Anhydrite superfine grinding system

Abstract

The application discloses anhydrite superfine grinding system, including: raw material barrel, for storing and supplying anhydrite raw material;Superfine grinding machine, through the feed screw conveyor is connected to the raw material barrel, the superfine grinding machine is provided with first air inlet and second air inlet, the first air inlet is installed with air dryer, air dryer is used for removing moisture in air;Pulse dust collector, communication in superfine grinding machine, pulse dust collector is used for collecting anhydrite powder from superfine grinding machine;Finished product barrel, for receiving anhydrite powder after filtering through pulse dust collector;Transmission mechanism, set between finished product barrel and pulse dust collector, for conveying anhydrite powder collected through pulse dust collector to finished product barrel. Solve the problem of powder agglomeration and flowability decline often due to moisture in air during anhydrite grinding process, anhydrite may be converted to hemihydrate or dihydrate after absorbing moisture, resulting in performance degradation.

Description

Technical Field

[0001] This application relates to an anhydrous gypsum ultrafine grinding system, belonging to the field of anhydrous gypsum grinding technology. Background Technology

[0002] Anhydrous gypsum contains no water of crystallization, resulting in low energy consumption during grinding. After processing, it can be used as a filler in plastics and rubber. After modification with coupling agents, ultrafine anhydrous gypsum powder can enhance the mechanical strength, heat resistance, and dimensional stability of polymers. Therefore, ultrafine grinding technology for anhydrous gypsum can meet the performance requirements of fillers in polymer materials, promoting the development of related industries.

[0003] However, during the grinding process of anhydrous gypsum, powder agglomeration and decreased flowability often occur due to moisture in the air. Anhydrous gypsum may transform into hemihydrate gypsum after absorbing moisture. or dihydrate gypsum The conversion process leads to performance degradation.

[0004] Therefore, the inventors have proposed an anhydrous gypsum ultrafine grinding system that can effectively solve the above problems. Summary of the Invention

[0005] The purpose of this application is to provide an anhydrous gypsum ultrafine grinding system, which can effectively solve the problems of powder agglomeration and decreased fluidity that often occur during the grinding process of anhydrous gypsum due to moisture in the air, and the potential for anhydrous gypsum to transform into hemihydrate gypsum after absorbing moisture. or dihydrate gypsum The conversion process leads to performance degradation.

[0006] The technical problem to be solved in this application is achieved by the following technical solution: An anhydrous gypsum ultrafine grinding system includes: Raw material drums are used for storing and supplying anhydrous gypsum raw materials; An ultrafine grinding mill is connected to the raw material tank via a feeding screw conveyor. The ultrafine grinding mill is provided with a first air inlet and a second air inlet. An air dryer is installed on the first air inlet. The air dryer is used to remove moisture from the air. A pulse dust collector is connected to the ultrafine grinding mill, and the pulse dust collector is used to collect anhydrous gypsum powder from the ultrafine grinding mill. The finished product bucket is used to receive anhydrous gypsum powder after it has been filtered by the pulse dust collector. A conveying mechanism is disposed between the finished product barrel and the pulse dust collector, and is used to convey the anhydrous gypsum powder collected by the pulse dust collector to the finished product barrel.

[0007] Preferably, the transmission mechanism includes: A dust collector screw conveyor is connected to the pulse dust collector; The elevator is connected to the discharge port of the dust collection screw conveyor via a screw feeder.

[0008] Preferably, a circulation pipe is connected between the second air inlet and the pulse dust collector, and a centrifugal fan is installed on the circulation pipe. The centrifugal fan is used to pump the air in the pulse dust collector into the ultrafine grinding mill for reuse.

[0009] Preferably, an air cooler is also installed on the circulation pipeline, which is used to cool the air flowing through the circulation pipeline.

[0010] Preferably, the circulation pipeline is further provided with an exhaust branch pipe, which is located between the centrifugal fan and the air cooler, and a first electric damper is installed on the exhaust branch pipe.

[0011] Preferably, a second electric damper is installed on the air inlet duct of the air dryer.

[0012] Preferably, a temperature sensor is installed at the outlet of the ultrafine grinding mill, and the temperature sensor is preferably an infrared temperature sensor.

[0013] Preferably, a humidity sensor is installed on the exhaust manifold.

[0014] Preferably, the first electric damper, the second electric damper, the temperature sensor, and the humidity sensor are all electrically connected to the system control unit.

