EP4100550B1 - Procédé de granulation d'un laitier métallurgique - Google Patents

Procédé de granulation d'un laitier métallurgique Download PDF

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Publication number
EP4100550B1
EP4100550B1 EP21703626.8A EP21703626A EP4100550B1 EP 4100550 B1 EP4100550 B1 EP 4100550B1 EP 21703626 A EP21703626 A EP 21703626A EP 4100550 B1 EP4100550 B1 EP 4100550B1
Authority
EP
European Patent Office
Prior art keywords
air
slag
work chamber
section
working chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP21703626.8A
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German (de)
English (en)
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EP4100550A1 (fr
Inventor
Rolf Degel
Timm Lux
Alexander BERGS
Nikolaus Peter Kurt Borowski
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SMS Group GmbH
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SMS Group GmbH
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Publication of EP4100550A1 publication Critical patent/EP4100550A1/fr
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Classifications

    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/04—Working-up slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C21B3/08—Cooling slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/02—Physical or chemical treatment of slags
    • C21B2400/022—Methods of cooling or quenching molten slag
    • C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/062—Jet nozzles or pressurised fluids for cooling, fragmenting or atomising slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery

Definitions

  • the invention relates to a method for granulating a metallurgical slag, in which liquid slag is atomized by blowing with air and the slag particles granulated in this way are collected, the atomization being carried out by blowing the liquid slag with a heated air jet free from the addition of water and is fed to a working chamber, the granulated slag particles being collected in the bottom area of the working chamber, the air escaping from the working chamber being either fed to a heat exchanger which preheats the air jet with which the liquid slag is blown, or is circulated directly in order to to atomize the liquid slag, and wherein a single working chamber is used for the process, wherein the supply of the liquid slag and its blowing with air takes place in a first section of the working chamber and that the granulated slag particles collect in a second section of the working chamber, which is spaced from the first section, the air escaping from the working chamber being removed from the working chamber in the area of
  • a procedure of the generic type is from the CN 1 773 204 A known. Similar and other procedures reveal the CN 206 570 358 U , the CN 103 773 911 A , the DE 10 2009 042 874 A1 and the US 2,255,206 A .
  • the slag is granulated in a two-stage process, which has two successive rotating cylinders.
  • the slag is atomized using an air stream and blown into a first rotary tube, which serves as the first waste heat boiler.
  • the still warm granules are then conveyed into a second rotary tube, where they are further cooled.
  • the warm exhaust air from both rotary tubes is used to recover energy.
  • a first step only very coarse granulation is carried out and the particles are then treated in an intermediate grinding step. High-temperature grinding is complex and expensive.
  • the liquid slag is finely atomized using a blower and then granulated in flight.
  • the slag is usually atomized with water injection, i.e. H. the slag is sprayed with water.
  • the granulated particles are then sufficiently cooled when they hit the ground and have a spherical shape.
  • many of the previously known processes are uneconomical, which is why they are not used in industrial practice.
  • the invention is based on the object of developing a method of the type mentioned in such a way that the quality of the granules can be increased and the costs of their production can be further reduced, with particular consideration being given to the energy costs that have to be used to carry out the method.
  • the aim is to ensure high quality of the granulate and work as energy-efficiently as possible.
  • the solution to this problem by the invention is characterized in that part of the energy contained in the escaping air is used to supply a consumer, the consumer being a steam generator.
  • the slag is preferably kept free from the addition of water from the feed until it is deposited in the bottom area of the working chamber. In this respect, pure dry granulation is envisaged.
  • the air with which the liquid slag is blown is preferably preheated to at least 60 ° C, preferably to at least 80 ° C, particularly preferably to at least 100 ° C and very preferably to at least 120 ° C, or the air is at this temperature on.
  • the air After the liquid slag has been atomized with the air, the air preferably has a temperature of at least 250 ° C, particularly preferably at least 400 ° C.
  • the steam generator is preferably connected to a steam turbine generator system for generating electrical energy.
  • the granulated slag particles are blown with a further air stream in order to heat the air, the heated air being fed to a heat exchanger;
  • the slag particles are also cooled.
  • the heat obtained in the heat exchanger can be used to supply a consumer;
  • a steam generator is possible as a consumer, which is preferably connected to a steam turbine generator system for generating electrical energy, or a heater with which systems or buildings are heated.
  • the metallurgical slag is preferably a non-ferrous slag.
  • the liquid slag is supplied and blown with air in a first section of the working chamber (in particular in the front area of the working chamber) and that the granulated slag particles collect in a second section of the working chamber (in particular in the rear area of the working chamber), which is spaced from the first section, the air escaping from the working chamber being removed from the working chamber in the area of the first section.
  • the first section and the second section of the working chamber are separated from one another by a baffle plate arranged in the ceiling area of the working chamber.
  • the removal point of the escaping air is advantageously located vertically above the point of supply of the liquid slag and its blowing with air. This essentially means that the escaping air, seen in the top view, leaves the working chamber at the location where it was entered.
  • a slight offset of the supply point and the escape point is also possible, but this is preferably not larger than 2 m, preferably not larger than 1 m.
  • the air After escaping from the working chamber, the air can first be guided vertically upwards, then deflected through 180°, then guided vertically downwards and then again fed to the working chamber via the fan. This creates the further possibility that particles that are still in the air leave the air and that there is sufficient extension that can be used for heat exchange from the hot air.
