Sulfuric acid method treatment device and method for hydrochloric acid desorption

Abstract

The invention relates to the technical field of waste liquid treatment, in particular to a sulfuric acid method treatment device and method for hydrochloric acid resolution. The device comprises an assembly base, and a power distribution control cabinet and a heat supply assembly are assembled on the rear side of the surface of the assembly base; an analysis tank and a purification tank are supported and assembled on the front side surface of the assembly seat through a high bracket and a low bracket respectively, a middle filter assembly is arranged between the analysis tank and the purification tank in a communicating manner, and the lower part of the middle filter assembly is supported and assembled on the upper part of the right side of the high bracket through a suspension bracket; the method further comprises the following steps: S1, waste liquid pretreatment; s2, mixing; s3, heating and stirring; s4, demisting, drying, liquefying, discharging, detecting and storing; s5, transferring and filtering; s6, recycling is conducted; and S7, detecting. Through the corresponding technological process and device arrangement, hydrochloric acid is conveniently separated and purified through concentrated sulfuric acid analysis, meanwhile, auxiliary filtration and evaporation purification are conveniently carried out on subsequent analysis dilute sulfuric acid waste liquid, recycling and reusing are facilitated, meanwhile, waste liquid treatment is also facilitated, and waste is not likely to be caused.

Description

Technical Field

[0001] This invention relates to the field of waste liquid treatment technology, specifically to a sulfuric acid treatment apparatus and method for hydrochloric acid desorption. Background Technology

[0002] In the current industrial development process, the output of industrial by-product hydrochloric acid is continuously increasing. How to effectively recycle and utilize waste hydrochloric acid has become a key common problem faced by many enterprises, which seriously restricts their further development. Producing hydrogen chloride through the desorption of waste hydrochloric acid and using it for resource utilization is a highly promising approach. It can significantly reduce the production costs of related industries. Currently, common waste hydrochloric acid desorption processes include the calcium chloride method, the pressure difference method, and the sulfuric acid method. The sulfuric acid method utilizes the strong hygroscopic properties of concentrated sulfuric acid to achieve hydrogen chloride desorption, which not only has the advantages of good operational safety but also lower operating costs, giving it a certain advantage among many processes.

[0003] For example, patent application CN202322199040.0 discloses a sulfuric acid hydrochloric acid analysis device, including a fixed box, a feed pipe fixedly connected to one side of the fixed box, a discharge pipe fixedly connected to the other side of the fixed box, a fixed cylinder fixedly connected to the inner wall of the fixed box, a movable shaft movably connected to the inner wall of the fixed box, a support rod fixedly connected to the outer wall of the movable shaft, a cleaning block fixedly connected to one side of the support rod, and the feed pipe having a "T" shaped structure when viewed from the front.

[0004] Existing hydrochloric acid analysis devices are inconvenient for assisting and co-processing waste liquid during analysis and for recycling, which easily leads to waste and affects the efficiency and effectiveness of operation. Therefore, there is an urgent need to design a sulfuric acid treatment device and method for hydrochloric acid analysis to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a sulfuric acid treatment apparatus and method for hydrochloric acid desorption, in order to solve the problems mentioned in the background art: existing desorption devices are inconvenient to assist and coordinate the treatment of waste liquid and its recycling during desorption, which easily leads to waste and affects the efficiency and effectiveness of use.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sulfuric acid treatment device and method for hydrochloric acid desorption, comprising an assembly base, wherein a power distribution control cabinet and a heating component are assembled on the rear side of the surface of the assembly base;

[0007] The front surface of the mounting base is supported by a high bracket and a low bracket respectively for mounting a desorption tank and a purification tank. A middle filter assembly is provided between the desorption tank and the purification tank, and the lower part of the middle filter assembly is mounted on the upper right side of the high bracket by a suspension bracket.

