EP0290550A1 - Device for aerating fluids, in particular during flotation - Google Patents

Device for aerating fluids, in particular during flotation

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Publication number
EP0290550A1
EP0290550A1 EP87907753A EP87907753A EP0290550A1 EP 0290550 A1 EP0290550 A1 EP 0290550A1 EP 87907753 A EP87907753 A EP 87907753A EP 87907753 A EP87907753 A EP 87907753A EP 0290550 A1 EP0290550 A1 EP 0290550A1
Authority
EP
European Patent Office
Prior art keywords
section
mixing
housing
air
annular channel
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Withdrawn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
EP87907753A
Other languages
German (de)
French (fr)
Inventor
Andreas Jungmann
Ulrich Reilard
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.)
Allmineral Aufbereitungstechnik GmbH and Co KG
Original Assignee
Allmineral Aufbereitungstechnik GmbH and Co KG
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 Allmineral Aufbereitungstechnik GmbH and Co KG filed Critical Allmineral Aufbereitungstechnik GmbH and Co KG
Publication of EP0290550A1 publication Critical patent/EP0290550A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/24—Pneumatic
    • B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3121—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/75—Flowing liquid aspirates gas

Definitions

  • the invention relates to a device for aerating liquids, in particular for flotation, designed as a ring injector, in the of which
  • Liquid flowing through the housing is arranged a central piece, which forms an annular channel with the housing, the annular channel having its smallest cross-section at the level of the air outlet openings in the housing wall and in
  • Liquid flow direction following the ring channel constriction an abrupt cross-sectional enlargement of the ring channel is made before, to which the mixing and dispersing section adjoins the housing outlet.
  • Devices of this type are known and are u.a. used in flotation to separate the solids contained in a slurry.
  • the poorly wettable solid particles accumulate on air bubbles that are generated in such devices, also called fumigators, injectors or reactors.
  • the solids attached to the air bubbles are generally discharged over the edge of the separation or flotation vessel.
  • the aim is to keep the size of the air bubbles as small as possible, because this will facilitate the attachment of solid particles during flotation.
  • Air is supplied to the ring injector via air supply channels in the mixing section.
  • the annular gap that forms in the ring injector is thereby ventilated inside and outside.
  • the mixing section and the center piece, which is located centrally within the mixing and train section, are stepped, whereby the air is sucked into the inside and outside of the dispersion jet that forms, similar to a water jet pump.
  • the object of the invention is to improve devices of the prior art in such a way that the specific energy consumption is reduced and the degree of selectivity is increased.
  • This device is said to be particularly suitable for the flotation of coal and other processing materials.
  • the ventilation device according to the preamble of the main claim has a gap width when the slurry enters the ventilation space, which leads to a minimum clouding speed V 1 of 2.0 m / s.
  • the center piece of the device extends to the housing outlet and the diameter is constant.
  • the annular channel has the same cross-section from the sudden expansion to the housing outlet and the length of the mixing and Dispersion distance is more than 20 times the annular gap width of the ring channel.
  • distribution cones of different diameters of the base of the straight circular cone and / or cones with different angles between the base and the side line of the circular cone i.e. be used with an increased or reduced slope.
  • the turbidity distribution can be influenced with the angle of the slope of the cone.
  • the strips arranged on the middle piece and / or in the upper part of the housing serve to center the middle piece within the mixing and Dispersion line.
  • Such strips can also be designed helically, and it has been shown that a swirl flow is superimposed on the axial flow of the cloudy-air mixture, which has an advantageous effect on the attachment of the solid particles to the air bubbles.
  • the centering part can be centered by arranging, for example, centering pins which hold the middle part in the upper housing part.
  • Table 1 shows the test conditions and test results which were achieved with ring injectors according to the invention of types 1 to 3. In the flotation tests on a semi-industrial scale, flotation sludge from a hard coal wash was used as the feed.
  • the ventilation device shown in the cross-sectional view consists of a multi-part housing.
  • the lower housing part (3) has a connecting flange (1) to which the slurry pipe (not shown) is connected.
  • the arrow indicates the direction of flow of the slurry.
  • the inlet diameter of the ventilation device is denoted by (0).
  • a housing section adjoins the lower housing part (3), in which the air chamber (4) is located with the ring-shaped air outlet opening.
  • the ventilation medium flows to the air chamber (4) via an air line (not shown).
  • the gap width of the air outlet openings in the annular gap of the air chamber (4) can be changed by interposing spacer rings (13).
  • the upper housing part (7) is arranged above the lower housing part (3) with air chamber (4).
  • the flange (5) is used to attach the ventilation device within a line to the (not shown) separation vessel or when the
  • Ventilation device outside the separation vessel as a line connection to the separation vessel.
  • the core which consists of a distribution cone (2) and the center piece (10), is located within the housing of the ventilation device. Distribution cone and center piece can be screwed or plugged together. The The separation point is located at the transition from the reduction of the cross-section of the distribution cone to the central part of the same diameter.
  • the center piece (10) has a constant diameter over its entire length up to the housing outlet (12).
  • the mixing and dispersing section (6) with a length L 1 and a constant gap width (Q 3 ) connects to the housing outlet (12).
  • a screw-shaped bar (8) is indicated on the middle piece (10) and is intended to center the middle piece in the upper housing part (7) and to generate a swirl flow of the cloudy-air mixture.
  • a holding device (9) in the form of an adjustable pin is located on the upper housing part (7) below the housing outlet (12).

