Device and process for recovering potassium perchlorate from potassium perchlorate waste brine

Abstract

The invention belongs to the technical field of potassium perchlorate recovery, and particularly relates to a device and process for recovering potassium perchlorate from potassium perchlorate waste brine, the device comprises an evaporation tank, a high-temperature evaporation assembly is installed at the top of the evaporation tank, and a baffle, a transmission assembly and a concentration testing assembly are installed in the evaporation tank. When the concentration of potassium perchlorate in mother liquor needs to be measured, an air cylinder drives a test board to move downwards through a push rod, the test board drives a push-pull rod to move downwards through a bottom plate, and the mother liquor in an evaporation tank enters a cooling cylinder by rotating a first rotating disc; after a certain amount of mother liquor enters the cooling cylinder, the first turntable blocks the first base disc, the liquid cooling radiator cools the mother liquor in the cooling cylinder, and after the temperature is reduced to normal temperature, the push-pull rod continues to drive the second base disc and the second turntable to move, and the mother liquor in the cooling cylinder enters the test tube through the second turntable and the second base disc; the concentration of potassium perchlorate in the mother liquor is tested through the detector, so that the thermal drift of the detector is avoided while the concentration calculation precision of the detector is improved.

Description

Technical Field

[0001] This invention belongs to the field of potassium perchlorate recovery technology, specifically relating to an apparatus and process for recovering potassium perchlorate from potassium perchlorate waste brine. Background Technology

[0002] Potassium perchlorate is one of the important types of perchlorates, mainly used in the manufacture of fireworks, safety matches, explosives, weather rockets, domestic ignition coal, and oxidizers. Existing potassium perchlorate waste brine contains residual sodium chloride and potassium perchlorate.

[0003] The production process of potassium perchlorate generates a large amount of potassium perchlorate waste brine. Therefore, the key is to collect the sodium chloride and potassium perchlorate from the mother liquor. Existing technology relies on stepwise crystallization to separate them based on their solubility differences. Sodium chloride solubility is less affected by temperature, so high-temperature evaporation and concentration are used to precipitate and separate it. Potassium perchlorate solubility decreases significantly with decreasing temperature, so low-temperature cooling crystallization is used to recover it.

[0004] During the process of precipitating sodium chloride from the mother liquor by high-temperature evaporation, it is necessary to ensure that the mass percentage concentration of potassium perchlorate is within the range of 8.2% to 11.3%. Within this concentration range, the supersaturation of potassium perchlorate is moderate, which can ensure that there is sufficient driving force to promote crystal precipitation during the subsequent cooling and crystallization of potassium perchlorate, while avoiding the formation of fine particles due to excessively high concentration and excessively fast nucleation rate.

[0005] Therefore, when evaporating and concentrating sodium chloride, it is necessary to measure the concentration of potassium perchlorate in the mother liquor in a timely manner. The existing technology uses ion chromatography to measure the concentration of potassium perchlorate. However, ion chromatography is affected by the temperature of the mother liquor. During the evaporation and concentration of sodium chloride, the temperature can reach 110 degrees Celsius, which causes thermal drift of the detector and leads to an overestimation of the concentration. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing an apparatus and process for recovering potassium perchlorate from potassium perchlorate waste brine, thereby solving the technical problems in the prior art.

[0007] The objective of this invention can be achieved through the following technical solution: An apparatus for recovering potassium perchlorate from waste potassium perchlorate brine, comprising an evaporator, a high-temperature evaporation assembly installed at the top of the evaporator, gas-liquid inlet / outlet pipes and a drain pipe respectively installed on the evaporator, a movable baffle installed inside the evaporator, and a transmission assembly installed at the bottom of the evaporator. The transmission assembly is connected to a concentration testing assembly, which includes a cooling cylinder, a base plate fixedly installed inside the cooling cylinder, and a turntable rotatably installed inside the cooling cylinder. The turntable rotates to seal the base plate. A liquid-cooled radiator is installed on the outer wall of the cooling cylinder. The transmission assembly includes a cylinder, with a push rod connected to the cylinder's output end. A test platform is mounted on the push rod, and a detector is installed inside the test platform. The detector is connected to a top plate, and the top plate is connected to the bottom of a cooling cylinder. A push-pull rod is slidably installed inside the cooling cylinder and is slidably connected to the test platform. A second base plate is mounted on the push-pull rod, and a second turntable is rotatably mounted on the second base plate. The second turntable rotates and seals the second base plate. A top plate and a bottom plate are respectively mounted on the push-pull rod, and the test platform slides between the top plate and the bottom plate. When the cylinder drives the test platform downward through the push rod, the test platform moves the push-pull rod through the bottom plate, and the test tube expands. When the cylinder drives the test platform upward through the push rod, the test platform moves the push-pull rod through the top plate, and the test tube compresses.

[0008] As a further optimization or improvement to this solution, an annular disk is installed at the bottom of the evaporator, and the liquid-cooled radiator is fixedly installed on the annular disk.

[0009] As a further optimization or improvement of this solution, a built-in sliding groove is provided inside the push-pull rod. The built-in sliding groove slides in conjunction with the slide block. A motor is installed on the slide block. The motor is connected to the turntable one through a rotating shaft, and the motor drives the turntable one to rotate.

[0010] As a further optimization or improvement of this solution, a strip-shaped groove is provided on the inner wall of the cooling cylinder, and a spiral groove is provided at the bottom of the inner wall of the cooling cylinder. The strip-shaped groove and the spiral groove are connected, and the rotating disk slides in cooperation with the strip-shaped groove and the spiral groove.

