Energy-saving calcium hydroxide continuous production device

Abstract

The invention relates to the technical field of calcium hydroxide production, in particular to an energy-saving calcium hydroxide continuous production device which comprises a primary digester, a secondary digester, a filtering device and a main treatment device which are connected in sequence. A feeding device is arranged at an inlet of the primary digester, an outlet of the primary digester is communicated to the top of the secondary digester through a filtering device, and an outlet of the secondary digester is connected with the filtering device again; a filtrate outlet is formed in the bottom of the filtering device, and the top is connected into the main treatment device through a material conveying pipe with an auxiliary material adding port and a connecting pipeline. A spiral conveyor is arranged in a treatment barrel of the main treatment device, a plurality of gas distributors are arranged on a driving shaft of the main treatment device and are communicated with a gas supply device, and a spiral material pushing piece on the driving shaft is used for pushing and stirring materials; the output end of the spiral conveyor is connected with the discharging device. According to the invention, the whole-course continuity of calcium hydroxide production is realized, and the method has the remarkable advantages of high energy-saving efficiency and stable product quality.

Description

Technical Field

[0001] This invention relates to the field of calcium hydroxide production technology, specifically an energy-saving continuous calcium hydroxide production device. Background Technology

[0002] Calcium hydroxide, as an important industrial raw material, is widely used in environmental protection, chemical synthesis, building materials, food, and pharmaceuticals. Traditional calcium hydroxide production processes mainly employ a batch digestion method, where quicklime and water are mixed in batches in a digestion tank, relying on natural reaction to complete the digestion process. This traditional process has several inherent drawbacks: First, batch operation leads to low production efficiency, high energy consumption, and difficulty in controlling the reaction process; second, due to uneven mixing and unstable reaction conditions, incomplete digestion often occurs, producing a large number of unreacted "stiff ash" particles, severely affecting product quality and activity. Summary of the Invention

[0003] The purpose of this invention is to provide an energy-saving continuous calcium hydroxide production apparatus to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] An energy-saving continuous calcium hydroxide production apparatus includes a primary digester, a secondary digester, a filtration device, and a main processing device connected in sequence. The primary digester is equipped with a feeding device at its inlet end. Its distinguishing feature is:

[0006] The main processing device includes a processing cylinder and a drive motor. A screw conveyor is installed inside the processing cylinder and is configured to be driven by the drive motor to transport materials.

[0007] The screw conveyor includes a hollow drive shaft and a screw pusher mounted on the drive shaft. The input end of the drive shaft is provided with a feed port that is connected to a connecting pipe from a filter device. Several gas distributors are provided on the pipe wall of the drive shaft.

[0008] The device also includes a gas supply device disposed on the main processing unit, the gas supply device being connected to the gas distributor via a gas delivery pipe.

[0009] As a further aspect of the present invention: the gas supply device includes a gas container and a spiral cooling pipe coiled around the outside of the gas container, and the output end of the spiral cooling pipe is connected to the gas delivery pipe through a connection interface.

[0010] As a further aspect of the present invention: the stirring shaft of the spiral pusher is driven to the drive shaft via a coupling, and stirring blades are provided on the stirring shaft.

[0011] As a further embodiment of the present invention: the output end of the screw conveyor is connected to a discharge device, the input end of the discharge device is provided with a screening chamber, the screening chamber is provided with a grading screen, and the end of the stirring shaft of the screw pusher extends into the screening chamber and is constructed into a conical structure that facilitates material grading.

[0012] As a further aspect of the present invention, the discharge device is also equipped with a pressure monitoring device.

[0013] As a further aspect of the present invention: the top of the inner cavity of the secondary digester is provided with a dividing cone, which divides the inner cavity into an upper reaction chamber and a lower reaction chamber, and forms a discharge channel with the bottom; the inlet side of the discharge channel is provided with a swinging material distribution mechanism for uniform material distribution, and the outlet side is provided with a crushing mechanism for crushing materials.

