Specific gravity separation device

Abstract

To provide a specific gravity separation device efficiently separating and recovering a high specific gravity material from a separation target object, and recovering the high specific gravity material at a high recovery rate while suppressing an amount of a low specific gravity material admixed in the recovered high specific gravity material.SOLUTION: A specific gravity separation device performs specific gravity separation using a conical drum from the upper end side of which separation target objects are charged, and separation action water supplied from a discharge pipe connected to the lower end side of the drum, discharges low specific gravity material from the upper end of the conical drum, and recovers high specific gravity material through the discharge pipe. Agitation blades agitating the separation target object accompanying rotation of the conical drum are raised on the inner wall of the conical drum.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a gravity separation device that separates granular objects to be separated by utilizing differences in specific gravity, and relates to a technique for separating and recovering valuable metals from, for example, molten waste slag. [Background technology]

[0002] Waste molten slag, which is made by melting and processing municipal waste incineration ash, shredder dust, landfilled industrial waste, etc. in a melting furnace, contains valuable metals such as gold, silver, copper, platinum, and palladium, and if the valuable metals can be separated and recovered from the waste molten slag, it can be recycled. On the other hand, when crushing waste molten slag is used as a resource for civil engineering and construction aggregate or ceramic raw material, more effective recycling of the waste molten slag can be achieved if the valuable metals and other metals that become impurities can be separated and recovered at an earlier stage.

[0003] Patent Document 1 discloses a specific gravity separation device which includes a rotating drum which rotates around an axis of rotation which is inclined at a predetermined angle to the horizontal and is a cylinder having a conical portion, a discharge portion which is connected to a small diameter opening formed at the apex of the conical portion located at the lower end side of the rotating drum, and a separation object input portion which is inserted into the rotating drum from a large diameter opening at the upper end side of the rotating drum and whose tip opening faces the apex of the conical portion, and a water supply means is connected to the opposite end of the discharge portion which is connected to the small diameter opening, and the water supply means supplies separating water and is connected to a separated matter discharge means which discharges the separated matter midway. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-211019 A Summary of the Invention [Problem to be solved by the invention]

[0005] For example, in the case where the granular material to be separated is crushed waste molten slag, which is a mixture of metals with a relatively high specific gravity and slag with a relatively low specific gravity, the above-mentioned gravity separation device can be suitably used.

[0006] Figure 13(a) shows the relationship between the amount of material fed into the gravity separator and the recovery rate of metals. When the amount of material fed into the gravity separator is increased, the separation efficiency decreases and the metals tend to be discharged from the large opening together with the slag by the separating water, resulting in a decrease in the metal recovery rate. Conversely, when the amount of material fed into the gravity separator is decreased, the metal recovery rate increases, but the time required for separation increases.

[0007] In addition, reducing the flow of the separating water increases the recovery rate of metals, but at the same time increases the amount of slag mixed into the recovered metals, raising the impurity concentration. As the impurity concentration increases, the profit from selling the recovered valuable metals decreases. Increasing the flow of the separating water decreases the impurity concentration, but decreases the metal recovery rate.

[0008] The above-mentioned tendency remains the same even if the object of separation is a granular material other than a mixture of slag and metals, for example, in the case of separating and recovering trace amounts of minerals from granular material made by crushing waste rocks after ore dressing of minerals extracted from a mine.

[0009] The object of the present invention is to provide a gravity separation device that can efficiently separate and recover high specific gravity materials from the objects to be separated, and can recover the high specific gravity materials at a high recovery rate by suppressing the amount of low specific gravity materials that become mixed into the recovered high specific gravity materials. [Means for solving the problem]

[0010] In order to achieve the above-mentioned object, the first characteristic configuration of the specific gravity separation device according to the present invention is a specific gravity separation device comprising: a conical drum supported rotatably around an axis in an inclined position, with a small diameter opening formed at the lower end and a large diameter opening formed at the upper end; an input section for inputting granular materials to be separated into the conical drum; and a discharge pipe arranged in an inclined position and having an upper end connected to the small diameter opening. The specific gravity separation device supplies separation water from the discharge pipe toward the conical drum while the conical drum is rotating, recovers high specific gravity materials contained in the materials to be separated that flow down from the small diameter opening to the discharge pipe against the flow of the separation water, and discharges and recovers low specific gravity materials contained in the materials to be separated together with the separation water from the large diameter opening of the conical drum. The specific gravity separation device is characterized in that an agitator blade that agitates the materials to be separated as the conical drum rotates is provided on the inner wall of the conical drum.

