Potassium chloride recovery device

Abstract

The utility model discloses a potassium chloride recovery device, and relates to the technical field of chemical production, the potassium chloride recovery device comprises a saline water storage tank, an evaporation crystallizer, a centrifugal machine and a drying machine, and a stirring device is arranged in the saline water storage tank; a circulating type evaporative crystallization system is arranged in the evaporative crystallizer, and the saline water storage tank is communicated with the circulating type evaporative crystallization system; the centrifugal machine is communicated with the evaporation crystallizer, and a spiral centrifugal assembly is arranged in the centrifugal machine; the dryer communicates with the centrifugal machine, a flow guide assembly is arranged in the dryer, and a heating coil is arranged outside the dryer. According to the method, carbonic acid alkenyl ester is subjected to splitting and high-temperature calcination decarburization, powder is subjected to primary gas-solid separation through a settler, then is introduced into a filter for secondary gas-solid separation and then is introduced into a saline water storage tank for dissolution, a dissolved solution is subjected to evaporative crystallization through an evaporative crystallizer and then is introduced into a centrifugal machine, and water in potassium chloride crystals is separated; and drying the potassium chloride crystal by using a drying machine so as to recover the potassium chloride in the carbonic acid alkene ester.

Description

Technical Field

[0001] This application relates to the field of chemical production technology, specifically to a potassium chloride recovery device. Background Technology

[0002] Potassium salts are an important mineral resource. With the development of the new energy field, carbonate esters are an important raw material for lithium-ion battery electrolytes. They will produce more than 200,000 tons of potassium chloride annually, which contains organic impurities, coking products, heavy metals, etc., and cannot be directly reused. Recycling and comprehensive utilization of potassium chloride has important economic benefits and strategic significance. Utility Model Content

[0003] The main objective of this application is to provide a potassium chloride recovery device for recovering and utilizing potassium chloride from carbonate esters.

[0004] The technical solution adopted in this application is as follows:

[0005] A potassium chloride recovery device, comprising:

[0006] A brine storage tank, wherein a stirring device is installed inside the brine storage tank;

[0007] An evaporator crystallizer, wherein a circulating evaporator crystallizer system is provided inside the evaporator crystallizer, and the brine storage tank is connected to the circulating evaporator crystallizer system;

[0008] A centrifuge, which is connected to the evaporator crystallizer, and a spiral centrifugal assembly is provided inside the centrifuge;

[0009] A dryer is connected to the centrifuge. The dryer is equipped with a flow guiding component inside and a heating coil is installed outside the dryer.

[0010] Optionally, the brine storage tank is equipped with a potassium chloride solution inlet pipe and a potassium chloride solution outlet pipe, and the stirring device includes a stirring motor located at the top of the brine storage tank and a stirring shaft located at the output end of the stirring motor, with stirring blades provided on the stirring shaft.

[0011] Optionally, the circulating evaporation crystallization system includes:

[0012] A flow guide tube, which is built into the evaporator crystallizer;

[0013] A circulating heat pump is connected to the outlet pipe of the potassium chloride solution.

[0014] A heating chamber, which is connected to the circulating heat pump, and the heating chamber is connected to the guide tube through an upper circulation pipe;

[0015] The lower circulation pipe is located at the bottom of the evaporator crystallizer and is connected to the circulating heat pump.

[0016] Optionally, the upper circulation pipe is inserted into the guide tube tangentially.

[0017] Optionally, the guide tube is fixed inside the evaporator crystallizer by a channel-type support frame.

[0018] Optionally, the top of the evaporator crystallizer is provided with a secondary steam outlet, and the bottom of the evaporator crystallizer is provided with a crystal slurry discharge pipe.

[0019] Optionally, the crystal slurry discharge pipe is connected to the top of the centrifuge, and a pump body A is provided on the crystal slurry discharge pipe.

[0020] Optionally, the centrifuge has a crystal discharge pipe at its bottom, the spiral centrifuge assembly includes a spiral feed tube, both ends of which are rotatably connected to the crystal slurry discharge pipe and the crystal discharge pipe, the spiral feed tube has several drainage holes, the top of the spiral feed tube has a driven gear, the top of the centrifuge has a drive motor, the output end of the drive motor extends into the centrifuge, and the output end of the drive motor has a driving gear that meshes with the driven gear.

