EP0091424B1 - Filter belt press - Google Patents

Filter belt press Download PDF

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Publication number
EP0091424B1
EP0091424B1 EP83890041A EP83890041A EP0091424B1 EP 0091424 B1 EP0091424 B1 EP 0091424B1 EP 83890041 A EP83890041 A EP 83890041A EP 83890041 A EP83890041 A EP 83890041A EP 0091424 B1 EP0091424 B1 EP 0091424B1
Authority
EP
European Patent Office
Prior art keywords
rollers
belts
driven
roller
screen
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.)
Expired
Application number
EP83890041A
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German (de)
French (fr)
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EP0091424A2 (en
EP0091424A3 (en
Inventor
Robert Wolkenstein
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.)
Voestalpine AG
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Voestalpine 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 Voestalpine AG filed Critical Voestalpine AG
Publication of EP0091424A2 publication Critical patent/EP0091424A2/en
Publication of EP0091424A3 publication Critical patent/EP0091424A3/en
Application granted granted Critical
Publication of EP0091424B1 publication Critical patent/EP0091424B1/en
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/24—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using an endless pressing band

Definitions

  • the invention relates to a screen belt press, in which the material to be dewatered is pressed between two self-contained screen belts and passed over a plurality of rollers, both belts separately in the region of the side on which the dewatered material is thrown off driven rollers are guided.
  • Such a belt press can be found, for example, in DE-A-2127 974.
  • such belt presses have at least for one of the two belt a driven roller or roller which is arranged near the discharge end of the belt press and which acts directly on the belt.
  • a driven roller or roller which is arranged near the discharge end of the belt press and which acts directly on the belt.
  • a number of dewatering rollers or dewatering rollers in the screen belt or filter belt press that exceeds the normal level is required. If the tension caused by the belt drive in the filter belts acts on several dewatering rollers, then this tensile force in the press becomes smaller as the distance from the driven roller or roller increases due to the frictional resistance.
  • a wine press has become known from US-A-3446 139, in which elastic bands are guided over rollers and the bands are each guided together over driven rollers.
  • the belt tension is to be continuously increased by a different speed of the rollers in the direction of movement.
  • DE-A-2 431 572 shows and describes a screen belt press in which the material to be dewatered is pressed between two self-contained belts and pressed over a plurality of rollers, the belts being guided at ends on the discharge side via separately driven rollers and for one effective drainage the belts are driven at different speeds.
  • the invention now aims to equalize the tensile stress in the belt or filter belt press and thus to improve the dewatering performance of the belt press.
  • the invention consists in the fact that both belts are formed by sieve belts, that in addition in the area in which the sieve belts are guided together over rollers, at least one roller is driven, that at least one of the driven rollers over which the two Sieve belts are guided together, in the central region of the group of those rollers over which the two sieve belts are guided together, and that the driven rollers are separated by at least one non-driven roller.
  • the belt tension caused by the drive can be evened out, that is to say the tension drop that would otherwise occur be avoided or discontinued in the first part.
  • the circumference of the additionally driven roller which is preferably arranged in the middle, interacts with a screen or filter belt, which is driven again at the discharge end.
  • the screen belt located outside and not directly affected by this additionally driven roller or roller can likewise be driven directly by a further driven roller or roller arranged in the central region of the screen belt press, as a result of which the belt tension can be further evened out.
  • At least two driven rollers or rollers each have a separate and controllable drive.
  • This design makes it possible to slightly change the peripheral speed of the second driven roller or roller compared to the first driven roller or roller, so that between the an increased pressure and thus more intensive drainage can be set for both driven rollers.
  • the driven rollers are driven to a synchronous peripheral speed, which z. B. by adjustable geared motors and advantageously using the torque-dependent speed elasticity of electric motors is possible.
  • the screen or filter belt press is designated 1.
  • two screen or filter belts 2, 3 are guided in a closed circuit and tensioning rollers 4 are provided for setting the correct belt tension.
  • the screen or filter belts 2, 3 are brought together in front of a first dewatering drum 5, the material to be dewatered being introduced into the gap between the two screen or filter belts 2 and 3.
  • the two sieve or filter belts 2, 3 are then guided over dewatering rollers 6 and 7.
  • the deflection rollers for the sieve or filter belts are designated 8.
  • a deflection roller 8 via which the respective sieve belt is guided separately from the other sieve belt, is equipped with a drive 10 for each sieve belt 2 or 3.
  • Another drive roller interacts with the screen or filter belt 2.
  • the drive 9, 10 (not shown in its details) for the drive rollers can be regulated and adjusted.
  • a dewatering roller 7 which interacts with the other screen or filter belt 3, can be provided with a drive in an analogous manner.
  • the other sieve belt 3 is provided with a drive at least by a deflecting roller 8 in the area in which this sieve belt runs back separately.
  • control rollers With 11 control rollers are designated, with which the course of the tape can be checked.
  • the driven rollers with the drives 9 and 10 are driven to convey a synchronous belt speed, for example, by controllable geared motors, not shown.
  • a slight delay in the peripheral speed of the driven roller 10 leads to an increase in the contact pressure in the region of the intermediate dewatering rollers 6 and can bring about an additional improvement in the dewatering effect.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filtration Of Liquid (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Eye Examination Apparatus (AREA)
  • Liquid Crystal (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Press Drives And Press Lines (AREA)

