Specific gravity separation device

Abstract

Provided is a specific gravity separation device capable of efficiently separating and recovering a high specific gravity object from an object to be separated, and capable of recovering at a high recovery rate by suppressing the amount of a low specific gravity object mixed into the recovered high specific gravity object. The specific gravity separation device has a conical drum into which an object to be separated is introduced from the upper end side, performs specific gravity separation by using separation action water supplied from a discharge pipe connected to the lower end side, discharges a low specific gravity object from the upper end of the conical drum, and recovers a high specific gravity object from the discharge pipe. A stirring blade for stirring the object to be separated along with the rotation of the conical drum is vertically arranged on the inner wall of the conical drum.

Description

Technical Field

[0001] This invention relates to a gravity separation device that uses the difference in specific gravity to separate granular objects, for example, to a technique for separating and recovering valuable metals from waste molten slag and the like. Background Technology

[0002] Using municipal solid waste incineration ash, shredder dust, and landfill waste from industrial waste as raw materials, the molten slag produced after melting in a furnace contains valuable metals such as gold, silver, copper, platinum, and palladium. If these valuable metals can be separated and recovered from the molten slag, resource recycling can be achieved. On the other hand, when using the crushed slag from molten slag as aggregate for civil engineering or as raw material for kiln operations, if valuable metals and other metals that are impurities can be separated and recovered in the preceding stages, more efficient resource recycling of the molten slag can be achieved.

[0003] Patent Document 1 discloses a specific gravity separation device comprising: a rotating body that rotates about a rotation axis inclined at a predetermined angle relative to the horizontal and forms a cylindrical body with a conical portion; a discharge section that is connected to a small-diameter opening formed at the top of the conical portion located at the lower end of the rotating body; and a separation object input section that is inserted into the rotating body from the large-diameter opening at the upper end of the rotating body, with the top opening facing the top of the conical portion; the discharge section is connected to a water supply unit at the opposite end connected to the small-diameter opening, the water supply unit supplying water for separation, and a separation object discharge unit connected midway to discharge the separated object.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2003-211019 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] For example, the above-mentioned gravity separation device is suitable for use in cases where the granular object to be separated is a mixture of waste molten slag and metals with relatively high specific gravity and slag with relatively low specific gravity.

[0009] exist Figure 13AThe diagram illustrates the relationship between the amount of material fed into the gravity separator and the recovery rate of metals. Increasing the amount of material fed into the gravity separator reduces separation efficiency and increases the tendency for metals to be discharged through the large-diameter opening along with the slag during separation, thus leading to a decrease in metal recovery. Conversely, decreasing the amount of material fed into the gravity separator increases metal recovery, but the separation time becomes longer.

[0010] Furthermore, suppressing the water flow during separation increases the recovery rate of metals, but also increases the amount of slag mixed into the recovered metals, leading to a higher impurity concentration. When the impurity concentration increases, the revenue from selling the recovered valuable metals decreases. Conversely, increasing the water flow during separation decreases the impurity concentration, but reduces the metal recovery rate.

[0011] Even if the object to be separated is particulate matter other than a mixture of slag and metal, the above tendency will not change. For example, the particulate matter obtained from crushing waste rock after mineral beneficiation in a mine is used as the object to be separated and recovered in trace amounts.

[0012] The purpose of this invention is to provide a specific gravity separation device that can efficiently separate and recover high specific gravity substances from the object to be separated, and suppress the amount of low specific gravity substances mixed into the recovered high specific gravity substances, thereby enabling recovery with a high recovery rate.

[0013] Technical means to solve the problem

[0014] To achieve the above objectives, the first characteristic structure of the specific gravity separation device of the present invention is that... The specific gravity separation device includes: a conical drum supported for rotation about an inclined axis, with a small-diameter opening at the lower end and a large-diameter opening at the upper end; an input section for feeding granular materials to be separated into the conical drum; and a discharge pipe configured in an inclined position, with its upper end connected to the small-diameter opening. While the conical drum is rotating, separation water is supplied to the conical drum from the discharge pipe to recover high-specific-gravity materials contained in the materials flowing from the small-diameter opening to the discharge pipe against the flow of the separation water, and low-specific-gravity materials contained in the materials are discharged and recovered together with the separation water from the large-diameter opening of the conical drum. Stirring blades that agitate the materials to be separated as the conical drum rotates are erected on the inner wall of the conical drum.

[0015] The material to be separated, fed into the conical drum from the inlet, is immersed in the separation water supplied from the outlet pipe. As the conical drum rotates, it is agitated, resulting in gravity separation. The lighter material, along with the separation water, is discharged through the larger diameter opening. The heavier material flowing into the outlet pipe overcomes the flow of the separation water and is recovered. Because agitator blades are installed on the inner wall of the conical drum, even when a large quantity of material is supplied and moves densely towards the smaller diameter opening, the heavier and lighter materials are efficiently agitated by the blades as the drum rotates. This increases their contact with the separation water. Furthermore, the difference in falling velocity between the heavier and lighter materials as they fall through the water, caused by the agitator blades, facilitates gravity separation and promotes the movement of the lighter material towards the larger diameter opening.

[0016] The second feature is that, in addition to the first feature, the stirring blades are provided with a plurality of blades along the circumference of the conical drum.