  • This concept also includes the possibility that the air is first deflected by 90° after it has escaped from the working chamber, then the heat exchange described takes place, which is then followed by a further deflection by 90° for the purpose of guiding it vertically downwards.
  • Optimum removal or disposal of the produced granules or defective products is favored if a receiving or removal element for defective products is arranged in the first section of the working chamber and at least one receiving or removal element for granulated slag particles is arranged in the second section of the working chamber.
  • the floor of the working chamber is divided into several sections, with two floor areas, each inclined in opposite directions, collecting granulated slag particles with a specific parameter (in particular a specific size).
  • the granules can then be removed below the two inclined floor areas (this is in Figure 4 shown). This means the granules can be separated into different classes.
  • the proposed method therefore results in dry granulation with preheated air, whereby on the one hand the slag is finely atomized and granulated so that a salable product is created. It can also be used for the atomization of heated air that has been preheated through energy recovery. According to a preferred embodiment of the invention, the air used for atomization circulates in the system. The efficiency of the entire system is thus increased. Granulation takes place in a single process step, so that there are advantages compared to some of the previously known solutions (see above).
  • the dry granulation according to the invention has the significant advantage that less energy escapes from the process and the efficiency of energy recovery can thus be improved.
  • the liquid slag is atomized in a dry air stream without fiber formation or with less fiber formation.
  • the process is suitable for use in many pyrometallurgical processes that produce slag.
  • Application to non-ferrous slags is particularly preferred.
  • the proposed solution can be used to optimize the energy required for the metallurgical process. This is achieved by recovering the energy contained in the slag that would otherwise be lost.
  • the present invention is based on combined dry granulation with energy recovery.
  • FIG. 1 An embodiment of the invention.
  • Liquid slag 1 is supplied to the air stream 2, which is generated by a blower 10.
  • the slag 1 atomized using air 2 (which has a temperature of approx. 1,300 ° C present) reaches a working chamber 4 in which granulated slag particles 3 form in the dry air flow. These fall into the bottom area of the working chamber 4 and can be transported away below it with a conveyor belt 11.
  • the air 5 escaping from the working chamber 4 (which has a temperature in the range of approximately 500 ° C) is directed to a heat exchanger 6, in which the escaping air 5 sucked in air is preheated and this (along the path shown schematically with dashed lines). ) to the blower 10 in order to atomize liquid slag 1.
  • the air 5 escaping from the working chamber may be directed directly (without a heat exchanger) to the blower 10 and used for atomizing the liquid slag 1.
  • the air is then conducted in a closed circuit (recirculating) and used in its heated state to atomize the liquid slag 1.
  • a consumer 7 can be seen in the form of a steam generator 7 ', in which water is evaporated by using the energy obtained.
  • the steam is fed to a steam turbine generator system 8, in which electrical energy can be obtained in a manner known per se.
  • a consumer 7 is shown in the form of a heater 7".
  • the energy from the escaping air 5 is used for heating purposes.
  • the escaping air 5, which was passed through the heat exchanger 6, can in turn be directed to the exit point to be used as air 2, with which the liquid slag 1 is atomized. If recirculating air is used, it should have a temperature of not less than 120 ° C when it reaches the fan 10.
  • a further air stream 9 is passed through the bottom area, which heats up as it passes through the slag particles 3 and is fed to a heat exchanger 6 (as shown, this can be the same heat exchanger that was mentioned above, but also a separate one ).
  • the heat from the heated air stream 9 can be used in the manner described to make one or more consumers 7 available to be provided.
  • the aim is to remove as much heat from the slag particles through the further air flow 9 that the slag particles only have a temperature of approximately 80 ° C.
  • the extraction of heat from the slag particles does not necessarily have to take place directly in the bottom area of the working chamber 4. It is also possible to choose a downstream location for this, for example the area of the conveyor belt 11.
  • FIG 3 the working chamber 4 is shown again in more detail, with flight parabolas 18 indicating how the granulated slag particles 3 move from the (left) end region of the working chamber 4 as a result of being blown with air and then collect in the bottom region of the working chamber 4.
  • Defective products 19 usually fall down directly in the area of the air input and collect in a place from which they can be disposed of (in particular in the form of a settling hatch under the slag channel).
  • a receiving or removal element 16 for said defective products 19 is arranged here.
  • the properly granulated slag particles 3 collect in other places on the floor and are removed from the working chamber 4 by receiving or removal elements 17.
  • the bottom of the working chamber can be designed either as a simple sheet or as a perforated sheet in order to permeate the granules produced with air, which makes it possible, on the one hand, to further cool the granules and, on the other hand, to possibly extract further energy from the granules , which is then used for other purposes (see above).
  • the perforated plate is a 23 in. air plate Figure 4 designated.
  • the working chamber 4 is divided into a first section 12 and a second section 13.
  • the two sections are separated from one another by a baffle plate 14, which is arranged in the ceiling area of the working chamber 4.
  • the first section 12 lies in the area of the point at which the air and the liquid slag 1 are entered into the working chamber 4; the extent of the first section 12 is preferably between 15% and 35% of the total extent of the working chamber 4, with extension here being the width of the working chamber 4 according to the view Figure 4 is to be understood.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Furnace Details (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Manufacture Of Iron (AREA)
  • Glanulating (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (12)