Abstract

A sieve belt press includes two endless sieve belts which pass over a number of rolls. In the area in which the two sieve belts return separately, drive rolls are provided so that each sieve belt is driven separately. In addition, at least one further drive roll is provided in an area within which the sieve belts are passed in common over such further drive roll.

Description

Die Erfindung bezieht sich auf eine Siebbandpresse, bei welcher das zu entwässernde Material zwischen zwei in sich geschlossenen Siebbändern gepreßt und über eine Mehrzahl von Rollen oder Walzen geführt wird, wobei beide Bänder gesondert im Bereich der Seite, an welcher das entwässerte Material abgeworfen wird, über angetriebene Walzen geführt sind.The invention relates to a screen belt press, in which the material to be dewatered is pressed between two self-contained screen belts and passed over a plurality of rollers, both belts separately in the region of the side on which the dewatered material is thrown off driven rollers are guided.

Eine derartige Siebbandpresse ist beispielsweise der DE-A-2127 974 zu entnehmen. Bei derartigen Siebbandpressen ist es auch bekannt, das zu entwässernde Material zunächst in einer Seib- und danach in einer Keilzone, in welcher die beiden Siebbänder konvergierend zueinander geführt sind, vorzuentwässern und über Entwässerungstrommeln zu führen, wobei in der Regel die erste Entwässerungstrommel den Durchtritt des Wassers nicht nur durch das äußere der beiden Siebbänder, sondern auch durch das innere der beiden Siebbänder gestattet. Es ist weiters bekannt, an eine derartige Siebbandpresse eine weitere Stufe anzuschließen, bei welcher die beiden Siebbänder unter häufiger Umlenkung ihrer Bewegungsrichtung einem eventuell erhähten Preßdruck gegeneinander ausgesetzt sind. Üblicherweise weisen derartige Siebbandpressen wenigstens für eines der beiden Siebbänder eine nahe dem Abwurfende der Siebbandpresse angeordnete angetriebene Walze oder Rolle auf, welche unmittelbar auf das Siebband einwirkt. Insbesondere bei schlecht entwässerbaren Schlämmen oder auch höheren Forderungen an den Entwässerungsgrad ist eine über das normale Maß hinausgehende Anzahl von Entwässerungsrollen bzw. Entwässerungswalzen in der Siebbandoder Filterbandpresse erforderlich. Wenn nun die durch den Bandantrieb bewirkte Zugspannung in den Filterbändern auf mehrere Entwässerungsrollen wirkt, dann wird durch den Reibungswiderstand diese Zugkraft in der Presse mit zunehmendem Abstand von der angetriebenen Walze oder Rolle geringer.Such a belt press can be found, for example, in DE-A-2127 974. In such belt presses, it is also known to pre-dewater the material to be dewatered first in a sealing zone and then in a wedge zone in which the two sieve belts are converged to one another and to guide them over dewatering drums, the first dewatering drum generally passing through Water is permitted not only through the outer of the two sieve belts, but also through the inner of the two sieve belts. It is also known to connect a further stage to a screen belt press of this type, in which the two screen belts are subjected to a possibly increased pressing pressure against one another with frequent deflection of their direction of movement. Typically, such belt presses have at least for one of the two belt a driven roller or roller which is arranged near the discharge end of the belt press and which acts directly on the belt. Especially in the case of sludge that is difficult to dewater or where there are higher demands on the degree of dewatering, a number of dewatering rollers or dewatering rollers in the screen belt or filter belt press that exceeds the normal level is required. If the tension caused by the belt drive in the filter belts acts on several dewatering rollers, then this tensile force in the press becomes smaller as the distance from the driven roller or roller increases due to the frictional resistance.

