Calcium-containing leachate solidification system and method

Abstract

The application discloses a kind of solidification system and solidification method of calcium-containing leaching liquor, and the solidification system of calcium-containing leaching liquor includes reactor, stirring assembly, liquid supply component, gas supply component and discharge assembly.Form vertical reaction cavity in reactor, top end is communicated with exhaust pipeline;Stirring assembly is located in reaction cavity, including vertical stirring shaft, stirring paddle structure on stirring shaft and bottom end gas supply paddle structure;Liquid supply component includes the liquid supply pipeline close to the top end of reaction cavity;Gas supply component includes the main gas supply pipeline close to the bottom end of reaction cavity, the auxiliary gas supply pipeline between liquid supply pipeline and main gas supply pipeline and the paddle gas supply pipeline communicated with gas supply paddle structure;Discharge assembly includes the discharge pipe communicated with the bottom end of reaction cavity and solid-liquid separation device.The application is mixed by multiple-point gas supply and stirring cooperation, and calcium-containing leaching liquor and carbon dioxide gas are uniformly mixed and fully reacted, improve the uniformity, stability and utilization rate of carbon dioxide and calcium-containing leaching liquor of wet carbonation reaction.

Description

Technical Field

[0001] This invention relates to the field of calcium carbonate preparation technology, and in particular to a curing system and method for calcium-containing leachate. Background Technology

[0002] Industrial processes such as thermal power, coal chemical, metallurgical, and building materials production generate large quantities of calcium-containing industrial solid waste, encompassing bulk solid wastes such as fly ash, gasification slag, desulfurization ash, smelting slag, calcium carbide slag, and calcium-containing tailings. Open-air storage of this type of solid waste occupies land and poses environmental risks such as dust and leachate pollution. The active calcium component in the solid waste can be dissolved through processes such as ammonium salt leaching, salt leaching, and weak acid leaching to prepare calcium-containing leachate. By reacting the calcium-containing leachate with carbon dioxide-containing industrial tail gas through a wet carbonation reaction to generate calcium carbonate, calcium carbonate can be generated, achieving both resource utilization of solid waste and permanent sealing of carbon dioxide waste gas in a mineral solidification form.

[0003] Currently, the wet carbonation reaction between calcium-containing leachate and carbon dioxide-containing industrial tail gas is uneven, easily leading to local oversaturation of the calcium-containing leachate or the instantaneous generation of a large number of ultrafine calcium carbonate crystals. This results in poor stability of the generated calcium carbonate and makes it difficult for the calcium-containing leachate and carbon dioxide to react completely. The utilization rate of carbon dioxide and calcium-containing leachate is low, resulting in a large consumption of calcium-containing leachate and carbon dioxide. Summary of the Invention

[0004] The main objective of this invention is to propose a curing system and method for calcium-containing leachate, aiming to solve the technical problems of uneven wet carbonation reaction between calcium-containing leachate and carbon dioxide-containing industrial tail gas, resulting in poor reaction stability and low utilization rates of carbon dioxide and calcium-containing leachate.

[0005] To achieve the above objectives, the present invention provides a curing system for calcium-containing leachate comprising: The reactor has a vertically arranged reaction chamber inside, and the top of the reaction chamber is connected to an exhaust pipe. The stirring assembly is located inside the reaction chamber. The stirring assembly includes a stirring shaft, a stirring blade structure, and an air supply blade structure. The stirring shaft is vertically arranged and can rotate around its own axis. The air supply blade structure is located at the bottom end of the stirring shaft. The stirring blade structure is located on the stirring shaft and above the air supply blade structure. The air supply blade structure can spray carbon dioxide gas. The liquid supply assembly includes a liquid supply line for supplying calcium-containing leachate, the liquid supply line being connected to the reaction chamber and disposed near the top of the reaction chamber; The gas supply assembly includes a main gas supply line, an auxiliary gas supply line, and a blade gas supply line for supplying carbon dioxide gas. Both the main gas supply line and the auxiliary gas supply line are connected to the reaction chamber. The main gas supply line is located near the bottom of the reaction chamber, the auxiliary gas supply line is located between the liquid supply line and the gas supply line, and the blade gas supply line is connected to the gas supply blade structure. The discharge assembly includes a discharge pipeline and a solid-liquid separation device. The two ends of the discharge pipeline are connected to the bottom of the reaction chamber and the solid-liquid separation device, respectively. The discharge pipeline is used to discharge the solid slurry containing calcium carbonate crystals, and the solid-liquid separation device is used to separate the calcium carbonate crystals and the clear liquid in the solid slurry.

[0006] In one embodiment, the curing system further includes a slurry circulation component, which includes a circulation pipeline. Both ends of the circulation pipeline are connected to the reaction chamber, and the two ends of the circulation pipeline are respectively located near the bottom end of the reaction chamber and the middle region of the reaction chamber. A circulation pump is installed on the circulation pipeline.

[0007] In one embodiment, the curing system further includes a clear liquid recovery component, which includes a gas-liquid separator, a clear liquid collection tank, and a first recovery pipeline. The gas-liquid separator is located at the top of the reaction chamber, and the clear liquid collection tank is located below the gas-liquid separator and is used to collect the clear liquid separated by the gas-liquid separator. The first recovery pipeline is connected to the clear liquid collection tank.

[0008] In one embodiment, an overflow weir is provided between the clear liquid collection tank and the first recovery pipeline.

[0009] In one embodiment, a gas distribution pipe is also provided in the reaction chamber. The gas distribution pipe is connected to the main gas supply pipeline and extends in a horizontal direction. Multiple gas supply ports are spaced apart on the gas distribution pipe along its extension direction.

[0010] In one embodiment, all gas outlets on the gas distribution pipe are arranged downwards, and each gas outlet is connected to a downward-arranged conduit.

[0011] In one embodiment, regulating valves are provided on the main air supply line, the auxiliary air supply line, and the blade air supply line.

[0012] In one embodiment, the solid-liquid separation device is also connected to a second recovery pipeline, on which a pH detection unit is installed. The pH detection unit and all regulating valves are electrically connected to a controller.

[0013] In one embodiment, a carbon dioxide gas analysis unit is installed on the exhaust pipe, and the carbon dioxide gas analysis unit is electrically connected to the controller.

