JPH06500260A - liquid aeration - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] liquid aeration "Technical field" This invention performs aeration of liquids, especially the absorption of gases into liquids. Separation of dissolved gases from liquids and separation by flotation of droplets or particles suspended in liquids , or relating to the formation of a group of bubbles to be transferred into a container of liquid to perform the above-mentioned action. It is something that

"Background technology" For each of the above-mentioned fj applications, the transport of matter between phases or the collection of particles by flotation The gas is first dispersed into fine bubbles to form a large area sandwiched between two sides. The advantage is that A dense dispersion of microbubbles in a liquid results in absorption and exfoliation. Injecting a gas mixture into a container where another transfer action such as stripping or flotation can be carried out Another advantage is that Traditionally, this has been done with many different types of diffusers, e.g. By means of baffles, nozzles or jets, or vanes of various shapes and stators. However, the size of the bubbles created, the flow rate of the bubbles, and the amount of aeration required There are sufficient restrictions on the dispersion of bubbles into the liquid body.

The purpose of the method and device for aeration of liquids according to the invention is to Provides a device for distributing the flow of gas into a mixture, as well as distributing the flow of gas into a large container of liquid. The object of the present invention is to provide a device for effective use of foam.

"Disclosure of invention" According to one form, the invention provides a downwardly extending conduit whose lower end is immersed in a liquid. Pass the liquid as a jet moving downwards into the upper part of the conduit (forming a bubble, A process force that causes bubbles to move downward and exit into the liquid from the lower end of the conduit. It consists of a method of aerating the body.

Preferably, the gas is supplied to the top of the conduit to form a bubble. It will be done.

Preferably, the top of the conduit is closed and the gas is supplied at atmospheric pressure and with flow control restrictions. be done.

Also, the top of the conduit is closed and pressure gas is supplied by a blower or compressor. .

In one form of the invention, the liquid passing through the top of the conduit contains a supersaturated solution in the liquid. It cooperates with the gas in the liquid.

The gas can be any convenient gas required, and in many applications it consists of air. There is.

In another form, the invention provides a generally vertically extending conduit with an open lower end; A lower section provided at the top of the conduit to form a jet of liquid that is injected downward into the conduit. A liquid supply device installed to supply liquid under pressure to a nozzle facing toward the and a support device arranged to support a conduit whose lower end is immersed in aerated liquid. It consists of equipment that

Preferably, a baffle plate extends outwardly from outside the conduit and is provided to be immersed in the liquid. provided in a conduit and exiting outwardly from the conduit at the lower end of the conduit so that bubbles rise through the liquid A deflector plate is provided to disperse the bubbles.

Preferably, the baffle surrounds the conduit and extends upwardly and outwardly from the intended location on the exterior of the conduit. It consists of a board.

Additionally, the plate includes a plurality of holes sized to allow a predetermined flow rate of bubbles to pass through the holes. It is set in.

Preferably, a gap is provided between the inner circumference of the plate and the outer surface of the conduit, and a diversion ring is provided. , on the outer surface of the conduit below the gap, between the conduit and the plate, with bubbles moving outward and upward from the conduit. It is provided to deflect away from the gap.

In one form of the invention, the flow of gas within the conduit has an axis parallel to the axis of the conduit. A suction pipe is installed inside the conduit and is configured to direct the jet and suppress the jet within the conduit. I'm being kicked.

Preferably, the conduit is generally circular in cross-section or has other cross-sections having equal magnitude transverse axes. has an effective diameter equal to the diameter of a circle of the same area, and the diameter of the conduit is equal to the diameter of the nozzle. It is within the range of 2 to 20 times.

Furthermore, preferably the diameter of the conduit is within the range of 3 to 12 times the diameter of the nozzle.

The liquid to be aerated is passed through a nozzle in a downwardly moving jet to the upper end of the conduit. It can be a flowing liquid or a liquid in which the lower end of the conduit is immersed. In many cases In addition, the liquid exiting the top of the conduit can be made to be the same as the liquid inside.

Examples in which this invention can be implemented are as follows.

(a) remove harmful components and reduce biochemical oxygen demand before discharging into sewage or rivers; Dispersion of microscopic bubbles in wastewater to generate oxygen for the growth of microorganisms used as Aeration of wastewater pools and streams required to produce.