[0017] As the conical drum rotates, the densely packed objects to be separated are repeatedly scraped circumferentially by the mixing blades, thus promoting the movement of low-density objects toward the side of the large-diameter opening and promoting the movement of high-density objects toward the side of the small-diameter opening.

[0018] The third feature is that, in addition to the first feature described above, the stirring blades are erected extending along the axial direction of the conical drum from the small diameter opening to the large diameter opening.

[0019] By using stirring blades that extend from the small diameter opening to the large diameter opening and along the axial direction of the conical drum, the material to be separated, which moves along the axial direction of the conical drum, is continuously stirred, thereby ensuring sufficient opportunity for gravity separation.

[0020] The fourth feature is that, in addition to the third feature described above, the stirring blades are intermittently erected in the axial direction.

[0021] Because the stirring blades are intermittently erected in the axial direction, the stirring state changes at the discontinuous parts, thereby further improving the stirring effect.

[0022] The fifth feature is that, in addition to the third feature described above, the stirring blades are positioned in a radial orientation along the conical drum, or in an inclined orientation at a predetermined angle to the radial direction.

[0023] The stirring blades, which extend along the axial direction of the conical drum, are positioned in a radial orientation or at an angle to the radial direction. Therefore, as the conical drum rotates, the material to be separated, which is received by the surface of the stirring blades, is stirred efficiently.

[0024] The sixth feature structure is that, in addition to the first feature structure described above, it has a separation water supply section, which branches downward from the discharge pipe to a high specific gravity recovery pipe for recovering the high specific gravity material, and supplies the separation water to the lower end of the discharge pipe and / or the high specific gravity recovery pipe.

[0025] High-density materials flowing out of the discharge pipe overcome the flow of the separating water and are collected by the high-density material recovery pipe. Separating water is supplied from the lower end of the discharge pipe to the conical drum, resulting in efficient gravity separation inside the discharge pipe. Furthermore, the supply of separating water to the high-density material recovery pipe effectively suppresses the flow of low-density materials into the high-density material recovery pipe.

[0026] The seventh feature structure is that, in addition to the first feature structure described above, at least a portion of the discharge pipe is provided with a horizontally elongated section whose inner cross-sectional shape is horizontally elongated, and a high-density material recovery pipe for recycling the high-density material is branched downward from the horizontally elongated section, and the separation water is supplied from a first water supply section located at a position lower than the branched portion of the high-density material recovery pipe.

[0027] The material to be separated, fed into the conical drum from the input section, is immersed in the separation water supplied from the discharge pipe. As the conical drum rotates, it is agitated, resulting in gravity separation. The high-density material is recovered in the high-density material recovery pipe via the discharge pipe, while the low-density material, along with the separation water, is discharged from the large-diameter opening. If the high-density material and a portion of the low-density material overcome the flow of the separation water and flow densely into the discharge pipe, a thin layer will form in the horizontal section and flow down. At this time, the separation water supplied from the first water supply section flows from the horizontal section to the conical drum. The low-density material, due to its thin layer, has increased contact with the separation water and is efficiently pushed back towards the conical drum, while the high-density material overcomes the flow of the separation water and flows towards the horizontal section, where it is recovered by the high-density material recovery pipe.

[0028] The eighth feature structure is that, in addition to the seventh feature structure mentioned above, the inner cross-sectional shape of the transverse portion is any one of a rectangle, trapezoid, ellipse, semicircle, or semi-cylindrical shape.

[0029] If the material to be separated flows down the discharge pipe from the conical roller in a dense state, even if gravity separation is difficult due to the flow of the separating water, the material can be laterally dispersed into a thin layer by forming a transverse section on the discharge pipe, thereby increasing the contact opportunity between the separating water and the material. Therefore, the inner cross-sectional shape of the transverse section is preferably any one of a rectangle, trapezoid, ellipse, semicircle, or semi-cylindrical shape.

[0030] The ninth feature structure is that, in addition to the seventh feature structure mentioned above, the inner bottom surface of the transverse portion is formed flat.

[0031] If the inner bottom surface of the horizontal section is formed flat, the layer thickness of the separation object flowing into the horizontal section becomes thinner evenly, thus enabling equal separation by specific gravity.

[0032] The tenth feature is that, in addition to the seventh feature described above, the transverse portion and the high-density material recovery tube are formed of light-transmitting components.

[0033] The transverse section and the high-density material recovery pipe are formed by light-transmitting components, allowing for visual confirmation of whether the separated objects are well separated, and thus enabling appropriate adjustment of the water supply for the separation process.

[0034] The eleventh feature is that, in addition to the first feature described above, a narrowed annular weir is formed on the upper end side of the conical roller.

[0035] The material to be separated, fed into the conical drum from the input section, is immersed in the separation water supplied from the discharge pipe. As the conical drum rotates, it is agitated, resulting in gravity separation. The lighter material, along with the separation water, is discharged through the large-diameter opening. The heavier material flowing into the discharge pipe overcomes the flow of the separation water and is recovered. Even if heavier material is mixed with lighter material discharged through the large-diameter opening along with the separation water, a narrowed annular weir formed on the upper side of the conical drum prevents the heavier material from being directly discharged. The weir catches the heavier material, ensuring further gravity separation occurs inside the weir, thus allowing only the lighter material to be discharged over the weir.

