A continuous high-strength gypsum slurry separation and drying system

Abstract

This invention belongs to the field of high-pressure slurry solid-liquid separation technology and discloses a continuous high-strength gypsum slurry separation and drying system. The continuous high-strength gypsum slurry separation and drying system includes a material preparation unit, a hydrothermal reaction unit, a solid-liquid separation unit, a pressure-reducing conveying unit, a flash evaporation unit, and a drying unit connected in series. The homogeneous reaction raw materials prepared in the material preparation unit undergo a hydrothermal reaction in the hydrothermal reaction unit to produce a high-pressure slurry. The high-pressure slurry sequentially enters the solid-liquid separation unit, the pressure-reducing conveying unit, and the flash evaporation unit for step-by-step solid-liquid separation, and is then dried in the drying unit to obtain α-type hemihydrate calcium sulfate. The liquid phase outlets of the solid-liquid separation unit, the flash evaporation unit, and the drying unit are all connected to the material preparation unit to achieve liquid phase recycling. This continuous high-strength gypsum slurry separation and drying system can effectively improve the quality of α-type hemihydrate calcium sulfate, and is simple to operate, has low energy consumption, and can effectively promote the resource utilization of industrial solid waste.

Description

Technical Field

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

[0002] Desulfurized gypsum is a byproduct of flue gas desulfurization processes in power plants, and it has wide applications in mud products, fertilizers, ceramics and glass products, construction, and soil improvement.

[0003] Currently, the main approach to the resource utilization of desulfurized gypsum is the preparation of calcium sulfate hemihydrate. Calcium sulfate hemihydrate mainly includes α-type calcium sulfate hemihydrate and β-type calcium sulfate hemihydrate. Because β-type calcium sulfate hemihydrate has higher porosity but lower strength, resulting in poorer economic benefits, the current resource utilization of desulfurized gypsum in this field mainly focuses on converting it into α-type calcium sulfate hemihydrate.

[0004] Existing technologies primarily employ subcritical hydrothermal methods to upgrade 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, solid-liquid separation is required to obtain high-value α-type hemihydrate calcium sulfate. This necessitates separate hydrothermal equipment and separation devices for hydrothermal treatment and solid-liquid separation, leading to operational inconvenience. Furthermore, existing technologies utilize centrifugal separation devices such as settling tanks and centrifuges for solid-liquid separation. However, α-type hemihydrate gypsum requires high-temperature operation during separation to prevent vaporization, necessitating high-pressure operation. Some existing separation devices cannot maintain this high-temperature, high-pressure operation, and α-type hemihydrate gypsum is prone to sedimentation and caking. Settling separation devices are also unsuitable for separating α-type hemihydrate gypsum and cannot operate continuously. The main separation technologies include sedimentation, filtration, and ion exchange. During the drying process, a temperature of 60℃ to 90℃ must be maintained to prevent product deterioration. However, existing equipment and methods cannot effectively solve problems such as deposition, caking, and deterioration of α-type hemihydrate gypsum, and cannot continuously achieve high-pressure, high-temperature separation of high-pressure slurry. Summary of the Invention

[0005] To address the aforementioned technical problems and enable the continuous separation of α-type hemihydrate gypsum slurry under high temperature and high pressure conditions, this invention provides a continuous high-strength gypsum slurry separation and drying system. The continuous high-strength gypsum slurry separation and drying system of this invention includes a material preparation unit, a hydrothermal reaction unit, a solid-liquid separation unit, a pressure-reducing conveying unit, a flash evaporation unit, and a drying unit connected in series. The homogeneous reaction raw materials prepared in 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 conveying unit, and the flash evaporation unit for staged solid-liquid separation, and is then dried in the drying unit to obtain α-type hemihydrate calcium sulfate. The liquid phase outlets of the solid-liquid separation unit, the flash evaporation unit, and the drying unit are all connected to the material preparation unit, thereby preventing phase transformation of the α-type hemihydrate calcium sulfate in the high-pressure slurry during the separation process. This improves the quality of the α-type hemihydrate calcium sulfate while also achieving the recycling of the liquid phase components and reducing energy consumption.

