• 专利附录
  • 专利说明
  • 权利要求
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    • 专利摘要:
    METHOD OF SEPARATING PARTICLES WITH LOW DENSITY OF FEEDING BOUQUETS THAT CONTAIN THESE PARTICLES AND PARTICULATING SEPARATING DEVICE WITH LOW DENSITY OF FOOD BOUQUETS In a method and apparatus for separating particles with low density of feed mixes, it is formed a mixture of bubbles in a conductor (14) that exits to an intermediate region (12) in a chamber (1). An inverted reflux classifier is formed by inclined parallel plates (6) below the intermediate region, which allows efficient separation of particles with low density that rise to form a densely packed one (16) on top of the chamber and more dense particles that fall to an outlet (29).
    公开号:BR112012030565B1
    申请号:R112012030565-4
    申请日:2011-06-02
    公开日:2020-12-22
    发明作者:Kevin Patrick Galvin
    申请人:Newcastle Innovative Limited；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    [001] The present invention relates to a method and apparatus for separating particles with low density of feed mixtures that contain these particles and was designed particularly, though not exclusively, as an improved foam flotation process applied to fine coal or fine minerals used to concentrate hydrophobic particles.
    [002] Throughout this specification, the term “low density particles” is used to designate particles that may be similar to solids, similar to liquids or similar to gases and, in all cases, less dense than the surrounding fluid which can, for example, be water. More specific examples of low density particles may include drops of oil or even bubbles of gas. BACKGROUND OF THE INVENTION
    [003] It has been proposed in the past to separate low density particles from a feed syrup by introducing the feed above a set of parallel inclined channels, where ideally the vast majority of the syrup is transported down through the channels inclined. The low density particles then escape from the flow, rising to the inclined surfaces facing downwards from the channels, being collected in the form of inverted sediment and then sliding down to the inclined channels. In this way, the low density particles are concentrated on the upper half of the device and, in turn, are related to excessive flow. This method and apparatus is described in International Patent Application No. PCT / AU2007 / 001817, entitled Method of Operating an Inclined Plate Classifier with specific reference to Figure 5 of that specification. It is described there as particles with low density and a part of the syrup is related to excessive flow by means of an excessive flow wash, while washing water is added at the top and allowed to flow down in order to remove possible contaminants . The arrangement of parallel plates that form inclined channels in the inclined plate classifier was often referred to as the “reflux classifier”.
    [004] The present invention aims to improve the operation of a reflux classifier for separating particles with low density by completely reversing the reflux classifier and providing an upper fluidization chamber at the upper end of the device. SUMMARY OF THE INVENTION
    [005] Consequently, in one aspect, the present invention provides a method of separating particles with low density from feed mixtures containing these particles, wherein said method comprises the steps of: - introducing the feed mixer into a chamber which has a substantially closed upper end and a series of inclined surfaces at the lower end; - allowing flow of the syrup down through the inclined surfaces, such that particles with low density escape from the flow by sliding the inclined faces of the inclined surfaces while the denser particles in the syrup slide down the upper faces of the surfaces inclined; - removal of the denser particles from the lower end of the chamber; - formation of an inverted fluidized bed in the chamber above the series of inclined channels; - allowing formation of particles with low density in a suspension concentrated at the upper end of the chamber; and - removing the concentrated suspension of low density particles at a controlled speed from the upper end of the chamber.
    [006] Preferably, the series of inclined surfaces is arranged to form a set of parallel inclined channels.
    [007] Preferably, the washing water is introduced under pressure at the upper end of the chamber.
    [008] Preferably, the washing water is introduced evenly through the closed upper end of the chamber.
    [009] Preferably, the concentrated suspension of particles with low density is oriented to an exit point at the upper end of the chamber, where it is removed at a controlled speed through the operation of an upper valve.
    [0010] Preferably, the denser particles are removed from the lower end of the chamber at a controlled speed through the operation of a pump or lower valve.
    [0011] Preferably, the operation of the upper valve and the lower valve or pump is controlled by measuring the suspension density at the top of the chamber and operation of the valves and / or pump to maintain the depth of low density particles within a previously determined strip at the upper end of the chamber.