[0036] The twelfth feature is that, in addition to the first feature described above, a fluid jetting mechanism is provided, which jets fluid from the inside of the conical roller toward the small-diameter opening or the vicinity of the small-diameter opening.

[0037] The material to be separated, fed into the conical drum from the input section, is immersed in separation water supplied from the discharge pipe. As the conical drum rotates, it is agitated, resulting in gravity separation. The lighter material, along with the separation water, is discharged through the larger diameter opening. The heavier material flowing into the discharge pipe overcomes the flow of the separation water and is recovered. Even when a large quantity of material is fed into the conical drum and moves densely towards the smaller diameter opening, the concentrated material is dispersed by a fluid jetting mechanism that sprays fluid from the inside of the conical drum towards or near the smaller diameter opening. This increases the contact opportunity with the separation water, thereby efficiently performing gravity separation and promoting the movement of lighter material towards the larger diameter opening.

[0038] The thirteenth feature is that, in addition to the twelfth feature described above, the fluid is a gas or a liquid.

[0039] As a fluid for dispersing densely packed objects, gases or liquids can be used. Examples include compressed air or high-pressure water.

[0040] Invention Effects

[0041] As described above, according to the present invention, a specific gravity separation device can be provided that can efficiently separate and recover high specific gravity substances from the object to be separated, and can suppress the amount of low specific gravity substances mixed in with the recovered high specific gravity substances, thereby achieving recovery with a high recovery rate. Attached Figure Description

[0042] Figure 1A This is a top view showing the specific gravity separation device of the present invention.

[0043] Figure 1B This is a front view showing the specific gravity separation device of the present invention.

[0044] Figure 1C This is a right-side view showing the specific gravity separation device of the present invention.

[0045] Figure 2A This is a bottom view of the main part of the conical roller.

[0046] Figure 2B This is a longitudinal sectional view of the main part of the conical roller.

[0047] Figure 2C This is a top view of the baffle installed inside the conical roller.

[0048] Figure 2D This is a longitudinal sectional view of the main part of a conical roller with two baffles of different diameters installed.

[0049] Figure 3A It is a longitudinal sectional view of a conical drum with stirring blades.

[0050] Figure 3B This is a top view of a conical drum with stirring blades.

[0051] Figure 4 It is a longitudinal sectional view of a conical roller with a weir.

[0052] Figure 5 It is a longitudinal sectional view of a conical roller with a fluid jetting mechanism.

[0053] Figure 6A This is a left-side view showing the precision separation section.

[0054] Figure 6B This is a longitudinal sectional view showing the precision separation section.

[0055] Figure 6C This is a right-side view showing the precision separation section.

[0056] Figure 6D yes Figure 6B A sectional view along line AA.

[0057] Figure 6E This is a bottom view showing the precision separation section.

[0058] Figure 7A This is a top view showing a spacer assembled into a precision separation section.

[0059] Figure 7B This is a side view showing a spacer assembled into a precision separation section.

[0060] Figure 7C This is a front view showing a spacer assembled into a precision separation section.

[0061] Figure 7D This is a top view showing another spacer assembled into the precision separation section.

[0062] Figure 7E This is a side view showing another spacer assembled into the precision separation section.

[0063] Figure 7F This is a front view showing another spacer assembled into the precision separation section.

[0064] Figure 8A This is an illustration of the separation mechanism of the target material by a gravity separation device.

[0065] Figure 8B This is an explanatory diagram of the separation mechanism of the precision separation section.

[0066] Figure 9AThis is an explanatory diagram showing the cross-sectional shape of the transverse portion in another embodiment.

[0067] Figure 9B This is an explanatory diagram showing the cross-sectional shape of the transverse portion in another embodiment.

[0068] Figure 9C This is an explanatory diagram showing the cross-sectional shape of the transverse portion in another embodiment.

[0069] Figure 9D This is an explanatory diagram showing the cross-sectional shape of the transverse portion in another embodiment.

[0070] Figure 10A This is an explanatory diagram showing the stirring blades in another embodiment.

[0071] Figure 10B This is an explanatory diagram showing the stirring blades in another embodiment.

[0072] Figure 10C This is an explanatory diagram showing the stirring blades in another embodiment.

[0073] Figure 11A This is an explanatory diagram showing another embodiment of the weir.

[0074] Figure 11B This is an explanatory diagram showing another embodiment of the weir.

[0075] Figure 12 This is an explanatory diagram showing the main part of a conical roller according to another embodiment.

[0076] Figure 13A This is an illustrative diagram illustrating the relationship between the amount of slag input and the metal recovery rate based on existing gravity separation devices.

[0077] Figure 13B This is an explanatory diagram illustrating the relationship between the amount of slag fed into the gravity separation device based on the present invention and the metal recovery rate.

[0078] Figure 14A This is a bottom view of the main part of the conical roller.

[0079] Figure 14B This is a longitudinal sectional view of the main part of the conical roller.

[0080] Figure 14C This is a top view of the baffle installed inside the conical roller.

[0081] Figure 14D This is a longitudinal sectional view of the main part of a conical roller with two baffles of different diameters installed.

[0082] Figure 15AIt is a longitudinal sectional view of a conical drum with stirring blades.

[0083] Figure 15B This is a top view of a conical drum with stirring blades.