[0008] It also includes the following steps:

[0009] S1-1: Waste liquid pretreatment, which involves physical filtration of the waste liquid;

[0010] S1-2: Waste liquid pretreatment, chemical filtration of waste liquid;

[0011] S2: Mixing, adding the pretreated and filtered hydrochloric acid and concentrated sulfuric acid into the desorption tank;

[0012] S3-1: Heating, indirect heating is carried out inside the desorption vessel;

[0013] S3-2: Stirring, which is carried out while heating inside the desorption tank;

[0014] S4-1: Demisting and drying, HCl steam is introduced into the demister and drying tower for drying;

[0015] S4-2: Liquefaction discharge, the dried HCl gas is introduced into the condensation unit for condensation and liquefaction;

[0016] S4-3: Testing and storage: Store the liquefied HCl solution after verifying that its concentration and purity are within acceptable limits.

[0017] S5: Transfer filtration, which transports the desorbed sulfuric acid waste liquid to the internal filter assembly for transfer filtration;

[0018] S6: Recycling, the filtered sulfuric acid waste liquid is introduced into the purification tank for successive heating, stirring and evaporation to remove water vapor;

[0019] S7: Testing. If the concentration of the concentrated sulfuric acid solution is qualified, it will be recycled and stored or reused to analyze the waste hydrochloric acid solution. If it is not qualified, it will be purified by heating.

[0020] As a further step of this solution, specifically, when indirect heating is carried out inside the desorption tank, the temperature is controlled and maintained between 110-130℃ by the heating component, and when indirect heating is carried out inside the purification tank, the temperature is controlled and maintained between 150-180℃ by the heating component.

[0021] As a further step in this solution, a hollow convex cylinder is integrally formed in the center of the analytical tank, and a coil is fitted around the outside of the convex cylinder. A stirring component is fitted inside the coil, and a scraping component is provided on the inner wall of the analytical tank and the side wall of the convex cylinder. A drive shaft is installed inside the convex cylinder through a bearing. Similarly, a convex cylinder is integrally formed inside the purification tank, and a coil is fitted around the outside of the convex cylinder. A stirring component is fitted inside the coil, and a scraping component is provided on the inner wall of the purification tank and the side wall of the convex cylinder. A drive shaft is installed inside the convex cylinder through a bearing. The bottoms of the drive shaft and the drive shaft are driven by a drive assembly. Both the coil and the coil are connected to the heating assembly through pipes.

[0022] As a further step of this solution, the drive component includes a servo motor, the output end of which is equipped with a reducer, and the upper part of the reducer output end is connected to the lower end of the drive shaft via a coupling for transmission. The lower part of the reducer output end is connected to a transmission rod via a coupling, and the lower end of the transmission rod is fixed with a transmission wheel. The lower end of the drive shaft is provided with a driven wheel that is horizontally aligned with the transmission wheel, and the transmission wheel and the driven wheel are connected for transmission via a belt.

[0023] As a further step of this solution, the lower end of the drive shaft is mounted on the upper part of the high bracket through a bearing, and the lower end of the second drive shaft is mounted on the upper part of the low bracket through a bearing. The drive assembly is supported and mounted inside the high bracket, and the upper and lower ends of the transmission rod are supported and mounted in the middle of the high bracket through a bearing bracket.

[0024] As a further step of this solution, a sealing element 1 is filled between the upper inner wall of the first convex cylinder and the upper outer wall of the first drive shaft, and the sealing element is fitted onto the upper outer wall of the first drive shaft. A sealing element 2 is filled between the upper inner wall of the second convex cylinder and the upper outer wall of the second drive shaft, and the sealing element 2 is fitted onto the upper outer wall of the second drive shaft. Both the first convex cylinder and the second convex cylinder are conical in shape.

[0025] As a further step of this solution, the upper end of the first drive shaft is fastened to the top of the first agitator and the center of the top of the first scraper by bolts, and the upper end of the second drive shaft is also fastened to the top of the second agitator and the center of the top of the second scraper by bolts. Three sets of agitators are evenly distributed on one side wall of the agitator, and the outer wall of the first scraper is attached to the inner wall of the analytical tank, and the inner wall of the first scraper is attached to the surface of the first convex cylinder. The second agitator and the second scraper are also equipped with the same configuration.