[0011] As a further optimization or improvement of this solution, a transverse sliding groove is provided at the bottom of the test platform, and a transverse rod is slidably installed inside the transverse sliding groove. A first active rack and a second active rack are respectively installed at both ends of the transverse rod, and a magnetic block is installed on the transverse rod. Electromagnetic chucks 2 and 1 are respectively installed on the side walls of the transverse sliding groove. Guide rods are respectively installed on both sides of the bottom of the baffle, and the guide rods slide in cooperation with the annular disk. A driven rack is installed at the bottom of the guide rod. One driven rack meshes with a gear, and the other driven rack meshes with a reduction gear set. When the push rod moves down, electromagnetic chuck 1 attracts the magnetic block, and the first active rack on the transverse rod meshes with the reduction gear set. When the push rod moves up, electromagnetic chuck 2 attracts the magnetic block, and the second active rack on the transverse rod meshes with the gear.

[0012] As a further optimization or improvement to this solution, a base is installed at the bottom of the evaporator; the high-temperature evaporation assembly includes a hot air blower installed on the top of the evaporator, the hot air blower being connected to an air plate via a connecting pipe, and the air plate being located inside the evaporator.

[0013] As a further optimization or improvement to this solution, an elastic telescopic head is installed on the inner wall of the evaporator, and a baffle is locked between the elastic telescopic heads.

[0014] A process for recovering potassium perchlorate from potassium perchlorate waste brine, the process being applied to the apparatus for recovering potassium perchlorate from potassium perchlorate waste brine as described above, the process comprising the following steps: Step S1: First, the potassium perchlorate waste brine needs to be filtered to obtain mother liquor. The mother liquor is then added to the evaporator through the gas-liquid inlet and outlet pipes. The high-temperature evaporation component is started, which heats the mother liquor inside the evaporator, causing the mother liquor to evaporate at high temperature and precipitate sodium chloride. Step S2: When it is necessary to measure the concentration of potassium perchlorate in the mother liquor, the cylinder drives the test platform to move down through the push rod, the test tube expands, and at the same time the test platform drives the push-pull rod to move down through the base plate. The push-pull rod drives the base plate and the turntable to move down synchronously. Then, the motor drives the turntable to rotate, so that the through hole on the turntable coincides with the base plate. At this time, the mother liquor inside the evaporator enters the cooling cylinder. Step S3: During the process of the push-pull rod driving the base plate 2 and the turntable 2 to move down, the turntable 2 slides with the strip groove. When a certain amount of mother liquor enters the cooling cylinder, the push-pull rod stops moving, and the motor drives the turntable 1 to rotate, so that the turntable seals the base plate 1, blocking the mother liquor inside the cooling cylinder from the outside. Step S4: Cool the mother liquor inside the cooling cylinder using a liquid cooling radiator. After the temperature drops to room temperature, the push-pull rod continues to move the base plate two and the turntable two. Through the sliding engagement of the turntable two with the spiral groove, the turntable two is rotated, so that the through hole on the turntable two coincides with the base plate two. At this time, the mother liquor inside the cooling cylinder enters the test tube through the turntable two and the base plate two. The concentration of potassium perchlorate in the mother liquor is tested by the detector. Step S5: When the concentration of potassium perchlorate in the mother liquor is lower than 8.2%, evaporation needs to continue. The cylinder of this invention drives the test platform to move up through the push rod. The test platform moves along the push rod first, the test tube is compressed, and the liquid inside the test tube is forced into the cooling cylinder to empty the test tube and avoid residual test liquid inside the test tube, which would affect the accuracy of the next set of measurements. Step S6: As the test platform moves, the test platform drives the push-pull rod to move through the top plate. As the push-pull rod moves upward, the turntable two cooperates with the strip-shaped slide groove, so that the turntable two blocks the base plate two. At the same time, the motor drives the turntable one to rotate, so that the through hole on the base plate one is opened. At this time, the push-pull rod pushes the mother liquor inside the cooling cylinder outward through the base plate two and the turntable two. Step S7: Repeat the above operation and continuously test the concentration of potassium perchlorate in the mother liquor. When the concentration is within the range of 8.2% to 11.3%, the mother liquor is passed into the separator to separate the sodium chloride crystals in the mother liquor. Then, the separated mother liquor is passed into the cooling equipment to cool and crystallize the potassium perchlorate in the mother liquor. The potassium perchlorate is then recovered through the separator.

[0015] The beneficial effects of this invention are: (1) When the present invention needs to measure the concentration of potassium perchlorate in the mother liquor, the cylinder drives the test platform to move down through the push rod, the test tube extends, and at the same time the test platform drives the push-pull rod to move down through the base plate. By rotating the turntable, the mother liquor inside the evaporator enters the cooling cylinder. After a certain amount of mother liquor enters the cooling cylinder, the motor drives the first turntable to rotate, causing the turntable to seal the first base plate. The liquid-cooled radiator cools the mother liquor inside the cooling cylinder. By isolating the mother liquor inside the cooling cylinder from the outside, the cooling of the mother liquor is accelerated. After the temperature drops to room temperature, the push-pull rod continues to drive the second base plate and the second turntable to move. The second turntable rotates, causing the through hole on the second turntable to coincide with the second base plate. At this time, the mother liquor inside the cooling cylinder enters the test tube through the second turntable and the second base plate. The concentration of potassium perchlorate in the mother liquor is measured by the detector, which improves the concentration calculation accuracy of the detector while avoiding thermal drift of the detector.

