Continuous particle filtration device

Abstract

The present invention discloses a continuous particle filtration device. The device includes: a device main body, a particle filtration layer and a grid plate sequentially arranged inside the device main body from top to bottom, and a liquid inlet pipe; the outer peripheral surface of the particle filtration layer is fixedly attached to the inner wall of the device main body; the outer peripheral surface of the grid plate is fixedly attached to the inner wall of the device main body; the liquid inlet pipe is inserted into the device main body from the top of the device main body, and the end extends out of the particle filtration layer and is located above the grid plate; an overflow outlet is arranged at the upper part of the device main body, and the overflow outlet is located above the particle filtration layer. The device can achieve fine filtration of the pre-extraction liquid, reduce suspended substances, and meet the water inlet requirements of the thickener; and it can continuously filter for a long time, and has the advantages of simple structure, convenient operation and cleaning; the device is determined and verified through simulation. The results show that when filtering, the liquid and flow rate inside it can both achieve the effect of uniform distribution.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrometallurgy, and particularly to a continuous particle filtration device in the process of copper smelting by wet process. Background Art

[0002] In the process of copper smelting by wet process, after copper oxide is leached with sulfuric acid, solid-liquid separation is carried out by a thickener. A small amount of suspended matter will be contained in the overflow of the thickener and cannot directly enter the extraction section. It must be filtered by a filter to reduce the suspended matter in the pre-extraction liquid to meet the water inlet requirements. In a certain laterite nickel ore project, in its technological process, there is a step of pulp thickening. The same situation of overflow of the original ore thickener will occur during pulp thickening, and it is necessary to filter the overflow of the original ore thickener to recover the overflow original ore grade purification wash water.

[0003] Chinese application CN201911333227.7 discloses a metal particle filtration device in sewage, which includes a stirring and impurity removal chamber and a metal particle adsorption chamber arranged on the inner wall of the stirring and impurity removal chamber. Chinese patent CN201820616745.4 discloses a double-layer particle filtration device based on foam alloy, including a filtration box body, a catalytic oxidation device, a soot collection chamber and a soot filtration device. Chinese patent CN201821934757.8 discloses a solid particle filtration device and an air purification device, which relates to the technical field of spraying air purification equipment.

[0004] When the equipment in the above-mentioned existing patents is applied to the process of copper smelting by wet process, there will be many problems: for example, it cannot continuously filter for a long time; the filtration effect is not good and cannot meet the water inlet requirements of the thickener; the structure is complex, it is inconvenient to use and clean, and the service life of the equipment is short. Therefore, it is necessary to study a new type of device that can effectively filter the overflow liquid of the thickener containing suspended matter in the process of copper smelting by wet process. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a continuous particle filtration device to solve the problem that the existing technology cannot effectively filter the overflow liquid of the thickener containing suspended matter in the process of copper smelting by wet process.

[0006] The above object of the present invention is achieved by the following technical solutions:

[0007] According to one aspect of the present invention, a continuous particle filtration device provided by the present invention includes: a device main body, a particle filtration layer and a grid plate sequentially arranged inside the device main body from top to bottom, and a liquid inlet pipe; wherein,

[0008] The outer peripheral surface of the particle filtration layer is fixedly attached to the inner wall of the device main body;

[0009] The outer peripheral surface of the grid plate is fixedly attached to the inner wall of the device main body;

[0010] The liquid inlet pipe is inserted into the interior of the equipment main body from the top of the equipment main body, and the end of the liquid inlet pipe extends out of the particle filtration layer and is located above the grid plate.

[0011] An overflow port is provided in the upper part of the equipment main body, and the overflow port is located above the particle filtration layer.

[0012] Preferably, the diameter of the equipment main body can be 150 - 3000 mm, the distance between the end of the liquid inlet pipe and the particle filtration layer can be 200 - 1000 mm. The distance between the end of the liquid inlet pipe and the grid plate can be 200 - 2500 mm. The distance between the grid plate and the bottom end of the equipment main body can be 200 - 3000 mm. The distance between the particle filtration layer and the top end of the equipment main body can be 100 - 1000 mm.

[0013] Preferably, the thickness of the particle filtration layer is 300 - 500 mm; the particle size in the particle filtration layer is 0.8 - 4 mm. More preferably, the thickness of the particle filtration layer is 400 mm; the particle size in the particle filtration layer is 1 mm.

[0014] Preferably, the device further includes: a fixing member fixedly arranged on the inner wall of the equipment main body for fixing the liquid inlet pipe, and the fixing member is located between the particle filtration layer and the grid plate. Further, the fixing member can be: a rod-shaped structure with a through hole in the middle, or a porous plate-shaped structure. Further still, a resistance element can be arranged on the outer periphery of the through hole of the rod-shaped structure to increase the friction between the fixing member and the liquid inlet pipe, facilitating the fixing of the position of the liquid inlet pipe.