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Physical Water Treatments (AREA)

Abstract

Injecteurs annulaires d'aération de fluides, utilisables par exemple en installations de flottation, comprennent un logement avec une section de mélange, dans laquelle de l'air est amené à travers une fente annulaire au fluide qui s'y écoule. Un noyau est agencé au centre de la section de mélange. Dans la section de mélange, un mélange air-solides se forme par déposition de bulles d'air sur des particules solides. Un injecteur annulaire comprend une fente d'une largeur (Q2) telle qu'une vitesse minimum de turbidité égale à 2,0 m/s à l'entrée de la chambre d'aération est atteinte, une section annexe de mélange et de dispersion (6) ayant une section transversale constante jusqu'à la fin (12), et une pièce centrale (10) agencée au centre de celle-ci et ayant elle aussi une section transversale constante, la longueur de la section de mélange et de dispersion (6) étant 20 fois supérieure à la largeur (Q3) de la fente annulaire. Un cône de distribution (92) et la pièce centrale (10) peuvent être vissés ensemble ou insérés l'un dans l'autre. La fente d'air peut être réglée par des bagues d'écartement (13). Des barres en spirale (8) agencées dans la section de mélange et de dispersion (6) permettent d'y générer un tourbillon. On a testé le dispositif d'aération pour la flottation de boues de charbon minéral.Annular fluid aeration injectors, usable for example in flotation installations, comprise a housing with a mixing section, in which air is supplied through an annular slot to the fluid flowing therein. A core is arranged in the center of the mixing section. In the mixing section, an air-solids mixture is formed by depositing air bubbles on solid particles. An annular injector comprises a slit with a width (Q2) such that a minimum turbidity speed equal to 2.0 m / s at the inlet of the aeration chamber is reached, an annex section of mixing and dispersion (6) having a constant cross section until the end (12), and a central piece (10) arranged in the center thereof and also having a constant cross section, the length of the mixing and dispersing section (6) being 20 times greater than the width (Q3) of the annular slot. A dispensing cone (92) and the center piece (10) can be screwed together or inserted into each other. The air gap can be adjusted by distance rings (13). Spiral bars (8) arranged in the mixing and dispersing section (6) are used to generate a vortex there. The aeration device was tested for flotation of mineral coal sludge.