[0016] (2) The cylinder of the present invention drives the test platform to move up through the push rod. The test platform first moves along the push rod, the test tube is compressed, and the liquid inside the test tube is forced into the cooling cylinder to empty the test tube and avoid residual test liquid inside the test tube, which would affect the measurement of the next group. As the test platform moves, the test platform drives the push rod to move through the top plate. The push rod pushes the mother liquor inside the cooling cylinder out through the base plate and the turntable.

[0017] (3) Before the test platform is moved down by the cylinder, the active rack on the transverse rod meshes with the driven rack on one side through the gear. When the cylinder moves the test platform down, the test platform moves the transverse rod and the active rack simultaneously. At this time, the active rack moves the driven rack and the baffle up through the gear. The baffle lifts the mother liquor inside the evaporator, maintains the mother liquor level, and ensures the heating effect of the high-temperature evaporation component on the mother liquor. Furthermore, since the detector needs a certain amount of time to measure the concentration of potassium perchlorate in the mother liquor, the evaporation time of the mother liquor increases during this process, and the liquid level will decrease accordingly. In order to ensure that the liquid level of the mother liquor remains unchanged after the measurement is completed; When the cylinder of this invention moves the test platform upward, the mother liquor inside the cooling cylinder is sent into the evaporator. The active rack on the transverse rod meshes with the driven rack on the other side through the deceleration gear set. As the test platform moves upward, the test platform drives the baffle to descend through the transverse rod and the active rack. With the cooperation of the active rack, the deceleration gear set and the driven rack, after the push rod is reset, the current position of the baffle is higher than the original position of the baffle, thereby compensating for the evaporation of the mother liquor during the measurement process, so that the liquid level of the mother liquor remains consistent before and after the measurement, and avoids the influence of measuring the potassium perchlorate concentration on the heating of the mother liquor. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the internal structure of the evaporator.

[0021] Figure 3 This is a front view of the internal structure of the evaporator.

[0022] Figure 4 This is a schematic diagram of the connection structure between the transmission component and the concentration testing component.

[0023] Figure 5 for Figure 4 Enlarged view of the structure of part A.

[0024] Figure 6 This is a schematic diagram of the overall structure of the transmission assembly.

[0025] Figure 7 This is an exploded view of the overall structure of the concentration testing component.

[0026] Figure 8 This is a schematic diagram of the connection structure between turntable 2 and base plate 2.

[0027] The diagram shows: 1. Evaporator; 2. Base; 3. High-temperature evaporation assembly; 301. Hot air blower; 302. Connecting pipe; 303. Gas plate; 4. Gas-liquid inlet / outlet pipe; 5. Drain pipe; 6. Baffle; 7. Elastic telescopic head; 8. Transmission assembly; 801. Cylinder; 802. Push rod; 803. Transverse slide; 804. Transverse rod; 805. Magnetic block; 806. Electromagnetic chuck two; 807. Electromagnetic chuck one; 808. Drive rack one; 809. Drive rack two; 810. Reduction gear set; 81 1. Gear; 812. Driven rack; 813. Guide rod; 9. Concentration testing assembly; 901. Cooling cylinder; 902. Base plate one; 903. Turntable one; 904. Turntable two; 905. Base plate two; 906. Push-pull rod; 907. Test tube; 908. Detector; 909. Top plate; 910. Bottom plate; 911. Test platform; 912. Built-in slide groove; 913. Motor; 914. Rotating shaft; 915. Strip slide groove; 916. Spiral slide groove; 10. Liquid cooling radiator; 11. Annular disk. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] See Figures 1-8An apparatus for recovering potassium perchlorate from potassium perchlorate waste brine includes an evaporator 1, a high-temperature evaporation assembly 3 mounted on the top of the evaporator 1, gas-liquid inlet / outlet pipes 4 and a drain pipe 5 mounted on the evaporator 1, a movable baffle 6 installed inside the evaporator 1, and a transmission assembly 8 mounted at the bottom of the evaporator 1. The transmission assembly 8 is connected to a concentration testing assembly 9, which includes a cooling cylinder 901, a base plate 902 fixedly mounted inside the cooling cylinder 901, and a turntable 903 rotatably mounted inside the cooling cylinder 901, which rotatably blocks the base plate 902. A liquid-cooled radiator 10 is mounted on the outer wall of the cooling cylinder 901. The transmission assembly 8 includes a cylinder 801, the output end of which is connected to a push rod 802. A test platform 911 is mounted on the push rod 802, and a detector 908 is installed inside the test platform 911. The detector 908 is connected to the top... A plate 909 is connected to the bottom of a cooling cylinder 901. A push-pull rod 906 is slidably installed inside the cooling cylinder 901. The push-pull rod 906 is slidably connected to a test platform 911. A base plate 905 is installed on the push-pull rod 906. A turntable 904 is rotatably installed on the base plate 905. The turntable 904 rotates to block the base plate 905. A top plate 909 and a bottom plate 910 are respectively installed on the push-pull rod 906. The test platform 911 slides between the top plate 909 and the bottom plate 910. When the cylinder 801 drives the test platform 911 to move downward through the push rod 802, the test platform 911 drives the push-pull rod 906 to move through the bottom plate 910, and the test tube 907 expands. When the cylinder 801 drives the test platform 911 to move upward through the push rod 802, the test platform 911 drives the push-pull rod 906 to move through the top plate 909, and the test tube 907 compresses.

