Tailing scavenging cylinder

Abstract

The invention relates to a tailing scavenging cylinder, which belongs to the technical field of mineral separation and comprises an upper cylinder body, an inverted cone and a lower cylinder body, the upper end of the inverted cone is fixedly connected with the upper cylinder; an overflow groove is formed in the periphery of the upper cylinder body; an accommodating space is formed in the upper cylinder body, the inverted cone and the lower cylinder body; a middling collector is arranged in the accommodating space; a middling concentration hopper is arranged on the periphery of the lower barrel; an overflow weir is arranged at the uppermost end of the upper cylinder body; the lowermost end of the lower barrel is connected with an inner barrel of the mineral processing equipment and is used for receiving coarse tailings generated by the inner barrel; coarse-particle intergrowth minerals in the coarse tailings and part of entrained fine-particle concentrates are settled and recycled through the middling collector, then enter the middling concentration hopper and are concentrated through the middling concentration hopper to become middlings to be discharged, and the rest qualified tailings cross the overflow weir, leave the tailings scavenging barrel, enter the overflow groove and are discharged. The method solves the contradiction that traditional ore dressing equipment is used for obtaining high-grade concentrate products and reducing the product recovery rate.

Description

Technical Field

[0001] The present invention belongs to the technical field of mineral separation, and particularly relates to a tailings scavenging cylinder. Background Art

[0002] Ore dressing is a process of removing a large amount of gangue and harmful elements contained in ore, enriching useful minerals, or separating various coexisting useful minerals from each other to obtain concentrate products of one or several useful minerals. Traditional column magnetic separation or flotation equipment generally uses the dichotomy method for ore dressing. The feeder feeds the ore pulp to be processed into the magnetic separation or flotation equipment, and concentrate products or tailings are obtained at the bottom or top of the equipment respectively. To obtain a higher concentrate grade and product recovery rate, multiple stages of separation are required in the process. Through complex processes, the concentrate and tailings are scavenged and recovered multiple times, which not only increases the operation difficulty but also increases the equipment investment and production consumption. The disadvantage of the dichotomy method for ore dressing is that the separated minerals either enter the concentrate or the tailings. In cases where the ore feeding properties are unstable, the particle sizes are uneven or the particle size range is wide, and the mineral separability is not strong, the ore dressing indexes will fluctuate severely.

[0003] Taking the high-efficiency elutriation magnetic separator widely used in current ore dressing plants as an example, as a fine selection and control device, the elutriation magnetic separator is generally installed at the end of the separation process. Most of the tailings are low-grade lean intergrowths. On the premise of a certain grinding particle size, to obtain a higher iron concentrate grade, more relatively high-grade intergrowth particles need to be discarded and enter the tailings. To prevent the loss of iron concentrate, a strong magnetic salvage machine or a drum magnetic separator is used in the process to recover the intergrowth particles in the tailings. Due to the relatively fine particle size, weak magnetism, low tailings pulp concentration, and large volume of the tailings of the elutriation magnetic separator, the use of a strong magnetic salvage machine or a drum magnetic separator to recover the tailings has very poor effects. Especially when applied in the case of wide particle size feed where the magnetic concentrate has been slimeified and the intergrowth particles are relatively large, the fine magnetic particles need to be pulled downward by a strong magnetic field and discharged into the bottom concentrate area, while the coarse intergrowth particles need a larger upward flushing water to float up and overflow into the top tailings area. The fine magnetic particles are easily floated up by the larger upward flushing water, and the coarse intergrowth particles, due to containing a small amount of unseparated magnetic ore, are easily affected by the downward strong magnetic field and cannot overflow smoothly. There is an irreconcilable contradiction between improving the concentrate grade and ensuring the recovery rate.

[0004] The same problem also exists in the flotation column ore dressing process. Through the contact and attachment of hydrophobic mineral particles and bubbles, the mineral particle-bubble aggregates rise in the flotation column and form mineralized bubbles. After an interactive process of attachment-detachment-re-collision-re-detachment, the bubbles finally carry the mineral particles and float them to the liquid surface, and finally overflow the liquid surface and enter the foam layer. Especially during the process of overflowing the liquid surface and entering the foam layer, the coarse and heavy mineral particles are easily detached from the bubbles, resulting in a large amount of coarse particle minerals accumulating on the overflow surface and unable to enter and be separated. So far, there are few successful application cases of flotation columns in metal mines.

[0005] In traditional ore dressing processes, in order to improve the concentrate grade and reduce the tailings grade, generally the feed is ground and separated completely, the particle size of the minerals to be separated is reduced, and the particle size range is narrowed. However, doing so not only increases the grinding cost and separation cost, but may even cause serious problems of "over-grinding and slime formation", which in turn affects the ore dressing indexes. Summary of the Invention

[0006] In view of the above deficiencies of the prior art, the object of the invention is to provide a tailings scavenging cylinder, which can be used on various cylindrical, columnar, and trough-shaped ore dressing equipment. By secondary washing and separation of the incoming coarse tailings slurry and / or mineralized bubbles, the coarse particle associated minerals and part of the entrained fine-grained concentrate are collected. After being concentrated by the connected middlings thickening hopper, a higher concentration of middlings is obtained at the middlings outlet and returned to the process or enters the re-grinding and re-separation process, solving the contradiction that traditional ore dressing equipment leads to an increase in tailings grade and a decrease in product recovery rate in order to obtain high-grade concentrate products. In production, using the ore dressing equipment with the tailings scavenging cylinder of the present invention can only grind and separate a small amount of concentrated middlings, without the need to grind and separate all the minerals to be separated, greatly reducing the production cost.

