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WO2003035914A1 - Procédé et dispositif pour refroidir des scories - Google Patents

Procédé et dispositif pour refroidir des scories Download PDF

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Publication number
WO2003035914A1
WO2003035914A1 PCT/DE2002/003788 DE0203788W WO03035914A1 WO 2003035914 A1 WO2003035914 A1 WO 2003035914A1 DE 0203788 W DE0203788 W DE 0203788W WO 03035914 A1 WO03035914 A1 WO 03035914A1
Authority
WO
WIPO (PCT)
Prior art keywords
slag
container
cooled
containers
collecting
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.)
Ceased
Application number
PCT/DE2002/003788
Other languages
German (de)
English (en)
Inventor
Egon Evertz
Rolf Seybold
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.)
Egon Evertz KG GmbH and Co
Original Assignee
Egon Evertz KG GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Egon Evertz KG GmbH and Co filed Critical Egon Evertz KG GmbH and Co
Publication of WO2003035914A1 publication Critical patent/WO2003035914A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • C21B2400/05—Apparatus features
    • C21B2400/06—Conveyors on which slag is cooled
    • 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
    • C21B2400/066—Receptacle features where the slag is treated
    • C21B2400/07—Receptacle features where the slag is treated open to atmosphere

Definitions

  • the invention relates to a method for cooling slags which arise during steel production and / or steel processing and which are discontinuously drawn off in batches and then cooled.
  • the invention further relates to a device for cooling slags with at least one collecting container.
  • slags accumulate on the bathroom mirror, which contain undesirable companions for the end products and are therefore removed from time to time as required.
  • the resulting slag quantities are collected in a collecting container which, according to the prior art, is emptied after being poured out.
  • the slags are poured into a bunker or on a heap and brought to cool and solidify by spraying with water.
  • the risk of explosion can be reduced by using large water flows, precautions must then be taken in order to discharge the large amounts of water again.
  • large, space-consuming decanting tanks or drainage drums can be used for this.
  • such measures including the associated costs, prove to be too expensive.
  • WO 99/42623 discloses a process for granulating and comminuting liquid slags, in particular blast furnace slags, with water, in which the slag is directed in a pressurized water jet.
  • gases in particular oxygen, air and / or oxygen-inert gas mixtures
  • the pressurized water jet gases, in particular oxygen, air and / or oxygen-inert gas mixtures, are to be dissolved in the slag prior to the discharge, iron portions of the slag being oxidized quantitatively, the slag being pressed out through a slag opening with the pressure of the pressurized water and as the jacket of the Pressurized water jet is ejected.
  • Pressurized water pressures between 35 bar and 160 bar must be used for this.
  • the expenditure on equipment is as high as it is costly, which is economically unacceptable for smaller quantities of slag.
  • a device for wet granulation of liquid slag which comprises a granulating basin with a spraying device for the granulating water, a decanting basin separated from the granulating basin, in which the slag settles as granulate, and a device for introducing the granulate water Contains mixture from the granulating basin into the decanting basin, wherein the device for introducing the granulate-water mixture from the granulating basin into the decanting basin comprises at least one elongated distribution channel which extends over the decanting basin. The underside of the distribution channel has flow agents distributed over its length over the granulate / water mixture.
  • a vertical, downwardly open inflow shaft is formed below the at least one distribution channel, into which the outflow means for the granulate / water mixture open.
  • a method for granulating and disintegrating slag is gen of flüssi ⁇ known in which liquid slags in an expansion chamber and a cooling zone is introduced, the liquid slag being sucked into an expansion chamber which is under negative pressure and being transported into the cooling zone with a propellant jet.
  • High-pressure water with a pressure of over 50 bar or superheated steam with temperatures of over 800 ° C is used as the driving jet.
  • the slag cooling should be advanced to such an extent that temperatures below the so-called auto-ignition temperature of the slag are reached, so that the slag can be safely introduced into further processing processes.
  • the batches of slag are poured into a mobile container with a large base area and a maximum filling height of 0.2 m, preferably ⁇ 0.1 m, the base surface of the mobile container having a greater thermal capacity than that of the slag to be accommodated.
  • the mobile container is then moved down, after which the slag cooled to a temperature below the slag ignition temperature, preferably ⁇ 300 ° C., is poured out for further processing by heat extraction, and the emptied container is finally ideally, preferably by means of water, to a temperature ⁇ 100 ° C. Cooled to room temperature and moved back to take up the liquid slag batch again.
  • the main idea of this process is based on the knowledge that there is a relatively long time between two slag There remains space in which the resulting slag can be removed in batches, ie in 6 to 8 courses, for example, before the next slag tapping takes place. This time, which in practice is around 30 minutes, can also be used to cool down the slag.
  • the slag is poured over a wide area and at a low height on the bottom of a movable container, the bottom plate of which has a high heat capacity which is dimensioned such that the heat which can be absorbed is greater than the heat capacity of the slag poured thereon.
  • the excess heat present in the slag due to the good conductivity of the base plate is eliminated in a short time due to the heat balance between the slag and the base plate into this over.
  • Iron contained in the slag is deposited on the base plate in thin layers due to the higher specific weight. The slag that tipped over after cooling is therefore easier to shred. This ensures that the significantly poorer thermal conductivity of slags does not significantly hinder the heat transfer to the base plate, the amount of slag released into the container should have a small height, preferably of a maximum of 10 cm.