[0011] The materials to be separated are introduced into the conical drum from the introduction section, immersed in the separating water supplied from the discharge pipe, and are separated by gravity as they are stirred with the rotation of the conical drum, and the low specific gravity materials are discharged from the large diameter opening together with the separating water. The high specific gravity materials among the materials to be separated that flow into the discharge pipe flow down against the flow of the separating water and are collected. By providing the stirring blades upright on the inner wall of the conical drum, even when a large amount of materials to be separated are supplied to the conical drum and move toward the small diameter opening in a dense state, the high and low specific gravity materials are effectively stirred by the stirring blades as the conical drum rotates, increasing the chance of contact with the separating water. In addition, the materials to be treated are lifted by the stirring blades, and due to the difference in the falling speed of the high and low specific gravity materials as they fall through the water, they are effectively separated by specific gravity, and the movement of the low specific gravity materials to the large diameter opening is promoted.

[0012] The second characteristic feature of the present invention is that, in addition to the first characteristic feature described above, the stirring blades are provided in a plurality in the circumferential direction of the conical drum.

[0013] As the conical drum rotates, the densely packed materials to be separated are repeatedly scraped up in the circumferential direction by the stirring blades, causing gravity separation, promoting the movement of low specific gravity materials toward the larger diameter opening and promoting the movement of high specific gravity materials toward the smaller diameter opening.

[0014] The third characteristic configuration is that, in addition to the first characteristic configuration described above, the stirring blade is erected so as to extend in the axial direction of the conical drum from the small diameter opening to the large diameter opening.

[0015] The stirring blades extending in the axial direction of the conical drum from the small diameter opening to the large diameter opening continuously stir the material to be separated moving along the axis of the conical drum, thereby ensuring sufficient opportunity for gravity separation.

[0016] The fourth characteristic feature of the present invention is that, in addition to the third characteristic feature described above, the stirring blades are erected so as to be discontinuous in the axial direction.

[0017] Since the stirring blades are arranged discontinuously in the axial direction, the stirring state changes at the discontinuous points, thereby improving the stirring effect.

[0018] The fifth characteristic configuration is that, in addition to the third characteristic configuration described above, the stirring blades are arranged upright in a position along the radial direction of the conical drum or in an inclined position forming a predetermined angle with the radial direction.

[0019] The agitator blades extending in the axial direction of the conical drum are arranged upright in a position along the radial direction of the conical drum or in an inclined position forming a predetermined angle with the radial direction, so that the material to be separated received on the surface of the agitator blades is efficiently agitated as the conical drum rotates.

[0020] The sixth characteristic configuration is that, in addition to the first characteristic configuration described above, a high specific gravity matter recovery pipe for recovering the high specific gravity matter from the discharge pipe is branched downward, and a separation action water supply section is provided for supplying the separation action water to the lower end of the discharge pipe and / or the high specific gravity matter recovery pipe.

[0021] Of the materials to be separated that flow into the discharge pipe, the high specific gravity materials flow down against the flow of the separating water and are collected in the high specific gravity material recovery pipe. By supplying the separating water from the lower end of the discharge pipe toward the conical drum, the materials are effectively separated by specific gravity inside the discharge pipe, and by supplying the separating water from the high specific gravity material recovery pipe, the low specific gravity materials are effectively prevented from flowing down into the high specific gravity material recovery pipe. Effect of the Invention

