Potassium chloride preparation system
By setting up a decomposition solution pipeline and a stirring impeller in the crystallizer of the potassium chloride preparation system, the problem that the decomposition solution is difficult to fully contact with large particles of low-sodium halide is solved, and efficient potassium chloride recovery is achieved, improving the recovery rate and improving product quality.
Patent Information
- Application Number
- CN202421366274.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-14
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-06-14
AI Technical Summary
In the prior art, the recovery rate of potassium chloride is relatively low, mainly because the decomposition solution is difficult to fully contact with large particles of low-sodium halide that are not completely dissolved, resulting in low quality of crude potassium, which in turn dissolves potassium chloride during the washing process.
A potassium chloride preparation system was designed. By inserting a decomposition solution pipeline into the crystallizer body and setting the stirring impeller in the decomposition area, it ensures that the decomposition solution is in direct contact with large particles of low-sodium halide that are not completely dissolved, and dissolution is accelerated under stirring.
It effectively improves the recovery rate of potassium chloride, avoids the problem of potassium chloride dissolution caused by low crude potassium quality, and at the same time enhances the fusion of the decomposition solution and the mother liquor, avoids the K+ of the partial potassium chloride to liquid phase, and improves the recovery rate of potassium chloride by about 3.6%.
Smart Images
Figure CN222694033U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of potassium chloride preparation, in particular to a potassium chloride preparation system. Background Art
[0002] Chloride salt lakes mainly have sedimentary resources and brine resources. The raw material carnallite for producing potassium chloride is obtained by using the brine of the salt lake through the evaporation of the salt pan beach. The raw carnallite can be processed to produce potassium chloride. There are many processes for producing potassium chloride using carnallite ore, mainly including the "cold crystallization-positive flotation" process and the "reverse flotation-cold crystallization" process. Both of these potassium chloride production processes require the crystallization process of the crystallizer to improve the grade of the potassium chloride product. Therefore, the decomposition and crystallization process are the key control points for controlling the quality and output of potassium chloride products.
[0003] The process of decomposition and potassium chloride crystallization is as follows: low sodium carnallites begin to dissolve after entering the crystallizer, forming a supersaturated solution of potassium chloride, and causing potassium chloride to precipitate and crystallize from the solution. However, in order to obtain potassium chloride particles with a fine particle size, the dissolution rate of low sodium carnallites must not be too fast, otherwise the supersaturation of potassium chloride will be too high, resulting in a large amount of potassium chloride fine crystals. The method for reducing the dissolution rate of low sodium carnallites is to use a decomposition liquid composed of decomposition fresh water and overflow mother liquor from the crystallizer to perform cold decomposition and crystallization, and decompose and crystallize the low sodium carnallites under the action of a stirring impeller.
[0004] In the prior art, the inlet of the decomposition liquid pipeline is arranged at the top of the crystallizer. Since the decomposition area is relatively long, some large low-sodium carnallite particles that are not completely dissolved will settle at the bottom of the crystallizer. The decomposition liquid entering from the top of the crystallizer is difficult to fully contact with these large low-sodium carnallite particles that are not completely dissolved, so it is difficult to effectively decompose the large low-sodium carnallite particles in time, resulting in low quality of crude potassium. As a result, a large amount of washing liquid is required to dissolve and elute the crude potassium during the washing process, so that potassium chloride is also dissolved, resulting in a low recovery rate of potassium chloride. Utility Model Content
[0005] The main purpose of the utility model is to provide a potassium chloride preparation system to solve the problem of low potassium chloride recovery rate in the prior art.
[0006] In order to achieve the above-mentioned purpose, the utility model provides a potassium chloride preparation system, including a crystallizer, the crystallizer including: a crystallizer body, having a decomposition area, a crystallization area and a sedimentation area arranged in sequence from the inside to the outside; a stirring member, including a motor, a rotating shaft connected to the output shaft of the motor and a stirring impeller connected to the outer periphery of the rotating shaft, the motor is arranged in the crystallizer body, the rotating shaft is rotatably arranged in the crystallizer body, and the stirring impeller is located in the decomposition area; a decomposition liquid pipeline is penetrated in the crystallizer body along the radial direction of the crystallizer body, the outlet of the decomposition liquid pipeline is connected to the decomposition area, the inlet of the decomposition liquid pipeline is used to introduce the decomposition liquid, and the central axis of the decomposition liquid pipeline is at a distance L from the stirring impeller, 2m≤L≤5m.
