EP0528070A1 - Verfahren und Einrichtung zum Aufbereiten von Schüttgütern - Google Patents

Verfahren und Einrichtung zum Aufbereiten von Schüttgütern Download PDF

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Publication number
EP0528070A1
EP0528070A1 EP91115504A EP91115504A EP0528070A1 EP 0528070 A1 EP0528070 A1 EP 0528070A1 EP 91115504 A EP91115504 A EP 91115504A EP 91115504 A EP91115504 A EP 91115504A EP 0528070 A1 EP0528070 A1 EP 0528070A1
Authority
EP
European Patent Office
Prior art keywords
container
washing container
washing
bulk material
washing tank
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Withdrawn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
EP91115504A
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German (de)
English (en)
French (fr)
Inventor
Franz Gähler
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0528070A1 publication Critical patent/EP0528070A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D45/00—Equipment for casting, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/18—Plants for preparing mould materials
    • B22C5/185—Plants for preparing mould materials comprising a wet reclamation step
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/02—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
    • F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined

Definitions

  • the invention relates to a method and to a device for processing bulk materials, in particular in the form of fraction-like fractions and / or free-flowing materials, which are processed by comminution and / or wet treatment and by a subsequent thermal treatment.
  • a device for recovering foundry mold base materials in which the base material, which is in the form of a mixture of lumpy or single-grain, is fed from a comminution device through a sieve to a metal separator and from there to an annealing apparatus. Carbon-containing substances are removed from the base material of the annealing apparatus and then cooled in an assigned cooling device.
  • the cooled mold base material is pneumatically and mechanically treated and cleaned in such a way that the embrittled layer minerals flake off. The sand regenerated and classified in this way is then recycled.
  • the present invention is concerned with the problem of economical recycling of bulk goods, such as those which arise, for example, in the form of metal-containing fractions and fractional fractions by organic or chemical binders or already in the form of free-flowing, used foundry sands with different types of sand.
  • the invention has for its object to provide a method for the preparation of bulk goods in the form of fragmentary fractions and / or free-flowing materials and a device by means of which the bulk goods can be processed to a largely new, recyclable quality.
  • the object is achieved according to the method according to the invention in that the bulk material is fed to a first washing container largely free-falling and is acted upon by a number of nozzles directed into the interior of a liquid medium under high pressure to detach the adhering dirt particles and then in an assigned second washing container is cleaned and separated, and that the cleaned bulk material is then dried and passed for thermal treatment through a pipe system which is heated on the outside and rotatable about its longitudinal axis.
  • the device according to the invention for carrying out the method comprises at least a first washing container and a drum oven with a heatable combustion chamber for the thermal treatment of bulk goods and is characterized in that the second washing container is associated with a second washing container connected to it, the first washing container in its interior with a number of nozzles arranged at a distance from one another in the axial and radial directions and the second washing container with the interposition of a drying container with one in the Combustion chamber of the drum furnace arranged and rotatably mounted about its longitudinal axis, spiral-shaped piping system for the thermal treatment of the dried bulk material is connected.
  • FIG. 1 shows, as a flow diagram, a device for processing bulk goods, designated 100 in its entirety, which device 100 essentially comprises a schematically illustrated cleaning device 50 or 150 and a drum furnace 220 connected to it via a feed line 14 or 114.
  • Either the cleaning device 50, shown on a larger scale in FIG. 2, or the other, shown on a larger scale in FIG Cleaning device 150 can be assigned.
  • the cleaning device 50 or 150 is assigned a transport and conveyor belt 1, from which the so-called bulk material (not shown) is fed in the direction of the arrows 1 'and 1''to a funnel-shaped collecting container 2.
  • the bulk material is fed to the cleaning device 50 or 150 in a trickling manner by means of a sieve 3 which can be moved back and forth in the direction of the arrow 3 'by means not shown.
  • the drum furnace 220 and the two cleaning devices 50 and 150 are described in detail below.
  • the drum furnace 220 shown schematically in FIG. 1 essentially comprises a container 221, to which a burner 231 is assigned in the front part designed as input A, by means of which the interior 221 ′ of the container 221 designed as a combustion chamber is heated.
  • the container 221 can be divided into individual, heatable zones, seen in the longitudinal direction of the drum furnace 220.
  • a plurality of fuel or heating elements arranged offset from one another are provided on the outer wall of the container.
  • a first chamber 226, a filter device 222, a blower 225 and a second chamber 224 are provided on the rear part of the container 221 designed as an outlet B.
  • a grate 223 is also arranged between the first chamber 226 and the second chamber 224.
  • the filter device 222 is connected to the inlet A of the container 221 via a line 227 with the interposition of a blower 228.
  • the second chamber 224 is connected to a collecting container 230 via a line 229.
  • a distributor element 235 Arranged in the front area of the combustion chamber 221 ′ of the container 221 is a distributor element 235, for example in the form of a container, which is connected to a piping system 240 arranged in the container 221.