[0026] As a further improvement of this solution, the top of the analysis tank is equipped with a gas outlet, and the top of the purification tank is also equipped with a steam outlet. The intermediate filter assembly includes a transfer chamber, and the top of the transfer chamber is equipped with a chamber cover. The bottom right side of the analysis tank is connected to the upper left side of the transfer chamber via a liquid-lowering solenoid valve, and the bottom right side of the transfer chamber is connected to the upper left side of the purification tank via a liquid-inlet solenoid valve. The bottom right side of the purification tank is correspondingly equipped with a liquid-draining solenoid valve. The top sides of the analysis tank and the purification tank are respectively equipped with feed solenoid valves, and the top sides of the analysis tank and the purification tank are also correspondingly equipped with pressure gauges, temperature gauges, and reserved ports.

[0027] As a further step in this solution, a filter screen is installed at the bottom inside the transfer compartment, and a surrounding plate is integrally provided on the side of the filter screen.

[0028] As a further step of this solution, the first coil is arranged in a spiral shape from top to bottom, and the lower end of the first coil is folded back upwards to be flush with the upper end of the first coil. The first coil is inserted and assembled on the upper rear side of the side wall of the analysis tank. The second coil is also inserted and assembled on the upper rear side of the side wall of the purification tank. The heating component includes a mold temperature controller, which is connected to the first and second coils respectively through the first and second metal tube groups. The outer walls of the first and second metal tube groups are wrapped with heat insulation cotton.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] 1. The sulfuric acid treatment device and method for hydrochloric acid desorption, through the corresponding process flow setting, facilitates the preliminary pretreatment and filtration of waste liquid, and the separation and purification of hydrochloric acid by desorption with concentrated sulfuric acid. At the same time, it facilitates the auxiliary filtration and evaporation purification of the subsequent dilute sulfuric acid waste liquid, which is easy to recycle and reuse. It is also easy to treat waste liquid and does not easily cause waste, which is beneficial to hydrochloric acid desorption and waste liquid treatment.

[0031] 2. The sulfuric acid treatment device and method for hydrochloric acid desorption utilizes a drive assembly with a transmission rod to synchronously rotate the stirring and scraping components inside the desorption and purification tanks. This facilitates uniform mixing and heating, making the mixing and heating operations more convenient and efficient. It also facilitates scraping the inner wall of the tank with the scraping components, reducing the likelihood of residue buildup and making subsequent drainage operations more convenient and efficient. This benefits hydrochloric acid desorption and waste liquid treatment.

[0032] 3. The sulfuric acid treatment device and method for hydrochloric acid desorption facilitates the gradual mixing, heating, evaporation, and purification of pretreated hydrochloric acid waste liquid through the desorption tank, purification tank, and intermediate filter assembly. Simultaneously, the intermediate filter assembly facilitates the transfer and filtration of the desorbed sulfuric acid waste liquid. Subsequently, with the assistance of the purification tank, the dilute sulfuric acid is gradually evaporated, concentrated, and purified, which is beneficial for the treatment and recycling of waste liquid and minimizes waste. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the process flow of the method of the present invention;

[0034] Figure 2 This is a frontal three-dimensional schematic diagram of the structure of the present invention;

[0035] Figure 3 This is a rear-view perspective view of the structure of the present invention;

[0036] Figure 4 This is a bottom-view perspective view of a partial structure of the linkage component of the present invention;

[0037] Figure 5 This is a three-dimensional cross-sectional schematic diagram of a partial structure of the analytical vessel of the present invention;

[0038] Figure 6 This is a three-dimensional side view sectional view of a partial structure of the purification tank of the present invention;

[0039] Figure 7 This is a three-dimensional cross-sectional view of a partial structure of the filter assembly in this invention;

[0040] Figure 8 This is a frontal three-dimensional exploded view of a partial structure of the coil, stirring component, and scraping component of the present invention.

