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EP0963447A1 - Procede de granulation et de fragmentation d'un materiau en fusion, et dispositif pour la mise en oeuvre de ce procede - Google Patents

Procede de granulation et de fragmentation d'un materiau en fusion, et dispositif pour la mise en oeuvre de ce procede

Info

Publication number
EP0963447A1
EP0963447A1 EP98949810A EP98949810A EP0963447A1 EP 0963447 A1 EP0963447 A1 EP 0963447A1 EP 98949810 A EP98949810 A EP 98949810A EP 98949810 A EP98949810 A EP 98949810A EP 0963447 A1 EP0963447 A1 EP 0963447A1
Authority
EP
European Patent Office
Prior art keywords
slag
pressure
nozzles
distributor
steam
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Withdrawn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
EP98949810A
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
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 Holderbank Financiere Glarus AG filed Critical Holderbank Financiere Glarus AG
Publication of EP0963447A1 publication Critical patent/EP0963447A1/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Withdrawn legal-status Critical Current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
    • 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
    • C21B2400/05—Apparatus features
    • C21B2400/066—Receptacle features where the slag is treated
    • C21B2400/068—Receptacle features where the slag is treated with a sealed or controlled environment
    • 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
    • C21B2400/076—Fluidised bed for cooling
    • 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 process for granulating and comminuting molten material, in which pressurized water is applied to the slag melt and is discharged together with at least part of the steam formed, and to an apparatus for carrying out this process.
  • Metallurgical slags of suitable chemical composition are often granulated, that is, quenched with water from the melt flow with the aim of largely preventing crystallization by rapid solidification and instead achieving an amorphous, glassy structure of the granules.
  • Such granules are a valuable raw material for the production of hydraulic binders.
  • the production of these binders requires drying and fine grinding of the granules as a further step and thus two further energy-intensive processes.
  • AT-PS 400 140 has already described a process for granulating and comminuting molten material and regrind as well as a device for carrying out this process, in which the melt is introduced into a mixing chamber under pressure and pressurized water, steam or water is introduced into the mixing chamber. Steam mixtures are injected. Due to the rapid expansion, a pressure was built up in this known method, which leads to a rapid ejection of the solidified particles via a diffuser. The kinetic energy of the rapidly ejected particles could be used for comminution in this device, wherein the exit jet of the diffuser could be directed against a baffle plate or an exit jet of another diffuser.
  • the invention now aims to further develop a method of the type mentioned at the outset such that the use of the heat of slag melting in comminution work or surface enlargement work is further improved and the energy consumption is reduced and at the same time a possibility is created to substantially suppress H2S degassing .
  • the method according to the invention essentially consists in that the liquid slag is introduced into a granulation chamber in a free-flowing jet, that pressurized water jets are directed against the slag jet, whereupon the solidified and granulated slag together with at least part of the vapor formed via a pneumatic conveying line and a distributor is guided and the partial streams leaving the distributor are brought via conically tapering nozzles into a grinding chamber with a lower pressure than the granulation chamber, from which the shredded and solidified material is drawn off.
  • pressurized water is directed against the slag jet creates the prerequisite that the hydrogen sulfide formed is trapped in the slag which solidifies under pressure, so that only significantly smaller amounts of residual H2S are observed in the concentrated exhaust steam stream and an intensive and rapid cooling is achieved, with further comminution, for example in a fluidized bed counter-jet cooler or in the fluidized bed, being made possible directly via a connected line and a corresponding distribution.
  • the process is carried out in such a way that the solidified and granulated slag is passed together with the steam formed via a distributor.
  • the granulated slag stream is divided into further partial streams in the distributor, the partial streams being able to be introduced directly into a grinding chamber via conically tapering nozzles, in which a further comminution and a further grinding process take place in the fluidized bed.
  • a conventional fluidized bed counter-jet mill can be used here, with a rapid decrease in pressure here due to the condensation of water from the steam stream and in particular in the event that water is injected into the grinding chamber for cooling, thereby accelerating the condensation after leaving the grinding chamber. with which even a subatmospheric pressure can be reached, so that grinding work can be carried out by mechanical acceleration and use of the condensation enthalpy.
  • the effect of the inclusion of H2S in glass-like solidifying slag can be further improved by the fact that the granulation is carried out in a pressure-tightly closable container, as is the case with a preferred method.
  • the process according to the invention is advantageously carried out in such a way that the liquid slag is placed in a tiltable and / or slag pan formed with a floor scraper in the pressure-tightly closable container and that the slag jet is formed by tilting the slag pan or opening the bottom slide.
  • the flameproof sealable container offers the essential prerequisite for effectively suppressing H2S degassing, whereby a tiltable slag pan allows a slag jet to be formed in a simple manner, against which pressurized water for rapid achievement of an amorphous product, which in the glass phase, i.e. solidified in a metastable phase, can be directed.