    [0012] In a form of the present invention, additional fluidization is provided below the inclined channels.
    [0013] In a further aspect, the present invention provides a particle separation apparatus with low density of feed mixes, wherein said apparatus comprises: - a chamber having a substantially closed upper end and a series of inclined surfaces in the lower end; - feeding means arranged to feed syrup to the chamber; - upper control means arranged to allow the removal of concentrated suspensions of low density particles from the upper end of the chamber at controlled speed; and - lower control means arranged to allow the removal of denser particles from the lower end of the chamber below the inclined surfaces at controlled speed.
    [0014] Preferably, the substantially closed upper end of the chamber is shaped so as to direct the concentrated suspensions of low density particles towards the upper control means.
    [0015] Most preferably, the upper end of the chamber is shaped into a cone with the upper control means provided in the form of an upper valve located at the apex of the cone.
    [0016] Preferably, the lower control medium is provided in the form of a pump or lower valve.
    [0017] Preferably, the control means are operable by measuring the depth of particles with low density in the upper part of the chamber and opening or closing the upper and lower valves and / or operation of the pump to maintain the depth of particles with low density within a previously determined range.
    [0018] Preferably, the upper end of the chamber is perforated and means for supplying washing water are provided, arranged to introduce pressure washing water into the chamber through the perforations.
    [0019] Preferably, the series of inclined surfaces is arranged to form a set of parallel inclined channels.
    [0020] Preferably, the set of parallel inclined channels is formed by a set of parallel inclined plates.
    [0021] Yet another aspect of the present invention provides a method of separating particles with low density from feed mixtures containing such particles, wherein said method comprises the steps of: - introducing the feed mix down through a box feed to a chamber that has a series of sloping surfaces at the bottom end; - allowing flow of the syrup down through the inclined channels in such a way that particles with low density escape from the flow by sliding the inclined channels while the denser particles in the syrup slide down through the channels; - removal of the denser particles from the lower end of the chamber; - formation of an inverted fluidized bed in the chamber above the set of parallel inclined channels; and - allowing movement of the low density particles upwards at a controlled speed through one or more confined passages between the outer walls of the feed box and the walls of the lower flow washing chamber.
    [0022] Preferably, the feed box incorporates a series of parallel plates in close space between which the grout is fed, in which each plate has a porous spray surface through which particles with low density are passed into channels between the plates forming an emulsion or bubbling mixture, which comes out of the lower end of the supply box. In a preferred form, the sprayer generates or forms particles with a low density of a fluid such as a gas to produce air bubbles. In another preferred form, a spray-like structure, such as a membrane, can be used to form drops of a low density liquid. In a further preferred form, the spray-like structure may involve a paste-like solid that is forced through the porous material.
    [0023] Preferably, the porous plates in the supply box are in spaces close enough to form a laminar flow profile between the plates that induce high cutting speed to the bubble flow.
    [0024] Preferably, the external surfaces of the supply box are in a space sufficiently close to the upper envelope of the chamber, in order to cause restricted upward movement of particles with low density into the upper flow, which results in rapid capture of low density particles. BRIEF DESCRIPTION OF THE FIGURES
    [0025] Without considering any other forms that may fall within its scope, a preferred form of the present invention will now be described solely as an example form with reference to the accompanying figures, in which: - Fig. 1 is an elevation in diagrammatic cross section through the apparatus for separating particles with low density from feed mixtures according to the present invention; - Fig. 2 is an enlarged view of a bubble flow generator suitable for use in the apparatus shown in Fig. 1; Fig. 3 is a diagrammatic cross-sectional elevation of an alternative form of apparatus for separating particles with low density from feed mixtures according to the present invention; - Fig. 4 is an enlarged view of the bubble flow generator shown in Fig. 3; - Fig. 5 is a vertical cross section in diagram enlarged through one of the parallel inclined channels of the apparatus shown in Fig. 1, which demonstrates the movement of particles within that channel; - Fig. 6 is a diagrammatic cross-sectional elevation of the low density particle separation apparatus according to the present invention when arranged in a centrifuge device to increase the separation speed of low density particles ; and - Fig. 7 is a plan view in diagrammed cross section on the AA line in Fig. 6. DETAILED DESCRIPTION OF THE INVENTION
    [0026] The preferred form of the present invention will be described with the method and apparatus that are used for foam flotation, as typically applied to fine particles of coal and mineral material and used to concentrate hydrophobic particles of coal.