Aus der US-A-3446 139 ist eine Weinpresse bekanntgeworden, bei welcher elastische Bänder über Rollen geführt werden und die Bänder jeweils gemeinsam über angetriebene Rollen geführt werden. Durch einen speziellen Antrieb soll die Bandspannung durch eine unterschiedliche Geschwindigkeit der Rollen in Bewegungsrichtung kontinuierlich gesteigert werden. Die DE-A-2 431 572 zeigt und beschreibt eine Siebbandpresse, bei der das zu entwässernde Material zwischen zwei in sich geschlossenen Bändern gepreßt über eine Mehrzahl von Walzen geführt ist, wobei die Bänder an abwurfseitigen Enden über getrennt angetriebene Rollen geführt sind und für eine wirkungsvolle Entwässerung die Bänder mit unterschliedlichen Geschwindigkeiten angetrieben werden.A wine press has become known from US-A-3446 139, in which elastic bands are guided over rollers and the bands are each guided together over driven rollers. By means of a special drive, the belt tension is to be continuously increased by a different speed of the rollers in the direction of movement. DE-A-2 431 572 shows and describes a screen belt press in which the material to be dewatered is pressed between two self-contained belts and pressed over a plurality of rollers, the belts being guided at ends on the discharge side via separately driven rollers and for one effective drainage the belts are driven at different speeds.

Die Erfindung zielt nun darauf ab, die Zugspannung in der Siebband- oder Filterbandpresse zu vergleichmäßigen und damit die Entwässerungsleistung der Siebbandpresse zu verbessern. Zur Läsung dieser Aufgabe besteht die Erfindung darin, daß beide Bänder von Siebbändern gebildet sind, daß zusätzlich in dem Bereich, in welchem die Siebbänder gemeinsam über Walzen geführt sind, wenigstens eine Walze angetrieben ist, daß wenigstens eine der angetriebenen Walzen, über welche die beiden Siebbänder gemeinsam geführt sind, im mittleren Bereich der Gruppe derjenigen Walzen, über welche die beiden Siebbänder gemeinsam geführt sind, liegt und daß die angetriebenen Walzen durch wenigstens eine nicht angetriebene Walze getrennt sind. Überraschenderweise hat sich hiebei herausgestellt, daß der Entwässerungsgrad, insbesondere bei schlecht entwässerbaren Schlämmen, auf diese Weise wesentlich erhöht werden kann. Durch die Ausbildung, daß eine angetriebene Walze oder Rolle wie in konventioneller Weise nahe dem Abwurfende der Bandpresse angeordnet ist und die zusätzliche Antriebsrolle oder -walze etwa in der Mitte der Entwässerungsrollenreihe angebracht ist, kann die antriebsbedingte Bandspannung vergleichmäßigt, das heißt, der sonst eintretende Zugspannungsabfall im ersten Teil vermieden bzw. eingestellt werden. Die bevorzugt im mittleren Bereich angeordnete zusätzlich angetriebene Walze wirkt an ihrem Umfang mit einem Sieb- oder Filterband zusammen, welches am abwurfseitigen Ende nochmals angetrieben wird. Das außen liegende und nicht unmittelbar von dieser zusätzlich angetriebenen Walze oder Rolle erfaßte Siebband kann gleichfalls durch eine weitere, im mittleren Bereich der Siebbandpresse angeordnete angetriebene Rolle oder Walze unmittelbar angetrieben werden, wodurch sich die Bandspannung weiter vergleichmäßigen läßt. Durch die Anordnung einer nicht angetriebenen Walze zwischen den angetriebenen Walzen wird die Wirkung weiter erhöht.The invention now aims to equalize the tensile stress in the belt or filter belt press and thus to improve the dewatering performance of the belt press. To achieve this object, the invention consists in the fact that both belts are formed by sieve belts, that in addition in the area in which the sieve belts are guided together over rollers, at least one roller is driven, that at least one of the driven rollers over which the two Sieve belts are guided together, in the central region of the group of those rollers over which the two sieve belts are guided together, and that the driven rollers are separated by at least one non-driven roller. Surprisingly, it has been found that the degree of dewatering, particularly in the case of sludge which is difficult to dewater, can be significantly increased in this way. Due to the design that a driven roller or roller is arranged in a conventional manner near the discharge end of the belt press and the additional drive roller or roller is attached approximately in the middle of the dewatering roller row, the belt tension caused by the drive can be evened out, that is to say the tension drop that would otherwise occur be avoided or discontinued in the first part. The circumference of the additionally driven roller, which is preferably arranged in the middle, interacts with a screen or filter belt, which is driven again at the discharge end. The screen belt located outside and not directly affected by this additionally driven roller or roller can likewise be driven directly by a further driven roller or roller arranged in the central region of the screen belt press, as a result of which the belt tension can be further evened out. By arranging a non-driven roller between the driven rollers, the effect is further increased.