  • the process according to the invention is carried out with particular advantage in such a way that part of the steam formed is via steam nozzles is introduced into the grinding chamber. If the amount of steam formed in the slag pan exceeds the absorption capacity of the nozzles provided for introducing the granulated slag into the grinding chamber, the excess steam can also be used energetically for the grinding process.
  • the undesired H2S degassing is effectively suppressed if, as is the case for a preferred implementation of the method according to the invention, the pressure in the pressure-resistant container is selected at 2 to 15 bar.
  • the process can be carried out with relatively small amounts of water, so that superheated steam is produced.
  • the high heat of slag serves to overheat the intermediate saturated steam, which prevents the formation of a liquid water phase.
  • the addition of water can be limited to about 0.8 t water / t slag, with further pressures of 10 bar at temperatures of 450 ° C. and a specific amount of steam of about 900 Nm ⁇ / t slag.
  • the removal of excess hydrogen sulfide, which should or can no longer be circulated, from the amount of steam leaving the process can subsequently be carried out in a conventional manner, for example using the Claus process, by oxidizing hydrogen sulfide to elemental sulfur and water.
  • the compliance with special parameters for the flow velocity of the material flow leaving the pressure-resistant container is of particular importance.
  • the procedure according to the invention is such that the flow rate of the material flow leaving the pressure-proof space via the distributor is selected to be 10 to 30 m / s, thereby ensuring that wear in the discharge lines remains manageable over a long period of time and at the same time precompacting of the fluidized particle stream is made possible by appropriate shaping of the line.
  • the system is advantageously dimensioned such that the nozzle outlet speed in the grinding chamber is selected at 150 to 500 m / s, the grinding effect being able to be improved even further by the pressure in the grinding chamber in the Connection to the nozzle orifices to values below 1 bar, in particular 0.3 to 0.5 bar, is relaxed.
  • Such a relaxation of the pressure in the grinding chamber to values below 1 bar is particularly easy when cold water is injected into the grinding chamber in an amount at which the dew point has not yet been reached, with cooling leading to rapid condensation of the steam outside of the grinding chamber and thus a rapid reduction in pressure with simultaneous release of the enthalpy of conversion of steam into condensed water.
  • the process is advantageously carried out in such a way that the granulate flow rate and the granulate flow density in lines which follow the distributor and lead to the nozzles and differ from one another by a maximum of 8%, preferably a maximum of 5 %, may be chosen to be different.
  • a plurality of lines can be connected to the distributor, each of which leads to different nozzles, the wear of which like nozzles can be significantly reduced if ceramic and in particular silicon carbide is selected as the material.
  • the inner wall of the lines or the nozzles can be further protected against premature wear by appropriate coating and in particular by ceramic coatings.
  • the device according to the invention for carrying out the method according to the invention is advantageously designed such that the granulation chamber for the liquid slag is connected to the distributor via a curved, in particular S-shaped, curved line, the distributor being designed as a fork which is mirror-symmetrical to the plane of curvature of the curved line is designed as a mirror plane.
  • a curved line leads to a pre-compacting of the fluidized material in the areas of the change in direction of the particle flow, with caking with certainty being avoided with regard to the flow rate that is preferred.
  • a plurality of such curvatures leads to a compact, homogeneous material flow which can be divided into partial flows in a simple manner.
  • the design is such that at least two substream lines of essentially the same internal cross-section are connected to the nozzles in the grinding chamber, the axes of the nozzle orifices advantageously being directed towards a common point in order to achieve an optimal grinding effect.
  • the design is particularly advantageous so that steam nozzles open into the grinding chamber, which are connected to the container via lines, with which part of the steam can be introduced directly into the grinding chamber from the pressure-tightly closable container.
  • the design is advantageously made in such a way that the cone angle of the nozzles is chosen between 5 ° and 30 °, the division of the flow into the partial flows being able to be implemented in a particularly simple manner without great design difficulties if, as is the case preferred development corresponds, the partial flow lines are connected to a curved part of the line connected to the pressure-tight sealable container.
  • the partial flow lines thus connect to a region of the lines in which a further change in flow direction takes place, so that a simple division into the partial flows takes place.
  • the small cone angle and the resulting length of the nozzle ensure that the acceleration of the steam speed also accelerates the particle flow to a high degree.
  • FIG. 1 shows a schematic representation of the overall system
  • FIG. 2 shows an enlarged representation of the closed grinding chamber
  • FIG. 3 shows a modified embodiment in the representation according to FIG. 2
  • FIG. 4 shows an enlarged sectional representation through the nozzles for the pressure water supply.
  • a pressure-tightly closable container 1 shows a pressure-tightly closable container 1, in which a slag pan 2 is arranged to be pivotable about an axis 3 in the direction of the double arrow 4.