[0014] As a further aspect of the present invention: the swinging fabric mechanism includes a swinging plate that is swingably mounted in the upper reaction chamber, the swinging plate being connected to a swinging support shaft, the swinging support shaft being driven by a rotational driver located outside the secondary digester; the swinging fabric mechanism is integrally mounted on a swinging push cylinder so as to drive it to move in the horizontal direction through the swinging push cylinder.

[0015] As a further aspect of the present invention: the crushing mechanism includes a first drive shaft and a second drive shaft that are parallel to each other and staggered, the first drive shaft and the second drive shaft are driven by independent first drivers and second drivers respectively, and the first drive shaft and the second drive shaft are respectively provided with a first refining element and a second refining element that mesh with each other.

[0016] As a further aspect of the present invention: both the first refining component and the second refining component include a crushing roller and a plurality of outer rings sleeved thereon, the outer rings being provided with crushing teeth on their periphery; and the outer rings on the first refining component and the outer rings on the second refining component are staggered and arranged so that the crushing teeth on both sides are in an interlocking meshing state.

[0017] As a further embodiment of the present invention: the bottom of the filtration device is provided with a filtrate outlet, the top is provided with a material conveying pipe, and the material conveying pipe is provided with an auxiliary material addition port.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention constructs a highly integrated, multi-level collaborative continuous production system. Through structural innovation and process optimization, the screw conveyor is integrated into a gas-solid reaction core. Multiple gas distributors are integrated onto its drive shaft, along with a screw pusher that combines propulsion and powerful stirring functions. This allows the material to be continuously sheared and refreshed during transport, ensuring full contact with uniformly distributed gas. This achieves continuous and efficient transport, mixing, and modification reactions within a single device, significantly enhancing mass and heat transfer efficiency. The internal structure of the secondary digester utilizes partitioned conical hoppers to achieve zoned gradient digestion, combined with a unique oscillating material distribution mechanism to ensure uniform material distribution. A crushing mechanism consisting of independently driven, staggered meshing first and second refining components forcibly crushes the material at key stations. This collaborative mechanism of "uniform material distribution - gradient digestion - forced crushing" effectively solves the "stiff ash" problem, ensuring the thoroughness of the digestion reaction and significantly improving product activity and uniformity.

[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Furthermore, these drawings and textual descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to specific embodiments.

[0022] Figure 1 This is a schematic diagram of the overall structure of the energy-saving continuous calcium hydroxide production device provided in an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the internal structure of the main processing device provided in an embodiment of the present invention.

[0024] Figure 3 This is a side-view cross-sectional structural diagram of the main processing device provided in an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the structure of the spiral pusher provided in an embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of the structure of the docking area between the spiral pusher and the cone hopper provided in an embodiment of the present invention.

[0027] Figure 6 This is a schematic diagram of the upper cross section of a two-stage digester provided in an embodiment of the present invention.

[0028] Figure 7This is a schematic diagram of the crushing mechanism provided in an embodiment of the present invention.

[0029] Figure 8 For the present invention Figure 7 A magnified view of region a in the middle.

[0030] In the diagram: 11. Primary digester; 12. Feeding device; 13. Secondary digester; 131. Dividing cone; 132. Upper reaction chamber; 133. Lower reaction chamber; 134. Discharge channel; 14. Filtering device; 15. Filtrate outlet; 16. Material conveying pipe; 17. Auxiliary material addition port; 18. Connecting pipe; 2. Main processing unit; 21. Drive motor; 22. Processing cylinder; 23. Equipment support; 24. Product outlet; 3. Screw conveyor; 31. Drive shaft; 32. Feeding interface; 33. Gas distributor; 331. Gas inlet; 332. Sealing ring; 333. Connecting pipe; 34. Screw pusher; 341. Stirring shaft; 342. Stirring blades; 343. Coupling; 35. Screw shaft; 36. Screw 4. Gas supply device; 41. Spiral cooling pipe; 42. Gas container; 43. Connection interface; 44. Gas conveying pipe; 5. Discharge device; 51. Pressure monitoring device; 52. Discharge port; 53. Conveying pipeline; 54. Final outlet; 55. Feed cone; 56. Screening chamber; 57. Screen cavity; 58. Grading screen; 6. Crushing mechanism; 61. First driver; 62. Second driver; 63. First drive shaft; 64. Second drive shaft; 65. First refining component; 66. Second refining component; 67. Crushing roller; 68. Outer ring; 69. Crushing teeth; 7. Oscillating material distribution mechanism; 71. Oscillating support shaft; 72. Oscillating plate; 74. Rotary driver; 75. Oscillating pushing cylinder; 76. Mounting hole. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, examples of which are illustrated in the drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or identical elements.

