteriormente son colocadas junto con las partículas de finos de pellet primarias menores a 1/8 de pulgada (3.17 mm) en la banda transportadora y obtener partículas de finos de pellet finales con tamaños menores a 1/8 de pulgada (3.17 mm) b) Cribado y trituración de lodos de DRI Pellet fines are screened by a 1/8 inch (3.17 mm) opening size mesh to obtain particles of primary pellet fines smaller than 1/8 inch (3.17mm) size, which are placed on a conveyor belt, and pellet fines particles larger than 1/8 inch (3.17 mm) in size are crushed by using a preferably jaw crusher (1) to obtain secondary pellet fines particles with sizes smaller than 1/8 inch (3.17 mm) which are subsequently placed together with the primary pellet fines particles smaller than 1/8 inch (3.17 mm) in the conveyor belt and obtain final pellet fines particles with sizes less than 1/8 inch (3.17 mm) b) DRI sludge screening and crushing
Los lodos de DRI los cuales con una humedad menor a 10% y preferentemente menor a 5% son cribados por una malla con tamaño de abertura de 1/8 de pulgada (3.17 mm) para obtener partículas de lodos de DRI primarias menores a un tamaño de 1/8 de pulgada (3.17mm), las cuales son colocadas en una banda transportadora, y las partículas de lodos de DRI mayores a un tamaño de 1/8 de pulgada (3.17 mm) pasan a ser trituradas mediante el uso de una trituradora preferentemente de mandíbula (2) para obtener partículas de lodos de DRI secundarias con tamaños menores a 1/8 de pulgada (3.17 mm) las cuales posteriormente son colocadas junto con las partículas de lodos de DRI primarias menores a 1/8 de pulgada (3.17 mm) en la banda transportadora y obtener partículas de lodos DRI finales con tamaños menores a 1/8 de pulgada (3.17 mm) c) Cribado de finos de DRI DRI sludge which with humidity less than 10% and preferably less than 5% is screened by a mesh with opening size of 1/8 inch (3.17 mm) to obtain primary DRI sludge particles smaller than one size 1/8 inch (3.17mm), which are placed on a conveyor belt, and DRI sludge particles larger than 1/8 inch (3.17 mm) size are shredded using a preferably jaw crusher (2) to obtain secondary DRI sludge particles smaller than 1/8 inch (3.17 mm) which are subsequently placed together with the primary DRI sludge particles smaller than 1/8 inch ( 3.17 mm) on the conveyor belt and obtain final DRI sludge particles smaller than 1/8 inch (3.17 mm) in size c) DRI fine screening
Los finos de DRI son un material que ya ha pasado por un proceso de cribado en la planta que los genera y para garantizar uniformidad en el tamaño son nuevamente cribados por una malla (3) con tamaño de abertura de 1/4 de pulgada (6.34 mm) para obtener partículas de finos de DRI finales menores a un tamaño de 1/4 de pulgada (6.34 mm), las cuales son colocadas en una banda transportadora para su uso en el proceso de briqueteado, y las partículas de finos de DRI mayores a un tamaño de 1/4 de pulgada (6.34 mm) son apartadas para su uso tal cual como carga a en los hornos de Acería Eléctrica. d) Almacenamiento de polvos de sistemas de desempolvado de DRIThe DRI fines are a material that has already gone through a screening process in the plant that generates them and, to guarantee uniformity in size, they are again screened by a mesh (3) with an opening size of 1/4 inch (6.34). mm) to obtain final DRI fines particles smaller than 1/4 inch (6.34 mm) in size, which are placed on a conveyor belt for use in the briquetting process, and larger DRI fines particles At a size of 1/4 inch (6.34 mm) they are set aside for use as-is as load a in Electric Steel Mill furnaces. d) Dust storage from DRI dedusting systems
Los polvos de sistemas de desempolvado de DRI son almacenados en tolvas o silos (4) para que mediante un sistema dosificador sean luego usados en el proceso de briqueteado e) Mezclado de las partículas luíales de finos de pellet, lodos de DRI , finos de DRI y polvos de sistemas de desempolvado de DRI con los aglomerantes Powders from DRI dedusting systems are stored in hoppers or silos (4) so that they can be used in the briquetting process by means of a dosing system. E) Mixing of luial particles of pellet fines, DRI sludge, DRI fines. and powders from DRI dedusting systems with binders
Las partículas finales de finos de pellet con tamaños menores a 1/8 de pulgada, de lodos de DRI con tamaños menores a 1/8 de pulgada, de finos de DRI con tamaños menores a 1/4 de pulgada y de polvos de sistemas de desempolvado de DRI se mezclan con los aglomerantes líquido y en polvo, preferentemente del 1 al 12% para el silicato de sodio liquido (5) y preferentemente del 1 al 10% para la bentonita en polvo (6), y con el agua (7) necesaria para obtener una humedad adecuada en un mezclador, preferentemente en un mezclador horizontal de doble eje (8), para obtener una mezcla final a usarse en la etapa de briqueteado. La combinación de estos aglomerantes líquido y en polvo proporciona a la briqueta producida las características de porosidad y resistencia física necesarias para un desempeño favorable en los reactores de Reducción Directa tanto HyL como Midrex. Final particles of pellet fines smaller than 1/8 inch, from DRI sludge smaller than 1/8 inch, from DRI fines smaller than 1/4 inch and dust from DRI dusts are mixed with liquid and powder binders, preferably 1 to 12% for liquid sodium silicate (5) and preferably 1 to 10% for bentonite powder (6), and with water (7 ) necessary to obtain adequate humidity in a mixer, preferably in a horizontal double-shaft mixer (8), to obtain a final mixture to be used in the briquetting stage. The combination of these liquid and powder binders provides the produced briquette with the porosity and physical strength characteristics necessary for favorable performance in both HyL and Midrex Direct Reduction reactors.
