Continuous high-strength gypsum slurry separating and drying system

Abstract

The invention belongs to the technical field of high-pressure slurry solid-liquid separation, and discloses a continuous high-strength gypsum slurry separation and drying system. The continuous high-strength gypsum slurry separation and drying system comprises a material blending unit, a hydrothermal reaction unit, a solid-liquid separation unit, a depressurization material conveying unit, a flash evaporation unit and a drying unit which are sequentially connected in series, homogeneous reaction raw materials blended by the material blending unit are subjected to hydrothermal reaction in the hydrothermal reaction unit to generate high-pressure slurry; the high-pressure slurry sequentially enters a solid-liquid separation unit, a depressurization conveying unit and a flash evaporation unit to be subjected to step-by-step solid-liquid separation and then is dried in a drying unit, and alpha-type calcium sulfate hemihydrate is obtained; the liquid phase discharge ends of the solid-liquid separation unit, the flash evaporation unit and the drying unit are all communicated with the material blending unit so as to realize the cyclic utilization of the liquid phase. The continuous high-strength gypsum slurry separating and drying system can effectively improve the quality of alpha-type calcium sulfate hemihydrate, is simple to operate and low in energy consumption, and can effectively promote resource utilization of industrial solid waste.

Description

Technical Field

[0001] The invention relates to the technical field of high-pressure slurry solid-liquid separation, and in particular to a continuous high-strength gypsum slurry separation and drying system. Background Art

[0002] Desulfurization gypsum is a by-product of the flue gas desulfurization process in power plants and is widely used in mud products, fertilizers, ceramics and glass products, construction and soil improvement.

[0003] At present, the main way to recycle desulfurized gypsum is to prepare calcium sulfate hemihydrate. Calcium sulfate hemihydrate mainly includes α-type calcium sulfate hemihydrate and β-type calcium sulfate hemihydrate. Since β-type calcium sulfate hemihydrate has a higher porosity and a lower strength value, the economic benefits are poor. Therefore, the current resource utilization of desulfurized gypsum in this field is mainly to convert it into α-type calcium sulfate hemihydrate.

[0004] In the prior art, the subcritical hydrothermal method is mainly used to upgrade the desulfurized gypsum into high-value α-type hemihydrate calcium sulfate. However, since the product obtained by the subcritical hydrothermal method is a high-pressure slurry, the high-value α-type hemihydrate calcium sulfate needs to be subjected to solid-liquid separation treatment, resulting in the need to use subcritical hydrothermal equipment and separation devices for hydrothermal treatment and solid-liquid separation treatment, respectively, resulting in inconvenience in operation. Moreover, the centrifugal separation devices used in the solid-liquid separation treatment in the prior art mainly include static separation tanks and centrifuges, etc., but since the α-type hemihydrate gypsum must be operated at high temperature during the separation process, in order to avoid vaporization, it is necessary to maintain high-pressure operation. Some of the existing separation devices cannot maintain high-temperature and high-pressure operation, and the α-type hemihydrate gypsum is prone to sedimentation and hardening. The static separation device is also not suitable for the separation of α-type hemihydrate gypsum and cannot be operated continuously. The main separation technologies include sedimentation, filtration, ion exchange, etc., and the temperature of 60℃~90℃ needs to be maintained during the drying process to prevent the product from deteriorating. However, the existing equipment and methods cannot solve the problems of α-type hemihydrate gypsum deposition and deterioration, and cannot continuously achieve high-pressure and high-temperature separation of high-pressure slurry. Summary of the invention