[0007] The present invention provides a tailings scavenging cylinder, comprising: an upper cylinder body, an inverted cone, and a lower cylinder body;

[0008] The upper end of the inverted cone is fixedly connected to the upper cylinder body, and the lower end is fixedly connected to the lower cylinder body;

[0009] An overflow trough is arranged on the periphery of the upper cylinder body;

[0010] An accommodation space is formed inside the upper cylinder body, the inverted cone, and the lower cylinder body;

[0011] A middlings collector is arranged in the accommodation space;

[0012] A middlings thickening hopper is arranged on the periphery of the lower cylinder body;

[0013] The uppermost end of the upper cylinder body is an overflow weir;

[0014] The lowermost end of the lower cylinder body is connected to the inner cylinder body of the ore dressing equipment for receiving the tailings generated by the inner cylinder body;

[0015] Among them, the coarse particle associated minerals and part of the entrained fine-grained concentrate in the coarse tailings enter the middlings thickening hopper after being settled and recovered by the middlings collector, and become middlings and are discharged after being concentrated by the middlings thickening hopper. The remaining qualified tailings cross the overflow weir and leave the tailings scavenging cylinder and are discharged into the overflow trough.

[0016] Further, the upper opening of the lower cylinder body is higher than the highest point of the lower end of the middlings collector, and the protruding part forms a middlings cofferdam, which is used to prevent the coarse particle associated minerals settled on the surface of the middlings collector from returning to the inner cylinder body.

[0017] Furthermore, the surface area of the upper opening of the inverted cone is larger than that of the lower opening, such that the cross-sectional area of the overflow weir is larger than that of the inner cylinder.

[0018] Furthermore, the middlings collector includes a plurality of inclined plates and / or row-connected inclined tubes. The plurality of inclined plates and / or row-connected inclined tubes are stacked and inclined in a louver-shaped arrangement on the conical surface of the inverted cone. A sandwich layer is formed between the inclined plates and / or row-connected inclined tubes and the conical surface of the inverted cone. The inclined plates and / or row-connected inclined tubes are used to collect and settle the coarse particle associated minerals in the coarse tailings and part of the entrained fine-grained concentrate, and convey them to the middlings thickening hopper through the sandwich layer. The longitudinal sides of the inclined plates and / or row-connected inclined tubes are parallel to the generatrix of the inverted cone. The angle between the inclined plates and / or row-connected inclined tubes and the tangent plane of the generatrix of the inverted cone is between 5° and 90°. The upper ends of the inclined plates and / or row-connected inclined tubes are connected to the inner side of the upper cylinder, and the lower ends are connected to the outer side of the lower cylinder.

[0019] Furthermore, a middlings flushing water supply ring is provided at the connection between the inverted cone and the upper cylinder. The middlings flushing water supply ring is provided with a plurality of middlings flushing water holes. Each middlings flushing water hole is aligned with a gap between the inclined plates and / or row-connected inclined tubes arranged in a louver-shaped manner. The middlings flushing water supply ring is connected to an external water source through a middlings flushing water supply pipe, and a flushing water flow regulating valve is provided on the middlings flushing water supply pipe.

[0020] Furthermore, the adjustable-direction spray head or guide plate connected to the middlings flushing water hole is aligned with a gap between the inclined plates and / or row-connected inclined tubes arranged in a louver-shaped manner.

[0021] Furthermore, a middlings outlet is provided at the connection between the lower end of the inverted cone and the lower cylinder. The number of the middlings outlets is the same as the number of the middlings flushing water inlet holes, and the position of the middlings outlet corresponds to the position of the middlings flushing water inlet hole.

[0022] Furthermore, a middlings thickening hopper is provided below the sandwich layer and around the lower cylinder. The sandwich layer communicates with the middlings thickening hopper through the middlings outlet. The outer wall of the middlings thickening hopper is an extension of the upper cylinder, and the inner wall is a part of the lower cylinder. The bottom of the middlings thickening hopper is a downward-sloping slope with a gradient not less than 1:10. The number of the middlings thickening hoppers is at least 2. A middlings pipe is provided at the lowest part of the middlings thickening hopper, and a middlings flow regulating valve is provided at the lower end of the middlings pipe.

[0023] Furthermore, a middlings concentration transmitter is provided in the middle and lower part of the middlings thickening hopper, and an overflow concentration transmitter is provided on the upper cylinder;

[0024] The middlings flow regulating valve, the middlings concentration transmitter, and the overflow concentration transmitter are all electrically connected to the control circuit of the master controller;

[0025] The master controller changes the opening degree of the middlings flow regulating valve based on the overflow concentration to control the middlings flow in the middlings thickening hopper.

[0026] Furthermore, the top of the overflow tank is higher than the upper cylinder body. The bottom surface of the overflow tank is an inclined plane, and an overflow port is arranged at the bottom of the outer wall of the overflow tank.