[0007] Further, the distance L is equal to 3 m.
[0008] Furthermore, the crystallizer body also has an overflow area, which is located above the sedimentation area. The potassium chloride preparation system also includes: a fresh water storage tank for storing fresh water; a fine crystal tank connected to the overflow area, and the fine crystal tank is used to receive the overflow mother liquor in the overflow area; a decomposition liquid forming component, including a power pump, a first branch, a second branch and a main pipeline, the first branch is used to connect the fresh water storage tank and the inlet of the main pipeline, the second branch is used to connect the fine crystal tank and the inlet of the main pipeline, the outlet of the main pipeline is connected to the inlet of the power pump, and the outlet of the power pump is connected to the decomposition liquid pipeline.
[0009] Furthermore, the potassium chloride preparation system also includes: a low-sodium carnallites forming part, which is used to form low-sodium carnallites, wherein the outlet of the low-sodium carnallites forming part is connected to the decomposition area of the crystallizer body, and a detection component is provided at the outlet of the low-sodium carnallites forming part, which is used to detect the amount of low-sodium carnallites ore, and a first control valve is provided on the first branch; the detection component is control-connected to the first control valve, and the first control valve controls the flow of the first branch according to the amount of low-sodium carnallites ore detected by the detection component.
[0010] Furthermore, a second control valve is provided on the main pipeline, the second control valve is control-connected to the detection component, and the second control valve controls the flow of the main pipeline according to the amount of low-sodium carnallite ore detected by the detection component.
[0011] Furthermore, an underflow pipeline connected to the sedimentation area is provided at the bottom of the crystallizer body. The potassium chloride preparation system also includes a screening part, a first concentrating device and a tailing salt pool. The screening part is used to separate the ore pulp and large solid particles. The underflow pipeline is connected to the inlet of the screening part, the inlet of the first concentrating device is connected to the ore pulp outlet of the screening part, and the solid outlet of the screening part is connected to the tailing salt pool.
[0012] Furthermore, the potassium chloride preparation system also includes a crude potassium concentrate section, which includes a crude potassium vibration device, a crude potassium concentrator, a first dehalogenation device, a washing device, a solid-liquid separation device and a drying device that are sequentially connected, the drying device is connected to the solid outlet of the solid-liquid separation device, and the crude potassium vibration device is constructed to be connected to the outlet of the first concentrator.
[0013] Furthermore, the potassium chloride preparation system also includes an overflow recovery thickener, the inlet of the overflow recovery thickener is connected to the fine crystal tank, the bottom flow outlet of the overflow recovery thickener is connected to the first dehalogenation device, and the overflow outlet of the overflow recovery thickener is constructed to be connected to the tailing salt pool.
[0014] By applying the technical solution of the utility model, the rotating shaft can be rotated under the action of the motor, and the rotating shaft drives the stirring impeller to rotate, thereby stirring the solid low-sodium carnallite particles in the decomposition area, wherein the solid small-particle low-sodium carnallite can be dissolved, the solid large-particle low-sodium carnallite will be partially dissolved, and the solid large-particle low-sodium carnallite that is not completely dissolved will settle to the bottom of the decomposition area; in the utility model, the decomposition liquid pipeline is passed through the crystallizer body, and the distance between the decomposition liquid pipeline and the stirring impeller is 2m to 5m. In this way, on the one hand, compared with the prior art in which the decomposition liquid pipeline is set at the top of the crystallizer, which causes the solid large-particle low-sodium carnallite to be incompletely decomposed and settle to the bottom of the decomposition area, the utility model The decomposition liquid in the novel crystallizer can be directly introduced into the decomposition area to directly contact with the solid large-particle low-sodium carnallites that are not completely decomposed and precipitated in the upper layer, and under the stirring action of the stirring impeller, the decomposition liquid can fully contact with the solid large-particle low-sodium carnallites that are not completely dissolved, so as to accelerate the dissolution of the solid large-particle low-sodium carnallites, thereby effectively decomposing the solid large-particle low-sodium carnallites, so as to avoid the problem of potassium chloride being dissolved in the washing process due to the low quality of crude potassium, thereby improving the recovery rate of potassium chloride; on the other hand, the decomposition liquid can be better integrated with the mother liquor in the crystallizer body, so as to avoid the decomposition liquid from directly contacting with the solid small-particle low-sodium carnallites located in the upper layer, thereby avoiding the conversion of part of the potassium chloride into liquid K + , thereby solving the problem of low potassium chloride recovery rate in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:
[0016] Figure 1 A schematic structural diagram of an embodiment of a potassium chloride preparation system of the utility model is shown;
[0017] Figure 2 Shows Figure 1 Schematic diagram of the structure of the crystallizer.
