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EP1183395A1 - Procede de fragmentation et de granulation de scories, et dispositif pour la mise en oeuvre de ce procede - Google Patents

Procede de fragmentation et de granulation de scories, et dispositif pour la mise en oeuvre de ce procede

Info

Publication number
EP1183395A1
EP1183395A1 EP00924965A EP00924965A EP1183395A1 EP 1183395 A1 EP1183395 A1 EP 1183395A1 EP 00924965 A EP00924965 A EP 00924965A EP 00924965 A EP00924965 A EP 00924965A EP 1183395 A1 EP1183395 A1 EP 1183395A1
Authority
EP
European Patent Office
Prior art keywords
slag
foam
foam slag
tundish
pressure
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.)
Withdrawn
Application number
EP00924965A
Other languages
German (de)
English (en)
Inventor
Alfred Edlinger
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.)
Holcim Ltd
Original Assignee
Holcim Ltd
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 Holcim Ltd filed Critical Holcim Ltd
Publication of EP1183395A1 publication Critical patent/EP1183395A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • 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
    • C21B2400/05—Apparatus features
    • C21B2400/066—Receptacle features where the slag is treated
    • C21B2400/072—Tanks to collect the slag, e.g. water tank
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

Definitions

  • the invention relates to a method for comminuting and granulating slag, in which the molten slag is ejected into a pelletizing chamber with a propellant jet, and to an apparatus for carrying out this method.
  • liquid slag For crushing and granulating slag, it has become known to introduce liquid slag into a slag tundish and to discharge it into a granulation room by means of a propulsion jet.
  • the liquid slag was mostly discharged into the pelletizing room with steam or high-pressure water and atomized as it emerged into the pelletizing room, with rapid cooling in the pelletizing room being carried out, for example, by exposure to high-pressure water or by introducing hydrocarbons.
  • the invention now aims to provide a process of the type mentioned at the outset with which the composition of the slag and in particular the slag basicity can be varied within wide limits without losing the advantages of rapid comminution and rapid granulation of the slags and at the same time the possibility is created to ensure the relatively high temperature required for the rheology of the escaping slag in a particularly economical and simple manner without this leading to increased wear of refractory materials in the slag tundish. Furthermore, the invention aims to carry out the comminution and granulation with small-scale devices in such a way that subsequent grinding becomes unnecessary, so that a sufficiently fine particle size distribution of the solidified particles can be achieved immediately.
  • the process according to the invention essentially consists in that gases, in particular air or oxygen, are introduced into the molten slag to form a foam slag, and that the foam slag temperature is brought about by fuels introduced into the foam slag, such as coal, to temperatures of above 1350 ° C. , in particular 1420 ° to 1680 ° C and that the foam slag is ejected into a pelletizing room. Because a foam slag is now deliberately formed, the specific weight of the slag is first reduced significantly and in particular reduced to approximately 1/10 of the original specific weight of the compact slag melt.
  • the required temperature can be maintained in such foam slags by introducing solid fuels into the foam slag, which burn together with the injected oxygen inside the foam slag to form the foam slag and at the same time ensure the high melting temperatures in the manner.
  • the desired slag composition can now be set in a particularly simple manner, and solid additives such as CaO, Al2O3 and SiO2 can be added in the foam slag to set the slag basicity to a value of preferably 0.8 to 1.3 become. It is thus possible to build up the desired slag chemistry at the same time as the temperature of the molten bath in the foam slag, and to make matters worse, inexpensive fuels, such as cheap coal, can be used.
  • a possibly increased sulfur value of such cheap coal is immediately and immediately bound in the slag, the foam slag being a kind of flameless burner with which the exhaust gas temperatures can also be set in the desired manner. Since the resulting exhaust gas in the foam slag is already completely dedusted and any dust is slagged in situ and fuel sulfur is also incorporated into the slag due to the basicity of the slag, a high-purity exhaust gas is produced immediately, which can be directed, for example, to gas turbine showers . The fact that such a foam slag with the desired composition and the desired temperature is now ejected into a pelletizing chamber means that much easier and finer microgranulation can be achieved compared to compact slag melts.
  • the slag is already pre-comminuted in the foam slag melt, so that much finer particles are formed during a subsequent rapid cooling.
  • cooling can take place in any conventional manner, the foam slag being able to be passed directly into a conventional water bath, onto a plate cooling belt or via a centrifugal wheel.
  • the procedure according to the invention is preferably such that the foam slag is expelled with steam and high pressure water is applied in countercurrent.
  • steam with temperatures between 200 ° and 1200 ° C and a pressure between 5 and 15 bar is advantageously used to eject the foam slag, whereby high pressure water with a pressure between 50 and 300 bar is advantageously directed against the foam slag steam jet.
  • the high-pressure water jet enters the grinding or evaporation chamber with high kinetic energy as a counter jet to the steam jet.
  • the water jet evaporates due to the enthalpy flow of the slag droplets and the high-temperature steam.
  • the high kinetic energy of the high-pressure water is transferred to the evaporated high-pressure water, so that a rapidly directed steam volume is created which is directed at a high axially oriented speed towards the particle-laden high-temperature steam jet.
  • These two energetic potential fields mutually penetrate each other, so that the dissipated energy leads directly to particle size reduction, whereby the desired speed vector of the high pressure water, the high pressure water pressure, the free jet length and the distance to the high temperature steam inlet are available for further setting the desired size reduction.
  • the comminution efficiency can also be optimized by appropriate selection of the distances. so that a high grinding efficiency can also be set, for example, by appropriate adjustment of the high pressure water pressure.