[0014] In one embodiment, the gas supply assembly includes a plurality of auxiliary gas supply lines arranged at vertical intervals, all of which are located between the liquid supply line and the main gas supply line.

[0015] In one embodiment, the stirring assembly includes a plurality of stirring blade structures arranged vertically at intervals, all of which are disposed above the air supply blade structure.

[0016] In one embodiment, the bottom of the reaction chamber is funnel-shaped, gradually narrowing from top to bottom.

[0017] In one embodiment, the stirring shaft is a hollow stirring shaft, and the air supply blade structure includes air supply blades disposed at the bottom of the stirring shaft. Multiple air supply nozzles are formed on each air supply blade, and the air supply pipeline of the blade and all air supply nozzles are connected to the stirring shaft.

[0018] The present invention also proposes a curing method for a calcium-containing leachate, which utilizes the aforementioned curing system for the calcium-containing leachate.

[0019] The technical solution of this invention supplies calcium-containing leachate from the top of the reaction chamber via a liquid supply assembly. Carbon dioxide gas is supplied to different height regions of the reaction chamber via the main gas supply pipeline, auxiliary gas supply pipeline, and impeller gas supply pipeline of the gas supply assembly. The stirring shaft of the stirring assembly drives the stirring impeller structure and the gas supply impeller structure to rotate, ensuring uniform mixing and thorough reaction of the calcium-containing leachate and carbon dioxide gas within the reaction chamber. Because the gas supply impeller structure is located at the bottom of the stirring shaft and sprays carbon dioxide gas as the shaft rotates, while the stirring impeller structure is positioned above the gas supply impeller structure for stirring, a uniform flow field from bottom to top is formed. This avoids localized oversaturation of the calcium-containing leachate or the instantaneous formation of a large number of ultrafine calcium carbonate crystals within the reaction chamber, improving the uniformity and stability of the wet carbonation reaction and resulting in a more uniform particle size distribution of the generated calcium carbonate crystals. Furthermore, the paddle-driven gas supply structure can utilize the high-speed liquid flow scouring and centrifugal self-cleaning effect to prevent the deposition and scaling of fine carbonate particles at the gas outlet. At the same time, the gas is directly injected into the core reaction area located below the reaction chamber. The carbon dioxide gas ejected by the paddle-driven gas supply structure can be broken into microbubbles, which can significantly improve the local gas-liquid mass transfer specific surface area and reaction efficiency, thereby improving the utilization rate of carbon dioxide and calcium-containing leachate. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of an embodiment of the curing system for calcium-containing leachate provided by the present invention.

[0022] Explanation of icon numbers: 100. Curing system; 10. Reactor; 11. Reaction chamber; 20. Exhaust pipe; 21. Carbon dioxide gas analysis unit; 30. Stirring assembly; 31. Stirring shaft; 32. Stirring blade structure; 33. Air supply blade structure; 331. Air supply blade; 332. Air supply nozzle; 40. Liquid supply assembly; 41. Liquid supply pipe; 50. Air supply assembly; 51. Main air supply pipe; 52. Auxiliary air supply pipe; 53. Blade air supply Piping; 54. Gas supply distribution pipe; 55. Conduit; 56. Regulating valve; 60. Discharge assembly; 61. Discharge pipeline; 62. Solid-liquid separation device; 63. Second recovery pipeline; 64. pH detection unit; 70. Slurry circulation assembly; 71. Circulation pipeline; 72. Circulation pump; 80. Clear liquid recovery assembly; 81. Gas-liquid separator; 82. Clear liquid collection tank; 83. First recovery pipeline; 84. Overflow weir; 90. Controller.

[0023] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0026] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0027] Industrial processes such as thermal power, coal chemical, metallurgical, and building materials production generate large quantities of calcium-containing industrial solid waste, encompassing bulk solid wastes such as fly ash, gasification slag, desulfurization ash, smelting slag, calcium carbide slag, and calcium-containing tailings. Open-air storage of this type of solid waste occupies land and poses environmental risks such as dust and leachate pollution. The active calcium component in the solid waste can be dissolved through processes such as ammonium salt leaching, salt leaching, and weak acid leaching to prepare calcium-containing leachate. By reacting the calcium-containing leachate with carbon dioxide-containing industrial tail gas through a wet carbonation reaction to generate calcium carbonate, calcium carbonate can be generated, achieving both resource utilization of solid waste and permanent sealing of carbon dioxide waste gas in a mineral solidification form.

[0028] Currently, the wet carbonation reaction between calcium-containing leachate and carbon dioxide-containing industrial tail gas is uneven, easily leading to local oversaturation of the calcium-containing leachate or the instantaneous generation of a large number of ultrafine calcium carbonate crystals. This results in poor stability of the generated calcium carbonate and makes it difficult for the calcium-containing leachate and carbon dioxide to react completely. The utilization rate of carbon dioxide and calcium-containing leachate is low, resulting in a large consumption of calcium-containing leachate and carbon dioxide.

[0029] This invention proposes a curing system 100 for a calcium-containing leachate.

[0030] Please see Figure 1In one embodiment of the present invention, the solidification system 100 for the calcium-containing leachate includes: a reactor 10, a stirring assembly 30, a liquid supply assembly 40, a gas supply assembly 50, and a discharge assembly 60; wherein, a vertically arranged reaction chamber 11 is formed in the reactor 10, and the top of the reaction chamber 11 is connected to an exhaust pipe 20; the stirring assembly 30 is disposed in the reaction chamber 11, and the stirring assembly 30 includes a stirring shaft 31, a stirring blade structure 32, and a gas supply blade structure 33. The stirring shaft 31 is vertically arranged and can rotate around its own axis, the gas supply blade structure 33 is disposed at the bottom end of the stirring shaft 31, and the stirring blade structure 32 is disposed on the stirring shaft 31 and located above the gas supply blade structure 33, and the gas supply blade structure 33 can spray carbon dioxide gas; the liquid supply assembly 40 includes a liquid supply pipe 41 for supplying the calcium-containing leachate, and the liquid supply... Pipeline 41 is connected to the reaction chamber 11 and is located near the top of the reaction chamber 11; the gas supply assembly 50 includes a main gas supply pipeline 51, an auxiliary gas supply pipeline 52, and a blade gas supply pipeline 53 for supplying carbon dioxide gas. Both the main gas supply pipeline 51 and the auxiliary gas supply pipeline 52 are connected to the reaction chamber 11, and the main gas supply pipeline 51 is located near the bottom of the reaction chamber 11. The auxiliary gas supply pipeline 52 is located between the liquid supply pipeline 41 and the main gas supply pipeline. The blade gas supply pipeline 53 is connected to the gas supply blade structure 33; the discharge assembly 60 includes a discharge pipeline 61 and a solid-liquid separation device 62. The two ends of the discharge pipeline 61 are connected to the bottom of the reaction chamber 11 and the solid-liquid separation device 62, respectively. The discharge pipeline 61 is used to discharge the solid slurry containing calcium carbonate crystals, and the solid-liquid separation device 62 is used to separate the calcium carbonate crystals and the clear liquid in the solid slurry.