[0030] Specifically, an annular disk 11 is installed at the bottom of the evaporator 1, and the liquid-cooled radiator 10 is fixedly installed on the annular disk 11.

[0031] Specifically, the push-pull rod 906 has an internal sliding groove 912, which slides with the slide block. A motor 913 is installed on the slide block, and the motor 913 is connected to the turntable 903 through a rotating shaft 914. The motor 913 drives the turntable 903 to rotate.

[0032] Specifically, a strip-shaped groove 915 is provided on the inner wall of the cooling cylinder 901, and a spiral groove 916 is provided at the bottom of the inner wall of the cooling cylinder 901. The strip-shaped groove 915 and the spiral groove 916 are connected, and the turntable 904 slides in sliding cooperation with the strip-shaped groove 915 and the spiral groove 916.

[0033] It should be noted that, firstly, the potassium perchlorate waste brine needs to be filtered to obtain mother liquor. The mother liquor is then added to the evaporator 1 through the gas-liquid inlet / outlet pipe 4. The high-temperature evaporation component 3 is then started. The high-temperature evaporation component 3 heats the mother liquor inside the evaporator 1, causing the mother liquor to evaporate at high temperature and precipitate sodium chloride. The sodium chloride crystals precipitate and fall onto the baffle 6.

[0034] When it is necessary to measure the concentration of potassium perchlorate in the mother liquor, the cylinder 801 drives the test platform 911 to move down through the push rod 802, and the test tube 907 extends. At the same time, the test platform 911 drives the push-pull rod 906 to move down through the base plate 910. The push-pull rod 906 drives the base plate 2 905 and the turntable 2 904 to move down synchronously. Then, the motor 913 drives the turntable 1 903 to rotate, so that the through hole on the turntable 1 903 coincides with the base plate 1 902. At this time, the mother liquor inside the evaporator 1 enters the cooling cylinder 901.

[0035] As the push-pull rod 906 moves the base plate 905 and the turntable 904 downwards, the turntable 904 slides into the strip groove 915. At this time, the turntable 904 blocks the through hole on the base plate 905, and the mother liquor is located between the turntable 904 and the turntable 903. After a certain amount of mother liquor enters the cooling cylinder 901, the push-pull rod 906 stops moving, and the motor 913 drives the turntable 903 to rotate, causing the turntable 903 to block the base plate 902, thus isolating the mother liquor inside the cooling cylinder 901 from the outside world. The liquid cooling radiator 10 then cools the cooling cylinder 901. The internal mother liquor is cooled down. After the temperature drops to room temperature, the push-pull rod 906 continues to move the base plate 905 and the turntable 904. The turntable 904 rotates through the sliding engagement with the spiral groove 916, causing the through hole on the turntable 904 to align with the base plate 905. At this time, the mother liquor inside the cooling cylinder 901 enters the test tube 907 through the turntable 904 and the base plate 905. The concentration of potassium perchlorate in the mother liquor is measured by the detector 908, improving the concentration calculation accuracy of the detector 908 and preventing thermal drift. The reason for sending the mother liquor inside the cooling cylinder 901 into the test tube 907 before testing is to prevent the mother liquor inside the cooling cylinder 901 from becoming too cold, which would affect the measurement by the detector 908.

[0036] When the potassium perchlorate concentration in the mother liquor is below 8.2%, evaporation needs to continue. In this invention, cylinder 801 moves test platform 911 upwards via push rod 802. Test platform 911 first moves along push-pull rod 906, compressing test tube 907. The liquid inside test tube 907 is forced into cooling cylinder 901, emptying test tube 907 and preventing residual test liquid from affecting the accuracy of subsequent measurements. As test platform 911 moves, it moves push-pull rod 906 via top plate 909. As push-pull rod 906 moves upwards, turntable 904 engages with strip-shaped groove 915, sealing base plate 905. Simultaneously, motor 913 drives turntable 903 to rotate, opening the through hole on base plate 902. At this time, push-pull rod 906 pushes the mother liquor outwards from cooling cylinder 901 through base plate 905 and turntable 904.

[0037] Repeat the above operation and continuously test the concentration of potassium perchlorate in the mother liquor. When the concentration is within the range of 8.2% to 11.3%, the mother liquor is passed into a separator to separate the sodium chloride crystals from the mother liquor. Then, the separated mother liquor is passed into a cooling device to cool and crystallize the potassium perchlorate in the mother liquor. The potassium perchlorate is then recovered through the separator.

[0038] It should be noted that the liquid inlet of the cooling cylinder 901 is located on both sides of the top. During the process of the mother liquor entering the cooling cylinder 901, the liquid inlets on both sides of the top of the cooling cylinder 901 can prevent sodium chloride crystals from being sucked into the cooling cylinder 901, thereby improving the measurement accuracy of the detector 908. Moreover, by installing a filter plate (not mentioned in the attached figure) at the liquid inlet of the cooling cylinder 901, sodium chloride crystals can also be prevented from entering the cooling cylinder 901.

[0039] It should be noted that a stirring assembly (not mentioned in the attached diagram) can be installed inside the evaporator 1. When drainage is required, the stirring assembly will operate to mix the sodium chloride crystals in the mother liquor, preventing sodium chloride crystals from remaining on the baffle 6. A temperature sensor (not mentioned in the attached diagram) is installed inside the cooling cylinder 901 to test the temperature of the mother liquor; the detector 908 is an ion chromatograph.