[0022] As described above, according to the present invention, it is possible to provide a gravity separation device that can efficiently separate and recover high specific gravity materials from the material to be separated, and can recover the high specific gravity materials at a high recovery rate by reducing the amount of low specific gravity materials that become mixed into the recovered high specific gravity materials. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is an explanatory diagram of a specific gravity separator to which the present invention is applied; (a) is a plan view, (b) is a front view, and (c) is a right side view. [Diagram 2] (a) is a bottom view of the main part of the conical drum, (b) is a longitudinal sectional view of the same, (c) is a plan view of a baffle plate attached inside the conical drum, and (d) is a longitudinal sectional view of the main part of the conical drum with two baffle plates of different diameters attached. [Diagram 3] (a) is a longitudinal cross-sectional view of a conical drum equipped with stirring blades, and (b) is a plan view of the same. [Figure 4] Longitudinal section of a conical drum with a weir [Diagram 5] A longitudinal cross-sectional view of a conical drum equipped with a fluid ejection mechanism. [Figure 6] 1 is an explanatory diagram of the precision separation part, (a) is a left side view, (b) is a vertical cross-sectional view, (c) is a right side view, (d) is a cross-sectional view taken along line AA in (b), and (e) is a bottom view. [Figure 7] FIG. 1 is an explanatory diagram of two types of spacers incorporated in the precision separation unit; (a) and (d) are plan views of the two types, (b) and (e) are side views of the two types, and (c) and (f) are front views of the two types. [Figure 8](a) is an explanatory diagram of the separation mechanism of the gravity separator, and (b) is an explanatory diagram of the separation mechanism of the precision separator. [Figure 9] 1A to 1D are explanatory views of the cross-sectional shape of a horizontally elongated portion showing another embodiment. [Figure 10] 1A, 1B, and 1C are explanatory views of an agitating blade showing another embodiment. [Figure 11] 1A and 1B are explanatory views of a dam showing another embodiment. [Figure 12] FIG. 13 is an explanatory diagram of a main part of a conical drum according to another embodiment. [Figure 13] FIG. 1(a) is an explanatory diagram of the correlation between the amount of slag input and the metal recovery rate in a conventional gravity separator, and FIG. 1(b) is an explanatory diagram of the correlation between the amount of slag input and the metal recovery rate in a gravity separator of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, an embodiment of the gravity separation device according to the present invention will be described. 1(a), (b), and (c) show the overall configuration of the gravity separator 1, and Fig. 8(a) shows the main part of the gravity separator 1. In this embodiment, the object to be separated by the gravity separator 1 is crushed waste molten slag containing valuable metals, but the object to be separated is not particularly limited as long as it is a granular material with different specific gravities.

[0025] The gravity separator 1 comprises a conical drum 2 with a small diameter opening 2A formed at the bottom and a large diameter opening 2B formed at the top, an input section 3 formed of a pipe into which granular materials to be separated (high specific gravity materials are shown as black circles and low specific gravity materials are shown as white circles in Fig. 8(a)) are input together with water from the large diameter opening 2B, and a discharge pipe 4 whose upper end communicates with the small diameter opening 2A via a bearing 40 and a rotary joint 41 and to which separating water is supplied from the lower end. The device also comprises a discharge hopper 9 for receiving the low specific gravity materials discharged together with the separating water from the large diameter opening 2B.

[0026] The gravity separation device 1 is attached to a frame F that is supported on a substantially rectangular parallelepiped stand MP so as to be rotatable around a horizontal axis P1, and the frame F is fixed to be inclined at a predetermined angle θ with respect to the stand MP, so that the conical drum 2 and the discharge pipe 4 are arranged to be located on the inclined axis P2 of the predetermined angle θ. The appropriate range of the predetermined angle θ is appropriately set depending on the properties of the material to be separated and the flow rate of the separation water, and in this embodiment, it is set to an inclination angle of 35±5 degrees with respect to the horizontal line. In this embodiment, the conical drum 2 and the discharge pipe 4 are arranged on the inclined axis P2 via a rotary joint 41, but the axis of the conical drum 2 and the axis of the discharge pipe 4 may be arranged to be inclined at different angles.

[0027] The conical drum 2 is supported by a frame F so as to be rotatable around an inclined axis P2, and an electromagnetic motor M that rotates the conical drum 2 and a pair of idle rollers R that rotatably support the conical drum 2 are arranged on the frame F. A sprocket attached to the output shaft of the electromagnetic motor M and a sprocket attached to the inner ring side of a bearing 40 provided on the small diameter opening 2A side of the conical drum 2 are drivingly connected via a chain.

[0028] The conical drum 2 is constructed by flange-connecting a first drum 21 having a large diameter opening 2B and a second drum 22 having a small diameter opening 2A, and a cylindrical portion 20 is formed at the tip of the first drum 21.