[0006] The continuous high-strength gypsum slurry separation and drying system of the present invention is achieved through the following technical solution:

[0007] This invention provides a continuous high-strength gypsum slurry separation and drying system, including a material preparation unit, a hydrothermal reaction unit, a solid-liquid separation unit, a pressure-reducing conveying unit, a flash evaporation unit, a drying unit, and a power unit.

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

[0009] In this 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 material output from the material preparation unit, and to make the homogeneous reaction raw material undergo a hydrothermal reaction in the hydrothermal reaction unit to realize the hydrothermal dechlorination and upgrading of desulfurized gypsum to form α-type hemihydrate gypsum.

[0010] In this 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 performs preliminary separation of the high-pressure slurry through the solid-liquid separation unit to obtain a preliminarily separated viscous phase slurry and liquid phase component. Furthermore, the solid-liquid separation unit is equipped with a pressure detection unit to monitor the pressure changes within the solid-liquid separation unit in real time.

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

[0012] In this invention, the feed end of the depressurization conveying unit is connected to the viscous slurry discharge end of the solid-liquid separation unit, and the depressurization conveying unit is driven by the power unit, so that the depressurization conveying unit receives the viscous slurry after solid-liquid separation by the solid-liquid separation unit, and under the drive of the power unit, it conveys and depressurizes the viscous slurry, while maintaining the pressure inside the solid-liquid separation unit.

[0013] In this invention, by connecting the feed end of the flash evaporation unit to the discharge end of the depressurization conveying unit to receive the viscous slurry output by the depressurization conveying unit, the viscous slurry is further flash-separated by the flash evaporation unit on the basis of solid-liquid separation, so as to further separate the liquid phase and solid phase in the viscous slurry, thereby improving the solid-liquid separation effect.

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

[0015] In this invention, the liquid phase discharge end of the solid-liquid separation unit, the liquid phase discharge end of the flash evaporation 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 liquid phase conveying pipelines to realize the recycling of the liquid phase, thereby reducing energy and quality loss during operation.

[0016] In some preferred embodiments of the present invention, the power unit includes a rotating shaft, a drive motor, and a telescopic module. The rotating shaft is vertically disposed within the solid-liquid separation unit, with its upper end connected to the output end of the drive motor and its lower end drivenly connected to the upper end of the conveying paddle. The telescopic module is capable of extending and retracting along the axial direction of the rotating shaft, with its upper end connected to the output end of the drive motor. The telescopic module is interlocked with the pressure detection unit, enabling the drive motor to drive the rotating shaft to rotate. The rotational force generated by the rotating shaft prevents clogging caused by the hydration and agglomeration of the high-pressure slurry within the solid-liquid separation unit. Simultaneously, the rotating shaft also drives the depressurization conveying unit to perform conveying, stirring, and depressurization processing. Furthermore, the pressure detection unit and the telescopic module are interlocked to control the pressure in the solid-liquid separation unit. When the pressure detection unit detects that the pressure in the solid-liquid separation unit is too high, the telescopic module is controlled to contract by the drive motor to reduce the length of the pressure-reducing conveying unit used for pressure reduction, thereby mitigating the pressure reduction effect. When the pressure detection unit detects that the pressure in the solid-liquid separation unit is too low, the telescopic module is controlled to extend by the drive motor to increase the length of the pressure-reducing conveying unit and enhance the seal.

[0017] In some preferred embodiments of the present invention, the depressurization conveying unit includes a depressurization conveying pipe, a conveying paddle, and a depressurization paddle. The two ends of the depressurization conveying pipe are respectively connected to the discharge end of the solid-liquid separation unit and the feed end of the flash evaporation unit, so that the viscous slurry can be depressurized and then conveyed to the flash evaporation unit. Furthermore, the conveying paddle of the present invention is disposed inside the solid-liquid separation unit to prevent material from depositing and caking within the tank, causing blockage. Additionally, the upper end of the conveying paddle is drivenly connected to the rotating shaft, and the depressurization paddle is coaxially disposed at the lower end of the conveying paddle and located within the depressurization conveying pipe, allowing the conveying paddle and the depressurization paddle to rotate with the rotating shaft. This enables the conveying paddle to continuously discharge material, while the depressurization paddle controls the material output rate and provides a certain degree of sealing. Thus, depressurization can be achieved by controlling the discharge speed, 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 gauge module. The radar level gauge module is disposed at the upper end of the solid-liquid separation unit and is used to detect the height of the viscous slurry within the solid-liquid separation unit. The radar level gauge module is interlocked with the drive motor. When the radar level gauge module detects that the height of the viscous slurry within the solid-liquid separation unit is too high, it increases the speed of the drive motor to control the discharge rate; when the radar level gauge module detects that the height of the viscous slurry within the solid-liquid separation unit is too low, it decreases the speed of the drive motor.