[0015] Preferably, the grid plates are multiple and are arranged in parallel at intervals along the vertical direction of the equipment main body.

[0016] Preferably, the thickness of the grid plate is 40 - 80 mm, and the distance between two adjacent grid plates is 180 - 220 mm. More preferably, the thickness of the grid plate is 60 mm, and the distance between two adjacent grid plates is 200 mm.

[0017] Preferably, the grid plate is a grid-like structure.

[0018] Preferably, the grid-like structure includes: one of rectangular grids (such as in the form of a staggered brick wall or a cross-cross form), triangular grids, and parallelogram grids.

[0019] More preferably, the grid plate is a cross-cross rectangular grid-like structure formed by inserting multiple flat plates.

[0020] Compared with the prior art, the novel particle continuous filtration device of the present invention can achieve fine filtration of the pre-extraction liquid, reduce suspended solids, and the filtration result meets the water inlet requirements of the thickener; moreover, this device can continuously filter for a long time, and has the advantages of simple structure, convenient operation and cleaning; in addition, the particle continuous filtration device of the present invention determines and verifies the design of the device through simulation. The results show that when this device filters, the liquid and its flow rate inside can both achieve a uniform distribution effect, thereby further improving the filtration effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the particle continuous filtration device of the present invention;

[0022] Figure 2 is a schematic connection structure diagram of the fixing member in the particle continuous filtration device of the present invention;

[0023] Figures 3a - 3d are respectively schematic diagrams of four mesh-like structures of the grid plate of the present invention;

[0024] Figure 4 is a schematic structural diagram of a preferred embodiment of the grid plate of the present invention;

[0025] Figure 5a , 5c , 5d are schematic diagrams of the simulation model and fluid flow simulation results of the particle continuous filtration device of the present invention;

[0026] Figure 5b is a schematic diagram of the fluid flow simulation result inside the device without adding the grid plate.

[0027] Figures 1 - 2 In the figure, 1 is the device main body, 2 is the liquid inlet pipe, 3 is the overflow port, 31 is the overflow pipe, 4 is the particle filter layer, 5 is the grid plate, and 6 is the fixing member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention:

[0029] Figure 1 Schematically shows the structure of the particle continuous filtration device of the present invention. As Figure 1As shown in the figure, a continuous particle filtration device provided by the present invention includes: a device main body 1, a particle filtration layer 4 and a grid plate 5 sequentially arranged inside the device main body 1 from top to bottom, and a liquid inlet pipe 2. An overflow port 3 is arranged at the upper part of the device main body. Among them, the outer peripheral surface of the particle filtration layer 4 is fixedly attached to the inner wall of the device main body 1; the outer peripheral surface of the grid plate 5 is fixedly attached to the inner wall of the device main body 1; the liquid inlet pipe 2 is inserted into the device main body 1 from the top of the device main body 1, and the end of the liquid inlet pipe 2 extends out of the particle filtration layer 4 and is located above the grid plate 5; the overflow port 3 is located above the particle filtration layer 4.

[0030] In the present invention, the thickener overflow liquid containing suspended matter is directly sent to the lower part of the particle filtration layer 4 through the liquid inlet pipe 2. After flowing to the grid plate 5, it flows downward to the bottom end of the device main body 1 and then flows upward in the reverse direction. After passing through the grid plate 5 again, it reaches the bottom of the particle filtration layer 4, and then passes through the particle filtration layer 4 for filtration. After filtration, it overflows from the overflow port 3 through the overflow pipe 31, thereby realizing effective fine filtration of the liquid before extraction, reducing the concentration of suspended matter in the thickener overflow liquid, making it meet the water inlet requirements of the thickener, and this device can continuously filter for a long time.

[0031] It should be noted that the continuous particle filtration device of the present invention is not only applicable to the filtration of the thickener overflow liquid containing suspended matter in the process of hydrometallurgical copper smelting, but also can be applied to the filtration of overflow liquid or other liquids in other field projects.

[0032] In the present invention, the diameter of the liquid inlet pipe 2 can be about 240 mm. A distance is maintained between the end of the liquid inlet pipe 2 and the particle filtration layer 4, for example, it can be 200 - 1000 mm. A distance is maintained between the end of the liquid inlet pipe 2 and the grid plate 5, for example, it can be 200 - 2500 mm. A distance is maintained between the grid plate 5 and the bottom end of the device main body 1, for example, it can be 200 - 3000 mm. A distance is maintained between the particle filtration layer 4 and the top end of the device main body 1, for example, it can be 100 - 1000 mm. The overflow port 3 is arranged on the side wall of the device main body 1 and is at a distance from the top of the device main body 1 and the particle filtration layer 4 respectively. For example, it can be 30 mm - 200 mm from the top of the device main body 1. An overflow pipe 31 is connected to the overflow port 3, and a valve can be arranged on the overflow pipe 31. The diameter of the device main body 1 in the present invention can be 150 - 3000 mm, but is not limited thereto. The setting of the above preferred distances can better ensure the re-distribution of the flow rate and the effect of uniform distribution of the flow rate of the thickener overflow liquid in the device main body 1.