[0029] The discharge pipe 4 is provided downstream of the rotary joint 41 with a precision separation section 42 having a horizontally elongated section 42A whose inner cross-sectional shape is formed horizontally, and a high specific gravity material recovery pipe 43 branches downward from the precision separation section 42. A first water supply section 51 is connected to the lower end side of the precision separation section 42 via a first valve mechanism V1, and separation water is supplied from the first water supply section 51 to the discharge pipe 4.

[0030] A high specific gravity material storage section 44 having a third valve mechanism V3 and a fourth valve mechanism V4 at both ends is connected to the high specific gravity material recovery pipe 43. A second water supply section 52 is further connected to the upper part of the high specific gravity material storage section 44 via a second valve mechanism V2, and separation water is supplied from the second water supply section 52 to the discharge pipe 4. The precision separation section 42, the high specific gravity material recovery pipe 43 and the high specific gravity material storage section 44 are made of transparent pipes made of acrylic resin so that the inside can be visually observed.

[0031] FIG. 2(a) shows the first drum 21 and the cylindrical portion 20 as viewed from the opposite side of the large diameter opening 2B, and FIG. 2(b) shows a cross section of the first drum 21 and the cylindrical portion 20.

[0032] In order to efficiently separate the objects to be separated based on specific gravity in the conical drum 2, a number of separation promotion mechanisms are provided. The following will explain them in detail. [First separation promotion mechanism] As shown in Fig. 2(d), inside the first drum 21, two doughnut-shaped disks 24, 25 of different diameters as shown in Fig. 2(c) are arranged in parallel at a predetermined interval along the axis P2. The disks 24, 25 are fixed to the inner peripheral surface of the first drum 21 via attachment parts 26 formed at three points on the outer peripheral edge of each disk 24, 25 so that gaps serving as passages for the objects to be separated are formed between the outer peripheral edges of each disk 24, 25 and the inner peripheral surface of the first drum 21.

[0033] When the materials to be separated that are input from the input section 3 are flowed in a dense state toward the large diameter opening 2B by the separating water, they are received and agitated by the disks 24, 25, and after gravity separation, mainly the light materials are flowed toward the large diameter opening 2B through the gaps formed between the outer edges of the disks 24, 25 and the inner wall of the first drum 21. The disks 24, 25 function as baffles, forming a first separation promotion mechanism.

[0034] [Second mechanism for promoting separation] 3(a), (b) and 8(a), stirring blades 6 that stir the material to be separated as the conical drum 2 rotates are provided on the inner walls of the first drum 21 and the second drum 22. In this example, the stirring blades 6 are provided at equal intervals around the axis P2 of the conical drum 2 at intervals of 90 degrees when viewed from the direction of the axis P2 of the conical drum 2, and are provided so that four flat rectangular stirring blades 6 extend intermittently in the direction of the axis P2 of the conical drum 2.

[0035] The materials to be separated that are fed into the conical drum 2 from the feed section 3 are immersed in the separation water fed from the discharge pipe 4, and are separated by gravity by being stirred as the conical drum 2 rotates, and the low-specific-gravity materials are discharged from the large-diameter opening 2B together with the separation water. At this time, by providing the stirring blade 6 on the inner wall of the conical drum 2, even if a large amount of materials to be separated are fed into the conical drum 2 and move toward the small-diameter opening 2A in a dense state, the high-specific-gravity materials and the low-specific-gravity materials are effectively stirred by the stirring blade 6 as the conical drum 2 rotates, increasing the chance of contact with the separation water and effectively separating the materials by specific gravity, and promoting the movement of the low-specific-gravity materials toward the large-diameter opening 2B. The stirring blade 6 functions as a second separation promotion mechanism.

[0036] A plurality of stirring blades 6 are preferably provided upright in the circumferential direction of the conical drum 2, and are preferably provided upright so as to extend in the direction of the axis P2 of the conical drum 2 from the small diameter opening 2A to the large diameter opening 2B, and are preferably provided upright so as to be discontinuous in the direction of the axis P2. In addition, the stirring blades 6 are preferably provided upright in a position along the radial direction of the conical drum 2 or in an inclined position forming a predetermined angle with the radial direction.