[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. 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 preferred embodiments of the present invention, the slurry pump includes, but is not limited to, screw pumps and centrifugal pumps.

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

[0022] In some preferred embodiments of the present invention, the reaction conditions set for 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 preferred embodiments of the present invention, the liquid phase discharge end of the solid-liquid separation unit and the liquid phase feed end of the material preparation unit are connected by a first liquid phase recovery pipe. The liquid phase recovery pipe is provided with a first back pressure valve, which is used to maintain the separation pressure of the solid-liquid separation unit. 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 preferred embodiments of the present invention, the liquid phase discharge end of the flash evaporation unit and the liquid phase feed end of the material preparation unit are connected by a liquid phase recovery pipe. A second back pressure valve is provided on the liquid phase recovery pipe. The second back pressure valve is used to adjust the pressure of the flash evaporation unit separation. The separated liquid flows back 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 further includes a post-processing unit, which is connected to the solid discharge end of the drying unit, so as to further process the dried product into α-type hemihydrate calcium sulfate product through the post-processing unit.

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

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

[0028] In some 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 further includes a heating unit, wherein the heat output end of the heating unit is connected to the heat input end of the hydrothermal reaction unit and the heat input end of the drying unit through heat transmission pipes, so as to provide heat sources for the hydrothermal reaction unit and the drying unit respectively.

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

[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 includes a material preparation unit, a hydrothermal reaction unit, a solid-liquid separation unit, a pressure-reducing conveying unit, a flash evaporation unit, and a drying unit connected in series. The homogeneous reaction raw materials prepared in the material preparation unit undergo a hydrothermal reaction in the hydrothermal reaction unit to produce a high-pressure slurry. The high-pressure slurry enters the solid-liquid separation unit, the pressure-reducing conveying unit, and the flash evaporation unit in sequence for stepwise solid-liquid separation, and is then dried in the drying unit to obtain α-type hemihydrate calcium sulfate. The liquid phase outlets of the solid-liquid separation unit, the flash evaporation unit, and the drying unit are all connected to the material preparation unit, thereby avoiding the phase transformation of α-type hemihydrate calcium sulfate in the high-pressure slurry during the separation process. While improving the quality of α-type hemihydrate calcium sulfate, it also realizes the recycling of liquid phase components and reduces energy consumption.

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

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

[0035] This invention uses water as the main solution, without any other additional additives or secondary pollutants, thus avoiding secondary pollution and improving environmental benefits.

[0036] This invention utilizes industrial waste gypsum, realizing the resource utilization of industrial solid waste. Attached Figure Description

[0037] Figure 1 This is a 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 transport, and the black arrow indicates the direction of solid phase transport.

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

[0039] Figure 3 This is a schematic diagram of the pressure-reducing material conveying unit of the present invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Heating unit; 2. Pressure monitoring unit; 3. Drive motor; 4. Telescopic unit; 5. First back pressure valve; 6. Radar level gauge; 7. Rotating shaft; 8. Conveying paddle; 9. Solid-liquid separation unit; 10. Pressure-reducing conveying unit; 11. Liquid phase recovery pipe; 12. Second back pressure valve; 13. Flash evaporation unit; 14. Post-treatment unit; 15. Drying unit; 16. Hydrothermal reaction unit; 17. Slurry pump; 18. Material preparation unit; 19. Pressure-reducing conveying pipe; 20. Pressure-reducing conveying paddle. Detailed Implementation

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

[0043] Example 1

[0044] Please see Figure 1 This 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-reducing conveying unit 10, a flash evaporation 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 material of desulfurized gypsum in hydrothermal dechlorination and upgrading, and to prepare the reaction material of desulfurized gypsum in hydrothermal dechlorination and upgrading into homogeneous reaction raw materials to improve its hydrothermal dechlorination and upgrading effect.