[0084] Figure 16A It is a longitudinal sectional view of a conical roller with a weir.

[0085] Figure 16B It is a top view of a conical roller with a weir.

[0086] Figure 17 It is a longitudinal sectional view of a conical roller with a fluid jetting mechanism. Detailed Implementation

[0087] Hereinafter, embodiments of the specific gravity separation device of the present invention will be described.

[0088] exist Figure 1A , Figure 1B , Figure 1C The overall structure of the gravity separation device 1 is shown in the figure. Figure 8A The main parts of the gravity separation device 1 are shown in the figure. In this embodiment, the case in which the object to be separated by the gravity separation device 1 is the crushed material of molten slag containing valuable metals, is described. However, there is no particular limitation as long as the object to be separated is a granular material with a different specific gravity.

[0089] The specific gravity separation device 1 includes: a conical drum 2, with a small-diameter opening 2A at its lower end and a large-diameter opening 2B at its upper end; and an infeed section 3, through which granular materials to be separated (in the drum) are fed from the large-diameter opening 2B. Figure 8A The system comprises a pipe body (with black circles indicating high-density materials and white circles indicating low-density materials) that is fed into the system along with water; and a discharge pipe 4, the upper end of which is connected to a small-diameter opening 2A via a bearing 40 and a rotary joint 41, supplying separation water from the lower end. Additionally, it includes a discharge hopper 9 for receiving low-density materials discharged from the large-diameter opening 2B along with the separation water.

[0090] The specific gravity separation device 1 is mounted on a frame F that is rotatably supported on a generally rectangular platform MP about a horizontal axis P1. The frame F is fixed at a predetermined angle θ relative to the platform MP, thereby arranging the conical roller 2 and the discharge pipe 4 on an inclined axis P2 at the predetermined angle θ. The appropriate range of the predetermined angle θ is appropriately set according to the properties of the object to be separated, the flow rate of the separating water, etc. In this embodiment, it is set to an inclination angle of 35 ± 5 degrees relative to the horizontal line. Furthermore, in this embodiment, the conical roller 2 and the discharge pipe 4 are arranged on the inclined axis P2 via a rotary joint 41, but they can also be arranged such that the axes of the conical roller 2 and the discharge pipe 4 are inclined at different angles.

[0091] A conical roller 2 is rotatably supported on a frame F about an inclined axis P2. An electromagnetic motor M that drives the conical roller 2 is mounted on the frame F, and a pair of idle rollers R that rotatably support the conical roller 2 are mounted on the frame F. A sprocket mounted on the output shaft of the electromagnetic motor M and a sprocket mounted on the inner ring side of the bearing 40 located on the small diameter opening 2A side of the conical roller 2 are connected by a chain drive.

[0092] The conical roller 2 is formed by flange connection of a first roller 21 with a large diameter opening 2B and a second roller 22 with a small diameter opening 2A, and a cylindrical portion 20 is formed at the top of the first roller 21.

[0093] A precision separation section 42 is located downstream of the rotary joint 41 in the discharge pipe 4. This precision separation section 42 has a horizontally elongated section 42A with an inner cross-sectional shape that is horizontally elongated. A high-density material recovery pipe 43 branches downward from the precision separation section 42. At the lower end of the precision separation section 42, a first water supply section 51 is connected via a first valve mechanism V1, and separation water is supplied from the first water supply section 51 to the discharge pipe 4.

[0094] A high-density material storage section 44 is connected to the high-density material recovery pipe 43. This high-density material storage section 44 has a third valve mechanism V3 and a fourth valve mechanism V4 at both ends. Furthermore, a second water supply section 52 is connected above the high-density material storage section 44 via a second valve mechanism V2, supplying separation water to the discharge pipe 4 from the second water supply section 52. The precision separation section 42, the high-density material recovery pipe 43, and the high-density material storage section 44 are made of transparent acrylic resin tubes, allowing for visual observation of their interiors.

[0095] exist Figure 2A The image shows the first roller 21 and the cylindrical portion 20 as viewed from the opposite side of the large-diameter opening 2B. Figure 2B The diagram shows a cross-section of the first roller 21 and the cylindrical portion 20.

[0096] In the conical roller 2, multiple separation promoting mechanisms are provided to efficiently separate the objects by specific gravity. These are explained in detail below.

[0097] [First Separation Promotion Agency]

[0098] like Figure 2D As shown, inside the first roller 21, as Figure 2CAs shown, two annular plates 24 and 25 of different diameters are arranged parallel to each other along the axis P2 at a predetermined interval. Between the outer periphery of each plate 24 and 25 and the inner circumferential surface of the first roller 21, a gap is formed between the outer periphery of each plate 24 and 25 and the inner circumferential surface of the first roller 21 by mounting portions 26 formed at three locations on the outer periphery of each plate 24 and 25, thus forming a passage for separating objects.

[0099] When the material to be separated, fed from the input section 3, flows in a concentrated state toward the large-diameter opening 2B with the help of the separating water, it is received and stirred by the circular plates 24 and 25. After gravity separation is achieved, the lighter material mainly flows toward the large-diameter opening 2B through the gaps formed between the outer edges of the circular plates 24 and 25 and the inner wall of the first roller 21. The circular plates 24 and 25 act as baffles, functioning as the first separation promoting mechanism.