[0031] The calcium-containing leachate curing system 100 provided by the present invention, during operation, allows the calcium-containing leachate to enter the reaction chamber 11 from the top through the liquid supply pipe 41. Carbon dioxide gas is injected into the reaction chamber 11 from the bottom through the main gas supply pipe 51, from the middle through the auxiliary gas supply pipe 52, and from the bottom through the impeller gas supply pipe 53 via the gas supply impeller structure 33. The stirring shaft 31 rotates around its own axis, driving the stirring impeller structure 32 and the gas supply impeller structure 33 to rotate. During rotation, the gas supply impeller structure 33 ejects carbon dioxide gas, and the stirring impeller structure 32 stirs the gas-liquid mixture in the reaction chamber 11. Under the stirring action of the stirring blade structure 32 and the combined action of multiple air supply points including the main air supply pipeline 51, the auxiliary air supply pipeline 52, and the air supply blade structure 33, the calcium-containing leachate and carbon dioxide gas are uniformly mixed and fully contacted in the reaction chamber 11, resulting in a wet carbonation reaction to produce calcium carbonate crystals. The solid-containing slurry after the reaction enters the solid-liquid separation device 62 through the discharge pipeline 61, and after separation by the solid-liquid separation device 62, calcium carbonate crystals and clear liquid are obtained.

[0032] This invention supplies calcium-containing leachate from the top of the reaction chamber 11 via a liquid supply assembly 40. Carbon dioxide gas is supplied to different height regions of the reaction chamber 11 via the main gas supply line 51, auxiliary gas supply line 52, and impeller gas supply line 53 of the gas supply assembly 50. The stirring shaft 31 of the stirring assembly 30 drives the stirring impeller structure 32 and the gas supply impeller structure 33 to rotate, ensuring uniform mixing and thorough reaction of the calcium-containing leachate and carbon dioxide gas within the reaction chamber 11. Since the gas supply impeller structure 33 is located at the bottom of the stirring shaft 31 and sprays carbon dioxide gas as the shaft rotates, and the stirring impeller structure 32 is positioned above the gas supply impeller structure 33 for stirring, a uniform flow field from bottom to top is formed. This avoids localized oversaturation of the calcium-containing leachate or the instantaneous formation of a large number of ultrafine calcium carbonate crystals within the reaction chamber 11, improving the uniformity and stability of the wet carbonation reaction and resulting in a more uniform particle size distribution of the generated calcium carbonate crystals. Furthermore, the paddle-driven gas supply structure can utilize the high-speed liquid flow scouring and centrifugal self-cleaning effect to prevent the deposition and scaling of fine carbonate particles at the gas outlet. At the same time, the gas is directly injected into the core reaction area located below the reaction chamber 11. The carbon dioxide gas ejected by the paddle-driven gas supply structure can be broken into microbubbles by shearing the gas, which greatly improves the local gas-liquid mass transfer specific surface area and reaction efficiency, thereby increasing the utilization rate of carbon dioxide and calcium-containing leachate.

[0033] Meanwhile, through a multi-point gas supply system consisting of the main gas supply line 51, the auxiliary gas supply line 52, and the impeller gas supply line 53, combined with the stirring action of the impeller structure 32, the contact area and contact time between carbon dioxide gas and calcium-containing leachate are significantly increased. This allows for a more complete reaction between carbon dioxide and calcium-containing leachate, improving their utilization rate and reducing raw material consumption. Furthermore, the continuous liquid supply component 40, continuous gas supply component 50, continuous stirring component 30, and continuous material discharge component 60 enable continuous production of calcium carbonate. The exhaust pipe 20 connected to the top of the reaction chamber 11 can promptly discharge gases generated during the reaction and unreacted tail gas, maintaining stable pressure within the reaction chamber 11 and ensuring a safe and stable reaction.

[0034] In one embodiment of the present invention, the curing system 100 further includes a slurry circulation component 70, which includes a circulation pipeline 71. Both ends of the circulation pipeline 71 are connected to the reaction chamber 11, and the two ends of the circulation pipeline 71 are respectively located near the bottom end of the reaction chamber 11 and the middle region of the reaction chamber 11. A circulation pump 72 is provided on the circulation pipeline 71.

[0035] Specifically, the circulating pump 72 draws the slurry from the bottom of the reaction chamber 11 and transports it to the middle region of the reaction chamber 11, creating a circulating flow between the bottom and upper parts of the reaction chamber 11. On the one hand, slurry circulation effectively prevents the deposition of solids such as calcium carbonate crystals at the bottom of the reaction chamber 11, preventing blockage of the discharge pipe 61 and ensuring stable operation of continuous production. On the other hand, it can transport the higher concentration of slurry from the bottom of the reaction chamber 11 to the middle region of the reaction chamber 11, effectively preventing excessively high local concentrations of calcium-containing leachate and avoiding the instantaneous generation of a large number of ultrafine calcium carbonate crystals. It also replenishes the concentration of calcium-containing leachate in the middle region of the reaction chamber 11, ensuring that the middle region of the reaction chamber 11 also has a high concentration of calcium-containing leachate. This allows the calcium-containing leachate in the middle region of the reaction chamber 11 to fully contact and react with carbon dioxide gas, further improving the utilization rate of calcium-containing leachate and carbon dioxide and reducing raw material waste.

[0036] Furthermore, a jet mixer is added inside the circulation loop, which can introduce some carbon dioxide-containing gas, enabling the external circulation loop to have the dual functions of seed crystal reflux and auxiliary gas-liquid mass transfer enhancement. Problems such as slurry reflux flow fluctuations and flow field imbalances within reaction chamber 11 caused by the circulation air intake can be avoided through coordinated control of the total system air intake distribution ratio.