Opcionalmente solo se mezclan las partículas finales de finos de pellet con tamaño menor a 1/8 de pulgada y de lodos de DRI con tamaño menor a 1/8 de pulgada en proporciones desde 10% finos de pelet-90% lodos de DRI hasta 90% finos de pelet- 10% lodos de DRI con los aglomerantes líquido y en polvo para obtener una mezcla final a usarse en la etapa de briqueteado Optionally, only the final particles of pellet fines smaller than 1/8 inch and DRI sludge smaller than 1/8 inch are mixed in proportions from 10% pellet fines-90% DRI sludge up to 90 % fine pellets- 10% DRI sludge with liquid and powder binders to obtain a final mix to be used in the briquetting stage
Opcionalmente se usa cemento portland compuesto como aglomerante preferentemente del 1 al 10% en lugar de bentonita en polvo. í) Briqueteado de la mezcla final de partículas de finos de pellet, de lodos de DRI , de finos de DRI, de polvos de sistemas de desempolvado de DRI y aglomerantes líquido y en polvo Optionally, composite Portland cement is used as a binder, preferably from 1 to 10% instead of powdered bentonite. í) Briquetting of the final mixture of pellet fines particles, DRI sludge, DRI fines, DRI dust removal system powders and liquid and powder binders
La mezcla final obtenida se pasa a una tolva alimentadora de una prensa de rodillos (9) para ser briqueteada con una fuerza específica de compresión mediante un sistema de pistones hidráulicos preferentemente de 0-147 kN/cm lineal de rodillo (que equivalen a 0-15 tonf/cm lineal de rodillo) y obtener de esta forma briquetas frescas tipo esferoidal preferentemente con un diámetro en parte más ancha menor a 3.2 cm y con un volumen preferentemente menor a 7.5 cm3. g) Cribado de las briquetas frescas The final mixture obtained is passed to a feeding hopper of a roller press (9) to be briquetted with a specific compression force by means of a system of hydraulic pistons, preferably 0-147 kN / linear cm of roller (equivalent to 0- 15 ton / linear roller cm) and thus obtain fresh spheroidal briquettes, preferably with a diameter that is somewhat wider than 3.2 cm and with a volume preferably less than 7.5 cm3. g) Screening of fresh briquettes
Las briquetas frescas tipo esferoidal pasan por una criba vibradora inclinada (10) de una sola cama y con abertura de 1/4 de pulgada para retirar bordes y residuos de briquetas frescas con tamaños menores a 1/4 de pulgada (6.34 mm) y obtener de esta forma una briqueta fresca cribada. Los bordes y residuos de briquetas frescas con tamaños menores a 1/4 de pulgada pasan a un sistema desmenuzador (11) para luego ser reincorporados a la tolva alimentadora de la prensa de rodillo y ser briqueteados junto con la mezcla final en la etapa f). h) Curado de las briquetas frescas cribadas. Fresh spheroidal briquettes pass a 1-inch, single bed, inclined vibrating screen (10) to remove edges and residue from fresh briquettes smaller than 1/4 inch (6.34 mm) in size and obtain in this way a sieved fresh briquette. The edges and residues of fresh briquettes with sizes smaller than 1/4 of an inch pass to a crumbling system (11) to then be reincorporated to the feed hopper of the roller press and to be briquetted together with the final mixture in step f) . h) Curing of the sieved fresh briquettes.