[0040] See Figures 2-6 The test bench 911 has a transverse sliding groove 803 at its bottom, and a transverse rod 804 is slidably installed inside the transverse sliding groove 803. A first active rack 808 and a second active rack 809 are respectively installed at both ends of the transverse rod 804. A magnetic block 805 is installed on the transverse rod 804. Electromagnetic chucks 806 and 807 are respectively installed on the side walls of the transverse sliding groove 803. Guide rods 813 are respectively installed on both sides of the bottom of the baffle 6. The guide rods 813 slide in cooperation with the annular disk 11. 13. A driven rack 812 is installed at the bottom; one driven rack 812 meshes with gear 811, and the other driven rack 812 meshes with reduction gear set 810; when push rod 802 moves down, electromagnetic chuck 807 attracts magnetic block 805, and driving rack 808 on transverse rod 804 meshes with reduction gear set 810; when push rod 802 moves up, electromagnetic chuck 806 attracts magnetic block 805, and driving rack 809 on transverse rod 804 meshes with gear 811.

[0041] Specifically, an elastic telescopic head 7 is installed on the inner wall of the evaporator 1, and a baffle 6 is engaged between the elastic telescopic heads 7.

[0042] It should be noted that after the mother liquor enters the cooling cylinder 901, the total amount of mother liquor inside the evaporator 1 decreases, the liquid level drops accordingly, the distance between the high-temperature evaporation component 3 and the mother liquor increases, the heating effect of the high-temperature evaporation component 3 on the mother liquor decreases, which affects the evaporation of the mother liquor to a certain extent and leads to a decrease in recovery efficiency.

[0043] Before the cylinder 801 drives the test platform 911 to move downward, the electromagnetic chuck 806 attracts the magnetic block 805. At this time, the active rack 809 on the transverse rod 804 meshes with the driven rack 812 on one side through the gear 811. When the cylinder 801 drives the test platform 911 to move downward, the test platform 911 drives the transverse rod 804 and the active rack 809 to move synchronously. At this time, the active rack 809 drives the driven rack 812 and the baffle 6 to move upward through the gear 811. The baffle 6 lifts the mother liquor inside the evaporator 1, maintains the mother liquor level, and ensures the heating effect of the high-temperature evaporation component 3 on the mother liquor.

[0044] It should be noted that the detector 908 requires a certain amount of time to measure the concentration of potassium perchlorate in the mother liquor. During this process, the evaporation time of the mother liquor increases, and the liquid level will decrease accordingly. In order to ensure that the liquid level of the mother liquor remains unchanged after the measurement is completed.

[0045] When the cylinder 801 of this invention moves the test platform 911 upward, the mother liquor inside the cooling cylinder 901 is sent into the evaporator 1. At the same time, the second electromagnetic chuck 806 is de-energized, and the first electromagnetic chuck 807 is energized to attract the magnetic block 805. The active rack 808 on the transverse rod 804 meshes with the driven rack 812 on the other side through the reduction gear group 810. As the test platform 911 moves upward, the test platform 911 drives the baffle 6 to descend through the transverse rod 804 and the active rack 808. With the cooperation of the active rack 808, the reduction gear group 810 and the driven rack 812, after the push rod 802 is reset, the current position of the baffle 6 is higher than the original position of the baffle 6, thereby compensating for the evaporation of the mother liquor during the measurement process, so that the liquid level of the mother liquor remains unchanged before and after the measurement, and avoiding the influence of the measurement of potassium perchlorate concentration on the heating of the mother liquor.

[0046] It should be noted that the elastic telescopic head 7 is used to fix the current position of the baffle 6 to prevent the baffle 6 from falling due to weightlessness during the switching process between the active rack 2 809 and the active rack 1 808.

[0047] See Figures 2-3 The evaporator 1 is equipped with a base 2 at the bottom; the high-temperature evaporation assembly 3 includes a hot air blower 301 installed on the top of the evaporator 1, the hot air blower 301 is connected to an air plate 303 through a connecting pipe 302, and the air plate 303 is located inside the evaporator 1.

[0048] It should be noted that the present invention generates hot air through hot air blower 301 and delivers it into the evaporator 1 through connecting pipe 302 and air plate 303 to continuously heat the mother liquor inside the evaporator 1.