[0100] [Second Separation Promotion Agency]

[0101] like Figure 3A , Figure 3B and Figure 8A As shown, stirring blades 6 are erected on the inner walls of the first drum 21 and the second drum 22. These stirring blades 6 stir and separate the object as the conical drum 2 rotates. In this example, when viewed from the axis P2 of the conical drum 2, the stirring blades 6 are arranged at 90-degree intervals around the axis P2 along the circumference of the conical drum 2, and the four flat rectangular stirring blades 6 are erected in a manner that extends discontinuously in the direction of the axis P2 of the conical drum 2.

[0102] The materials to be separated, fed into the conical drum 2 from the input section 3, are immersed in the separation water supplied from the discharge pipe 4. As the conical drum 2 rotates, they are agitated, resulting in gravity separation. The lighter materials, along with the separation water, are discharged through the large-diameter opening 2B. At this time, because stirring blades 6 are erected on the inner wall of the conical drum 2, even when a large quantity of materials is supplied to the conical drum 2 and moves densely towards the small-diameter opening 2A, the heavier and lighter materials are efficiently agitated by the stirring blades 6 as the conical drum 2 rotates. This increases the contact opportunity with the separation water, achieving efficient gravity separation and promoting the movement of lighter materials towards the large-diameter opening 2B. The stirring blades 6 function as a second separation promoting mechanism.

[0103] The stirring blades 6 are preferably arranged in a plurality of pieces along the circumference of the conical drum 2, preferably extending from the small diameter opening 2A to the large diameter opening 2B along the axis P2 of the conical drum 2, and preferably arranged intermittently along the axis P2. In addition, the stirring blades 6 are preferably arranged in a radial orientation along the conical drum 2 or at an inclined orientation at a predetermined angle to the radial orientation.

[0104] The stirring blade 6 is not limited to a flat rectangular shape. In order to efficiently scrape up and separate the target material as the conical drum 2 rotates, it can be formed with a curved portion like a spiral blade, or it can be partially or entirely formed into an arc shape. In addition, it is not limited to fixing the entire base area of ​​the stirring blade 6 to the inner wall surface of the conical drum 2. It can also be set such that only a part of the base of the stirring blade 6 is separated from the inner wall surface of the conical drum 2. If the degree of separation is too large, it will impair the stirring effect. Therefore, it is preferable to have a particle size of less than or equal to the average particle size of the target material.

[0105] [Third Separation Promotion Agency]

[0106] like Figure 4 As shown, an annular weir 7 with a narrowed opening is provided at the end edge of the cylindrical portion 20, which has a large-diameter opening 2B formed on the conical roller 2. The weir 7 stands upright towards the inclined axis P2 in an orientation orthogonal to the cylindrical portion 20. The weir 7 is preferably annular, that is, formed around the entire circumference of the end edge of the cylindrical portion 20, but in order to facilitate the drainage of water in the separation process, a portion may be missing.

[0107] By controlling the flow of separating water, weir 7 prevents high-density materials mixed with low-density materials from being directly discharged into discharge hopper 9. Furthermore, by retaining the material to be separated inside weir 7, the opportunity for gravity separation is ensured. The height of weir 7 can be appropriately set based on the input amount of the material to be separated and the supply of separating water. In other words, weir 7 functions as a third separation facilitator.

[0108] The radial height of the weir 7 is set to be greater than the radial height of the stirring blade 6. Therefore, even if the object to be separated exhibits behavior of passing over the stirring blade 6 along with the separating water when it is being stirred by the stirring blade 6, it is possible to prevent high-density substances contained in the object to be separated from being discharged to the low-density substance side by passing over the weir 7.

[0109] [Fourth Separation Promotion Agency]

[0110] like Figure 5 As shown, a fluid jetting mechanism 8 is provided to jet fluid from the inside of the conical rollers 2 (21, 22) to or near the small-diameter opening 2A. If a large amount of material to be separated is injected from the input section 3 and flows into the small-diameter opening 2A in a short time, it may cause blockage of the small-diameter opening 2A. In such cases, by jetting fluid from the fluid jetting mechanism 8 to or near the small-diameter opening 2A, the material to be separated is dispersed by fluid pressure, thereby eliminating the blockage of the small-diameter opening 2A.

[0111] The fluid injection mechanism 8 can be composed of a fluid supply pipe 8A arranged along the pipe body constituting the inlet section 3 and a nozzle 8B provided at the top end of the fluid supply pipe 8A. The fluid injected from the fluid injection mechanism 8 can be a liquid such as water or a gas such as air. That is, the fluid injection mechanism 8 functions as a fourth separation promoting mechanism.

[0112] Alternatively, stirring blades that perform the same function as described above can be installed on the inner wall of the rotary joint 41 on the upstream side of the discharge pipe 4. Even if low-density materials are mixed in with high-density materials flowing into the discharge pipe 4, the stirring function can promote the separation of specific gravity, so that the low-density materials are pushed towards the conical drum 2 along the flow of the separating water.

[0113] exist Figure 6A , Figure 6B , Figure 6C , Figure 6D , Figure 6E The precision separation section 42 is shown in the figure.

[0114] A precision separation section 42 is provided on at least a portion of the discharge pipe 4. The precision separation section 42 has a transversely elongated section 42A with an inner cross-sectional shape, and a high-density material recovery pipe 43 that recovers high-density materials from the transversely elongated section 42A is connected in a downward-branching manner.