[0037] The stirring blade 6 is not limited to a flat rectangular shape, and may have a curved portion like a screw blade, or may be formed in a partially or entirely arc shape so that the material to be separated can be efficiently stirred up with the rotation of the conical drum 2. In addition, the stirring blade 6 is not limited to a mode in which the entire base of the stirring blade 6 is fixed to the inner wall surface of the conical drum 2, and may be installed so that a part of the base of the stirring blade 6 is separated from the inner wall surface of the conical drum 2. The degree of separation is preferably equal to or less than the average particle size of the material to be separated, since the stirring action is impaired if the degree of separation is not too large.

[0038] [Third separation promotion mechanism] 4, an annular weir 7 that narrows the opening is installed at the edge of the cylindrical portion 20 where the large-diameter opening 2B of the conical drum 2 is formed, so as to rise toward the inclined axis P2 in an orientation perpendicular to the cylindrical portion 20. The weir 7 is preferably formed in an annular shape, that is, around the entire edge of the cylindrical portion 20, but may have some missing portions to facilitate drainage of separation water.

[0039] The weir 7 receives the high specific gravity materials mixed with the low specific gravity materials from the flow of the separating water and discharges them directly into the discharge hopper 9, and the materials to be separated are retained inside the weir 7 to ensure an opportunity for gravity separation. The height of the weir 7 may be set appropriately depending on the amount of materials to be separated input, the amount of separating water supplied, etc. In other words, the weir 7 functions as a third separation promotion mechanism.

[0040] The height of the weir 7 in the axial direction is set to be greater than the height of the agitator blade 6 in the axial direction. This makes it possible to prevent high specific gravity materials contained in the materials from climbing over the weir 7 and being discharged to the low specific gravity materials side, even if the materials to be separated climb over the agitator blade 6 together with the separating water when the materials are agitated by the agitator blade 6.

[0041] [The fourth mechanism for promoting separation] As shown in Fig. 5, a fluid injection mechanism 8 is provided that injects a fluid from inside the conical drum 2 (21, 22) toward the small diameter opening 2A or the vicinity of the small diameter opening 2A. If a large amount of the objects to be separated input from the input section 3 flows into the small diameter opening 2A in a short period of time, there is a risk that the small diameter opening 2A will be clogged. In such a case, by injecting a fluid from the fluid injection mechanism 8 toward the small diameter opening 2A or the vicinity of the small diameter opening 2A, the objects to be separated are dispersed by the fluid pressure, and the clog of the small diameter opening 2A is resolved.

[0042] The fluid ejection mechanism 8 can be composed of a fluid supply pipe 8A arranged along the tubular body constituting the input section 3, and a nozzle 8B provided at the tip of the fluid supply pipe 8A. The fluid ejected from the fluid ejection mechanism 8 may be a liquid such as water, or a gas such as air. In other words, the fluid ejection mechanism 8 functions as a fourth separation promotion mechanism.

[0043] A stirring blade having the same function as described above may be installed on the inner wall of the discharge pipe 4 upstream of the rotary joint 41. Even if low specific gravity materials are mixed with high specific gravity materials that have flowed down the discharge pipe 8, the stirring function will promote gravity separation, and the low specific gravity materials will be swept away toward the conical drum 2 along with the flow of the separating water.

[0044] 6(a) to (e) show the precision separation section 42. A precision separation section 42 is provided in at least a part of the discharge pipe 4. The precision separation section 42 includes a horizontally elongated section 42A having an inner cross-sectional shape formed horizontally, and a high-specific-gravity material recovery pipe 43 for recovering high-specific-gravity material is branched downward and connected to the horizontally elongated section 42A.

[0045] The precision separation part 42 has left and right ends each equipped with a connecting part 42B, 42C having a circular cross section, and is configured so that a circular pipe can be connected to each connecting part 42B, 42C. A passage 42D having a rectangular cross section is formed between the left and right connecting parts 42B, 42C, and a spacer SP having a rectangular cross section is inserted into the upper part of the passage 42D and fastened by a bolt B.

[0046] The passage 42D into which the spacer SP is inserted and fixed constitutes the horizontally elongated portion 42A. A connection portion 42E for a high specific gravity material recovery pipe 43 having a circular cross section is provided on the left bottom surface of the connection portion 42B of the passage 42D.