[0027] The beneficial effects of the present invention are as follows:

[0028] The tailing scavenging cylinder provided by the present invention is used on various cylindrical, columnar, and trough-type ore dressing equipment. By performing secondary elutriation and separation on the incoming coarse tailing slurry and / or mineralized bubbles, the coarse-grained associated minerals and part of the entrained fine-grained concentrates are collected. After being concentrated by the connected middlings thickening hopper, a higher-concentration middlings is obtained at the middlings outlet and returned to the process or enters the regrinding and reseparation process, solving the contradiction that the traditional ore dressing equipment leads to an increase in the tailing grade and a decrease in the product recovery rate in order to obtain high-grade concentrate products. When using the ore dressing equipment with the tailing scavenging cylinder of the present invention in production, only a small amount of concentrated middlings needs to be ground and selected, and it is not necessary to grind and select all the incoming minerals, greatly reducing the production cost. Description of the Drawings

[0029] The drawings are only for the purpose of showing specific embodiments and are not considered to be a limitation of the present invention. Throughout the drawings, the same reference signs denote the same components. Obviously, the drawings in the following description are only some embodiments described in the embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings.

[0030] Figure 1 It is a schematic structural diagram of a tailing scavenging cylinder provided by an embodiment of the present invention.

[0031] Figure 2 It is a top view schematic diagram of a tailing scavenging cylinder provided by an embodiment of the present invention.

[0032] Figure 3 It is an A-A cross-sectional schematic diagram of a tailing scavenging cylinder provided by an embodiment of the present invention.

[0033] Figure 4 It is a magnified schematic diagram of part C of a tailing scavenging cylinder provided by an embodiment of the present invention.

[0034] Figure 5 It is a magnified schematic diagram of part B of a tailing scavenging cylinder provided by an embodiment of the present invention.

[0035] Figure 6 It is a D-D rotational cross-sectional schematic diagram of a tailing scavenging cylinder provided by an embodiment of the present invention.

[0036] Figure 7 It is a schematic structural diagram of a specific embodiment of a tailing scavenging cylinder provided by an embodiment of the present invention.

[0037] Figure 8A top view schematic diagram of a specific embodiment of the tailings scavenging cylinder provided by an embodiment of the present invention.

[0038] Figure 9 An E-E cross-sectional schematic diagram of a specific embodiment of the tailings scavenging cylinder provided by an embodiment of the present invention.

[0039] Figure 10 An enlarged schematic diagram of part F of a specific embodiment of the tailings scavenging cylinder provided by an embodiment of the present invention.

[0040] Figure 11 An enlarged schematic diagram of part 2G of an embodiment of the tailings scavenging cylinder provided by an embodiment of the present invention.

[0041] Figure 12 A 2H-H rotating cross-sectional schematic diagram of an embodiment of the tailings scavenging cylinder provided by an embodiment of the present invention.

[0042] Figure 13 A schematic diagram of the principle of the tailings scavenging cylinder provided by an embodiment of the present invention.

[0043] Figure 14 A schematic diagram of an application example of the tailings scavenging cylinder provided by an embodiment of the present invention.

[0044]

Reference Signs

[0045] 01, lower cylinder body; 02, inverted cone; 03, upper cylinder body; 04, overflow weir; 05, flushing water ring; 06, middlings thickening hopper; 07, middlings pipe; 08, middlings flow regulating valve; 09, inclined plate middlings collector; 10, flushing water supply pipe; 11, water inlet; 12, middlings outlet; 13, overflow concentration transmitter; 14, middlings concentration transmitter; 15, flushing water flow regulating valve; 16, interlayer; 17, middlings cofferdam; 18, overflow trough; 19 overflow port; 100, inner cylinder body; 200, tailings scavenging cylinder with tailings recovery system; 300, feeder; 400, excitation coil; 500, air supply device; 600, water supply device; 1001, sorting cylinder cylindrical part; 1002, balance column; 1003, thickening cone; 1004, concentrate flow regulating valve; 1005, middle part concentration transmitter; 1006, underflow concentration transmitter; 5001, microbubble generator; 5002, air flow regulating valve; 5003, air source; 6001, water supply pipe; 6002, water supply flow regulating valve. Detailed Embodiment

[0046] To enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, rather than all, of the embodiments of the present invention. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0047] In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concepts disclosed in the present invention.

[0048] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The terms "mounted", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0049] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. On the contrary, they are merely examples of methods and systems consistent with some aspects of the present invention as detailed in the appended claims.

[0050] The present invention provides a tailings scavenging cylinder to solve the irreconcilable contradiction between improving the concentrate grade and ensuring the recovery rate in existing beneficiation equipment. The traditional beneficiation process grinds and separates all the feed, which not only increases the grinding cost and separation cost, but even causes serious problems such as "over-grinding and slimeification", which in turn affects the beneficiation index.

[0051] Refer to the attached drawings of the specification Figures 1 to 14, a tailings scavenging cylinder provided by the present invention includes: an upper cylinder body 03, an inverted cone 02, and a lower cylinder body 01.

[0052] The upper end of the inverted cone 02 is fixedly connected to the upper cylinder body 03, and the lower end is fixedly connected to the lower cylinder body 01.

