DE102017121564A1 - Apparatus for fumigating a liquid - Google Patents

Abstract

(57) The present invention relates to the field of mineral processing, namely a method of flotatively separating mineral particles of different sizes. It can also be used for wastewater treatment, in the chemical industry and other industries where ventilation is required. A device for aeration of a liquid comprises a limited by the partitions container for a liquid to be ventilated, open from the side of the bottom of the container for the liquid to be ventilated gas container, arranged in the gas container Strahlleitdüse, the liquid supply nozzle, the gas supply nozzle and the gas outlet nozzle on. The apparatus additionally comprises a vibration source connected to the gas container and technologically required for dispersibility of outlet bubbles. The container for the liquid to be ventilated has at least 3 partitions, which together form the chambers for the gas bubble separation. 8 dep. Claims, 5 fig.

Description

The present invention relates to the field of mineral processing, namely a process of flotative separation of mineral particles of different sizes. It can also be used for wastewater treatment, in the chemical industry and other industries where ventilation is required.

From the existing state of the art is a two-chamber jet aerator ( RU 2229926 , published Jun. 10, 2004), which consists of a roll commutator and an air duct with at least one inlet opening, characterized in that the roll commutator has uniformly arranged openings along the surface line. The air channel in the form of a P-profile with the outlet openings uniformly arranged along the frame is fastened on the surface of the roll commutator, wherein the outlet openings of the roll commutator are arranged in the hollow air duct hollow body.

The two-chamber jet aerator is provided with a supply line of water-air-turbidity, wherein the roller commutator of the aerator is not closed. The inlet openings of the air channel have the flow rate regulator. The openings of the air channel are arranged on the axis of the openings of the roller commutator. The opening edges of the air channel are arranged on the line passing through the opening edges of the roll commutator and crossing on the axis of symmetry in the hollow body of the roll commutator. The radii quotient of the openings of the roller commutator and the air channel is in the range 2.8-1.9.

The dual-chamber jet aerator does not generate bubbles of similar size but a polydisperse bubble system, which, for example, is not acceptable in flotation flotation. For sewage treatment, such a two-chamber jet aerator is not optimal, as the polydisperse system of bubbles promotes their intense coalescence and the emergence of large, unladen bladders that float without soiling.

From the existing state of the art is a pulse aerator ( RU 2142433 , published 27.09.2000), which comprises a container, a circulating pump with a supply line of a liquid to be treated and the ventilation channels with conical nozzles. It is provided with the distribution chambers, in each of which a suction basin with a discharge pipe and an air regulator are attached with a hydraulic termination, wherein an air pipe of the suction basin is connected to the air regulator and the lower end of the discharge pipe is nozzle-shaped and axially in the conical nozzle of the ventilation tube is arranged with the formation of the annular gap. The device generates a polydisperse bubble system, but this can not be used for the flotative separation of nano- and microparticles. The impulse aerator produces large bubbles that mechanically discharge all hydrophilic and hydrophobic nanoparticles and microparticles to the liquid surface.

From the existing state of the art is an airlift jet aerator ( RU 2156746 , published 10.12.1999), which has a ventilation container, a supply line, an airlift aerating column, wherein an airlift column is provided with a ventilation tube whose upper end in the distribution chamber and the lower end in the first third of the height of the Airlift Pillar are arranged. The Airlift jet aerator generates a polydisperse bubble system, but this can not be used for the flotative separation of nano- and microparticles. The Airlift jet aerator produces large bubbles that mechanically discharge all hydrophilic and hydrophobic nano- and microparticles to the liquid surface.

From the existing state of the art, a ventilation method for the flotation of substances (Patent Document 1284600, published 23.01.1987) is known in which the ventilation is achieved in that a liquid jet adheres to the gas bubbles at the interface of the separation of the gas and the liquid phase characterized in that the liquid jet is directed in the opposite direction to the liquid flow to achieve aeration efficiency by the slope of the gas saturation of the liquid. The aeration process produces a polydisperse system of starting bubbles that is acceptable for the flotative separation of conventional grain size particles but can not be used for the flotative separation of nano- and microparticles.