[0021] Optionally, the spiral feed tube is provided with seated bearings at both ends, and the seated bearings are installed in the centrifuge by brackets.

[0022] Optionally, the flow guiding assembly includes a plurality of flow guiding plates inclinedly disposed within the dryer, the flow guiding plates being staggered among themselves.

[0023] Compared with the prior art, the beneficial effects of this application are:

[0024] The potassium chloride recovery device proposed in this application involves decarbonizing carbonate olefins by high-temperature calcination, pre-separating the powder through a settling device, then passing it through a filter for further gas-solid separation, dissolving it in a brine tank, evaporating and crystallizing the solution in an evaporator, separating the water from the potassium chloride crystals in a centrifuge, and finally drying the potassium chloride crystals in a dryer, thereby recovering potassium chloride from the carbonate olefins. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the potassium chloride recovery device provided in the embodiments of this application from one perspective;

[0026] Figure 2 This is a schematic diagram of the structure of an evaporator crystallizer;

[0027] Figure 3This is a schematic diagram of a centrifuge.

[0028] Explanation of the labels in the attached drawings:

[0029] 1-Brine storage tank; 101-Potassium chloride inlet pipe; 102-Potassium chloride outlet pipe; 103-Stirring motor; 104-Stirring shaft; 105-Stirring blades; 2-Evaporator crystallizer; 201-Guide tube; 202-Upper circulation pipe; 203-Lower circulation pipe; 204-Circulating heat pump; 205-Heating chamber; 206-Secondary steam outlet; 207-Crystal slurry discharge pipe; 208-Trough-type support frame; 3-Centrifuge; 301-Spiral feed pipe; 302-Bearing with seat; 303-Support; 304-Driven gear; 305-Drive motor; 306-Drive gear; 307-Crystal discharge pipe; 308-Drainage hole; 309-Drain pipe; 4-Pump body A; 5-Dryer; 501-Guide plate; 502-Heating coil; 503-Discharge pipe. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0031] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0032] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0034] See attached document Figures 1 to 3 This application provides a potassium chloride recovery device, including a brine storage tank 1, an evaporator crystallizer 2, a centrifuge 3, and a dryer 5. The brine storage tank 1 is used to dissolve the raw powder after high-temperature calcination, the evaporator crystallizer 2 is used to precipitate potassium chloride crystals from the liquid, the centrifuge 3 is used to separate the moisture from the potassium chloride crystals, and the dryer 5 is used to further dry the potassium chloride crystals.

[0035] Specifically:

[0036] like Figures 1 to 3 As shown, the brine storage tank 1 has a potassium chloride solution inlet pipe at the top and a potassium chloride solution outlet pipe at the bottom, and a stirring device inside the tank. Conventionally, the stirring device includes a stirring motor 103, a stirring shaft 104, and stirring blades 105. The stirring motor 103 is fixedly installed on the top of the brine storage tank 1, and the stirring shaft 104 is connected to the output end of the stirring motor 103 via a coupling. The stirring shaft 104 is rotatably connected to the brine storage tank 1 via a bearing 302 and extends into the tank. The stirring blades 105 are fixedly installed on the stirring shaft 104. The stirring device ensures that the raw powder is fully dissolved.