Description

Vorrichtung zum Belüften von Flüssigkeiten, insbesondere für eine Flotation Device for aerating liquids, in particular for flotation
Die Erfindung betrifft eine Vorrichtung zum Belüften von Flüssigkeiten, insbesondere für eine Flotation, ausgebildet als Ringinjektor, in dessen von derThe invention relates to a device for aerating liquids, in particular for flotation, designed as a ring injector, in the of which
Flüssigkeit durchströmten Gehäuse ein Mittelstück angeordnet ist, das mit dem Gehäuse einen Ringkanal bildet, wobei der Ringkanal in Höhe der Luftaustrittsöffnungen in der Gehäusewandung seinen geringsten Querschnitt aufweist und inLiquid flowing through the housing is arranged a central piece, which forms an annular channel with the housing, the annular channel having its smallest cross-section at the level of the air outlet openings in the housing wall and in
Flüssigkeitsströmungsrichtung im Anschluß an die Ringkanal-Engstelle eine schlagartige Querschnittsvergrößerung des Ringkanals vor genommen ist, an die sich die Misch- und Dispergierstrecke zum Gehäuseausgang anschließt.Liquid flow direction following the ring channel constriction an abrupt cross-sectional enlargement of the ring channel is made before, to which the mixing and dispersing section adjoins the housing outlet.
Vorrichtungen dieser Art sind bekannt und werden u.a. bei der Flotation angewendet, um die in einer Trübe enthaltenen Feststoffe voneinander zu trennen. Die schlechter zu benetzenden Feststoffpartikel lagern sich an Luftbläschen an, die in derartigen Vorrichtungen, auch Begaser, Injektoren oder Reaktoren genannt, erzeugt werden. Die an den Luftbläschen angelagerten Feststoffe werden in der Regel über den Rand des Trenn- oder Flotationsgefäßes ausgetragen.Devices of this type are known and are u.a. used in flotation to separate the solids contained in a slurry. The poorly wettable solid particles accumulate on air bubbles that are generated in such devices, also called fumigators, injectors or reactors. The solids attached to the air bubbles are generally discharged over the edge of the separation or flotation vessel.
Bei allen Belüftungsvorrichtungen dieser Gattung strebt man-an, die Größe der Luftbläscheπ möglichst gering zu halten, weil dadurch bei der Flotation die Anlagerung von Feststoffpartikeln erleichtert wird.In all aeration devices of this type, the aim is to keep the size of the air bubbles as small as possible, because this will facilitate the attachment of solid particles during flotation.
Eine Vorrichtung zur Vermischung von Gasen und Flüssigkeiten wurde bereits vor 50 Jahren in der US-PS 1 , 810 , 131 beschrieben . Diese Vorrichtung zeigt Merkmale einer Belüftungseinrichtung, wie sie beispielsweise später (DE-OS 34 12 431) als Vorrichtung zum Belüften von Dispersionen, insbesondere als Flotationsvorrichtung zum Deinken von Faserstoffsuspersionen mit Ringinjektor, bekannt geworden ist.A device for mixing gases and liquids was already described 50 years ago in US Pat. No. 1,810,131. This device shows features of a ventilation device as it For example, later (DE-OS 34 12 431) has become known as a device for aerating dispersions, in particular as a flotation device for deinking fibrous material dispersions with a ring injector.
Dem Ringinjektor wird über Luftzuführkanäle in der Mischstrecke Luft zugeführt. Der sich im Ringinjektor bildende ringförmige Spalt wird dadurch innen und außen belüftet. Die Mischstrecke und das Mittelstück, das sich zentrisch innerhalb der Misch- und Zugstrecke befindet, sind stufenförmig abgesetzt, wodurch die Luft analog einer Wasserstrahlpumpe in den innen- und den Außenbereich des sich bildenden Dispersionsstrahles eingesaugt wird.Air is supplied to the ring injector via air supply channels in the mixing section. The annular gap that forms in the ring injector is thereby ventilated inside and outside. The mixing section and the center piece, which is located centrally within the mixing and train section, are stepped, whereby the air is sucked into the inside and outside of the dispersion jet that forms, similar to a water jet pump.