[0033] The granular filter layer 4 realizes the filtration of suspended matter, and its thickness can be 300 - 500 mm, for example, it can be 400 mm; the particles in the granular filter layer 4 are evenly distributed, and the particle size can be 0.8 - 4.0 mm, for example, it can be 1 mm. Here, the particle size can be, for example, the diameter, side length, etc. The particles in the granular filter layer 4 can be, for example, expandable polystyrene white foam microbeads. This material has the advantages of light weight, uniform distribution of microbeads, high porosity, large specific surface area, strong adsorption capacity, good filtration effect, strong decontamination ability, corrosion resistance, not easy to break, and long service life. It is a very good floating filter material. In the present invention, the overflow liquid of the thickener flows through the granular filter layer 4 from bottom to top for filtration. On the one hand, the filtration effect is improved, and on the other hand, the granular filter layer 4 is less likely to be blocked. Some sundries can fall off automatically under the action of gravity, making the subsequent backwashing more convenient and simple.

[0034] In an alternative embodiment, the device further includes a fixing member 6 fixedly arranged on the inner wall of the equipment main body 1 for fixing the liquid inlet pipe 2. Figure 2 Schematically shows the installation structure diagram of the fixing member 6 in this alternative embodiment. As Figure 2 shown, the fixing member 6 is located between the granular filter layer 4 and the grid plate 5. Among them, the fixing member 6 can be: a rod-shaped structure with a through hole in the middle, a porous plate-shaped structure, a clamping-shaped structure, etc., existing structures with a fixing effect. For example, a resistance element can also be arranged on the outer periphery of the through hole of the rod-shaped structure to increase the friction between the fixing member 6 and the liquid inlet pipe 2, facilitate the fixing of the position of the liquid inlet pipe 2, and further prevent the liquid inlet pipe 2 from moving due to liquid resistance.

[0035] In an alternative embodiment, multiple grid plates 5 in the equipment main body 1 can be provided. As Figure 1 and Figure 2 shown, two are provided in both cases, and they are arranged parallel and spaced apart along the vertical direction of the equipment main body 1. Among them, the thickness of the grid plate 5 can be 40 - 80 mm, for example, it can be 60 mm, and the spacing between two adjacent grid plates 5 can be 180 - 220 mm, for example, it can be 200 mm. The setting of the grid plate 5 in the present invention can reduce the impact of the liquid on the bottom end of the equipment main body 1 and extend the service life of the equipment main body 1; moreover, it can also control the redistribution of the liquid velocity to achieve the purpose of uniform distribution of the overflow liquid of the thickener and uniform distribution of the flow velocity.

[0036] Figures 3a - 3d Schematically show four grid-like structures of the grid plate 5 of the present invention respectively. As Figures 3a - 3d shown, the grid-like structure can include: rectangular grids in a cross-cross form, rectangular grids in a staggered brick wall form, triangular grids, and parallelogram grids, etc.

[0037] AsFigure 4 A top view of the grid plate 5 in a cross-shaped rectangular grid structure is schematically shown. As Figure 4 shown, the grid plate 5 in the present invention preferably adopts a cross-shaped rectangular grid structure formed by inserting multiple flat plates. This structure can better ensure the uniform distribution of the overflow liquid of the thickener and the uniformity of the flow rate of the overflow liquid of the thickener, thereby improving the filtering effect.

[0038] The operation process of the particle continuous filtration device of the present invention is described as follows:

[0039] The overflow liquid of the thickener containing suspended matter enters the equipment main body 1 below the particle filtration layer 4 through a pump from the liquid inlet pipe 2; the liquid continues to flow downward, flows through the grid plate 5 to the bottom of the equipment, and then flows upward in the reverse direction, passing through the grid plate 5 again. (During the flowing process, it passes through the grid plate 5 twice successively, so as to effectively control the impact of the liquid on the bottom end of the equipment main body 1 and the redistribution of the liquid velocity); it flows upward to the bottom of the particle filtration layer 4, and then passes through the particle filtration layer 4 for filtration (that is, from the bottom to the top), and after filtration, it overflows from the overflow port 3 through the overflow pipe 31; thus, effective fine filtration of the pre-extraction liquid is achieved, the concentration of suspended matter in the overflow liquid of the thickener is reduced, making it meet the water inlet requirements of the thickener, and this device can continuously filter for a long time.