  • the formation of the foam slag in the slag tundish allows not only the setting of the desired slag composition but also the formation of a correspondingly high and high-purity hot gas volume, which can be used energetically, for example, in a gas turbine, without the need for separate exhaust gas purification systems.
  • the slag basicity can be adjusted to a value of 0.8 to 1.3 in the foam slag in a simple manner by adding CaO, Al2O3 and / or SiO2.
  • foam slags have increased stability under superatmospheric pressure. It is therefore advantageous in the process according to the invention that the foam slag is kept under a pressure between 3 and 7 bar. With such a design, a pressure gradient is simultaneously formed at the outlet of the foam slag tundish, so that the hot foam slag emerges with high kinetic and thermal energy.
  • the hot exhaust gas has essentially the same temperature as the foam slag and is practically dust and sulfur-free and is therefore preferably suitable, for example, as a propellant gas for a gas turbine, with part of the mechanical energy obtained being used for air compressors for the bottom gas to be introduced to form the foam slag can.
  • the foam slag generator in the slag tundish presents itself as a flameless combustion chamber of a gas turbine, with which relatively coarse alternative fuels can be used directly and can be used economically.
  • the device according to the invention for carrying out this method is essentially characterized by a tundish in which a gas lance and / or in the bottom of which nozzles are arranged, that a foam slag overflow and an outlet opening for slag are provided so that the tundish carries a pressure-resistant lid, to which a lock for the entry of solids and coal is connected above the slag bath and that a lance for the entry of a carrier gas for ejecting the foam slag opens into the slag outlet opening.
  • the comminution takes place in a downstream grinding or evaporation chamber, for which the training is advantageously carried out in such a way that a grinding and evaporation chamber is connected to the slag outlet opening, that a pressure water line opens at the side of the chamber opposite the slag outlet and that a classifier for discharging the comminuted and granulated material is connected to the grinding and evaporation chamber.
  • a grinding and evaporation chamber it is also possible to work with reducing liquids or gases in addition to or as a replacement for the high-pressure water, with which residual iron oxide in the slag is reduced and, at the same time, rapid cooling is achieved due to the decomposition energy or cracking energy of hydrocarbons.
  • the fine iron formed in this way can be separated separately, for example by magnetic separators.
  • a major advantage of the formation of a foam slag is in addition to the fact that relatively high temperatures can be produced in a simple and controlled manner inside the foam slag, and also that any metallic slag iron is safely burned, so that slag granulation explosion risks are basically eliminated. Due to the high specific foam slag volumes, much larger slag outlet openings can be provided in the slag tundish, which increases the risk of clogging or overgrowth can be decisively minimized by possibly entrained solid particles, such as a refractory eruption. Compared to known devices, in which compact slags are ejected into a grinding or evaporation room, it is possible to build with comparatively large clear diameters, which are increased by a factor of 10 to 100 compared to known devices.
  • an exhaust pipe is connected to the tundish, which is led via a gas turbine and / or heat exchanger, which further improves the energy use and results in an economical procedure.
  • FIG. 1 shows a schematic cross section through a slag tundish for carrying out the method according to the invention
  • FIG. 2 shows a schematic arrangement of a grinding or evaporation chamber following such a foam slag generator.
  • Fig. 1 denotes a slag tundish, to the bottom of which porous floor stones 2 are connected. Air and / or oxygen is introduced via a line 3 into a melt 4 via the porous floor stones 2, a foam slag subsequently being formed in the interior of the melt.
  • the foam slag reaches a slag outlet opening 6 via a foam slag weir 5. Coaxial with the slag outlet opening 6 there is the mouth of a lance 7, through which, for example, high pressure steam can be injected and the foam slag can be quickly dispersed and comminuted after the outlet.
  • the slag tundish is closed and a cover 8 is provided.
  • Solids and especially CaO, Al2O3 and SiO2 to adjust the slag basicity a cellular wheel sluice 9 can be introduced directly into the foam slag bath, and due to the high turbulence, thorough mixing and homogeneous distribution are ensured at the same time.
  • Solid fuels, such as cheap coal, can also be introduced via the same cellular wheel lock 9 in order to ensure the desired foam slag temperature.
  • the foam slag burner output can be varied to a large extent.
  • a corresponding mode of operation can be selected as a flameless burner, from which the slag is discharged in each case after the desired composition has been reached and / or further slag can be introduced continuously to form the desired foam slag.
  • FIG. 2 now shows an advantageous comminution device which is connected downstream of a slag generator or slag tundish, as shown in FIG. 1.
  • the foam slag supply is indicated schematically by the chamber 11, into which a high-temperature steam lance 12 opens.
  • the foam slag 13 enters a grinding or evaporation chamber via the opening 14, a high-pressure water jet 15 being directed toward the emerging jet via a high-pressure water lance 16.
  • the high pressure water lance 16 can be slidably mounted in the direction of the double arrow 17 so that the desired parameters and in particular the spreading angle ⁇ can be set, which has a significant influence on the degree of grinding and the degree of efficiency.
  • High pressure water is used with a pre-pressure of around 50 to 300 bar.
  • High temperature steam can be used in the temperature range between 200 ° and 1200 ° C and in a pressure range of 5 to 15 bar.
  • the spreading angle ⁇ shown in FIG. 2 can also be interpreted as an evaporation gradient, the angle ⁇ increasing correspondingly at a lower pressure of the high-pressure water.
  • the larger this angle ⁇ the smaller the grinding efficiency and the coarser the ground material.
  • simple adjustments make it possible to set both the grinding efficiency and the degree of comminution in accordance with the desired parameters, the fine ground material subsequently being able to be drawn off via a classifier 18 and the line 19.
  • air / oxygen can optionally be added together in the foam slag via a blowing lance 20 be blown with carbon to achieve the formation of the foam slag and the desired foam slag temperature. In these cases it is even possible to dispense with porous sink stones 2 in the floor.