[0037] In one embodiment of the present invention, the curing system 100 further includes a clear liquid recovery component 80, which includes a gas-liquid separator 81, a clear liquid collection tank 82, and a first recovery pipeline 83. The gas-liquid separator 81 is disposed at the top of the reaction chamber 11, the clear liquid collection tank 82 is disposed below the gas-liquid separator 81, and is used to collect the clear liquid separated by the gas-liquid separator 81. The first recovery pipeline 83 is connected to the clear liquid collection tank 82.

[0038] Specifically, by setting up a clear liquid recovery component 80 and a gas-liquid separator 81 in the gas-liquid separation zone at the top of the reaction chamber 11, the upward-flowing gas-liquid mixture is separated, effectively trapping calcium-containing leachate droplets or mist carried in the exhaust gas, reducing raw material loss caused by calcium-containing leachate being discharged with the exhaust gas, and improving the utilization rate of calcium-containing leachate. A clear liquid collection tank 82 is located below the gas-liquid separator 81, enabling timely collection of the clear liquid separated by the gas-liquid separator 81. The first recovery pipeline 83 is connected to the clear liquid collection tank 82, allowing the collected clear liquid to be exported for recycling, achieving the recycling of clear liquid, reducing production costs, and reducing wastewater discharge.

[0039] Furthermore, the interior of the reaction chamber 11 is divided into three distinct functional zones from top to bottom: a top gas-liquid separation zone, a middle liquid-phase reaction zone, and a lower crystal growth zone. The clear liquid recovery component 80 is located in the top gas-liquid separation zone. The gas-liquid separation zone and the liquid-phase reaction zone are relatively independent, preventing droplets or mist from entering the exhaust pipe 20 and causing blockage or corrosion, ensuring smooth exhaust and long-term stable operation of the system. At the same time, the middle liquid-phase reaction zone can focus on the carbonation reaction, and the lower crystal growth zone can focus on crystal growth and sedimentation, improving the space utilization efficiency of the reaction chamber 11 and the functional specialization of each zone.

[0040] In one embodiment of the present invention, an overflow weir 84 is provided between the clear liquid collection tank 82 and the first recovery pipeline 83.

[0041] Specifically, during operation, the clarified liquid separated by the gas-liquid separator 81 drips into the clarified liquid collection tank 82, where it undergoes initial sedimentation, with heavier solid impurities settling to the bottom. The relatively clean clarified liquid at the top overflows through the overflow weir 84 into the first recovery pipeline 83 once the liquid level reaches the height of the overflow weir 84. The overflow weir 84 utilizes the principle of gravity overflow to ensure that the collected clarified liquid is stably discharged through the upper clarified liquid outlet, providing a clean liquid source for the system's liquid phase recycling.

[0042] Furthermore, the gas-liquid separator 81 is a demister in the prior art.

[0043] In one embodiment of the present invention, the gas-liquid separator 81 is disposed at the opening where the exhaust pipe 20 communicates with the reaction chamber 11.

[0044] In one embodiment of the present invention, a wire mesh demister and a baffle plate demister are connected in series above the clear liquid collection tank 82.

[0045] In one embodiment of the present invention, the liquid supply pipeline 41 is located below the clear liquid collection tank 82, which can effectively avoid disturbing the upper static liquid surface by the feed liquid flow, ensure the clarity and collection stability of the upper clear liquid, and provide structural protection for the long-term stable reuse of the system.

[0046] In one embodiment of the present invention, a gas supply distribution pipe 54 is also provided in the reaction chamber 11. The gas supply distribution pipe 54 is connected to the main gas supply pipeline 51 and extends in the horizontal direction. Multiple gas supply ports are spaced apart on the gas supply distribution pipe 54 along its extension direction.

[0047] Specifically, by setting a gas distribution pipe 54 connected to the main gas supply line 51 in the reaction chamber 11, the gas distribution pipe 54 extends horizontally and has multiple gas supply ports spaced apart along its extension direction, so that the carbon dioxide gas entering through the main gas supply line 51 can be evenly distributed horizontally at the bottom of the reaction chamber 11 through multiple gas supply ports, avoiding local gas concentration or insufficient local gas volume caused by single-point gas intake, and improving the uniformity of carbon dioxide gas distribution in the horizontal direction at the bottom of the reaction chamber 11.

[0048] As carbon dioxide gas enters the reaction chamber 11 uniformly through multiple gas supply ports, it forms a more uniform gas-liquid contact interface with the calcium-containing leachate at the bottom of the reaction chamber 11. This effectively avoids the situation where the calcium-containing leachate is locally oversaturated or a large number of ultrafine calcium carbonate crystals are generated locally in an instant. This greatly improves the uniformity and stability of the wet carbonation reaction and makes the generated calcium carbonate crystals have a more uniform particle size distribution.

[0049] In one embodiment of the present invention, all the air supply ports on the air supply distribution pipe 54 are arranged downwards, and each air supply port is connected to a downwardly arranged conduit 55.

[0050] Specifically, by setting all the gas supply ports on the gas supply distribution pipe 54 downwards and connecting each gas supply port to a corresponding downward-facing conduit 55, carbon dioxide gas is allowed to directly enter the deep liquid phase at the bottom of the reaction chamber 11 from the gas supply distribution pipe 54. Because the gas supply ports and conduits 55 are downward-facing, backflow of slurry into the gas supply distribution pipe 54 and the main gas supply line 51 is effectively prevented, and calcium carbonate crystals are also prevented from depositing and clogging the gas supply ports, ensuring smooth gas supply and continuous and stable system operation. Furthermore, the downward-facing conduits 55 guide the carbon dioxide gas to the deep liquid phase before releasing it, causing the gas to form finer bubbles in the liquid phase and rise along a longer path. This significantly increases the gas-liquid contact area between the carbon dioxide gas and the calcium-containing leachate, prolonging the gas's residence time in the liquid phase, allowing for a more complete reaction between the carbon dioxide and the calcium-containing leachate, and improving the utilization rate of both carbon dioxide and the calcium-containing leachate.