[0041] In the diagram: 100, Assembly base; 110, Power distribution control cabinet; 120, High support; 130, Low support; 140, Suspension support; 200, Desorption tank; 201, Gas outlet; 202, Liquid discharge solenoid valve; 203, Feed solenoid valve; 204, Pressure gauge; 205, Thermometer; 206, Reserved port; 210, Convex cylinder one; 220, Coil one; 230, Agitator one; 231, Agitator rod; 240, Scraper one; 250, Drive shaft one; 251, Seal one; 300, Purification tank; 301, Steam outlet; 302, Drain solenoid valve; 303, Inlet solenoid valve 310. Convex cylinder II; 320. Coil II; 330. Agitator II; 340. Scraper II; 350. Drive shaft II; 351. Seal II; 400. Intermediate filter assembly; 410. Transfer chamber; 411. Chamber cover; 420. Filter screen; 421. Enclosure plate; 500. Drive assembly; 510. Servo motor; 520. Reducer; 530. Transmission rod; 531. With bearing bracket; 540. Transmission wheel; 550. Driven wheel; 560. Belt; 600. Heating assembly; 610. Mold temperature controller; 620. Metal pipe assembly I; 630. Metal pipe assembly II. Detailed Implementation

[0042] 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.

[0043] Please see Figures 1-8 One embodiment provided by the present invention:

[0044] A sulfuric acid treatment apparatus and method for hydrochloric acid desorption are disclosed in this application. The power distribution control cabinet 110, servo motor 510, reducer 520, mold temperature controller 610, and the liquid discharge solenoid valve 202, feed solenoid valve 203, drain solenoid valve 302 and inlet solenoid valve 303 used in this application are all commercially available products. Their operating principles and connection methods are existing technologies well known to those skilled in the art, and therefore will not be described in detail here. The apparatus includes an assembly base 100, on which the power distribution control cabinet 110 and heating component 600 are mounted on the rear side of the surface.

[0045] The front surface of the mounting base 100 is supported by the high bracket 120 and the low bracket 130 respectively for mounting the analysis tank 200 and the purification tank 300. The analysis tank 200 and the purification tank 300 are connected by a middle filter assembly 400, and the lower part of the middle filter assembly 400 is supported by the suspension bracket 140 and mounted on the upper right side of the high bracket 120.

[0046] It also includes the following steps:

[0047] S1-1: Waste liquid pretreatment, physical filtration of waste liquid: coarse filtration and fine filtration through components such as filter press and ceramic membrane filter;

[0048] S1-2: Waste liquid pretreatment, chemical filtration of waste liquid: pH value is adjusted by adding appropriate reagents to make heavy metal ions precipitate, and the concentration is adjusted to below 31% as needed to improve the efficiency of subsequent analysis;

[0049] S2: Mixing, the pretreated and filtered hydrochloric acid and concentrated sulfuric acid are added into the desorption tank 200;

[0050] S3-1: Heating, indirect heating is carried out inside the desorption tank 200; when indirect heating is carried out inside the desorption tank 200, the temperature is controlled by the heating component 600 to maintain it between 110-130℃, which is lower than the boiling point of sulfuric acid and higher than the boiling point of hydrochloric acid, so as to facilitate the desorption, evaporation and purification of hydrochloric acid.

[0051] S3-2: Stirring, while heating inside the analytical tank 200, to make the mixing and heating more uniform;

[0052] S4-1: Demisting and drying, HCl vapor is introduced into the demister and drying tower for drying, which facilitates subsequent condensation;

[0053] S4-2: Liquefaction discharge, the dried HCl gas is introduced into the condensation unit for condensation and liquefaction;

[0054] S4-3: Testing and storage: Store the liquefied HCl solution after verifying that its concentration and purity are within acceptable limits.