(b) Adding the oil droplets themselves to the foam to treat water or streams containing finely dispersed oil droplets. Remove oil droplets from the main part of the liquid by letting it rise to the surface of the liquid in a pool or container. A process of removing and purifying.

The fine dispersion of bubbles results in the creation of a liquid jet that plunges into a column of dense foam in a vertical tube. Occurs in a conduit or tube that is generally vertical depending on the application. Bubbles are high-speed jets of liquid. generated at least in part by the shearing action between the foam and the relatively quiet dense foam. .

The speed of the jet is high, with very small bubbles up to about 500 microns in size. Fast enough to disperse the air conveyed into the foam. Furthermore, if there are no large bubbles , the two-phase mixture generated flows as a substantially homogeneous stable mixed fluid to absorb and float. It can be seen that it creates an advantageous environment such as play and homogeneous processes.

Since the jet of liquid is fed into the top of the vertical tube, the two-phase mixing created within the tube The material is forced to move downwards and is released into a large container. 1 ]1 Compound flow is most effective when the compound is discharged from the end of a vertical tube with parallel walls. It is known that the foam used is not transferable. Finely dispersed high-density foam acts as a single, homogeneous phase whose density is much lower than that of the ejected liquid. Therefore, the bubbles become attached to the outer wall of the vertical pipe and the liquid water inside the container becomes Rise quickly to the surface.

If a homogeneous foam flowing from the bottom of a vertical tube is made to mix with the surrounding liquid , it allows better utilization of the foam, so that the foam can be separated from each other and actually present in a large amount of liquid. If it rises, it will rise. If very small, the rise time of individual bubbles is The rise time of the homogeneous mixture coming out of the bottom is longer and therefore the minute to disperse the bubbles. The effective time for the child will be very long.

One object of this invention is to limit the discharge of liquid into a generally vertical tube into a container. The shearing action of high-speed liquid jets is used to form dense foam during liquid flow. To provide a device that effectively disperses gas in a stream of fine bubbles that are well mixed with There are many things.

Another object of this invention is to provide containers that are to be separated from each other so that they rise slowly to the surface of the water. Transformation of materials between phases also occurs, giving a greatly enhanced time between foam and liquid within contact vertically from the bottom of the tube, giving maximum opportunity for the capture of fine particles by the bubbles. The purpose of the present invention is to provide a simple and effective device for producing individual bubbles of a roughly homogeneous mixture. Ru.

"Brief explanation of drawings" One preferred embodiment of this invention, regardless of other embodiments falling within the scope of this invention. and its variants will be explained below with reference to the accompanying drawings.

Fig. 1a is a schematic cross-sectional elevational view of the basic form of the aeration device according to the present invention, Fig. 1b The figure shows the condition of a diffuser, a floating column of dense foam without a deflector. A diagram similar to Figure 1a, Figure 1c shows the flat surface of the diffuser or baffle plate associated with the aeration system of Figure 1a. cross section, Figure 2a shows an alternative embodiment of the baffle plate forming part of the aerator of Figure 1a. Cross-sectional schematic elevation of the lower part of the tube, Figure 2b is a plan view of the deflector shown in Figure 2a, Figures 3a and 3b are its top views; A cross-sectional schematic elevational view of another embodiment of the baffle plate, FIG. a cross-sectional schematic elevation showing an aeration device with baffles; Figure 4b is a plan sectional view of the nozzle and baffle plate structure shown in Figure 4a, and Figure 5 is a sectional view of the conduit. 6a and 6. Figure b is a diagram similar to Figure 5 showing another example of the suction pipe, and Figure 7 shows another suction pipe structure. This is a diagram similar to FIG. 5.

"Best mode for carrying out the invention" In the embodiment of the invention shown in FIG. 1a, the liquid enters the inlet tube 1 vertically downward It enters through a nozzle arrangement 22 terminating in an orifice 2 oriented toward the periphery. Nozzle equipment The housing 22 is attached to the top of the vertical conduit or tube 3. During operation, liquid flows through tube 3 It exits the orifice 2 in the form of a high-velocity jet that can travel downwards through it.