[0051] In addition, the downward-facing gas supply port and conduit 55 allow carbon dioxide gas to diffuse evenly upward from the bottom of the reaction chamber 11. This, combined with the carbon dioxide gas ejected by the rotating gas supply blade structure 33 and the stirring action of the stirring blade structure 32, creates a more uniform gas-liquid mixing flow field within the reaction chamber 11. This effectively avoids local oversaturation of the calcium-containing leachate or the instantaneous generation of a large number of ultrafine calcium carbonate crystals, further improving the uniformity and stability of the wet carbonation reaction and resulting in a more uniform distribution of the generated calcium carbonate crystals.

[0052] In one embodiment of the present invention, regulating valves 56 are provided on the main air supply line 51, the auxiliary air supply line 52 and the blade air supply line 53.

[0053] Specifically, by installing regulating valves 56 on the main gas supply line 51, the auxiliary gas supply line 52, and the impeller gas supply line 53, independent adjustment of the gas supply points at the bottom, middle, and bottom of the stirring shaft 31 of the reaction chamber 11 is achieved. This allows for adjustment of the gas flow rate and pressure of each gas supply line according to the reaction progress, load changes, or fluctuations in the concentration of the calcium-containing leachate. This ensures that the carbon dioxide supply in different height areas of the reaction chamber 11 matches the reaction requirements of the calcium-containing leachate, effectively avoiding oversaturation of the calcium-containing leachate due to excessive local gas supply or incomplete reaction due to insufficient local gas supply, thus improving the uniformity and stability of the wet carbonation reaction.

[0054] Meanwhile, by using regulating valve 56 to precisely control the gas supply to each path, the distribution of carbon dioxide gas in the reaction chamber 11 can be optimized, reducing the direct upward discharge of unreacted carbon dioxide due to mismatched gas supply, thereby improving the utilization rate of carbon dioxide and reducing raw material consumption and production costs.

[0055] It should be noted that the adjustment priority of the main air supply line 51, the auxiliary air supply line 52 and the blade air supply line 53 is as follows: adjust the auxiliary air supply line 52 first, then adjust the blade air supply line 53, and finally adjust the main air supply line 51.

[0056] In one embodiment of the present invention, the solid-liquid separation device 62 is also connected to a second recovery pipeline 63, on which a pH detection unit is provided. The pH detection unit and all regulating valves 56 are electrically connected to a controller 90.

[0057] Furthermore, by connecting the solid-liquid separation device 62 to the second recovery pipeline 63 and installing a pH detection unit on the second recovery pipeline 63, the pH detection unit and all regulating valves 56 are electrically connected to the controller 90. The pH detection unit monitors the pH value of the separated clarified liquid in real time, accurately reflecting the actual progress of the wet carbonation reaction within the reaction chamber 11, providing direct and reliable feedback for gas supply regulation. The controller 90 automatically adjusts the opening of the regulating valves 56 on each gas supply pipeline based on the pH signal from the pH detection unit, achieving real-time dynamic matching between the carbon dioxide supply and the reaction requirements of the calcium-containing leachate. This avoids the lag and subjective errors of manual adjustment, ensuring that the carbon dioxide supply in each height area of ​​the reaction chamber 11 is always at its optimal level. This effectively prevents oversaturation of the calcium-containing leachate due to excessive local gas supply or incomplete reaction due to insufficient local gas supply, improving the uniformity, stability, and automation level of the wet carbonation reaction.

[0058] In one embodiment of the present invention, a pH detection unit is also provided on the first recovery pipeline 83. This forms a dual-point pH monitoring layout between the first recovery pipeline 83 and the second recovery pipeline 63. The first recovery pipeline 83 detects the pH of the clear liquid after gas-liquid separation at the top of the reaction chamber 11, reflecting the reaction state in the upper region of the reaction chamber 11; the second recovery pipeline 63 detects the pH of the clear liquid finally discharged after solid-liquid separation, reflecting the liquid phase state after the reaction is complete. The two pH detection units work together to comprehensively reflect the reaction uniformity in different height regions within the reaction chamber 11, providing a more comprehensive and accurate feedback basis for the controller 90 to adjust the regulating valves 56 of each gas supply pipeline.

[0059] In one embodiment of the present invention, a carbon dioxide gas analysis unit 21 is provided on the exhaust pipe 20, and the carbon dioxide gas analysis unit 21 is electrically connected to the controller 90.

[0060] Specifically, by installing a carbon dioxide gas analysis unit 21 on the exhaust pipe 20 and electrically connecting the carbon dioxide gas analysis unit 21 to the controller 90, the concentration of carbon dioxide in the exhaust gas can be monitored in real time, directly reflecting the degree of carbon dioxide consumption and the reaction status in the reaction chamber 11, providing a more comprehensive feedback basis for gas supply regulation.

[0061] When the carbon dioxide concentration in the exhaust gas is too high, it indicates that the carbon dioxide supply in the reaction chamber 11 is excessive or the reaction is incomplete. Based on the feedback signal from the carbon dioxide gas analysis unit 21, the controller 90 automatically reduces the opening of the regulating valve 56 on the main gas supply line 51, the auxiliary gas supply line 52, and / or the impeller gas supply line 53 to reduce the carbon dioxide supply. When the carbon dioxide concentration in the exhaust gas is too low, it indicates that the reaction is fully consumed, and the gas supply can be appropriately increased to improve the reaction load. By cooperating with the pH detection unit, a dual-parameter closed-loop control of liquid phase pH and gas phase carbon dioxide concentration is formed, making the gas supply adjustment more precise and timely, effectively avoiding excessive or insufficient carbon dioxide supply, improving the utilization rate of carbon dioxide, and reducing raw material consumption and production costs.

[0062] It should be noted that the regulating valve 56 can be an electric regulating valve 56 as used in the prior art; the carbon dioxide gas analysis unit 21 can be an infrared carbon dioxide analyzer, a thermal conductivity gas analyzer, or a laser gas analyzer as used in the prior art; the pH detection unit can be an industrial online pH meter as used in the prior art; and the controller 90 can be a programmable logic controller 90 (PLC), a distributed control system (DCS), or an industrial microcontroller as used in the prior art. The interaction between the regulating valve 56, the carbon dioxide gas analysis unit 21, the pH detection unit, and the controller 90 can adopt the interaction methods of the prior art.

