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EP1646731B1 - Method for the production of ore with green agglomerates containing a proportion of fines - Google Patents

Method for the production of ore with green agglomerates containing a proportion of fines Download PDF

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Publication number
EP1646731B1
EP1646731B1 EP04737378A EP04737378A EP1646731B1 EP 1646731 B1 EP1646731 B1 EP 1646731B1 EP 04737378 A EP04737378 A EP 04737378A EP 04737378 A EP04737378 A EP 04737378A EP 1646731 B1 EP1646731 B1 EP 1646731B1
Authority
EP
European Patent Office
Prior art keywords
agglomeration drum
combustible
drum
green agglomerates
mixer
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
EP04737378A
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German (de)
French (fr)
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EP1646731A1 (en
Inventor
Oskar Pammer
Hans Stiasny
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.)
Primetals Technologies Austria GmbH
Original Assignee
Siemens VAI Metals Technologies GmbH and Co
Siemens VAI Metals Technologies GmbH Austria
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Application filed by Siemens VAI Metals Technologies GmbH and Co, Siemens VAI Metals Technologies GmbH Austria filed Critical Siemens VAI Metals Technologies GmbH and Co
Priority to PL04737378T priority Critical patent/PL1646731T3/en
Publication of EP1646731A1 publication Critical patent/EP1646731A1/en
Application granted granted Critical
Publication of EP1646731B1 publication Critical patent/EP1646731B1/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
    • 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
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic
    • C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
    • 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
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing

Definitions

  • the invention relates to a process for the production of ore with a fines, aggregates and optionally a binder-containing green agglomerates, which are provided with a fine-grained carbon-containing fuel, such as coke, and optionally a binder, formed casing, wherein the ore with the Aggregates and the optionally present binder is mixed, the mixture is pelletized and the green agglomerates thus formed are coated with the addition of the fuel in an agglomeration drum with the fuel, and a plant for carrying out the method.
  • a fine-grained carbon-containing fuel such as coke
  • a binder formed casing
  • a method of this kind is known from EP A2 0 271 863 known.
  • the ore which has a fines content, is pelletized, the aggregates and the binder are pelletised.
  • the green agglomerates thus formed are then transferred to a roller burnishing drum in which they are coated with fine coke.
  • pelletizing plates have only a limited capacity, i. it is for a larger and more efficient system to provide a plurality of pelletizing plates, whereas it is sufficient to provide with a single agglomerating drum for wrapping the green agglomerates formed in the pelletizing plates.
  • the coupling of the plurality of pelletizing plates with a single agglomerating drum is expensive, especially since a conveyor must lead from each of the pelletizing plates to the agglomerating drum. In this promotion, it may lead to the destruction of part of the green agglomerates formed.
  • the invention aims to avoid these disadvantages and difficulties and has as its object to provide a method and a system for carrying out the method, which ensure a uniform and continuous process of producing the green agglomerates.
  • the process should require only a little complex system for large throughputs per unit time. It's a special one Object of the invention, a change to different modes of operation - caused by different Feinerzzusammen GmbHen or different additives, etc., - To allow in a particularly simple manner.
  • This object is achieved in a method of the type described above in that the mixture is pelletized in the Agglomeriertrommel and the fuel is added at a region of the longitudinal extent of Agglomeriertrommel at which forming in the Agglomeriertrommel green agglomerates for further processing have desired size.
  • a particularly simple adaptation of the method according to the invention to different modes of operation, different ores, different ore compositions, etc., is characterized in that the addition area of the fuel into the agglomerating drum is varied over the length of the agglomerating drum depending on the nature and size of the green agglomerates.
  • a plant for the production of ore with a fines, aggregates and optionally a binder containing green agglomerates, which are provided with a cladding containing fine-grained carbon, such as coke, which plant a mixer for the ore, the aggregates and optionally existing binder, which is arranged downstream of a pelletizer, is characterized in that the pelletizer is designed as an agglomerating drum, which is provided at an area within its longitudinal extent with an addition device for the fuel.
  • a preferred embodiment is characterized in that the addition device is variable while changing the region of the longitudinal extension at which it discharges the fuel into the agglomeration drum.
  • the feed device is designed as a conveyor belt protruding into the agglomerating drum, wherein expedient the conveyor belt speed is variable or the position of the conveyor belt relative to the longitudinal extension of the agglomerating drum and thus the delivery area of the conveyor belt is variable.
  • augers or trough chain conveyors projecting into the agglomerating drum, which preferably can also be brought into the longitudinal direction of the agglomerating drum.
  • the mixer is expediently designed as a horizontal or vertical shaft mixer with blades arranged on the shaft or on the shafts.
  • the mixer with the agglomerating drum is formed ingetral, so that as soon as the ore is mixed with the additives and the optionally present binder, a direct transition takes place in the Agglomeriertrommel, whereby no separate conveyor from the mixer to Agglomeriertrommel is required.
  • the region of the longitudinal extension at which the feed device for the fuel admits it to the agglomeration drum lies between the first third and the last quarter of the longitudinal extent of the agglomerating drum, preferably between the half and two thirds of the longitudinal extent of the agglomerating drum.
  • FIGS. 1 to 4 each illustrate a variant in a schematic flow diagram representation.
  • ores and aggregates, wherein also fuel, e.g. Coke can be present as an additive, taken from bunkers 1 arranged side by side and from these to a conveyor, such as a conveyor belt 2, which conveys these materials to a mixer 3, which is preferably installed express as a high-performance mixer, as will be described later.
  • the materials are additionally added via a feed 4, a binder such as quicklime added.
  • a binder such as quicklime added.
  • water is added via a supply line 5 in a specific amount to optimize the mixing process and also the agglomeration process to be carried out subsequently in order to obtain a certain optimum moisture content.
  • the mixture discharged from the mixer 3 passes via a conveying device, such as a conveyor belt 6, to an agglomeration drum 7, in which the mixture is granulated and in which the required final moisture is also adjusted via a water feed 8.
  • the material passes from one feed end of the agglomerating drum 7 to the opposite discharge end from which they are conveyed further for further processing with the progressive formation of green agglomerates, which are to have a size preferably between 2 and 8 mm.
  • Such further processing is preferably carried out by sintering in a belt sintering plant.
  • the agglomerating drum 7 is arranged in the illustrated example in a horizontal position; However, it can also be arranged slightly inclined to increase the capacity. This also applies to the mixer 3, if this is designed as a drum mixer or high-performance mixer.
  • the green agglomerates - so-called green pellets - are obtained with their fine grain size upon reaching their optimum particle size, preferably fine coke, coated.
  • This adding device 9 is preferably designed as a conveyor belt whose discharge point 10 determines the region 11 to which the fuel is added to the green agglomerates.
  • the task of the fuel on the conveyor belt 9 is via a bunker 12, a weighing belt 13 and a feed chute 14.
  • the fuel may be provided with a fine-grained binder, e.g. with quicklime, hydrated lime or blast furnace slag with glassy structure.
  • the conveyor belt 9 preferably projects into the agglomerating drum 7 via one end thereof and extends in the longitudinal direction of the agglomeration drum 7.
  • the area 11 of the discharge of the fuel ie the area of the first contact of the fuel with the green agglomerates, variable, which can be accomplished by changing the conveyor belt speed, so that the Abschparabel for the fuel is changed.
  • This can also be done by moving the conveyor 9 in Longitudinal direction of the agglomerating drum 7 can be achieved, as illustrated in the drawing by a double arrow 15.
  • the particular advantage of the invention lies in the fact that the green agglomerates are stabilized in their shape immediately after they have been formed, specifically by the jacketing with the fuel taking place immediately thereafter.
  • a pelletizer e.g. a pelletizing plate to a Brennstoffummantelungs driven, which is either also designed as a pelletizing or as Agglomeriertrommel must be promoted. Since the green agglomerates are coated with fuel immediately after they have reached the correct size within the agglomerating drum 7 and are not subjected to intermediate conveying, accurate graining of the green agglomerates is to be achieved and destroyed as they are take place at an intermediate promotion, reliably avoided.
  • the invention thus makes it possible, in a particularly cost-effective manner, to process sintered raw mixtures with a high fines content into relatively coarse green agglomerates.
  • the grain size of the green agglomerates can be easily adjusted according to the invention by changing the range of contact of the green agglomerates with the fuel within the length of the agglomerating drum 7.
  • the coated green agglomerates thus formed have good gas permeability in a sintering machine, whereby high productivity of a sintering plant can be achieved.
  • the improved permeability also makes it possible to minimize the consumption of electrical energy in a sintering machine.
  • the sinter thus produced then has a high and stable quality and e.g.
  • the mixer 3 is formed as a high-performance mixer, namely, this has a horizontal, driven Shaft 16, on which radially outwardly extending blades 17 are arranged.
  • the use of such a high-performance mixer lowers the humidity of the green agglomerates to a minimum value, whereby an additional increase in productivity can be achieved on a sintering machine.
  • the materials in the mixture are distributed particularly homogeneously, whereby a uniform quality of the final product is ensured.
  • the mixer 3 is integrally formed with the agglomerating drum 7, i.
  • the mixture is introduced via the conveyor belt 2 directly into a drum, the first part of which acts as a mixer 3 and the further part of which acts as agglomerating drum 7, in which the addition of fine coke also takes place.
  • the agglomerating drum 7 is also integrally formed with the mixer 3, but the agglomerating drum 7 is fixed, i.e., fixed. stationary, is arranged on the foundation and at least one shaft 16 is arranged with blades 17 inside the Agglomeriertrommel. This shaft 16 with blades 17 also passes through the mixer 3 and is drivable.
  • the feed device 9 opens into the agglomerating drum 7 via an optionally placeable opening 18. According to this embodiment, mixing as well as agglomeration and sheathing take place in a single device-a mixed agglomerator-meeting the different mixing, agglomeration and sheathing requirements different design of the blades 17 in the individual areas of this Agglomeriertrommel 7 is taken into account.
  • 40% of the used grains of an iron ore to be processed have a size of less than 0.125 mm.
  • the humidity is 3 to 4%.
  • the materials introduced into the mixer 3 are added to water in the mixer, so that the moisture content of the mixture produced is between 5 and 6%.
  • the mixture thus prepared is introduced into the agglomerating drum 7, which additionally 8 t / h fine coke with about 10% moisture and a grain size less than 1 mm are supplied.
  • the grain size of the green agglomerates is between 2 to 8 mm.
  • the ore-green agglomerates produced in this way are outstandingly suitable for sintering as a result of the good permeability of these green agglomerates.
  • the invention is not limited to the production of green agglomerates from iron ore, but is also applicable to non-iron ores such as e.g. Lead ore or manganese ore applicable.