[0018] The above drawings include the following reference numerals:
[0019] 1. Crystallizer; 2. Decomposition area; 3. Crystallization area; 4. Sedimentation area; 5. Decomposition liquid pipeline; 6. Motor; 7. Rotating shaft; 8. Agitating impeller; 9. Overflow area; 10. Crystallizer body; 11. Second concentration device; 12. Flotation device; 13. Third concentration device; 14. Second dehalogenation device; 16. Fresh water storage tank; 17. Fine crystal tank; 18. First branch; 19. Second branch; 20. Main pipeline; 21. Screening section; 22. First concentration device; 23. Crude potassium vibration device; 24. Crude potassium thickener; 25. First dehalogenation device; 26. Washing device; 27. Solid-liquid separation device; 28. Drying device; 29. Overflow recovery thickener; 30. Tailing salt pond. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail with reference to the following embodiments.
[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0022] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.
[0023] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.
[0024] like Figure 2As shown, the utility model provides a potassium chloride preparation system. The potassium chloride preparation system includes a crystallizer 1, which includes: a crystallizer body 10, having a decomposition area 2, a crystallization area 3 and a sedimentation area 4 arranged in sequence from the inside to the outside; a stirring member, including a motor 6, a rotating shaft 7 connected to the output shaft of the motor 6 and a stirring impeller 8 connected to the outer periphery of the rotating shaft 7, the motor 6 is arranged in the crystallizer body 10, the rotating shaft 7 is rotatably arranged in the crystallizer 1 body, and the stirring impeller 8 is located in the decomposition area 2; a decomposition liquid pipeline 5 is penetrated in the crystallizer 1 body along the radial direction of the crystallizer body 10, the outlet of the decomposition liquid pipeline 5 is connected to the decomposition area 2, the inlet of the decomposition liquid pipeline 5 is used to pass the decomposition liquid, and the central axis of the decomposition liquid pipeline 5 and the stirring impeller 8 have a distance L, 2m≤L≤5m.
[0025] In the above technical scheme, the rotating shaft 7 can be rotated under the action of the motor 6, and the rotating shaft 7 drives the stirring impeller 8 to rotate, thereby stirring the solid low-sodium carnallite particles in the decomposition area 2, wherein the solid small-particle low-sodium carnallite can be dissolved, the solid large-particle low-sodium carnallite will be partially dissolved, and the solid large-particle low-sodium carnallite that is not completely dissolved will settle to the bottom of the decomposition area 2; in the utility model, by passing the decomposition liquid pipeline 5 through the crystallizer body 10, and the distance between the decomposition liquid pipeline 5 and the stirring impeller 8 is 2m to 5m, so that, on the one hand, compared with the prior art in which the decomposition liquid pipeline is set at the top of the crystallizer, resulting in the solid large-particle low-sodium carnallite not being completely decomposed and settling to the bottom of the decomposition area 2, the present utility model The decomposition liquid in the novel crystallizer can be directly introduced into the decomposition area 2 to directly contact with the solid large particles of low-sodium carnallites that are not completely decomposed and precipitated in the upper layer, and under the stirring action of the stirring impeller 8, the decomposition liquid can fully contact with the solid large particles of low-sodium carnallites that are not completely dissolved, so as to accelerate the dissolution of the solid large particles of low-sodium carnallites, thereby effectively decomposing the solid large particles of low-sodium carnallites, so as to avoid the problem of potassium chloride being dissolved in the washing process due to the low quality of crude potassium, thereby improving the recovery rate of potassium chloride; on the other hand, the decomposition liquid can be better integrated with the mother liquor in the crystallizer body 10, so as to avoid the decomposition liquid from directly contacting with the solid small particles of low-sodium carnallites located in the upper layer, thereby avoiding the conversion of part of the potassium chloride into liquid K + , thereby solving the problem of low potassium chloride recovery rate in the prior art.
[0026] It should be noted that in the embodiment of the utility model, the content of MgCl2 in the decomposition liquid introduced is 17% to 24%, so that the solubility of low-sodium carnallite can be improved.