[0047] 7(a) to (f) show two types of spacers SP housed in the precision separation unit 42. The spacers SP are made of transparent acrylic resin and are rectangular parallelepiped blocks with two screw holes h formed on the top surface. The thickness of each block is different, and the flow rate of the separation water can be adjusted by changing the flow path cross-sectional area of ​​the horizontally elongated part 42A depending on which spacer SP is attached to the passage 42D. The cross-sectional shape of the passage 42D into which the spacer SP2 shown in Figs. 7(e) to (f) is inserted and fixed has a smaller flow path cross-sectional area and is more horizontally elongated than the case in which the spacer SP1 shown in Figs. 7(a) to (c) is inserted and fixed.

[0048] 8(a) and (b) show the separation mechanism of the objects to be separated by the above-mentioned specific gravity separator 1. FIG. With separating water being supplied from the first water supply section 51 and the second water supply section 52, the materials to be separated (high specific gravity materials are indicated by black circles and low specific gravity materials are indicated by white circles) are fed from the feeding section 3 into the rotating conical drum 2. Inside the conical drum 2, the separating water and the materials to be separated are stirred and separated by specific gravity, with the high specific gravity materials being transported mainly against the flow of the separating water toward the small diameter opening 2A and the low specific gravity materials being transported mainly with the flow of the separating water to the large diameter opening 2B, where they overflow the large diameter opening 2B and are collected in the discharge hopper 9.

[0049] Even when a large amount of materials to be separated is input from the input section 3, the materials to be separated that are transported in a dense state along the flow of the separating water toward the large-diameter opening 2B are blocked by the disks 24, 25 that function as baffles, and are transported little by little toward the large-diameter opening 2B through the small gap between the disks 24, 25 and the conical drum 2, promoting the gravity separation action. Even when the materials to be separated climb over the disks 24, 25 and are transported toward the large-diameter opening 2B, the opportunity for contact between the materials to be separated and the separating water is increased due to the stirring effect of the stirring blades 6 erected on the inner wall of the conical drum 2, and the opportunity for gravity separation is sufficiently ensured due to the difference in the falling speed between the materials with high specific gravity and the materials with low specific gravity when the materials to be separated are lifted by the stirring blades and fall through the water.

[0050] Furthermore, even if high specific gravity materials are transported to the large diameter opening 2B mixed with low specific gravity materials, the weir 7 at the end temporarily prevents discharge into the discharge hopper 9, promoting gravity separation during that time and preventing the high specific gravity materials from being discharged into the discharge hopper 9.

[0051] In the event that a large amount of separation objects are crowded together in the small diameter opening 2A and there is a risk of clogging, by injecting fluid from the fluid injection mechanism 8, the crowded separation objects are dispersed by the pressure of the fluid, thereby preventing clogging.

[0052] In this way, the materials to be separated that have been dispersed by the multiple separation promotion mechanisms are separated by density in the separating water, with mainly the high density materials flowing out to the discharge pipe 4 via the small diameter opening 2A, and mainly the low density materials being discharged into the discharge hopper 9 via the large diameter opening 2B.

[0053] As shown in Fig. 8(b), even when high specific gravity materials and some low specific gravity materials flow into the discharge pipe 4 in a dense state against the flow of the separating water, they form a thin layer in the horizontally elongated portion 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 horizontally elongated portion 42A toward the conical drum 2, so that the low specific gravity materials, which have an increased chance of contacting the separating water due to the thin layer, are efficiently pushed back toward the conical drum, and the high specific gravity materials flow down the horizontally elongated portion 42A against the flow of the separating water and are collected in the high specific gravity material collection pipe 43.

[0054] The inner bottom surface of the elongated portion 42A is preferably formed flat, so that the layer thickness of the material to be separated flowing down the elongated portion 42A becomes uniformly thin, and the accuracy of the specific gravity separation by the separating water can be made uniform.

[0055] Even if the separating water supplied from the first water supply section 51 flows over the top surface of the objects to be separated as they flow down in the horizontal section 42A in a thin layer and does not contribute sufficiently to gravity separation (see the dashed arrow in Figure 8(b)), the separating water supplied from the second water supply section 52 and rising up the high specific gravity material recovery pipe 43 flows from the bottom surface of the horizontal section 42A toward the objects to be separated, pushing the low specific gravity materials back toward the conical drum 2 and contacting the lower layer of the objects to be separated as they flow down in a thin layer, thereby providing an effective specific gravity separation function while stirring (see the dashed arrow in Figure 8(b)).