[0005] In order to solve the above technical problems, the α-type hemihydrate gypsum slurry can be continuously separated under high temperature and high pressure conditions, so the present invention provides a continuous high-strength gypsum slurry separation and drying system. The continuous high-strength gypsum slurry separation and drying system of the present invention comprises a material preparation unit, a hydrothermal reaction unit, a solid-liquid separation unit, a pressure reduction feeding unit, a flash unit and a drying unit connected in series in sequence; the homogeneous reaction raw materials prepared by the material preparation unit produce high-pressure slurry after hydrothermal reaction in the hydrothermal reaction unit; the high-pressure slurry enters the solid-liquid separation unit, the pressure reduction feeding unit and the flash unit in sequence for step-by-step solid-liquid separation and then is dried in the drying unit to obtain α-type hemihydrate calcium sulfate; the liquid phase discharge ends of the solid-liquid separation unit, the flash unit and the drying unit are all connected to the material preparation unit, thereby avoiding the phase transition of the α-type hemihydrate calcium sulfate in the high-pressure slurry during the separation process, while improving the quality of the α-type hemihydrate calcium sulfate, it also realizes the recycling of the liquid phase components and reduces energy consumption.

[0006] A continuous high-strength gypsum slurry separation and drying system of the present invention is realized by the following technical scheme:

[0007] The present invention provides a continuous high-strength gypsum slurry separation and drying system, comprising a material preparation unit, a hydrothermal reaction unit, a solid-liquid separation unit, a pressure reduction and feeding unit, a flash evaporation unit, a drying unit and a power unit.

[0008] In the present invention, the material preparation unit is used to receive the reaction materials of the desulfurized gypsum undergoing hydrothermal dechlorination and quality upgrading, and prepare the reaction materials of the desulfurized gypsum undergoing hydrothermal dechlorination into homogeneous reaction raw materials to improve the effect of the hydrothermal dechlorination and quality upgrading.

[0009] In the present invention, the feed end of the hydrothermal reaction unit is connected to the discharge end of the material preparation unit to receive the homogeneous reaction raw materials output from the material preparation unit, and the homogeneous reaction raw materials are subjected to a hydrothermal reaction in the hydrothermal reaction unit to achieve the hydrothermal dechlorination and quality improvement of the desulfurized gypsum to form α-type hemihydrate gypsum.

[0010] In the present invention, the feed end of the solid-liquid separation unit is connected to the discharge end of the hydrothermal reaction unit, so that the solid-liquid separation unit receives the high-pressure slurry output from the hydrothermal reaction unit, and then the solid-liquid separation unit performs preliminary separation of the high-pressure slurry to obtain preliminary separated dense phase slurry and liquid phase components. A pressure detection unit is provided on the solid-liquid separation unit to monitor the pressure change in the solid-liquid separation unit in real time through the pressure detection unit.

[0011] In the present invention, the power unit is used to provide separation power for the high-pressure slurry in the solid-liquid separation unit.

[0012] In the present invention, the feed end of the pressure reduction and feeding unit is connected to the thick phase slurry discharge end of the solid-liquid separation unit, and the pressure reduction and feeding unit is drivingly connected to the power unit, so that the pressure reduction and feeding unit receives the thick phase slurry after solid-liquid separation in the solid-liquid separation unit, and under the drive of the power unit, the thick phase slurry is transported and pressure-reduced, while maintaining the pressure in the solid-liquid separation unit.

[0013] In the present invention, the feed end of the flash evaporation unit is connected with the discharge end of the pressure reducing and feeding unit to receive the dense phase slurry output by the pressure reducing and feeding unit. On the basis of solid-liquid separation, the dense phase slurry is further subjected to flash evaporation separation treatment by the flash evaporation unit to further separate the liquid phase and the solid phase in the dense phase slurry, thereby improving the effect of solid-liquid separation.

[0014] In the present invention, the feed end of the drying unit is connected to the solid material discharge end of the flash unit to receive and dry the solid phase component output by the flash unit, and dry the solid phase component so that the free water content in the solid phase component is less than 3%.

[0015] In the present invention, the liquid phase discharge end of the solid-liquid separation unit, the liquid phase discharge end of the flash unit and the liquid phase discharge end of the drying unit are all connected to the liquid phase feed end of the material preparation unit through a liquid phase conveying pipeline to achieve the recycling of the liquid phase, thereby reducing the energy loss during the operation process.