[0032] Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0034] In one embodiment, see Figures 1-3This invention provides an energy-saving continuous calcium hydroxide production apparatus. Starting in the primary digester 11, quicklime raw material is precisely added through the feed device 12 at its inlet end and mixed with metered process water, resulting in a vigorous exothermic digestion reaction. The resulting slurry is pumped to the filter device 14 for preliminary solid-liquid separation. The separated filtrate is discharged from the system through the filtrate outlet 15 at the bottom, while the solid material with reduced moisture content is conveyed to the top inlet of the secondary digester 13. Inside the secondary digester 13, the material undergoes deep aging and complete digestion. The fully digested material then re-enters the filter device 14 for final dehydration, and the resulting loose powdered calcium hydroxide is output through the top material conveying pipe 16. During this conveying stage, surface treatment agents and other auxiliary materials can be uniformly added through the auxiliary material addition port 17 on the pipeline, according to product design requirements. Afterward, the material is introduced into the processing cylinder 22 of the main processing unit 2 via the connecting pipe 18. Here, the screw conveyor 3 integrated into the cylinder undertakes multiple tasks of material conveying, mixing, and reaction: the drive motor 21 drives the screw pusher 34 to rotate via the drive shaft 31, stably pushing the material towards the outlet and achieving strong stirring in the process; at the same time, the gas supply device 4 installed on the equipment support 23 continuously pumps process gas to multiple gas distributors 33 that run through the pipe of the drive shaft 31 through the connecting pipeline, so that the gas can be evenly diffused and penetrated into the material bed being conveyed and stirred. Finally, the finished product that has completed all processing steps is discharged from the discharge device 5 at the end of the screw conveyor 3 and collected and packaged through the product outlet 24 at the output end of the processing cylinder 22.

[0035] In the start-up phase, quicklime raw material is stably added to the primary digester 11 through the feeding device 12. After mixing with an appropriate amount of process water, it undergoes a vigorous reaction to generate calcium hydroxide and release a large amount of steam. The slurry formed in this process is immediately introduced into the filtration device 14 for dewatering. The material after preliminary dewatering is then sent to the top of the secondary digester 13, where a complete digestion reaction is completed. The fully digested material returns to the filtration device 14 for final dewatering, transforming it into a dry, loose powder. This powder is transported to the subsequent processing section through the material conveying pipe 16. During the conveying process, the auxiliary material addition port 17 can precisely inject the required additives. Subsequently, the material enters the screw conveyor 3 of the main processing unit 2 through the connecting pipe 18. Here, the rotating screw pusher 34 simultaneously performs conveying and stirring functions, continuously pushing, shearing, and turning the material to form a highly mixed state. At the same time, process gas from the gas supply device 4 is evenly distributed throughout the dynamic material flow through the gas distributor 33. The gas fully contacts the constantly renewing material particles, completing the set chemical reaction or physical process. The processed final product is continuously discharged from the product outlet 24 at the end of the system.