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  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
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  • General Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
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  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
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  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

A plant for the production of ore comprising a proportion of fines, additives and green agglomerates optionally containing a binder, provided with an outer coating consisting of a combustible containing fine-grained carbon, such as coke. In the plant, the ore is mixed with the additives and the optionally available binder. The mixture is pelletized and the green agglomerates thus formed are coated with the combustible, whereby the combustible is introduced into an agglomeration drum. In order to enable continual production of homogeneous-quality green agglomerates, the mixture is pelletized in the agglomeration drum and the combustible is added in an area of the longitudinal extension of the agglomeration drum where the size of the green agglomerates formed in the agglomeration drum is sufficient for further processing.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Erz mit einem Feinanteil, Zuschlagsstoffen und gegebenenfalls einen Binder enthaltenden Grün-Agglomeraten, die mit einer aus feinkörnigen Kohlenstoff enthaltenden Brennstoff, wie Koks, und gegebenenfalls einem Binder, gebildeten Ummantelung versehen sind, wobei das Erz mit den Zuschlagsstoffen und dem gegebenenfalls vorhandenen Binder durchmischt wird, die Mischung pelletiert und die so gebildeten Grün-Agglomerate unter Zugabe des Brennstoffs in einer Agglomeriertrommel mit dem Brennstoff ummantelt werden, sowie eine Anlage zur Durchführung des Verfahrens.The invention relates to a process for the production of ore with a fines, aggregates and optionally a binder-containing green agglomerates, which are provided with a fine-grained carbon-containing fuel, such as coke, and optionally a binder, formed casing, wherein the ore with the Aggregates and the optionally present binder is mixed, the mixture is pelletized and the green agglomerates thus formed are coated with the addition of the fuel in an agglomeration drum with the fuel, and a plant for carrying out the method.

Ein Verfahren dieser Art ist aus der EP A2 0 271 863 bekannt. Gemäß diesem Dokument erfolgt das Pelletieren des Erzes, das einen Feinanteil aufweist, der Zuschlagsstoffe und des Binders mit Hilfe von Pelletiertellern. Die so gebildeten Grün-Agglomerate werden anschließend in eine Rolliertrommel überbracht, in welcher sie mit Feinkoks ummantelt werden.A method of this kind is known from EP A2 0 271 863 known. According to this document, the ore, which has a fines content, is pelletized, the aggregates and the binder are pelletised. The green agglomerates thus formed are then transferred to a roller burnishing drum in which they are coated with fine coke.

Hierbei ist nachteilig, dass Pelletierteller nur eine beschränkte Kapazität aufweisen, d.h. es sind für eine größere und leistungsfähige Anlage eine Mehrzahl von Pelletiertellern vorzusehen, wogegen es genügt mit einer einzigen Agglomeriertrommel zum Ummanteln der in den Pelletiertellern gebildeten Grün-Agglomerate vorzusehen. Die Koppelung der Mehrzahl der Pelletierteller mit einer einzigen Agglomeriertrommel ist aufwendig, zumal eine Fördereinrichtung von jedem der Pelletierteller zur Agglomeriertrommel führen muss. Bei dieser Förderung kann es zur Zerstörung eines Teils der gebildeten Grün-Agglomerate kommen. Weiters ist es schwierig, dieses bekannte Verfahren kontinuierlich durchzuführen, es kommt in der Regel zu ungleichmäßigen Durchsatzmengen je Zeiteinheit an der Agglomeriertrommel, je nach dem, wie die Pelletierteller beschickt werden und wie der Pelletiervorgang auf den Pelletiertellern abläuft. Ein weiterer Nachteil ist darin zu sehen, dass die Umstellung auf andere Erze bzw. andere Korngrößenverteilungen bzw. mit unterschiedlichen Feuchtegehalten etc., aufwendig ist, zumal die Zeit zur Bildung der Grün-Agglomerate auf den Pelletiertellern in solchen Fällen variiert.A disadvantage here is that pelletizing plates have only a limited capacity, i. it is for a larger and more efficient system to provide a plurality of pelletizing plates, whereas it is sufficient to provide with a single agglomerating drum for wrapping the green agglomerates formed in the pelletizing plates. The coupling of the plurality of pelletizing plates with a single agglomerating drum is expensive, especially since a conveyor must lead from each of the pelletizing plates to the agglomerating drum. In this promotion, it may lead to the destruction of part of the green agglomerates formed. Furthermore, it is difficult to carry out this known method continuously, it usually comes to uneven flow rates per unit time at the Agglomeriertrommel, depending on how the pelletizing are charged and how the pelleting process runs on the pelletizing plates. Another disadvantage is the fact that the conversion to other ores or other grain size distributions or with different moisture contents, etc., is complicated, especially since the time to form the green agglomerates on the pelletizing plates varies in such cases.

Die Erfindung bezweckt die Vermeidung dieser Nachteile und Schwierigkeiten und stellt sich die Aufgabe, ein Verfahren bzw. eine Anlage zur Durchführung des Verfahrens zu schaffen, welche einen gleichmäßigen und kontinuierlichen Ablauf der Herstellung der Grün-Agglomerate gewährleisten. Zudem soll das Verfahren nur eine wenig aufwendige Anlage auch für große Durchsatzmengen pro Zeiteinheit erfordern. Es ist ein besonderes Anliegen der Erfindung, eine Umstellung auf unterschiedliche Betriebsweisen - hervorgerufen durch unterschiedliche Feinerzzusammensetzungen bzw. unterschiedliche Zuschlagsstoffe etc., - in besonders einfacher Weise zu ermöglichen.The invention aims to avoid these disadvantages and difficulties and has as its object to provide a method and a system for carrying out the method, which ensure a uniform and continuous process of producing the green agglomerates. In addition, the process should require only a little complex system for large throughputs per unit time. It's a special one Object of the invention, a change to different modes of operation - caused by different Feinerzzusammensetzungen or different additives, etc., - To allow in a particularly simple manner.