[0016] In some preferred embodiments of the present invention, the power unit includes a rotating shaft, a driving motor and a telescopic module. The rotating shaft is vertically arranged in the solid-liquid separation unit, and the upper end of the rotating shaft is connected to the output end of the driving motor, and the lower end of the rotating shaft is drivingly connected to the upper end of the feeding blade. The telescopic module can be telescoped along the axial direction of the rotating shaft, and the upper end of the telescopic module is connected to the output end of the driving motor, and the telescopic module is interlocked with the pressure detection unit, and the driving motor can drive the rotating shaft to rotate, and the rotational force generated by the rotating shaft can prevent the blockage problem caused by the hydration and compaction of the high-pressure slurry in the solid-liquid separation unit; while the rotating shaft rotates, it can also drive the pressure reduction feeding unit to feed, stir and reduce pressure. In addition, the pressure detection unit is interlocked with the telescopic module to control the pressure in the solid-liquid separation unit. When the pressure in the solid-liquid separation unit detected by the pressure detection unit is too high, the telescopic module is controlled to contract through the drive motor to reduce the length of the pressure reduction and feeding unit used for pressure reduction, thereby slowing down the pressure reduction effect; when the pressure in the solid-liquid separation unit detected by the pressure detection unit is too low, the telescopic module is controlled to extend through the drive motor to increase the length of the pressure reduction and feeding unit to enhance the sealing.

[0017] In some preferred embodiments of the present invention, the pressure-reducing feeding unit includes a pressure-reducing feeding pipeline, a feeding blade and a pressure-reducing blade. Wherein, the two ends of the pressure-reducing feeding pipeline are respectively connected to the discharge end of the solid-liquid separation unit and the feed end of the flash unit, so that the dense phase slurry can be transported to the flash unit after pressure reduction treatment. And the feeding blade of the present invention is arranged inside the solid-liquid separation unit, which can prevent the material from being deposited and hardened in the tank body and causing blockage. And. The upper end of the feeding blade of the present invention is drivingly connected to the rotating shaft, and the pressure-reducing blade is coaxially arranged at the lower end of the feeding blade and is located in the pressure-reducing feeding pipeline, so that the feeding blade and the pressure-reducing blade can rotate with the rotation of the rotating shaft, so that the feeding blade can continuously discharge the material, and the pressure-reducing blade can control the output rate of the material, and can play a certain sealing role, so that the pressure reduction effect can be achieved by controlling the discharge speed, thereby improving the safety and reliability of the system operation.

[0018] In some preferred embodiments of the present invention, the continuous high-strength gypsum slurry separation and drying system further includes a radar level meter module, which is disposed at the upper end of the solid-liquid separation unit and is used to detect the height of the dense phase slurry in the solid-liquid separation unit. The radar level meter module is interlocked with the drive motor. When the radar level meter module detects that the height of the dense phase slurry in the solid-liquid separation unit is too high, the speed of the drive motor is increased to control the discharge amount; when the radar level meter module detects that the height of the dense phase slurry in the solid-liquid separation unit is too low, the speed of the drive motor is reduced.

[0019] In some preferred embodiments of the present invention, a slurry pump is provided between the feed end of the hydrothermal reaction unit and the discharge end of the material preparation unit, and the slurry pump is used to pump the homogeneous reaction raw materials in the material preparation unit into the hydrothermal reaction unit.

[0020] In some more preferred embodiments of the present invention, the slurry pump includes but is not limited to a screw pump and a centrifugal pump.

[0021] In some preferred embodiments of the present invention, the hydrothermal reaction unit includes but is not limited to a horizontal drum reaction device and a multi-stage reaction device.

[0022] In some preferred embodiments of the present invention, the reaction conditions set in the hydrothermal reaction unit are: a temperature range of 90° C. to 160° C., and a pressure range of 0.3 MPa to 1.5 MPa.