[0036] The multi-stage deep digestion principle is embodied in decomposing the traditional single digestion process into two stages: the vigorous reaction in the primary digester 11 and the gentle aging in the secondary digester 13, with dehydration and material state regulation through the filtration device 14 in between. This design not only utilizes the residual heat of the primary reaction to maintain the required ambient temperature in the secondary digester 13, achieving energy cascade utilization, but more importantly, by controlling the operating conditions of the secondary digester 13, it provides optimal conditions for the crystal transformation and growth of calcium hydroxide. The dynamic integrated gas-solid reaction principle is the core innovation of this invention, integrating the material conveying, mixing, and gas-solid reaction process into a single device: the screw conveyor 3. The screw pusher 34 has a dual function: on the one hand, it acts as a propeller to convey materials, and on the other hand, it acts as a powerful agitator to break up the agglomeration of materials and continuously renew the material surface. This design greatly enhances the mass transfer efficiency between the gas and solid phases. Combined with the gas distributor 33 arranged at multiple points along the axial direction, it ensures that the gas can uniformly contact the material throughout the entire reaction path, achieving efficient and uniform modification treatment under continuous operation.

[0037] This embodiment significantly reduces the demand for external energy supply through the multi-stage design of the primary digester 11 and the secondary digester 13, as well as the internal recovery and utilization of reaction heat. Simultaneously, integrating the conveying and reaction processes into a single screw conveyor 3 simplifies the equipment structure, reduces the heat dissipation area, and further reduces heat loss. Secondly, it achieves a substantial improvement in product quality. The secondary digester 13 ensures complete reaction and high activity of the materials, while the integrated screw conveyor 34 ensures the stability of material conveying and, through its stirring action, ensures that the gas released from the gas distributor 33 undergoes uniform and thorough modification treatment with the materials, resulting in a product with higher purity and more stable physicochemical properties. Thirdly, production efficiency achieves a qualitative leap. The continuous and automated operation of the entire process from the feeding device 12 to the product outlet 24 eliminates non-productive time in intermittent production, significantly increasing output per unit time, making it highly suitable for large-scale industrial production. The system adopts a closed design, which effectively prevents the spread of dust during the production process. At the same time, the filtrate discharged from the filtrate outlet 15 of the filter device 14 can be centrally treated or recycled, reducing wastewater discharge and conforming to the modern industrial concept of green production.

[0038] Example 2, please refer to Figure 2 and Figure 3 Based on the basic structure of Embodiment 1, this embodiment further optimizes the detailed configuration of the device.

[0039] The screw conveyor 3 is equipped with a discharge device 5 at its tube output end. This discharge device 5 has a pressure monitoring device 51 and a discharge port 52 at its bottom, connected to a final outlet 54 via a conveying pipe 53. The final outlet 54 is connected to the product outlet 24 of the main processing unit 2. The gas supply device 4 specifically includes a gas container 42 and a spiral cooling pipe 41 tightly wound around its outer ring. The output end of the spiral cooling pipe 41 is connected to an external gas conveying pipe 44 via a connection interface 43. The core components of the screw conveyor 3 include a screw shaft 35 and a screw pusher 34 mounted on it. The gas distributor 33 is sleeved around the screw shaft 35 and includes a gas inlet 331 and a sealing ring 332 that fits tightly against the screw shaft 35. The gas inlet 331 is connected to the gas conveying pipe 44 via a connecting pipe 333. The input end of the discharge device 5 is provided with a feeding cone 55, on which a screening chamber 56 is installed. The screening chamber 56 is provided with a screen cavity 57. The end of the spiral pusher 34 extends into the screen cavity 57, and a grading screen 58 is installed in the screen cavity 57.

[0040] After being propelled by the screw conveyor 34 and treated by the gas distributor 33 within the screw conveyor 3, the material first enters the feed cone 55 of the discharge device 5. Here, after initial aggregation, the material enters the screening chamber 56. The rotational motion at the end of the screw conveyor 34 generates a certain axial thrust on the material, causing it to be evenly distributed on the surface of the grading screen 58. Fine particles meeting the particle size requirements pass through the grading screen 58 and are discharged through the discharge port 52, conveying pipe 53, and final outlet 54; any coarse particles or agglomerates are retained and broken down or redispersed under the continuous action of the screw conveyor 34. Throughout the process, the pressure monitoring device 51 monitors the pressure status inside the discharge device 5 in real time, providing crucial parameters for stable system operation. Simultaneously, the spiral cooling pipe 41 in the gas supply device 4 continuously cools the process gas in the gas container 42, ensuring that the gas entering the gas distributor 33 is at the optimal reaction temperature.