From the existing state of the art, a ventilation method of a liquid for flotation (Patent DE 1260026, published 30.09.1986) is known in which a liquid jet to the interface of the separation of the gas and the liquid phase with the formation of a fluid vortex around the joint area around said boundary surface is supplied, which is characterized in that, in order to achieve the slope of the gas saturation of the liquid, the free liquid jet is given a rotating movement, but the liquid flow is set in the fluid vortex in a counter-movement. Due to the high uncontrolled turbulence, this process generates a polydisperse system of small starting bubbles, which become larger as coalescence progresses Bubbles form what is acceptable for the flotative separation of particles of conventional grain size, but can not be used for the flotative separation of nano- and microparticles.

From the existing state of the art are the devices for the ventilation of a liquid of Michael Slobin and his community inventors (Patent document 1561452, published 30.08.1994, Patent document 1658577, published 30.06.1994) known. These devices generate a polydisperse bubble system, as a water-air jet encounters multiple obstacles as it comes out of the device several times, promoting the coalescence of the bubbles several times with each other and the formation of larger bubbles. The less disperse system can be produced in the device only at the high foaming concentration, as the bubbles are enveloped by the foaming molecules their coalescence decreases.

The prior art discloses a device for aeration of a liquid by Michael Slobin and his co-inventors (Patent Document 1729090, published 30.06.1994) in which the gas-liquid system passes through the hydrodynamic pipes several times. Such dispersing at low foaming concentration has a polydisperse bubble system because both the coalescence of the bubbles and their division into smaller bubbles occurs several times while passing through the obstacles (the hydrodynamic pipes). A finely dispersed bubble system is achieved by the high foaming concentration in the aeration device, which results in little coalescence of the bubbles in the volume of the pulp, but more like the formation of the requisite floto complex by the same coalescence ("the fusion of air bubbles") of the bubbles on the surface of a mineral particle is beneficial. In such a design, the mineral particle should be covered with the finely dispersed bubbles, which should not coalesce with other finely dispersed bubbles due to the high foaming concentration. The volume of finely dispersed air bubbles adhering to the mineral pond will in most cases not be sufficient enough to lift the flotocomplex to the surface in the pulp and to exit the foam product (concentrate). This device can not be used even for the finely dispersed pulp because of the risk of clogging and the mechanical stress of the hydrodynamic pipes can quickly lead to their Abrasionsverschleiß. In addition, each hydrodynamic whistle has a whole set of harmonics of its sound spectrum, which leads to the polydisperse atomization of the drops and bubbles. The many existing obstacles to be overcome by the gas-liquid jet substantially increase the energy expenditure, with some of the energy for heating the bubbles, drops and liquid being lost.

The Niku KTM Microbubble Generating Pump (http://www.daf-pump.com/applications) is one of the existing aerators that produce the nano- and micro-bubbles. This aerator produces micro bubbles of average size 5 μm. The microbubbles are generated as follows: first, a liquid is mixed with a gas; second, a targeted gas-liquid mixture is separated, with microbubbles being withdrawn, but the larger bubbles are withdrawn through a corresponding nipple, which is not an optimal solution because not all of the gas is converted to the nano- and microbubbles. There are a number of prior art aeration devices in which the nano- and micro-bubbles are created by separating the gas-liquid mixture into large and small bubbles. The gas from the big bubbles is released into the environment.

The closest technical solution according to the invention is a device for the ventilation of a liquid (Patent Document 1108078, published 15.08.84), which has a container for a liquid to be ventilated and an aerator with an air and liquid supply line with the positive pressure promotion, wherein the Increasing efficiency and efficiency of the device, as well as the ejection ratio increase of the aerator, the reduction of wear and the uniform distribution of the dispersed gas in the container, the aerator consists of a ventilation and a control device in the form of open from the side of the container bottom chambers, wherein the chamber of the ventilation device is connected to the liquid supply line and provided with a Strahlleitdüse and a gas supply nozzle, the chamber of the control device is provided with a partition, the lower end side higher than the lower n end faces of the walls of the chamber separated by this partition in two rooms, wherein the first space is connected to the gas supply line and the nozzle of the gas supply line in the chamber of the ventilation device and the second space is provided with the excess gas discharge from the chamber of the control device.