[0027] It should be noted that in the embodiment of the present invention, the direction of the central axis of the decomposition liquid pipeline 5 is Figure 2In the horizontal direction, the distance L refers to the distance between the central axis of the decomposition liquid pipeline 5 and the geometric center of the stirring impeller 8.
[0028] Specifically, in the embodiment of the present invention, the solid particles with a diameter greater than 2 mm are solid large-particle low-sodium carnallite, and the particles with a diameter less than 0.8 mm are solid small-particle low-sodium carnallite.
[0029] Specifically, in the embodiment of the present invention, the decomposition liquid dissolves the low-sodium carnallite to form the above-mentioned mother liquor.
[0030] Preferably, in an embodiment of the present invention, the distance L is equal to 3 m.
[0031] Through the above-mentioned arrangement, it is easier to match the decomposition liquid with the stirring impeller 8, so that the decomposition liquid can be more fully contacted with the solid large-particle low-sodium carnallites settled there, so that the solid large-particle low-sodium carnallites are accelerated to dissolve in the crystallizer 1, thereby effectively decomposing the solid large-particle low-sodium carnallites, so as to avoid the problem of potassium chloride being dissolved during the washing process due to the low quality of crude potassium, thereby improving the recovery rate of potassium chloride; on the other hand, the decomposition liquid can be fully mixed with the mother liquor in the crystallizer 1 under the action of the stirring impeller 8, so as to avoid the solid small-particle low-sodium carnallites located in the upper layer directly contacting the decomposition liquid, so that the residence time of the solid small-particle low-sodium carnallites in the crystallizer 1 can be increased, thereby avoiding the conversion of part of the potassium chloride into liquid K + This in turn increases the potassium chloride recovery rate by 3.6%.
[0032] In the prior art, generally, the fresh water in the fresh water storage tank 16 is first added to the larger fine crystal tank 17 through a pipeline, so that the fresh water and the overflow mother liquor in the fine crystal tank 17 are mixed to form a decomposition liquid, and then the decomposition liquid is introduced into the crystallizer 1. However, since the diameter of the pipeline connecting the fresh water storage tank 16 and the fine crystal tank 17 is much smaller than the volume of the fine crystal tank 17, it takes a certain amount of time to make the concentration of the decomposition liquid reach the standard matching the amount of low-sodium carnallite ore. In this way, it is difficult to add the decomposition liquid of the required concentration to the crystallizer 1 in time according to the amount of low-sodium carnallite ore, resulting in the decomposition liquid of the required concentration. There is a time lag in adding the low sodium carnallites to the crystallizer 1. Thus, on the one hand, the solubility of the mother liquor will be reduced, which may easily lead to insufficient decomposition of the low sodium carnallites, thereby affecting the quality and output of the decomposition and crystallization processes, and further affecting the continuity and stability of the production process. On the other hand, it is difficult to add the required concentration of decomposition liquid to the crystallizer 1 in time according to the amount of low sodium carnallites, which is not conducive to the speed control of the decomposition and crystallization process, resulting in part of the low sodium carnallites not being effectively decomposed and crystallized and entering the screening part 21 through the bottom flow pipeline of the crystallizer 1, and then entering the tailing salt pool 30, resulting in waste of low sodium carnallites.
[0033] Therefore, if Figure 1 and Figure 2 As shown, in the embodiment of the utility model, the crystallizer 1 body also has an overflow area 9, and the overflow area 9 is located above the sedimentation area 4. The potassium chloride preparation system also includes: a fresh water storage tank 16 for storing fresh water; a fine crystal tank 17, which is connected to the overflow area 9, and the fine crystal tank 17 is used to receive the overflow mother liquor in the overflow area 9; a decomposition liquid forming component, including a power pump, a first branch 18, a second branch 19 and a main pipeline 20, the first branch 18 is used to connect the fresh water storage tank 16 and the inlet of the main pipeline 20, the second branch 19 is used to connect the fine crystal tank 17 and the inlet of the main pipeline 20, the outlet of the main pipeline 20 is connected to the inlet of the power pump, and the outlet of the power pump is connected to the decomposition liquid pipeline 5.