Diese Aufgabe wird erfindungsgemäß bei einem Verfahren der eingangs beschriebenen Art dadurch gelöst, dass die Mischung in der Agglomeriertrommel pelletiert wird und der Brennstoff an einem Bereich der Längserstreckung der Agglomeriertrommel zugegeben wird, an der die sich in der Agglomeriertrommel bildenden Grün-Agglomerate die für eine Weiterverarbeitung gewünschte Größe aufweisen.This object is achieved in a method of the type described above in that the mixture is pelletized in the Agglomeriertrommel and the fuel is added at a region of the longitudinal extent of Agglomeriertrommel at which forming in the Agglomeriertrommel green agglomerates for further processing have desired size.

Es ist für dieses Verfahren vorteilhaft, wenn das Mischen intensiv erfolgt, was zweckmäßig unter Durchschaufeln der zu mischenden Materialien durchgeführt wird, und zwar vorzugsweise unter Verwendung eines Horizontal- oder Vertikalwellenmischers.It is advantageous for this process if the mixing takes place intensively, which is expediently carried out by passing through the materials to be mixed, preferably using a horizontal or vertical shaft mixer.

Eine besonders einfache Anpassung des erfindungsgemäßen Verfahrens an unterschiedliche Betriebsweisen, unterschiedliche Erze, unterschiedliche Erzzusammensetzungen etc., ist dadurch gekennzeichnet, dass der Zugabebereich des Brennstoffes in die Agglomeriertrommel über die Länge der Agglomeriertrommel in Abhängigkeit der Beschaffenheit und der Größe der Grün-Agglomerate variiert wird.A particularly simple adaptation of the method according to the invention to different modes of operation, different ores, different ore compositions, etc., is characterized in that the addition area of the fuel into the agglomerating drum is varied over the length of the agglomerating drum depending on the nature and size of the green agglomerates.

Eine Anlage zur Herstellung von Erz mit einem Feinanteil, Zuschlagsstoffen und gegebenenfalls einen Binder enthaltenden Grün-Agglomeraten, die mit einer aus feinkörnigen Kohlenstoff enthaltenden Brennstoff, wie Koks, gebildeten Ummantelung versehen sind, welche Anlage einen Mischer für das Erz, die Zuschlagsstoffe und den gegebenenfalls vorhandenen Binder aufweist, dem eine Pelletiereinrichtung nachgeordnet ist, ist dadurch gekennzeichnet, dass die Pelletiereinrichtung als Agglomeriertrommel ausgebildet ist, die an einem Bereich innerhalb ihrer Längserstreckung mit einer Zugabeeinrichtung für den Brennstoff versehen ist.A plant for the production of ore with a fines, aggregates and optionally a binder containing green agglomerates, which are provided with a cladding containing fine-grained carbon, such as coke, which plant a mixer for the ore, the aggregates and optionally existing binder, which is arranged downstream of a pelletizer, is characterized in that the pelletizer is designed as an agglomerating drum, which is provided at an area within its longitudinal extent with an addition device for the fuel.

Eine bevorzugte Ausführungsform ist dadurch gekennzeichnet, dass die Zugabeeinrichtung unter Veränderung des Bereichs der Längserstreckung, an der diese den Brennstoff in die Agglomeriertrommel abgibt, variabel ist.A preferred embodiment is characterized in that the addition device is variable while changing the region of the longitudinal extension at which it discharges the fuel into the agglomeration drum.

Vorzugsweise ist die Zugabeeinrichtung als in die Agglomeriertrommel ragendes Förderband ausgebildet, wobei zweckmäßig die Förderbandgeschwindigkeit variabel ist oder die Lage des Förderbandes gegenüber der Längserstreckung der Agglomeriertrommel und damit der Abgabebereich des Förderbandes veränderbar ist.Preferably, the feed device is designed as a conveyor belt protruding into the agglomerating drum, wherein expedient the conveyor belt speed is variable or the position of the conveyor belt relative to the longitudinal extension of the agglomerating drum and thus the delivery area of the conveyor belt is variable.

Als Zugabeeinrichtungen können auch in die Agglomeriertrommel ragende Förderschnecken oder Trogkettenförderer vorgesehen sein, die vorzusgweise ebenfalls in Längsrichtung der Agglomeriertommel verbringbar sind.As feed devices, it is also possible to provide augers or trough chain conveyors projecting into the agglomerating drum, which preferably can also be brought into the longitudinal direction of the agglomerating drum.

Für eine gute Durchmischung und damit eine günstige Grün-Agglomeratbildung ist zweckmäßig der Mischer als Horizontal- oder Vertikalwellenmischer mit an der Welle bzw. an den Wellen angeordneten Schaufeln ausgebildet.For a good mixing and thus a favorable green agglomeration, the mixer is expediently designed as a horizontal or vertical shaft mixer with blades arranged on the shaft or on the shafts.

Nach einer bevorzugten Ausführungsform ist der Mischer mit der Agglomeriertrommel ingetral ausgebildet, sodass sobald das Erz mit den Zuschlagsstoffen und dem gegebenenfalls vorhandenen Binder fertiggemischt ist, ein direkter Übergang in die Agglomeriertrommel stattfindet, wodurch keine eigene Fördereinrichtung vom Mischer zur Agglomeriertrommel erforderlich ist.According to a preferred embodiment of the mixer with the agglomerating drum is formed ingetral, so that as soon as the ore is mixed with the additives and the optionally present binder, a direct transition takes place in the Agglomeriertrommel, whereby no separate conveyor from the mixer to Agglomeriertrommel is required.

