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WO2001004363A1 - Procede pour broyer un article isole ou un granulat, et dispositif pour mettre en oeuvre ledit procede - Google Patents

Procede pour broyer un article isole ou un granulat, et dispositif pour mettre en oeuvre ledit procede Download PDF

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Publication number
WO2001004363A1
WO2001004363A1 PCT/AT2000/000179 AT0000179W WO0104363A1 WO 2001004363 A1 WO2001004363 A1 WO 2001004363A1 AT 0000179 W AT0000179 W AT 0000179W WO 0104363 A1 WO0104363 A1 WO 0104363A1
Authority
WO
WIPO (PCT)
Prior art keywords
grinding
chamber
pressure
grinding media
slag
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/AT2000/000179
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
Priority to AU57950/00A priority Critical patent/AU5795000A/en
Priority to EP00943456A priority patent/EP1121473A1/fr
Publication of WO2001004363A1 publication Critical patent/WO2001004363A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/06—Jet mills
    • B02C19/068—Jet mills of the fluidised-bed type
    • 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
    • C21B2400/066—Receptacle features where the slag is treated
    • C21B2400/076—Fluidised bed for cooling

Definitions

  • the invention relates to a method for comminuting piece goods or granules, in which the ground material is introduced into a mill with a propellant.
  • AT 405 511 B has already disclosed a method for comminuting granules, in which pressurized water is applied to the slag melt and the granules were discharged together with at least part of the steam formed.
  • pressurized water is applied to the slag melt and the granules were discharged together with at least part of the steam formed.
  • rapid solidification is achieved, in which crystallization is to be largely prevented, and instead an amorphous, glassy structure of the granules is achieved.
  • a suitable chemical composition of the molten slag such granules can result in valuable raw materials for the production of hydraulic binders, as a rule intensive comminution and, in particular, a grinding process being required as a result.
  • the heat of the slag melt be used energetically for the size reduction work or surface enlargement work and in this way to reduce the energy consumption.
  • the liquid slag was introduced into a granulation chamber in free-flowing jets, whereupon pressurized water jets were directed against the slag jet and the solidified and granulated slag together with at least a part of the steam formed was passed through a pneumatic conveying line and a distributor, and subsequently the partial streams were introduced into a grinding chamber via multi-component nozzles and in particular conically tapering nozzles.
  • the grinding room was operated in the manner of a countercurrent mill.
  • the formation of two-phase nozzles required for this mode of operation, via which steam and granules were introduced into the grinding chamber required relatively expensive nozzle designs, such Two-phase nozzle systems have proven to be relatively susceptible to wear.
  • the process according to the invention essentially consists in holding grinding media, in particular balls, in a fixed bed or fluidized bed or in a fluidized bed, the propellant medium loaded with piece goods or granules being filled with grinding media in the propellant Space is expanded or evaporated, whereupon the regrind is withdrawn from the mill via a classifier. Because the grinding chamber contains grinding media, cavities remain between the grinding media, each of which becomes effective in the manner of a large number of individual nozzles in the interior of the fixed bed or the fluidized bed.
  • the grinding media which can be designed in particular as grinding balls, can also have different diameters, so that a spherical radius gradient is formed in the interior of a fluidized bed, in which the flow of the pressurized propellant medium expands together with the piece goods. The same applies to the nozzle-like cavities between balls in a fixed bed.
  • the process according to the invention can be carried out in a particularly advantageous manner in such a way that the liquid melts are granulated in water under superatmospheric pressure and that the granules are introduced into the mill together with the wet steam under superatmospheric pressure.
  • Wet steam refers to mixtures of liquid and gaseous phases, which can also be referred to as fog.
  • pressure and temperature should be selected so that when the pressure in the mill is reduced or during expansion, overheated, ie dry steam is formed, so that materials, which tend to be hydrated or lose their hydraulic properties through water are not destroyed first.
  • the wet steam itself usually has a temperature of over 150 ° C and can be introduced into the grinding chamber under a pressure of more than 5 bar, the expansion with formation of steam leading to an approximately 1500-fold increase in volume and superheated steam being formed within the layer filled with grinding media or grinding balls, so that the fine material formed does not hydrate.
  • the grinding media bed can contain different grinding media and, for example, also active as grinding media, such as clinker and pozzolans. Total microns can be obtained with such a method, a crushing to a d m ax ⁇ 75, can be followed by viewing in the sequence by conventional methods.
  • the water quality does not have to meet any special purity requirements, and even slightly polluted waste water can be disposed of.
  • the slag melt can be fed into the pelletizing chamber discontinuously via slag pans or continuously via slag channels and pressure locks.
  • a total of between 0.57 kg water / kg slag and 2.25 kg water / kg slag are used.
  • wet steam is formed, consisting of 0.6 kg of steam and 0.4 kg of water per kg of slag.
  • the expansion into the grinding chamber in which there is, for example, a pressure of 0.2 bar, leads to the generation of slightly superheated steam.
  • the relaxation would About 750 l (0.75 m 3 ) of steam are generated in the ball grinding chamber per kg of slag.
  • the volume change work from the water contained in the wet steam to steam is largely converted into shredding work, which results in high energetic advantages over conventional systems.
  • the process according to the invention is advantageously carried out in such a way that the grinding media are circulated and subjected to a change in temperature.