The vertical tube 3 is attached by a support member 3a so that its lower end is a container for liquid 4. Immersed inside. The liquid may or may not be the same as the liquid entering through inlet tube 1. stomach.

First, before starting operation, the water level in the container and in the vertical pipe 3 are the same. high speed liquid When the jet is first formed by orifice 2, it passes through tube 3. moves downward and enters the liquid, carrying the gas inside the tube 3 to the lower end of the tube 3. 5 and rise inside the container in the form of fine bubbles. Vertical pipe 3 is The pressure in the head space of tube 3 quickly fills with bubbles of dense foam dispersed in the feed liquid. The force drops below the ambient pressure outside the tube 3. Therefore, although it is -a, it is necessary to Unwanted new gas is sucked into the tube 3 through the air volume 1f6.

The gas flow is regulated by a normally provided control valve 7 or other suitable member. , the amount of air entering through the air inlet pipe 6 is the maximum amount carried by the injection jet 8. Less than a lot. In this way, the vertical tube 3 provides mutual protection between the gas and liquid phases. It remains filled with dense foam that provides a good environment for its action.

The vertical tube 3 in which the foam mixture is formed is approximately vertical, i.e. within 15° to the perpendicular. suitable. The process is carried out in the tube 3 so that high-density bubbles move downward toward the tube outlet 5. Based on the degree of coalescence of the bubbles that are It can be carried out well if an aeration device is installed at the time of installation. If the bubbles coalesce The bubbles then recirculate in the form of internal gas, which increases the amount of gas in the top of the sloping tube. It rises into the head space of tube 3 in the form of large sludge. Reach the head space in tube 3 Then, the foam turns into a dense foam, resulting in the collapse of the foam mixture inside the tube.

Therefore, tube 3 works best if the tube is generally vertical.

Although the invention will be described with reference to a circular tube 3, it is not limited to this circular shape. The pipe is intended to be interchangeable with vertical ducts of any cross-section. It is. However, the best results are achieved by regular polygons and the ratio of horizontal axes from large to small. It is found in the cross section.

Entrainment of gas into dense foam mixtures by the action of high-speed liquid jets Thus, an aeration device is described for forming a dispersion of gas bubbles in a liquid. . In this application, the gas is supplied exclusively by the entrainment method.

However, in flotation of fine particles, not only the shape of bubbles produced by high-speed jets is important. Preferably, the gas is supplied by growth from a supersaturated feed solution. Liquid gushes There is a substantial drop in pressure as it passes through the injection nozzle. Therefore, before passing through the nozzle When the feed liquid is saturated with flotation gas, the downstream side of the nozzle becomes supersaturated and dissolved. The solution is released in the form of very fine gas bubbles. The existence of such bubbles is due to the presence of bubbles. Because the surface area per volume is very large and the microscopic hydrophobicity required for floating The flotation process is aided by the ability of bubbles to preferentially attach to the surface of the particles.

Therefore, the ability to suspend fine particles by foam is reduced by the use of a supersaturated feed liquid. It will be strengthened.

When dissolved gas is used to enhance the flotation process, the shearing action of the injection jet bubbles, typically about 500 microns in diameter, produced by There is a synergistic effect between the bubbles produced by Yes. Because the latter bubbles are very small, the rising speed of the bubbles is small, and therefore the circular The time required for the bubbles to rise to the surface of the liquid after leaving the bottom of the tube 3 is non-trivial. You can always do it for a long time. However, when the bubble sizes are mixed, the average diameter is As coalescence occurs between small and large bubbles, the rise time to the surface increases. can be shortened, so that the volume of the container into which the tube 3 discharges can also be reduced.

In applications where the only gas supply is the solution in the liquid flowing through the nozzle arrangement 22, Only gas can be supplied using the released gas. The top of the conduit, i.e. tube 3, is closed Therefore, the inlet pipe 6 can be omitted.