[0055] S5: Transfer filtration, which transports the desorbed sulfuric acid waste liquid to the intermediate filter component 400 for transfer filtration, so as to facilitate the subsequent concentration, purification and recycling of sulfuric acid waste liquid;

[0056] S6: Recycling, the filtered sulfuric acid waste liquid is introduced into the purification tank 300 for successive heating, stirring and evaporation to remove water vapor. When indirect heating is carried out inside the purification tank 300, the temperature is controlled by the heating component 600 to maintain it between 150-180℃, and the secondary evaporation temperature is controlled between 120-150℃.

[0057] S7: Testing. If the concentration of the concentrated sulfuric acid solution is qualified, it will be recycled and stored or reused to analyze the waste hydrochloric acid solution. If it is not qualified, it will be purified by heating.

[0058] As described in more detail in this embodiment, a hollow convex cylinder 210 is integrally formed in the center of the analytical tank 200, and a coil 220 is fitted around the outside of the convex cylinder 210. A stirring element 230 is fitted inside the coil 220, and scraping elements 240 are provided on the inner wall of the analytical tank 200 and the side wall surface of the convex cylinder 210. A drive shaft 250 is installed inside the convex cylinder 210 via bearings. Similarly, a second convex cylinder 310 is integrally formed inside the purification tank 300. The outer side of the convex cylinder 310 is fitted with a coil 320, and the inner side of the coil 320 is fitted with a stirring component 330. The inner wall of the purification tank 300 and the side wall of the convex cylinder 310 are provided with a scraping component 340. The inner side of the convex cylinder 310 is fitted with a drive shaft 350 through a bearing. The bottom of the drive shaft 250 and the drive shaft 350 are driven by the drive assembly 500. The coil 220 and the coil 320 are both connected to the heating assembly 600 through pipes.

[0059] This facilitates auxiliary heating and evaporation of the treated hydrochloric acid waste liquid and evaporation and concentration of the sulfuric acid waste liquid, making operation and use more convenient.

[0060] As described in more detail in this embodiment, the drive assembly 500 includes a servo motor 510, a reducer 520 is mounted on the output end of the servo motor 510, and the upper part of the output end of the reducer 520 is connected to the lower end of the drive shaft 250 via a coupling for transmission. The lower part of the output end of the reducer 520 is connected to a transmission rod 530 via a coupling. A transmission wheel 540 is fixedly mounted on the lower end of the transmission rod 530, and a driven wheel 550 is provided on the lower end of the drive shaft 350, which is horizontally aligned with the transmission wheel 540. The transmission wheel 540 and the driven wheel 550 are connected for transmission via a belt 560.

[0061] Therefore, during assembly and use, drive shaft 250 and drive shaft 350 are driven to rotate synchronously, so that the components inside the subsequent analysis tank 200 and purification tank 300 rotate synchronously, making subsequent operations more convenient.

[0062] As described in more detail in this embodiment, the lower end of drive shaft 250 is mounted on the upper part of high bracket 120 by means of bearing insertion, and the lower end of drive shaft 350 is mounted on the upper part of low bracket 130 by means of bearing insertion, and drive assembly 500 is supported and mounted inside high bracket 120, and the upper and lower ends of transmission rod 530 are supported and mounted in the middle of high bracket 120 by means of bearing bracket 531.

[0063] Therefore, during assembly and use, it is easy to provide auxiliary and stable support, making subsequent transmission more convenient and efficient.

[0064] As described in more detail in this embodiment, a seal 251 is filled between the upper inner wall of the first convex cylinder 210 and the upper outer wall of the first drive shaft 250, and the seal 251 is sleeved and assembled on the upper outer wall of the first drive shaft 250. A seal 351 is filled between the upper inner wall of the second convex cylinder 310 and the upper outer wall of the second drive shaft 350, and the seal 351 is sleeved and assembled on the upper outer wall of the second drive shaft 350. Both the first convex cylinder 210 and the second convex cylinder 310 are conical in shape.

[0065] This facilitates the stable insertion and relatively sealed assembly of drive shaft 250 and drive shaft 350, making subsequent use more convenient.