[0049] See Figures 1-8 As shown, this invention provides a process for recovering potassium perchlorate from potassium perchlorate waste brine. The process is applied to the potassium perchlorate recovery device described in the above embodiments, and includes the following steps: Step S1: First, the potassium perchlorate waste brine needs to be filtered to obtain mother liquor. The mother liquor is then added to evaporator 1 through gas-liquid inlet / outlet pipe 4. The high-temperature evaporation component 3 is started. The high-temperature evaporation component 3 heats the mother liquor inside evaporator 1, causing the mother liquor to evaporate at high temperature and precipitate sodium chloride. Step S2: When it is necessary to measure the concentration of potassium perchlorate in the mother liquor, the cylinder 801 drives the test platform 911 to move down through the push rod 802, and the test tube 907 extends. At the same time, the test platform 911 drives the push-pull rod 906 to move down through the base plate 910. The push-pull rod 906 drives the base plate 2 905 and the turntable 2 904 to move down synchronously. Then, the motor 913 drives the turntable 1 903 to rotate, so that the through hole on the turntable 1 903 coincides with the base plate 1 902. At this time, the mother liquor inside the evaporator 1 enters the cooling cylinder 901. Step S3: During the process of the push-pull rod 906 driving the base plate 2 905 and the turntable 2 904 to move down, the turntable 2 904 slides with the strip groove 915. When a certain amount of mother liquor enters the cooling cylinder 901, the push-pull rod 906 stops moving, and the motor 913 drives the turntable 1 903 to rotate, so that the turntable 1 903 blocks the base plate 1 902, thus isolating the mother liquor inside the cooling cylinder 901 from the outside. Step S4: The mother liquor inside the cooling cylinder 901 is cooled by the liquid cooling radiator 10. After the temperature drops to room temperature, the push-pull rod 906 continues to drive the base plate 905 and the turntable 904 to move. The turntable 904 slides with the spiral groove 916, causing the turntable 904 to rotate, so that the through hole on the turntable 904 coincides with the base plate 905. At this time, the mother liquor inside the cooling cylinder 901 enters the test tube 907 through the turntable 904 and the base plate 905. The potassium perchlorate concentration in the mother liquor is tested by the detector 908. Step S5: When the potassium perchlorate concentration in the mother liquor is below 8.2%, evaporation needs to continue. In this invention, cylinder 801 drives test stage 911 to move upward via push rod 802. Test stage 911 first moves along push rod 906, and test tube 907 is compressed. The liquid inside test tube 907 is forced into cooling cylinder 901 to empty test tube 907 and avoid residual test liquid inside test tube 907, which would affect the accuracy of the next set of measurements. Step S6: As the test bench 911 moves, the test bench 911 drives the push-pull rod 906 to move through the top plate 909. As the push-pull rod 906 moves upward, the turntable 904 cooperates with the strip groove 915, so that the turntable 904 blocks the base plate 905. At the same time, the motor 913 drives the turntable 903 to rotate, so that the through hole on the base plate 902 is opened. At this time, the push-pull rod 906 pushes the mother liquor inside the cooling cylinder 901 outward through the base plate 905 and the turntable 904. Step S7: Repeat the above operation and continuously test the concentration of potassium perchlorate in the mother liquor. When the concentration is within the range of 8.2% to 11.3%, the mother liquor is passed into the separator to separate the sodium chloride crystals in the mother liquor. Then, the separated mother liquor is passed into the cooling equipment to cool and crystallize the potassium perchlorate in the mother liquor. The potassium perchlorate is then recovered through the separator.

[0050] The implementation principle of this invention is as follows: First, the potassium perchlorate waste brine needs to be filtered to obtain mother liquor. The mother liquor is then added to evaporator 1 through gas-liquid inlet / outlet pipe 4. The high-temperature evaporation component 3 is started, which heats the mother liquor inside evaporator 1, causing the mother liquor to evaporate at high temperature and precipitate sodium chloride. The sodium chloride crystals precipitate and fall onto baffle 6.

[0051] When it is necessary to measure the concentration of potassium perchlorate in the mother liquor, the cylinder 801 drives the test platform 911 to move down through the push rod 802, and the test tube 907 extends. At the same time, the test platform 911 drives the push-pull rod 906 to move down through the base plate 910. The push-pull rod 906 drives the base plate 2 905 and the turntable 2 904 to move down synchronously. Then, the motor 913 drives the turntable 1 903 to rotate, so that the through hole on the turntable 1 903 coincides with the base plate 1 902. At this time, the mother liquor inside the evaporator 1 enters the cooling cylinder 901.

[0052] As the push-pull rod 906 moves the base plate 2 905 and the turntable 2 904 downwards, the turntable 2 904 slides into the strip groove 915. At this time, the turntable 2 904 blocks the through hole on the base plate 2 905, and the mother liquor is located between the turntable 2 904 and the turntable 1 903. After a certain amount of mother liquor enters the cooling cylinder 901, the push-pull rod 906 stops moving, and the motor 913 drives the turntable 1 903 to rotate, causing the turntable 1 903 to block the base plate 1 902. The liquid-cooled radiator 10 cools the mother liquor inside the cooling cylinder 901 by isolating the mother liquor inside the cooling cylinder 901 from the outside world. The method accelerates the cooling of the mother liquor. After the temperature drops to room temperature, the push-pull rod 906 continues to move the base plate 905 and the turntable 904. Through the sliding engagement of the turntable 904 and the spiral groove 916, the turntable 904 rotates, causing the through hole on the turntable 904 to coincide with the base plate 905. At this time, the mother liquor inside the cooling cylinder 901 enters the test tube 907 through the turntable 904 and the base plate 905. The concentration of potassium perchlorate in the mother liquor is measured by the detector 908, which improves the concentration calculation accuracy of the detector 908 while avoiding thermal drift of the detector 908. The reason for sending the mother liquor inside the cooling cylinder 901 into the test tube 907 before testing is to prevent the mother liquor inside the cooling cylinder 901 from becoming too cold, which would affect the measurement of the detector 908.

[0053] When the potassium perchlorate concentration in the mother liquor is below 8.2%, evaporation needs to continue. In this invention, cylinder 801 moves test platform 911 upward via push rod 802. Test platform 911 first moves along push-pull rod 906, compressing test tube 907. The liquid inside test tube 907 is forced into cooling cylinder 901, emptying test tube 907 and preventing residual test liquid from affecting subsequent measurements. As test platform 911 moves, it moves push-pull rod 906 via top plate 909. As push-pull rod 906 moves upward, turntable 904 engages with strip-shaped groove 915, sealing base plate 905. Simultaneously, motor 913 drives turntable 903 to rotate, opening the through hole on base plate 902. At this time, push-pull rod 906 pushes the mother liquor outward through base plate 905 and turntable 904.