[0023] In some more preferred embodiments of the present invention, the liquid phase discharge end of the solid-liquid separation unit is connected to the liquid phase feed end of the material preparation unit through a first liquid phase recovery pipe, and a first back pressure valve is provided on the liquid phase recovery pipe. The first back pressure valve is used to maintain the separation pressure of the solid-liquid separation unit, and the separated liquid flows back to the material preparation unit to realize the recycling of the liquid phase components separated by the solid-liquid separation unit, thereby reducing the energy consumption of separation.

[0024] In some more preferred embodiments of the present invention, the liquid phase discharge end of the flash evaporation unit is connected to the liquid phase feed end of the material preparation unit through a liquid phase recovery pipe, and a second back pressure valve is provided on the liquid phase recovery pipe. The second back pressure valve is used to adjust the separation pressure of the flash evaporation unit, and the separated liquid is refluxed to the material preparation unit to realize the recycling of the liquid phase components separated by the flash evaporation unit, thereby further reducing the energy consumption of separation.

[0025] In some preferred embodiments of the present invention, the continuous high-strength gypsum slurry separation and drying system also includes a post-processing unit, which is connected to the solid phase discharge end of the drying unit so that the dried product can be further processed into an α-type calcium sulfate hemihydrate finished product through the post-processing unit.

[0026] In some more preferred embodiments of the present invention, the drying unit includes but is not limited to a rotary kiln dryer and a vacuum paddle dryer.

[0027] In some more preferred embodiments of the present invention, the flash unit is a flash tank with a built-in filter.

[0028] In some more preferred embodiments of the present invention, the post-processing unit includes but is not limited to a ball milling module and a packaging module.

[0029] In some preferred embodiments of the present invention, the continuous high-strength gypsum slurry separation and drying system also includes a heating unit, and the heat output end of the heating unit is respectively connected to the heat input end of the hydrothermal reaction unit and the heat input end of the drying unit through a heat transfer pipe to provide heat sources for the hydrothermal reaction unit and the drying unit, respectively.

[0030] In some more preferred embodiments of the present invention, the heating unit includes but is not limited to a biomass boiler and a coal-fired boiler.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The continuous high-strength gypsum slurry separation and drying system of the present invention comprises a material preparation unit, a hydrothermal reaction unit, a solid-liquid separation unit, a pressure-reducing feeding unit, a flash unit and a drying unit which are connected in series in sequence; the homogeneous reaction raw materials prepared by the material preparation unit undergo a hydrothermal reaction in the hydrothermal reaction unit to generate a high-pressure slurry; the high-pressure slurry sequentially enters the solid-liquid separation unit, the pressure-reducing feeding unit and the flash unit for step-by-step solid-liquid separation and is then dried in the drying unit to obtain α-type calcium sulfate hemihydrate; the liquid phase discharge ends of the solid-liquid separation unit, the flash unit and the drying unit are all connected to the material preparation unit, thereby avoiding the occurrence of a phase transition of the α-type calcium sulfate hemihydrate in the high-pressure slurry during the separation process, and while improving the quality of the α-type calcium sulfate hemihydrate, the recycling of the liquid phase components is also achieved, thereby reducing energy consumption.

[0033] The continuous high-strength gypsum slurry separation and drying system of the present invention can achieve high-pressure separation of the slurry by arranging a pressure-reducing feeding unit between the solid-liquid separation unit and the flash evaporation unit. The pressure-reducing feeding unit has a feeding function, which prevents the sedimentation and clogging of the slurry during the separation process and improves the safety and reliability of the system operation.

[0034] The liquid phase water separated by the present invention is returned to the material preparation unit for recycling, thereby reducing the energy and quality loss during the operation process.

[0035] The present invention uses water as the main solution, has no other additional dopants, and generates no additional secondary pollutants, thereby avoiding the occurrence of secondary pollution and improving environmental protection benefits.

[0036] The present invention adopts industrial waste gypsum and realizes resource utilization of industrial solid waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of the continuous high-strength gypsum slurry separation and drying system of the present invention; wherein, the red arrow indicates the direction of heat transport, the green arrow indicates the direction of liquid phase component transport, and the black arrow indicates the direction of solid phase component transport.