  • the Pipe system 240 comprises at least one, but preferably a number of spirally wound pipes 241, which are each connected at one end to the feed line 14 or to the distributor element 235 and at the outlet B to the second chamber 226.
  • the individual, spiral-like pipe 241 or else the complete pipeline system 240 is operatively connected to a schematically illustrated drive 242 arranged at the input A.
  • the pipeline system 240 is mounted in the combustion chamber 221 ′ of the container 221 so as to be rotatable about an approximately horizontal longitudinal axis X in the direction of the arrow Z.
  • the pipeline system 240 is arranged in the combustion chamber 221 ′ of the container 221 about a longitudinal axis X ′ rising relative to the longitudinal axis X or about a longitudinal axis X ′′ inclined relative to the longitudinal axis X.
  • the angle ⁇ or ⁇ 'formed between the horizontal axis X and between the rising or inclined longitudinal axis X' or X '' is in each case approximately in the order of magnitude of 10 ° to 30 °.
  • the container 221 is mounted, for example, on two foundations 245, 245 ′ spaced from one another in the axial direction of the container 221.
  • the storage of the container 221 on the two foundations 245, 245 ' can also take place in the horizontal plane.
  • the piping system 240 with the above-mentioned slope ⁇ or slope ⁇ ' is arranged in the combustion chamber 221'.
  • the container 221 with its longitudinal axis X is arranged and stored accordingly on the two foundations 245, 245' with an analogous slope or inclination.
  • the pipe cross section for the individual pipe 241 of the pipe system 240 installed in the drum furnace 220 can be of different shapes.
  • the pipe cross section of the to a spiral deformed tube can be formed in a manner not shown, for example circular, square, rectangular, triangular, polygonal, square parallel or the like. It is essential, however, for the tube cross-sectional shape that the individual spiral has the largest possible heat transfer area.
  • the cleaning device 50 shown on a larger scale and in a sectional view in FIG. 2 essentially comprises a first washing container 30 and a second washing container 40 connected to it.
  • the transport and conveyor belt 1 assigned to the washing container 30, the collecting container 2 and the and movable screen 3 are formed analogously to the embodiment described with reference to FIG. 1.
  • the pipeline system 25 Arranged on the first washing tank 30 is a schematically illustrated pipeline system 25, which is connected via a feed line 16 to a correspondingly assigned high-pressure pump 4.
  • the pipeline system 25 comprises, in the axial direction of the first washing container 30, at a distance from one another and largely encompassing the outer circumference of the washing container 30, ring lines 21, 22, 23 and 24, which are connected to the supply line 16 by corresponding web lines 17 and 18, 18 'and 19, 19' are connected to the high pressure pump 4.
  • nozzles 21 ', 22', 23 'and 24' which are arranged at a distance from one another in the circumferential direction and in the axial direction and are fastened to the container wall 30 'in a manner not shown and with the individual nozzles , Correspondingly arranged on the outer circumference of the washing container 30 ring lines 21, 22, 23 and 24 are connected.
  • a connecting flange 31 is arranged on the first washing container 30, which flange is used for the sealing attachment of the second Washer tank 40 is provided with an annular groove 31 '.
  • the second washing tank 40 which is fastened to the first washing tank 30 by means not shown and, for example, forms a unit therewith, essentially comprises a cylinder body 42 arranged in the annular groove 31 'of the first washing tank 30 and a flange 41 arranged thereon.
  • a filter element 43 is arranged, for example, as a steel jacket or as a transparent body for functional illustration.
  • the interior 45 of the cylinder body 42 is divided by the filter element 43 into a first chamber 45 'for the actual bulk material (not shown) and into a second chamber 46 for detached sludge 47 and stored at the bottom of the annular chamber 46.
  • an essentially funnel-shaped opening 44 is provided for emptying.
  • a line 8 which is connected to the opening 44 and is sealed at the lower flange 41 and has a shutoff valve 9, is also connected to the second washing tank 40.
  • the line 8 leads to a correspondingly assigned container 6, preferably provided with a sieve 7, which is connected to a filter press 5 via a return line 12 with the interposition of a valve 13.
  • the liquid is returned to the high-pressure pump 4 in the direction of the arrow 12 'via the filter press 5 and via a line 15 in the direction of the arrow 15' and from there via the pipeline system 25 to the first washing tank 30 again.
  • the cleaned sand (not shown) is fed to the drum furnace 220 via line 14 in the direction of arrow 14 'for the thermal treatment.
  • a slide 203 can be arranged in the line 14 between the container 6 and the drum furnace 220, which slide can be opened and closed with a correspondingly controllable one Piston / cylinder unit 202 is operatively connected.
  • a line 11 is also connected to the lower flange 41 of the second washing container 40 with the interposition of a valve 10, via which the slurry 47 is fed to the filter press 5 according to the direction of the arrow 10 '.
  • the residual liquid separated by the filter press 5 is also fed via line 15 in the direction of arrow 15 'to the high-pressure pump 4, while the remaining solids are fed via line 11' in the direction of arrow 11 '' to a system (not shown) for further processing.
  • FIG. 3 shows the washing device 150 on a larger scale and in a sectional view, and a first washing container 130 and a second washing container 140 connected therewith can be seen.
  • the transport and conveyor belt 1 assigned to the washing container 130, the collecting container 2 and that back and forth movable screen 3 are formed analogously to the embodiment described with reference to FIG. 1.