  • the lid 6 of the pressure-tightly closable container 1 can be closed, whereupon after the slag pan 2 has tilted a slag jet 7 can be formed about the axis 3.
  • the slag atomization is carried out by pressurizing this slag jet 7 with pressurized water, the corresponding ring nozzles being indicated by 8 and the ring line for the pressurized water by 9.
  • the illustration is only schematic, it being possible for the nozzle planes to be arranged radially around the slag jet 7. However, these nozzles can equally well be offset in the axial direction and / or arranged at an angle to the slag jet, it being possible to choose conventional nozzle shapes.
  • the water pressure of the pressurized water advantageously being chosen between 40 and 60 bar in order to achieve a sufficient reduction to a diameter of ⁇ 0.6 mm. In this way, crushing to a particle diameter of up to 300 ⁇ m can be achieved.
  • the fluidized jet leaves the container which can be closed in a pressure-tight manner via an S-shaped curved line 10, a compacting being used in the area of the curvatures 11 and 12, which can point in different directions.
  • the fact that the flow speed is set here at approximately 15 m / s ensures a homogeneous flow without mechanical overloading of the tube walls.
  • the particle stream subsequently arrives at a distributor 13, in which the granulate is divided, the partial streams being conducted via lines 14 and 15 into a closed fluidized bed jet mill 16.
  • the partial flows emerge via conically tapering nozzles 17, as a result of which an intensive swirling in the grinding chamber and a corresponding grinding effect is achieved.
  • the essentially closed fluidized bed jet mill can be acted upon with water, the dew point not falling below, so that outside the grinding chamber a faster condensation and a rapid pressure reduction with further use of kinetic energy and rapid use the enthalpy of conversion of the Steam succeeds.
  • the fine material is discharged via a classifier, the classifying wheel of which is designated 19.
  • the fine material passes through line 20 to a separator 21, from which the ground material can be discharged via a lock, in particular cellular wheel lock 22, and line 23.
  • the steam is subsequently condensed, and the water formed can be returned to the ring line 9 via a pump 24.
  • An exhaust gas which may also contain H2S, can be drawn off from the gas space of the condenser 25.
  • gases are fed via line 26 to a Claus plant 27, in which H2S is converted with oxygen to H2O and sulfur. As a result, normal gas cleaning can be carried out.
  • the fluidized bed jet mill 16 can be given further materials to be comminuted, such as clinker, but with regard to the pressure level, the further regrind can only be introduced here via the filler neck 28 using a lock, for example a cellular wheel lock 29. With regard to the negative pressure in the fluidized bed jet mill 16, however, a suction effect can also be used.
  • the lines for the partial particle flows which are designated by 14 and 15, end in the interior of the fluidized bed jet mill 16 in a grinding chamber, the center of the grinding chamber or the grinding point being designated by 30.
  • the axes 31 of the nozzles 17 are directed towards this center of the grinding chamber, the conicity of the nozzles being chosen such that the angle ⁇ is chosen between 5 ° and 30 °.
  • a further acceleration to speeds of at least 150 to 300 m / s thus takes place in the area of the nozzles.
  • the fine material is again discharged via the classifying wheel 19 and the hollow shaft 32, which opens into the line 20.
  • filling levels of up to 600 kg water vapor / t slag, temperatures of approximately 450 ° C. and steam pressures of the order of magnitude of approximately 10 bar can thus be set within the device according to the invention, this pressure in the mill being down to 0 , 3 bar can drop due to steam condensation.
  • the selected nozzle shape allows the steam jet and the slag particle jet to be accelerated, the low taper being required to ensure that the speed difference between the slag particles and the speed of the steam jet remains small.
  • the acceleration should therefore primarily be limited to the slag particles and not only to the steam jet, which is achieved by choosing the angle ⁇ , as defined above, to be correspondingly small.
  • the wear properties can be improved by coating the nozzles, for example with silicon carbide.
  • steam finenesses of up to 6500 Blaine can be achieved.
  • the fineness of grinding can also be increased by further measures, as can be seen, for example, in FIG. 3.
  • additional steam nozzles 33 are provided, via which additional steam can be expanded into the grinding chamber.
  • a two-substance nozzle is indicated schematically via line 34, via which additional steam and / or additional ground material can be introduced into the nozzles 31.
  • the introduction takes place correspondingly symmetrically in order to provide the maximum of the kinetic energy at the grinding point.
  • the slot nozzle has an annular channel for the feed of pressurized water, which in turn is designated 9 in accordance with the illustration of FIG. 1.
  • the pressurized water flows out through the slit 35 and strikes the free-flowing liquid slag stream 7, thereby ensuring intensive and rapid glass-like solidification.
  • the granulation chamber is thus formed in the immediate inlet area of the pressurized water and is geometrically delimited by the wall 36 of the nozzle assembly 37.
  • the granulate emerges in the direction of the arrows 38 as a microgranular stream with an average diameter between 300 ⁇ m and 0.5 mm.
  • the cone angle of the slot nozzles ⁇ should be a maximum of 90 ° in order to ensure a corresponding pressure effect on the solidifying particles, thereby favoring the inclusion of H2S.
  • Several such atomizing nozzles can be arranged sequentially in the nozzle assembly 37, as a result of which the granulation fineness can be increased accordingly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Disintegrating Or Milling (AREA)
  • Manufacture Of Iron (AREA)