[0038] Figure 2 It is a structural schematic diagram of the telescopic module of the present invention.

[0039] Figure 3 It is a schematic structural diagram of the pressure-reducing feeding unit of the present invention.

[0040] Description of reference numerals:

[0041] 1. Heating unit; 2. Pressure monitoring unit; 3. Driving motor; 4. Telescopic unit; 5. First back pressure valve; 6. Radar level meter; 7. Rotating shaft; 8. Feeding paddle; 9. Solid-liquid separation unit; 10. Pressure reduction feeding unit; 11. Liquid phase recovery pipe; 12. Second back pressure valve; 13. Flash unit; 14. Post-processing unit; 15. Drying unit; 16. Hydrothermal reaction unit; 17. Slurry pump; 18. Material mixing unit; 19. Pressure reduction feeding pipe; 20. Pressure reduction feeding paddle. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be described clearly and completely below.

[0043] Example 1

[0044] See also Figure 1 The present embodiment provides a continuous high-strength gypsum slurry separation and drying system, including a material preparation unit 18, a hydrothermal reaction unit 16, a solid-liquid separation unit 9, a pressure reduction and feeding unit 10, a flash unit 13, a drying unit 15 and a power unit.

[0045] In this embodiment, the material preparation unit 18 is used to receive the reaction materials of the desulfurized gypsum undergoing hydrothermal dechlorination and quality upgrading, and prepare the reaction materials of the desulfurized gypsum undergoing hydrothermal dechlorination into homogeneous reaction raw materials to improve the effect of the hydrothermal dechlorination and quality upgrading.

[0046] In this embodiment, the feed end of the hydrothermal reaction unit 16 is connected to the discharge end of the material preparation unit 18, and the discharge end of the hydrothermal reaction unit 16 is connected to the feed end of the solid-liquid separation unit 9, so that the homogeneous reaction raw materials output from the material preparation unit 18 undergo hydrothermal reaction under the high temperature and high pressure conditions of the hydrothermal reaction unit 16 to achieve hydrothermal dechlorination and upgrading of desulfurized gypsum to form high-pressure slurry. The formed high-pressure slurry and the reaction residual pressure after the hydrothermal reaction unit 16 enter the solid-liquid separation unit 9 together, so that the high-pressure slurry achieves preliminary solid-liquid separation under the synergistic effect of the reaction residual pressure and the power provided by the power unit, and obtains preliminary separated dense phase slurry and liquid phase components.

[0047] See also Figure 1 and Figure 2In this embodiment, the power unit includes a rotating shaft 7, a driving motor 3 and a telescopic module 4. The rotating shaft 7 is vertically arranged in the solid-liquid separation unit 9, and the upper end of the rotating shaft 7 is connected to the telescopic module 4, and the lower end of the rotating shaft 7 is drivingly connected to the upper end of the pressure reduction feeding unit 10. The telescopic module 4 can be telescoped along the axial direction of the rotating shaft 7, and the upper end of the telescopic module 4 is connected to the output end of the driving motor 3, and the telescopic module 4 is interlocked with the pressure detection unit 2, so that the rotating shaft 7 can be driven to rotate by the driving motor 3, and the rotational force generated by the rotating shaft 7 can promote the solid-liquid separation of the high-pressure slurry in the solid-liquid separation unit 9; while the rotating shaft 7 rotates, it can also drive the pressure reduction feeding unit 10 to reduce the pressure. In addition, a pressure detection unit 2 is provided on the solid-liquid separation unit 9 to monitor the pressure changes in the solid-liquid separation unit 9 in real time through the pressure detection unit 2. The pressure detection unit 2 is interlocked with the telescopic module 4 to control the pressure in the solid-liquid separation unit 9. When the pressure in the solid-liquid separation unit 9 detected by the pressure detection unit 2 is too high, the telescopic module 4 is controlled to contract through the drive motor 3 to reduce the length of the pressure reduction and feeding unit 10 used for pressure reduction, thereby slowing down the pressure reduction effect; when the pressure in the solid-liquid separation unit 9 detected by the pressure detection unit 4 is too low, the telescopic module 4 is controlled to extend through the drive motor 3 to increase the length of the pressure reduction and feeding unit 10 to enhance the sealing.