  • the container base plate has a surface area of approximately 2 mx 2 m, a slag height of 0.1 m results in a fillable slag quantity of 2 t to 3 t weight.
  • the cooled down slag can then be tipped over safely, after which the emptied container is cooled, for example using water, and returned for refilling with slag.
  • a wagon that can be moved on wheels is preferably used as the container.
  • each container of this train takes up a batch of slag, the number of containers required being determined by the total amount of slag per tapping and the above defined maximum degree of filling of the containers.
  • the containers are successively filled with slag at a height of 10 cm, which can be done relatively quickly, for example in 5 to 8 minutes.
  • each of these coupled containers cools the slag by removing heat
  • the cooled-down slags can be successively tipped over for further processing and the container train can be cooled after casting and returned to the starting position, so that the first container can be refilled the next time a slag batch is produced.
  • the slag is poured into the mobile container or containers via a funnel with, viewed in a plan view, overlapping guide surfaces which are arranged at different heights.
  • the guide surfaces are preferably water-cooled, i.e. they have internal cooling channels fed with water.
  • the slag is already pre-cooled when it is conveyed into the movable container.
  • the funnel and / or the guide surface preferably consist of the same material as the bottom of the movable container, that is to say of steel, copper, a copper alloy.
  • the device according to the invention in which the collecting container is designed as a movable tilting container with a large base area and a maximum filling height of 0.2 m, preferably ⁇ 0.1 m, also has corresponding advantages as explained with reference to the method described above.
  • the heat capacity of the bottom of the collecting container is greater than the heat capacity of the slag to be taken up, which results from the container dimensions.
  • a device for cooling the collecting container or more collector see pre ⁇ .
  • several collecting containers are preferably coupled to one another and can be moved together as a train of several trucks.
  • the bottom surface of the collecting container is made of steel, cast iron, copper or a copper alloy.
  • the above-described funnel with baffles is arranged above the track.
  • FIG. 1 is a schematic view of a pouring device with a movable train from a total of 8 lorries
  • Fig. 2 is a schematic view of the process sequence in
  • 3 and 4 each show a top view and a side view of a lore with a filling funnel.
  • Each of these lorries has a floor 13 made of a thick plate with a high heat capacity and having the dimensions of approximately 2 mx 2 m.
  • the trough depth h (see FIG. 4) is 15 cm, so that with an intended filling height of 10 cm, the capacity of each lorry 1 to 8 is 0.4 m 3 .
  • the train formed from the lorries 1 to 8 can be moved along a rail track with the length L of, for example, 50 m.
  • the device 9 arranged for pouring off the slag has a funnel 10 with baffles 11, 12 which are arranged at different heights such that the baffles partially overlap when viewed in a plan view.
  • the funnel 10 is arranged in a support frame 15.
  • Fig. 1 and the uppermost schematic diagram in Fig. 2 represent the initial state in which the first wagon of a train is placed below the funnel.
  • the slag is now discharged via the funnel 10 into the interior of the lore in such a way that the filled slag has a height of approximately 10 cm in the first lore.
  • the floor plate 13 lying at room temperature absorbs the excess heat from the slag relatively quickly over the 2 mx 2 m floor area due to its high conductivity and its large heat capacity.
  • the slag train is moved forward by 2 m, so that the wagon 2 is guided below the funnel, after which it funnels in the same way as for wagon 1. wrote is filled.
  • This process is successively repeated by means of a corresponding lore feed, the lore 5 being filled, for example, in the second illustration in FIG. 2.
  • the lorries are moved successively into area 16 (see corresponding column in FIG. 2), where they are emptied by tilting.
  • the slag has a temperature which is below 300 ° C. due to appropriate heat removal.
  • the lorry pull position is shown, in which the lorries 3 and 4 are emptied, whereas the lorries 1 and 2 have already reached the region 17, in which they are preferably cooled by water.
  • the trolleys are successively moved on until the last two trolleys 7 and 8 have also reached the cooling zone according to the lower illustration in FIG. 2. After all the trucks have cooled, the entire train is moved back to the starting position according to FIG. 1.
  • the time available between two slag taps is about 20 to 30 minutes. During this time, all of the lorries can be successively filled, the slag cooled, the lorries emptied, and the lorries cooled again and returned to their original position.
  • the advantage of the process technology described and the device for carrying out the method is that the slag can be safely cooled down to temperatures at which self-ignition is eliminated with simple technical means without high labor and cost expenditure and without endangering the operating personnel.
  • the slag temperatures reached of less than 300 ° C allow the slag to be processed into granules more easily than the wet granulation processes according to the prior art mentioned at the outset.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant de refroidir des scories. Selon l'invention, les charges de scories sont versées dans un récipient mobile ayant un fond de grande surface et une hauteur de remplissage importante maximale de 0,2 m. La surface du fond dudit récipient mobile présente une capacité thermique supérieure à celle des scories à recevoir. Ledit récipient mobile est ensuite emporté, les scories refroidies sont déversées hors dudit récipient en vue d'un traitement subséquent et le récipient vidé est ensuite refroidi et est renvoyé pour recevoir de nouvelles charges de scories liquides.
PCT/DE2002/003788 2001-10-17 2002-10-08 Procédé et dispositif pour refroidir des scories Ceased WO2003035914A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10150668.6 2001-10-17
DE10150668A DE10150668B4 (de) 2001-10-17 2001-10-17 Verfahren und Vorrichtung zur Abkühlung von Schlacken