[0053] An overflow groove 18 is arranged on the periphery of the upper cylinder body 03.

[0054] An accommodation space is formed inside the upper cylinder body 03, the inverted cone 02, and the lower cylinder body 01.

[0055] A middlings collector 09 is arranged in the accommodation space.

[0056] A middlings thickening hopper 06 is arranged on the periphery of the lower cylinder body 01.

[0057] The uppermost end of the upper cylinder body 03 is an overflow weir 04.

[0058] The lowermost end of the lower cylinder body 01 is connected to the inner cylinder body 100 of the beneficiation equipment for receiving the coarse tailings generated by the inner cylinder body 100.

[0059] Optionally, the tailings may specifically be tailings slurry and / or mineralized bubbles.

[0060] It should be noted that the tailings scavenging cylinder of the present invention can be used in cooperation with various types of beneficiation equipment such as cylindrical, columnar, trough-type magnetic gravity beneficiation equipment, and columnar flotation equipment.

[0061] The working principle of the tailings scavenging cylinder is introduced below: The coarse particle associated minerals and part of the fine-grained concentrate entrained in the coarse tailings enter the middlings thickening hopper 06 after being settled and recovered by the middlings collector 09, and are discharged as middlings after being thickened by the middlings thickening hopper 06. The remaining qualified tailings cross the overflow weir 04 and leave the tailings scavenging cylinder to enter the overflow groove 18 for discharge.

[0062] For the convenience of description, the final tailings of the present invention refer to "the minerals overflowing through the overflow weir". The concentrate refers to "the minerals discharged from the bottom". In practical applications, according to the mineral properties and the target minerals, the "minerals overflowing through the overflow weir" can also be defined as the concentrate. Similarly, the "minerals discharged from the bottom" can be defined as the final tailings. This does not affect the protection scope of the present invention.

[0063] The beneficial effects of the present invention are as follows:

[0064] The tailings scavenging cylinder provided by the present invention is used on various cylindrical, columnar, and trough-type ore dressing equipment. By performing secondary elutriation and separation on the incoming coarse tailings slurry and / or mineralized bubbles, the coarse-grained associated minerals and some entrained fine-grained concentrates are collected. After being concentrated by the connected middlings thickening hopper, a higher-concentration middlings is obtained at the middlings outlet and returned to the process or enters the regrinding and reseparation process, solving the contradiction that the traditional ore dressing equipment causes the increase of tailings grade and the reduction of product recovery rate in order to obtain high-grade concentrate products. In production, the ore dressing equipment with the tailings scavenging cylinder of the present invention can only grind and separate a small amount of concentrated middlings, without the need to grind and separate all the incoming minerals, greatly reducing the production cost.

[0065] In a possible implementation manner, the upper opening of the lower cylinder body 01 is higher than the highest point of the lower end of the middlings collector 09, and the protruding part forms a middlings cofferdam 17. The middlings cofferdam 17 is used to prevent the coarse-grained associated minerals settling on the surface of the middlings collector 09 from returning to the inner cylinder body 100.

[0066] In the present invention, the coarse-grained minerals settling on the surface of the middlings collector 09 are blocked from returning to the inner cylinder body 100 by the middlings cofferdam 17, thus ensuring the grade of the concentrate. The tailings scavenging cylinder can effectively prevent the entrained or wrapped fine-grained concentrates from crossing the overflow weir and entering the tailings. This is not only conducive to meeting the tailings discharge standard and improving the product recovery rate, but also reduces the tailings reprocessing link and improves the separation and selection efficiency of the concentrate and tailings.

[0067] In a possible implementation manner, the upper surface area of the inverted cone 02 installed in an inverted manner is larger than the lower surface area, so that the cross-sectional area of the overflow weir 04 is larger than the cross-sectional area of the inner cylinder body 100.

[0068] It should be noted that during operation, water or bubbles are supplied at the bottom of the inner cylinder body 100 to generate an upward buoyancy force, floating the impurities and / or hydrophobic particles with small density and large particle size in the pulp to the inside of the tailings scavenging cylinder. Affected by the expansion of the cross-sectional area of the overflow weir of the tailings scavenging cylinder, after the pulp enters the tailings scavenging cylinder, the flow rate becomes smaller. The coarse-grained associated minerals in the tailings and some entrained fine-grained concentrates settle during the radial movement towards the overflow weir, and are blocked by the overflow weir 04 and move down along the side wall of the tailings scavenging cylinder to the inside of the middlings collector 09 near the bottom inverted cone 02.

[0069] In the present invention, by inversely installing the inverted cone 02 such that the surface area of its upper opening is larger than that of its lower opening, the cross-sectional area of the overflow weir 04 is made larger than the cross-sectional area of the inner cylinder 100, which can effectively slow down the flow rate of the pulp and promote the settlement of the coarse particle intergrowth minerals in the coarse tailings and part of the entrained fine-grained concentrate. When the pulp enters the tailings scavenging cylinder, the flow rate decreases, and the coarse particle intergrowth minerals in the coarse tailings and part of the entrained fine-grained concentrate settle during the radial movement and are blocked by the overflow weir, and finally are concentrated in the middlings collector 09 near the inverted cone, which helps to improve the separation efficiency of solid particles, reduce the content of useful minerals in the tailings, and optimize the ore dressing indexes.

