Hydrocyclone for solid removal of in-situ leaching uranium mining leachate and use method of hydrocyclone

Abstract

The invention provides a hydrocyclone for solid removal of in-situ leaching uranium mining leachate and a use method of the hydrocyclone, and relates to the technical field of in-situ leaching uranium mining, the hydrocyclone comprises a main body part, and the main body part comprises a separation cylinder and a separation cone; the inlet pipe is tangent to the side surface of one end, far away from the separation cone, of the separation barrel; the annular baffle is arranged in the separation barrel; the overflow pipe is fixedly connected with the separation barrel through the hole in one end of the separation barrel, and an overflow silk screen is arranged at the end, close to the separation barrel, of the overflow pipe. According to the invention, the annular baffle is additionally arranged in the hydrocyclone to form the cyclone generating cavity, so that a flow channel is reduced after in-situ leaching uranium mining leachate enters the separation barrel from the inlet pipe, the fluid cyclone strength is improved, and the phenomenon of'short-circuit flow 'of particles is effectively avoided; in addition, the overflow pipe is provided with the overflow screen mesh, so that the effect of secondary particle trapping is achieved when the clear liquid overflows, and the treatment efficiency of the hydrocyclone is improved.

Description

Technical Field

[0001] The invention relates to the technical field of in-situ uranium leaching, and in particular to a hydraulic cyclone for desolidification of uranium leaching solution in in-situ leaching and a use method thereof. Background Art

[0002] In-situ leaching of uranium is a uranium mining process that uses chemical solutions to selectively leach and recover uranium metal from natural burial conditions through drilling engineering. Affected by multiple factors such as underground rocks and minerals, flow fields, drilling structures, and process conditions, the leachate will be lifted to the surface along with solid impurities such as clay and mud. In order to ensure the normal progress of the hydrometallurgical process, the solid particles in the leachate must first be removed by liquid phase desolidification. If the solid particles are not removed completely, on the one hand, it will have an adverse effect on subsequent hydrometallurgical processes such as adsorption and elution, such as causing the resin balls in the adsorption tower to adhere to mud and sand, reducing the contact area with the leachate; on the other hand, the particles are also very easy to follow the tailings into the drill and ore layer again, causing the ore-bearing layer to be blocked, reducing the system's pumping and injection volume, and greatly affecting the mine's production capacity. Summary of the invention

[0003] The object of the present invention is to provide a hydrocyclone for desolidification of uranium leaching solution in situ leaching and a method for using the same to improve the above-mentioned problems. In order to achieve the above-mentioned object, the technical solution adopted by the present invention is as follows:

[0004] In a first aspect, the present application provides a hydrocyclone for desolidification of uranium leaching solution in situ leaching, comprising:

[0005] The main body part includes a separation cylinder and a separation cone, wherein the separation cylinder is a hollow cylinder, and the separation cone is a cone without a bottom circle and an open cone bottom end, wherein one end of the separation cylinder is fixedly connected to the circular bottom surface of the separation cone, and the other end of the separation cylinder is fixedly connected to a circular plate with a circular hole in the center;

[0006] an inlet pipe, wherein the inlet pipe is tangent to a side surface of the separation cylinder away from the separation cone;

[0007] An annular baffle, which is a hollow cylinder, is arranged inside the separation cylinder, and the central axis of the annular baffle coincides with the central axis of the separation cylinder;

[0008] And an overflow pipe, the overflow pipe is fixedly connected to the separation cylinder through a hole at one end of the separation cylinder, an overflow screen is arranged at one end of the overflow pipe close to the separation cylinder, the overflow screen is in an inverted cone shape, and the conical bottom end of the overflow screen is not closed.

[0009] Furthermore, the hydrocyclone also includes an underflow sand storage box, a push-pull plate and a sand discharge pipe.

[0010] The underflow sand storage box is a hollow cuboid, the conical bottom end of the separation cone is fixedly connected to one side of the underflow sand storage box, and a window is provided on the other side of the underflow sand storage box;

[0011] A sand discharge pipe is arranged at one end of the underflow sand storage box, a pull rod passing through the end surface is arranged at the other end of the underflow sand storage box, and a vertical plate is arranged at one end of the pull rod located inside the underflow sand storage box.

[0012] Furthermore, the hydrocyclone also includes a backwash pipe;

[0013] The backwash pipe is arranged on the overflow pipe.