  • the fineness of grinding can be further increased by an energy transfer that is particularly favorable for the grinding process from the grinding media to the material to be ground, the grinding media advantageously being heated to temperatures of> 600 ° C. and introduced into the grinding chamber CaC03.
  • CaC ⁇ 3 By introducing CaC ⁇ 3 into the grinding chamber, calcination and simultaneous splitting into CaO and C ⁇ 2 takes place, which on the one hand leads to an improvement in the hydraulic properties of the material to be ground and on the other hand to a further increase in volume and consequently to a better size reduction of the material to be ground.
  • the circulation of the grinding media also creates the conditions for efficient cleaning of the grinding media.
  • the grinding media can advantageously be equipped with catalysts such as e.g. Ni or Ni oxide coated can be used. In this way, chemical reactions can also be superimposed on the mechanical grinding process.
  • the grinding media can also be subjected to a cooling process in the circuit, which facilitates the grinding of heat-sensitive products.
  • the process according to the invention is advantageously carried out in such a way that metal balls or ceramic balls are used as grinding media, the procedure in any case being such that the grinding chamber is kept under a lower pressure than the granulating chamber.
  • a particularly simple control is possible, whereby it is only sufficient to switch on an appropriately adjustable control valve in the pressure line, thereby simultaneously ensuring the respectively required amount of water in the pelletizing chamber and the corresponding expansion into the fluid bed filled with grinding media.
  • the process according to the invention is advantageously carried out in such a way that the drive medium is introduced into the mill in a pulsating manner.
  • the fluidized bed formed by the grinding media is periodically built up and broken down, so that a further grinding effect arises from the fact that balls lying higher up come to lie on the grinding media lying beneath them under the action of gravity when the fluidized bed collapses, and thus comminute the grinding material located between them.
  • regrind that is not sensitive to hydration, e.g. Puzzolane, for example cold pressurized water with a pressure of approx. 100 bar can be selected as the propellant.
  • the pulsation can be achieved particularly easily by slow-running high-pressure piston pumps.
  • the device according to the invention for carrying out this method is essentially characterized by a grinding chamber which is at least partially filled with grinding media and to which at least one connection or a pressure-resistant line for introducing the grinding stock and the propellant and at least one line for withdrawing the grinding stock is connected.
  • a grinding chamber which is at least partially filled with grinding media and to which at least one connection or a pressure-resistant line for introducing the grinding stock and the propellant and at least one line for withdrawing the grinding stock is connected.
  • a device is particularly suitable for grinding lime, mica, clays, oxidation-sensitive products or organic color pigments, for example using superheated steam or inert gases (N2, Ar) as blowing agents.
  • the device is further characterized by two chambers connected via a pressure-resistant line, the first chamber being a pressure-resistant pelletizing chamber with a Feeding device is designed for liquid slag and is at least partially filled with water and the second chamber is designed as a grinding chamber with a discharge for regrind, which is at least partially filled with grinding media, the pressure-resistant line from the water-filled space of the granulating chamber into the Grinding bodies filled space of the grinding chamber opens.
  • the design here is advantageously such that the pressure-resistant line is connected to the grinding chamber below the grinding media, the pressure-resistant line advantageously having at least one control or shut-off valve for setting the required water level in the granulation chamber and the desired expansion into the grinding chamber.
  • the grinding media and in particular grinding balls in the interior of the grinding chamber can be brought into an appropriate fluidized form before the first expansion of hot wet steam, which is loaded with granules, for which purpose steam or compressed air can be used, for example.
  • the design according to the invention is made in such a way that the grinding chamber has a grate or sieve plates to support the grinding media, so that the desired geometry inside the grinding chamber can be easily maintained.
  • the grinding media for the formation of a fluidized bed have a diameter of less than 10 mm, and preferably less than 5 mm, in order to be able to maintain a corresponding fluidized bed without additional measures.
  • Grinding bodies for a fixed bed can have correspondingly larger diameters, with balls being geometrically preferred for forming the nozzle-shaped spaces in the bed.
  • the grinding effect is achieved here by accelerating the particle flow in the nozzle-like spaces and hitting the granules on the grinding media of the fixed bed.
  • the fine material can be separated in a conventional manner in such a way that a classifier, in particular a cyclone, is connected to the discharge openings for the ground material, and that coarse material separated in the classifier is returned to the grinding chamber.
  • the device is advantageously designed so that a discharge device for the grinding media is connected to the space filled with grinding media, which feeds the grinding media back into the grinding chamber via a heat exchanger.
  • the grinding media can either be heated or cooled in the heat exchanger according to the properties of the product to be ground.
  • the device can be designed in such a way that at least one further line for pressurized water, reducing gases and / or gases which can be decomposed by increasing the volume is connected to the grinding chamber.
  • FIG. 1 shows a first embodiment of a device suitable for carrying out the method according to the invention
  • FIG. 2 shows an alternative embodiment.
  • 1 denotes a first pressure-resistant chamber, which is designed as a granulating chamber.