  1. Procédé de granulation d'un laitier métallurgique, dans lequel le laitier liquide (1) est pulvérisé par soufflage d'air (2) et les particules de laitier (3) ainsi granulées sont recueillies, la pulvérisation s'effectuant en soufflant sur le laitier liquide (1) avec un jet d'air réchauffé (2) sans addition d'eau et en l'amenant à une chambre de travail (4), dans lequel la pulvérisation s'effectue en soufflant sur le laitier liquide (1) avec un jet d'air (2) chauffé, sans addition d'eau et en l'amenant à une chambre de travail (4), dans lequel les particules de laitier granulées (3) sont collectées dans la zone du fond de la chambre de travail (4), l'air (5) s'échappant de la chambre de travail (4) étant soit acheminé vers un échangeur de chaleur (6) qui préchauffe le jet d'air avec lequel le laitier liquide (1) est soufflé, soit envoyé directement dans le circuit pour pulvériser le laitier liquide (1), et dans lequel une seule chambre de travail (4) est utilisée pour le procédé, dans lequel l'amenée du laitier liquide (1) et son soufflage avec de l'air (2) s'effectuent dans une première section (12) de la chambre de travail (4), et les particules de laitier granulées (3) sont collectées dans une seconde section (13) de la chambre de travail (4), qui est espacée de la première section (12), dans lequel l'air (5) s'échappant de la chambre de travail (4) est évacué hors de la chambre de travail (4) dans la zone de la première section (12) et dans lequel la première section (12) et la seconde section (13) de la chambre de travail (4) sont séparées l'une de l'autre par un déflecteur (14) disposé dans la zone du plafond de la chambre de travail (4),
    caractérisé en ce
    qu'une partie de l'énergie contenue dans l'air (5) qui s'échappe est utilisée pour alimenter un consommateur (7), le consommateur (7) étant un générateur de vapeur.
  2. Procédé selon la revendication 1, caractérisé en ce que le laitier est maintenu exempt d'addition d'eau depuis son alimentation jusqu'à son dépôt dans la zone inférieure de la chambre de travail (4).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'air (2) avec lequel le laitier liquide (1) est soufflé, est préchauffé à au moins 60 °C, de préférence à au moins 80 °C, de manière particulièrement préférée à au moins 100°C et de préférence à au moins 120°C.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'air (2), après avoir été utilisé pour pulvériser le laitier liquide, a une température d'au moins 250°C, de préférence d'au moins 400°C.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le générateur de vapeur est en communication avec un système générateur de turbine à vapeur (8) pour produire de l'énergie électrique.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que les particules de laitier granulées (3) sont soufflées avec un autre flux d'air (9) pour chauffer l'air, l'air chauffé étant acheminé vers un échangeur de chaleur (6).
  7. Procédé selon la revendication 6, caractérisé en ce que la chaleur obtenue dans l'échangeur de chaleur (6) est utilisée pour alimenter un consommateur (7', 7").
  8. Procédé selon la revendication 7, caractérisé en ce que le consommateur (7') est un générateur de vapeur, qui est de préférence relié à un système de générateur à turbine à vapeur (8) pour la production d'énergie électrique, ou en ce que le consommateur (7") est un chauffage avec lequel des installations ou des bâtiments sont chauffés.
  9. Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que le laitier métallurgique est un laitier non ferreux.
  10. Procédé selon l'une quelconque des revendications 1 à 9, caractérisé en ce que le point d'évacuation (15) de l'air (5) qui s'échappe est situé verticalement au-dessus du point d'amenée du laitier liquide (1) et de son soufflage avec de l'air (2).
  11. Procédé selon l'une quelconque des revendications 1 à 10, caractérisé en ce que l'air (5), après s'être échappé de la chambre de travail (4), est d'abord dirigé verticalement vers le haut, puis dévié de 180°, puis dirigé verticalement vers le bas et ensuite à nouveau amené à la chambre de travail par l'intermédiaire de la soufflerie (10).
  12. Procédé selon l'une quelconque des revendications 1 à 11, caractérisé en ce qu'un élément de réception ou d'évacuation (16) pour les produits défectueux est disposé dans la première section (12) de la chambre de travail (4) et au moins un élément de réception ou d'évacuation (17) pour les particules de laitier granulées (3) est disposé dans la seconde section (13) de la chambre de travail (4).
EP21703626.8A 2020-02-03 2021-01-28 Procédé de granulation d'un laitier métallurgique Active EP4100550B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102020201290 2020-02-03
DE102020209057.2A DE102020209057A1 (de) 2020-02-03 2020-07-20 Verfahren zur Granulierung einer metallurgischen Schlacke
PCT/EP2021/051984 WO2021156136A1 (fr) 2020-02-03 2021-01-28 Procédé de granulation d'un laitier métallurgique