Aufgabe der Erfindung ist es, Vorrichtungen des Standes der Technik dahingehend zu verbessern, daß der spezifische Energieverbrauch reduziert und der Grad der Selektivität erhöht wird.The object of the invention is to improve devices of the prior art in such a way that the specific energy consumption is reduced and the degree of selectivity is increased.
Diese Vorrichtung soll insbesondere für die Flotation von Kohle und sonstigen Aufbereitungsstoffen geeignet sein.This device is said to be particularly suitable for the flotation of coal and other processing materials.
Zur Lösung dieser Aufgabe wird erfindungsgemäß vorgeschlagen, daß die Belüftungsvorrichtung nach dem Oberbegriff des Hauptanspruchs bei Eintritt der Trübe in den Belüftungsraum eine Spaltweite aufweist, die zu einer Mindesttrübegeschwindigkeit V1 von 2,0 m/s führt. Das Mittelstück der Vorrichtung erstreckt sich bis zum Gehäuseausgang und der Durchmesser ist gleichbleibend. Der Ringkanal weist von der schlagartigen Erweiterung bis zum Gehäuseausgang den gleichen Querschnitt auf und die Länge der Misch- und Dispergierstrecke beträgt mehr als das 20fache der Ringspaltbreite des Ringkanals.To achieve this object, it is proposed according to the invention that the ventilation device according to the preamble of the main claim has a gap width when the slurry enters the ventilation space, which leads to a minimum clouding speed V 1 of 2.0 m / s. The center piece of the device extends to the housing outlet and the diameter is constant. The annular channel has the same cross-section from the sudden expansion to the housing outlet and the length of the mixing and Dispersion distance is more than 20 times the annular gap width of the ring channel.
Infolge der gleichmäßigen Geschwindigkeit im Ringkanal aufgrund des gleichbleibenden Querschnitts wird die Durchmischung von Luftbläschen und Feststoffteilchen im Verlaufe der Mischstrecke besonders begünstigt, da im Verlaufe der gesamten Mischstrecke der spezifische Energieeintrag konstant ist.Due to the uniform speed in the ring channel due to the constant cross-section, the mixing of air bubbles and solid particles is particularly favored in the course of the mixing section, since the specific energy input is constant over the course of the entire mixing section.
Versuche in einer Kohle-Flotationsanlage haben gezeigt, daß bei einer Trübegeschwindigkeit, die über 2 m/s liegt, insbesondere bei 2,0 bis 4,0 m/s das Ausbringen optimal ist.Experiments in a coal flotation plant have shown that at a turbidity rate that is above 2 m / s, the yield is optimal, in particular at 2.0 to 4.0 m / s.
Weitere konstruktive Einzelheiten sind Gegenstand der Unteransprüche.Further constructive details are the subject of the subclaims.
Die Unterteilung des Kerns der Belüftungsvorrichtung in den Verteilkegel und das Mittelstück, die zusammenschraub- oder -steckbar sind, ermöglicht es, unterschiedliche Verteilkegel und Mittelstücke zu kombinieren. Es können, je nach Anforderung, Verteilkegel verschiedenen Durchmessers der Basis des geraden Kreiskegels und/oder Kegel mit unterschiedlichen Winkeln zwischen Basis und Seitenlinie des Kreiskegels, d.h. mit vergrößerter oder verkleinerter Steigung eingesetzt werden. Durch Änderung des Basisdurchmessers des Verteilkegels wird der Ringkanalquerschnitt in Höhe der Luftaustrittsöffnungen verändert. Mit dem Winkel der Steigung des Kegels läßt sich die Trübeverteilung beeinflussen.The subdivision of the core of the ventilation device into the distribution cone and the center piece, which can be screwed or plugged together, makes it possible to combine different distribution cones and center pieces. Depending on the requirements, distribution cones of different diameters of the base of the straight circular cone and / or cones with different angles between the base and the side line of the circular cone, i.e. be used with an increased or reduced slope. By changing the base diameter of the distribution cone, the ring channel cross-section is changed at the level of the air outlet openings. The turbidity distribution can be influenced with the angle of the slope of the cone.