The gas-liquid mixture formed in the vertical tube 3 has a void of up to about 60% by volume; behaves as a homogeneous fluid with a lower density than the liquid in the container 4, and therefore has special uses. If there is no mind, it will rise as a floating water column, hugging the outer wall of pipe 3 and forming part 1b. As shown in the figure, it quickly rises to the water surface 9. Therefore, bubbles in the water column are The liquid does not mix well with the liquid in the container and the maximum risk of contact between this liquid and foam is that it is lost. It will be done. To prevent the formation of a water column there is a shield, i.e. a deflection, on the outside of the vertical pipe 3. Preferably, a plate 10 is installed, such a baffle plate 10 This causes gas bubbles to rise individually through the liquid in container 4 above the water column. It has the effect that it can be used.

Foam diffusers, or baffles, have an inverted truncated conical shape with a wide end at the top It can be suitably made from board material. As shown in Fig. 1C of the cone, there are many holes. provided. In action, the floating water column exiting the outlet 5 of the vertical pipe 3 rises. Diffuser, i.e. the individual holes of the baffle plate 1° distributed on the underside of the baffle plate 1o 0 through 11 After passing through the individual holes 11, the gas bubbles become capacitated as shown in Figure 1a. Each rises in the liquid in the container 4.

The diameter of the conical baffle plate 10 shown in FIG. 1c ranges from 1.5 to 10 times the outer diameter of the tube 3. Good results are obtained when the cone diameter is 2 to 3 times the tube outer diameter.

The angle of the cone at which the truncated head is formed is preferably in the range of 30'' to 60''. Hole 11 The diameter of the surface can range from 1 to 30 mm, with an open area within 1 to 15% of the surface. The holes should be evenly distributed on the conical surface to form the mouth part.

The baffle plate does not necessarily have to be conical. The radial spacing from the tube axis increases. Upright the underside of the baffle plate above the outlet 5 of the vertical tube 3 so that it always increases when increasing. Other shapes, such as having a section, can be made well. If the lower side of the deflector surface is horizontal, or if it falls downward so that the radial distance from the vertical tube increases , bubbles tend to gather in this area and coalesce, so there is less surface area per unit gas volume. This is done to reduce the efficiency of the contact between the gas and the liquid.

Another shape of the baffle plate is shown in Figures 2a and 2b, in which the baffle plate 12 has a circular dish shape. The radius of curvature of the 0 plate part where the hole 13 is provided in the plate part is the same as that of the vertical pipe 3. A range of 2 to 20 times the diameter of the baffle plate 12 is preferred, as shown in Figure 2b. is within the range of 1.5 to 20 times the outer diameter of the tube 3, and the diameter of the baffle plate is within the range of 2 to 20 times the outer diameter of the tube. Good results are obtained at 3x. The diameter of the hole 13 should be within the range of 1 to 30 mm. The deflector can be deflected so that the total area of the hole is within 1 to 20% of the deflector plate surface. Preferably, the holes are evenly distributed over the surface of the plate.

A difficulty seen in baffle plate constructions such as those shown in Figures 1a and 2a is that the container The solid material suspended in the liquid in the baffle plate 10.12 accumulates on the top surface of the baffle plate 10. ．． 13 is deposited in a thick layer that blocks it. Difficulties like this are a distraction. An annular gap 15 (Figs. 3a, 3b) is provided between the plate 10.12 and the wall of the tube 3. can be removed by installing baffle plates 10.12 to conical deflection The plate is designed to allow solid materials that tend to accumulate on the top surface to slide down towards the center of the cone. Since the surface is provided at a constant angle with respect to the horizontal plane, it is suitable for such uses. So The angle of the cone where the baffle plate is a truncated cone is the angle at which the solid material slides toward the axis and forms an annular shape. It should be made to fall through the gap.

Preferably, a diversion ring 14 is used in conjunction with the annular gap 15. conversion ring The purpose of 14 is to allow the dense foam rising from the open end 5 of the tube 3 to enter the annular gap 15. This is to prevent the deflection plate 10.12 from being avoided.

The diversion ring 14 is attached to the outer wall of the vertical tube 3 and forms a triangular shape as shown in Figure 3a. The conversion ring 16 can have a circular cross section or a semicircular cross section as shown in FIG. 3b. Can be done well.

Another embodiment that improves the action of the liquid jet 8 shown in FIG. 1 will now be described. cormorant. When the aerator is in operation, the jet is filled with dense foam filling the vertical tube 3. The gas that enters the droplet and enters from the inlet pipe 6 is absorbed by the shearing action at the edge of the jet. It is transported in a dense foam. Jet speed ranges from 3 to 40 m/s It should be done within. If the speed is too slow, the volume of liquid being delivered The volume of air that can be sent becomes very small, and if the speed is too high, , the demand for energy becomes excessive. Good actual working speed is 12-20 meters/ It is in the range of seconds.