[0070] In a possible implementation manner, the middlings collector 09 includes a plurality of inclined plates and / or row-connected inclined tubes, and the plurality of inclined plates and / or row-connected inclined tubes are stacked and inclined in a louver-shaped arrangement on the conical surface of the inverted cone 02. An interlayer 16 is formed between the inclined plates and / or row-connected inclined tubes and the conical surface of the inverted cone 02. The inclined plates and / or row-connected inclined tubes 09 are used to collect and settle the coarse particle intergrowth minerals in the coarse tailings and part of the entrained fine-grained concentrate, and convey them to the middlings thickening hopper 06 through the interlayer 16. The longitudinal sides of the inclined plates and / or row-connected inclined tubes are parallel to the generatrix of the inverted cone 02, and the angle between the inclined plates and / or row-connected inclined tubes and the tangent plane of the generatrix of the inverted cone 02 is between 5° and 90°. The upper ends of the inclined plates and / or row-connected inclined tubes are connected to the inner side of the upper cylinder 03, and the lower ends are connected to the outer side of the lower cylinder 01.

[0071] In the present invention, by arranging a plurality of inclined plates and / or row-connected inclined tubes in a louver-shaped arrangement and inclining them on the conical surface of the inverted cone 02 to form the interlayer 16, the settlement area of the coarse particle intergrowth minerals in the coarse tailings and part of the entrained fine-grained concentrate can be effectively enlarged. It helps to increase the settlement speed of solid particles, enables more coarse particle minerals and concentrate to settle into the middlings collector 09, and at the same time avoids the secondary floating of fine particles. The settled particles are conveyed to the middlings thickening hopper 06 through the interlayer 16, thereby improving the recovery efficiency of the middlings and contributing to the effective separation of the concentrate and the tailings.

[0072] In a possible implementation manner, a middlings flushing water supply ring 05 is provided at the connection between the inverted cone 02 and the upper cylinder 03. The middlings flushing water supply ring 05 is provided with a plurality of middlings flushing water holes 11, and each middlings flushing water hole 11 is aligned with a gap between the inclined plates and / or row-connected inclined tubes arranged in a louver-shaped manner. The middlings flushing water supply ring 05 is connected to an external water source through a middlings flushing water supply pipe 10, and a flushing water flow regulating valve 15 is provided on the middlings flushing water supply pipe 10.

[0073] In the present invention, by arranging a middlings flushing water supply ring 05 at the connection between the inverted cone 02 and the upper cylinder 03 and flushing through a plurality of middlings flushing water holes 11 aiming at the gaps between the inclined plates and / or the row of inclined tubes, the coarse-grained minerals deposited on the surface of the inclined plates can be effectively cleaned. The flushing water can help the coarse-grained intergrown minerals to settle and then quickly slide down along the inclined plates to the middlings outlet for discharge. Meanwhile, by arranging a flushing water flow regulating valve 15, the flow rate of the flushing water is precisely controlled to effectively control the secondary floating of the settled fine-grained minerals. Among them, the light minerals are lifted and returned to the overflow surface to overflow and become the final tailings, and the entrained fine-grained concentrates are returned to the inner cylinder of the beneficiation equipment. The secondary elutriation and separation of the tailings are realized.

[0074] In a possible implementation manner, an adjustable-direction sprinkler head or a guide plate 111 connected to the middlings flushing water hole 11 aims at one of the gaps between the inclined plates and / or the row of inclined tubes arranged in a louver shape.

[0075] In the present invention, by flushing through an adjustable-direction sprinkler head or a guide plate 111 aiming at one of the gaps between the inclined plates and / or the row of inclined tubes arranged in a louver shape, the washing and beneficiation efficiency of the flushing water can be effectively improved.

[0076] In a possible implementation manner, a middlings outlet 12 is arranged at the connection between the lower end of the inverted cone 02 and the lower cylinder 01. The number of the middlings outlets 12 is the same as the number of the middlings flushing water inlet holes 11, and the position of the middlings outlet 12 corresponds to the position of the middlings flushing water inlet hole 11.

[0077] In the present invention, by arranging a middlings outlet 12 at the connection between the inverted cone 02 and the lower cylinder 01 and making its number the same as that of the middlings flushing water inlet holes 11 and the positions corresponding to each other, the effective distribution of the flushing water flow and the precise discharge of the middlings can be realized. It can ensure that the flushing water can evenly clean the gaps between the inclined plates and / or the row of inclined tubes, and the middlings can be effectively recovered.

[0078] In a possible implementation manner, middlings thickening hoppers 06 are arranged below the interlayer 16 and around the lower cylinder 01. The interlayer 16 is communicated with the middlings thickening hoppers 06 through the middlings outlets 12. The outer wall of the middlings thickening hopper 06 is an extension of the upper cylinder 03, and the inner wall is a part of the lower cylinder 01. The bottom of the middlings thickening hopper 06 is a downward-sloping slope with a slope not less than 1:10. The number of the middlings thickening hoppers 06 is at least 2. A middlings pipe 07 is arranged at the lowest part of the middlings thickening hopper 06, and a middlings flow regulating valve 08 is arranged at the lower end of the middlings pipe 07.