[0014] Furthermore, the hydrocyclone includes a first input pipeline, a second input pipeline, a first output pipeline and a second output pipeline, the first input pipeline is sequentially provided with an inlet pressure gauge, a flow meter and an inlet cyclone valve, and the first input pipeline is connected to the inlet pipe at one end close to the inlet pressure gauge.

[0015] Furthermore, an underflow valve is provided on the first output pipeline, one end of the first output pipeline is connected to the sand discharge pipe, and the other end of the first output pipeline is connected to the natural sedimentation tank;

[0016] The second input pipeline is provided with a recoil valve, a post-pump valve, a pipeline pump and a pre-pump valve in sequence, one end of the second input pipeline close to the recoil valve is connected to the recoil pipe, and one end of the second input pipeline close to the pre-pump valve is connected to the natural sedimentation tank;

[0017] The second output pipeline is provided with an overflow pressure gauge, an overflow valve and a check valve in sequence, and one end of the second input pipeline close to the overflow pressure gauge is connected to the overflow pipe;

[0018] One end of the second output pipe close to the check valve is connected to one end of the backflush valve close to the pump rear valve through a filter valve;

[0019] One end of the second output pipeline close to the check valve is communicated with one end of the cyclone inlet valve away from the flow meter through a bypass valve.

[0020] In a second aspect, the present application also provides a method for using a hydrocyclone to remove solids from in-situ leaching uranium leaching solution, comprising:

[0021] Setting all valves to a first switch state, collecting the inlet pressure of the in-situ leaching uranium leaching solution based on the inlet pressure gauge to obtain a first pressure value, wherein the first switch state includes closing a bypass valve, an underflow valve, a backwash valve, a pre-pump valve, a post-pump valve and a filter valve, and opening a cyclone inlet valve and an overflow valve;

[0022] Collecting overflow pressure based on the overflow pressure gauge to obtain a second pressure value;

[0023] When the sand level in the underflow sand storage box reaches the set full sand height, the underflow valve is opened and the sand is discharged through the pull rod;

[0024] When the solid-liquid separation in the natural sedimentation tank is completed, the valve before the pump, the valve after the pump and the filter valve are opened to output the in situ leaching uranium leachate after desolidification;

[0025] Calculating a change degree value of the second pressure value within a preset time period based on the first pressure value and the second pressure value;

[0026] The flushing pressure and flushing duration are determined based on the change degree value and the pressure ratio, and the overflow screen is periodically flushed based on the flushing pressure and the flushing duration. The pressure ratio is the ratio of the first pressure value to the second pressure value.

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

[0028] The present invention forms a vortex-making cavity by adding an annular baffle inside the hydrocyclone, so that the flow path of the in-situ leaching uranium leaching solution is reduced after entering the separation cylinder from the inlet pipe, thereby improving the fluid vortex intensity and effectively avoiding the particle "short-circuit flow" phenomenon; and also realizes the effect of secondary particle capture when the clear liquid overflows by arranging an overflow screen on the overflow pipe, thereby improving the processing efficiency of the hydrocyclone.

[0029] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or be understood by implementing the embodiments of the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a schematic diagram of the overall system of a hydrocyclone for desolidification of uranium leaching solution in in situ leaching according to an embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of the structure of a hydrocyclone for desolidification of uranium leaching solution in in situ leaching according to an embodiment of the present invention;

[0033] Figure 3 It is a schematic flow chart of a method for using a hydrocyclone to remove solids from in-situ leaching uranium leaching solution according to an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the structural dimensions of a hydrocyclone actually used in a uranium leaching mine in a certain location in the Inner Mongolia Autonomous Region described in the embodiments of the present application.

[0035] Markings in the figure:

[0036] 1. Inlet pipe; 2. Separation cylinder; 3. Annular baffle; 4. Separation cone; 5. Overflow screen; 6. Overflow pipe; 7. Underflow sand storage box; 8. Pull rod; 9. Window; 10. Sand discharge pipe; 11. Backwash pipe; 12. First input pipeline; 13. Inlet pressure gauge; 14. Flow meter; 15. Cyclone inlet valve; 16. First output pipeline; 17. Underflow valve; 18. Natural sedimentation tank; 19. Second input pipeline; 20. Backwash valve; 21. Valve after pump; 22. Pipeline pump; 23. Valve before pump; 24. Second output pipeline; 25. Overflow pressure gauge; 26. Overflow valve; 27. Check valve; 28. Filter valve; 29. ​​Bypass valve. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0039] Embodiment 1:

[0040] This embodiment provides a hydrocyclone for desolidification of uranium leaching solution in situ leaching. Figure 1 .