If the diameter of the jet is too small, it will be blocked by incidental material in the feed liquid. Determined by practical considerations of fear. The minimum diameter is the diameter that allows the suspended material to pass through. It should be done in such a way that the The diameter of the vertical tube 3 ranges from 2 to 20 times the jet diameter. A suitable effect is seen within a range of 3 to 12 times the jet diameter. It will be done.

The bubbles created by the incoming jet are created by the jet and the dense area into which the jet enters. The degree is generated by the shear force caused by the velocity difference between the foam and the foam. bubble final An important dimension decision is the power consumed per unit volume of fluid contained in the generator. It is power. To determine this volume, the impinging jet moves downwards within the dense foam. When moving to the point, it spreads out and gives a forward moment, and the expanding jig at the point where it becomes It is used to see that the jet comes into contact with the wall of the vertical tube 3.

The jet is expanded as a cone with an included angle in the range of 10 to 20 degrees. I can see it. Therefore, for this purpose, the energy contained in the jet is actually The volume consumed is at the inlet point of the jet and when the jet just touches the wall of the vertical tube 3. It can be determined as the volume of fluid contained in the vertical tube 3 between the point

Between the point of entry of the jet and the point at which the jet just begins to touch the walls of the vertical tube. The distance is described as the plunge distance, and the length of the limiting vertical tube 3 is less than the plunge distance. is also required to be large. At this time, the initial moment of the jet changes the cross section of the tube. A two-phase mixture is created which is expanded across and is substantially homogeneous.

Since the jet is slowly expanded at intervals from orifice 2, the plunge interval , it will therefore be clear that the height of the vertical tube 3 becomes excessive. For this problem One solution is to use multiple nozzles in a single vertical tube to or for the liquid to be supplied to the chamber 17 through the inlet tube 1 before exiting the orifice. The flow is divided between the nozzles as shown in FIG. 4a. The number of jets is A large number of jets reduces the jet diameter at a given flow rate and In practice, the minimum jet size should be such that it is not blocked by solids suspended in it. determined by consideration. The jet velocity is determined by the pressure within the chamber 17; Therefore, it is the same for each jet.

As shown in Figures 4a and 4b, each jet in the internal vertical duct is divided into Further improvements can be made by providing vertical baffles to the multi-jet device.

Without such a baffle, each jet would be affected by the turbulent fluid of the adjacent jet. It is mainly partitioned, and partially partitioned by the wall of the partition pipe 3. vertical deflector 20 form a solid physical boundary that fixes the energy consuming region around each jet. , which helps to divert the carrier gas into the microbubbles. separated by vertical baffle plate 20. Each cross-sectional area 21 of the defined tube cross-section is approximately the same.

As noted in FIG. 4a, the nozzle 2 is attached to the lower end of the short tube 22. The structure is similar to that for the single orifice case shown in FIG. 1a. . The purpose of tube 22 is to initiate a jet at the water level in tube 3 below air inlet tube 6. This makes it possible. During operation, tube 3 is filled with dense foam up to the point of entry of the jet. so that the liquid flows with the aid of the air inlet tube 6 where the solids can settle. I can do it like that. Therefore, each liquid injection nozzle 2 is positioned below the air inlet pipe 6. suitable.

The implementation of the foam dispersion device can be emphasized in various ways based on the interfacial properties of the gas-liquid device. Ru. Bubbles flow towards outlet 5 for a stable two-phase mixture to fill vertical tube 3. It is necessary that there is little coalescence of the bubbles so that they are forced to form. When a merger occurs, Very small bubbles combine with other bubbles and grow into large bubbles, and the bubbles bridge the vertical tube 3. , resulting in the destruction of the two-phase mixture in the vertical tube.

Coalescence is caused by the presence of salts and dissolved substances, especially surfactants dissolved in the liquid, and by the presence of solid particles and oils. and is prevented or inhibited by the presence of an insoluble liquid such as grease.