Es hat sich für die Durchführung des erfindungsgemäßen Verfahrens als zweckmäßig herausgestellt, wenn der Bereich der Längserstreckung, an dem die Zugabeeinrichtung für den Brennstoff diesen in die Agglomeriertrommel zugibt, zwischen dem ersten Drittel und dem letzten Viertel der Längserstreckung der Agglomeriertrommel liegt, vorzugsweise zwischen der Hälfte und zwei Drittel der Längserstreckung der Agglomeriertrommel.It has proved to be expedient for carrying out the method according to the invention if the region of the longitudinal extension at which the feed device for the fuel admits it to the agglomeration drum lies between the first third and the last quarter of the longitudinal extent of the agglomerating drum, preferably between the half and two thirds of the longitudinal extent of the agglomerating drum.

Die Erfindung ist nachfolgend anhand der Zeichnung an mehreren Ausführungsbeispielen näher erläutert, wobei die Fig. 1 bis 4 jeweils eine Variante in schematischer Fließschema-Darstellung veranschaulichen.The invention is explained in more detail below with reference to the drawing of several embodiments, wherein FIGS. 1 to 4 each illustrate a variant in a schematic flow diagram representation.

Gemäß der in Fig. 1 dargestellten Ausführungsform werden Erze und Zuschlagsstoffe, wobei auch Brennstoff, wie z.B. Koks, als Zuschlagsstoff vorhanden sein kann, von nebeneinander angeordneten Bunkern 1 entnommen und gelangen von diesen auf eine Fördereinrichtung, wie ein Förderband 2, welches diese Materialien zu einem Mischer 3 fördert, der vorzugweise als Hochleistungsmischer, wie später noch beschrieben wird, augebildet ist.According to the embodiment shown in Fig. 1, ores and aggregates, wherein also fuel, e.g. Coke can be present as an additive, taken from bunkers 1 arranged side by side and from these to a conveyor, such as a conveyor belt 2, which conveys these materials to a mixer 3, which is preferably ausgebildet as a high-performance mixer, as will be described later.

Unmittelbar vor der Aufgabe dieser Materialien in den Mischer 3 wird den Materialien noch zusätzlich über eine Zuführung 4 ein Binder, wie z.B. Branntkalk, zugegeben. Im Mischer 3 wird zur Optimierung des Mischvorganges und auch des nachfolgend noch durchzuführenden Agglomeriervorganges Wasser über eine Zuleitung 5 in bestimmter Menge zugegeben, um eine bestimmte optimale Feuchte zu erhalten.Immediately before the task of these materials in the mixer 3, the materials are additionally added via a feed 4, a binder such as quicklime added. In the mixer 3, water is added via a supply line 5 in a specific amount to optimize the mixing process and also the agglomeration process to be carried out subsequently in order to obtain a certain optimum moisture content.

Die aus dem Mischer 3 ausgetragene Mischung gelangt über eine Fördereinrichtung, wie ein Förderband 6, zu einer Agglomeriertrommel 7, in der die Mischung granuliert wird und in der auch die erforderliche Endfeuchte über eine Wasserzuführung 8 eingestellt wird. Das Material gelangt unter zunehmender Bildung von Grün-Agglomeraten, die schlussendlich vorzugsweise eine Größe zwischen 2 und 8 mm aufweisen sollen, von einem Aufgabe-Ende der Agglomeriertrommel 7 zum gegenüberliegenden Ausgabe-Ende, von wo sie zur Weiterverarbeitung weitergefördert werden. Eine solche Weiterverarbeitung erfolgt vorzugsweise durch Sintern in einer Bandsinteranlage.The mixture discharged from the mixer 3 passes via a conveying device, such as a conveyor belt 6, to an agglomeration drum 7, in which the mixture is granulated and in which the required final moisture is also adjusted via a water feed 8. The material passes from one feed end of the agglomerating drum 7 to the opposite discharge end from which they are conveyed further for further processing with the progressive formation of green agglomerates, which are to have a size preferably between 2 and 8 mm. Such further processing is preferably carried out by sintering in a belt sintering plant.

Die Agglomeriertrommel 7 ist im dargestellten Beispiel in horizontaler Lage angeordnet; sie kann jedoch auch zur Erhöhung der Förderleistung leicht geneigt angeordnet sein. Dies gilt auch für den Mischer 3, wenn dieser als Trommelmischer oder Hochleistungsmischer ausgebildet ist.The agglomerating drum 7 is arranged in the illustrated example in a horizontal position; However, it can also be arranged slightly inclined to increase the capacity. This also applies to the mixer 3, if this is designed as a drum mixer or high-performance mixer.

Um die Bildung optimaler Grün-Agglomerate mit einer Korngröße von ca. zwischen 2 und 8 mm, insbesondere bezüglich ihrer maximalen Korngröße, beeinflussen zu können, werden die Grün-Agglomerate - sogenannte Grün-Pellets - bei Erreichen ihrer optimalen Korngröße mit einem feinkörnigen Brennstoff, vorzugsweise Feinkoks, ummantelt. Dies geschieht erfindungsgemäß innerhalb der Agglomeriertrommel 7, in der eine Zugabeeinrichtung 9 für den Brennstoff an einer gewissen Stelle der Längserstreckung der Agglomeriertrommel 7 vorgesehen ist. Diese Zugabevorrichtung 9 ist vorzugsweise als Förderband ausgebildet, dessen Abwurfstelle 10 den Bereich 11, an den der Brennstoff den Grün-Agglomeraten beigegeben wird, festlegt. Die Aufgabe des Brennstoffs auf das Förderband 9 erfolgt über einen Bunker 12, ein Wiegeband 13 und eine Aufgabeschurre 14. Der Brennstoff kann mit einem feinkörnigen Binder versehen sein, wie z.B. mit Branntkalk, Hydratkalk oder Hochofenschlacke mit glasiger Struktur.In order to be able to influence the formation of optimum green agglomerates with a grain size of approximately between 2 and 8 mm, in particular with respect to their maximum grain size, the green agglomerates - so-called green pellets - are obtained with their fine grain size upon reaching their optimum particle size, preferably fine coke, coated. According to the invention, this takes place within the agglomeration drum 7, in which an addition device 9 for the fuel is provided at a certain point of the longitudinal extension of the agglomeration drum 7. This adding device 9 is preferably designed as a conveyor belt whose discharge point 10 determines the region 11 to which the fuel is added to the green agglomerates. The task of the fuel on the conveyor belt 9 is via a bunker 12, a weighing belt 13 and a feed chute 14. The fuel may be provided with a fine-grained binder, e.g. with quicklime, hydrated lime or blast furnace slag with glassy structure.

