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WO2001047623A1 - Procede et dispositif permettant de granuler et de concasser de la scorie en fusion - Google Patents

Procede et dispositif permettant de granuler et de concasser de la scorie en fusion Download PDF

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Publication number
WO2001047623A1
WO2001047623A1 PCT/AT2000/000335 AT0000335W WO0147623A1 WO 2001047623 A1 WO2001047623 A1 WO 2001047623A1 AT 0000335 W AT0000335 W AT 0000335W WO 0147623 A1 WO0147623 A1 WO 0147623A1
Authority
WO
WIPO (PCT)
Prior art keywords
slag
tundish
cooling
expansion chamber
propellant
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/AT2000/000335
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
Holderbank Financiere Glarus AG
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, Holderbank Financiere Glarus AG filed Critical Holcim Ltd
Priority to AU21255/01A priority Critical patent/AU2125501A/en
Priority to EP00984603A priority patent/EP1156872A1/fr
Publication of WO2001047623A1 publication Critical patent/WO2001047623A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
    • B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B5/00—Treatment of  metallurgical  slag ; Artificial stone from molten  metallurgical  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
    • C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the invention relates to a method for granulating and comminuting slag melts for the production of hydraulically active binders or binder additives, in which the slags are ejected with a propellant jet into a cooling or expansion chamber and an apparatus for carrying out this method.
  • the method according to the invention is now aimed at significantly reducing the dimensions of the required cooling and expansion chamber and with particularly small - 2 -
  • the method according to the invention essentially consists in that the ejection is carried out against the direction of gravity. Because the droplet droplets are ejected in the opposite direction to the direction of gravity, the discharged droplet droplets come into intensive collision in the state of solidification with particles which in turn sink due to the force of gravity, so that in addition to the comminution effect, such as that caused by the atomization and expulsion of the slags a propulsive jet and the subsequent spraying or blowing up of cooling gases is achieved, there is an additional comminution effect, which results from the counter-flowing fine particles due to a direct collision with them.
  • the process according to the invention is advantageously carried out in such a way that the powder-steam mixture drawn off from the cooling and expansion chamber is subjected to a solid separation and that the gas stream containing fine dust and steam is passed from the solid separation via a condenser, which fresh water to supplement the water or Steam losses are added, whereupon, after a clarifier, the clarified water is used to cool the walls of the cooling or expansion chamber.
  • a condenser which fresh water to supplement the water or Steam losses are added, whereupon, after a clarifier, the clarified water is used to cool the walls of the cooling or expansion chamber.
  • Another essential factor for the economical implementation of the process is the water requirement and the accumulation of large amounts of wastewater to be cleaned.
  • Powder-vapor mixture is first subjected to a solid separation, for example dust separation in the form of a filter or a cyclone
  • a gas stream containing only fine dust and steam can be removed from the solid separation, which can subsequently be passed through a condenser. Since steam or water losses cannot naturally be ruled out in such processes, fresh water must be added, fresh water also usually having to be subjected to water treatment and, in particular, softening in the process according to the invention, in order to ensure that steam nozzles or steam lines are not in the course of the process of the company.
  • the fresh water added is thus effectively decalcified and, in the process according to the invention, is recirculated into the process together with the condensed and purified steam after the clarifier and used, for example, to cool the walls of the cooling or expansion chamber.
  • the procedure can be such that the clarified water after precipitation and separation of CaCO3 in the clarifier is passed through a further water treatment, such as an ion exchanger or softener, which can also be used, for example, to convert sulfate hardness and other troublesome salts into solution-stable alkali salts.
  • the water used to cool the walls of the cooling and expansion chamber can subsequently in the cooling or expansion Chamber for quenching the liquid slag melts are used in the cooling and expansion chamber, for which it is advantageously carried out in such a way that the water used for cooling the walls of the cooling or expansion chamber is passed over a steam superheater and used as a propellant.