    [0027] These hydrophobic particles selectively adhere to the surface of air bubbles, leaving hydrophilic particles in suspension between the bubbles. In this way, when the hydrophobic particles are attached to the air bubbles, a new hybrid particle is formed that has an overall density much lower than the density of water. The bound hydrophobic particle has an upward segregation velocity that is very high compared to the downward surface velocity of the denser particle suspension.
    [0028] In most flotation situations, it is necessary to add certain reagents to promote flotation. A collector can be added to promote hydrophobicity of the hydrophobic charcoal particles. In particular, a surfactant (sometimes called “sparkling”) is added to stabilize the bubbles and, therefore, the foam formed as the bubbles try to get out of the liquid volume. Surfactant is adsorbed on the surface of the bubble, helping to prevent the coalescence of the bubbles and, therefore, preserving the “low density particles”. This is especially important when bubbles are forced through the upper valve.
    [0029] Conventional foam flotation is attractive because the rate of segregation of hydrophobic particles is governed by the rate at which the bubbles rise and, therefore, ultrafine particles under 100 microns can be transported at very high speeds, regardless of their size. A second main attraction of foam flotation is the “sludge removal” that is achieved when the remaining suspension is kept in drainage through the spray. In addition, by adding washing water to the free surface of the syrup at the top of the container, the suspension of hydrophilic particles can be washed, producing a cleaner foam product.
    [0030] It is well known, however, that the addition of washing water to the foam product is inefficient and not uniform and, therefore, the spray product is not as "clean" as would be preferred. If an excessive water addition speed is used, there will be a strong tendency to create an opening in the foam, which results in the passage of added water through that opening, producing little benefit. In this way, water addition speeds need to be limited to relatively low levels and need to be evenly distributed.
    [0031] A more efficient form of foam flotation can be achieved according to the present invention using the apparatus as described below with reference to Figure 1. The apparatus comprises a chamber 1 having a substantially closed upper end 2 and a lower end 3 in which a set of parallel inclined channels is located 4. The parallel inclined channels are typically formed by the inclined sides 5 of the lower end 3 of the chamber 1 and a set of parallel inclined plates 6 located parallel to the inclined walls 5, so as to form the parallel inclined channels 4.
    [0032] In this way, a "reflux classifier" is formed in the chamber, which operates according to the mechanism shown in Figure 5, in which the particles with low density 7 escape from the general flow 11, rise towards the surface downward facing plate 6A, being collected in the form of inverted sediment and then sliding through the inclined channels as shown in 9.
    [0033] The denser particles such as those typically displayed at 10 fall from the sediment movement downwards 8 towards the upward sloping surface of the plates 6B and slide down the inclined channels.
    [0034] The feed syrup is introduced into the chamber at or near the intermediate point as shown in 12 and technicians in the subject of foam flotation will appreciate that the feed for this device can be provided in a number of ways. One of these forms is the use of a vertical conductor 14 which will be described in more detail with reference to Fig. 2.
    [0035] The conductor comprises a generally vertical pipe 15 with an inner tube 22 that can be mounted at the upper end of the chamber by means of a flank 23. Gas, like air, is introduced at the upper end of the tube as shown by the arrow 24 and passes down through the tube to a spray section 25 located in the lower section of the pipe 15.
    [0036] The particle suspension can be introduced through the side entrance 26 as shown by the arrow 27, where it passes to the pipe 15 to find the gas bubbles coming out of the spray section 25. As there is a relatively narrow ring 26 between the section spray nozzle 25 and the pipe wall 15, a high cutting speed is introduced into the flow of the ring 26, which results in a well-mixed bubble flow leaving the upper end of the conductor at 28.