[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. This allows the homogeneous reaction raw materials output from the material preparation unit 18 to undergo a hydrothermal reaction under the high temperature and high pressure conditions of the hydrothermal reaction unit 16, thereby achieving hydrothermal dechlorination and upgrading of desulfurized gypsum and forming a high-pressure slurry. The formed high-pressure slurry and the residual pressure after the hydrothermal reaction unit 16 enter the solid-liquid separation unit 9 together, allowing the high-pressure slurry to achieve preliminary solid-liquid separation under the synergistic effect of the residual pressure and the power provided by the power unit, resulting in a preliminarily separated viscous slurry and liquid phase components.

[0047] Please see Figure 1 and Figure 2In this embodiment, the power unit includes a rotating shaft 7, a drive motor 3, and a telescopic module 4. The rotating shaft 7 is vertically disposed within the solid-liquid separation unit 9, with its upper end connected to the telescopic module 4 and its lower end drivenly connected to the upper end of the pressure-reducing conveying unit 10. The telescopic module 4 can extend and retract along the axial direction of the rotating shaft 7, and its upper end is connected to the output end of the drive motor 3. The telescopic module 4 is interlocked with the pressure detection unit 2, allowing the drive motor 3 to drive the rotating shaft 7 to rotate. The rotational force generated by the rotating shaft 7 promotes solid-liquid separation of the high-pressure slurry within the solid-liquid separation unit 9. Simultaneously, the rotation of the rotating shaft 7 also drives the pressure-reducing conveying unit 10 to perform pressure reduction. 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. 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 detection unit 2 detects that the pressure in the solid-liquid separation unit 9 is too high, the telescopic module 4 is controlled to contract by the drive motor 3 to reduce the length of the pressure-reducing conveying unit 10 used for pressure reduction, thereby mitigating the pressure reduction effect. When the pressure detection unit 4 detects that the pressure in the solid-liquid separation unit 9 is too low, the telescopic module 4 is controlled to extend by the drive motor 3 to increase the length of the pressure-reducing conveying unit 10 and enhance the seal.

[0048] Please see Figure 1 and Figure 3 The depressurization conveying unit 4 in this embodiment includes a depressurization conveying pipe 19, a conveying impeller 8, and a depressurization conveying impeller 20. The two ends of the depressurization conveying pipe 19 are respectively connected to the outlet end of the solid-liquid separation unit 9 and the inlet end of the flash evaporation unit 13, so that the viscous slurry can be depressurized and conveyed to the flash evaporation unit 13. Furthermore, the conveying impeller 8 is disposed inside the solid-liquid separation unit 9 to prevent material from depositing and caking within the tank, causing blockages. Furthermore, the upper end of the conveying blade 8 is drivenly connected to the rotating shaft 7, and the pressure-reducing conveying blade 20 is coaxially arranged at the lower end of the conveying blade 8 and located inside the pressure-reducing conveying pipe 19, so that the conveying blade 8 and the pressure-reducing conveying blade 20 can rotate with the rotation of the rotating shaft 7, thereby allowing the conveying blade 8 to continuously discharge materials. The pressure-reducing conveying blade 20 can control the output rate of materials and can also play a certain sealing role. Thus, by controlling the discharge speed, high-pressure separation of viscous slurry can be achieved to form pressure-reducing slurry, improving the safety and reliability of system operation.

[0049] In this embodiment, the feed end of the flash evaporation unit 13 is connected to the discharge end of the depressurization conveying unit 10 to receive the depressurized slurry output by the depressurization conveying unit 10. Based on the depressurization treatment, the depressurized slurry is further subjected to flash evaporation separation treatment by the flash evaporation unit 13 to further separate the liquid phase and 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 evaporation unit 13 to receive and dry the solid components output by the flash evaporation unit 13. The obtained solid components are α-type calcium sulfate hemihydrate after dechlorination and upgrading of desulfurized gypsum by 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 evaporation 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, so as to realize the recycling of the liquid phase and reduce the energy and quality loss during operation.