1. 1. Polydispersität von Ausgangs-Blasen infolge der Zerteilung des Flüssigkeitsstrahles beim Ausstoßen der Luftblasen in das polydisperse Tropfensystem.
2. 2. Keine Größenverstellung der Ausgangs-Blasen, da die beim Ausstoßen der Gasblasen durch die Grenzfläche der Trennung der Gas- und der Flüssigkeitsphase entstehenden Blasen der unterschiedlichen Größen ohne erforderliche Resonanzwirkung auf den Flüssigkeitsstrahl erzeugt werden.
3. 3. Gasüberschussemission, was den Nutzeffekt des Belüfters senkt.

The disadvantages of the closest prior art are:

1. 1. Polydispersity of starting bubbles due to the fragmentation of the liquid jet as the air bubbles are expelled into the polydisperse droplet system.
2. 2. No size adjustment of the output bubbles, since the ejection of the gas bubbles be generated by the interface of the separation of the gas and the liquid phase resulting bubbles of different sizes without a required resonance effect on the liquid jet.
3. 3. Excess gas emission, which lowers the efficiency of the aerator.

The technical problem to which the present invention is directed is the development of a device which can produce any technologically required dispersity of starting bubbles. For the different dispersity of mineral particles in the flotation, the starting bubbles of different sizes are required. Ultra small bubbles are required, which can adhere to a mineral surface of the particle to be floated, as well as large transport bubbles coalescing with these small bubbles and providing a necessary floatation to a flotocomplex. The diameter of the large bubbles must not exceed a certain level, as they will: firstly, have a rate of rise at which they would not react with the other already charged bubbles and consequently could not float up laden; second, because of their high kinetic energy when floating, the big bubbles can destroy the formed flotocomplex; third, large bubbles are in flotation, e.g. of sludge, not applicable.

The technical object is achieved in that a device for venting a liquid bounded by the partitions container for a liquid to be ventilated, an open from the side of the bottom of the container for the liquid to be ventilated gas container, a gas container fixed Strahlleitdüse, the According to the invention, the gas container comprises an upper lid in the form of a driving piston, a jet nozzle is movably formed in the piston and the container for the liquid to be aerated is at least 3 together Has chambers for the gas bubble separation forming partitions.

A larger number of the separation chambers formed by the partitions in the container for the liquid to be ventilated is conducive to a better estimation of the dispersity of the exit bubbles generated by the aeration device and distributes bubbles according to their size according to the technology requirement in the corresponding chambers.

Achieving the above technical problem, the following individual cases of the embodiments of the invention are conducive.

A Strahlleitdüse is formed so that the beam can be adjusted by an outflow opening at the Strahlleitdüsenspitze.

The outflow opening of the Strahlleitdüse is slit-shaped.

The outflow opening of the Strahlleitdüse may be circular or oval.

The outflow opening of the Strahlleitdüse may be formed conical.

It is used as a vibration source, an electrodynamic sound source, an amplifier and a frequency generator. A gas container, a Strahlleitdüse, a frequency generator, an amplifier and an electrodynamic sound source together represent a source of resonance effect on the liquid jet.

The gas supply nozzle is arranged tangentially with respect to the gas container.

The container for the liquid to be ventilated may be in the form of a cylinder and the separation chambers are divided by the lateral surfaces of the cylinder.

The Strahlleitdüse is introduced tangentially in the container for the liquid to be ventilated.