[0034] In the above technical scheme, on the one hand, by setting the first branch 18, the second branch 19 and the main pipeline 20, the fresh water in the fresh water storage tank 16 flows to the inlet of the main pipeline 20 through the first branch 18, and the overflow mother liquor in the fine crystal tank 17 flows to the inlet of the main pipeline 20 through the second branch 19, so that the fresh water and the overflow mother liquor are gathered in the main pipeline 20. In this way, the fresh water and the overflow mother liquor can be mixed in the main pipeline 20 to form a decomposition liquid of the required concentration in time, so that the decomposition liquid can be added to the crystallizer 1 in time and contact with the low-sodium carnallite of the corresponding mineral amount, thereby avoiding the problem of delayed addition of the decomposition liquid of the required concentration to the crystallizer 1 with the low-sodium carnallite of the corresponding mineral amount, which can not only avoid affecting the quality and output of the decomposition and crystallization processes, but also avoid affecting the continuity and stability of the production process, and also avoid waste.
[0035] Specifically, in the embodiment of the utility model, the decomposition liquid at the outlet of the main pipeline 20 flows into the inlet of the power pump, and the power pump can accelerate and pressurize the decomposition liquid so that the decomposition liquid enters the decomposition area 2 of the crystallizer 1 through the outlet of the power pump and the decomposition liquid pipeline 5 in turn.
[0036] Preferably, in an embodiment of the present invention, the power pump is a centrifugal pump.
[0037] like Figure 1 and Figure 2 As shown, in an embodiment of the utility model, the potassium chloride preparation system also includes: a low-sodium carnallites forming part, which is used to form low-sodium carnallites, the outlet of the low-sodium carnallites forming part is connected to the decomposition area 2 of the crystallizer body 10, and a detection component is provided at the outlet of the low-sodium carnallites forming part, and the detection component is used to detect the amount of low-sodium carnallites ore, and a first control valve is provided on the first branch 18; the detection component is control-connected to the first control valve, and the first control valve controls the flow of the first branch 18 according to the amount of low-sodium carnallites ore detected by the detection component.
[0038] Through the above-mentioned arrangement, the detection component can detect the amount of low-sodium carnallites, and calculate the required fresh water flow rate in real time according to the functional relationship between the amount of low-sodium carnallites and fresh water, and then control the fresh water flow rate in the first branch 18 in real time through the first control valve, thereby controlling the concentration of the decomposition liquid in the main pipeline 20, so as to obtain the concentration of the decomposition liquid matching the amount of low-sodium carnallites, so as to achieve the purpose of rate-controlled decomposition and rate-controlled crystallization, thereby improving the dissolution efficiency of low-sodium carnallites.
[0039] Specifically, in the embodiment of the utility model, the functional relationship between the amount of low-sodium carnallite and the fresh water flow rate is C=(0.46~0.64)×M, wherein M is the amount of low-sodium carnallite, C is the fresh water flow rate, and the flow rate of the overflow mother liquor in the second branch 19 can be set to a fixed value according to actual needs, or the functional relationship between the flow rate of the overflow mother liquor and the amount of low-sodium carnallite can be set.
[0040] It should be noted that, in the embodiments of the present invention, the amount of low-sodium carnallite refers to the mass of low-sodium carnallite entering the crystallizer 1 per minute.
[0041] Preferably, in the embodiment of the utility model, the first control valve is configured as a throttle valve, and the purpose of controlling the fresh water flow is achieved by adjusting the throttle port area between the valve core and the valve body. The specific structure of the throttle valve can refer to the prior art and will not be repeated here.
[0042] like Figure 1 As shown, in the embodiment of the utility model, a second control valve is provided on the main pipeline 20, and the second control valve is control-connected with the detection component, and the second control valve controls the flow of the main pipeline 20 according to the amount of low-sodium carnallite ore detected by the detection component.
[0043] Through the above arrangement, the detection component can detect the amount of low-sodium carnallites, calculate the required flow rate of the decomposition liquid according to the functional relationship between the amount of low-sodium carnallites and the decomposition liquid, and then control the flow rate of the decomposition liquid in the main pipeline 20 in real time through the second control valve, so as to achieve the purpose of controlled rate decomposition and controlled rate crystallization, thereby improving the dissolution efficiency of the low-sodium carnallites; further, the real-time fresh water flow rate is first obtained through the functional relationship between the amount of low-sodium carnallites and the real-time fresh water flow rate to adjust the concentration of the decomposition liquid, and then the functional relationship between the real-time decomposition liquid flow rate and the real-time low-sodium carnallites is obtained to realize the real-time addition of the decomposition liquid flow rate, thereby solving the problems of low allocation efficiency and adjustment accuracy in the existing adjustment mechanism.