[0052] Please see Figure 1 In a preferred embodiment of the present invention, the continuous high-strength gypsum slurry separation and drying system further includes a radar level gauge module 6, which is disposed at the upper end of the solid-liquid separation unit 9 and is used to detect the height of the viscous slurry in the solid-liquid separation unit 9.

[0053] Please see 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, screw pumps and centrifugal pumps.

[0054] In a more preferred embodiment of the present invention, the liquid phase outlet of the solid-liquid separation unit 9 and the liquid phase inlet of the material preparation unit 18 are connected by 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 outlet of the flash evaporation unit 13 and the liquid phase inlet of the material preparation unit 18 are connected by a liquid phase recovery pipe 11, and a second back pressure valve 12 is provided on the liquid phase recovery pipe 11. 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 flash evaporation unit 13, so that the liquid phase components separated by the solid-liquid separation unit 9 and the flash evaporation unit 13 can be recycled 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 further includes a post-processing unit 14, which is connected to the solid discharge end of the drying unit 15, so as to further process the dried product into α-type hemihydrate calcium sulfate 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 evaporation unit 13 is a flash evaporation 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 further includes a heating unit 1, the heat output end of the heating unit 1 being connected to the heat input end of the hydrothermal reaction unit 16 and the heat input end of the drying unit 15 respectively through heat transmission pipes, so as 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 for 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, 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.

Claims

1. A continuous high-strength gypsum slurry separation and drying system, characterized in that, It includes a material preparation unit (18), a hydrothermal reaction unit (16), a solid-liquid separation unit (9), a pressure-reducing conveying 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 caking and blockage, and at the same time provide power for the discharge of the viscous slurry. The feed end of the depressurization conveying unit (10) is connected to the viscous slurry discharge end of the solid-liquid separation unit (9), and the depressurization conveying unit (10) is driven by the power unit to depressurize and convey the viscous 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 depressurization conveying unit (10) to perform flash separation treatment on the viscous slurry output from the depressurization conveying unit (10); The feed end of the drying unit (15) is connected to the solid material discharge end of the flash evaporation unit (13) to receive and dry the solid 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 evaporation 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 realize the recycling of the liquid phase.

2. The continuous high-strength gypsum slurry separation and drying system as described in claim 1, characterized in that, The power unit includes a rotating shaft (7), a drive motor (3), and a telescopic module (4); The rotating shaft (7) is vertically arranged inside 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 driven to the upper end of the pressure reducing and conveying 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 as described in claim 2, characterized in that, The pressure-reducing conveying unit (10) includes a pressure-reducing conveying pipe (19), a conveying blade (8), and a pressure-reducing conveying blade (20). The two ends of the pressure-reducing conveying pipeline (19) are respectively connected to the discharge end of the solid-liquid separation unit (9) and the feed end of the flash evaporation unit (13); The conveying blade (8) is disposed inside the solid-liquid separation unit (9), and the upper end of the conveying blade (8) is driven to be connected to the rotating shaft (7). The pressure-reducing conveying blade (20) is coaxially disposed at the lower end of the conveying blade (8) and located inside the pressure-reducing conveying pipe (19).

4. The continuous high-strength gypsum slurry separation and drying system as described in claim 2, characterized in that, The continuous high-strength gypsum slurry separation and drying system also includes a radar level gauge module (6), which is located at the upper end of the solid-liquid separation unit (9) and is interlocked with the drive motor (3).

5. The continuous high-strength gypsum slurry separation and drying system as described in 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). 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 as described in 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 as described in claim 1, characterized in that, The liquid phase discharge end of the solid-liquid separation unit (9) and the liquid phase feed end of the material preparation unit (18) are connected through a liquid phase recovery pipe (11). 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 evaporation unit (13) and the liquid phase feed end of the material preparation unit (18) are connected through a liquid phase recovery pipe (11). 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 evaporation unit (13).

8. The continuous high-strength gypsum slurry separation and drying system as described in claim 1, characterized in that, 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).

9. The continuous high-strength gypsum slurry separation and drying system as described in claim 8, characterized in that, The post-processing unit (14) includes a ball milling module and a packaging module.

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

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