[0063] In one embodiment of the present invention, the gas supply assembly 50 includes a plurality of auxiliary gas supply lines 52 arranged vertically at intervals, and the plurality of auxiliary gas supply lines 52 are all located between the liquid supply line 41 and the gas supply line.

[0064] Specifically, by setting up multiple auxiliary gas supply lines 52 arranged vertically at intervals, and all of the multiple auxiliary gas supply lines 52 being located between the liquid supply line 41 and the main gas supply line 51, a multi-layered auxiliary gas supply is formed in the middle region of the reaction chamber 11, so that sufficient and uniformly distributed carbon dioxide gas can be obtained at different height positions in the middle of the reaction chamber 11. This effectively makes up for the defects of insufficient gas volume or large concentration gradient in the middle when relying solely on the main gas supply line 51 and the blade gas supply line 53 to supply gas from the bottom. Because multiple auxiliary gas supply lines 52 are distributed vertically at intervals, together with the main gas supply line 51 and the blade gas supply line 53, they form a three-dimensional gas supply network from the bottom to the middle of the reaction chamber 11. This allows the calcium-containing leachate to be evenly contacted with carbon dioxide gas at various heights in the reaction chamber 11 as it flows downward after entering from the upper liquid supply line 41. This significantly improves the uniformity and sufficiency of gas-liquid contact, effectively avoiding local oversaturation of the calcium-containing leachate or the instantaneous generation of a large number of ultrafine calcium carbonate crystals in the reaction chamber 11, thus improving the uniformity and stability of the wet carbonation reaction.

[0065] In one embodiment of the present invention, the stirring assembly 30 includes a plurality of stirring blade structures 32 arranged vertically at intervals, and the plurality of stirring blade structures 32 are all disposed above the air supply blade structure 33.

[0066] Specifically, multiple stirring blade structures 32 are vertically spaced and cooperate with the gas supply blade structure 33 to form a continuous stirring flow field from bottom to top within the reaction chamber 11. This allows the carbon dioxide gas ejected from the bottom of the reaction chamber 11 to be continuously subjected to stirring and shearing action during its ascent, breaking it into smaller bubbles. This significantly increases the gas-liquid contact area and prolongs the residence time of carbon dioxide in the liquid phase, enabling a more complete reaction between carbon dioxide and the calcium-containing leachate, thus improving the utilization rate of both carbon dioxide and the calcium-containing leachate. Simultaneously, the multi-layered stirring blade structure 32 makes the concentration of the calcium-containing leachate and the distribution of carbon dioxide more uniform across different height regions within the reaction chamber 11. This effectively avoids localized oversaturation of the calcium-containing leachate or the instantaneous formation of large amounts of ultrafine calcium carbonate crystals, improving the uniformity and stability of the wet carbonation reaction.

[0067] In one embodiment of the present invention, the bottom of the reaction chamber 11 is funnel-shaped, gradually narrowing from top to bottom.

[0068] Specifically, by setting the bottom of the reaction chamber 11 into a funnel shape that gradually narrows from top to bottom, the solid slurry generated within the reaction chamber 11 can naturally converge towards the center of the bottom under gravity. This facilitates the collection and discharge of the solid slurry, effectively reducing dead zones in the planar deposition at the bottom of the reaction chamber 11, preventing the accumulation of calcium carbonate crystals at the bottom edge of the reaction chamber 11, preventing blockage of the discharge pipe 61, and ensuring stable operation of continuous production. Simultaneously, the funnel-shaped bottom, in conjunction with the stirring assembly 30, creates a converging flow field at the bottom of the reaction chamber 11, which is beneficial for the slurry to flow towards the discharge port, improving discharge efficiency. This converging flow field also prevents oversaturation of the calcium-containing leachate due to slurry stagnation in localized areas at the bottom, further improving the uniformity and stability of the wet carbonation reaction.

[0069] In one embodiment of the present invention, the stirring shaft 31 is a hollow stirring shaft 31, and the air supply blade structure 33 includes an air supply blade 331 disposed at the bottom of the stirring shaft. Each air supply blade 331 has a plurality of spaced air supply nozzles 332, and the blade air supply pipeline 53 and all air supply nozzles 332 are connected to the stirring shaft 31.

[0070] Specifically, by setting the stirring shaft 31 as a hollow stirring shaft 31, the hollow stirring shaft 31 has both rotation and internal gas conveying functions. The carbon dioxide gas conveyed by the impeller gas supply pipeline 53 is directly distributed to each gas supply blade 331 through the hollow stirring shaft 31. The structure is compact, eliminating the need for additional complex external gas supply pipelines in the reaction chamber 11, reducing pipeline space occupation and gas leakage risk, and improving the safety and reliability of system operation. Furthermore, gas supply blades 331 are provided at the bottom of the stirring shaft, and multiple gas supply nozzles 332 are distributed at intervals on the gas supply blades 331, so that carbon dioxide gas is uniformly sprayed out from the bottom of the reaction chamber 11 in multiple directions and at multiple points along the circumferential and radial directions, expanding the bottom gas supply coverage area, avoiding local gas concentration caused by single-point or unidirectional gas intake, and forming a more uniform gas-liquid contact interface between carbon dioxide gas and calcium-containing leachate at the bottom of the reaction chamber 11.

[0071] In one embodiment, the solid-liquid separation device 62 can be flexibly adapted to single or combined separation equipment such as sedimentation, filtration, pressure filtration, centrifugation, and cyclone separation according to actual production conditions, adapting to the separation needs of calcium carbonate slurry with different crystal sizes and solid contents. The high-solids-content calcium carbonate slurry enriched at the bottom of the reactor 10 is continuously or intermittently fed into the solid-liquid separation device 62, and the solid phase calcium carbonate crystals are effectively separated from the liquid phase water through mechanical separation. The separated solid phase calcium carbonate product has uniform particle size and stable phase, and can be directly recycled as a resource product; the separated clear liquid can be combined with the clear liquid collected in the recovery pipeline at the top of the reactor 10 and uniformly returned to the reactor 10 body for recycling, constructing a complete liquid phase closed-loop recycling system, greatly improving water resource utilization and reducing production losses.

