BE493152A

BE493152A -

Info

Publication number: BE493152A
Authority: BE
Priority date: 1949-01-07
Also published as: FR1009414A

Description

       

  SEPARATION DU GAZ ET DU LIQUIDE OU DE LA SUSPENSION A PARTIR

D&#65533;UNE MOUSSE. 

  
Il existe de nombreux procédés industriels dans lesquels une mousse ou écume peut être produite soit intentionnellement (par exemple dans le flottage à mousse employé dans la concentration de minerais) ou incidemment.

  
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du gaz) . Parfois il s'agit de traiter le liquide; ou encore, le liquide peut contenir, en suspension, des matières solides finement divisées, et le gaz peut être barboté et distribué à travers la suspension afin de réagir avec les matières solides finement divisées. Parfois, le mélange est soumis à une agitation. Dans de nombreux cas de ce genre, le gaz ressort non pas sous une simple forme gazeuse, mais sous la forme d'une mousse qui doit être désagrégée. La présente invention vise à établir des procédés et des:  appareils pour désagréger de telles mousses, de sorte que le gaz puisse être évacué de son côté et que le liquide ou la suspension liquide puisse être évacuée séparément.' 

  
Dans un appareil dans lequel un liquide, seul ou contenant des matières finement divisées en suspension, est soumis à un traitement par le

  
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ment un séparateur vers lequel la mousse est dirigée et de où le gaz et le liquide (ou la suspension) sont évacués séparément. 

  
Il va de soi que, après le traitement, une proportion importante

  
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sente invention se rapporte au -problème de la mousse. 

  
Le gaz est de préférence pompé dans le liquide et réparti à travers celui-ci sous une pression suffisante non seulement pour refouler les bulles

  
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résulte, sous la pression nécessaire pour actionner le séparateur (par exemple un séparateur centrifuge). 

  
Dans la partie de l'installation où se forme la mousse, et conformément à une caractéristique de l'invention, la cuve contenant la mousse

  
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être maintenue, la partie où se forme la mousse est fermée à l'exception des entrées et des sorties indispensables, comprenant notamment la sortie vers laquelle la mousse est dirigée à travers le séparateur ou vers celui-

  
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pension, qui doivent être évacués de la cuve en plus de la mousse.

  
Aux fins de l'invention, le séparateur est de préférence du type centrifuge, établi sous la forme d'un conduit cylindrique ou conique vers lequel la mousse est refoulée tangentiellement, de sorte que les constituants de celle-ci se déplacent dans le séparateur suivant un trajet hélicoïdal, le gaz étant séparé du liquide, et le gaz et le liquide étant évacués séparément.

  
A titre de variante, le séparateur peut comporter ou être constitué par un ou plusieurs conduits munis de pales ou aubes fixes contre lesquelles la mousse est refoulée et qui sont formées de façon à imprimer à <EMI ID=8.1> 

  
Dans une autre variante, le séparateur peut comporter ou être constitué par une hélice ou autre dispositif à pales.entraînés en rotation par la pression du gaz contenu dans la mousse entrant dans ce séparateur, le gaz et le liquide ou la suspension étant évacués séparément, de ce sé-

  
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Dans certains cas, une mousse peut, être désagrégée entièrement

  
ou partiellement par son passage à travers un étranglement ou un ajutage, dans lequel cas, - on éprouve des difficultés pour évacuer séparément le gaz' et le liquide obtenus. Par conséquent, il peut être. avantageux dans certains cas dé faire, passer là mousse à travers un ajutage ou un étranglement prévu

  
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ce qui peut créer de graves difficultés. Comme on le verra, la présente invention rend superflu l'emploi d'un moteur séparé et fait en sorte que la  désagrégation de la mousse s'opère au fur et à mesure de la formation de . celle-ci.. 

  
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mes. Ainsi, le conduit ou la chambre constituant le séparateur centrifuge ou autre, peut être disposé verticalement ou horizontalement ou sous tout an-

  
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se déplace vers l'axe du conduit ou de la chambre et peut être évacué depuis l'une ou l'autre de ses extrémités, de préférence à travers .un-tube de sortie de gaz disposé axialement. Le liquide ou la suspension liquide est projetée naturellement dans le sens radial vers l'extérieur, pour entrer en 

  
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  SEPARATION OF GAS AND LIQUID OR SUSPENSION FROM

OF A FOAM.

  
There are many industrial processes in which a foam or froth can be produced either intentionally (eg in the foam float employed in the concentration of minerals) or incidentally.

  
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some gas) . Sometimes it is a matter of treating the liquid; or, the liquid may contain finely divided solids in suspension, and the gas may be bubbled and distributed through the suspension to react with the finely divided solids. Sometimes the mixture is subjected to agitation. In many such cases the gas emerges not in simple gaseous form, but in the form of a foam which must be broken up. The present invention aims to provide methods and apparatus for disintegrating such foams, so that the gas can be discharged from its side and the liquid or liquid suspension can be discharged separately.

  
In an apparatus in which a liquid, alone or containing finely divided matter in suspension, is subjected to treatment by the

  
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ment a separator to which the foam is directed and from where the gas and the liquid (or the suspension) are discharged separately.

  
It goes without saying that, after the treatment, a significant proportion

  
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This invention relates to the problem of foam.