Das Förderband 9 ragt vorzugsweise über ein Ende der Agglomeriertrommel 7 in diese hinein und erstreckt sich in Längsrichtung der Agglomeriertrommel 7.The conveyor belt 9 preferably projects into the agglomerating drum 7 via one end thereof and extends in the longitudinal direction of the agglomeration drum 7.

Anstelle des Förderbandes 9 könnten auch andere Zugabeeinrichtungen vorgesehen sein, beispielsweise ein Schneckenförderer oder ein Trogkettenförderer etc.Instead of the conveyor belt 9, other feed devices could also be provided, for example a screw conveyor or a trough chain conveyor etc.

Vorteilhaft ist der Bereich 11 des Abwurfs des Brennstoffs, d.h. der Bereich der ersten Kontaktnahme des Brennstoffs mit den Grün-Agglomeraten, variierbar, was durch Änderung der Förderbandgeschwindigkeit bewerkstelligt werden kann, sodass die Abwurfparabel für den Brennstoff geändert wird. Dies kann auch durch Verbringen des Förderbands 9 in Längsrichtung der Agglomeriertrommel 7 erzielt werden, wie dies in der Zeichnung durch einen Doppelpfeil 15 veranschaulicht ist.Advantageously, the area 11 of the discharge of the fuel, ie the area of the first contact of the fuel with the green agglomerates, variable, which can be accomplished by changing the conveyor belt speed, so that the Abwurfparabel for the fuel is changed. This can also be done by moving the conveyor 9 in Longitudinal direction of the agglomerating drum 7 can be achieved, as illustrated in the drawing by a double arrow 15.

Ab dem Bereich der ersten Kontaktnahme der Grün-Agglomerate mit dem Brennstoff werden diese mit dem Brennstoff ummantelt und dadurch stabilisiert; ein Weiterwachsen der Grün-Agglomerate wird somit verhindert. Ein gegebenenfalls vorhandener gröberer Anteil des Brennstoffs, also des vorzusgweise eingesetzten Kokses, wird zwischen den ummantelten Grün-Agglomeraten verteilt.From the area of the first contact of the green agglomerates with the fuel they are coated with the fuel and thereby stabilized; further growth of the green agglomerates is thus prevented. An optionally present coarser fraction of the fuel, that is to say of the coke used, is distributed between the coated green agglomerates.

Der besondere Vorteil der Erfindung liegt darin, dass die Grün-Agglomerate sofort nachdem sie gebildet sind in ihrer Form stabilisiert werden, und zwar durch das unmittelbar anschließend stattfindende Ummanteln mit dem Brennstoff. Dies bedeutet, dass die Grün-Agglomerate nicht von einer Pelletiereinrichtung, wie z.B. einem Pelletierteller zu einer Brennstoffummantelungseinrichtung, die entweder ebenfalls als Pelletierteller oder als Agglomeriertrommel ausgebildet ist, gefördert werden müssen. Dadurch, dass die Grün-Agglomerate unmittelbar nachdem sie die richtige Größe innerhalb der Agglomeriertrommel 7 erreicht haben, mit Brennstoff ummantelt werden und nicht einer Zwischenförderung ausgesetzt sind, ist eine genaue Körnung der Grün-Agglomerate zu erzielen und es ist eine Zerstörung derselben, wie sie bei einer Zwischenförderung stattfinden kann, zuverlässig vermieden.The particular advantage of the invention lies in the fact that the green agglomerates are stabilized in their shape immediately after they have been formed, specifically by the jacketing with the fuel taking place immediately thereafter. This means that the green agglomerates are not affected by a pelletizer, e.g. a pelletizing plate to a Brennstoffummantelungseinrichtung, which is either also designed as a pelletizing or as Agglomeriertrommel must be promoted. Since the green agglomerates are coated with fuel immediately after they have reached the correct size within the agglomerating drum 7 and are not subjected to intermediate conveying, accurate graining of the green agglomerates is to be achieved and destroyed as they are take place at an intermediate promotion, reliably avoided.