[0054] Repeat the above operation and continuously test the concentration of potassium perchlorate in the mother liquor. When the concentration is within the range of 8.2% to 11.3%, the mother liquor is passed into a separator to separate the sodium chloride crystals from the mother liquor. Then, the separated mother liquor is passed into a cooling device to cool and crystallize the potassium perchlorate in the mother liquor. The potassium perchlorate is then recovered through the separator.

[0055] It should be noted that after the mother liquor enters the cooling cylinder 901, the total amount of mother liquor inside the evaporator 1 decreases, the liquid level drops accordingly, the distance between the high-temperature evaporation component 3 and the mother liquor increases, the heating effect of the high-temperature evaporation component 3 on the mother liquor decreases, which affects the evaporation of the mother liquor to a certain extent and leads to a decrease in recovery efficiency.

[0056] Before the cylinder 801 drives the test platform 911 to move downward, the electromagnetic chuck 806 attracts the magnetic block 805. At this time, the active rack 809 on the transverse rod 804 meshes with the driven rack 812 on one side through the gear 811. When the cylinder 801 drives the test platform 911 to move downward, the test platform 911 drives the transverse rod 804 and the active rack 809 to move synchronously. At this time, the active rack 809 drives the driven rack 812 and the baffle 6 to move upward through the gear 811. The baffle 6 lifts the mother liquor inside the evaporator 1, maintains the mother liquor level, and ensures the heating effect of the high-temperature evaporation component 3 on the mother liquor.

[0057] It should be noted that since the detector 908 requires a certain amount of time to measure the concentration of potassium perchlorate in the mother liquor, the evaporation time of the mother liquor increases during this process, and the liquid level will decrease accordingly. In order to ensure that the liquid level of the mother liquor remains unchanged after the measurement is completed, the detector 908 is used to measure the concentration of potassium perchlorate in the mother liquor.

[0058] When the cylinder 801 of this invention moves the test platform 911 upward, the mother liquor inside the cooling cylinder 901 is sent into the evaporator 1. At the same time, the second electromagnetic chuck 806 is de-energized, and the first electromagnetic chuck 807 is energized to attract the magnetic block 805. The active rack 808 on the transverse rod 804 meshes with the driven rack 812 on the other side through the reduction gear group 810. As the test platform 911 moves upward, the test platform 911 drives the baffle 6 to descend through the transverse rod 804 and the active rack 808. With the cooperation of the active rack 808, the reduction gear group 810 and the driven rack 812, after the push rod 802 is reset, the current position of the baffle 6 is higher than the original position of the baffle 6, thereby compensating for the evaporation of the mother liquor during the measurement process, keeping the mother liquor level consistent before and after the measurement, and avoiding the influence of measuring the potassium perchlorate concentration on the heating of the mother liquor.

[0059] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An apparatus for recovering potassium perchlorate from potassium perchlorate waste brine, characterized in that: The evaporator includes an evaporator (1), a high-temperature evaporation assembly (3) is installed on the top of the evaporator (1), a gas-liquid inlet / outlet pipe (4) and a drain pipe (5) are installed on the evaporator (1) respectively, a movable baffle (6) is installed inside the evaporator (1), a transmission assembly (8) is installed at the bottom of the evaporator (1), the transmission assembly (8) is connected to a concentration testing assembly (9), the concentration testing assembly (9) includes a cooling cylinder (901), a base plate (902) is fixedly installed inside the cooling cylinder (901), a turntable (903) is rotatably installed inside the cooling cylinder (901), the turntable (903) rotates to block the base plate (902), and a liquid-cooled radiator (10) is installed on the outer wall of the cooling cylinder (901). The transmission assembly (8) includes a cylinder (801), the output end of the cylinder (801) is connected to a push rod (802), a test bench (911) is installed on the push rod (802), a detector (908) is installed inside the test bench (911), the detector (908) is connected to a top plate (909), the top plate (909) is connected to the bottom of the cooling cylinder (901), a push-pull rod (906) is slidably installed inside the cooling cylinder (901), the push-pull rod (906) is slidably connected to the test bench (911), a base plate two (905) is installed on the push-pull rod (906), a turntable two (904) is rotatably installed on the base plate two (905), the turntable two (904) rotates to block the base plate two (905), a top plate (909) and a bottom plate (910) are respectively installed on the push-pull rod (906), and the test bench (911) slides between the top plate (909) and the bottom plate (910). When the cylinder (801) moves the test platform (911) downward via the push rod (802), the test platform (911) moves the push-pull rod (906) via the base plate (910), and the test tube (907) expands; when the cylinder (801) moves the test platform (911) upward via the push rod (802), the test platform (911) moves the push-pull rod (906) via the top plate (909), and the test tube (907) compresses.

2. The apparatus for recovering potassium perchlorate from potassium perchlorate waste brine according to claim 1, characterized in that: An annular disk (11) is installed at the bottom of the evaporator (1), and a liquid-cooled radiator (10) is fixedly installed on the annular disk (11).

3. The apparatus for recovering potassium perchlorate from potassium perchlorate waste brine according to claim 1, characterized in that: The push-pull rod (906) has an internal sliding groove (912) which slides with the slide block. A motor (913) is installed on the slide block. The motor (913) is connected to the turntable (903) through a rotating shaft (914). The motor (913) drives the turntable (903) to rotate.

4. The apparatus for recovering potassium perchlorate from potassium perchlorate waste brine according to claim 1, characterized in that: The inner wall of the cooling cylinder (901) is provided with a strip groove (915), and the bottom of the inner wall of the cooling cylinder (901) is provided with a spiral groove (916). The strip groove (915) and the spiral groove (916) are connected. The turntable (904) slides and slides in cooperation with the strip groove (915) and the spiral groove (916).