[0056] By varying the thickness of the spacer SP depending on the amount of separation objects fed from the feeding section 3 into the conical drum 2 or the amount of high specific gravity materials contained in the separation objects, the separation performance of the precision separation section 42 can be well adjusted. For example, when the separation objects contain a large amount of high specific gravity materials, the accuracy of specific gravity sorting can be improved by using a thinner spacer SP. The cross-sectional shape of the horizontally elongated section 42A may be fixed to a constant shape without providing the spacer SP.

[0057] Another embodiment of the present invention will now be described. In the above-described embodiment, a configuration has been described in which separation water is supplied from both the first water supply section 51 provided on the discharge pipe 4 below the branching section of the high specific gravity material recovery pipe 43, and the second water supply section 52 provided on the high specific gravity material recovery pipe 43. 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 set appropriately based on the properties of the material to be separated and the amount input.

[0058] Although the embodiment in which separation water is supplied from both the first water supply section 51 and the second water supply section 52 has been described, separation water may be supplied from either one of them. That is, it is sufficient to have a separation water supply section that supplies separation water to the lower end of the discharge pipe 4 and / or the high specific gravity matter recovery pipe 43.

[0059] In the above-described embodiment, the inner cross-sectional shape of the horizontal portion 42A is formed into a rectangle, but as shown in Figures 9(a) to (d), the inner cross-sectional shape of the horizontal portion 42A may be any other shape such as a trapezoid, an ellipse, a semicircle, or a kamaboko shape, as long as the material to be separated transported to the horizontal portion 42A flows down into the horizontal portion 42A and becomes a thinner layer than the upstream side, and this can be accommodated by changing the inner cross-sectional shape of the horizontal portion 42A by replacing the spacer SP.

[0060] 3(a) and (b), each stirring blade 6 is arranged parallel to the axis P2 of the conical drum 2 and perpendicular to the axis P2 from the inner wall. However, each stirring blade 6 may be arranged inclined to the axis P2 of the conical drum 2 or inclined to the direction from the inner wall to the axis P2. The shape of each stirring blade 6 is not limited to a flat rectangular shape. The stirring blade 6 may extend continuously in the axis P2 of the conical drum 2.

[0061] Other embodiments of the agitating blades 6 are shown in Figures 10(a), (b), and (c). Figure 10(a) shows an example in which, among the agitating blades 6 shown in Figures 3(a) and (b), the angles of the odd-numbered agitating blades 6 and the even-numbered agitating blades 6 among the four agitating blades 6 arranged from the small diameter opening 2A to the large diameter opening 2B of the conical drum 2 are shifted by 45 degrees around the axis P2. Figure 10(b) shows an example in which, among the agitating blades 6 shown in Figures 3(a) and (b), the angles of the odd-numbered agitating blades 6 among the four agitating blades 6 arranged from the small diameter opening 2A to the large diameter opening 2B of the conical drum 2 are shifted by 22.5 degrees around the axis P2. 10(c) shows an example in which, of the stirring blades 6 shown in Fig. 3(a) and (b), four stirring blades 6 arranged from the small diameter opening 2A toward the large diameter opening 2B of the conical drum 2 are arranged along the tangential direction of the small diameter opening 2A of the first drum 21. These are merely examples, and any suitable configuration may be used as long as it promotes the stirring effect, and the shape of the stirring blades 6 is not limited to a rectangle.

[0062] As shown in Figure 11(a), the annular dam 7 may be installed with its tip inclined outward relative to the cylindrical portion 20, and as shown in Figure 11(b), the annular dam 7 may be installed with its tip inclined inward relative to the cylindrical portion 20.

[0063] In the above-described embodiment, an example was described in which the conical drum 2 flange-connects the first drum 21 and the second drum 22, and the cylindrical portion 20 is formed at the tip of the first drum 21. However, the first drum 21 and the second drum 22 may be formed integrally, or the tip of the first drum 21 may not be provided with a cylindrical portion 20.

[0064] FIG. 12 shows a conical drum 2 in which the tip of the first drum 21 does not have a cylindrical portion 20, and shows an embodiment in which the conical drum 2 is provided with disks 24, 25 as a first separation promotion mechanism, an agitator blade 6 as a second separation promotion mechanism, and an annular weir 7 that narrows the opening as a third separation promotion mechanism.