  • the steam extracted from the dust separator generally contains a maximum of 60 mg fine dust / no steam. Since the oxidic slag melts, which are atomized to produce hydraulically active binders or binder additives, have a high calcium oxide content, such an amount of very fine dust can raise the pH value of the condensate to 11 with the formation of CaOH2. These preconditions allow calcium carbonate to be precipitated quickly and safely from calcium hydrogen carbonate, so that practically hardness-free feed water remains after the addition of fresh water. In the event that H2S or SO2 development is observed in the system, the high calcium oxide content of the fine dust can also be used to desulfurize.
  • the procedure is therefore preferably such that a barrier medium, such as e.g. Steam, air, hydrocarbon or coal dust-vapor mixtures, is introduced to reduce recirculation flows.
  • a barrier medium such as e.g. Steam, air, hydrocarbon or coal dust-vapor mixtures.
  • the barrier medium to be introduced can also be throttled so that the drive jet oscillates. This leads to an optimization of the droplet tearing behavior and thus to a better atomization.
  • the device according to the invention for carrying out the method has a slag tundish and a feed line for propellant gas connected to the slag tundish. Furthermore, a cooling and expansion chamber is provided, which is arranged below the slag tundish in the known devices.
  • the device according to the invention is essentially characterized in that the feed line opens at the bottom of the slag tundish and that the tundish is pivotally mounted transversely to the axis of the driving jet and that the cooling or expansion chamber is arranged above the melt level in the tundish.
  • the swiveling arrangement of the slag tundish makes it possible to pivot the operation without the risk of liquid slag escaping in the direction of the jet nozzles, with an annular weir surrounding the feed line for the jet jet - -
  • the pivotability of the slag tundish enables the height of the slag level to be dusted by the propellant jet to be adjusted by means of a corresponding pivot position, so that the desired atomization effect and the impact on the quench can be set within wide limits.
  • the inlet opening provided for the propellant gas in the bottom of the slag tundish is designed as a Laval nozzle, a guide body immersed in the slag being arranged in the region of the nozzle opening, which is preferably arranged to be adjustable in height.
  • the guide body can also be used to close the inlet openings provided in the bottom of the slag tundish, with the height adjustment of the guide body and the pivotability of the tundish making it possible to set the atomization parameters precisely.
  • cooling gas for example wet water vapor or also hydrocarbons
  • the design preferably being such that at least one ring-shaped is located between the melt level and the cooling or expansion chamber Atomizer nozzle is arranged, the jet axes of which intersect the axis of the driving jet.
  • the procedure according to the invention and the operation of the device according to the invention are such that the temperature of the propellant gas is set higher than the temperature of the atomizer nozzle gas, the pressure in the feed line to the atomizer nozzle preferably being greater than in the feed line to Propellant gas nozzle is set and that the axes of the atomizing nozzles are directed upwards in the direction of the axis of the propellant jet.
  • the pressure range used in the process according to the invention is generally between 2 and 16 bar, with temperatures between 600 ° and 1200 ° C. preferably being used.
  • a total of about 150 to 1000 kg of hot gas are used per t of slag, the temperature of the slag melt being between 1430 ° and 1560 ° C.
  • the slag Due to the use of a propellant gas jet, the slag is expelled into the cooling or expansion chamber as a jacket of the propellant gas jet, so that only the thin wall of this jet has to be solidified by the action of the cooling gases, thereby ensuring rapid glassy solidification and the hydraulic properties of the product are not impaired.
  • the design is advantageously made such that a wall which is immersed in the melt level from above as a slag surge breaker is installed in the slag tundish when the tun dish is pivoted.
  • FIG. 1 shows an overall view of the device according to the invention
  • FIG. 2 shows a detailed illustration of the tundish with the driving jet
  • FIG. 3 shows a modified embodiment with guide bodies.
  • a slag tundish 1 can be seen, which is pivotally mounted about an axis 2 on a bearing block 3.
  • the slag tundish 1 can thus be pivoted about the pivot axis 2.
  • the slag tundish has an annular weir 4 in its interior, which concentrically surrounds a feed line 5 for propellant gas.