[0066] As described in more detail in this embodiment, the top of the analysis tank 200 is equipped with a gas outlet 201, and the top of the purification tank 300 is also provided with a steam outlet 301. The intermediate filter assembly 400 includes a transfer chamber 410, and the top of the transfer chamber 410 is equipped with a chamber cover 411. The bottom right side of the analysis tank 200 is connected to the upper left side of the transfer chamber 410 through a liquid discharge solenoid valve 202, and the bottom right side of the transfer chamber 410 is connected to the upper left side of the purification tank 300 through a liquid inlet solenoid valve 303. The bottom right side of the purification tank 300 is correspondingly equipped with a liquid discharge solenoid valve 302. The top sides of the analysis tank 200 and the purification tank 300 are respectively equipped with feed solenoid valves 203, and the top sides of the analysis tank 200 and the purification tank 300 are also correspondingly equipped with a pressure gauge 204, a temperature gauge 205, and a reserved port 206.

[0067] This facilitates the feeding and discharging of materials into the inner walls of the analysis tank 200 and the purification tank 300, and also facilitates the connection and connection between the analysis tank 200, the intermediate filter assembly 400, and the purification tank 300, making subsequent liquid discharge and filling as needed more convenient and easier to operate.

[0068] As described in more detail in this embodiment, a filter screen 420 is installed at the bottom inside the transfer compartment 410, and a surrounding plate 421 is integrally provided on the side of the filter screen 420.

[0069] Therefore, during assembly and use, it is convenient to perform auxiliary filtration in conjunction with the transfer chamber 410, and it is also convenient to disassemble and clean after a period of use.

[0070] As described in more detail in this embodiment, the upper end of the drive shaft 250 is fastened to the top of the agitator 230 and the center of the top of the scraper 240 by bolts, and the upper end of the drive shaft 350 is also fastened to the top of the agitator 330 and the center of the top of the scraper 340 by bolts. Three sets of agitators 231 are evenly distributed on the side wall of the agitator 230, and the outer wall of the scraper 240 is attached to the inner wall of the analytical tank 200, and the inner wall of the scraper 240 is attached to the surface of the convex cylinder 210. The agitator 330 and the scraper 340 are also assembled in the same manner.

[0071] Therefore, during assembly and use, it is convenient to perform auxiliary and uniform stirring and auxiliary scraping of the inner wall according to the needs of use, which makes it less likely to leave residues, making operation and use more convenient and efficient; at the same time, it is also easy to disassemble, clean and maintain.

[0072] As described in more detail in this embodiment, coil 220 is arranged in a spiral coiled shape from top to bottom, and the lower end of coil 220 is folded back upwards to be flush with the upper end of coil 220. Coil 220 is inserted and assembled on the upper rear side of the side wall of the analytical tank 200. Coil 320 is also inserted and assembled on the upper rear side of the side wall of the purification tank 300. The heating component 600 includes a mold temperature controller 610, and the mold temperature controller 610 is connected to coil 220 and coil 320 through metal tube assembly 620 and metal tube assembly 630 respectively. The outer walls of metal tube assembly 620 and metal tube assembly 630 are wrapped with heat insulation cotton.

[0073] This allows for indirect heating of coil 220 and coil 320 by supplying oil media of the corresponding temperature through the mold temperature controller 610 during use, making operation more convenient and efficient.

[0074] Working principle: When in use, the user first mixes the pretreated hydrochloric acid waste liquid and concentrated sulfuric acid in proportion and puts them into the desorption tank 200. The gas outlet 201 is connected to the demisting drying component and the condensing component, and the steam outlet 301 is connected to the condensing component and the emission component to facilitate condensation treatment during subsequent evaporation.