• 1 zeigt die Vorrichtung zur Belüftung einer Flüssigkeit samt den Separationskammern mit einem polydispersen System von Blasen, wo das maximale Schaumschicht in der letzten Separationskammer mit den kleinsten Blasen ist.
• 2 zeigt die Vorrichtung zur Belüftung einer Flüssigkeit samt den Separationskammern mit einem polydispersen System von Blasen, wo das maximale Schaumschicht in der ersten Separationskammer mit den großen Blasen ist.
• 3 zeigt die Vorrichtung zur Belüftung einer Flüssigkeit, wo das maximale Schaumschicht in der mittleren Separationskammer mit den mittelgroßen Blasen ist.
• 4 zeigt die Vorrichtung zur Belüftung einer Flüssigkeit, die an einem monodispersen System von Blasen in der vorletzten Separationskammer mit den kleinen Blasen ähnlicher Größe nah ist.
• 5 zeigt die Vorrichtung zur Belüftung einer Flüssigkeit, die an einem monodispersen System von kleinen Blasen in der letzten Separationskammer nah ist.

The invention is explained in more detail in the drawings:

• 1 shows the device for aeration of a liquid together with the separation chambers with a polydisperse system of bubbles, where the maximum foam layer is in the last separation chamber with the smallest bubbles.
• 2 shows the apparatus for aeration of a liquid, including the separation chambers, with a polydisperse system of bubbles where the maximum foam layer is in the first separation chamber with the large bubbles.
• 3 shows the apparatus for aeration of a liquid where the maximum foam layer is in the middle separation chamber with the medium sized bubbles.
• 4 shows the apparatus for aeration of a liquid which is close to a monodisperse system of bubbles in the penultimate separation chamber with the small bubbles of similar size.
• 5 shows the apparatus for aeration of a liquid which is close to a monodisperse system of small bubbles in the last separation chamber.

LIST OF REFERENCE NUMBERS

1-

Pipeline;

2

Pump;

3

Container with the liquid to be aerated (or with the liquid solution with foaming agents) and container from which the liquid is supplied;

4

Liquid flow meter;

5

Piston for the adjustment of the resonance chamber;

6

A jet-forming nozzle;

7-

Gas containers in cylindrical form (or in another form);

8th-

Vibration source (for example, an electrodynamic loudspeaker or any sound and vibration source);

9-

Amplifier;

10-

Generator of the adjusted frequency;

11-

Separation chambers according to the size of the bubbles;

12-

Adjustable gas supply and gas outlet nozzles;

13-

Nozzle for the gas supply tangentially into the resonance chamber.

The device for aeration of a liquid (the acoustic jet aerator) works as follows:

The liquid gets through the pipeline 1 from the pump 2 and further through the jet-forming nozzle 6 given, their amount through the liquid flow meter 4 is determined. One from the jet-forming nozzle 6 incoming beam is fed at an angle to the interface of the separation of the gas and the liquid phase and ejects gas from the gas container 7 into the container for the liquid to be ventilated 3 out. With the generator 10, a frequency is set, which is to the amplifier 9 is given and on to the sound source 8th (for example, to an electrodynamic speaker) connected to the gas tank 7 connected is. The volume of the resonant gas container 7 becomes by means of the piston the change of the resonance chamber 7 for ejecting the necessary disperse composition of bubbles of liquid displaced by the separation chambers 11 is determined. At the frequency setting with the generator 10 and in adjusting the volume of the gas container 7 , virtually any dispersity of the starting bubbles - monodisperse or polydisperse ( - ) to be generated. The dispersity is assessed in the separation chambers through the foam layer. At the flotative foaming agent concentration POBA (propylene oxide butyl alcohol) - a mixture of propylene glycol monobutyl ether equal to 16 mg / l, at the _jet thickness equal to d _jet = 0.8 mm, at the jet velocity equal to V _jet = 5 m / s, at the frequency set by the generator equal to 3420 Hz, for example, bubbles are produced in the foam layer of the separation chambers: 80% have a diameter of 0.3 mm; 12% - a diameter of 0.2-0.3 mm; 8% - a diameter of 0.3-0.5 mm. These measurements are approximate because they are determined from the photos of the foam layer. Low frequency excitation produces larger and more polydisperse bubbles. In the high-frequency excitation smaller bubbles of similar size are formed. The much higher foam layer formed in one of the separation chambers shows that it has formed from the bubbles of similar size. The small bubbles of similar size coalesce much less and thus form a high irrigated foam layer.