Publications (1)

Publication Number Publication Date
WO2003035914A1 true WO2003035914A1 (fr) 2003-05-01

Family

ID=7702450

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2002/003788 Ceased WO2003035914A1 (fr) 2001-10-17 2002-10-08 Procédé et dispositif pour refroidir des scories

Country Status (2)

Country Link
DE (1) DE10150668B4 (fr)
WO (1) WO2003035914A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1366398A (en) * 1918-01-10 1921-01-25 Lund Joel Process of and apparatus for making slag
FR1005803A (fr) * 1947-09-26 1952-04-16 Procédé pour la fabrication de pièces moulées à partir de laitiers
FR2472017A1 (fr) * 1979-12-19 1981-06-26 Nippon Kokan Kk Appareil de fabrication de laitier vitreux de haut fourneau
US6189818B1 (en) * 1999-07-14 2001-02-20 Bpi, Inc. Process for stabilizing and reusing ladle slag
EP1083236A1 (fr) * 1999-09-09 2001-03-14 Anton Dipl.-Ing. Hulek Procédé et installation pour le refroidissement à sec de scories métallurgiques avec récupération de chaleur

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1508039A1 (de) * 1951-01-28 1969-09-25 Knapsack Ag Verfahren und Vorrichtung zur Herstellung von Stueckschlacke
DE3626772A1 (de) * 1986-08-07 1988-02-11 Thyssen Stahl Ag Verfahren und vorrichtung zur herstellung von strassenbaustoffen und waermerueckgewinnung aus metallurgischen schlacken
JPH06240312A (ja) * 1993-02-17 1994-08-30 Nippon Steel Corp スラグの冷却破砕処理設備
JPH06240313A (ja) * 1993-02-17 1994-08-30 Nippon Steel Corp スラグの冷却破砕処理方法
JPH06256815A (ja) * 1993-03-04 1994-09-13 Nippon Steel Corp スラグの冷却破砕処理方法および事前処理装置
FR2800096B1 (fr) * 1999-10-26 2002-02-22 Manfred Reinartz Procede de traitement des scories

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1366398A (en) * 1918-01-10 1921-01-25 Lund Joel Process of and apparatus for making slag
FR1005803A (fr) * 1947-09-26 1952-04-16 Procédé pour la fabrication de pièces moulées à partir de laitiers
FR2472017A1 (fr) * 1979-12-19 1981-06-26 Nippon Kokan Kk Appareil de fabrication de laitier vitreux de haut fourneau
US6189818B1 (en) * 1999-07-14 2001-02-20 Bpi, Inc. Process for stabilizing and reusing ladle slag
EP1083236A1 (fr) * 1999-09-09 2001-03-14 Anton Dipl.-Ing. Hulek Procédé et installation pour le refroidissement à sec de scories métallurgiques avec récupération de chaleur

Also Published As

Publication number Publication date
DE10150668B4 (de) 2011-10-27
DE10150668A1 (de) 2003-04-30

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