[0075] With the circuit connected, and in cooperation with the power distribution control cabinet 110, it is easy to control the opening and closing of the liquid solenoid valve 202, the feed solenoid valve 203, the liquid inlet solenoid valve 303, and the liquid outlet solenoid valve 302, as well as to control the operation of the servo motor 510. With the cooperation of the heating component 600, the oil medium of the corresponding temperature is supplied to the coil 220 through the metal pipe assembly 620 to indirectly heat the inside of the analysis tank 200, so that the mixed liquid inside the analysis tank 200 can be assisted to evaporate to form HCl vapor, which is convenient for the analysis of hydrochloric acid. Subsequently, the waste liquid after analysis is initially transferred and filtered with the cooperation of the intermediate filter assembly 400 and introduced into the purification tank 300. With the cooperation of the coil 320 and the mold temperature controller 610, heat of the corresponding temperature is supplied to evaporate the water in the dilute sulfuric acid waste liquid and concentrate it. After one round of evaporation and concentration, the corresponding solution is sampled for concentration detection, and the medium of the corresponding temperature is supplied for reheating and evaporation and concentration until the concentration quality is qualified, and then it can be discharged for storage or recycled for reuse.

[0076] During operation, the servo motor 510 and reducer 520 work together to output strong and stable power. With the help of the transmission rod 530, the drive shaft 250 and drive shaft 350 are driven to rotate synchronously. This drives the agitator 230, scraper 240, agitator 330, and scraper 340 to rotate in an auxiliary manner, stirring the liquid inside the desorption tank 200 and purification tank 300. This makes the mixing and heating more uniform, which is beneficial for subsequent heating and evaporation operations, making the operation more convenient and efficient.

[0077] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A sulfuric acid treatment apparatus and method for hydrochloric acid desorption, comprising an assembly base, wherein a power distribution control cabinet and a heating component are assembled on the rear side of the surface of the assembly base; Its features are: The front surface of the mounting base is supported by a high bracket and a low bracket respectively for mounting a desorption tank and a purification tank. A middle filter assembly is provided between the desorption tank and the purification tank, and the lower part of the middle filter assembly is mounted on the upper right side of the high bracket by a suspension bracket. It also includes the following steps: S1-1: Waste liquid pretreatment, which involves physical filtration of the waste liquid; S1-2: Waste liquid pretreatment, chemical filtration of waste liquid; S2: Mixing, adding the pretreated and filtered hydrochloric acid and concentrated sulfuric acid into the desorption tank; S3-1: Heating, indirect heating is carried out inside the desorption vessel; S3-2: Stirring, which is carried out while heating inside the desorption tank; S4-1: Demisting and drying, HCl steam is introduced into the demister and drying tower for drying; S4-2: Liquefaction discharge, the dried HCl gas is introduced into the condensation unit for condensation and liquefaction; S4-3: Testing and storage: Store the liquefied HCl solution after verifying that its concentration and purity are within acceptable limits. S5: Transfer filtration, which transports the desorbed sulfuric acid waste liquid to the internal filter assembly for transfer filtration; S6: Recycling, the filtered sulfuric acid waste liquid is introduced into the purification tank for successive heating, stirring and evaporation to remove water vapor; S7: Testing. If the concentration of the concentrated sulfuric acid solution is qualified, it will be recycled and stored or reused to analyze the waste hydrochloric acid solution. If it is not qualified, it will be purified by heating.

2. The apparatus and method for treating hydrochloric acid using the sulfuric acid process according to claim 1, characterized in that: Specifically, when indirect heating is carried out inside the desorption tank, the temperature is controlled and maintained between 110-130℃ through the heating components, and when indirect heating is carried out inside the purification tank, the temperature is controlled and maintained between 150-180℃ through the heating components.

3. The apparatus and method for treating hydrochloric acid using the sulfuric acid process according to claim 1, characterized in that: The analytical tank has a hollow convex cylinder integrally formed in the center, and a coil is fitted on the outside of the convex cylinder. A stirring component is fitted inside the coil, and a scraping component is provided on the inner wall of the analytical tank and the side wall of the convex cylinder. A drive shaft is installed inside the convex cylinder through a bearing. Similarly, the purification tank has a convex cylinder integrally formed inside, and a coil is fitted on the outside of the convex cylinder. A stirring component is fitted inside the coil, and a scraping component is provided on the inner wall of the purification tank and the side wall of the convex cylinder. A drive shaft is installed inside the convex cylinder through a bearing. The bottoms of the drive shaft and the drive shaft are driven by a drive assembly. Both the coil and the coil are connected to the heating assembly through pipes.