[0041] The main body part includes a separation cylinder 2 and a separation cone 4. The separation cylinder 2 is a hollow cylinder, and the separation cone 4 is a cone without a bottom circle and an open cone bottom. One end of the separation cylinder 2 is fixedly connected to the circular bottom surface of the separation cone 4, and the other end of the separation cylinder 2 is fixedly connected to a circular plate with a circular hole in the center.

[0042] An inlet pipe 1, which is tangent to the side surface of the separation cylinder 2 away from the separation cone 4;

[0043] The annular baffle 3 is a hollow cylinder, and the annular baffle 3 is arranged inside the separation cylinder 2, and the central axis of the annular baffle 3 coincides with the central axis of the separation cylinder 2;

[0044] and an overflow pipe 6, the overflow pipe 6 is fixedly connected to the separation cylinder 2 through a hole at one end of the separation cylinder 2, an overflow screen 5 is arranged at one end of the overflow pipe 6 close to the separation cylinder 2, the overflow screen 5 is in an inverted cone shape, and the conical bottom end of the overflow screen 5 is not closed;

[0045] In the present application embodiment, Figure 2 As shown, the inlet pipe 1 is tangent to the separation cylinder 2, and the tangent position is at the uppermost end of the separation cylinder 2. The inlet pipe 1 is in the shape of a round tube or a rectangular tube; the separation cylinder 2 is cylindrical, the bottom end of the cylinder is not closed, the upper end of the cylinder is closed but an outward interface is left at the center, and a flange can be attached for connection with the overflow pipe 6. The height-to-diameter ratio of the separation cylinder 2 is usually in the range of 1.05 to 2.85. Considering that the pH value of the uranium leaching solution in situ leaching is about 2 or 7, in order to prevent rust inside the equipment, the separation cylinder 2 can be made of 316 or 316L stainless steel, or carbon steel. If the separation cylinder 2 is made of carbon steel, a layer of polyolefin material needs to be lined on the inner wall of the separation cylinder 2.

[0046] The thickness of the annular baffle 3 is 1.5 to 2.5 mm, and the material is 316 or 316L stainless steel. The vortex-forming chamber formed by the annular baffle 3 and the separation cylinder 2 remains concentric with the separation cylinder 2. The upper end of the annular baffle 3 is fixed to the separation cylinder 2 by welding. The length and height of the vortex-forming chamber are consistent with the length and height of the separation cylinder 2, and the radius of the vortex-forming chamber is 0.25 to 0.75 times the radius of the separation cylinder 2.

[0047] The separation cone 4 is wide at the top and narrow at the bottom, and is hollow inside. It is made of the same material as the separation cylinder 2. The upper end diameter of the separation cone 4 is consistent with the separation cylinder 2, and they are connected by welding. The lower end diameter of the separation cone 4 is 0.2 to 0.6 times the upper end diameter, and the vertical distance between the upper end center and the lower end center of the separation cone 4 is 1 to 2 times the upper end diameter.

[0048] The overflow wire mesh 5 is in an inverted cone shape, and its diameter is equal to that of the overflow pipe 6 . The height-to-diameter ratio of the overflow wire 5 is 1.5-3.0, and the mesh diameter of the overflow wire 5 is 30-75 μm.

[0049] The working principle of the hydrocyclone is as follows: a cyclone cavity is formed between the annular baffle 3 and the separation cylinder 2. After the in-situ leaching uranium leaching solution enters the separation cylinder 2 tangentially from the inlet pipe 1, it is affected by the constraint force of the cylinder wall and generates centrifugal force inside the hydrocyclone. Under the dual action of centrifugal force and gravity, the solid phase with a large specific gravity is thrown to the side wall of the separation cylinder 2, and then flows downward and is temporarily stored in the bottom flow sand storage box 7, and finally discharged from the sand discharge pipe 10. The liquid phase with a small specific gravity and a small amount of particulate matter is in the center of the hydrocyclone, and rotates upward to flow out from the overflow pipe 6, so as to achieve the purpose of desolidification of the in-situ leaching uranium leaching solution.