[0065] In the above-described embodiment, a configuration has been described that includes all four types of separation promotion mechanisms, from the first to the fourth. However, the separation promotion mechanism incorporated in the specific gravity separation device 1 may include any one of the first to fourth separation promotion mechanisms, or may include a plurality of separation promotion mechanisms that are an appropriate combination of any of the mechanisms.

[0066] It is preferable that an annular dam 7 that narrows the opening is formed on the upper end side of the conical drum 2, and an agitator blade 6 is erected on the inner wall at the upper end side of the conical drum, i.e., near the dam 7, so that the material to be separated received by the dam 7 is quickly agitated by the agitator blade 6, thereby enabling effective specific gravity separation. EXAMPLES

[0067] Fig. 13(a) shows the relationship between the amount of raw material (slag) to be separated and the recovery rate of high specific gravity materials (metals) fed into the gravity separator 1. The graph shows the experimental results when the gravity separator 1 is equipped with only the disks 24 and 25, which are the first separation promotion mechanism, of the above-mentioned separation promotion mechanisms. As the amount of raw material fed increases, the recovery rate of metals tends to decrease.

[0068] Fig. 13(b) shows the relationship (encircled area in the figure) between the amount of raw material (slag) fed and the recovery rate of high specific gravity materials (metals) using a gravity separator 1 further equipped with an agitator blade 6. It was confirmed that the provision of the agitator blade 6 increased the recovery rate of metals even when the amount of raw material fed was increased.

[0069] The above-described embodiment is merely one example of the present invention, and the specific configuration of each part can be appropriately modified and designed within the scope in which the effects of the present invention are achieved. [Explanation of symbols]

[0070] 1: Specific gravity separator 2: Conical drum 20: Cylindrical part 21: First drum 22: 2nd drum 23: Spiral groove 24: Disk (baffle plate) 25: Disk (baffle plate) 26: Mounting part 2A: Small diameter opening 2B: Large diameter opening 3: Insertion section 4: Discharge pipe 40: Bearing 41: Rotary joint 42: Precision separation section 42A: Horizontal section 42D: Passage SP: Spacer 43: High density material collection pipe 44: High density material storage section V1: First valve mechanism V2: Second valve mechanism V3: 3rd valve mechanism V4: 4th valve mechanism 51: First water supply section 52: Second water supply section 7: Weir 8:Fluid injection mechanism 9: Discharge hopper F: Frame MP: Mount M: Motor R: Idle roller P1: horizontal axis center P2: Inclined axis

Claims

1. a conical drum that is supported rotatably about an axis in an inclined position and has a small diameter opening formed at a lower end side and a large diameter opening formed at an upper end side; An input unit that inputs a granular separation target material into the conical drum; a discharge pipe disposed in an inclined position and having an upper end side communicating with the small diameter opening; a specific gravity separation device that supplies separation water from the discharge pipe toward the conical drum while the conical drum is rotating, recovers high specific gravity matter contained in the separation object that flows down from the small diameter opening to the discharge pipe against the flow of the separation water, and discharges and recovers low specific gravity matter contained in the separation object from the large diameter opening of the conical drum together with the separation water, A specific gravity separation device, in which an agitating blade that agitates the material to be separated as the conical drum rotates is provided upright on the inner wall of the conical drum.

2. 2. The gravity separator according to claim 1, wherein the stirring blades are provided in a plurality in a circumferential direction of the conical drum.

3. 2. The gravity separator according to claim 1, wherein the stirring blade is erected so as to extend in the axial direction of the conical drum from the small diameter opening to the large diameter opening.

4. 4. The gravity separator according to claim 3, wherein the stirring blades are provided vertically so as to be discontinuous in the axial direction.

5. 4. The gravity separator according to claim 3, wherein the stirring blade is disposed upright in a position along the radial direction of the conical drum or in an inclined position forming a predetermined angle with respect to the radial direction.

6. A gravity separation device as described in claim 1, wherein a high specific gravity matter recovery pipe for recovering the high specific gravity matter from the discharge pipe is branched downward, and a separation action water supply section is provided for supplying the separation action water to the lower end of the discharge pipe and / or the high specific gravity matter recovery pipe.

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