The separation chambers are designed for the assessment of the disperse composition of the formed exit gas / air bubbles. The large bubbles come into the nearby separation chamber, smaller bubbles enter the other separation chambers.

For a short-wave sputtering of the wired beam onto the drops of similar size, which eject the bubbles of similar size, one of the gas containers 7 and the gas pipe 13 formed and tangentially inserted into the gas tank whistle used. At frequencies higher than 10 kHz, a mist-like system of bubbles of 5 to 20 μm is formed. The size of the bubbles was estimated according to the water clarification. The water purification process took from a few minutes to a few tens of minutes.

In order to achieve the separation of the bubbles depending on the similar size and the reduction of their coalescence, the container for the liquid to be ventilated 3 in the form of the cylinder and are divided by the coaxially arranged cylinder separation chambers.

A jet of liquid passes tangentially through the interface of separation of the gas and liquid phases into the container for the liquid to be aerated 3 with the cylindrical divided by the coaxially arranged cylindrical partitions Separation chambers introduced. Such introduction of the liquid jet allows a uniform distribution of the bubbles in the container for the liquid to be ventilated 3 , their coalescence reduction and their rapid separation distribution through the separation chambers 11 ,

The adjustable sockets 12 are for keeping constant the exact resonance space in the resonance chamber 7 designed. The exact volume of air supplied (gas volume) can not be made possible only by the compressor or a similar system, it is therefore an additional air outlet (gas outlet) from the resonance chamber 7 required.

For a flotation of the mineral particles of different size and dispersity may be a required system of bubbles from the separation chambers 11 to be used.

As a result, this technical solution solves the problem of aeration in the flotation of coarse-grained mineral particles by means of the large bubbles and in the flotation of nano- and microparticles using the ultra-small bubbles without additional energy expenditure for gas dispersion (air dispersion).

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• RU 2229926 [0002]
• RU 2142433 [0005]
• RU 2156746 [0006]

Cited non-patent literature

• Michael Slobin and his community inventors (Patent document 1561452, published 30.08.1994, Patent document 1658577, published 30.06.1994) [0009]

Claims (9)

Device for aeration of a liquid has a limited by the partitions container for a liquid to be ventilated, open from the side of the bottom of the container for the liquid to be ventilated gas container, arranged in a gas container Strahlleitdüse, the liquid supply nozzle, the gas supply nozzle and the gas outlet nozzle , characterized in that it additionally comprises a vibration source connected to the gas container, wherein the gas container has an upper cover in the form of a driving piston and a Strahlleitdüse movably formed in the piston and the container for the liquid to be ventilated at least 3 together forming the chambers for the gas bubble separation Having partitions. Device after Claim 1 , characterized in that the Strahlleitdüse allows a beam formation through an outflow opening at the nozzle tip. Device after Claim 2 , characterized in that the outflow opening of the Strahlleitdüse is slit-shaped. Device after Claim 2 , characterized in that the outflow opening of the Strahlleitdüse is circular or oval. Device after Claim 2 , characterized in that the outflow opening of the Strahlleitdüse is conical. Device after Claim 1 , characterized in that an electrodynamic sound source, an amplifier, a frequency generator are used as a vibration source. Device after Claim 1 , characterized in that a gas supply nozzle is arranged tangentially with respect to the gas container. Device after Claim 1 , characterized in that the container for the liquid to be ventilated is in the form of a cylinder and the separation chambers for the bubbles are divided by the lateral surfaces of the cylinder. Device after Claim 5 , characterized in that the Strahlleitdüse is introduced tangentially into the container for the liquid to be ventilated.

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