[0072] It should be noted that the solid-liquid separation device 62 can be universally used with single or combined separation equipment such as sedimentation, filtration, pressure filtration, centrifugation, and hydrocyclone. For different production scales and product precision requirements, specific combined alternative solutions can be adopted: a two-stage combination of hydrocyclone coarse separation and pressure filtration fine separation, where the slurry is pre-concentrated by a hydrocyclone, the clarified liquid is directly reused, and the high-solids-content underflow is sent to a pressure filtration unit for deep dehydration, suitable for conventional continuous production conditions; continuous filtration equipment such as belt filters and rotary drum vacuum filters, suitable for large-scale, high-flow industrial production lines; and precision filtration equipment such as ceramic membranes and organic membranes, suitable for the stringent requirements of low turbidity and high cleanliness of the reused clarified liquid (turbidity <10ppm).

[0073] The present invention also proposes a curing method for a calcium-containing leachate. The curing method for the calcium-containing leachate uses a curing system 100 for the calcium-containing leachate. The specific structure of the curing system 100 for the calcium-containing leachate is as described in the above embodiments. Since the curing method for the calcium-containing leachate adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0074] In one embodiment of the present invention, the solidification method of the calcium-containing leachate includes the following steps: Step 1: Preparation and Feeding of Calcium-Containing Liquid Phase Calcium-containing solid waste (fly ash, carbide slag, steel slag, desulfurization ash, etc.) is treated with acid leaching, salt leaching, or ammonium salt leaching processes to prepare calcium-containing leachate. The calcium ion concentration in the leachate is controlled within the range of 0.5~2.0 mol / L, and the pH value is controlled within the range of 8.0~12.0. The leachate is continuously fed into the reaction chamber 11 through the supply pipeline 41. The feed flow rate is adjusted according to the volume of reactor 10 and the target throughput to maintain the liquid level in the reaction chamber 11 at a set height (usually 60%~80% of the effective volume of the reaction chamber 11).

[0075] Step 2: Staged gas supply and carbonation reaction The system simultaneously supplies carbon dioxide-containing gas (which can be pure carbon dioxide, carbon-rich flue gas, or low-concentration industrial tail gas) through the main gas supply pipeline 51, the auxiliary gas supply pipeline 52, and the blade gas supply pipeline 53.

[0076] It should be noted that the main air supply line 51 accounts for 40% to 60% of the total air intake; the blade air supply line 53 accounts for 10% to 30% of the total air intake, and the gas is sheared and broken into microbubbles (50 to 500 μm in diameter) by the blades; the auxiliary air supply line 52 accounts for 20% to 40% of the total air intake, realizing axial gradient air replenishment.

[0077] The stirring assembly 30 is started synchronously: multiple stirring blade structures 32 perform homogeneous stirring throughout the entire area, with the stirring speed controlled at 100~500 rpm; the air supply blade structure 33 creates a local high-shear flow field to enhance gas-liquid mass transfer. The reaction temperature in the reaction chamber 11 is controlled at 20~60℃.

[0078] Step 3: Seed reflux and crystallization control The circulating pump 72 draws and transports the slurry from the lower part of the reactor 10 through the circulating pipeline 71, controlling the circulating flow rate to be 1 to 2 times the feed flow rate of the reactor 10. The slurry returns to the lower part of the reactor 10 tangentially or at an inclined tangential direction through the return port, forming a swirling flow field, which makes the seed crystals in the return slurry uniformly dispersed. This step continues to run, and the mature seed crystals in the return slurry provide a crystal growth surface, absorb instantaneous supersaturation, inhibit the explosive generation of new crystal nuclei, and guide the orderly growth of calcium carbonate on the seed crystal surface.

[0079] Step 4: Product fractionation The calcium carbonate crystals generated in the reaction settle under gravity and accumulate and mature at the bottom of reactor 10. The high-solids-content slurry is discharged continuously or intermittently through discharge pipe 61 and sent to solid-liquid separation device 62. The discharge flow rate can be controlled by valves or pumps installed on discharge pipe 61 to match the discharge rate with the feed rate and maintain a stable liquid level in reaction chamber 11. Solid-liquid separation is selected from one or a combination of sedimentation, filtration, pressure filtration, centrifugation, or cyclone separation. The separated solid calcium carbonate product is recycled, and the clear liquid is returned to the system through the clear liquid return pipeline. At the same time, the low-solids-content clear liquid at the top of reactor 10 overflows through overflow weir 84 and is discharged through the upper clear liquid first recovery pipeline 83. It is then combined with the clear liquid produced by solid-liquid separation device 62 for the preparation of calcium-containing leaching solution.

[0080] Step 5: Reuse all supernatant Both the clarified liquid separated by the solid-liquid separation device 62 and the clarified liquid separated by the overflow weir 84 are produced as products. These products can be combined and recycled via the second recovery pipeline 63 and the first recovery pipeline 83, with the combined and recycled clarified liquid being used entirely as the circulating medium for preparing the calcium-containing leaching solution. This achieves a 100% reuse rate, allowing the clarified liquid to participate in the circulation process. The calcium-containing leaching solution, re-prepared using the clarified liquid, enters the reaction chamber 11 to participate in the reaction. The residual alkaline components and water carried by the solution are recovered and reused, effectively reducing the amount of fresh leaching solution and water required for replenishment. It should be noted that after recovering the clarified liquid, ammonia, hydrochloric acid, or process water needs to be added to adjust the pH value to meet the requirements for re-preparing the calcium-containing leaching solution.

[0081] Step Six: Multi-parameter detection and dynamics During system operation, the top carbon dioxide gas analysis unit 21 monitors the carbon dioxide concentration in the gas discharged from the exhaust pipe 20 in real time, and the pH detection unit monitors the pH value of the clarified liquid in real time. The controller 90 receives electrical signals from the carbon dioxide gas analysis unit 21 and the pH detection unit, and automatically adjusts according to the following three-level progressive logic: First priority: When the carbon dioxide concentration in the exhaust gas is too high, the opening of the auxiliary gas supply line 52 should be adjusted first to optimize the axial distribution of gas and reduce gas short circuits. Second priority (enhancing local mass transfer): If the carbon dioxide concentration in the exhaust gas is still too high after adjusting the side air intake, adjust the blade air supply line 53 to increase the air intake of the blade air supply line 53 and enhance gas-liquid mass transfer by utilizing the high shear zone. Third priority (matching total load): If the system is still unstable after the above adjustments, adjust the feed flow rate of the bottom main gas supply pipeline 51 to match the total reaction load from the source.