Die am Mittelstück und/oder im Gehäuseoberteil angeordneten Leisten dienen der Zentrierung des Mittelstückes innerhalb der Misch- und Dispergierstrecke. Derartige Leisten können auch schraubenförmig ausgeführt sein, und es hat sich gezeigt, daß hierdurch der axialen Strömung des Trübe-Luft-Gemisches eine Drallströmung überlagert wird, die sich vorteilhaft für die Anlagerung der Feststoffpartikel an die Luftbläschen auswirkt.The strips arranged on the middle piece and / or in the upper part of the housing serve to center the middle piece within the mixing and Dispersion line. Such strips can also be designed helically, and it has been shown that a swirl flow is superimposed on the axial flow of the cloudy-air mixture, which has an advantageous effect on the attachment of the solid particles to the air bubbles.
Dies gilt auch für die Ausführungsform mit schraubenförmig genutetem Mittelstück und/oder entsprechend genuteter Innenwand des Gehäuseoberteils In diesem Fall kann die Zentrierung des Mittelstückes durch die Anordnung von z.B. Zentrierstiften, die das Mittelstück im Gehäuse Oberteil halten, erfolgen. This also applies to the embodiment with a helically grooved center piece and / or correspondingly grooved inner wall of the upper housing part. In this case, the centering part can be centered by arranging, for example, centering pins which hold the middle part in the upper housing part.
Aus Tafel 1 sind die Versuchsbedingungen und Versuchsergebnisse , die mit erfindungsgemäßen Ringinj ektoren der Typen 1 bis 3 erzielt wurden, ersichtlich . Bei den Flotationsversuchen im halbtechnischen Maßstab wurde als Aufgabegut Flotationsschlamm aus einer Steinkohlenwäsche eingesetzt . Table 1 shows the test conditions and test results which were achieved with ring injectors according to the invention of types 1 to 3. In the flotation tests on a semi-industrial scale, flotation sludge from a hard coal wash was used as the feed.
Ein Ausführungsbeispiel der erfindungsgemäßen Belüftungsvorrichtung wird anhand der schematischen Zeichnung näher erläutert.An embodiment of the ventilation device according to the invention is explained in more detail with reference to the schematic drawing.
Die in der Ouerschnittsansicht dargestellte Belüftungsvorrichtung besteht aus einem mehrteiligen Gehäuse. Das Gehäuseunterteil (3) weist einen Anschlußflansch (1) auf, an den die (nicht dargestellte) Trübeleitung angeschlossen wird. Der Pfeil kennzeichnet die Fließrichtung der Trübe. Der Eingangsdurchmesser der Belüftungsvorrichtung ist mit (0 ) bezeichnet.The ventilation device shown in the cross-sectional view consists of a multi-part housing. The lower housing part (3) has a connecting flange (1) to which the slurry pipe (not shown) is connected. The arrow indicates the direction of flow of the slurry. The inlet diameter of the ventilation device is denoted by (0).
An das Gehäuseunterteil (3) schließt sich ein Gehäuseabschnitt an, in dem sich die Luftkammer (4) befindet mit der ringförmigen Luftaustrittsöffnung. Der Luftkammer (4) strömt das Belüftungsmedium über eine (nicht dargestellte) Luftleitung zu.A housing section adjoins the lower housing part (3), in which the air chamber (4) is located with the ring-shaped air outlet opening. The ventilation medium flows to the air chamber (4) via an air line (not shown).
Durch Zwischenlegen von Distanzringen (13) läßt sich die Spaltweite der Luftaustrittsoffnungen im Ringspalt der Luftkammer (4) verändern.The gap width of the air outlet openings in the annular gap of the air chamber (4) can be changed by interposing spacer rings (13).
Oberhalb des Gehäuseunterteils (3) mit Luftkammer (4) ist das Gehäuseoberteil (7) angeordnet. Der Flansch (5) dient zur Befestigung der Belüftungsvorrichtung innerhalb einer Leitung zum (nicht dargestellten) Trenngefäß oder bei Anordnung derThe upper housing part (7) is arranged above the lower housing part (3) with air chamber (4). The flange (5) is used to attach the ventilation device within a line to the (not shown) separation vessel or when the
Belüftungsvorrichtung außerhalb des Trenngefäßes als Leitungsanschluß an das Trenngefäß.Ventilation device outside the separation vessel as a line connection to the separation vessel.