Las briquetas frescas cribadas son curadas en almacenes cerrados (12) a condiciones ambientales por al menos 24 horas para mejoran las propiedades de resistencia, tiempo durante el cual las briqueta adquieren resistencia para que no se degraden durante su manejo y obtener de esta forma briquetas curadas con una porosidad de 18 a 28% en volumen y preferentemente de 21 a 25 % en volumen para mejorar sus propiedades de reducción dentro de los reactores de los procesos de producción de hierro de Reducción Directa. La mejora en las propiedades tanto de resistencia como porosidad influyen en el comportamiento metalúrgico de la briqueta de manera que pruebas industriales realizadas en reactores de Reducción Directa HyL han dado resultados de metalización mayores a 92.5%, entendiendo por metalización el porcentaje de Fe metálico con respecto al porcentaje de Fe total que se obtiene al procesar estas briquetas en los reactores de Reducción Directa. The sieved fresh briquettes are cured in closed warehouses (12) at ambient conditions for at least 24 hours to improve the resistance properties, during which time the briquettes acquire resistance so that they do not degrade during their handling and thus obtain cured briquettes. with a porosity of 18 to 28% by volume and preferably from 21 to 25% by volume to improve its reduction properties within the reactors of the Direct Reduction iron production processes. The improvement in the properties of both strength and porosity influence the metallurgical behavior of the briquette, so that industrial tests carried out in HyL Direct Reduction reactors have given metallization results greater than 92.5%, understanding the percentage of metallic Fe with respect to metallization. the percentage of total Fe obtained by processing these briquettes in the Direct Reduction reactors.
Opcionalmente las briquetas frescas son curadas en forma acelerada en hornos de secado tipo parrilla recta que operan a temperaturas mayores que la ambiental, preferentemente de 80 a 100 °C con un tiempo de permanencia preferentemente mayor a 2 horas, tiempo durante el cual se obtienen briquetas curadas y con resistencia adecuada para su manejo posterior. Optionally, the fresh briquettes are cured in an accelerated manner in straight grill type drying ovens that operate at temperatures higher than ambient, preferably from 80 to 100 ° C with a residence time preferably longer than 2 hours, during which time briquettes are obtained cured and with adequate resistance for subsequent handling.
La briqueta curada es enviada a los procesos de producción de hierro de Reducción Directa tanto HyL como Midrex para su consumo. The cured briquette is sent to both HyL and Midrex Direct Reduction iron production processes for consumption.

Claims

PROCESO PARA LA OBTENCION DE BRIQUETAS A PARTIR DE FINOS DE PELLET, LODOS DE DRI, FINOS DE DRI Y POLVOS DE SISTEMAS DE DESEMPOLVADO DE DRI PARA SU USO INDUSTRIAL EN PROCESOS DE PRODUCCION DE HIERRO DE REDUCCIÓN DIRECTA REIVINDICACIONES Habiendo descrito suficiente mi invención, la considero como una novedad y por lo tanto reclamo como de mi exclusiva propiedad, lo contenido en las siguientes cláusulas: A PARTIR DE FINOS DE PELLET, LODOS DE DRI, FINOS DE DRI Y POLVOS DE SISTEMAS DE DESEMPOLVADO DE DRI PROCESS FOR THE OBTAINING OF BRIQUETTES FROM PELLET FINE, DRI SLUDGE, DRI FINE AND POWDERS FROM DRI DUSTING SYSTEMS FOR INDUSTRIAL USE IN DIRECT REDUCTION IRON PRODUCTION PROCESSES. I have considered my invention sufficiently as a novelty and therefore I claim as my exclusive property, the content in the following clauses: FROM PELLET FINE, DRI SLUDGE, DRI FINE AND POWDER OF DRI DUSTING SYSTEMS
1. Un proceso para la obtención de briquetas a partir de finos de pellet, lodos de DRI, finos de DRI y polvos de sistemas de desempolvado de DRI caracterizado por que se comprende de las siguientes etapas: a) Cribado y trituración de los finos de pellet, b) Cribado y trituración de lodos de DRI c) Cribado de finos de DRI d) Almacenamiento de polvos de sistemas de desempolvado de DRI e) Mezclado de las partículas finales de finos de pellet, lodos de DRI , finos de DRI y polvos de sistemas de desempolvado de DRI con los aglomerantes í) Briqueteado de la mezcla final de partículas de finos de pellet, de lodos de DRI , de finos de DRI, de polvos de sistemas de desempolvado de DRI y aglomerantes líquido y en polvo g) Cribado de las briquetas frescas y, h) Curado de las briquetas frescas cribadas 1. A process for obtaining briquettes from pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems characterized in that it comprises the following stages: a) Screening and crushing the pellet, b) DRI sludge screening and crushing c) DRI fines screening d) Storage of powders from DRI dedusting systems e) Mixing of final particles of pellet fines, DRI sludge, DRI fines and powders of DRI dedusting systems with binders i) Briquetting of the final mixture of pellet fines particles, DRI sludge, DRI fines, powders of DRI dedusting systems and liquid and powder binders g) Screening of the fresh briquettes and, h) Curing of the sieved fresh briquettes
2. Un proceso caracterizado porque la obtención de briquetas se realiza a partir de finos de pellet, lodos de DRI, finos de DRI y polvos de sistemas de desempolvado de DRI de conformidad con la reivindicación 1. 2. A process characterized in that the briquettes are obtained from pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems in accordance with claim 1.