5. The apparatus for recovering potassium perchlorate from potassium perchlorate waste brine according to claim 1, characterized in that: The test bench (911) has a transverse slide groove (803) at the bottom. A transverse rod (804) is slidably installed inside the transverse slide groove (803). A first active rack (808) and a second active rack (809) are installed at both ends of the transverse rod (804). A magnetic block (805) is installed on the transverse rod (804). An electromagnetic chuck (806) and an electromagnetic chuck (807) are installed on the two side walls of the transverse slide groove (803). Guide rods (813) are installed on both sides of the bottom of the baffle (6). The guide rods (813) slide with the annular disk (11). A driven rack (812) is installed at the bottom of the guide rod (813). One driven rack (812) meshes with the gear (811), and the other driven rack (812) meshes with the deceleration gear set (810). When the push rod (802) moves down, the electromagnetic chuck one (807) attracts the magnetic block (805), and the active rack one (808) on the transverse rod (804) meshes with the deceleration gear set (810). When the push rod (802) moves up, the electromagnetic chuck two (806) attracts the magnetic block (805), and the active rack two (809) on the transverse rod (804) meshes with the gear (811).

6. The apparatus for recovering potassium perchlorate from potassium perchlorate waste brine according to claim 1, characterized in that: The evaporator (1) is equipped with a base (2) at the bottom; the high-temperature evaporation assembly (3) includes a hot air blower (301) installed on the top of the evaporator (1), the hot air blower (301) is connected to a gas plate (303) through a connecting pipe (302), and the gas plate (303) is located inside the evaporator (1).

7. The apparatus for recovering potassium perchlorate from potassium perchlorate waste brine according to claim 1, characterized in that: The evaporator (1) has an elastic telescopic head (7) installed on its inner wall, and a baffle (6) is inserted between the elastic telescopic heads (7).

8. A process for recovering potassium perchlorate from potassium perchlorate waste brine, characterized in that, The process is applied to the apparatus for recovering potassium perchlorate from potassium perchlorate waste brine as described in any one of claims 1-7 above, and the process includes the following steps: Step S1: First, the potassium perchlorate waste brine needs to be filtered to obtain mother liquor. The mother liquor is added to the evaporator (1) through the gas-liquid inlet / outlet pipe (4). The high-temperature evaporation component (3) is started. The high-temperature evaporation component (3) heats the mother liquor inside the evaporator (1) to promote the high-temperature evaporation of the mother liquor and the precipitation of sodium chloride. Step S2: When it is necessary to measure the concentration of potassium perchlorate in the mother liquor, the cylinder (801) drives the test platform (911) to move down through the push rod (802), and the test tube (907) extends. At the same time, the test platform (911) drives the push-pull rod (906) to move down through the base plate (910). The push-pull rod (906) drives the base plate two (905) and the turntable two (904) to move down synchronously. Then, the motor (913) drives the turntable one (903) to rotate, so that the through hole on the turntable one (903) coincides with the base plate one (902). At this time, the mother liquor inside the evaporator (1) enters the cooling cylinder (901). Step S3: During the process of the push-pull rod (906) driving the base plate two (905) and the turntable two (904) to move down, the turntable two (904) slides with the strip groove (915). When a certain amount of mother liquor enters the cooling cylinder (901), the push-pull rod (906) stops moving, and the motor (913) drives the turntable one (903) to rotate, so that the turntable one (903) blocks the base plate one (902) and isolates the mother liquor inside the cooling cylinder (901) from the outside. Step S4: The mother liquor inside the cooling cylinder (901) is cooled by the liquid cooling radiator (10). After the temperature drops to room temperature, the push-pull rod (906) continues to drive the base plate two (905) and the turntable two (904) to move. The turntable two (904) slides with the spiral groove (916) to make the turntable two (904) rotate, so that the through hole on the turntable two (904) coincides with the base plate two (905). At this time, the mother liquor inside the cooling cylinder (901) enters the test tube (907) through the turntable two (904) and the base plate two (905). The potassium perchlorate concentration in the mother liquor is tested by the detector (908). Step S5: When the concentration of potassium perchlorate in the mother liquor is lower than 8.2%, evaporation needs to continue. The cylinder (801) of this invention drives the test platform (911) to move upward through the push rod (802). The test platform (911) first moves along the push-pull rod (906), and the test tube (907) is compressed. The liquid inside the test tube (907) is forced into the cooling cylinder (901) to empty the test tube (907) and avoid residual test liquid inside the test tube (907), which would affect the accuracy of the next set of measurements. Step S6: As the test bench (911) moves, the test bench (911) drives the push-pull rod (906) to move through the top plate (909). As the push-pull rod (906) moves upward, the turntable two (904) cooperates with the strip groove (915) to block the base plate two (905). At the same time, the motor (913) drives the turntable one (903) to rotate, so that the through hole on the base plate one (902) is opened. At this time, the push-pull rod (906) pushes the mother liquor inside the cooling cylinder (901) outward through the base plate two (905) and the turntable two (904). Step S7: Repeat the above operation and continuously test the concentration of potassium perchlorate in the mother liquor. When the concentration is within the range of 8.2% to 11.3%, the mother liquor is passed into the separator to separate the sodium chloride crystals in the mother liquor. Then, the separated mother liquor is passed into the cooling equipment to cool and crystallize the potassium perchlorate in the mother liquor. The potassium perchlorate is then recovered through the separator.

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