Innerhalb des Gehäuses der Belüftungsvorrichtung befindet sich der Kern, der aus einem Verteilkegel (2) und dem Mittelstück (10) besteht. Verteilkegel und Mittelstück sind zusammenschraub- oder -steckbar. Die Trennstelle befindet sich an dem Übergang der Querschnittsreduzierung des Verteilkegels zum Mittelstück gleichbleibenden Durchmessers. Das Mittelstück (10) weist auf seiner ganzen Länge einen bis zum Gehäuseausgang (12) gleichbleibenden Durchmesser auf.The core, which consists of a distribution cone (2) and the center piece (10), is located within the housing of the ventilation device. Distribution cone and center piece can be screwed or plugged together. The The separation point is located at the transition from the reduction of the cross-section of the distribution cone to the central part of the same diameter. The center piece (10) has a constant diameter over its entire length up to the housing outlet (12).
In Höhe des Luftaustritts aus der Luftkammer (4) befindet sich die engste Stelle des Ringkanals für den Durchfluß der Trübe. Diese Engstelle (Q2) wird durch den größten Durchmesser des Verteilkegels (2) gebildet. Die durch die konstruktive Ausbildung des Verteilkegels (2) in seinem oberen Abschnitt entstehende schlagartige Querschnittsvergrößerung des Ringkanals zwischen Verteilkegel und Innenwand des Gehäuseoberteils verhindert trotz Aufnahme von Luft aus der Luftkammer eine Geschwindigkeitserhöhung in der Flotationstrübe.At the level of the air outlet from the air chamber (4) is the narrowest point of the ring channel for the flow of the slurry. This constriction (Q 2 ) is formed by the largest diameter of the distribution cone (2). The abrupt cross-sectional enlargement of the ring channel between the distribution cone and the inner wall of the upper part of the housing, which occurs in its upper section due to the design of the distribution cone (2), prevents an increase in speed in the flotation slurry despite the absorption of air from the air chamber.
Im Anschluß an die engste Stelle des Ringkanals schließt sich die Misch- und Dispergierstrecke (6) mit einer Länge L1 und gleichbleibender Spaltweite (Q3) bis zum Gehäuseausgang (12) an.Following the narrowest point of the ring channel, the mixing and dispersing section (6) with a length L 1 and a constant gap width (Q 3 ) connects to the housing outlet (12).
Auf dem Mittelstück (10) ist eine schraubenförmig ausgeführte Leiste (8) angedeutet, die der Zentrierung des Mittelstückes im Gehäuseoberteil (7) und der Erzeugung einer Drallströmung des Trübe-Luft-Gemisches dienen soll.A screw-shaped bar (8) is indicated on the middle piece (10) and is intended to center the middle piece in the upper housing part (7) and to generate a swirl flow of the cloudy-air mixture.
Eine Haltevorrichtung (9) in Form eines einstellbaren Stiftes befindet sich am Gehäuseoberteil (7) unterhalb des Gehäuseausgangs (12). Bezugsziffernliste:A holding device (9) in the form of an adjustable pin is located on the upper housing part (7) below the housing outlet (12). List of reference numbers:
1 Anschlußflansch an die Trübeleitung1 connection flange to the slurry pipe
2 Verteilkegel2 distribution cones
3 Gehäuseunterteil3 lower housing part
4 Luftkammer im Gehäuseunterteil4 Air chamber in the lower part of the housing
5 Befestigungsflansch im oder am Trenngefäß5 mounting flange in or on the separation vessel
6 Misch- und Dispergierstrecke6 Mixing and dispersing section
7 Gehäuseoberteil7 upper housing part
8 Leiste8 bar
9 Haltevorrichtung für Mittelstück9 holding device for center piece
10 Mittelstück10 center piece
11 schlagartige Erweiterung11 sudden expansion
12 Gehäuseausgang12 housing outlet
13 Distanzring13 spacer ring
L1 Länge der Misch- und DispergierstreckeL 1 length of the mixing and dispersing section
Q1 EingangsdurchmesserQ 1 input diameter
Q2 Spaltweite der Misch- u. DispergierstreckeQ 2 gap width of the mixing and Dispersion line
(Engstelle)(Bottleneck)
Q3 Ringspaltbreite der Misch- und Dispergierstrecke Q 3 Annular gap width of the mixing and dispersing section