[0079] It should be noted that the structural design of the middlings thickening hopper 06 not only makes full use of the equipment body structure. Arranging a plurality of middlings thickening hoppers reduces the equipment height while ensuring the thickening effect, and realizes the self-flow discharge of the middlings.

[0080] In the present invention, the middlings thickening hopper 06 with a special structure is provided to realize the elutriation and thickening of the middlings. The bottom of the middlings thickening hopper 06 is a downward-sloping slope, which is beneficial to the settlement of the middlings particles. A middlings pipe 07, a middlings flow regulating valve 08 are arranged at the lowest part of the middlings thickening hopper 06, and a middlings concentration transmitter 14 is arranged in the middle and lower part of the middlings thickening hopper 06 and is electrically connected to the control circuit of the master controller. This not only helps to control the tailing running over the overflow weir and improve the product recovery rate, but also increases the concentration of the recovered middlings, solving the problem of difficult recovery of the tailings of the elutriation magnetic separator or the magnetic flotation machine. A plurality of middlings thickening hoppers are arranged around the outer cylinder of the main equipment. While ensuring the thickening effect, the equipment height is reduced, the self-flow discharge of the middlings is realized, and the plant height and the conveying cost of the middlings pulp can be greatly reduced.

[0081] In a possible implementation manner, a middlings concentration transmitter 14 is arranged in the middle and lower part of the middlings thickening hopper 06, and an overflow concentration transmitter 13 is arranged on the upper cylinder 03. The middlings flow regulating valve 08, the middlings concentration transmitter 14 and the overflow concentration transmitter 13 are all electrically connected to the control circuit of the master controller. The master controller changes the opening degree of the middlings flow regulating valve 08 based on the overflow concentration to control the middlings flow in the middlings thickening hopper 06.

[0082] In the present invention, changing the opening degree of the middlings flow regulating valve 08 based on the overflow concentration to control the middlings flow in the middlings thickening hopper 06 not only helps to control the tailing running over the overflow weir 04, but also helps to control the discharge concentration and discharge amount of the middlings, solving the problems of low concentration and difficult recovery of the tailings of the elutriation magnetic separator or the magnetic flotation machine.

[0083] In a possible implementation manner, the top of the overflow trough 18 is higher than the upper cylinder 03, the bottom surface of the overflow trough 18 is an inclined plane, and an overflow port 19 is arranged at the bottom of the outer wall of the overflow trough 18.

[0084] In the present invention, by using the inclined structure of the overflow trough 18, it is ensured that the tailings pulp can flow smoothly and avoid blockage. At the same time, through the setting higher than the upper cylinder, the discharge efficiency of the tailings is enhanced, ensuring that the fine particles and mineralized bubbles in the tailings can be quickly discharged, improving the working efficiency of the whole system.

[0085] The middlings recovery by the tailings scavenging cylinder of the present invention avoids the return of low-grade coarse-grained minerals to the bottom concentrate, resulting in a reduction in the concentrate grade or directly floating into the tailings to increase the tailing running over. It can not only improve the concentrate grade, but also reduce the tailings grade at the same time. The independent control of the tailings grade and the concentrate grade is realized. The application range and the feed particle size range of the elutriation magnetic separator or the magnetic flotation column are broadened. The tailings water of the tailings scavenging cylinder of the present invention can also be used as makeup water for secondary recycling in the concentrator, reducing the production cost.

[0086] Further, two implementation cases are designed according to different ways of discharging the flushing water.

[0087] The first implementation scheme is specifically as follows: A middlings flushing water supply ring 05 is arranged above the connection line between the inverted cone 02 and the upper cylinder 03. A plurality of middlings flushing water holes 11 are arranged at the highest point of the inclined plate and the interlayer 16, which are connected to the middlings flushing water supply ring 05. The adjustable-direction spray heads or guide plates 111 connected to each middlings flushing water hole 11 are aligned with a gap between the inclined plates arranged in a louver shape, and flush the surface of the inclined plate obliquely downward along the direction of the gap. The main function of the flushing water is to quickly separate the coarse-grained minerals settled on the surface of the inclined plate from the middlings collection area, and enter the middlings hopper through the channel of the interlayer 16. This can prevent the coarse-grained minerals from floating up again and entering the final tailings.

[0088] The middlings flushing water supply ring 05 is connected to an external water source through a middlings flushing water supply pipe 10. A flushing water flow regulating valve 15 is arranged on the middlings flushing water supply pipe 10.

[0089] Furthermore, a middlings outlet 12 is arranged at the connection between the lower end of the inverted cone 02 and the cylindrical inner cylinder (1) of the tailings scavenging cylinder. The number of the middlings outlets 12 is the same as that of the middlings flushing water inlet holes 11, and their circumferential positions correspond to each other.

[0090] The second implementation scheme is specifically as follows: A middlings flushing water supply ring 05 is arranged in the interlayer 16 with the inverted cone 02 as the bottom. The middlings flushing water supply ring 05 is provided with a plurality of middlings flushing water holes 11 facing obliquely upward. The guide plates 111 (not shown in the figure) connected to each middlings flushing water hole 11 are aligned with a gap between the inclined plates arranged in a louver shape and / or the row of inclined pipes 09. A plurality of middlings flushing water holes 11 are arranged at the lowest point of the corresponding interlayer 16. The main function of the flushing water is to wash the granular minerals settled on the surface of the inclined plate in the middlings collection area, raise the light fine-grained minerals and return them to the overflow surface, and only allow the coarse-grained minerals to enter the middlings hopper.