  • the slag is introduced into the tundish from a slag reservoir 29.
  • a cooling or expansion chamber 8 Above the slag tundish 1 there is a cooling or expansion chamber 8, the walls of which are cooled by radiant heat exchangers 9.
  • An annular nozzle 10 is connected to this cooling and expansion chamber, through which quench gases can be injected in order to permit rapid cooling of the particles expelled upward with the propellant gas from the feed line 5 into the cooling and expansion chamber. The particles are thus thrown upwards and collide with particles, which sink down again due to gravity in the cooling or expansion chamber.
  • Fresh water is supplied via a line 11 for cooling the walls or the radiant heat exchanger 9. After this fresh water has been heated, this fresh water passes via line 12 into a steam drum 13, from which steam is drawn off and passed over a superheater 14. The superheated steam can subsequently be used as a propellant gas stream via the feed line 5. From the steam drum 13, hot water is drawn off via line 15, which via the ring nozzles 10 in the cooling or. Expansion space is pushed in, the pressure here being generally chosen so that it is above the pressure of the propellant jet. Instead of hot water, hot steam can also be injected here, since the particles are rapidly comminuted, so that a sufficiently high temperature gradient is available for rapid glass-like cooling of the particles.
  • the circulation of water or steam can also be carried out as shown in dashed lines in Fig.l.
  • the feed water is fed to the steam drum 13 via the line 11, hot water is removed from the steam drum 13 and fed to the radiant heat exchanger 9.
  • a Pulver-Dampfge iseh is withdrawn via a line 16, which is fed to a dust separator 17.
  • the powder removed from the dust separator 17 represents a high-quality hydraulically active binder product which can be used directly as a cement substitute or as a binder additive.
  • Fine dust and steam are drawn off from the dust separator via line 18 and fed to a condenser 19.
  • water or steam loss can be supplemented by supplying fresh water via line 20, the mixture of condensed steam and added fresh water reaching a clarifier 22 via line 21.
  • a clarifier 22 At the latest in the clarifier, due to the fine dust content with high lime content contained in the steam, a rapid reaction with precipitation of calcium carbonate takes place, so that largely softened water can be drawn off via line 23 and can be fed to a further water treatment, such as an ion exchanger 24.
  • a feed water pump 25 Via a feed water pump 25, the softened and purified water in turn passes into line 11, which leads to the radiant heat exchangers 9.
  • the process water used can thus be almost entirely recycled, which means that the total waste water pollution can be significantly reduced.
  • the fine dust content in the steam can be used for rapid softening of fresh water, the sodium ions remaining essentially after the ion exchanger 24 being incorporated into the slag particles in the cooling or expansion space 8.
  • Sludge is discharged from the clarifier via a line 26.
  • This essentially calcium carbonate-containing sludge can subsequently be injected into the quench or the cooling and expansion space, for example, via multi-component nozzles, and can be incorporated directly into the slag droplets to improve the cement technology properties, as a result of which no additional sludge is obtained here either.
  • FIG. 2 now shows a detailed view of the tundish with the propellant jet, a chamber 27 being visible through which a barrier medium is introduced into the cooling or expansion chamber in order to prevent recirculation flows through uncontrolled suction of ambient air.
  • the blocking medium can also be introduced via a throttle valve 28, as a result of which the drive jet is oscillated.
  • a slag tundish 1 can be seen, which is pivotably mounted on a bearing block 3 about an axis 2.
  • the supply line for propellant gas is denoted by 5 and opens into a plurality of inlet openings 30 provided in the bottom of the tundish.
  • the inlet openings 30 are designed as Laval nozzles, with guide bodies 31 being immersed in the slag in the region of the nozzle opening of the inlet openings 30.
  • the guide bodies 31 are arranged such that they can be adjusted in height in the direction of the double arrow 32, the guide bodies 31 also being able to serve as plugs for closing the inlet openings.
  • line 5 for example, propellant steam at a pressure of 3 to 25 bar and a temperature of 650 to 1350 ° C. can be supplied.
  • the method according to the invention results in an extremely low-wastewater method, the entire feed water treatment being able to be inexpensively processed within the method due to components contained in the fine dust.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Manufacture Of Iron (AREA)