  • a schematically illustrated pipeline system Arranged on the first washing tank 130 is a schematically illustrated pipeline system, designated in its entirety by 125, which is connected to a correspondingly assigned high-pressure pump 104 via a feed line 116 designed as a web line.
  • the pipeline system 125 comprises, seen in the axial direction of the washing tank 130, a plurality of ring lines 121, 120, 119, 118 and 117 which are arranged at a distance from one another and encompass approximately half of the outer circumference of the tank 130 and which are connected to the high-pressure pump 104 via the corresponding feed line 116.
  • each individual ring line 121, 120, 119, 118 and 117 is assigned correspondingly designed high-pressure nozzles.
  • the high-pressure nozzles forming a group are 121 ', 120', 119 ', 118' and 117 ', wherein the individual high-pressure nozzles are fastened to the container wall 130' in a manner not shown.
  • a correspondingly arranged and fastened baffle plate 136 is provided in the interior 135 of the washing container 130.
  • a connection flange 131 is arranged on the first washing tank 130, which flange is provided with an annular groove 131 ′ for the sealing attachment of the second washing tank 140.
  • the second washing tank 140 which is fastened to the first washing tank 130 by means not shown and forms a unit therewith essentially comprises a cylinder body 142 arranged in the annular groove 131 'of the first washing tank 130 and a flange 141 arranged thereon.
  • a filter element 143 is arranged, for example, as a steel jacket or as a transparent body for functional illustration.
  • the interior 145 of the cylinder body 142 is divided by the filter element 143 into a first chamber 145 'for the actual bulk material (not shown) and into a second chamber 146 for detached slurry 147.
  • An opening funnel-shaped opening 144 is provided in the lower flange 141 for emptying.
  • a line 108 which is arranged in a sealed manner on the lower flange 141 and has a shutoff valve 109, is also connected to the second washing tank 140.
  • the line 108 leads to a correspondingly assigned container 106, which is preferably provided with a sieve 107 and which is connected to a filter press 105 via a return line 112 via a return line 112.
  • the cleaned sand is essentially fed to the drum furnace 220 (FIG.
  • a line 111 is also connected to the lower flange 141 of the second washing container 140 with the interposition of a valve 110, via which the slurry 147 is fed to the filter press 105 in the direction of the arrow 110 '.
  • the liquid separated from the filter press 105 is fed via line 115 in the direction of arrow 115 'to the high-pressure pump 104, while the remaining solids are fed via line 111' in the direction of arrow 111 '' to a system (not shown) for further processing.
  • a sound transducer 80 or 180 which is operatively connected to an ultrasound device 85 or 185 can be arranged.
  • a permanent movement of the bulk material is additionally generated in the washing container 40 or 140, thereby further detaching the dirt particles.
  • the second washing container 40 or 140 is assigned a sieve-shaped collecting element instead of the first washing container 30 or 130, on which the bulk material supplied from the container 2 rests and from the high-pressure liquid medium for detaching the adhering dirt particles is applied.
  • the nozzles are directed at a corresponding angle to the bulk material or to the sieve-like collecting element.
  • FIG. 4 shows the washing device 150 shown in section and in plan view according to the line IV-IV in FIG. 3, and one recognizes the washing tank 130 and the pipeline system 125 arranged thereon with the one ring line 118 connected to the feed line 116.
  • the baffle plate 136 arranged and fastened on the inner wall 130 'and the group designated 118' in its entirety High pressure nozzles.
  • the individual high-pressure nozzles which are not described in any more detail, are arranged at a distance from one another in the circumferential direction on the container wall 130 'and are fastened to it in a manner not shown.
  • the so-called bulk material is fed in the direction of the arrows 1 'and 1''to the first washing container 30 or 130, in which the free-falling bulk material by means of several, correspondingly distributed high-pressure nozzles 21', 22 ', 23', 24 'or 121', 120 ', 119', 118 ', 117' is acted upon by a liquid medium, for example by a water jet.
  • a second wash tank 40 or 140 the dirt particles or sludge are separated from the bulk material by the filter 43 or 143.
  • the slide 9 or 109 is open, the bulk material cleaned in this way reaches the container 6 or 106 provided with a sieve 7 or 107 and is correspondingly dried therein.
  • the bulk material is fed from the container 6 or 106 via the line 14 or 114 to the pipeline system 240 which is operatively connected to the distributor element 235.
  • the bulk material is transported in the direction of the arrow 220 'and the material is optimally heated.
  • the bulk material flowing through the pipe system 240 as it trickles is directed into the chamber 26 and the air flow from the fan 225 acts thereon, whereby the remaining gases and fine particles are removed from the sand.
  • the remaining gases and fine particles are fed from the fan 225 via the filter device 222 and via the return line 227 in the direction of the arrow 227 'for complete combustion of the combustion chamber 221'.
  • the cleaned material that has fallen into the chamber 224 can be fed to a container 230 via a line 229 in the direction of the arrow 229 ′ and then used as largely new material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Processing Of Solid Wastes (AREA)
  • Drying Of Solid Materials (AREA)
  • Cleaning By Liquid Or Steam (AREA)
EP91115504A 1991-08-15 1991-09-13 Verfahren und Einrichtung zum Aufbereiten von Schüttgütern Withdrawn EP0528070A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2412/91 1991-08-15
CH02412/91A CH688434A5 (de) 1991-08-15 1991-08-15 Verfahren und Einrichtung zum Aufbereiten von Schuettguetern.