    [0037] The upper end of chamber 1 is shaped to direct the concentrated suspensions 16 of particles with low density towards an upper outlet 13. This is typically achieved by shaping the upper end of the chamber in the form of a cone 17 with the upper outlet 13 located at the apex of the cone, as can be seen in Figure 1.
    [0038] The cone is preferably perforated in such a way that the washing water can be introduced into the upper end of the chamber at 18 under pressure and forced through perforations in the cone 17 in a uniform manner for the concentrated suspension 16 of particles with low density. When the top of the foam is closed in this way, which occurs when using a fluidization zone, the foam is completely contained and does not have the degree of freedom to flow out of the added water. The foam is forced to bond with the wash water and distribute that wash water more evenly. In addition, since the foam is only free to leave the system by means of a central overflow pipe 19 with small cross section, the foam is forced to accelerate towards outlet 13 regardless of the addition of washing water downwards.
    [0039] In the present invention, the rising foam is forced out through a narrow opening at the top of the device. When a foam is forced through a restraint, it tends to accelerate and also to stabilize. The foam that emerges from the smaller opening will sometimes appear more refined, with smaller air bubbles. Considering the higher transport speed of the foam, any particle loss from a gas bubble interface is easily recovered by air bubbles rising from below and, therefore, hydrophobic particles will not tend to be lost from the foam product.
    [0040] Furthermore, in the present invention, there is an opportunity to force much more wash water down through the top of the container. This has the effect of preventing foaming. In fact, a fluidized bed of bubbles will tend to form, with significant amounts of clean water moving freely downward between the rising air bubbles. In this way, the hydrophilic particles can be completely removed by washing. This is especially significant in applications involving large amounts of fine clays in the carbon foam flotation. Removing these clays is an important challenge in the industry, especially with seams that lead to high clay content. Unless these clays can be removed, it becomes impossible to produce a clean product that meets the needs of the coal markets.
    [0041] An inverted fluidized bed is decidedly the only way to achieve the goal of high sludge removal in foam flotation. Although fluidized beds may have been used in the past to fluidize particles less dense than the fluid, they were not used in the context of foam flotation and were not used to improve sludge removal during flotation.
    [0042] The inverted fluidized bed is reached in the present device by removing the "free surface" commonly seen in foam flotation devices. Free surfaces of this type make it difficult to efficiently connect the washing water without the formation of channels or holes in the foam.
    [0043] At the base of chamber 1, it is also possible to provide an additional fluidization chamber 20. Fluidification near the base provides a means of assisting particles that would otherwise settle on the base of the container for easier discharge through the exit.
    [0044] It is further observed that the vast majority of the volumetric flow would normally tend to discharge out of the bottom of the container. In this way, the system would operate efficiently under diluted conditions and, therefore, there would be a good distribution of this flow throughout all the inclined channels. Higher system concentrations may also be used.
    [0045] It is also observed that the device would be operated efficiently at higher feed and gas speeds than those used in a conventional foam flotation device and would be operated at higher wash water speeds. These higher speeds are made possible by the powerful effect of the inclined channels at the bottom of the system. These channels provide an increase in the effective container area, allowing bubbles of gas that would otherwise be trapped further down in the lower flow to rise towards the upper flow.
    [0046] In an additional variation, it is possible to make the gaps between the inclined channels at the exit of the inclined channels narrower. This would have the effect of increasing the pressure drop through the inclined channels and, therefore, forcing a more even flow through each of the inclined channels. This gap reduction would be better formed by a funnel, so that an abrupt blockage of the sediment does not occur. The narrowing would only be at the bottom of the inclined channels.
    [0047] An alternative arrangement shown in Fig. 3 is designed for high volumetric feed speeds and low concentrations of solids or low feed degrees. In this arrangement, the feed syrup is fed to chamber 1 through a feed box 30 which will be described in more detail below with reference to Fig. 4. The flow of bubbles is emitted from the lower end 31 of the feed box 30 to chamber 1 as previously described and the rising gas bubbles with attached hydrophobic particles rise over either side 32 of the supply box 31 until they cause overflow at the upper end of the chamber at 33 for a flush 34 for flushing as shown at 35.