Claims

Patentansprüche: Claims:
1. Vorrichtung zum Belüften von Flüssigkeiten, insbesondere für eine Flotation, ausgebildet als Ringinjektor, in dessen von der Flüssigkeit durchströmten Gehäuse ein Mittelstück angeordnet ist, das mit dem Gehäuse einen Ringkanal bildet, wobei der Ringkanal in Höhe der Luftaustrittsöffnungen in der Gehäusewandung seinen geringsten Querschnitt aufweist und in Flüssigkeitsströmungsrichtung im Anschluß an die Ringkanal-Engstelle eine schlagartige Querschnittsvergrößerung des Ringkanals vorgenommen ist, an die sich die Misch- und Dispergierstrecke zum Gehäuseausgang anschließt, dadurch gekennzeichnet, daß die Belüftungsvorrichtung bei Eintritt der1. Device for aerating liquids, in particular for flotation, designed as a ring injector, in the housing through which the liquid flows, a middle piece is arranged, which forms an annular channel with the housing, the annular channel at the level of the air outlet openings in the housing wall having its smallest cross section has and in the liquid flow direction following the annular channel constriction, an abrupt cross-sectional enlargement of the annular channel is carried out, to which the mixing and dispersing section connects to the housing outlet, characterized in that the ventilation device when the
Trübe in den Belüftungsraum eine Spaltweite (Q 2) aufweist, die zu einer Mindesttrubegeschwindigkeit V1 von 2,0 m/s führt, daß die Belüftungseinrichtung ein Mittelstück (10) aufweist, das sich mit gleichbleibendem Durchmesser von der schlagartigen Erweiterung (11) bis zum Gehäuseausgang (12) erstreckt, daß der Ringkanal von der schlagartigen Erweiterung (11) bis zum Gehäuseausgang den gleichen Querschnitt aufweist und daß die Länge der Misch- und Dispergierstrecke (6) mehr als das 20fache der Ringspaltbreite (Q3) beträgt. Turbid in the ventilation space has a gap width (Q 2 ), which leads to a minimum turbidity speed V 1 of 2.0 m / s, that the ventilation device has a center piece (10), which has a constant diameter from the sudden expansion (11) to extends to the housing outlet (12), that the annular channel from the abrupt extension (11) to the housing outlet has the same cross-section and that the length of the mixing and dispersing section (6) is more than 20 times the annular gap width (Q 3 ).
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Kern der Belüftungsvorrichtung aus dem2. Device according to claim 1, characterized in that the core of the ventilation device from the
Verteilkegel (2) und dem Mittelstück (10) besteht und beide Teile zusammenschraub- oder -steckbar sind (11). Distribution cone (2) and the center piece (10) and both parts can be screwed or plugged together (11).
3. Vorrichtung nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Luftaustrittsöffnung veränderbar ist und vorzugsweise durch Zwischenlage von Distanzringen (13) zwischen Luftkammer-Gehäuseteil (4) und3. Device according to claims 1 and 2, characterized in that the air outlet opening is variable and preferably by interposing spacer rings (13) between the air chamber housing part (4) and
Gehäuseunterteil (3) einstellbar ist.Lower housing part (3) is adjustable.
4. Vorrichtung nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß die Misch- und Dispergierstrecke ( 6 ) mit mindestens einer Leiste (8) versehen ist, die gleichmäßig am Umfang verteilt, sich erstreckend von der Stelle der schlagartigen Erweiterung (11) bis zum Gehäuseausgang (11), am Mittelstück (10) und/oder im Gehäuseoberteil (7) angeordnet ist.4. Device according to claims 1 to 3, characterized in that the mixing and dispersing section (6) is provided with at least one bar (8) which is distributed uniformly around the circumference, extending from the point of the sudden expansion (11) to to the housing outlet (11), on the center piece (10) and / or in the upper housing part (7).
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Leiste (8) bzw. die Leisten schraubenförmig mit mindestens einem Schraubengang ausgeführt ist (sind).5. The device according to claim 4, characterized in that the strip (8) or the strips is designed helically with at least one screw thread (are).
6. Vorrichtung nach den Ansprüchen 4 und 5, dadurch gekennzeichnet, daß das Mittelstück (10) und/oder die Innenwand des Gehäuseoberteils (7) schraubenförmig genutet sind. 6. Device according to claims 4 and 5, characterized in that the central piece (10) and / or the inner wall of the upper housing part (7) are grooved helically.
EP87907753A 1986-11-26 1987-11-04 Device for aerating fluids, in particular during flotation Withdrawn EP0290550A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863640315 DE3640315A1 (en) 1986-11-26 1986-11-26 DEVICE FOR VENTILATING LIQUIDS, IN PARTICULAR FOR A FLOTATION
DE3640315 1986-11-26

Publications (1)

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EP0290550A1 true EP0290550A1 (en) 1988-11-17

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Application Number Title Priority Date Filing Date
EP87116227A Pending EP0269897A1 (en) 1986-11-26 1987-11-04 Device for aerating liquids, particularly for a flotation
EP87907753A Withdrawn EP0290550A1 (en) 1986-11-26 1987-11-04 Device for aerating fluids, in particular during flotation

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP87116227A Pending EP0269897A1 (en) 1986-11-26 1987-11-04 Device for aerating liquids, particularly for a flotation

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US (1) US4840753A (en)
EP (2) EP0269897A1 (en)
AU (1) AU8277987A (en)
DE (1) DE3640315A1 (en)
WO (1) WO1988003838A1 (en)
ZA (1) ZA878853B (en)

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Also Published As

Publication number Publication date
DE3640315A1 (en) 1988-06-09
EP0269897A1 (en) 1988-06-08
DE3640315C2 (en) 1989-05-11
AU8277987A (en) 1988-06-16
ZA878853B (en) 1989-01-25
WO1988003838A1 (en) 1988-06-02
US4840753A (en) 1989-06-20

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