[0050] The hydrocyclone further includes an underflow sand storage box 7, a push-pull plate and a sand discharge pipe 10. The underflow sand storage box 7 is a hollow rectangular parallelepiped. The conical bottom end of the separation cone 4 is fixedly connected to one side of the underflow sand storage box 7. A window 9 is provided on the other side of the underflow sand storage box 7. A sand discharge pipe 10 is provided at one end of the underflow sand storage box 7. A pull rod 8 passing through the end face is provided at the other end of the underflow sand storage box 7. A vertical plate is provided at one end of the pull rod 8 located inside the underflow sand storage box 7.

[0051] In the present application embodiment, Figure 1 As shown, the bottom flow sand storage box 7 is a rectangular hollow structure, the top opening is welded to the bottom end of the separation cone 4, the right end is a sand discharge pipe 10 which is opened and closed by a valve, a pull rod 8 is arranged at the left end, and the right end of the pull rod 8 is connected to a flat plate, the area of ​​which is slightly smaller than the cross-sectional area of ​​the bottom flow sand storage box 7. When sand needs to be discharged, the pull rod 8 can be pushed to push the sand to the right side of the sand discharge pipe 10 with the help of the flat plate.

[0052] Normally, the length of the underflow sand storage box 7 is equal to the diameter of the separation cylinder 2, and the width and height are equal to 0.3 to 0.5 times the length of the underflow sand storage box 7. A visual window 9 is installed on the front of the underflow sand storage box 7. The material is organic glass. The amount of stored sand can be judged through the visual window 9. The length of the visual window 9 is equal to the diameter of the bottom end of the separation cone 4, and the height of the visual window 9 is equal to 0.4 to 0.8 times the length.

[0053] An underflow valve 17 is installed on the sand discharge pipe 10, and a natural sedimentation tank 18 is connected after the underflow valve 17. Since a small amount of leachate is inevitably discharged when the sand is discharged, and the leachate contains uranium and cannot be discharged, it is temporarily stored in the natural sedimentation tank 18. After natural sedimentation, the upper clear liquid is pumped into the overflow pipe 6 to merge with the overflow clear liquid, and the bottom sand is placed in the solid waste storage. At the same time, the upper clear liquid is also used as a recoil liquid.

[0054] The hydrocyclone further comprises a backwash pipe 11 , which is arranged on the overflow pipe 6 .

[0055] The hydrocyclone comprises a first input pipeline 12, a second input pipeline 19, a first output pipeline 16 and a second output pipeline 24. The first input pipeline 12 is provided with an inlet pressure gauge 13, a flow meter 14 and a hydrocyclone inlet valve 15 in sequence. One end of the first input pipeline 12 close to the inlet pressure gauge 13 is connected to the inlet pipe 1.

[0056] An underflow valve 17 is provided on the first output pipeline 16, one end of the first output pipeline 16 is connected to the sand discharge pipe 10, and the other end of the first output pipeline 16 is connected to the natural sedimentation tank 18;

[0057] The second input pipeline 19 is provided with a backflush valve 20, a post-pump valve 21, a pipeline pump 22 and a pre-pump valve 23 in sequence, and one end of the second input pipeline 19 close to the backflush valve 20 is connected to the backflush pipe 11, and one end of the second input pipeline 19 close to the pre-pump valve 23 is connected to the natural sedimentation tank 18; the second output pipeline 24 is provided with an overflow pressure gauge 25, an overflow valve 26 and a check valve 27 in sequence, and one end of the second input pipeline 19 close to the overflow pressure gauge 25 is connected to the overflow pipe 6; one end of the second output pipeline 24 close to the check valve 27 is connected to one end of the backflush valve 20 close to the post-pump valve 21 through a filter valve 28; one end of the second output pipeline 24 close to the check valve 27 is connected to one end of the cyclone inlet valve 15 away from the flowmeter 14 through a bypass valve 29;

[0058] In the embodiment of the present application, the first input pipe 12 is used as the input pipe of the in situ leaching uranium leachate; the second input pipe 19 is used as the recoil pipe 11, and the upper clear liquid in the natural sedimentation tank 18 is used as the recoil liquid to clean the adsorbed particles on the overflow screen 5; the first output pipe 16 is used as the output pipe of the bottom flow sand storage box 7; the second output pipe 24 is the output pipe of the overflow liquid of the overflow pipe 6.

[0059] Embodiment 2:

[0060] This embodiment provides a method for using a hydrocyclone for desolidification of uranium leaching solution in in-situ leaching.