Es wurde durch den Antrieb der weiteren, von beiden Siebbändern umschlungenen Walze oder Rolle, welche von der ein gesondert rücklaufendes Siebband antreibenden Walze oder Rolle durch wenigstens eine nicht angetriebene Rolle oder Walze getrennt ist, eine Verbesserung der Entwässerungsleistung von 32 % Restfeuchte auf 27 Restfeuchte gemessen.An improvement in the dewatering performance from 32% residual moisture to 27 residual moisture was measured by the drive of the further roller or roller which is wrapped by both sieve belts and which is separated from the roller or roller driving a separately returning sieve belt by at least one non-driven roller or roller .

Es entspricht einer bevorzugten Ausgestaltung des Erfindungsgegenstandes, daß wenigstens zwei angetriebene Rollen oder Walzen einen jeweils gesonderten und regelbaren Antrieb aufweisen. Diese Ausbildung ermäglicht es, neben der generellen Bandgeschwindigkeitsregelung die Umfangsgeschwindigkeit der zweiten angetriebenen Walze oder Rolle gegenüber der ersten angetriebenen Walze oder Rolle geringfügig zu verändern, so daß zwischen den beiden angetriebenen Rollen ein erhöhter Preßdruck und damit eine intensivere Entwässerung eingestellt werden kann. Üblicherweise werden die angetriebenen Rollen jedoch zu einer synchronen Umfangsgeschwindigkeit angetrieben, was z. B. durch regelbare Getriebemotoren und vorteilhaft unter Ausnützung der drehmomentabhängigen Geschwindigkeitselastizität von Elektromotoren möglich ist.It corresponds to a preferred embodiment of the subject matter of the invention that at least two driven rollers or rollers each have a separate and controllable drive. This design makes it possible to slightly change the peripheral speed of the second driven roller or roller compared to the first driven roller or roller, so that between the an increased pressure and thus more intensive drainage can be set for both driven rollers. Usually, however, the driven rollers are driven to a synchronous peripheral speed, which z. B. by adjustable geared motors and advantageously using the torque-dependent speed elasticity of electric motors is possible.

Die Erfindung wird nachfolgend an Hand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert.The invention is explained in more detail below with reference to an embodiment shown in the drawing.