Publications (2)

Publication Number Publication Date
EP4100550A1 EP4100550A1 (fr) 2022-12-14
EP4100550B1 true EP4100550B1 (fr) 2024-03-13

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EP21703626.8A Active EP4100550B1 (fr) 2020-02-03 2021-01-28 Procédé de granulation d'un laitier métallurgique

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Country Link
US (1) US20230392230A1 (fr)
EP (1) EP4100550B1 (fr)
CN (1) CN115052998A (fr)
CL (1) CL2022002054A1 (fr)
DE (1) DE102020209057A1 (fr)
PL (1) PL4100550T3 (fr)
WO (1) WO2021156136A1 (fr)

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GB517774A (en) * 1939-05-10 1940-02-08 Roy Macgregor Drummond Apparatus for separating dust or other solids from air or other gases
AT238115B (de) * 1962-11-28 1965-01-25 Wibau Gmbh Vorrichtung zur Herstellung eines korngerechten Füllers als Anteil der Feststoffkomponenten bei der Aufbereitung von bituminös gebundenem Mischgut, insbesondere für Zwecke des Straßenbaues
US3469961A (en) 1966-08-25 1969-09-30 United States Steel Corp Method and apparatus for making slag pellets
JPS5927732B2 (ja) 1976-08-05 1984-07-07 大平洋金属株式会社 溶融スラグからの熱回収方法
JPS54159302A (en) 1978-06-07 1979-12-17 Mitsubishi Heavy Ind Ltd Recovering apparatus for heat from molten slag
JPH11181508A (ja) 1997-12-22 1999-07-06 Nippon Steel Corp 溶融高炉スラグの熱回収設備
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DE102009042874A1 (de) 2009-09-24 2011-04-07 Siemens Aktiengesellschaft Verfahren und Vorrichtung zur Nutzung der bei der Granulation einer flüssigen Schlacke freigesetzten Abwärme
WO2011160551A1 (fr) 2010-06-24 2011-12-29 北京神风创新热能技术有限公司 Appareil et procédé pour traiter par voie sèche un laitier métallurgique en fusion
LU91730B1 (en) * 2010-09-13 2012-03-14 Wurth Paul Sa Dry granulation of metallurgical slag
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Publication number Publication date
EP4100550A1 (fr) 2022-12-14
WO2021156136A1 (fr) 2021-08-12
CN115052998A (zh) 2022-09-13
PL4100550T3 (pl) 2024-06-03
DE102020209057A1 (de) 2021-08-05
CL2022002054A1 (es) 2023-09-15
US20230392230A1 (en) 2023-12-07

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