Because the characteristics of each gas-liquid device are different, a single foam dispersion device is suitable in all cases. However, it may be necessary to modify the design to handle individual circumstances. I don't get it. A number of modifications are explained for effective use.

FIG. The jet is surrounded by the circular suction pipe 30, and the jet covers the entire section of the suction pipe. A configuration is shown in which the jet is expanded to occupy an area. The purpose of the suction pipe 30 is , the fluid per unit volume that guides the small bubbles into the vertical tube 3 is divided by the amount of energy consumed. to limit the volume of the gas-liquid mixture in the vicinity of the jet to enhance the It is. The diameter of the suction pipe can be set within a range of 2 to 10 times the diameter of the jet. Since then, good performance has been found in the range of 3 to 8 times the jet diameter.

The upper end of the suction pipe 30 can be provided with an opening as appropriate or the configuration can be simplified. It can be made in the form of a circular tube attached to the head of tube 3 as shown in the figure, and connected A communicating opening 31 is provided at the inlet of the liquid jet to recirculate the gas around the suction tube. It can be done in a circular manner.

In a variation of this embodiment, as shown in FIG. A hole 32 can be provided in the suction tube. The purpose of this hole is based on bubble coalescence. to allow gas to circulate back to the head space of the vertical tube 3, while at the same time Sufficient security should be provided in the evacuation tube to provide a substantial occlusion to the fluid.

Another successful embodiment is shown in FIG. The drawn suction tube is shown. The top of the suction tube is located near the outlet orifice 2; Since the upper side of the pipe 41 is sloped, it is possible to reach a point 1 space below the vertical pipe 3. The area of the tube 41 is increased. At a suitable point 42, the area of the suction tube is Once the diameter begins to decrease, the lower part 43 of the tube ends at a suitable point, and the tube outlet area remains the same. The height is greater than the cross-sectional area of the liquid jet. Initially, the cross-sectional area grows large. The purpose of this shape of the suction tube, which increases in size and then reduces its area, is to allow the bubbles to rise and avoid the jet. to allow large bubbles and gas slugs to form below the vertical pipe 3. Therefore, it is conveyed again through the inlet 45. Another form of this type of suction tube is shown in Figure 6b. , the suction pipe 44 is in sealing engagement with the inner wall of the vertical pipe 3 at its thickest point. are doing. Therefore, the large bubbles rising along the wall of the tube 3 are removed from the suction tube 44 and the vertical tube 3. An opening located immediately below the thickest part of the suction pipe 44, which is caught in the annular space between It is conveyed again through 45 rings.

Another embodiment, shown in FIG. The advantage is that the bubbles do not grow large enough to cause damage, but are more exposed to high-velocity jets. is intended to become. In this embodiment, the suction pipe 51 is located below the vertical pipe 3. The cross-sectional area first decreases as it moves toward , reaching its minimum at point 52, and below that the cross-sectional area decreases. It's grown big. The cross-sectional area of the open tube at point 52 is The annular space 53.54 must be 6 larger than the cross-sectional area of the jet. It can be formed between the tube and the inner wall of the vertical tube 3, and the suction tube can be sealingly engaged with the wall of the vertical tube 3. I can make it happen.

The dimensions of the vertical tube 3 relative to the diameter of the jet are important considerations in the operation of the foam dispersion device. It is. For sufficient operation, the diameter of the vertical tube 3 should range from 2 to 20 times the jet diameter. It has been found that sufficient operation is within the range of 3 to 12 times the jet diameter. It will be done.

In many cases, the working gas is air at atmospheric pressure, requiring a blower or compressor. It is preferred that the dispersion device be able to operate by drawing air from the atmosphere without be. This is reached when the pressure near jet orifice 2 is lower than atmospheric pressure. Can be done.

However, in other situations, compressed air may be conduited through a blower or compressor, i.e. In other words, it can be supplied to the upper part of the vertical pipe 3. This configuration allows the foam to move downward in the tube and A large water head is installed in the top of the vertical pipe 3 to exit from the lower end 5 for a pressure head of 4. It can be applied when it is required to immerse the vertical pipe 3 in the liquid 4 as much as necessary. Ru.