Abstract

L'invention concerne un procédé de granulation et de fragmentation d'un matériau en fusion, selon lequel des scories en fusion sont soumises à l'action d'eau sous pression et évacuées avec la vapeur formée. Les scories liquides sont introduites, sous la forme d'un jet à écoulement libre, dans une chambre de granulation, des jets d'eau sous pression étant dirigés contre ce jet de scories. Ensuite, les scories solidifiées et granulées sont guidées, avec la vapeur formée, dans une conduite de transport pneumatique et un répartiteur. Les courants partiels quittant le répartiteur sont amenés, par l'intermédiaire de buses se rétrécissant de façon conique, dans une chambre de broyage dans laquelle règne une pression plus faible que celle régnant dans la chambre de granulation, le matériau fractionné et solidifié étant extrait de cette chambre de broyage.
EP98949810A 1997-10-29 1998-10-14 Procede de granulation et de fragmentation d'un materiau en fusion, et dispositif pour la mise en oeuvre de ce procede Withdrawn EP0963447A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT182697U 1997-10-29
AT0182697A AT405511B (de) 1997-10-29 1997-10-29 Verfahren zum granulieren und zerkleinern von schmelzflüssigem material sowie vorrichtung zur durchführung dieses verfahrens
PCT/AT1998/000243 WO1999022031A1 (fr) 1997-10-29 1998-10-14 Procede de granulation et de fragmentation d'un materiau en fusion, et dispositif pour la mise en oeuvre de ce procede

Publications (1)

Publication Number Publication Date
EP0963447A1 true EP0963447A1 (fr) 1999-12-15

Family

ID=3521830

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98949810A Withdrawn EP0963447A1 (fr) 1997-10-29 1998-10-14 Procede de granulation et de fragmentation d'un materiau en fusion, et dispositif pour la mise en oeuvre de ce procede