[0044] Specifically, in the embodiment of the present invention, the functional relationship between the amount of low-sodium carnallite and the flow rate of the decomposition liquid is C1=(2.45-4.673)M / 1.3, wherein M is the amount of low-sodium carnallite and C1 is the flow rate of the decomposition liquid.
[0045] Preferably, in the embodiment of the utility model, the second control valve is configured as a throttle valve, and the purpose of controlling the flow rate of the decomposition liquid is achieved by adjusting the throttle port area between the valve core and the valve body. The specific structure of the throttle valve can refer to the prior art and will not be repeated here.
[0046] like Figure 1 and Figure 2 As shown, in an embodiment of the utility model, an underflow pipeline connected to the sedimentation area 4 is provided at the bottom of the crystallizer body 10, and the potassium chloride preparation system also includes a screening part 21, a first concentrating device 22 and a tailing salt pool 30. The screening part 21 is used to separate the ore pulp and large solid particles. The underflow pipeline is connected to the inlet of the screening part 21, the inlet of the first concentrating device 22 is connected to the ore pulp outlet of the screening part 21, and the solid outlet of the screening part 21 is connected to the tailing salt pool 30.
[0047] In the above technical scheme, after the low-sodium carnallite is fully reacted and crystallized in the crystallizer 1, it is transported to the inlet of the screening section 21 through the bottom flow pipeline. The screening section 21 separates large solid particles from the slurry. The large solid particles are transported to the tailing salt pool 30 through the solid outlet of the screening section 21, and the slurry is transported to the inlet of the first concentrator 22 through the slurry outlet of the screening section 21.
[0048] Specifically, in the embodiment of the utility model, the above-mentioned slurry is composed of small solid particles and mother liquor, the small solid particles are potassium chloride crystals, and the large solid particles include potassium chloride crystals and / or low-sodium carnallite particles.
[0049] like Figure 1 As shown, in an embodiment of the utility model, the potassium chloride preparation system also includes a crude potassium concentrate section, which includes a crude potassium vibration device 23, a crude potassium concentrator 24, a first dehalogenation device 25, a washing device 26, a solid-liquid separation device 27 and a drying device 28 that are sequentially connected, the drying device 28 is connected to the solid outlet of the solid-liquid separation device 27, and the crude potassium vibration device 23 is connected to the outlet of the first concentrator 22.
[0050] In the above technical scheme, after being concentrated by the first concentrator 22, the slurry enters the crude potassium vibration device 23 for vibration, and then enters the crude potassium thickener 24, the first dehalogenation device 25, the washing device 26, the solid-liquid separation device 27 and the drying device 28 in sequence, so as to perform buffering sedimentation, dehalogenation, washing, solid-liquid separation and drying on the crude potassium in sequence to realize the production of potassium chloride, so that the production and recovery rate of potassium chloride can be improved.
[0051] Specifically, in the embodiment of the present invention, the first dehalogenation device 25 is a crude potassium belt machine.
[0052] It should be noted that, in the embodiment of the utility model, the specific structures of the crude potassium vibration device 23, the crude potassium thickener 24, the first dehalogenation device 25, the washing device 26, the solid-liquid separation device 27 and the drying device 28 can adopt the existing technology, which will not be repeated here.
[0053] like Figure 1 As shown, in an embodiment of the utility model, the potassium chloride preparation system also includes an overflow recovery thickener 29, the inlet of the overflow recovery thickener 29 is connected to the fine crystal tank 17, the bottom flow outlet of the overflow recovery thickener 29 is connected to the first dehalogenation device 25, and the overflow outlet of the overflow recovery thickener 29 is connected to the tailing salt pool 30.
[0054] In the above technical scheme, by connecting the inlet of the overflow recovery thickener 29 with the fine crystal tank 17, the overflow mother liquor in the fine crystal tank 17 is secondary recovered through the overflow recovery thickener 29 to recover the solid phase potassium chloride in the overflow mother liquor, and then the solid phase potassium chloride is transported to the first dehalogenation device 25 for dehalogenation to produce potassium chloride, and the overflow of the overflow recovery thickener 29 is discharged to the tail salt pool 30. In this way, the recovery rate of potassium chloride can be improved, thereby reducing the waste of potassium chloride resources.