Die Erfindung ermöglicht somit auf besonders kostengünstige Weise die Verarbeitung von Sinterrohmischungen mit einem hohen Feinstanteil zu relativ groben Grün-Agglomeraten. Die Korngröße der Grün-Agglomerate kann erfindungsgemäß leicht durch Verändern des Bereichs der Kontaktnahme der Grün-Agglomerate mit dem Brennstoff innerhalb der Länge der Agglomeriertrommel 7 eingestellt werden. Die so gebildeten ummantelten Grün-Agglomerate weisen eine gute Durchgasbarkeit in einer Sintermaschine auf, wodurch eine hohe Produktivität einer Sinteranlage erzielt werden kann. Die verbesserte Permeabilität ermöglicht auch den Verbrauch an elektrischer Energie in einer Sintermaschine zu minimieren. Der so produzierte Sinter hat dann eine hohe und stabile Qualität und z.B. für Eisenerz einen niedrigen FeO-Anteil, woraus eine gute Reduzierbarkeit in einem Hochofen folgt. Durch die gute Permeabilität der nunmehr vorwiegend aus Grün-Agglomeraten bestehenden Schüttung ist der Anteil an Falschluft an den Prozessgasen bei der Sinterung gering.The invention thus makes it possible, in a particularly cost-effective manner, to process sintered raw mixtures with a high fines content into relatively coarse green agglomerates. The grain size of the green agglomerates can be easily adjusted according to the invention by changing the range of contact of the green agglomerates with the fuel within the length of the agglomerating drum 7. The coated green agglomerates thus formed have good gas permeability in a sintering machine, whereby high productivity of a sintering plant can be achieved. The improved permeability also makes it possible to minimize the consumption of electrical energy in a sintering machine. The sinter thus produced then has a high and stable quality and e.g. for iron ore a low FeO content, which results in a good reducibility in a blast furnace. Due to the good permeability of the now predominantly consisting of green agglomerates bed the proportion of false air to the process gases in the sintering is low.

Gemäß der in Fig. 2 dargestellten Auführungsform ist der Mischer 3 als Hochleistungsmischer augebildet, und zwar weist dieser eine horizontale, angetriebene Welle 16 auf, an der sich radial nach außen erstreckende Schaufeln 17 angeordnet sind. Die Verwendung eines solchen Hochleistungsmischers lässt die Feuchte der Grün-Agglomerate auf einen Minimalwert absenken, wodurch eine zusätzliche Steigerung der Produktivität auf einer Sintermaschine erzielt werden kann. Weiters werden die Materialien in der Mischung besonders homogen verteilt, wodurch eine gleichmäßige Qualität des Endproduktes sichergestellt ist.According to the Auführungsform shown in Fig. 2, the mixer 3 is formed as a high-performance mixer, namely, this has a horizontal, driven Shaft 16, on which radially outwardly extending blades 17 are arranged. The use of such a high-performance mixer lowers the humidity of the green agglomerates to a minimum value, whereby an additional increase in productivity can be achieved on a sintering machine. Furthermore, the materials in the mixture are distributed particularly homogeneously, whereby a uniform quality of the final product is ensured.

Gemäß der in Fig. 3 dargestellten Variante ist der Mischer 3 mit der Agglomeriertrommel 7 integral ausgebildet, d.h. es wird die Mischung über das Förderband 2 direkt in eine Trommel eingebracht, deren erster Teil als Mischer 3 fungiert und deren weiterer Teil als Agglomeriertrommel 7 fungiert, in der auch die Zugabe von Feinkoks erfolgt.According to the variant shown in Fig. 3, the mixer 3 is integrally formed with the agglomerating drum 7, i. The mixture is introduced via the conveyor belt 2 directly into a drum, the first part of which acts as a mixer 3 and the further part of which acts as agglomerating drum 7, in which the addition of fine coke also takes place.

In der in Fig. 4 dargestellten Ausführungsform ist ebenfalls die Agglomeriertrommel 7 mit dem Mischer 3 integral ausgebildet, wobei jedoch die Agglomeriertrommel 7 feststehend, d.h. ortsfest, am Fundament angeordnet ist und mindestens eine Welle 16 mit Schaufeln 17 im Inneren der Agglomeriertrommel angeordnet ist. Diese Welle 16 mit Schaufeln 17 durchsetzt auch den Mischer 3 und ist antreibbar. Die Zugabeeinrichtung 9 mündet über eine wahlweise plazierbare Öffnung 18 in die Agglomeriertrommel 7. Gemäß dieser Ausführungsform erfolgt sowohl das Mischen als auch das Agglomerieren als auch das Ummanteln in einer einzigen Vorrichtung -einem Mischagglomerator -, wobei den unterschiedlichen Anforderungen beim Mischen, Agglomerieren und Ummanteln durch unterschiedliche Ausbildung der Schaufeln 17 in den einzelnen Bereichen dieser Agglomeriertrommel 7 Rechnung getragen wird.In the embodiment shown in Fig. 4, the agglomerating drum 7 is also integrally formed with the mixer 3, but the agglomerating drum 7 is fixed, i.e., fixed. stationary, is arranged on the foundation and at least one shaft 16 is arranged with blades 17 inside the Agglomeriertrommel. This shaft 16 with blades 17 also passes through the mixer 3 and is drivable. The feed device 9 opens into the agglomerating drum 7 via an optionally placeable opening 18. According to this embodiment, mixing as well as agglomeration and sheathing take place in a single device-a mixed agglomerator-meeting the different mixing, agglomeration and sheathing requirements different design of the blades 17 in the individual areas of this Agglomeriertrommel 7 is taken into account.

Gemäß einem Ausführungsbeispiel weisen 40 % der eingesetzten Körner eines zu verarbeitenden Eisenerzes eine Größe von weniger als 0,125 mm auf. Es werden 460 t/h an Rohmaterialien, d.h. an Eisenerz, Zuschlagsstoffen und Binder in die Mischeinrichtung 3 eingebracht. Die Feuchte beträgt 3 bis 4 %. Den in den Mischer 3 eingebrachten Materialen wird im Mischer Wasser zugesetzt, sodass die Feuchte der hergestellten Mischung zwischen 5 und 6 % liegt.According to one embodiment, 40% of the used grains of an iron ore to be processed have a size of less than 0.125 mm. There are 460 t / h of raw materials, i. introduced to iron ore, aggregates and binder in the mixing device 3. The humidity is 3 to 4%. The materials introduced into the mixer 3 are added to water in the mixer, so that the moisture content of the mixture produced is between 5 and 6%.