[0041] In this embodiment, the pressure monitoring device 51 installed on the discharge device 5 enables real-time monitoring of the system back pressure. This provides a crucial guarantee for maintaining a stable gas-solid reaction environment within the screw conveyor 3, ensuring the controllability and reproducibility of the reaction conditions. The active cooling treatment of the process gas by the spiral cooling pipe 41 can precisely control the reaction temperature and avoid the adverse effects of local overheating on product quality. In the product processing stage, the grading screen 58 integrated in the discharge device 5 cooperates with the end of the screw pusher 34, which has propulsion and stirring functions, to form a dynamic grading system. The screw pusher 34 not only transports materials, but its end movement also prevents screen blockage and redisperses slightly agglomerated materials online, ensuring that the final product has a strictly controllable particle size distribution.

[0042] The introduction of pressure monitoring device 51 enhances the monitoring capability of the production process, which is conducive to the precise control of process parameters and the stability of product quality. Secondly, the design of spiral cooling pipe 41 significantly improves the thermal management capability of gas supply device 4, ensuring that process gas participates in the reaction in the best condition and avoiding side reactions or product deterioration caused by improper gas temperature. Thirdly, the conveying and stirring function of spiral pusher 34 and the sorting function of grading screen 58 are cleverly combined in the discharge device 5, realizing online grading and sorting of products, eliminating the need for subsequent independent screening processes, simplifying the process, improving efficiency, and directly ensuring the excellent and uniform particle size characteristics of the finished product. These improvements work together to significantly improve the accuracy, stability, and final product quality of this device.

[0043] Example 3, please refer to Figures 2-5 Based on the configurations of Embodiments 1 and 2, and the integrated design of the screw conveyor 3 and the discharge device 5, this embodiment further optimizes its internal structure. The screw pusher 34 includes a stirring shaft 341 and multiple stirring blades 342 fixedly mounted thereon. The input end of the stirring shaft 341 is driven by a coupling 343 to the drive shaft 31, ensuring synchronous operation with the screw conveyor 3. A feed cone 55 is provided at the input end of the discharge device 5, and a screening chamber 56 is installed above the cone. The screening chamber 56 forms a screen cavity 57, in which a grading screen 58 is installed. In particular, the output end of the stirring shaft 341 is designed as a conical structure and extends directly into the screen cavity 57, with its conical end maintaining an appropriate gap with the grading screen 58.

[0044] After being conveyed by the screw conveyor 34 and processed by the gas distributor 33 in the screw conveyor 3, the material first enters the feed cone 55 of the discharge device 5. Here, the material gathers and evenly enters the screen cavity 57 of the screening chamber 56. At this time, the continuously rotating stirring shaft 341 drives its end cone structure to rotate above the grading screen 58. The centrifugal force generated by the cone structure evenly throws the material to the periphery of the screen. Qualified fine particles pass through the grading screen 58 under the pushing action of the stirring blades 342 and enter the discharge port 52; while coarse particles or agglomerated materials that do not meet the particle size requirements are trapped on the screen surface and continuously stirred and broken by the cone structure at the end of the stirring shaft 341 until they meet the particle size requirements and pass through the screen.

[0045] The unique conical structure at the end of the stirring shaft 341 extends into the screen cavity 57, serving two key functions: First, the rotation of the conical structure generates a uniformly distributed centrifugal force field, ensuring even distribution of materials on the screen surface and preventing material accumulation in traditional screening. Second, the combination of the conical structure and the stirring blades 342 creates continuous shearing and crushing action, effectively breaking up material agglomerates while preventing screen clogging. This design, which organically integrates dynamic stirring and mechanical screening, achieves continuous and efficient screening processes.

[0046] Example 4, please refer to Figure 7 and Figure 8 Based on the above embodiments, this embodiment has specifically optimized the internal structure of the secondary digester 13.