Abstract

Procédé de granulation et de concassage de scorie en fusion pour la fabrication de liants ou additifs de liaison à action hydraulique, selon lequel la scorie est éjectée à l'aide d'un jet de propulsion dans une chambre de refroidissement ou d'expansion, l'éjection ayant lieu dans le sens inverse de la gravité. Le dispositif permettant de mettre en oeuvre ledit procédé possède un panier collecteur et une conduite d'alimentation en gaz de propulsion connectée au panier collecteur qui débouche à l'intérieur d'un déversoir annulaire situé dans le panier, ainsi qu'une chambre de refroidissement ou d'expansion. La conduite d'alimentation débouche dans la paroi de fond du panier collecteur, le panier collecteur est monté pivotant perpendiculairement à l'axe du jet de propulsion et la chambre de refroidissement ou d'expansion est placée au-dessus du niveau de la scorie contenue dans le panier collecteur.
PCT/AT2000/000335 1999-12-28 2000-12-11 Procede et dispositif permettant de granuler et de concasser de la scorie en fusion Ceased WO2001047623A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU21255/01A AU2125501A (en) 1999-12-28 2000-12-11 Device and method for granulating and comminuting slag melts
EP00984603A EP1156872A1 (fr) 1999-12-28 2000-12-11 Procede et dispositif permettant de granuler et de concasser de la scorie en fusion

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA2196/99 1999-12-28
AT0219699A AT408220B (de) 1999-12-28 1999-12-28 Verfahren und vorrichtung zum granulieren und zerkleinern von schlackenschmelzen

Publications (1)

Publication Number Publication Date
WO2001047623A1 true WO2001047623A1 (fr) 2001-07-05

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PCT/AT2000/000335 Ceased WO2001047623A1 (fr) 1999-12-28 2000-12-11 Procede et dispositif permettant de granuler et de concasser de la scorie en fusion

Country Status (4)

Country Link
EP (1) EP1156872A1 (fr)
AT (1) AT408220B (fr)
AU (1) AU2125501A (fr)
WO (1) WO2001047623A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1394275A1 (fr) * 2002-08-14 2004-03-03 Tribovent Verfahrensentwicklung GmbH Procédé pour l'élimination d'alcalins de matiére en fusion contenant des oxydes
CN106986562A (zh) * 2017-03-31 2017-07-28 四川省劲腾环保建材有限公司 膨化渣陶粒生产方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57110330A (en) * 1980-12-27 1982-07-09 Nippon Steel Corp Method for preparing particulate slug from molten steel slug and, at same time, recovering sensible heat
JPS60215704A (ja) * 1984-04-11 1985-10-29 Nippon Jiryoku Senko Kk 製鋼スラグの処理方法
WO1999022031A1 (fr) * 1997-10-29 1999-05-06 'holderbank' Financiere Glarus Ag Procede de granulation et de fragmentation d'un materiau en fusion, et dispositif pour la mise en oeuvre de ce procede
WO1999042623A1 (fr) * 1998-02-18 1999-08-26 'holderbank' Financiere Glarus Ag Procede pour granuler et broyer des scories liquides et dispositif permettant de mettre ledit procede en oeuvre
US5993510A (en) * 1996-09-17 1999-11-30 "Holderbank" Financiere Glarus Ag Process for working up combustion residues

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57110330A (en) * 1980-12-27 1982-07-09 Nippon Steel Corp Method for preparing particulate slug from molten steel slug and, at same time, recovering sensible heat
JPS60215704A (ja) * 1984-04-11 1985-10-29 Nippon Jiryoku Senko Kk 製鋼スラグの処理方法
US5993510A (en) * 1996-09-17 1999-11-30 "Holderbank" Financiere Glarus Ag Process for working up combustion residues
WO1999022031A1 (fr) * 1997-10-29 1999-05-06 'holderbank' Financiere Glarus Ag Procede de granulation et de fragmentation d'un materiau en fusion, et dispositif pour la mise en oeuvre de ce procede
WO1999042623A1 (fr) * 1998-02-18 1999-08-26 'holderbank' Financiere Glarus Ag Procede pour granuler et broyer des scories liquides et dispositif permettant de mettre ledit procede en oeuvre

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 202 (C - 129) 13 October 1982 (1982-10-13) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 078 (C - 335) 27 March 1986 (1986-03-27) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1394275A1 (fr) * 2002-08-14 2004-03-03 Tribovent Verfahrensentwicklung GmbH Procédé pour l'élimination d'alcalins de matiére en fusion contenant des oxydes
CN106986562A (zh) * 2017-03-31 2017-07-28 四川省劲腾环保建材有限公司 膨化渣陶粒生产方法

Also Published As

Publication number Publication date
AT408220B (de) 2001-09-25
EP1156872A1 (fr) 2001-11-28
AU2125501A (en) 2001-07-09
ATA219699A (de) 2001-02-15

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