[0115] The precision separation section 42 has circular cross-section connecting parts 42B and 42C at its left and right ends, and each connecting part 42B and 42C is configured to connect to a circular tube. A rectangular cross-section passage 42D is formed between the left and right connecting parts 42B and 42C, and a rectangular cross-section spacer SP is inserted into the upper part of the passage 42D and fastened with bolts B.

[0116] The horizontal section 42A is formed by a passage 42D in which a spacer SP is inserted and fixed. A connection part 42E with a circular cross-section for a high-density material recovery pipe 43 is provided on the bottom left side of the connection part 42B of the passage 42D.

[0117] exist Figure 7A , Figure 7B , Figure 7C , Figure 7D , Figure 7E , Figure 7F The diagram shows two types of spacers SP housed in the precision separation section 42. The spacers SP are made of transparent acrylic resin and are rectangular blocks with threaded holes h formed at two locations on their upper surface. Each block has a different thickness, and by varying the cross-sectional area of ​​the flow path in the transverse section 42A according to which spacer SP is installed on the passage 42D, the flow rate of the separating water can be adjusted. Figure 7E , Figure 7FThe cross-sectional shape of the passage 42D with the spacer SP2 shown is compared to Figure 7A , Figure 7B , Figure 7C In the case shown where the spacer SP1 is inserted and fixed, the flow path cross-sectional area is smaller and the shape is more horizontally elongated.

[0118] exist Figure 8A , Figure 8B The separation mechanism of the object to be separated by the above-mentioned specific gravity separation device 1 is shown in the figure.

[0119] When separation water is supplied from the first water supply unit 51 and the second water supply unit 52, when the object to be separated (high specific gravity object represented by black circle and low specific gravity object represented by white circle) is fed into the rotating conical drum 2 from the input unit 3, specific gravity separation occurs inside the conical drum 2 while the separation water and the object to be separated are stirred. The high specific gravity object is mainly conveyed to the small diameter opening 2A by overcoming the flow of the separation water, while the low specific gravity object is mainly conveyed to the large diameter opening 2B by the flow of the separation water and overflows from the large diameter opening 2B. Thus, the low specific gravity object is recovered to the discharge hopper 9.

[0120] Even when a large quantity of the material to be separated is fed into the input section 3, the material being transported in a dense manner to the large-diameter opening 2B side along the flow of the separating water is blocked by the circular plates 24 and 25, which function as baffles. It is then transported little by little to the large-diameter opening 2B side through the tiny gap between the circular plates 24 and 25 and the conical drum 2, thereby promoting gravity separation. Even when the material is transported to the large-diameter opening 2B side over the circular plates 24 and 25, the stirring effect generated by the stirring blades 6 erected on the inner wall of the conical drum 2 increases the contact opportunity between the material and the separating water. Furthermore, as the material is lifted by the stirring blades and falls into the water, a difference in falling velocity is created between high-density and low-density materials, thus ensuring sufficient gravity separation.

[0121] Furthermore, even if a high-density material is mixed with a low-density material and transported to the large-diameter opening 2B, the weir 7 provided at the end can be used to temporarily prevent it from being discharged into the discharge hopper 9. During this period, gravity separation is promoted, and the high-density material is prevented from being discharged into the discharge hopper 9.

[0122] In cases where a large number of objects to be separated may be densely blocked in the small-diameter opening 2A, the dense objects to be separated are dispersed by the pressure of the fluid by the fluid injection mechanism 8, thereby avoiding blockage.

[0123] In this way, the separation objects dispersed by multiple separation and promotion mechanisms undergo specific gravity separation in the separation water. The high specific gravity objects mainly flow out through the small diameter opening 2A to the discharge pipe 4, while the low specific gravity objects mainly discharge through the large diameter opening 2B to the discharge hopper 9.

[0124] like Figure 8B As shown, even if high-density materials and a portion of low-density materials overcome the flow of the separating water and flow into the discharge pipe 4 in a dense manner, a thin layer will form in the transverse section 42A of the precision separation section 42 and flow down. At this time, the separating water supplied from the first water supply section 51 flows from the transverse section 42A to the conical roller 2, thereby efficiently pushing the low-density materials, which have increased contact with the separating water due to the formation of a thin layer, back towards the conical roller side, while the high-density materials overcome the flow of the separating water and flow towards the transverse section 42A, and are recovered into the high-density material recovery pipe 43.

[0125] The inner bottom surface of the transverse section 42A is preferably formed flat, so that the layer thickness of the separation object flowing into the transverse section 42A is thinned evenly, and the specific gravity separation performed by the separation water is made more precise.

[0126] Even if the separation water supplied from the first water supply unit 51 flows over the upper surface of the object to be separated, which forms a thin layer in the transverse section 42A and flows down, it does not sufficiently contribute to gravity separation (see reference). Figure 8B (The dotted arrow indicates that the separation water supplied from the second water supply unit 52 and rising in the high-density material recovery pipe 43 flows from the bottom side of the transverse section 42A toward the separation target, thereby pushing the low-density material back toward the conical drum 2 and contacting the lower layer of the separation target that forms a thin laminar flow, thus efficiently performing the specific gravity separation function while stirring (see reference). Figure 8B (dashed arrow).