Country Status (10)

Country Link
US (1) US6082640A (fr)
EP (1) EP0963447A1 (fr)
AT (1) AT405511B (fr)
AU (1) AU730428B2 (fr)
CA (1) CA2276083A1 (fr)
CZ (1) CZ9902306A3 (fr)
HU (1) HUP0000688A2 (fr)
SK (1) SK77399A3 (fr)
WO (1) WO1999022031A1 (fr)
ZA (1) ZA989596B (fr)

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DE10011300A1 (de) 1999-03-10 2000-09-14 Sumitomo Spec Metals Mahlvorrichtung und Mahlverfahren zum Herstellen von Pulver
AT407525B (de) * 1999-07-09 2001-04-25 Holderbank Financ Glarus Verfahren zum zerkleinern von stückgut oder granulat sowie vorrichtung zur durchführung dieses verfahrens
AT408220B (de) * 1999-12-28 2001-09-25 Holderbank Financ Glarus Verfahren und vorrichtung zum granulieren und zerkleinern von schlackenschmelzen
AT408436B (de) * 2000-01-13 2001-11-26 Holderbank Financ Glarus Verfahren zum granulieren von flüssigen schlacken
AT410219B (de) * 2001-05-10 2003-03-25 Tribovent Verfahrensentwicklg Verfahren zum zerstäuben von schmelzflüssigem material, wie z.b. flüssigen schlacken, glasschmelzen und/oder metallschmelzen sowie vorrichtung zur durchführung dieses verfahrens
WO2007145384A1 (fr) * 2006-06-14 2007-12-21 Ecomaister Co., Ltd. Procédé de stabilisation des scories et nouvelles matières obtenues par ce procédé
US20110052688A1 (en) * 2006-11-21 2011-03-03 San-Laung Chow Solid dispersion composition
WO2008064259A2 (fr) * 2006-11-21 2008-05-29 Biokey, Inc. Composition de dispersion solide
US9914132B2 (en) 2011-09-15 2018-03-13 Michael J. Pilgrim Devices, systems, and methods for processing heterogeneous materials
US8646705B2 (en) * 2011-09-15 2014-02-11 Ablation Technologies, Llc Devices, systems, and methods for processing heterogeneous materials
WO2015084417A1 (fr) * 2013-12-02 2015-06-11 Ablation Technologies, Llc Dispositifs, systèmes et procédés de traitement de matières hétérogènes
KR20170060029A (ko) * 2014-09-21 2017-05-31 해치 리미티드 부산물 오프가스를 사용하는 용융 물질의 가스 분무화
US10889744B2 (en) 2019-04-26 2021-01-12 Signet Aggregates, Llc Clarification of colloidal suspensions

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US3615329A (en) * 1969-03-18 1971-10-26 American Smelting Refining A recirculatory system for the granulation of molten slag
US4218201A (en) * 1978-07-25 1980-08-19 Nippon Steel Corporation Apparatus for producing solidified granular slag from molten blast furnace slag
JPS591227B2 (ja) * 1980-04-10 1984-01-11 濱田重工株式会社 球形膨張スラグの製造方法及び装置
JPS57134501A (en) * 1981-02-13 1982-08-19 Nippon Steel Corp Method for recovery of sensible heat of blast furnace slag
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AT400140B (de) * 1993-12-03 1995-10-25 Holderbank Financ Glarus Verfahren zum granulieren und zerkleinern von schmelzflüssigem material und mahlgut sowie einrichtung zur durchführung dieses verfahrens
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Also Published As

Publication number Publication date
US6082640A (en) 2000-07-04
ZA989596B (en) 1999-04-23
CA2276083A1 (fr) 1999-05-06
ATA182697A (de) 1999-01-15
WO1999022031A1 (fr) 1999-05-06
CZ9902306A3 (cs) 2001-06-13
HUP0000688A2 (hu) 2000-08-28
AU730428B2 (en) 2001-03-08
AU9615098A (en) 1999-05-17
AT405511B (de) 1999-09-27
SK77399A3 (en) 1999-12-10

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