[0055] Specifically, in an embodiment of the utility model, the potassium chloride preparation system further includes a second concentrator 11, a flotation device 12, a third concentrator 13 and a second dehalogenation device 14 which are connected in sequence, and the outlet of the second dehalogenation device 14 is connected to the decomposition area 2 of the crystallizer 1, so that the raw carnallite slurry is concentrated by the second concentrator 11, that is, the ore thickener, and the concentration is increased to 25%-35%, and the raw carnallite slurry of 25%-35% enters the flotation device 12, is fully contacted with the sodium flotation agent and slurry is adjusted and stirred, and the concentrated raw carnallite slurry enters the reverse flotation process, and the sodium chloride and the sodium flotation agent are combined by the aeration and stirring action of the flotation machine, and the sodium chloride is lifted to the upper layer of the liquid surface under the action of the sodium flotation agent and the bubbles and scraped to the tailing salt pool, and the bottom flow slurry of the flotation device produces low-sodium carnallite slurry. The low sodium carnallite slurry is passed through the third concentrator 13, i.e., the low sodium thickener, to increase the concentration of the low sodium carnallite to 65%-90%, i.e., the concentration required by the production process. The low sodium carnallite slurry is dehalogenated by the second dehalogenation device 14 to form a low sodium carnallite filter cake with a moisture content of 15%-30%, and the low sodium carnallite filter cake is transported to the crystallizer 1 for controlled rate decomposition and controlled rate crystallization, wherein the raw material carnallite slurry is a mixture of carnallite and sodium chloride, and the subsequent process has been described in detail above, which will not be repeated here.
[0056] It should be noted that, in the embodiment of the present invention, the specific structures of the second concentrator 11, the flotation device 12, the third concentrator 13 and the second dehalogenation device 14 can adopt the existing technology, which will not be described in detail here.
[0057] It should be noted that in the embodiment of the utility model, the first dehalogenation device 25 and the second dehalogenation device 14 can achieve the effect of retaining solid particles and precipitating the filtrate. Dehalogenation is a process that uses a substance (or object) with many pores as a medium to allow water in the water-containing material to pass through the pores and retain solid particles on the other side of the medium to achieve a separation effect, wherein the medium used for filtering is called a filter medium (such as a filter cloth), and the solid part retained by the filter medium is called a filter residue or a filter cake. The first dehalogenation device 25 and / or the second dehalogenation device 14 can specifically be a horizontal belt filter, a centrifuge, etc.
[0058] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: the rotating shaft can be rotated under the action of the motor, and the rotating shaft drives the stirring impeller to rotate, thereby stirring the solid low-sodium carnallite particles in the decomposition area, wherein the solid small-particle low-sodium carnallite can be dissolved, the solid large-particle low-sodium carnallite will be partially dissolved, and the incompletely dissolved solid large-particle low-sodium carnallite will settle to the bottom of the decomposition area; in the utility model, the decomposition liquid pipeline is passed through the crystallizer body, and the distance between the decomposition liquid pipeline and the stirring impeller is 2m to 5m. In this way, on the one hand, compared with the prior art in which the decomposition liquid pipeline is set at the top of the crystallizer, which causes the solid large-particle low-sodium carnallite to be incompletely decomposed and settle to the decomposition area As for the bottom of the domain, the decomposition liquid in the utility model can be directly introduced into the decomposition area to directly contact with the solid large-particle low-sodium carnallites that are not completely decomposed and precipitated in the upper layer, and under the stirring action of the stirring impeller, the decomposition liquid can fully contact with the solid large-particle low-sodium carnallites that are not completely dissolved, so as to accelerate the dissolution of the solid large-particle low-sodium carnallites, thereby effectively decomposing the solid large-particle low-sodium carnallites, so as to avoid the problem of potassium chloride being dissolved in the washing process due to the low quality of crude potassium, thereby improving the recovery rate of potassium chloride; on the other hand, the decomposition liquid can be better integrated with the mother liquor in the crystallizer body, so as to avoid the decomposition liquid from directly contacting with the solid small-particle low-sodium carnallites located in the upper layer, thereby avoiding the conversion of part of the potassium chloride into liquid K + , thereby solving the problem of low potassium chloride recovery rate in the prior art.