  • the chamber 1 has a cover 2, which is connected to the wall 3 of the granulating chamber in a pressure test, water 4 being placed in the interior of the granulating chamber.
  • the water level is indicated by 5.
  • the task of liquid slag is indicated here schematically by a pivotable slag pan 6, whereby alternatively other task forms, such as slag channels or corresponding locks, can be provided.
  • slag granules 7 being formed which are drawn off together with the hot wet steam via a line 8.
  • the wet steam here has a temperature of approximately 150 ° C., the steam pressure being set at approximately 5 bar.
  • the wet steam granulate flow reaches the bottom 10 of a grinding chamber 11 via a controllable shut-off valve 9.
  • a grate 12 is provided on the inside of the grinding chamber 11, on which there is a bed of grinding media 13. In the case of appropriately small-sized grinding media, a fluidized bed can be set by appropriate flow, so that the grinding effect is supported by the movement of the grinding media.
  • a fixed bed can also be present here, corresponding nozzle-shaped interspaces being formed in the interspaces between the grinding media 13, in which the expanding steam accelerates together with the particle flow or the particles rapidly disintegrate by hitting the grinding media let it slow down again.
  • a feed device 14 further grinding aids or additives can be introduced into the space filled with grinding media and, in particular, spheres, in which case already solidified slag or CaC03 can also be fed in here.
  • the pressure inside the grinding chamber 11 is generally lower than the pressure in the pressure granulator, so that the wet steam gets into the grinding chamber from the pressure granulator without additional pumps.
  • a discharge line 15 is connected to the grinding chamber 11, via which the grinding elements are fed to a heat exchanger 16, whereupon the grinding elements of the grinding chamber 11 which are subjected to a change in temperature are returned.
  • the ground material is drawn off from the grinding chamber via a line 17 and fed to a classifier 18.
  • Coarse material is drawn off via line 19 and a rotary valve 20 and can at least partially be returned to grinding chamber 11 via line 21.
  • the remaining fine material, which leaves the classifier reaches a filter 22 and is discharged there via a rotary valve 23 and a line 24.
  • the vapor drawn off via line 25 can subsequently be condensed and fed back into the pressure granulator as water. Pressurized water, reducing gases and / or gases which can be decomposed with an increase in volume can be supplied to the grinding chamber 11 via a line 26.
  • FIG. 2 shows an alternative embodiment of a device suitable for carrying out the method according to the invention.
  • a slag tundish is designated, in which liquid slag 28 is kept at the appropriate temperature.
  • a throttle tube 29 is immersed in the slag bath 28 and is height-adjustable in the direction of the double arrow 30 is so that between the lower edge of the throttle tube 29 and the slag outlet opening 31 of the slag tundish 27 there remains a throttle gap over which a tubular slag jet is formed.
  • a steam jet pipe 32 into which steam can be injected, opens into the interior of the throttle pipe 29.
  • the slag outlet opening 31 is designed as a cooled annular chamber through which cooling water flows.
  • the extremely fine droplets of slag ejected in this way are acted upon by quench water emerging from the ring nozzle 33, whereupon the droplets of droplets subsequently reach the area of a radiation cooler 34, which is designed as a radiation steam boiler.
  • a radiation cooler 34 which is designed as a radiation steam boiler.
  • High-pressure feed water with a maximum pressure of 10 bar is fed to the radiation steam boiler, the cooling chambers being forced through and high-pressure steam can be drawn off.
  • a temperature of approximately 950 ° C. prevails at the point of impact of the quench water on the slag droplets, whereas the particle particles at the lower end of the radiation cooler have a temperature of approximately 400 ° C.
  • the particles subsequently hit a fixed bed of jet grinding balls which have a diameter of greater than 10 mm, preferably at least 30 to 40 mm.
  • Corresponding nozzle-shaped spaces are formed in the spaces between the grinding balls 35, in which the steam is accelerated together with the particle flow or the particles can be decelerated again quickly by disintegration when they hit the grinding elements.
  • the finely ground granules obtained in this way are drawn off via a line 36 and a filter 37 and a cellular wheel sluice 38.
  • the grinding powder has a grain size of between 5 and 45 ⁇ m.
  • the steam emerging from the radiation steam boiler 34 can be drawn off via a steam drum 39 and possibly be reused as motive steam for atomizing the slag with the interposition of a superheater 40.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Food Science & Technology (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 pour broyer un article isolé ou un granulat, selon lequel la matière à broyer est introduite dans un broyeur au moyen d'un agent propulseur. Ce procédé consiste à maintenir, dans le broyeur, les éléments broyeurs (35), notamment des boules, dans un lit fixe ou un lit fluidisé, à provoquer l'expansion ou l'évaporation de l'agent propulseur contenant l'article isolé ou le granulat, dans la zone remplie d'éléments broyeurs (35), puis à retirer du broyeur la matière broyée par l'intermédiaire d'un séparateur (37). L'invention concerne un dispositif correspondant pourvue d'une chambre de broyage qui est remplie au moins partiellement d'éléments broyeurs (35), et à laquelle sont raccordés au moins un raccord ou une conduite résistant à la pression, servant à introduire la matière à broyer et l'agent propulseur, et au moins une conduite (36) servant à retirer la matière broyée.
PCT/AT2000/000179 1999-07-09 2000-06-30 Procede pour broyer un article isole ou un granulat, et dispositif pour mettre en oeuvre ledit procede Ceased WO2001004363A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU57950/00A AU5795000A (en) 1999-07-09 2000-06-30 Method for comminuting bulk material or a granulate and a device for carrying out said method
EP00943456A EP1121473A1 (fr) 1999-07-09 2000-06-30 Procede pour broyer un article isole ou un granulat, et dispositif pour mettre en oeuvre ledit procede