Publications (1)

Publication Number Publication Date
EP0528070A1 true EP0528070A1 (de) 1993-02-24

Family

ID=4233199

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91115504A Withdrawn EP0528070A1 (de) 1991-08-15 1991-09-13 Verfahren und Einrichtung zum Aufbereiten von Schüttgütern

Country Status (15)

Country Link
EP (1) EP0528070A1 (ko)
JP (1) JPH0550178A (ko)
KR (1) KR930003999A (ko)
CN (1) CN1069433A (ko)
AU (1) AU8489991A (ko)
BR (1) BR9104696A (ko)
CA (1) CA2054410A1 (ko)
CH (1) CH688434A5 (ko)
CZ (1) CZ291191A3 (ko)
FI (1) FI914455A (ko)
HU (1) HUT64491A (ko)
MX (1) MX9101486A (ko)
NO (1) NO913662L (ko)
PL (1) PL291777A1 (ko)
PT (1) PT99046A (ko)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995004600A1 (fr) * 1993-08-11 1995-02-16 Transbiotech Procede de lavage de materiaux granulaires et/ou particulaires
WO1998025704A1 (en) * 1996-12-11 1998-06-18 Earth Sciences Limited Methods and apparatus for use in processing and treating particulate material
DE102009029702A1 (de) * 2009-06-20 2011-05-26 Srs Deponiebau Gmbh Verfahren zum Reinigen von körnigem Bodenmaterial
DE102012011384A1 (de) * 2012-06-11 2013-12-12 DEANTEC GmbH Vorrichtung zum Regenerieren anorganisch gebundener Gießereisande
CN109848101A (zh) * 2018-12-03 2019-06-07 王亚萍 一种集成电路加工清洁设备
CN112264373A (zh) * 2020-09-30 2021-01-26 云南白药集团文山七花有限责任公司 一种三七自动加工生产线
CN117383277A (zh) * 2023-10-13 2024-01-12 无锡裕鑫晟材料科技有限公司 一种纳米二氧化钛粉体制备用送料机