[0059] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A potassium chloride preparation system, characterized in that, The invention comprises a crystallizer (1), wherein the crystallizer (1) comprises: A crystallizer body (10) has a decomposition region (2), a crystallization region (3) and a sedimentation region (4) arranged in sequence from the inside to the outside; a stirring member, comprising a motor (6), a rotating shaft (7) connected to an output shaft of the motor (6), and a stirring impeller (8) connected to the outer periphery of the rotating shaft (7), wherein the motor (6) is arranged on the crystallizer body (10), the rotating shaft (7) is rotatably arranged on the crystallizer body (10), and the stirring impeller (8) is located in the decomposition region (2); A decomposition liquid pipeline (5) is provided in the crystallizer body (10) along the radial direction of the crystallizer body (10); the outlet of the decomposition liquid pipeline (5) is connected to the decomposition area (2); the inlet of the decomposition liquid pipeline (5) is used for introducing decomposition liquid; and a distance L is provided between the central axis of the decomposition liquid pipeline (5) and the stirring impeller (8), 2m≤L≤5m.
2. The potassium chloride preparation system according to claim 1, characterized in that: The distance L is equal to 3 m.
3. The potassium chloride preparation system according to claim 1, characterized in that: The crystallizer body (10) further comprises an overflow area (9), wherein the overflow area (9) is located above the sedimentation area (4). The potassium chloride preparation system further comprises: A fresh water storage tank (16) for storing fresh water; A fine crystal tank (17) is connected to the overflow area (9), and the fine crystal tank (17) is used to receive the overflow mother liquor in the overflow area (9); The decomposition liquid forming component comprises a power pump, a first branch (18), a second branch (19) and a main pipeline (20), wherein the first branch (18) is used to connect the fresh water storage tank (16) and the inlet of the main pipeline (20), the second branch (19) is used to connect the fine crystal tank (17) and the inlet of the main pipeline (20), the outlet of the main pipeline (20) is connected to the inlet of the power pump, and the outlet of the power pump is connected to the decomposition liquid pipeline (5).
4. The potassium chloride preparation system according to claim 3, characterized in that: The potassium chloride preparation system also includes: a low-sodium carnalite forming part, used for forming low-sodium carnalite, wherein the outlet of the low-sodium carnalite forming part is in communication with the decomposition region (2) of the crystallizer body (10), a detection component is provided at the outlet of the low-sodium carnalite forming part, and the detection component is used for detecting the amount of low-sodium carnalite ore, and a first control valve is provided on the first branch (18); The detection component is controllably connected to the first control valve, and the first control valve controls the flow of the first branch (18) according to the amount of the low-sodium carnallite ore detected by the detection component.
5. The potassium chloride preparation system according to claim 4, characterized in that: The main pipeline (20) is provided with a second control valve, the second control valve is control-connected to the detection component, and the second control valve controls the flow of the main pipeline (20) according to the amount of low-sodium carnallite detected by the detection component.
6. The potassium chloride preparation system according to any one of claims 1 to 5, characterized in that: An underflow pipeline communicating with the settling area (4) is provided at the bottom of the crystallizer body (10). The potassium chloride preparation system further comprises a screening section (21), a first concentrator (22) and a tailing salt pool (30). The screening section (21) is used to separate ore pulp and large solid particles. The underflow pipeline is communicated with the inlet of the screening section (21), the inlet of the first concentrator (22) is communicated with the ore pulp outlet of the screening section (21), and the solid outlet of the screening section (21) is communicated with the tailing salt pool (30).
7. The potassium chloride preparation system according to any one of claims 3 to 5, characterized in that: The potassium chloride preparation system also includes a crude potassium concentrate section, which includes a crude potassium vibration device (23), a crude potassium concentrator (24), a first dehalogenation device (25), a washing device (26), a solid-liquid separation device (27) and a drying device (28) which are connected in sequence, wherein the drying device (28) is connected to the solid outlet of the solid-liquid separation device (27), and the crude potassium vibration device (23) is configured to be connected to the outlet of the first concentrator (22).
8. The potassium chloride preparation system according to claim 7, characterized in that: The potassium chloride preparation system further comprises an overflow recovery thickener (29), the inlet of the overflow recovery thickener (29) being connected to the fine crystal tank (17), the bottom flow outlet of the overflow recovery thickener (29) being connected to the first dehalogenation device (25), and the overflow outlet of the overflow recovery thickener (29) being configured to be connected to a tailing salt pool (30).