[0061] See also Figure 3 , the figure shows that the method includes step S10, step S20, step S30, step S40, step S50 and step S60:

[0062] Step S10. All valves are set to a first switch state, and the inlet pressure of the in-situ leaching uranium leaching solution is collected based on the inlet pressure gauge 13 to obtain a first pressure value. The first switch state includes closing the bypass valve 29, the underflow valve 17, the backwash valve 20, the pre-pump valve 23, the post-pump valve 21 and the filter valve 28, and opening the cyclone inlet valve 15 and the overflow valve 26;

[0063] Step S20. Collecting the overflow pressure based on the overflow pressure gauge 25 to obtain a second pressure value;

[0064] Step S30. When the sand level in the underflow sand storage box 7 reaches the set full sand height, the underflow valve 17 is opened, and the sand is discharged through the pull rod 8;

[0065] Specifically, during actual use, it can be determined whether to use the pull rod 8 to perform the sand discharge operation according to the sand discharge situation of the underflow sand storage box 7.

[0066] Step S40. After the solid-liquid separation in the natural sedimentation tank 18 is completed, the valve before the pump 23, the valve after the pump 21 and the filter valve 28 are opened to output the desolidified uranium in situ leaching solution;

[0067] Step S50. Calculate the change degree of the second pressure value within a preset time period based on the first pressure value and the second pressure value;

[0068] Specifically, considering that the overflow screen 5 may be blocked by clay or silt solid phase after working for a period of time, resulting in reduced liquid discharge capacity and increased equipment pressure, the present application also provides a backwash pipe 11 to backwash the overflow screen 5 using the upper clear liquid in the natural sedimentation tank 18.

[0069] Specifically, step S50 specifically includes step S51, step S52, step S53, step S54, step S55 and step S56:

[0070] Step S51. Calculate the difference between the second pressure value and the corresponding first pressure value at each time point in the preset time period to obtain a plurality of first values;

[0071] Step S52. Calculate the absolute value function value of each first value to obtain multiple second values;

[0072] Step S53. Calculate the opposite of each second value to obtain a plurality of third values;

[0073] Step S54. Calculate the exponential function value with the natural constant as the base and the third value as the variable to obtain a plurality of fourth values;

[0074] Step S55. Sum multiple fourth values ​​to obtain a fifth value;

[0075] Step S56. Calculate the ratio of the fifth value to the number of time points in the preset time period to obtain a change degree value;

[0076] Specifically, considering that the blockage conditions of the overflow screen 5 are different, the flushing pressure and flushing time adopted are different. The blockage condition of the overflow screen 5 can be evaluated by the pressure change degree value collected on the overflow pressure gauge 25. The corresponding calculation formula is:

[0077]

[0078] Wherein, H is the change degree value of the second pressure value within the preset time period; is the pressure value collected by the overflow pressure gauge 25 at the i-th time point within the preset time period; is the pressure value collected by the inlet pressure gauge 13 at the i-th time point within the preset time period; abs( ) is the absolute value function; and N is the number of time points within the preset time period.

[0079] Step S60. Determine the flushing pressure and flushing duration based on the change degree value and the pressure ratio, and periodically flush the overflow screen 5 based on the flushing pressure and the flushing duration, the pressure ratio being the ratio of the first pressure value to the second pressure value;

[0080] Specifically, by collecting the pressure change value on the pressure gauge 25 within a preset time period, the flushing time and flushing pressure required for the current overflow screen 5 can be determined more accurately, which can effectively avoid incomplete flushing due to insufficient flushing pressure or insufficient flushing time, or waste of flushing resources due to excessive flushing pressure or excessive flushing time.

[0081] Specifically, step S60 specifically includes step S61, step S62, step S63, step S64, step S65 and step S66:

[0082] Step S61. Construct a curve graph with time as the horizontal axis and pressure ratio as the vertical axis within a preset time period;

[0083] Step S62: Determine the target slope based on the pressure ratio and time corresponding to the initial time point and the final time point in the curve graph;

[0084] Step S63. Obtain the flushing duration before the preset time period as the historical flushing duration;

[0085] Step S64. Determine the flushing pressure based on the change degree value and the target slope;

[0086] Specifically, considering that the first pressure value usually changes in a small amplitude, while the second pressure value changes in a large amplitude due to the blockage of the overflow screen 5, and usually gradually increases within a certain period of time, the present application considers the ratio of the first pressure value to the second pressure value, and constructs an image based on this. The ratio usually decreases gradually, and the slope of the corresponding image will gradually slow down.