[0037] In the above description, the upper part of the inner cavity of the evaporator crystallizer 2 is the evaporation chamber, the lower part is the collection chamber, and the area between the collection chamber and the evaporation chamber is the settling zone. A secondary steam outlet 206 is provided at the top of the evaporation chamber, and a crystal slurry discharge pipe 207 is provided at the bottom of the collection chamber. The evaporator crystallizer 2 is equipped with a circulating evaporation crystallization system, which includes a guide tube 201, a circulating heat pump 204, an upper circulation pipe 202, and a lower circulation pipe 203. The body of the guide tube 201 is located within the settling zone and is fixed inside the evaporator crystallizer 2 by a channel-type support frame 208. The upper end of the guide tube 201 is located within the settling zone. The lower end of the guide tube 201 is located in the collection chamber. The hot circulation pump is located outside the evaporator crystallizer 2 and has three connecting flanges. One connecting flange is connected to the potassium chloride liquid outlet pipe, and another connecting flange is connected to the heating chamber 205 through a pipe. The heating chamber 205 is connected to the upper circulation pipe 202. The upper circulation pipe 202 enters the evaporator crystallizer 2 from the outside to the inside and enters the interior of the guide tube 201 tangentially from the bottom of the guide tube 201. There is also a connecting flange connected to the lower circulation pipe 203, which is located at the bottom of the evaporator crystallizer 2. As can be imagined, after the potassium chloride solution is heated by being pumped into the heating chamber 205 by a heat circulation pump, it enters the guide tube 201 tangentially through the upper circulation pipe 202, and then enters the evaporation chamber from the guide tube 201. The liquid flashes and cools down in the evaporation chamber, and the secondary steam generated by the flashing is discharged from the secondary steam outlet 206. Carnallite crystallizes out of the liquid. The specific gravity of the liquid during the cooling process in the settling zone is greater than that of the liquid in the guide tube 201, so that the low-temperature liquid circulates from top to bottom outside the guide tube 201 to the bottom of the guide tube 201. After entering the heat circulation pump through the lower circulation pipe 203 and being stirred evenly with the newly entered high-temperature liquid, it enters the guide tube 201 again to participate in the next cycle. During the circulation process, carnallite continuously precipitates and crystallizes on the existing carnallite particles, causing the particles to grow larger. When the carnallite particles grow to a certain size, their settling velocity exceeds the rising velocity of the liquid, causing the larger particles to settle to the bottom of the cooling crystallizer and be discharged. The smaller carnallite particles continue to participate in the circulation until they grow to a certain size and fall to the bottom to be discharged. Furthermore, it is advantageous that the liquid is fed tangentially into the guide tube 201, causing the potassium chloride solution to rotate along the tube wall within the guide tube 201, thereby reducing scaling on the tube wall.

[0038] At the same time, as Figures 1 to 3As shown, the crystal discharge pipe 207 is connected to the top of the centrifuge 3, and a pump body A4 is installed on the crystal discharge pipe 207. The bottom of the centrifuge 3 is provided with a crystal discharge pipe 307, and a spiral centrifugal assembly is installed inside the centrifuge 3. The spiral centrifuge assembly includes a spiral feed tube 301 with numerous drainage holes 308 evenly distributed on it. The diameter of the drainage holes 308 is smaller than the particle size of potassium chloride crystals. Both ends of the spiral feed tube 301 are straight tubes. A crystal discharge pipe 207 is inserted into the upper straight tube and can rotate, and a crystal discharge pipe 307 is inserted into the lower straight tube and can rotate. Both ends of the straight tubes are equipped with seated bearings 302, which are installed inside the centrifuge 3 via brackets 303, so that the spiral feed tube 301 can rotate inside the centrifuge 3. At the same time, a driven gear 304 is fixedly fitted on the top straight tube of the spiral feed tube 301. A drive motor 305 is fixedly installed on the top of the centrifuge 3. The output end of the drive motor 305 extends into the centrifuge 3 and is connected to the wall of the centrifuge 3 via a bearing. The output end of the drive motor 305 is provided with a drive gear 306, which meshes with the driven gear 304. Therefore, it can be imagined that when the crystal slurry enters the spiral feed tube 301, the drive motor 305 drives the spiral feed tube 301 to rotate. As the crystal slurry falls along the spiral feed tube 301, it is subjected to centrifugal force due to rotation, thereby throwing water out from the drain hole 308 and the crystals into the crystal discharge pipe 307. Of course, a drain pipe 309 is also provided at the bottom of the centrifuge 3 to facilitate the discharge of water from the centrifugation.