[0048] See also Figure 1 and Figure 3 The depressurization and feeding unit 4 of this embodiment includes a depressurization and feeding pipeline 19, a feeding blade 8 and a depressurization and feeding blade 20. The two ends of the depressurization and feeding pipeline 19 are respectively connected to the discharge end of the solid-liquid separation unit 9 and the feed end of the flash unit 13, so that the dense phase slurry can be depressurized and then transported to the flash unit 13. The feeding blade 8 of the present invention is arranged inside the solid-liquid separation unit 9 to prevent the material from being deposited and compacted in the tank body and causing blockage. The upper end of the feed paddle 8 is drivingly connected to the rotating shaft 7, and the pressure-reducing feed paddle 20 is coaxially arranged at the lower end of the feed paddle 8 and is located in the pressure-reducing feed pipeline 19, so that the feed paddle 8 and the pressure-reducing feed paddle 20 can rotate with the rotation of the rotating shaft 7, so that the feed paddle 8 can discharge materials continuously, and the pressure-reducing feed paddle 20 can control the output rate of the material and can play a certain sealing role, so that high-pressure separation of the dense phase slurry can be achieved by controlling the discharge speed to form a pressure-reduced slurry, thereby improving the safety and reliability of the system operation.

[0049] In this embodiment, the feed end of the flash evaporation unit 13 is connected to the discharge end of the pressure reduction feeding unit 10 to receive the depressurized slurry output by the pressure reduction feeding unit 10. On the basis of the pressure reduction treatment, the depressurized slurry is further flash-separated by the flash evaporation unit 13 to further separate the liquid phase and the solid phase in the depressurized slurry, thereby improving the solid-liquid separation effect.

[0050] In this embodiment, the feed end of the drying unit 15 is connected to the solid material discharge end of the flash unit 13 to receive and dry the solid phase component output by the flash unit 13. The obtained solid phase component is the α-type calcium sulfate hemihydrate after the desulfurization gypsum is dechlorinated and upgraded by the hydrothermal method.

[0051] In this embodiment, the liquid phase discharge end of the solid-liquid separation unit 9, the liquid phase discharge end of the flash unit 13 and the liquid phase discharge end of the drying unit 15 are all connected to the liquid phase feed end of the material preparation unit 18 through a liquid phase conveying pipeline to achieve the recycling of the liquid phase, thereby reducing the energy loss during the operation process.

[0052] See also Figure 1 In a preferred embodiment of the present invention, the continuous high-strength gypsum slurry separation and drying system also includes a radar level meter module 6, which is arranged at the upper end of the solid-liquid separation unit 9 and is used to detect the height of the dense phase slurry in the solid-liquid separation unit 9.

[0053] See also Figure 1 In a preferred embodiment of the present invention, a slurry pump 2 is provided between the feed end of the hydrothermal reaction unit 16 and the discharge end of the material preparation unit 18. The slurry pump 2 is used to pump the homogeneous reaction raw materials in the material preparation unit 18 into the hydrothermal reaction unit 16. In a more preferred embodiment of the present invention, the slurry pump 2 includes but is not limited to a screw pump and a centrifugal pump.

[0054] In a more preferred embodiment of the present invention, the liquid phase discharge end of the solid-liquid separation unit 9 is connected to the liquid phase feed end of the material preparation unit 18 through a liquid phase recovery pipe 11, and a first back pressure valve 5 is provided on the liquid phase recovery pipe 11; the liquid phase discharge end of the flash unit 13 is connected to the liquid phase feed end of the material preparation unit 18 through a liquid phase recovery pipe 11, and a second back pressure valve 12 is provided on the liquid phase recovery pipe 11. Among them, the first back pressure valve 5 is used to maintain the pressure of the solid-liquid separation unit 9, and the second back pressure valve 15 is used to maintain the pressure of the Shenzhen unit 13, so as to realize the recycling of the liquid phase components separated by the solid-liquid separation unit 9 and the flash unit 13 through the first back pressure valve 5 and the second back pressure valve 12, thereby further reducing the energy consumption of separation.