[0087] Specifically, step S64 specifically includes step S641, step S642, step S643 and step S644:

[0088] Step S641. Calculate the difference between the set threshold and the change degree value to obtain a sixth value;

[0089] Step S642. Calculate the opposite of the target slope to obtain a seventh value;

[0090] Step S643. Calculate the exponential function value with the natural constant as the base and the seventh value as the variable to obtain the eighth value;

[0091] Step S644. Calculate the product of the sixth value and the eighth value to obtain the flushing pressure;

[0092] Specifically, the flushing pressure calculation formula is:

[0093] P C =e (-k) *(1-H)

[0094] Among them, P C is the flushing pressure; k is the target slope; H is the degree of change.

[0095] Step S65. Determine the flushing duration based on the target slope and the historical flushing duration;

[0096] Specifically, step S65 specifically includes step S651, step S652 and step S653:

[0097] Step S651. Calculate the product of the target slope and the historical flushing time to obtain a ninth value;

[0098] Step S652. Calculate the product of the ninth value and the adjustment parameter to obtain the adjustment duration, where the positive and negative values ​​of the adjustment parameter are the same as those of the target slope;

[0099] Step S653. Calculate the sum of the historical flushing duration and the adjustment duration to obtain the flushing duration;

[0100] Specifically, the flushing time calculation formula is:

[0101] T C =T L +μ*T L *k

[0102] Among them, T C is the flushing time; T L is the historical flushing time; μ is the adjustment parameter; k is the target slope.

[0103] Step S66. Set all valves to the second switch state, and start the pipeline pump 22 to backwash the overflow screen 5 based on the flushing pressure and flushing time. The second switch state includes closing the filter valve 28, the cyclone inlet valve 15 and the overflow valve 26, and opening the bypass valve 29, the underflow valve 17, the backwash valve 20, the pump front valve 23 and the pump rear valve 21;

[0104] Specifically, under normal circumstances, the preset time period is usually one week, and the corresponding flushing time and flushing pressure will be obtained after each week. After backwashing, pressure monitoring and collection will be carried out within the next preset time period.

[0105] The hydrocyclone according to the present application was installed and applied on site in a uranium leaching mine in Inner Mongolia Autonomous Region. Figure 4 As shown, the inlet flow rate of uranium leaching solution is Q = 22m 3 / h, that is, the incident speed is 1.84m / s.

[0106] The particle size distribution of the hydrocyclone inlet pipe 1 and the overflow pipe 6 was analyzed by a laser particle size analyzer (model: Dandong Better BT-9300S), as shown in Table 1. As can be seen from Table 1, the hydrocyclone of the present application can achieve 99.9% separation for particles with a particle size range of >50 μm, and complete separation for particles with a particle size range of >60 μm.

[0107] Table 1 Particle distribution of hydrocyclone inlet and outlet

[0108]

[0109] To further calculate the overall separation efficiency of the hydrocyclone, the calculation process is as follows:

[0110] First, the particle concentration of the in-situ leaching uranium leaching solution in the hydrocyclone inlet pipe 1 was measured by a portable suspended solids meter (model: LH-SS2M) to be 18.35 mg / L, and the particle concentration of the clear solution in the overflow pipe 6 was 2.08 mg / L. In view of the fact that the bottom flow port of the hydrocyclone is normally closed in actual operation, the discharge flow rate of the overflow pipe 6 is equal to the feed flow rate. Based on this, the overall separation efficiency of the hydrocyclone can be obtained as:

[0111]

[0112] Among them, w outlet-overflow is the particle concentration of the clear solution; w inlet is the particle concentration of the uranium in situ leaching solution; η is the overall separation efficiency.

[0113] The separation efficiency for particles of 5 to 50 μm is further calculated as follows:

[0114] Assuming that the particles of the in-situ leaching uranium leachate in the hydrocyclone inlet pipe 1 are N, according to Table 1, the 5-50μm particles at the inlet pipe 1 account for 43.79%, so the number of 5-50μm particles at the inlet pipe 1 is 0.4379N; since the overall separation efficiency is 88.66%, the number of particles at the overflow pipe 6 is 0.1134N; and since the 5-50μm particles at the overflow pipe 6 account for 56.57%, the number of 5-50μm particles at the overflow pipe 6 is 0.0642N. Based on this, the separation efficiency of the hydrocyclone for 5-50μm particles is:

[0115]

[0116] Among them, w in is the number of particles with a size of 5 to 50 μm at the inlet pipe 1; w out2 is the expected number of particles with a size of 5 to 50 μm at the overflow pipe 6; w out1 is the actual number of particles with a size of 5 to 50 μm at the overflow pipe 6; η (5～50) It is the separation efficiency of the hydrocyclone for particles of 5 to 50 μm.