[0047] The secondary digester 13 has a dividing cone 131 at the top of its inner cavity, which clearly divides the inner cavity into an upper reaction chamber 132 and a lower reaction chamber 133. The dividing cone 131 has an inverted bucket-shaped structure, forming a concentrated discharge channel 134 between its apex and bottom regions. A crushing mechanism 6 is provided on the outlet side of the discharge channel 134, and a oscillating feeding mechanism 7 is provided on its inlet side. The crushing mechanism 6 includes a first drive shaft 63 and a second drive shaft 64 installed parallel and offset inside the cylinder. The two shafts are independently driven by a first driver 61 and a second driver 62 outside the cylinder, respectively. A first abrasive element 65 is installed on the first drive shaft 63, and a second abrasive element 66 is installed on the second drive shaft 64. The two are meshed with each other. The swing fabric mechanism 7 includes a swing support shaft 71 that passes through the mounting hole 76 in the cylinder wall and a swing plate 72 fixed thereon. The swing support shaft 71 is driven by a rotary driver 74. The entire mechanism is mounted on a swing push cylinder 75 on the outside of the secondary digester 13 to achieve horizontal movement.

[0048] After entering the upper reaction chamber 132 of the secondary digester 13 from the filter device 14, the material first falls onto the swing plate 72 of the swinging cloth mechanism 7. The rotary driver 74 drives the swing support shaft 71 to rotate reciprocally, causing the swing plate 72 to swing, evenly and loosely distributing the material in the upper reaction chamber 132 for preliminary digestion. Subsequently, the material is collected through the separating cone hopper 131 and falls through the discharge channel 134. At this time, the first driver 61 and the second driver 62 of the crushing mechanism 6 drive the first transmission shaft 63 and the second transmission shaft 64 to rotate in opposite directions, causing the first refining element 65 and the second refining element 66 to mesh at high speed. When the falling material passes through this meshing area, it is subjected to shearing, compression and impact, and is effectively crushed and refined. The refined material enters the lower reaction chamber 133 to complete the final deep digestion reaction. After the reaction is complete, it is sent back to the filter device 14 for dehydration.

[0049] The core technology of this embodiment lies in "zonal digestion" and "dynamic material distribution-crushing synergy". The dividing cone 131 divides the secondary digester 13 into a functionally defined upper reaction chamber 132 and a lower reaction chamber 133, realizing gradient digestion of materials, avoiding backmixing, and ensuring the controllability and thoroughness of the digestion process. The oscillating material distribution mechanism 7, through its combined oscillating and translational motion, breaks up the accumulation and central funnel flow formed by the natural fall of materials due to gravity, achieving uniform material distribution over a larger cross-section. This ensures sufficient and uniform contact between the material and the steam environment in the early stages of digestion, improving thermal energy utilization and initial reaction efficiency. The crushing mechanism 6, through the precise engagement of two independently driven refining components at the discharge channel 134, forcibly breaks up any reaction shells or slight agglomerates that may form. This not only ensures the particle size of the material, but more importantly, it breaks up the incompletely reacted core, exposing fresh surfaces and creating decisive conditions for the material to enter the lower reaction chamber 133 for more thorough deep digestion.

[0050] This embodiment solves the problem of incomplete digestion caused by "stiff ash" or reaction shell, physically ensuring the high reactivity of the product. The gradient digestion mode guided by the partition cone 131 makes the reaction process more orderly and controllable. The synergistic effect of these three factors ensures that the conversion rate of calcium oxide to calcium hydroxide is near complete, the product has high activity and uniform particle size, and the efficiency and stability of the entire secondary digestion process are also greatly improved.