3. El proceso para la obtención de briquetas a partir de finos de pellet, lodos de DRI, finos de DRI y polvos de sistemas de desempolvado de DRI de conformidad con la reivindicación 1, caracterizado porque en la etapa e) las partículas de finos de pellet finales con tamaños menores a 1/8 de pulgada, las partículas de lodos de DRI finales con tamaños menores a 1/8 de pulgada, las partículas de finos de DRI finales con tamaño menor a 1/4 de pulgada y los polvos de sistemas de desempolvado de DRI se mezclan con los aglomerantes líquido y en polvo, y con el agua necesaria para alcanzar una humedad adecuada en un mezclador y de esa manera de obtener una mezcla final a usarse en la etapa de briqueteado. 3. The process for obtaining briquettes from pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems according to claim 1, characterized in that in step e) the fines particles of final pellet sizes less than 1/8 inch, final DRI sludge particles smaller than 1/8 inch, final DRI fines particles smaller than 1/4 inch and system powders of DRI dusting are mixed with the liquid and powder binders, and with the water necessary to achieve adequate humidity in a mixer and thus obtain a final mixture to be used in the briquetting stage.
4. El proceso para la obtención de briquetas a partir de finos de pellet, lodos de DRI, finos de DRI y polvos de sistemas de desempolvado de DRI de conformidad con la reivindicación 1, caracterizado porque en la etapa e) opcionalmente solo se mezclan las partículas de finos de pellet finales con tamaño menor a 1/8 de pulgada y las partículas de lodos de DRI finales con tamaño menor a 1/8 de pulgada en proporciones desde 10% finos de pelet-90% lodos de DRI hasta 90% finos de pelet-10% lodos de DRI con los aglomerantes líquido y en polvo para obtener una mezcla final a usarse en la etapa de briqueteado 4. The process for obtaining briquettes from pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems according to claim 1, characterized in that in step e) optionally only the final pellet fines particles smaller than 1/8 inch and final DRI sludge particles smaller than 1/8 inch in proportions from 10% pellet fines-90% DRI muds to 90% fine pellet-10% DRI sludge with liquid and powder binders to obtain a final mix to be used in the briquetting stage
5. Los aglomerantes líquido y en polvo de conformidad con la reivindicación 3, caracterizado porque son preferentemente del 1 al 12% para el silicato de sodio líquido y preferentemente del 1 al 10% para la bentonita en polvo. 5. The liquid and powder binders according to claim 3, characterized in that they are preferably from 1 to 12% for the liquid sodium silicate and preferably from 1 to 10% for the bentonite powder.
6. El aglomerante en polvo de conformidad con la reivindicación 5, caracterizado porque opcionalmente se usa cemento portland compuesto como aglomerante en polvo preferentemente del 1 al 10% en lugar de bentonita en polvo 6. The powder binder according to claim 5, characterized in that optionally composite portland cement is used as a powder binder preferably from 1 to 10% instead of bentonite powder
7. El mezclador de conformidad con la reivindicación 3, caracterizado porque es preferentemente en un mezclador horizontal de doble eje. 7. The mixer according to claim 3, characterized in that it is preferably in a double axis horizontal mixer.