[0082] Simultaneously, based on the deviation of the pH value of the clarified liquid in the second pipeline from the target range (7.5~8.0), the degree of reaction is further judged: if the pH is too high, the carbon dioxide supply is appropriately increased; if the pH is too low, the carbon dioxide supply is appropriately reduced. Through the above closed-loop control, the system maintains the optimal reaction state of tail gas carbon dioxide concentration <5% and the pH of the clarified liquid in the first pipeline is stable at 7.5~8.0.

[0083] In summary, this invention effectively addresses the technical shortcomings of traditional calcium-containing solid waste carbonation processes through an integrated and synergistic design. This design incorporates graded gradient gas distribution coupled with agitated gas induction to enhance mass transfer, precise crystallization control via external circulation seed reflux, gas-liquid separation with self-cleaning and reuse, and intelligent adaptive control of multiple parameters. These shortcomings include uneven gas-liquid distribution, limited mass transfer efficiency, fine carbonate crystallization, difficult product separation, equipment clogging, and poor adaptability to various operating conditions. The entire system is compact, highly integrated, and has a clear operating logic, enabling continuous, stable, and efficient closed-loop production for the resource utilization and carbon dioxide mineralization and storage of calcium-containing solid waste.

[0084] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the protection scope of the present invention.

Claims

1. A curing system for a calcium-containing leachate, characterized in that, The curing system includes: A reactor having a vertically arranged reaction chamber inside, the top of which is connected to an exhaust pipe; A stirring assembly is disposed within the reaction chamber. The stirring assembly includes a stirring shaft, a stirring blade structure, and a gas supply blade structure. The stirring shaft is vertically arranged and can rotate around its own axis. The gas supply blade structure is disposed at the bottom end of the stirring shaft. The stirring blade structure is disposed on the stirring shaft and located above the gas supply blade structure. The gas supply blade structure can spray carbon dioxide gas. A liquid supply assembly, comprising a liquid supply line for supplying a calcium-containing leachate, the liquid supply line being connected to the reaction chamber and disposed near the top of the reaction chamber; The gas supply assembly includes a main gas supply pipeline, an auxiliary gas supply pipeline, and a blade gas supply pipeline for supplying carbon dioxide gas. The main gas supply pipeline and the auxiliary gas supply pipeline are both connected to the reaction chamber. The main gas supply pipeline is located near the bottom of the reaction chamber. The auxiliary gas supply pipeline is located between the liquid supply pipeline and the gas supply pipeline. The blade gas supply pipeline is connected to the gas supply blade structure. The discharge assembly includes a discharge pipeline and a solid-liquid separation device. The two ends of the discharge pipeline are respectively connected to the bottom end of the reaction chamber and the solid-liquid separation device. The discharge pipeline is used to discharge a solid slurry containing calcium carbonate crystals, and the solid-liquid separation device is used to separate the calcium carbonate crystals and clear liquid from the solid slurry. The curing system further includes a clear liquid recovery component, which includes a gas-liquid separator, a clear liquid collection tank, and a first recovery pipeline. The gas-liquid separator is located at the top of the reaction chamber, and the clear liquid collection tank is located below the gas-liquid separator and is used to collect the clear liquid separated by the gas-liquid separator. The first recovery pipeline is connected to the clear liquid collection tank.

2. The curing system for the calcium-containing leachate as described in claim 1, characterized in that, The curing system also includes a slurry circulation component, which includes a circulation pipeline. Both ends of the circulation pipeline are connected to the reaction chamber, and the two ends of the circulation pipeline are respectively located near the bottom end of the reaction chamber and the middle area of ​​the reaction chamber. A circulation pump is installed on the circulation pipeline.

3. The curing system for the calcium-containing leachate as described in claim 2, characterized in that, An overflow weir is provided between the clear liquid collection tank and the first recovery pipeline.

4. The curing system for the calcium-containing leachate as described in claim 1, characterized in that, The reaction chamber is also equipped with a gas supply distribution pipe, which is connected to the main gas supply pipeline and extends horizontally. Multiple gas supply ports are spaced apart on the gas supply distribution pipe along its extension direction.

5. The curing system for the calcium-containing leachate as described in claim 4, characterized in that, All the gas supply ports on the gas supply distribution pipe are arranged facing downwards, and each gas supply port is connected to a downward-arranged conduit.

6. The curing system for the calcium-containing leachate as described in any one of claims 1 to 5, characterized in that, The main air supply line, the auxiliary air supply line, and the blade air supply line are all equipped with regulating valves.

7. The curing system for the calcium-containing leachate as described in claim 6, characterized in that, The solid-liquid separation device is also connected to a second recovery pipeline, on which a pH detection unit is installed. The pH detection unit and all the regulating valves are electrically connected to a controller.

8. The curing system for the calcium-containing leachate as described in claim 7, characterized in that, A carbon dioxide gas analysis unit is installed on the exhaust pipe, and the carbon dioxide gas analysis unit is electrically connected to the controller.

9. The curing system for the calcium-containing leachate as described in any one of claims 1 to 5, characterized in that, The gas supply assembly includes a plurality of auxiliary gas supply lines arranged at vertical intervals, and the plurality of auxiliary gas supply lines are located between the liquid supply line and the main gas supply line.

10. The curing system for the calcium-containing leachate as described in any one of claims 1 to 5, characterized in that, The stirring assembly includes a plurality of stirring blade structures arranged vertically at intervals, and the plurality of stirring blade structures are all disposed above the air supply blade structure.

11. The curing system for the calcium-containing leachate as described in any one of claims 1 to 5, characterized in that, The bottom of the reaction chamber is funnel-shaped, gradually narrowing from top to bottom.

12. The curing system for the calcium-containing leachate as described in any one of claims 1 to 5, characterized in that, The stirring shaft is a hollow stirring shaft, and the air supply blade structure includes air supply blades arranged at the bottom of the stirring shaft. Multiple air supply nozzles are formed on each air supply blade, and the blade air supply pipeline and all the air supply nozzles are connected to the stirring shaft.

13. A method for solidifying a calcium-containing leachate, characterized in that, The curing method for the calcium-containing leachate uses a curing system for the calcium-containing leachate as described in any one of claims 1 to 12.

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