[0051] 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 the spirit or essential characteristics of the invention. 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, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0052] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An energy-saving continuous production apparatus for calcium hydroxide, comprising a primary digester (11), a secondary digester (13), a filtration device (14), and a main processing device (2) connected in sequence, wherein the primary digester (11) is provided with a feeding device (12) at its inlet end, characterized in that: The main processing device (2) includes a processing cylinder (22) and a drive motor (21). A screw conveyor (3) is provided inside the processing cylinder (22). The screw conveyor (3) is configured to be driven by the drive motor (21) to transport materials. The screw conveyor (3) includes a hollow drive shaft (31) and a screw pusher (34) disposed on the drive shaft (31). The input end of the drive shaft (31) is provided with a feed port (32) connected to the connecting pipe (18) from the filter device (14). Several gas distributors (33) are disposed on the pipe wall of the drive shaft (31). The device also includes a gas supply device (4) disposed on the main processing device (2), the gas supply device (4) being connected to the gas distributor (33) via a gas delivery pipe (44).

2. The energy-saving continuous calcium hydroxide production apparatus according to claim 1, characterized in that: The gas supply device (4) includes a gas container (42) and a spiral cooling pipe (41) coiled around the outside of the gas container (42). The output end of the spiral cooling pipe (41) is connected to the gas delivery pipe (44) through a connection interface (43).

3. The energy-saving continuous calcium hydroxide production apparatus according to claim 1, characterized in that: The stirring shaft (341) of the spiral pusher (34) is driven to the drive shaft (31) via a coupling (343), and stirring blades (342) are provided on the stirring shaft (341).

4. The energy-saving continuous calcium hydroxide production apparatus according to claim 3, characterized in that: The output end of the screw conveyor (3) is connected to a discharge device (5), and the input end of the discharge device (5) is provided with a screening chamber (56). A grading screen (58) is provided in the screening chamber (56). The end of the stirring shaft (341) of the screw pusher (34) extends into the screening chamber (56) and is constructed into a conical structure that helps the material to be graded.

5. The energy-saving continuous calcium hydroxide production apparatus according to claim 4, characterized in that: The discharge device (5) is also equipped with a pressure monitoring device (51).

6. The energy-saving continuous calcium hydroxide production apparatus according to claim 1, characterized in that: The inner cavity of the secondary digester (13) is provided with a dividing cone (131) at the top, which divides the inner cavity into an upper reaction chamber (132) and a lower reaction chamber (133), and forms a discharge channel (134) with the bottom; the inlet side of the discharge channel (134) is provided with a swinging material distribution mechanism (7) for uniform material distribution, and the outlet side is provided with a crushing mechanism (6) for crushing materials.

7. The energy-saving continuous calcium hydroxide production apparatus according to claim 6, characterized in that: The swing fabric mechanism (7) includes a swing plate (72) that is swingably mounted in the upper reaction chamber (132). The swing plate (72) is connected to a swing support shaft (71), which is driven by a rotation driver (74) located outside the secondary digester (13). The swing fabric mechanism (7) is mounted on a swing push cylinder (75) so that it can be driven to move in the horizontal direction by the swing push cylinder (75).

8. The energy-saving continuous calcium hydroxide production apparatus according to claim 6, characterized in that: The crushing mechanism (6) includes a first drive shaft (63) and a second drive shaft (64) that are parallel to each other and staggered. The first drive shaft (63) and the second drive shaft (64) are driven by independent first drivers (61) and second drivers (62), respectively. The first drive shaft (63) and the second drive shaft (64) are respectively provided with a first refining member (65) and a second refining member (66) that mesh with each other.

9. The energy-saving continuous calcium hydroxide production apparatus according to claim 8, characterized in that: The first refining component (65) and the second refining component (66) both include a crushing roller (67) and a plurality of outer rings (68) sleeved thereon. The outer rings (68) are provided with crushing teeth (69) on their periphery. Furthermore, the outer rings (68) on the first refining component (65) and the outer rings (68) on the second refining component (66) are staggered and arranged so that the crushing teeth (69) on both sides are in an interlocking meshing state.

10. The energy-saving continuous calcium hydroxide production apparatus according to claim 1, characterized in that: The filter device (14) has a filtrate outlet (15) at the bottom and a material conveying pipe (16) at the top, and an auxiliary material addition port (17) is provided on the material conveying pipe (16).

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