[0091] The middlings flushing water supply ring 05 is connected to an external water source through a middlings flushing water supply pipe 10. A flushing water flow regulating valve 15 is arranged on the middlings flushing water supply pipe 10.

[0092] Furthermore, a middlings outlet 12 is arranged at the connection between the lower end of the inverted cone 02 and the cylindrical inner cylinder 01 of the tailings scavenging cylinder. The number of the middlings outlets 12 is the same as that of the middlings flushing water inlet holes 11, and their circumferential positions correspond to each other.

[0093] For example, a scheme of using the above-mentioned tailings scavenging cylinder combined with a traditional elutriation magnetic separator to form an elutriation magnetic separator with a middlings recovery system is described. It should be noted that new schemes can also be formed by combining the tailings scavenging cylinder with other beneficiation equipment such as magnetic flotation columns and flotation columns.

[0094] Scheme of a rinsing magnetic separator with a middlings recovery system: The lower cylinder 01 is connected to the separation cylinder 100 of the rinsing magnetic separator, and the two are coaxial and of the same diameter; The outer wall of the middlings thickening hopper 06 is an extension of the upper cylinder 03 and is connected to the outer cylinder 1001 of the rinsing magnetic separator, and the two are coaxially and seamlessly connected; A plurality of exciting coils 400 are arranged between the periphery of the separation cylinder 100 and the outer cylinder 1001 of the rinsing magnetic separator; The lower end of the separation cylinder 100 is fixedly connected to the thickening cone 1003, and a water supply device 600 is arranged at the lower part of the separation cylinder 100. The water supply device 600 is communicated with the inner cylinder 100; One end of the outer side of the water supply pipe 600 is fixedly connected with a water supply flow regulating valve 6002, and the water supply flow regulating valve 6002 controls the water injection of the water supply pipe 6001 into the inner cylinder 100. The lower end of the thickening cone 1003 is the concentrate outlet, and a concentrate flow regulating valve 1004 is arranged on the concentrate outlet. A middle concentration transmitter 1005 is arranged in the middle of the separation cylinder 100; A underflow concentration transmitter 1006 is arranged on the side wall of the thickening cone 1003. The control circuits of the overflow concentration transmitter 13, the middle concentration transmitter 1005, the underflow concentration transmitter 1006, and the concentrate regulating valve 1005 are electrically connected to the main controller;

[0095] The electromagnetic coils 400 are in multiple groups. The multiple groups of electromagnetic coils 400 are electrically connected to the control circuit of the main controller, and are energized and de-energized according to a certain rule to generate a pulsating magnetic field with a downward direction.

[0096] The working process of a scheme of a rinsing magnetic separator with a middlings recovery system is as follows:

[0097] During operation, the processed magnetite pulp is fed into the upper middle part of the inner cylinder 100 of the rinsing magnetic separator through a feeder and spreads out. Among them, the strongly magnetic particles, under the action of the downward magnetic force and gravity generated by the exciting coil, overcome the buoyancy of the rising water and move downward into the thickening cone 1003. After concentration, they are discharged through the concentrate valve to form iron concentrate. The weakly magnetic or non-magnetic minerals are affected by the buoyancy of the rising water greater than the gravity. Part of them are floated up into the connected tailings scavenging cylinder, continue to rise through the inverted cone 02 to the overflow weir, cross the overflow weir 04 and leave the tailings scavenging cylinder to enter the overflow tank 18 and be discharged as the final tailings. Among them, the coarse-grained minerals and the fine-grained and high-density iron ore particles with greater gravity settle down and cannot cross the overflow weir 04. They fall back onto the inclined plate louvers and slide down from the inclined plate into the interlayer 16, flow out through the middlings outlet into the middlings thickening hopper and are discharged as middlings. "One inlet and three outlets" realizes the separation of concentrate, middlings, and tailings.

[0098] An overflow concentration transmitter 13 is arranged on the upper cylinder 03, and a middle concentration transmitter 1005 is arranged in the middle of the separation cylinder 100; A underflow concentration transmitter 1006 is arranged on the side wall of the thickening cone 1003. A concentrate regulating valve 1005 is fixedly connected to the bottom of the conical thickener 1004; The control circuits of the overflow concentration transmitter 13, the middle concentration transmitter 1005, the underflow concentration transmitter 1006, and the concentrate regulating valve 1005 are electrically connected to the main controller;

[0099]