Landscapes

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

Abstract

L'invention concerne un procédé de fragmentation et de granulation de scories, selon lequel les scories en fusion sont introduites dans une chambre de granulation par un jet propulseur. Dans les scories en fusion est introduit du gaz, en particulier de l'air ou de l'oxygène, pour former de la mousse de scories, la température de la mousse de scories est portée, par des combustibles introduits dans la mousse de scories, tels que du charbon, à une température supérieure à 1350 °C, en particulier à une température pouvant aller de 1420 à 1680 °C, et la mousse de scories est propulsée dans une chambre de granulation. Le dispositif comporte un avant-creuset (1), dans lequel débouche une lance à gaz (20) et/ou dans le fond duquel sont disposées des buses (2), ainsi qu'un trop-plein pour mousse de scories (5) et une ouverture d'écoulement (6) pour scories. L'avant creuset (1) est pourvu d'un couvercle (8) résistant à la pression auquel est raccordé un sas (9) permettant l'introduction de solides et de charbon au-dessus du bain de scories, et dans l'ouverture de sortie de scories (6) débouche une lance (7) servant à l'introduction d'un gaz porteur pour l'expulsion de la mousse de scories (4).
EP00924965A 1999-05-05 2000-05-04 Procede de fragmentation et de granulation de scories, et dispositif pour la mise en oeuvre de ce procede Withdrawn EP1183395A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0080299A AT407153B (de) 1999-05-05 1999-05-05 Verfahren zum zerkleinern und granulieren von schlacken sowie vorrichtung zur durchführung dieses verfahrens
AT80299 1999-05-05
PCT/AT2000/000118 WO2000068439A1 (fr) 1999-05-05 2000-05-04 Procede de fragmentation et de granulation de scories, et dispositif pour la mise en oeuvre de ce procede

Publications (1)

Publication Number Publication Date
EP1183395A1 true EP1183395A1 (fr) 2002-03-06

Family

ID=3500051

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00924965A Withdrawn EP1183395A1 (fr) 1999-05-05 2000-05-04 Procede de fragmentation et de granulation de scories, et dispositif pour la mise en oeuvre de ce procede

Country Status (4)

Country Link
EP (1) EP1183395A1 (fr)
AT (1) AT407153B (fr)
AU (1) AU4384800A (fr)
WO (1) WO2000068439A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT408956B (de) * 2000-05-11 2002-04-25 Tribovent Verfahrensentwicklg Einrichtung zur erzeugung eines heissen treibgasstromes
LU91424B1 (en) * 2008-04-01 2009-10-02 Wurth Paul Sa Granulation plant
CN106755660B (zh) * 2016-12-13 2019-01-15 钢研晟华工程技术有限公司 一种基于钢厂固废熔融还原的泡沫渣稀相干法粒化方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB563655A (en) * 1943-01-18 1944-08-24 Marcel Gallai Hatchard Improved method for the production of porous slags or other smelts
GB1285936A (en) * 1969-12-09 1972-08-16 Nippon Kokan Kk Slag granulating apparatus
DD156271A1 (de) * 1981-02-12 1982-08-11 Hellfried Mieck Anlage zur aufbereitung schmelzfluessiger materialien
AT401301B (de) * 1993-07-01 1996-08-26 Holderbank Financ Glarus Reaktor sowie verfahren zum schmelzen von verbrennungsrückständen
EP0655508B1 (fr) * 1993-11-30 1998-08-19 ACCIAI SPECIALI TERNI S.p.a. Procédé pour utilisation de laitier moussé dans la fabrication d'acier inoxydable par la voie du four à arc électrique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0068439A1 *

Also Published As

Publication number Publication date
ATA80299A (de) 2000-05-15
AU4384800A (en) 2000-11-21
AT407153B (de) 2001-01-25
WO2000068439A1 (fr) 2000-11-16

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