[0117] It can be seen that the patent of the present invention can achieve a separation of more than 85% of particles of 5 to 50 μm and 100% of particles larger than 60 μm.

[0118] The replacement frequency of the filter bag (precision: 50 μm) of the subsequent bag filter of the hydrocyclone was further investigated. After using the method of the present application, the replacement frequency of the filter bag was changed from 3 times every 7 days to once every 7 days.

[0119] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0120] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A hydrocyclone for desolidification of uranium in-situ leaching solution, characterized in that: include: A main body part, the main body part comprising a separation cylinder (2) and a separation cone (4), the separation cylinder (2) being a hollow cylinder, the separation cone (4) being a cone without a bottom circle and with an open conical bottom end, one end of the separation cylinder (2) being fixedly connected to the circular bottom surface of the separation cone (4), and the other end of the separation cylinder (2) being fixedly connected to a circular plate with a circular hole in the center; an inlet pipe (1), the inlet pipe (1) being tangent to a side surface of the separation cylinder (2) at an end away from the separation cone (4); an annular baffle (3), the annular baffle (3) being a hollow cylinder, the annular baffle (3) being arranged inside the separation cylinder (2), the central axis of the annular baffle (3) being coincident with the central axis of the separation cylinder (2); and an overflow pipe (6), wherein the overflow pipe (6) is fixedly connected to the separation cylinder (2) through a hole at one end of the separation cylinder (2), and an overflow screen (5) is provided at one end of the overflow pipe (6) close to the separation cylinder (2), wherein the overflow screen (5) is in an inverted cone shape, and the conical bottom end of the overflow screen (5) is not closed.

2. The hydrocyclone for desolidification of uranium in situ leaching solution according to claim 1, characterized in that The hydrocyclone further comprises an underflow sand storage box (7), a push-pull plate and a sand discharge pipe (10). The underflow sand storage box (7) is a hollow rectangular parallelepiped, the conical bottom end of the separation cone (4) is fixedly connected to one side of the underflow sand storage box (7), and a window (9) is provided on the other side of the underflow sand storage box (7); A sand discharge pipe (10) is provided at one end of the underflow sand storage box (7), a pull rod (8) passing through the end surface is provided at the other end of the underflow sand storage box (7), and a vertical flat plate is provided at one end of the pull rod (8) located inside the underflow sand storage box (7).

3. The hydrocyclone for desolidification of uranium in situ leaching solution according to claim 2, characterized in that , the hydrocyclone further comprises a backwash pipe (11); The backwash pipe (11) is arranged on the overflow pipe (6).

4. The hydrocyclone for desolidification of uranium in situ leaching solution according to claim 3, characterized in that The hydrocyclone comprises a first input pipeline (12), a second input pipeline (19), a first output pipeline (16) and a second output pipeline (24); an inlet pressure gauge (13), a flow meter (14) and a hydrocyclone inlet valve (15) are sequentially arranged on the first input pipeline (12); an end of the first input pipeline (12) close to the inlet pressure gauge (13) is connected to the inlet pipe (1).

5. The hydrocyclone for desolidification of uranium in situ leaching solution according to claim 4, characterized in that The first output pipe (16) is provided with an underflow valve (17), one end of the first output pipe (16) is connected to the sand discharge pipe (10), and the other end of the first output pipe (16) is connected to the natural sedimentation tank (18); The second input pipeline (19) is provided with a recoil valve (20), a post-pump valve (21), a pipeline pump (22) and a pre-pump valve (23) in sequence; an end of the second input pipeline (19) close to the recoil valve (20) is connected to the recoil pipe (11); and an end of the second input pipeline (19) close to the pre-pump valve (23) is connected to the natural sedimentation tank (18); The second output pipeline (24) is provided with an overflow pressure gauge (25), an overflow valve (26) and a check valve (27) in sequence, and one end of the second input pipeline (19) close to the overflow pressure gauge (25) is connected to the overflow pipe (6); One end of the second output pipe (24) close to the check valve (27) is connected to one end of the backflush valve (20) close to the post-pump valve (21) through a filter valve (28); One end of the second output pipe (24) close to the check valve (27) is communicated with one end of the cyclone inlet valve (15) away from the flow meter (14) through a bypass valve (29).