This publication describes one preferred embodiment of using air to "aerate" the gas. However, there are some places where liquids can be “aerated” with other gases than air. It will be clear that other gases can be used if desired.

Also, although the invention was described with respect to aeration of wastewater, it was also Removes unwanted waste materials by bringing precious minerals into contact with microscopic bubbles Suitable for flotation of mineral particles to remove valuable minerals from Particles that are required to be removed are not wetted by the liquid and are left in the liquid. Therefore, it becomes moist. Therefore, valuable particles are attached to the surface of microscopic bubbles. The mineral particles can be removed as bubbles by rising to the surface of the water along with the bubbles.

NNX T NTERNAT+NA RHRNNNANPPA 17

Claims (17)

[Claims] 1. A jet moving downward into the top of a downwardly extending conduit whose lower end is immersed in liquid. The fluid passes through the conduit as a gas, forming bubbles within the conduit, causing bubbles to move downwards and A method of aerating the liquid from the process of allowing it to enter the liquid from the end. 2. Gas is fed into the top of the conduit and transported into a jet that forms bubbles. A method according to claim 1, characterized in that: 3. The top of the conduit is closed and gas is supplied at atmospheric pressure and with flow control restrictions. 3. A method according to claim 2, characterized in that: 4. The top of the conduit is closed and pressure gas is supplied by a blower or compressor. The method according to claim 2, characterized in that: 5. The liquid passing through the top of the conduit is allowed to cooperate with the gas in the supersaturated solution in the liquid. A method according to any one of claims 1 to 4, characterized in that: 6. A conduit extending generally vertically with an open bottom end and a liquid jetted downward into the conduit. Pressure liquid into a downwardly directed nozzle at the top of the conduit to form a jet. a liquid supply device arranged to supply force and support a conduit whose lower end is immersed in the liquid a device for aerating a liquid, comprising a support device arranged to 7. The conduit has a diversion ramp extending outward from the outside of the conduit and immersed in the liquid. is provided to separate bubbles exiting from the lower end of the conduit outwardly from the conduit so that the bubbles rise through the liquid. The device according to claim 6, characterized in that it is provided with a baffle plate for scattering. . 8. A deflector plate is formed from a plate surrounding the conduit and extending upwardly and outwardly from a predetermined location on the exterior of the conduit. 8. A device according to claim 7, characterized in that it comprises: 9. The plate has multiple holes sized to allow a predetermined flow rate of bubbles to pass through each hole. 9. Device according to claim 8, characterized in that it is provided. 10. A claim characterized in that a gap is provided between the inner circumference of the plate and the duct of the conduit. The device according to any one of scope 8 or 9. 11. The diversion ring causes the bubbles to move outward and upward from the conduit onto the outer surface of the conduit below the gap. The claim is characterized in that it is provided to deflect the material away from the gap between the conduit and the plate. The device according to claim 10. 12. It has an axis parallel to the axis of the conduit and directs the flow of gas in the conduit. A suction pipe formed to suppress jets is provided inside the conduit. The apparatus according to any one of claims 6 to 11. 13. Gas moves up the conduit between the conduit and the suction tube so that it re-enters the suction tube through the hole. Claim 12, characterized in that the suction pipe has one or more holes so as to rise. The device described. 14. The suction tube has a relatively narrow upper end located adjacent to the nozzle and extends downwardly and outwardly. It is relatively wide in the middle, widens at the ends, tapers downward and inward, and tapers toward the upper end. The ribs are wide, terminating in an open lower end that is narrower than the middle part. The device according to claim 12 or 13. 15. The suction tube has a relatively wide upper end located adjacent to the nozzle and has a relatively wide upper end located adjacent to the nozzle. The narrow middle part tapers inwardly at the bottom and widens outwards at the bottom to open the lower end. Either claim 12 or 13, characterized in that: The device described. 16. The conduit is generally circular in cross section or has other cross sections with large and small horizontal axes of the same value; It has an effective diameter equal to the diameter of a circle of the same area, and the diameter of the conduit is between 2 and the diameter of the nozzle. Any one of claims 7 to 15, characterized in that it is within the range of 20 times. The device according to item 1. 17. characterized in that the diameter of the conduit is within a range of 3 to 12 times the diameter of the nozzle Apparatus according to claim 16.