[0127] The thickness of the spacer SP can be varied depending on the amount of the object to be separated fed into the conical roller 2 from the input section 3, or the amount of high-density substances contained in the object to be separated. This allows for precise adjustment of the separation performance of the precision separation section 42. For example, when the object to be separated contains a high amount of high-density substances, using a thinner spacer SP can improve the specific gravity separation accuracy. Alternatively, the cross-sectional shape of the transverse section 42A can be fixed to a certain shape without the spacer SP.

[0128] Hereinafter, another embodiment of the present invention will be described.

[0129] In the above embodiment, the method of supplying separation water from the first water supply section 51 located below the bifurcation of the high specific gravity recovery pipe 43 in the discharge pipe 4 and the second water supply section 52 located in the high specific gravity recovery pipe 43 has been described. However, the flow rate ratio of the separation water supplied from the first water supply section 51 and the second water supply section 52 is not particularly limited and can be appropriately set according to the nature of the object to be separated and the amount of input.

[0130] Although the method of supplying separation water from both the first water supply unit 51 and the second water supply unit 52 has been described, separation water can also be supplied from either one. That is, any separation water supply unit that supplies separation water to the lower end of the discharge pipe 4 and / or the high specific gravity recovery pipe 43 is acceptable.

[0131] In the above embodiment, the inner cross-sectional shape of the transverse portion 42A is described as rectangular, but as... Figure 9A , Figure 9B , Figure 9C , Figure 9D As shown, the inner cross-sectional shape of the horizontal section 42A can be any of the following: trapezoidal, elliptical, semi-circular, or semi-cylindrical. As long as the object to be separated and transported to the horizontal section 42A can form a thinner layer than its upstream side after flowing through the horizontal section 42A, the shape can be changed by replacing the spacer SP.

[0132] Figure 3A , Figure 3B Each of the stirring blades 6 shown is positioned parallel to the axis P2 of the conical drum 2 and orthogonal from the inner wall toward the axis P2. However, it may also be positioned inclined relative to the axis P2 of the conical drum 2, or inclined relative to the direction from the inner wall toward the axis P2. Furthermore, the shape of each stirring blade 6 is not limited to a flat rectangular shape. In addition, the stirring blades 6 may extend continuously in the axis P2 direction of the conical drum 2.

[0133] exist Figure 10A , Figure 10B , Figure 10C Other configurations of the stirring blade 6 are shown in the figure. Figure 10A yes Figure 3A , Figure 3B The example shown is an arrangement of four stirring blades 6, with the odd-numbered blades 6 and the even-numbered blades 6 arranged from the small diameter opening 2A of the conical drum 2 toward the large diameter opening 2B, with the angles of the odd-numbered blades 6 offset by 45 degrees around the axis P2. Figure 10B It is Figure 3A , Figure 3BThe example shown is an example in which four stirring blades 6 arranged from the small diameter opening 2A of the conical drum 2 toward the large diameter opening 2B are staggered by 22.5 degrees around the axis P2. Figure 10C It is Figure 3A , Figure 3B The example shown is of four stirring blades 6 arranged from the minor diameter opening 2A of the conical drum 2 toward the major diameter opening 2B, along the tangential direction of the minor diameter opening 2A of the first drum 21. These are merely examples, and appropriate structures can be designed as long as they can promote the stirring effect; the shape of the stirring blades 6 is not limited to rectangles.

[0134] like Figure 11A As shown, the annular weir 7 can also be arranged with its top tip tilted outward relative to the cylindrical portion 20, such as... Figure 11B As shown, the annular weir 7 can also be set in a position where the top end is inclined inward relative to the cylindrical part 20.

[0135] In the above embodiment, an example was described in which the conical roller 2 connects the first roller 21 and the second roller 22 with flanges, and a cylindrical portion 20 is formed at the top of the first roller 21. However, it is also possible for the first roller 21 and the second roller 22 to be integrally formed, or for the first roller 21 to not have a cylindrical portion 20 at the top.

[0136] exist Figure 12 The diagram shows a conical roller 2 without a cylindrical portion 20 at the top of the first roller 21, and shows that the conical roller 2 is provided with circular plates 24 and 25 as a first separation promoting mechanism, stirring blades 6 as a second separation promoting mechanism, and an annular weir 7 with a narrowed opening as a third separation promoting mechanism.

[0137] In the above embodiments, the complete structure of the four types of separation promoting mechanisms from the first to the fourth has been described. However, the separation promoting mechanism assembled in the specific gravity separation device 1 can be any one of the first to the fourth separation promoting mechanisms, or it can be any number of separation promoting mechanisms appropriately assembled.

[0138] A narrowed annular weir 7 is formed on the upper side of the conical drum 2. The stirring blades 6 are preferably erected on the inner wall of the upper side of the conical drum, that is, erected near the weir 7. The separation object received by the weir 7 is quickly stirred by the stirring blades 6, thereby efficiently performing gravity separation.

[0139] exist Figures 14A to 17The diagram illustrates a gravity separation device 1 that, in addition to having circular plates 24 and 25 functioning as a first separation promoting mechanism, or stirring blades 6 functioning as a second separation promoting mechanism, also includes a weir 7 functioning as a third separation promoting mechanism. The gravity separation device 1 of the present invention may have any one of the aforementioned first to fourth separation promoting mechanisms, or may combine any combination of the first to fourth separation promoting mechanisms.