Die so hergestellte Mischung wird in die Agglomeriertrommel 7 eingebracht, der zusätzlich noch 8 t/h Feinkoks mit etwa 10 % Feuchte und einer Korngröße kleiner 1 mm zugeführt werden. Dies ergibt einen Ausstoß an Grün-Agglomeraten von 468 t/h (trocken) mit einer Feuchte von ca. 6 %. Die Korngröße der Grün-Agglomerate liegt zwischen 2 bis 8 mm.The mixture thus prepared is introduced into the agglomerating drum 7, which additionally 8 t / h fine coke with about 10% moisture and a grain size less than 1 mm are supplied. This results in an output of green agglomerates of 468 t / h (dry) with a moisture content of about 6%. The grain size of the green agglomerates is between 2 to 8 mm.

Die so hergestellten Erz-Grün-Agglomerate eignen sich hervorragend zum Sintern in Folge der guten Permeabilität dieser Grün-Agglomerate.The ore-green agglomerates produced in this way are outstandingly suitable for sintering as a result of the good permeability of these green agglomerates.

Die Erfindung beschränkt sich nicht auf das Herstellen von Grün-Agglomeraten aus Eisenerz, sondern ist auch für Nichteisenerze, wie z.B. Bleierz oder Manganerz anwendbar.The invention is not limited to the production of green agglomerates from iron ore, but is also applicable to non-iron ores such as e.g. Lead ore or manganese ore applicable.

Claims (13)

  1. A process for the production of ore comprising green agglomerates containing an amount of fines, fluxes and optionally a binder, which green agglomerates are provided with an outer coating formed from a combustible containing fine-grained carbon, such as coke, and optionally a binder, wherein the ore is mixed with the fluxes and the optionally provided binder, the mixture is pelletized and the green agglomerates thus formed are coated with the combustible in an agglomeration drum (7), with the combustible being added, characterized in that the mixture is pelletized in the agglomeration drum (7) and the combustible is added in an area (11) of the longitudinal extension of the agglomeration drum (7) where the green agglomerates forming in the agglomeration drum (7) have the desired size for further processing.
  2. A process according to claim 1, characterized in that mixing is effected by scooping, preferably using a horizontal or vertical shaft mixer (3).
  3. A process according to claim 1 or 2, characterized in that the area (11) of adding the combustible into the agglomeration drum (7) is varied throughout the length of the agglomeration drum (7), depending on the nature of the green agglomerates.
  4. A plant for the production of ore comprising green agglomerates containing an amount of fines, fluxes and optionally a binder, which green agglomerates are provided with an outer coating formed from a combustible containing fine-grained carbon, such as coke, which plant comprises a mixer (3) for the ore, the fluxes and the optionally provided binder, with a pelletizing device (7) arranged downstream thereof, characterized in that the pelletizing device is designed as an agglomeration drum (7) which, in an area (11) within its longitudinal extension, is provided with a charging means (9) for the combustible.
  5. A plant according to claim 4, characterized in that the charging means (9) is variable, whereby the area (11) of the longitudinal extension where said means delivers the combustible into the agglomeration drum (7) is changed.
  6. A plant according to claim 4 or 5, characterized in that the charging means is designed as a conveyor belt (9) projecting into the agglomeration drum (7).
  7. A plant according to claim 6, characterized in that the conveyor belt speed is variable.
  8. A plant according to claim 6 or 7, characterized in that the position of the conveyor belt (9) relative to the longitudinal extension of the agglomeration drum (7) and hence the output area (11) of the conveyor belt are changeable.
  9. A plant according to claim 6, characterized in that the charging means is designed as a conveying screw or drag-link conveyor projecting into the agglomeration drum and preferably can be moved in the longitudinal direction of the agglomeration drum.
  10. A plant according to one or several of claims 4 to 9, characterized in that the mixer (3) is designed as a horizontal or vertical shaft mixer with blades (17) arranged on the shaft (16) or on the shafts, respectively.
  11. A plant according to one or several of claims 4 to 10, characterized in that the mixer (3) is formed integrally with the agglomeration drum (7).
  12. A plant according to claim 11, characterized in that the mixer (3) and the agglomeration drum (7) are designed as a stationary mixing agglomerator, at least one mixing tool, such as a shaft (16) comprising blades (17), is provided in the mixer (3) and in the agglomeration drum (7) and the charging means (9) for the coat combustible runs into the agglomeration drum (7) via an opening (18) thereof.
  13. A plant according to one or several of claims 4 to 12, characterized in that the area (11) of the longitudinal extension, where the charging means (9) for the combustible adds the same into the agglomeration drum, is located between the first third and the final fourth of the longitudinal extension of the agglomeration drum (7), preferably between the half and two thirds of the longitudinal extension of the agglomeration drum (7).
EP04737378A 2003-07-16 2004-07-09 Method for the production of ore with green agglomerates containing a proportion of fines Expired - Lifetime EP1646731B1 (en)

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WO2005007899A1 (en) 2005-01-27
DE502004005839D1 (en) 2008-02-14
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CN1823170A (en) 2006-08-23
RU2363741C2 (en) 2009-08-10
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BRPI0412587B1 (en) 2013-06-25
US7645321B2 (en) 2010-01-12
US20060112786A1 (en) 2006-06-01
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BRPI0412587A (en) 2006-09-19
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US20100047381A1 (en) 2010-02-25
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US8273287B2 (en) 2012-09-25
KR101178362B1 (en) 2012-08-29

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