[0055] In a preferred embodiment of the present invention, the continuous high-strength gypsum slurry separation and drying system also includes a post-processing unit 14, which is connected to the solid phase discharge end of the drying unit 15, so that the dried product can be further processed into an α-type calcium sulfate hemihydrate finished product through the post-processing unit 14.

[0056] In a more preferred embodiment of the present invention, the drying unit 14 includes but is not limited to a rotary kiln dryer and a vacuum paddle dryer.

[0057] In a more preferred embodiment of the present invention, the flash unit 13 is a flash tank with a built-in filter.

[0058] In a more preferred embodiment of the present invention, the post-processing unit 14 includes but is not limited to a ball milling module and a packaging module.

[0059] In a preferred embodiment of the present invention, the continuous high-strength gypsum slurry separation and drying system also includes a heating unit 1, and the heat output end of the heating unit 1 is respectively connected to the heat input end of the hydrothermal reaction unit 16 and the heat input end of the drying unit 15 through a heat transfer pipe to provide heat sources for the hydrothermal reaction unit 16 and the drying unit 15, respectively.

[0060] In a more preferred embodiment of the present invention, the heating unit 1 includes but is not limited to a biomass boiler and a coal-fired boiler.

[0061] In a preferred embodiment of the present invention, the hydrothermal reaction unit 16 includes but is not limited to a horizontal drum reaction device and a multi-stage reaction device.

[0062] In a preferred embodiment of the present invention, the reaction conditions set in the hydrothermal reaction unit 16 are: a temperature range of 90° C. to 160° C., and a pressure range of 0.3 MPa to 1.5 MPa.

[0063] Obviously, the above embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A continuous high-strength gypsum slurry separation and drying system, characterized in that: It comprises a material preparation unit (18), a hydrothermal reaction unit (16), a solid-liquid separation unit (9), a pressure reduction and material feeding unit (10), a flash evaporation unit (13), a drying unit (15) and a power unit; The material preparation unit (18) is used to prepare the material to be processed into a homogeneous reaction raw material; The feed end of the hydrothermal reaction unit (16) is connected to the discharge end of the material preparation unit (18) so that the homogeneous reaction raw materials can undergo hydrothermal reaction to obtain α-type hemihydrate gypsum; The feed end of the solid-liquid separation unit (9) is connected to the discharge end of the hydrothermal reaction unit (16) to perform solid-liquid separation on the high-pressure slurry output from the hydrothermal reaction unit (16); and a pressure detection unit (2) is provided on the solid-liquid separation unit (9); The power unit is used to stir the high-pressure slurry in the solid-liquid separation unit (9) to prevent hydration and blockage, and at the same time provide power for the discharge of the dense phase slurry; The feed end of the pressure-reducing and feeding unit (10) is in communication with the thick phase slurry discharge end of the solid-liquid separation unit (9), and the pressure-reducing and feeding unit (10) is drivingly connected to the power unit so as to reduce the pressure of the thick phase slurry after solid-liquid separation from the solid-liquid separation unit (9) under the drive of the power unit, so as to maintain the pressure in the separation tank; The feed end of the flash unit (13) is connected to the discharge end of the pressure-reducing and feeding unit (10) so as to perform flash separation treatment on the dense phase slurry output from the pressure-reducing and feeding unit (10); The feed end of the drying unit (15) is connected to the solid phase material discharge end of the flash evaporation unit (13) to receive and dry the solid phase components output by the flash evaporation unit (13); The liquid phase discharge end of the solid-liquid separation unit (9), the liquid phase discharge end of the flash unit (13) and the liquid phase discharge end of the drying unit (15) are all connected to the liquid phase feed end of the material preparation unit (18) through a liquid phase conveying pipeline to achieve liquid phase recycling.