[0140] Example

[0141] exist Figure 13A The diagram shows the relationship between the amount of raw material (slag) fed into the gravity separation device 1 and the recovery rate of high-density substances (metals). This is an experimental result based on the case where the gravity separation device 1 only has the circular plates 24 and 25, which serve as the first separation promoting mechanism, as described above. It can be seen that as the amount of raw material fed in increases, the metal recovery rate tends to decrease.

[0142] exist Figure 13B The figure also shows the relationship between the input amount of raw material (slag) and the recovery rate of high-density substances (metals) in the gravity separation device 1 with stirring blades 6 (the part circled in the figure). It can also be confirmed that by having stirring blades 6, even if the input amount of raw material is increased, the metal recovery rate will increase.

[0143] The above-described embodiments are merely one example of the present invention, and the specific structure of each part can be appropriately modified within the scope of achieving the effects of the present invention.

[0144] Explanation of reference numerals in the attached figures

[0145] 1: Gravity separation device

[0146] 2: Conical roller

[0147] 20: Cylindrical section

[0148] 21: First Roller

[0149] 22: Second roller

[0150] 23: Spiral groove

[0151] 24: Circular plate (baffle)

[0152] 25: Circular plate (baffle)

[0153] 26: Installation Department

[0154] 2A: Small path opening

[0155] 2B: Large-diameter opening

[0156] 3: Investment Department

[0157] 4: Discharge pipe

[0158] 40: Bearing

[0159] 41: Rotary joint

[0160] 42: Precision Separation Section

[0161] 42A: Horizontal section

[0162] 42D: Passage

[0163] SP: Spacer

[0164] 43: High-density material recovery pipe

[0165] 44: High-density material storage section

[0166] V1: First valve mechanism

[0167] V2: Second valve mechanism

[0168] V3: Third valve mechanism

[0169] V4: Fourth Valve Mechanism

[0170] 51: First Water Supply Department

[0171] 52: Second Water Supply Department

[0172] 7: Weir

[0173] 8: Fluid injection mechanism

[0174] 9: Discharge hopper

[0175] F: Framework

[0176] MP: stand

[0177] M: Motor

[0178] R: Idle roller

[0179] P1: Horizontal axis

[0180] P2: Inclined axis.

Claims

1. A specific gravity separation device, wherein, have: A conical roller, supported by an axis that can rotate about an inclined position, has a small-diameter opening at the lower end and a large-diameter opening at the upper end. The feeding section feeds granular materials into the conical drum for separation. as well as The discharge pipe is configured at an angle, with its upper end connected to the small-diameter opening; While the conical drum is rotating, separation water is supplied to the conical drum from the discharge pipe to recover high-density substances contained in the object to be separated that flow towards the discharge pipe from the small-diameter opening against the flow of the separation water. Meanwhile, low-density substances contained in the object to be separated are discharged and recovered together with the separation water from the large-diameter opening of the conical drum. The stirring blades that agitate the separated material as the conical drum rotates are erected on the inner wall of the conical drum.

2. The specific gravity separation device according to claim 1, wherein, The stirring blades are arranged in a plurality of pieces along the circumference of the conical drum.

3. The specific gravity separation device according to claim 1, wherein, The stirring blades are erected extending along the axial direction of the conical drum from the small diameter opening to the large diameter opening.

4. The specific gravity separation device according to claim 3, wherein, The stirring blades are intermittently erected in the axial direction.

5. The specific gravity separation device according to claim 3, wherein, The stirring blades are positioned in a radial orientation along the conical drum, or in an inclined orientation at a predetermined angle to the radial orientation.

6. The specific gravity separation device according to claim 1, wherein, The specific gravity separation device includes: a separation action water supply section, a high specific gravity recovery pipe that branches downward from the discharge pipe to recover the high specific gravity material, and supplies the separation action water to the lower end of the discharge pipe and / or the high specific gravity material recovery pipe.

7. The specific gravity separation device according to claim 1, wherein, At least a portion of the discharge pipe is provided with a horizontally elongated section whose inner cross-sectional shape is horizontally elongated. A high-density material recovery pipe for recycling the high-density material is branched downward from the horizontally elongated section. The separation water is supplied from a first water supply section located at a position lower than the branched section of the high-density material recovery pipe.

8. The specific gravity separation device according to claim 7, wherein, The inner cross-sectional shape of the transverse portion is any one of the following: rectangular, trapezoidal, elliptical, semicircular, or semi-cylindrical.

9. The specific gravity separation device according to claim 7, wherein, The inner bottom surface of the transverse portion is formed flat.

10. The specific gravity separation device according to claim 7, wherein, The transverse section and the high-density material recovery tube are formed by light-transmitting components.

11. The specific gravity separation device according to claim 1, wherein, A narrowed annular weir is formed on the upper end side of the conical roller.

12. The specific gravity separation device according to claim 1, wherein, The specific gravity separation device is equipped with a fluid injection mechanism, which injects fluid from the inside of the conical drum toward the small diameter opening or the vicinity of the small diameter opening.

13. The specific gravity separation device according to claim 12, wherein, The fluid is either a gas or a liquid.

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