    [0048] Turning now to Fig. 4, it can be seen that the feed syrup introduced in 36 flows downwards through a system of parallel plates with little spacing 37 that are vertically aligned as shown in Fig. 4, but that can be tilted if desired. The plates 37 are hollow and covered with a porous material. The gas supply shown in diagram form at 38 is fed to the plate in a controlled manner, in such a way that fine bubbles with a diameter of the order of 0.3 mm arise from the porous sections of each plate and interact with the hydrophobic particles. Hydrophobic particles attached to the air bubbles are captured downwards through vertical channels 39 and are then captured upwards through the narrow passages 40 between the supply box 30 and the outer container wall 41. The bubbles and fixed particles then progress for washing product overflow 34 as shown in Fig. 3.
    [0049] It will be appreciated that the embodiments of Figures 3 and 4 apply equally when the particles with low density are drops of oil in an emulsion, instead of gas bubbles in a mixture of bubbles.
    [0050] The advantage of a supply box as shown in Fig. 4 is the fact that a precise laminar flow field is formed in each channel 39 as shown in diagram form by the laminar flow profile 42. The flow field blade has a high cutting speed in the range from 10 s-1 to 1000 s-1. This high cutting speed is achieved by the laminar flow as shown by the profile 42 which allows to achieve a high flow rate of bubble mixture at the outlet of the feed box 30.
    [0051] The objective is the recovery of all hydrophobic particles and, in this case, some hydrophilic particles captured in the final product can be anticipated. In this arrangement, foaming is not essential. There are benefits to not needing to maintain or control the foam, as the foams can have highly variable stability.
    [0052] In a further enhancement of the present invention, the speed of separation of particles with low density (oil droplets, hollow particles, bubbles etc.) can be increased by submitting an inverted reflux classifier of the type displayed in any of the Fig. 1 or Fig. 3 to centrifugal forces. This arrangement is shown in Figs. 6 and 7.
    [0053] Several chambers of this type shown at 1 in Fig. 1 or Fig. 3 can be arranged generally flat but inclined, as shown in 43, supported by arms 43A extending radially outwardly from a center 44 Any appropriate number of boxes 43 can be selected, but, in the arrangement clearly seen in Fig. 7, there are eight boxes together like the spokes of a wheel and extending outward from the octagonal center 44.
    [0054] The feed syrup is fed through a central hollow axis 45, as shown by arrow 46, from where it feeds out through the radial pipes 51 to the entry points 48 in boxes 43.
    [0055] Fluidizing wash water can be fed in a similar way through ring 49 as shown by arrow 50 and therefore through pipes 47 to the head area of each box 43 and therefore out through the cones perforated 17 arranged in a similar manner as described previously with reference to Fig. 1.
    [0056] Each inclined box 43 is equipped with inclined channels 52 that act similarly to the channels 4 shown in Fig. 1.
    [0057] In practice, the device is rotated at an appropriate speed around a bearing 53 to provide a higher gravitational field inside the boxes 43 which are subjected to centrifugal forces. The low density particles report to the inner ends 54 of the boxes 43, where they can be discharged through valves 55 and the upper flow can flow downwards as shown by the arrows 56 so that it is collected at the bottom of a neighboring chamber 57, where they can be discharged via an outlet 58 in the form of an upper flow in the arrow 59.
    [0058] The lower flow containing hydrophilic particles denser than the fluid reports to the outer ends 60 of the inclined boxes 43, where it is discharged in 61 and collected by means of a lower flow channel 62.
    [0059] The fluidizing water that enters 50 is used to help clean the product with low density of so-called "sludge".
    [0060] The parallel plates in the boxes 43 are typically aligned at an angle of 70 ° to the center 44 and, therefore, 20 ° to the centrifugal force and are used to retain particles with low density inside the internal section of the device, allowing that liquid and other contaminants, such as sludge, are discharged to the lower flow through the outer section of the device.
    [0061] By these means, the present invention provides a new technology of recovery and concentration of particles with low density, in which the density of particles is less than the fluid, such as water. The arrangement is shown in Figure 1. In fact, the Reflux Classifier is completely inverted, in order to provide an upper fluidization chamber 21 on top of the device, connected to a vertical section and then a section consisting of channels parallel inclined. At the base itself, there is the additional option of also including a fluidization section, in order to assist with the discharge of the syrup from the base and avoid the accumulation of the denser particles that may also be present in the feed.