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0119999A AT407525B (de) 1999-07-09 1999-07-09 Verfahren zum zerkleinern von stückgut oder granulat sowie vorrichtung zur durchführung dieses verfahrens
ATA1199/99 1999-07-09

Publications (1)

Publication Number Publication Date
WO2001004363A1 true WO2001004363A1 (fr) 2001-01-18

Family

ID=3508761

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT2000/000179 Ceased WO2001004363A1 (fr) 1999-07-09 2000-06-30 Procede pour broyer un article isole ou un granulat, et dispositif pour mettre en oeuvre ledit procede

Country Status (4)

Country Link
EP (1) EP1121473A1 (fr)
AT (1) AT407525B (fr)
AU (1) AU5795000A (fr)
WO (1) WO2001004363A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002064257A3 (fr) * 2001-02-09 2003-04-03 Evertz Egon Kg Gmbh & Co Procede et dispositif de traitement de laitier pour l'obtention de granulats
EP1306450A1 (fr) * 2001-10-23 2003-05-02 Tribovent Verfahrensentwicklung GmbH Procédé et installation pour granuler et pulvériser des matières fondues liquides
EP1394131A3 (fr) * 2002-08-29 2007-01-17 Holcim Ltd. Procédé et dispositif pour la granulation de matériaux en fusion

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4602743A (en) * 1983-10-20 1986-07-29 Alpine Aktiengesellschaft Fluidized bed jet mill
JPH05255900A (ja) * 1992-03-10 1993-10-05 Sumitomo Metal Ind Ltd Ｚｎ−Ｎｉ系合金電気めっき方法とめっき装置
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

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH572773A5 (en) * 1974-06-07 1976-02-27 Wyhlen Ag Eisenbau Recovery of used, cold-bonded resin sand - using ball-mill linked to air sifter to obtain max. recovery
DE4306930B4 (de) * 1992-07-25 2005-11-10 Khd Humboldt Wedag Ag Anlage zur Zerkleinerung von Mahlgut

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4602743A (en) * 1983-10-20 1986-07-29 Alpine Aktiengesellschaft Fluidized bed jet mill
JPH05255900A (ja) * 1992-03-10 1993-10-05 Sumitomo Metal Ind Ltd Ｚｎ−Ｎｉ系合金電気めっき方法とめっき装置
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 030 (C - 1153) 17 January 1994 (1994-01-17) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002064257A3 (fr) * 2001-02-09 2003-04-03 Evertz Egon Kg Gmbh & Co Procede et dispositif de traitement de laitier pour l'obtention de granulats
EP1306450A1 (fr) * 2001-10-23 2003-05-02 Tribovent Verfahrensentwicklung GmbH Procédé et installation pour granuler et pulvériser des matières fondues liquides
EP1394131A3 (fr) * 2002-08-29 2007-01-17 Holcim Ltd. Procédé et dispositif pour la granulation de matériaux en fusion

Also Published As

Publication number Publication date
AT407525B (de) 2001-04-25
ATA119999A (de) 2000-08-15
EP1121473A1 (fr) 2001-08-08
AU5795000A (en) 2001-01-30

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