  
The gas is preferably pumped into the liquid and distributed therethrough under sufficient pressure not only to force the bubbles

  
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results, under the pressure necessary to operate the separator (for example a centrifugal separator).

  
In the part of the installation where the foam is formed, and in accordance with one characteristic of the invention, the tank containing the foam

  
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be maintained, the part where the foam is formed is closed except for the essential inlets and outlets, comprising in particular the outlet towards which the foam is directed through the separator or towards it.

  
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board, which must be drained from the tank in addition to the foam.

  
For the purposes of the invention, the separator is preferably of the centrifugal type, established in the form of a cylindrical or conical duct towards which the foam is discharged tangentially, so that the constituents thereof move into the following separator a helical path, the gas being separated from the liquid, and the gas and the liquid being discharged separately.

  
As a variant, the separator may comprise or be constituted by one or more conduits provided with blades or fixed vanes against which the foam is forced and which are formed so as to print at <EMI ID = 8.1>

  
In another variant, the separator may comprise or be constituted by a propeller or other device with blades driven in rotation by the pressure of the gas contained in the foam entering this separator, the gas and the liquid or the suspension being discharged separately, of this se-

  
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In some cases, a foam can be completely broken up

  
or partially by its passage through a constriction or a nozzle, in which case, it is difficult to remove the gas and the liquid obtained separately. Therefore, it can be. advantageous in some cases to pass the foam through a nozzle or a throttle provided

  
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which can create serious difficulties. As will be seen, the present invention eliminates the need for a separate motor and ensures that the disintegration of the foam takes place as and when the formation of. this one ..

  
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my. Thus, the duct or the chamber constituting the centrifugal separator or the like, can be arranged vertically or horizontally or in any year.

  
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moves towards the axis of the conduit or chamber and can be exhausted from either end thereof, preferably through an axially disposed gas outlet tube. The liquid or the liquid suspension is projected naturally in the radial direction outwards, to enter

  
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Claims

On the other hand, if the axis of the duct or chamber is horizontal or approximate <EMI ID = 14.1>

that the liquid or suspension falls back onto the bottom wall of the conduit or chamber - from where it can be drained.

It has been found that when the foam is introduced tangentially into the duct or the chamber, it is easy to ensure that its inlet speed is very high. For example, in the arrangement where a centrifugal separator has an axial gas outlet near the race. tangential inlet cord for the foam, the foam inlet speed will suitably be 100 feet per second, or more, and the pressure acting on the foam at the inlet may exceed 6 inehes of water column.

The nature of the present invention will become apparent from the following description relating to three examples, with reference to the accompanying drawings, in which:

FIG. 1 diagrammatically represents the application of the invention in the case of a cylindrical or conical separator in which the foam is introduced tangentially and which is represented for greater clarity in sectional view in FIG. 2. FIG. 3 is a schematic section in which a rapid rotational movement is imparted to the foam by means of fixed blades or vanes. FIG. 4 shows in section a device with blades driven in rotation by the pressure of the gas contained in the foam.

a liquid or a suspension, is connected to a mixer or contact tank 13, which is further supplied with pressurized gas by the blower 14. The mixer in this case comprises a controlled outlet 15 for the liquid.

or the suspension having fulfilled its function or having undergone the treatment, as well as a controlled outlet 23 for the gas in excess of that which is necessary to maintain the pressure required in the tank 13 to operate the separator.

The pressurized foam passes through line 16 to separator 17, passing through nozzle 21 and undergoes disintegration, the separated liquid and gas being discharged respectively through outlets 18 and 19.

Appropriate hydraulic seals 24 and 25 are provided in order to allow

maintaining the necessary pressure in the system.

As shown in Figure 3, the separator shown there can be used with the general arrangement of Figure 1; in this case, the foam coming from the mixer arrives at 16 through the constriction 26 and

tation. The separate liquid and gaseous constituents of the foam leave chamber 17 through outlets 18 and 19, respectively. It's obvious that

the separator may not include the constriction 26.

Eraser shown in Figure 4, which shows another variant of the separator that can be used with the general arrangement of

FIG. 1, the foam entering through 16 from the mixer 13 is disintegrated by the action of the blades provided on the device 20, which is rotated in the chamber 17 by the pressure of the gas contained in the foam arriving in this chamber. The separated liquor is discharged by 18, and the gas by 19.

CLAIMS.

a gas, with formation of foam after the gas has passed through the mass of the liquid, the process for breaking up the foam without the provision of mechanical means driven by a separate driving device, this process consisting of keeping the gas (and the foam) under a pressure capable of automatically activating a separator towards which the foam is directed and from which the gas and the liquid (or the suspension) are discharged separately.

gas is pumped into the liquid and distributed therein under pressure,

3.- Method according to claims 1 and 2, characterized in that the centrifugal separator has the shape of a cylindrical or conical duct.

is separated from the liquid and the gas and liquid are discharged separately.

4.- A method according to claims 1 and 2, characterized in that

holding fixed helical blades placed in such a way that =: the, foam

rapid rotation, gas and liquid being discharged separately.

that the centrifugal separator comprises a propeller or other device with blades mounted axially in the gas outlet duct or at the inlet thereof and driven in rotation by the pressure of the gas contained in the foam admitted into this separator, the gas and liquid or suspension being discharged separately from the latter.