4. The apparatus and method for treating hydrochloric acid using the sulfuric acid process according to claim 3, characterized in that: The drive assembly includes a servo motor, the output end of which is equipped with a reducer. The upper part of the reducer output end is connected to the lower end of the drive shaft via a coupling. The lower part of the reducer output end is connected to a transmission rod via a coupling. The lower end of the transmission rod is fixed with a transmission wheel. The lower end of the drive shaft is provided with a driven wheel that is horizontally aligned with the transmission wheel. The transmission wheel and the driven wheel are connected by a belt.

5. The apparatus and method for treating hydrochloric acid using the sulfuric acid process according to claim 4, characterized in that: The lower end of the drive shaft is mounted on the upper part of the high bracket via a bearing, and the lower end of the second drive shaft is mounted on the upper part of the low bracket via a bearing. The drive assembly is supported and mounted inside the high bracket, and the upper and lower ends of the transmission rod are supported and mounted in the middle of the high bracket via bearing brackets.

6. The apparatus and method for treating hydrochloric acid using the sulfuric acid process according to claim 3, characterized in that: A first seal is filled between the upper inner wall of the first convex cylinder and the upper outer wall of the first drive shaft, and the seal is fitted onto the upper outer wall of the first drive shaft. A second seal is filled between the upper inner wall of the second convex cylinder and the upper outer wall of the second drive shaft, and the seal is fitted onto the upper outer wall of the second drive shaft. Both the first convex cylinder and the second convex cylinder are conical.

7. The apparatus and method for treating hydrochloric acid using the sulfuric acid process according to claim 3, characterized in that: The upper end of the first drive shaft is fastened to the top of the first agitator and the center of the top of the first scraper by bolts, and the upper end of the second drive shaft is also fastened to the top of the second agitator and the center of the top of the second scraper by bolts. Three sets of agitators are evenly distributed on one side wall of the agitator, and the outer wall of the first scraper is attached to the inner wall of the analytical tank, and the inner wall of the first scraper is attached to the surface of the first convex cylinder. The second agitator and the second scraper are also assembled in the same way.

8. The apparatus and method for treating hydrochloric acid using the sulfuric acid process according to claim 1, characterized in that: The top of the analysis tank is equipped with a gas outlet, and the top of the purification tank is also equipped with a steam outlet. The intermediate filter assembly includes a transfer chamber, and the top of the transfer chamber is equipped with a chamber cover. The bottom right side of the analysis tank is connected to the upper left side of the transfer chamber via a liquid-lowering solenoid valve, and the bottom right side of the transfer chamber is connected to the upper left side of the purification tank via a liquid-inlet solenoid valve. The bottom right side of the purification tank is equipped with a corresponding liquid-draining solenoid valve. The top sides of the analysis tank and the purification tank are respectively equipped with corresponding feed solenoid valves, and the top sides of the analysis tank and the purification tank are also equipped with corresponding pressure gauges, temperature gauges, and reserved ports.

9. The apparatus and method for treating hydrochloric acid using the sulfuric acid process according to claim 8, characterized in that: The transfer compartment is equipped with a filter screen at the bottom, and the filter screen is integrally surrounded by a ring plate.

10. The apparatus and method for treating hydrochloric acid using the sulfuric acid process according to claim 3, characterized in that: The first coil is arranged in a spiral shape from top to bottom, and the lower end of the first coil is folded back upwards to be flush with the upper end of the first coil. The first coil is inserted and assembled on the upper rear side of the side wall of the analysis tank. The second coil is also inserted and assembled on the upper rear side of the side wall of the purification tank. The heating component includes a mold temperature controller, which is connected to the first and second coils respectively through the first and second metal tube groups. The outer walls of the first and second metal tube groups are wrapped with heat insulation cotton.

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