8. El proceso para la obtención de briquetas a partir de finos de pellet, lodos de DRI, finos de DRI y polvos de sistemas de desempolvado de DRI de conformidad con la reivindicación 1, caracterizado porque en la etapa f) la mezcla final obtenida se pasa a una tolva alimentadora de una prensa de rodillos para ser briqueteada con una fuerza específica de compresión preferentemente entre 0 y 147 kN/cm lineal de rodillo (que equivalen a 0-15 tonf/cm lineal de rodillo) y obtener briquetas frescas tipo esferoidal preferentemente con un diámetro en parte más ancha menor a 3.2 cm y con un volumen preferentemente menor a 7.5 cm3. 8. The process for obtaining briquettes from pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems according to claim 1, characterized in that in step f) the final mixture obtained is it passes to a hopper that feeds a roller press to be briquetted with a specific compression force, preferably between 0 and 147 kN / cm linear roller (equivalent to 0-15 tonf / cm linear roller) and obtain fresh spheroidal briquettes preferably with a partly wider diameter less than 3.2 cm and with a volume preferably less than 7.5 cm3.
9. El proceso para la obtención de briquetas a partir de finos de pellet, lodos de DRI, finos de DRI y polvos de sistemas de desempolvado de DRI de conformidad con la reivindicación 1, caracterizado porque en la etapa g) Las briquetas frescas tipo esferoidal pasan por una criba vibradora inclinada de una sola cama y con abertura de 1/4 de pulgada para retirar bordes y residuos de briquetas frescas con tamaños menores a 1/4 de pulgada (6.34 mm) y obtener de esta forma una briqueta fresca cribada; dichos bordes y residuos de briquetas frescas con tamaños menores a 1/4 de pulgada pasan a un equipo desmenuzador para luego ser enviados a la tolva alimentadora de la prensa de rodillo y ser reincorporados a la etapa f). 9. The process for obtaining briquettes from pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems according to claim 1, characterized in that in step g) Fresh spheroidal briquettes they go through a single bed slant vibrating screen with a 1/4 inch opening to remove edges and residues of fresh briquettes smaller than 1/4 inch (6.34 mm) in order to obtain a fresh screened briquette; Said edges and residues of fresh briquettes with sizes smaller than 1/4 of an inch pass to a crumbling equipment to then be sent to the feed hopper of the roller press and to be reincorporated to step f).
10. El proceso para la obtención de briquetas a partir de finos de pellet, lodos de DRI, finos de DRI y polvos de sistemas de desempolvado de DRI de conformidad con la reivindicación 1, caracterizado porque en la etapa h) las briquetas frescas cribadas son curadas en almacenes cerrados a condiciones ambientales por al menos 24 horas para mejoran las propiedades de resistencia, tiempo durante el cual las briquetas adquieren resistencia para que no se degrade durante su manejo y obtener de esta forma briquetas curadas con una porosidad de 18 a 28% en volumen y preferentemente de 21 a 25 % en volumen para mejorar sus propiedades de reducción dentro de los reactores de los procesos de producción de hierro de reducción directa. 10. The process for obtaining briquettes from pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems in accordance with Claim 1, characterized in that in step h) the sieved fresh briquettes are cured in closed warehouses at ambient conditions for at least 24 hours to improve the resistance properties, during which time the briquettes acquire resistance so that they do not degrade during their handling and obtaining in this way cured briquettes with a porosity of 18 to 28% by volume and preferably from 21 to 25% by volume to improve their reduction properties within the reactors of the direct reduction iron production processes.
11. El proceso para la obtención de briquetas a partir de finos de pellet, lodos de DRI, finos de DRI y polvos de sistemas de desempolvado de DRI de conformidad con la reivindicación 1, caracterizado porque opcionalmente en la etapa h) las briquetas frescas cribadas son curadas en forma acelerada en hornos de secado tipo parrilla recta que operan a temperaturas mayores que la ambiental, preferentemente de 80 a 100 °C con un tiempo de permanencia preferentemente mayor a 2 horas para mejorar las propiedades de resistencia, tiempo durante el cual se obtienen briquetas curadas y con resistencia adecuada para su manejo posterior. 11. The process for obtaining briquettes from pellet fines, DRI sludge, DRI fines and powders from DRI dedusting systems according to claim 1, characterized in that optionally in step h) the sieved fresh briquettes they are cured in an accelerated manner in straight grill drying ovens that operate at temperatures higher than ambient, preferably from 80 to 100 ° C with a residence time preferably longer than 2 hours to improve the resistance properties, during which time They obtain briquettes cured and with adequate resistance for subsequent handling.
PCT/MX2018/050029 2018-12-12 2018-12-12 Method for producing briquettes from pellet fines, dri sludge, dri fines and dust from dri dedusting systems, for industrial use in direct-reduced iron production processes WO2020122701A1 (en)

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CN201880100650.XA CN113366128A (en) 2018-12-12 2018-12-12 A method of briquetting coal from pellet fines, DRI sludge, DRI fines and residual fines from DRI dust treatment system

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