In der Zeichnung ist die Sieb- oder Filterbandpresse mit 1 bezeichnet. Innerhalb dieser Sieb- oder Filterbandpresse werden zwei Sieb- oder Filterbänder 2, 3 im geschlossenen Kreislauf geführt und es sind Spannrollen 4 für die Einstellung der korrekten Bandspannung vorgesehen. Die Sieboder Filterbänder 2, 3 werden vor einer ersten Entwässerungstrommel 5 zusammengeführt, wobei das zu entwässernde Material in den Spalt zwischen den beiden Sieboder Filterbändern 2 und 3 eingebracht wird. Die beiden Sieb - oder Filterbänder 2, 3 werden in der Folge über Entwässerungsrollen 6 und 7 geführt. Die Umlenkrollen für die Sieb- oder Filterbänder sind mit 8 bezeichnet. Am abwurfseitigen Ende ist für jedes Siebband 2 bzw. 3 eine Umlenkrolle 8, über welche das jeweilige Siebband gesondert vom jeweils anderen Siebband geführt ist, mit einem Antrieb 10 ausgestattet. Mit dem Sieboder Filterband 2 wirkt eine weitere Antriebsrolle, deren Antrieb mit 9 bezeichnet ist, zusammen. Der in seinen Einzelheiten nicht dargestellte Antrieb 9,10 für die Antriebsrollen ist regelbar und einstellbar. Zusätzlich zu den Umlenkrollen 8, welche einen Antrieb 10 aufweisen, und der weiteren Antriebsrolle mit dem Antrieb 9 kann auch eine Entwässerungsrolle 7, welche mit dem anderen Sieb- oder Filterband 3 zusammenwirkt, in analoger Weise mit einem Antrieb versehen werden. In jedem Fall ist das andere Siebband 3 zumindest durch eine Umlenkrolle 8 in demjenigen Bereich, in welchem dieses Siebband gesondert rückläuft, mit einem Antrieb versehen.In the drawing, the screen or filter belt press is designated 1. Within this screen or filter belt press, two screen or filter belts 2, 3 are guided in a closed circuit and tensioning rollers 4 are provided for setting the correct belt tension. The screen or filter belts 2, 3 are brought together in front of a first dewatering drum 5, the material to be dewatered being introduced into the gap between the two screen or filter belts 2 and 3. The two sieve or filter belts 2, 3 are then guided over dewatering rollers 6 and 7. The deflection rollers for the sieve or filter belts are designated 8. At the discharge end, a deflection roller 8, via which the respective sieve belt is guided separately from the other sieve belt, is equipped with a drive 10 for each sieve belt 2 or 3. Another drive roller, the drive of which is designated by 9, interacts with the screen or filter belt 2. The drive 9, 10 (not shown in its details) for the drive rollers can be regulated and adjusted. In addition to the deflection rollers 8, which have a drive 10, and the further drive roller with the drive 9, a dewatering roller 7, which interacts with the other screen or filter belt 3, can be provided with a drive in an analogous manner. In any case, the other sieve belt 3 is provided with a drive at least by a deflecting roller 8 in the area in which this sieve belt runs back separately.

Mit 11 sind Steuerrollen bezeichnet, mit welchen der Bandverlauf kontrolliert werden kann.With 11 control rollers are designated, with which the course of the tape can be checked.

Die angetriebenen Rollen mit den Antrieben 9 und 10 sind zur Vermittlung einer synchronen Bandgeschwindigkeit beispielsweise durch nicht dargestellte regelbare Getriebemotoren angetrieben. Eine geringfügige Verzögerung der Umfangsgeschwindigkeit der angetriebenen Rolle 10 führt zu einer Erhöhung des Anpreßdruckes im Bereich der zwischengeschalteten Entwässerungsrollen 6 und kann eine zusätzliche Verbesserung der Entwässerungswirkung bewirken.The driven rollers with the drives 9 and 10 are driven to convey a synchronous belt speed, for example, by controllable geared motors, not shown. A slight delay in the peripheral speed of the driven roller 10 leads to an increase in the contact pressure in the region of the intermediate dewatering rollers 6 and can bring about an additional improvement in the dewatering effect.