[0040] After testing, when the feeding speed is 7.6m 3 / m 2 ·h and the feeding concentration is 100 ppm, after being filtered by the particle continuous filtration device of the present invention, the effluent concentration can reach below 10 ppm. Moreover, the particle continuous filtration device of the present invention can continuously operate for 34 hours at a time; during backwashing, it can be directly washed from above the particle filtration layer 4, and when necessary, the device can also operate without interruption.

[0041] Figure 5a 、 5c Figures 5d schematically show the simulation model of the particle filtration device of the present invention and the simulation results of fluid flow. For comparison, Figure 5b schematically shows the simulation results of fluid flow inside the device without adding the grid plate. In the present invention, the concept of simulation design runs through the entire equipment design process: a simulation model of the particle continuous filtration device is established, as Figure 5a shown; the fluid flow (velocity field) conditions of the grid plate 5, the particle filtration layer 4 and the design of each structural dimension in the particle continuous filtration device involved in the present invention are analyzed, as Figure 5c and Figure 5dAs shown, it intuitively reflects and verifies the flow effect of the particle continuous filtration device involved in the present invention. When this device is used for the fine filtration of the pre-extraction liquid under a certain working condition, the flow uniformity effect under its design is verified through simulation calculation. The flow simulation results show that the design of this new particle continuous filtration device has the following flow characteristics:

[0042] I. Through the analysis of the fluid flow (velocity field) of this particle continuous filtration device, it shows that after the overflow liquid of the thickener containing suspended matter enters the equipment main body 1 from the liquid inlet pipe 2 through a pump, it flows downward to the bottom end of the equipment main body 1 and then flows upward in the reverse direction. During the flow process, it passes through the grid plate 5 twice successively. The setting of the grid plate 5 can control the impact of the liquid on the bottom end of the equipment and the redistribution of the liquid velocity.

[0043] II. By using the particle continuous filtration device of the present invention, the overflow liquid of the thickener containing suspended matter flows in the equipment main body 1, and the velocity distribution of the entire cross-section can reach a relatively uniform state before passing through the particle filtration layer 4, inside the particle filtration layer 4, and outside the top end of the particle filtration layer 4.

[0044] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. The present invention includes all modifications, equivalents, or replacements within the spirit and technical scope of the present invention.

Claims

1. A continuous particle filtration device for fine filtration of the pre - extraction liquid in the hydrometallurgical copper extraction process, characterized in that, Including: a device main body, a particle filter layer and a grid plate which are sequentially arranged inside the device main body from top to bottom, and a liquid inlet pipe; wherein, The outer peripheral surface of the particle filter layer is fixedly attached to the inner wall of the device main body; the particle filter layer is used to filter the suspended substances in the overflow liquid of the thickener, with a thickness of 300 - 500 mm and a particle size of 0.8 - 4 mm; The outer peripheral surface of the grid plate is fixedly attached to the inner wall of the device main body; there are multiple grid plates, and they are arranged in parallel at intervals along the vertical direction of the device main body; the thickness of the grid plate is 40 - 80 mm, and the distance between adjacent two grid plates is 180 - 220 mm; the grid plate is a grid-like structure; The liquid inlet pipe is inserted into the device main body from the top of the device main body, and the end of the liquid inlet pipe extends out of the particle filter layer and is located above the grid plate; the distance between the end of the liquid inlet pipe and the grid plate is 200 - 2500 mm; An overflow port is arranged on the upper side wall of the device main body, and the overflow port is located above the particle filter layer; Wherein, the overflow liquid of the thickener containing suspended substances is directly sent to the lower part of the particle filter layer through the liquid inlet pipe, flows to the grid plate, then flows downward to the bottom end of the device main body and then flows upward reversely, passes through the grid plate again and reaches the bottom of the particle filter layer, and then is filtered through the particle filter layer and overflows from the overflow port.

2. The continuous particle filtration device according to claim 1, wherein The thickness of the particle filter layer is 400 mm; the particle size in the particle filter layer is 1 mm.

3. The continuous particle filtration device according to claim 1, wherein, It further includes: A fixing member fixedly arranged on the inner wall of the device main body for fixing the liquid inlet pipe, and the fixing member is located between the particle filter layer and the grid plate.

4. The continuous particle filtration device according to claim 1, characterized in that, The grid-like structure includes: one of a triangular lattice and a parallelogram lattice.

5. The continuous particle filtration device according to claim 1, wherein, The grid plate is a cross-shaped rectangular grid-like structure formed by inserting multiple flat plates.

6. The continuous particle filtration device according to claim 4, wherein, The distance between the end of the liquid inlet pipe and the particle filter layer is 200 - 1000 mm.

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