[0039] Finally, as Figures 1 to 3 As shown, the crystal discharge pipe 307 is connected to the top of the dryer 5, and a pump body B is installed on the crystal discharge pipe 307. A flow guiding assembly is installed inside the dryer 5, consisting of several inclined flow guiding plates 501 arranged alternately within the dryer 5. A heating coil 502 is installed around the outer periphery of the dryer 5, and a discharge pipe 503 is installed at the bottom of the dryer 5. It can be imagined that the crystals fall from the crystal discharge pipe 307 onto the flow guiding plates 501, descending layer by layer along the flow guiding plates 501 to the bottom of the dryer 5, and are discharged through the discharge pipe 503. The layered and interlaced flow guiding plates 501 can prolong the residence time of the crystals within the dryer 5, thereby helping to improve the drying effect on the crystals.

[0040] As can be seen, the potassium chloride recovery device provided in this application, after the carbonate ester is decarbonized by high-temperature calcination in the preceding process, the powder is first separated into gas and solid by a settling device and then separated into gas and solid by a filter. It is then fed into a brine storage tank for dissolution. The dissolved solution is then evaporated and crystallized by an evaporator crystallizer. After that, it is fed into a centrifuge to separate the water from the potassium chloride crystals. Finally, the potassium chloride crystals are dried by a dryer, thereby recovering potassium chloride from the carbonate ester.

[0041] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A potassium chloride recovery device, characterized in that, include: A brine storage tank, wherein a stirring device is installed inside the brine storage tank; An evaporator crystallizer, wherein a circulating evaporator crystallizer system is provided inside the evaporator crystallizer, and the brine storage tank is connected to the circulating evaporator crystallizer system; A centrifuge, which is connected to the evaporator crystallizer, and a spiral centrifugal assembly is provided inside the centrifuge; A dryer is connected to the centrifuge. The dryer is equipped with a flow guiding component inside and a heating coil is installed outside the dryer.

2. The potassium chloride recovery device according to claim 1, characterized in that, The brine storage tank is equipped with a potassium chloride solution inlet pipe and a potassium chloride solution outlet pipe. The stirring device includes a stirring motor located at the top of the brine storage tank and a stirring shaft located at the output end of the stirring motor. The stirring shaft is equipped with stirring blades.

3. The potassium chloride recovery device according to claim 2, characterized in that, The circulating evaporation crystallization system includes: A flow guide tube, which is built into the evaporator crystallizer; A circulating heat pump is connected to the outlet pipe of the potassium chloride solution. A heating chamber, which is connected to the circulating heat pump, and the heating chamber is connected to the guide tube through an upper circulation pipe; The lower circulation pipe is located at the bottom of the evaporator crystallizer and is connected to the circulating heat pump.

4. The potassium chloride recovery device according to claim 3, characterized in that, The upper circulation pipe enters the guide tube tangentially.

5. The potassium chloride recovery device according to claim 3, characterized in that, The guide tube is fixed inside the evaporator crystallizer by a channel-type support frame.

6. The potassium chloride recovery device according to claim 3, characterized in that, The top of the evaporator crystallizer is provided with a secondary steam outlet, and the bottom of the evaporator crystallizer is provided with a crystal slurry discharge pipe.

7. The potassium chloride recovery device according to claim 6, characterized in that, The crystal slurry discharge pipe is connected to the top of the centrifuge, and a pump body A is installed on the crystal slurry discharge pipe.

8. The potassium chloride recovery device according to claim 7, characterized in that, The centrifuge has a crystal discharge pipe at its bottom. The spiral centrifuge assembly includes a spiral feed tube. Both ends of the spiral feed tube are rotatably connected to the crystal slurry discharge pipe and the crystal discharge pipe. The spiral feed tube has several drainage holes. The top of the spiral feed tube has a driven gear. The top of the centrifuge has a drive motor. The output end of the drive motor extends into the centrifuge, and the output end of the drive motor has a driving gear that meshes with the driven gear.

9. The potassium chloride recovery device according to claim 8, characterized in that, Both ends of the spiral feed tube are equipped with seated bearings, which are mounted inside the centrifuge via brackets.

10. The potassium chloride recovery device according to claim 1, characterized in that, The flow guiding assembly includes a plurality of flow guiding plates inclinedly disposed within the dryer, the flow guiding plates being arranged alternately.

Images