    [0062] Thus, the concept of an inverted fluidized bed for particle separation, especially particles less dense than the fluid of particles more dense than the fluid, is proposed in the present. The inverted arrangement allows the addition of pressure wash water, which allows higher surface speeds of wash water to be forced back down the zone of low density particles that are concentrated in the upper vertical section of the device. The concentrated suspension of low density particles is then forced to move inward at the top and, in turn, passes through a central exit point. A valve 13 at the outlet point controls the discharge speed with reference to a suspension density measured in the upper vertical section.
    权利要求:
    Claims (19)
    [0001]
    1. PARTICLE SEPARATION DEVICE WITH LOW DENSITY OF FOOD BOUQUETS, characterized by the said apparatus comprising: - a chamber (1) with an upper end (2) and a lower end (3); - a plurality of inclined channels (4) located at the lower end (3); - a conductor (14, 30) having a discharge end (28, 31) at least adjacent to the upper end (2) of the chamber and a feed syrup (26, 36) is arranged to feed a syrup to the conductor; and - a control device (13, 29, 34) arranged to allow particles to be removed from the chamber at a controlled rate, characterized in that: the conductor (14, 30) additionally comprises a hollow inner tube (22) or a plate hollow (37) to feed the gas into the conductor, so that the gas and grout discharge from the discharge end of the conductor into the chamber.
    [0002]
    2. Apparatus according to claim 1, characterized in that the hollow inner tube (22) is positioned axially inside the conductor (14).
    [0003]
    APPLIANCE, according to claim 2, characterized in that the hollow inner tube (22) comprises a porous surface that allows the gas and the syrup to mix inside the conductor.
    [0004]
    4. Apparatus according to claim 2, characterized in that the hollow inner tube comprises a spray-type structure, preferably a spray section (25) positioned adjacent to the bottom of at least one hollow inner tube.
    [0005]
    Apparatus according to any one of claims 2 to 4, characterized in that the hollow inner tube has an upper end (24) and the gas is fed into this upper end.
    [0006]
    6. Apparatus according to any one of claims 1 to 5, characterized in that the conductor has a feed inlet and the feed medium for the syrup in the feed inlet.
    [0007]
    7. APPLIANCE according to claim 1, characterized in that the conductor comprises: - a supply box (30) having an upper feed end arranged to receive the feed syrup and a lower end arranged to discharge the bubbling flow at the end top of the chamber; - the supply box further comprising a plurality of parallel hollow porous plates (37) having an inlet and an outlet end; and wherein the gas supply (38) is arranged to feed the gas at the inlet end of at least one of the hollow porous plates forming a mixture of syrup and gas adjacent to the outlet end of the parallel hollow porous plates.
    [0008]
    Apparatus according to any one of claims 1 to 7, characterized in that the discharge end (28, 31) of the conductor extends towards the upper end (2) of the chamber (1).
    [0009]
    Apparatus according to any one of claims 1 to 8, characterized in that the control device comprises an upper control device (13, 34) located at the upper end of the chamber and a lower control device (29) located at the lower end the chamber; wherein the upper control device is arranged to allow concentrated suspensions of low density particles to be removed from the upper end of the chamber at a controlled rate; and wherein the lower control device is arranged to allow denser particles to be removed from the lower end of the chamber below the inclined channels at a controlled rate.
    [0010]
    Apparatus according to any one of claims 1 to 9, characterized in that the parallel channels (4) are formed by a plurality of parallel plates (6), preferably the parallel channels are at an angle to the upper end (2) of the chamber and, more preferably, the lower end (3) of the chamber is at the same angle as the channels parallel to the upper end of the chamber.
    [0011]
    11. Apparatus according to any one of claims 1 to 10, characterized in that the upper end (2) of the chamber is shaped to direct the concentrated suspensions of low density particles towards the upper control device (13), preferably at upper end of the chamber be shaped like a cone (17) with the upper control device provided in the form of a restricted outlet (13) located at the apex of the cone.