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE368528T1 (de) * 1999-08-30 2007-08-15 Biogenesis Entpr Inc Vorrichtung und verfahren zum entfernen von verunreinigungen aus fein gemahlener erde, schlick und ton
WO2010052872A1 (ja) * 2008-11-05 2010-05-14 三井・デュポンポリケミカル株式会社 樹脂ペレットの洗浄方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008856A (en) * 1975-09-17 1977-02-22 Sears Edward A Reclaiming system for foundry sand
FR2338745A1 (fr) * 1976-01-22 1977-08-19 Nemours Cie Fse Silices Sables Procede et dispositif de purification de mineraux et notamment de sable par action de faisceaux d'ondes ultra-sonores
DE3728201A1 (de) * 1987-08-24 1989-03-09 Siemens Ag Bodenreinigungsverfahren und einrichtung zu seiner durchfuehrung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008856A (en) * 1975-09-17 1977-02-22 Sears Edward A Reclaiming system for foundry sand
FR2338745A1 (fr) * 1976-01-22 1977-08-19 Nemours Cie Fse Silices Sables Procede et dispositif de purification de mineraux et notamment de sable par action de faisceaux d'ondes ultra-sonores
DE3728201A1 (de) * 1987-08-24 1989-03-09 Siemens Ag Bodenreinigungsverfahren und einrichtung zu seiner durchfuehrung

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
AUFBEREITUNGS-TECHNIK Bd. 31, Nr. 12, Dezember 1990, WIESBADEN, DE Seiten 656 - 662 , XP00169120 GROHS 'Die Aufbereitungstechnik des Bodenwaschens' *
TECHNISCHE RUNDSCHAU Bd. 83, Nr. 10, 8. März 1991, ERN, CH , XP220492 GÄHLER GIESSEREIANLAGEN, WIL 'Regenerierung von Giesserei-Altsanden' *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995004600A1 (fr) * 1993-08-11 1995-02-16 Transbiotech Procede de lavage de materiaux granulaires et/ou particulaires
FR2708873A1 (fr) * 1993-08-11 1995-02-17 Transbiotech Procédé de lavage de matériaux granulaires et/ou particulaires.
WO1998025704A1 (en) * 1996-12-11 1998-06-18 Earth Sciences Limited Methods and apparatus for use in processing and treating particulate material
GB2320245B (en) * 1996-12-11 2000-11-08 John Henry Watt Methods and apparatus for use in processing and treating particulate material
US6269952B1 (en) 1996-12-11 2001-08-07 Earth Sciences Limited Methods and apparatus for use in processing and treating particulate material
DE102009029702A1 (de) * 2009-06-20 2011-05-26 Srs Deponiebau Gmbh Verfahren zum Reinigen von körnigem Bodenmaterial
DE102012011384A1 (de) * 2012-06-11 2013-12-12 DEANTEC GmbH Vorrichtung zum Regenerieren anorganisch gebundener Gießereisande
CN109848101A (zh) * 2018-12-03 2019-06-07 王亚萍 一种集成电路加工清洁设备
CN112264373A (zh) * 2020-09-30 2021-01-26 云南白药集团文山七花有限责任公司 一种三七自动加工生产线
CN117383277A (zh) * 2023-10-13 2024-01-12 无锡裕鑫晟材料科技有限公司 一种纳米二氧化钛粉体制备用送料机
CN117383277B (zh) * 2023-10-13 2024-04-02 无锡裕鑫晟材料科技有限公司 一种纳米二氧化钛粉体制备用送料机

Also Published As

Publication number Publication date
BR9104696A (pt) 1993-03-30
HUT64491A (en) 1994-01-28
JPH0550178A (ja) 1993-03-02
PT99046A (pt) 1993-10-29
PL291777A1 (en) 1993-03-08
NO913662L (no) 1993-02-16
HU913085D0 (en) 1992-01-28
CH688434A5 (de) 1997-09-30
AU8489991A (en) 1993-02-18
FI914455A (fi) 1993-02-16
CZ291191A3 (en) 1993-02-17
CN1069433A (zh) 1993-03-03
NO913662D0 (no) 1991-09-17
CA2054410A1 (en) 1993-02-16
KR930003999A (ko) 1993-03-22
MX9101486A (es) 1993-02-01
FI914455A0 (fi) 1991-09-23

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