[0099] The master controller adjusts the magnetic field intensity, the water supply flow regulating valve 6002, and the flushing water flow regulating valve 15 based on the first preset parameter of the overflow concentration. The opening degree of the concentrate regulating valve 1005 is adjusted based on the second preset parameter of the underflow concentration. The middle ore flow in the middle ore thickener 06 is controlled by the middle ore flow regulating valve 08, and indirectly controls the amount of tailings discharged through the overflow weir 04. By adjusting the concentrate regulating valve 1005 to control the concentrate discharge amount, independent control of the tailings grade and the concentrate grade is achieved. The application range and the feed particle size range of the elutriation magnetic separator are broadened.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Any changes or replacements that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A tailings sweeping drum, characterized in that: include: An upper cylinder, an inverted cone and a lower cylinder; The upper end of the inverted cone is fixedly connected to the upper cylinder, and the lower end is fixedly connected to the lower cylinder; An overflow groove is arranged on the periphery of the upper cylinder; The upper cylinder, the inverted cone and the lower cylinder form an accommodating space; A middling collector is provided in the accommodating space; A middling ore concentrating bucket is arranged on the periphery of the lower cylinder; The uppermost end of the upper cylinder is an overflow weir; The lower end of the lower cylinder is connected to the inner cylinder of the ore dressing equipment, and is used to receive the coarse tailings produced by the inner cylinder; Among them, the coarse-grained intergrowth minerals and part of the entrained fine-grained concentrate in the coarse tailings are settled and recovered by the medium ore collector and then enter the medium ore concentrator. After being concentrated by the medium ore concentrator, they become medium ore and are discharged. The remaining qualified tailings pass over the overflow weir, leave the tailings scavenging drum, and enter the overflow tank for discharge.

2. The tailings scavenging drum according to claim 1, characterized in that: The upper opening of the lower cylinder is higher than the highest point of the lower end of the mid-ore collector, and the higher part forms a mid-ore cofferdam, which is used to prevent the coarse intergrowth mineral particles that settle to the surface of the mid-ore collector from returning to the inner cylinder.

3. The tailings scavenging drum according to claim 1, characterized in that: The upper surface area of ​​the inverted cone is larger than the lower surface area, so that the cross-sectional area of ​​the overflow weir is larger than the cross-sectional area of ​​the inner cylinder.

4. The tailings scavenging drum according to claim 1, characterized in that: The intermediate ore collector comprises a plurality of inclined plates and / or inter-row inclined tubes, which are stacked and inclinedly arranged in a louver-like manner on the conical surface of the inverted cone, and a sandwich is formed between the inclined plates and / or inter-row inclined tubes and the conical surface of the inverted cone. The inclined plates and / or inter-row inclined tubes are used to collect and settle coarse-grained intergrown minerals in coarse tailings and part of the entrained fine-grained concentrate, and transport them to the intermediate ore concentrator through the sandwich. The longitudinal sides of the inclined plates and / or inter-row inclined tubes are parallel to the generatrix of the inverted cone, and the angle between the tangent plane of the inclined plates and / or inter-row inclined tubes and the generatrix of the inverted cone is between 5° and 90°. The upper ends of the inclined plates and / or inter-row inclined tubes are connected to the inner side of the upper cylinder, and the lower ends are connected to the outer side of the lower cylinder.

5. The tailings scavenging drum according to claim 4, characterized in that: A middle mine flushing water supply ring is arranged at the connection between the inverted cone and the upper cylinder, and the middle mine flushing water supply ring is provided with a plurality of middle mine flushing water holes, each of the middle mine flushing water holes is aligned with a gap between the inclined plates and / or the connected inclined pipes arranged in a louver shape, the middle mine flushing water supply ring is connected to an external water source through a middle mine flushing water supply pipe, and a flushing water flow regulating valve is arranged on the middle mine flushing water supply pipe.

6. The tailings scavenging drum according to claim 5, characterized in that: The adjustable direction water spray head or guide plate connected to the intermediate ore flushing water hole is aligned with a gap between the inclined plates and / or the connected inclined pipes arranged in a shutter shape.

7. The tailings scavenging drum according to claim 5, characterized in that: A middle ore outlet is provided at the connection between the lower end of the inverted cone and the lower cylinder, the number of the middle ore outlets is the same as the number of the middle ore flushing water inlet holes, and the positions of the middle ore outlets correspond to the positions of the middle ore flushing water inlet holes.

8. The tailings scavenging drum according to claim 7, characterized in that: The middling ore concentrator is arranged below the interlayer and on the periphery of the lower cylinder. The interlayer is connected to the middling ore concentrator through the middling ore outlet. The outer wall of the middling ore concentrator is an extension of the upper cylinder, and the inner wall is a part of the lower cylinder. The bottom of the middling ore concentrator is a downward sloping surface with a slope of not less than 1:

10. The number of the middling ore concentrators is at least 2. A middling ore pipe is arranged at the lowest point of the middling ore concentrator, and a middling ore flow regulating valve is arranged at the lower end of the middling ore pipe.

9. The tailings scavenging drum according to claim 8, characterized in that: A middling concentration transmitter is provided at the middle and lower part of the middling concentration hopper, and an overflow concentration transmitter is provided on the upper cylinder; The intermediate ore flow regulating valve, the intermediate ore concentration transmitter and the overflow concentration transmitter are all electrically connected to the control circuit of the master controller; The master controller changes the opening of the intermediate ore flow regulating valve based on the overflow concentration to control the intermediate ore flow of the intermediate ore concentrator.

10. The tailings scavenging drum according to claim 1, characterized in that: The top of the overflow trough is higher than the upper cylinder, the bottom surface of the overflow trough is an inclined plane, and an overflow port is arranged at the bottom of the outer wall of the overflow trough.

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