    [0012]
    Apparatus according to any one of claims 1 to 11, characterized in that it additionally includes a washing water supply means (18) disposed adjacent the upper end (2) of the chamber for introducing pressure washing water into the chamber.
    [0013]
    13. Apparatus according to any one of claims 1 to 12, characterized in that it further comprises a fluidization chamber (21) positioned adjacent the upper end of the chamber to direct a fluidized flow downwards to form an inverted fluidized bed above the inclined channels, preferably with the upper end of the chamber closed.
    [0014]
    14. APPLIANCE according to any one of claims 1 to 13, characterized in that the plurality of said boxes (43) are arranged to extend radially outwardly from a central axis (44) which is adapted to be rotated in use, forming an improved gravitational field within each chamber.
    [0015]
    15. METHOD OF SEPARATING PARTICLES WITH LOW DENSITY OF FOOD SOURCES THAT CONTAIN THESE PARTICLES, characterized by the aforementioned method comprising the steps of: - introducing the food syrup into a chamber (1) that has an upper end (2) and a top plurality of inclined channels (4) at the lower end (3), in which the feed syrup is introduced through a feed medium (26, 36) arranged to feed the feed syrup into a conductor (14, 30) with a discharge end (28, 31) at least adjacent to the upper end of the chamber; - supply of gas to the conductor through a hollow inner tube (22) or a hollow plate (37), so that the gas and the grout are discharged from the discharge end of the conductor into the chamber; - allowing flow of the syrup down through the inclined channels in such a way that particles with low density escape from the flow by sliding the inclined channels while the denser particles in the syrup slide down through the channels; - removal of the denser particles from the lower end of the chamber; - allowing formation of particles with low density in a suspension concentrated at the upper end of the chamber; and - removing the concentrated suspension of low density particles at a controlled rate from the upper end of the chamber.
    [0016]
    16. METHOD, according to claim 15, characterized in that the gas and the syrup form a downward fluidizing flow towards the inclined channels, preferably above the inclined channels and more preferably form an inverted fluidized bed in the chamber above the inclined channels.
    [0017]
    17. METHOD, according to claim 15, characterized in that the washing water is introduced under pressure at the upper end of the chamber, preferably evenly through a closed upper end of the chamber.
    [0018]
    18. METHOD according to any one of claims 15 to 17, characterized in that the feed syrup is introduced into the chamber through the conductor (14) extending downwards through the chamber to an area above the inclined parallel channels (4), the conductor incorporating a sprayer (25) arranged to provide a bubbling flow of the feed paste.
    [0019]
    19. METHOD according to either of claims 15 or 16, characterized in that the conductor comprises a supply box (30) which incorporates a plurality of parallel plates (37) between which the supply syrup is fed, each plate having a porous spray surface through which low density particles are passed into the channels between the plates forming a bubbling mixture or emulsion, which emits from the lower end of the feed box, preferably the porous plates in the feed box being spaced to form a laminar flow profile between the plates, inducing a high cut rate in the bubbling flow.
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    AU2011261162A1|2013-01-10|
    EP2576070A4|2017-10-18|
    EA202090154A3|2020-07-31|
    PE20130963A1|2013-09-19|
    CN103002987A|2013-03-27|
    EA201291377A1|2013-06-28|
    AU2011261162B2|2014-07-17|
    CA2801380C|2018-06-19|
    EP2576070B1|2021-07-07|
    EA202190283A3|2021-08-31|
    EP2576070A1|2013-04-10|
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    CN103002987B|2015-04-22|
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    法律状态:
    2018-12-26| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-04-28| B07A| Application suspended after technical examination (opinion) [chapter 7.1 patent gazette]|
    2020-10-13| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-12-22| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 02/06/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    AU2010902439A|AU2010902439A0|2010-06-03|Method and apparatus for separating low density particles from feed slurries|
    AU2010902439|2010-06-03|
    PCT/AU2011/000682|WO2011150455A1|2010-06-03|2011-06-02|Method and apparatus for separating low density particles from feed slurries|
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