2. The continuous high-strength gypsum slurry separation and drying system according to claim 1, characterized in that: The power unit comprises a rotating shaft (7), a driving motor (3) and a telescopic module (4); The rotating shaft (7) is vertically arranged in the solid-liquid separation unit (9), and the upper end of the rotating shaft (7) is connected to the telescopic module (4), and the lower end of the rotating shaft (7) is drivingly connected to the upper end of the pressure-reducing feeding unit (10); The upper end of the telescopic module (4) is connected to the output end of the drive motor (3), and the telescopic module (4) is interlocked with the pressure detection unit (2).

3. The continuous high-strength gypsum slurry separation and drying system according to claim 2, characterized in that: The pressure-reducing material conveying unit (10) comprises a pressure-reducing material conveying pipeline (19), a material conveying blade (8) and a pressure-reducing blade (20); The two ends of the pressure-reducing feed pipeline (19) are respectively connected to the discharge end of the solid-liquid separation unit (9) and the feed end of the flash unit (13); The feeding paddle (8) is arranged inside the solid-liquid separation unit (9), and the upper end of the feeding paddle (8) is drivingly connected to the rotating shaft (7); The pressure reducing blade (20) is coaxially arranged at the lower end of the material conveying blade (8) and is located in the pressure reducing material conveying pipeline (19).

4. The continuous high-strength gypsum slurry separation and drying system according to claim 2, characterized in that: The continuous high-strength gypsum slurry separation and drying system further comprises a radar level meter module (6), wherein the radar level meter module (6) is arranged at the upper end of the solid-liquid separation unit (9), and the radar level meter module (6) is interlocked with the drive motor (3).

5. The continuous high-strength gypsum slurry separation and drying system according to claim 1, characterized in that: A slurry pump (17) is provided between the feed end of the hydrothermal reaction unit (16) and the discharge end of the material preparation unit (18), and the slurry pump (17) is used to pump the homogeneous reaction slurry in the material preparation unit (18) into the hydrothermal reaction unit (16).

6. The continuous high-strength gypsum slurry separation and drying system according to claim 1, characterized in that: The discharge end of the hydrothermal reaction unit (16) is connected to the feed end of the solid-liquid separation unit (9), and the high-pressure slurry after the reaction enters the solid-liquid separation unit (9).

7. The continuous high-strength gypsum slurry separation and drying system according to claim 1, characterized in that: The liquid phase discharge end of the solid-liquid separation unit (9) is connected to the liquid phase feed end of the material preparation unit (18) via a liquid phase recovery pipe (11), and a first back pressure valve (5) is provided on the liquid phase recovery pipe (11), and the first back pressure valve (5) is used to control the pressure of the solid-liquid separation unit (9); The liquid phase discharge end of the flash unit (13) is connected to the liquid phase feed end of the material preparation unit (18) via a liquid phase recovery pipe (11), and a second back pressure valve (12) is provided on the liquid phase recovery pipe (11), and the second back pressure valve (12) is used to adjust the pressure of the flash unit (13).

8. The continuous high-strength gypsum slurry separation and drying system according to claim 1, characterized in that: The continuous high-strength gypsum slurry separation and drying system further comprises a post-processing unit (14), and the post-processing unit (14) is connected to the solid phase discharge end of the drying unit (15).

9. The continuous high-strength gypsum slurry separation and drying system according to claim 8, characterized in that: The post-processing unit (14) comprises a ball milling module and a packaging module, etc.

10. The continuous high-strength gypsum slurry separation and drying system according to claim 1, characterized in that: The continuous high-strength gypsum slurry separation and drying system also includes a heating unit (1), wherein a heat output end of the heating unit (1) is respectively connected to a heat input end of the hydrothermal reaction unit (16) and a heat input end of the drying unit (15) through a heat transfer pipeline, so as to provide heat sources for the hydrothermal reaction unit (16) and the drying unit (15), respectively.

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