6. A method for using a hydrocyclone to remove solids from uranium in-situ leaching solution, characterized in that: include: All valves are set to a first switch state, and the inlet pressure of the in-situ leaching uranium leaching solution is collected based on the inlet pressure gauge (13) to obtain a first pressure value, wherein the first switch state includes closing the bypass valve (29), the underflow valve (17), the backwash valve (20), the front valve of the pump (23), the rear valve of the pump (21) and the filter valve (28), and opening the cyclone inlet valve (15) and the overflow valve (26); Collecting overflow pressure based on an overflow pressure gauge (25) to obtain a second pressure value; When the sand level in the underflow sand storage box (7) reaches a set full sand height, the underflow valve (17) is opened and the sand is discharged through the pull rod (8); When the solid-liquid separation in the natural sedimentation tank (18) is completed, the pump front valve (23), the pump rear valve (21) and the filter valve (28) are opened to output the desolidified uranium in situ leaching solution; Calculating a change degree value of the second pressure value within a preset time period based on the first pressure value and the second pressure value; The flushing pressure and flushing duration are determined based on the change degree value and the pressure ratio, and the overflow screen (5) is periodically flushed based on the flushing pressure and the flushing duration. The pressure ratio is the ratio of the first pressure value to the second pressure value.

7. The method for using a hydrocyclone for desolidification of uranium in situ leaching solution according to claim 6, characterized in that , calculating the change degree of the second pressure value within a preset time period based on the first pressure value and the second pressure value, including: Calculate the difference between the second pressure value and the corresponding first pressure value at each time point in the preset time period to obtain a plurality of first values; Calculate the absolute value function value of each first value to obtain a plurality of second values; Calculate the opposite of each second value to obtain a plurality of third values; Calculate an exponential function value with the natural constant as the base and the third value as the variable to obtain a plurality of fourth values; performing sum calculation on the plurality of fourth values ​​to obtain a fifth value; The ratio of the fifth value to the number of time points in the preset time period is calculated to obtain the change degree value.

8. The method for using a hydrocyclone for desolidification of uranium in situ leaching solution according to claim 6, characterized in that: The flushing pressure and flushing duration are determined based on the change degree value and the pressure ratio value, and the overflow screen (5) is periodically flushed based on the flushing pressure and the flushing duration, including: Constructing a curve graph with time as the horizontal axis and pressure ratio as the vertical axis within the preset time period; Determining a target slope based on a pressure ratio and time corresponding to an initial time point and a final time point in the curve graph; Obtaining the flushing duration before the preset time period as the historical flushing duration; determining the flushing pressure based on the change degree value and the target slope; determining the flushing duration based on the target slope and the historical flushing duration; All valves are set to a second switch state, and based on the flushing pressure and the flushing duration, a pipeline pump (22) is correspondingly turned on to backwash the overflow screen (5), wherein the second switch state includes closing the filter valve (28), the cyclone inlet valve (15) and the overflow valve (26), and opening the bypass valve (29), the underflow valve (17), the backwash valve (20), the pump front valve (23) and the pump rear valve (21).

9. The method for using a hydrocyclone for desolidification of uranium in situ leaching solution according to claim 8, characterized in that , determining the flushing pressure based on the change degree value and the target slope, comprising: Calculate the difference between the set threshold and the change degree value to obtain a sixth value; Calculating the inverse of the target slope to obtain a seventh value; Calculate an exponential function value with the natural constant as the base and the seventh value as the variable to obtain an eighth value; The product of the sixth value and the eighth value is calculated to obtain the flushing pressure.

10. The method for using a hydrocyclone for desolidification of uranium in situ leaching solution according to claim 8, characterized in that , determining the flushing duration based on the target slope and the historical flushing duration, comprising: Calculating the product of the target slope and the historical flushing time to obtain a ninth value; Calculating the product of the ninth value and the adjustment parameter to obtain the adjustment duration, wherein the positive and negative values ​​of the adjustment parameter are the same as those of the target slope; The sum of the historical flushing duration and the adjusted duration is calculated to obtain the flushing duration.

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