Claims (3)

1. Filter belt press (1) in which material to be dewatered is subjected to pressure between two endless belts (2, 3) and is translated over a plurality of rollers or rolls, both belts being trained around driven rollers (8) separately in the region of the discharge side for the dewatered material, characterised in that both belts are screen belts (2, 3), that in addition in the region where the screen belts (2, 3) are cooperatively translated over rollers at least one roller (9) is driven, that at least one of the driven rollers (9) around which both screen belts (2, 3) are trained jointly is positioned in a medium region of the group of rollers (6) over which both screen belts (2, 3) are translated jointly, and that the driven rollers (8, 9) are separated by at least one idler roller.
2. Filter belt press as claimed in claim 1, characterised in that in the region in which the screen belts (2, 3) are cooperatively translated over rollers at least two rollers (7, 9) each engaged by a different screen belt (2, 3) are driven.
3. Filter belt press as claimed in claim 1 oder 2, characterised in that at least two driven rollers (7, 8, 9) each have a separate, controlled drive means.
EP83890041A 1982-04-01 1983-03-21 Filter belt press Expired EP0091424B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0130382A AT381238B (en) 1982-04-01 1982-04-01 SCREEN PRESS
AT1303/82 1982-04-01

Publications (3)

Publication Number Publication Date
EP0091424A2 EP0091424A2 (en) 1983-10-12
EP0091424A3 EP0091424A3 (en) 1984-12-27
EP0091424B1 true EP0091424B1 (en) 1987-05-20

Family

ID=3510966

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83890041A Expired EP0091424B1 (en) 1982-04-01 1983-03-21 Filter belt press

Country Status (5)

Country Link
US (1) US4492155A (en)
EP (1) EP0091424B1 (en)
JP (1) JPS58181499A (en)
AT (2) AT381238B (en)
DE (1) DE3371613D1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4681033A (en) * 1984-12-11 1987-07-21 Rexnord Inc. Drive system for belt press
US4622894A (en) * 1984-12-11 1986-11-18 Rexnord Inc. Belt press load bearing measuring means
US7381329B1 (en) * 2006-11-07 2008-06-03 William Harris Moss Belt press apparatus and method for high solids capture and high solids content
US7964105B2 (en) * 2008-08-07 2011-06-21 William Harris Moss Method for improving belt press dewatering
US9242191B2 (en) 2011-12-13 2016-01-26 Industrial Technology Research Institute Filtration dehydration apparatus

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3130667A (en) * 1962-02-13 1964-04-28 Robert J Coffelt Serpentine fruit press
US3446139A (en) * 1966-05-10 1969-05-27 Univ California Serpentine wine press
US3459123A (en) * 1966-09-15 1969-08-05 American Sugar Fruit press
US4142461A (en) * 1974-06-07 1979-03-06 Alb. Klein Kg Device for dewatering sludge and other material containing water and solid particles
DE2431572A1 (en) * 1974-07-01 1976-01-22 Nordstjernan Rederi Ab Water sepn from a slurry by rotary pressure - by passage between permeable belts moving at different speeds
DE2506173A1 (en) * 1975-02-14 1976-08-26 Albert Baehr FILTER PRESS, IN PARTICULAR FOR DEWATERING OF SLUDGE IN SEWAGE TREATMENT PLANTS, PREFERABLY BELT FILTER PRESS
US4181616A (en) * 1975-11-17 1980-01-01 Albert Bahr Device for dewatering sludge or the like
GB1519234A (en) * 1976-05-05 1978-07-26 Hartley Simon Ltd Filter presses
JPS55126592A (en) * 1979-03-20 1980-09-30 Tooru Seki Manufacture of coallcontained sludge pellet useful for fertilizer and fuel

Also Published As

Publication number Publication date
JPS58181499A (en) 1983-10-24
US4492155A (en) 1985-01-08
EP0091424A2 (en) 1983-10-12
AT381238B (en) 1986-09-10
ATA130382A (en) 1986-02-15
DE3371613D1 (en) 1987-06-25
EP0091424A3 (en) 1984-12-27
ATE27245T1 (en) 1987-06-15

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