[0015] The beneficial effects of this application are: 1. This application includes a raw material tank for storing and supplying anhydrous gypsum raw materials; an ultrafine grinding mill connected to the raw material tank via a feeding screw conveyor, the ultrafine grinding mill having a first air inlet and a second air inlet, the first air inlet being equipped with an air dryer for removing moisture from the air; a pulse dust collector connected to the ultrafine grinding mill for collecting anhydrous gypsum powder from the ultrafine grinding mill; a finished product tank for receiving the anhydrous gypsum powder filtered by the pulse dust collector; and a conveying mechanism located between the finished product tank and the pulse dust collector for conveying the anhydrous gypsum powder collected by the pulse dust collector to the finished product tank. Except for a small amount of supplemental air, this system operates essentially in a closed loop, effectively preventing the introduction of moisture from the outside. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the principle structure of this application.

[0017] In the diagram: 1. Raw material bucket; 2. Feeding screw conveyor; 3. Ultrafine grinder; 4. Pulse dust collector; 5. Circulation pipeline; 6. Centrifugal fan; 7. Air cooler; 8. First electric damper; 9. Exhaust branch pipe; 10. Air dryer; 11. Second electric damper; 12. Dust collection screw conveyor; 13. Screw feeder; 14. Elevator; 15. Finished product bucket; 16. Finished product screw conveyor; 17. Finished product feeder. Detailed Implementation

[0018] To facilitate a clear understanding of the technical means, creative features, objectives, and effects of this application, the following description, in conjunction with specific illustrations, further elaborates on this application.

[0019] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the equipment or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] The following disclosure provides numerous different embodiments or examples for implementing various structures of the embodiments of this application. To simplify the disclosure of the embodiments of this application, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of this application; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in the embodiments of this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0023] like Figure 1 As shown, an anhydrous gypsum ultrafine grinding system includes: a raw material tank 1, an ultrafine grinder 3, a feeding screw conveyor 2, a pulse dust collector 4, a finished product tank 15, a dust collecting screw conveyor 12, an elevator 14, and a screw feeder 13.

[0024] Specifically, the raw material tank 1 is used to store and supply anhydrous gypsum raw materials to be ground. The anhydrous gypsum raw materials, as specified in the instruction manual, are raw materials that have undergone processing, crushing, and pre-treatment. The ultrafine grinding mill 3 is connected to the raw material tank 1 via a feeding screw conveyor 2. The feeding screw conveyor 2 transports the anhydrous gypsum raw materials to the ultrafine grinding mill 3 for grinding. The ultrafine grinding mill 3 is equipped with a first air inlet and a second air inlet. An air dryer 10 is installed on the first air inlet to remove moisture from the air, ensuring that the air entering the ultrafine grinding mill 3 is dry. This prevents the anhydrous gypsum powder from contacting moisture in the air during grinding, which could lead to powder agglomeration and decreased flowability. Anhydrous gypsum may transform into hemihydrate gypsum after absorbing moisture. or dihydrate gypsum The air dryer 10 is equipped with a second electric damper 11 on its air inlet duct. The pulse dust collector 4 is connected to the outlet of the ultrafine grinder 3 via a pipe. The pulse dust collector 4 is used to collect anhydrous gypsum powder from the ultrafine grinder 3. The pulse dust collector 4 achieves efficient dust removal through two core mechanisms: filtration to separate dust from gas and pulse jet cleaning. This ensures stable system operation, meets environmental protection requirements, and improves product quality. The finished product container 15 is used to receive the anhydrous gypsum powder filtered by the pulse dust collector 4. A transmission mechanism is connected between the finished product container 15 and the pulse dust collector 4. The transmission mechanism is used to transport the anhydrous gypsum powder collected by the pulse dust collector 4 to the finished product container 15. Specifically, the transmission mechanism includes: a dust collection screw conveyor 12 connected to the pulse dust collector 4; and an elevator 14 connected to the outlet of the dust collection screw conveyor 12 via a screw feeder 13. The discharge port of the finished product barrel 15 is connected to a finished product conveyor 16, and a finished product unloading machine 17 is installed at the discharge port of the finished product conveyor 16. The finished products are packaged through the finished product unloading machine 17.

[0025] In a preferred embodiment, a circulation pipe is connected between the second air inlet and the pulse dust collector. A centrifugal fan 6 is installed on the circulation pipe. The centrifugal fan 6 is used to pump the air filtered by the pulse dust collector 4 into the ultrafine grinder 3 for reuse, while also reducing air pollution.

[0026] In a preferred embodiment, an air cooler 7 is also installed on the circulation pipeline 5. The air cooler 7 is used to cool the air flowing through the circulation pipeline 5. After the cold air passes through the ultrafine grinder 3 and the pulse dust collector 4, a large amount of heat is generated due to particle collision, friction and equipment operation, which causes the temperature inside the grinding chamber to rise significantly. The high temperature may cause anhydrous gypsum (Type III) to transform into low-activity anhydrite (Type II), reducing its hydration reaction capacity and affecting the performance of the final product (such as strength and setting time). The high temperature also causes the surface moisture of the gypsum particles to evaporate, increasing their adhesion. They are prone to caking on the inner wall of the ultrafine grinder 3 or on the grinding media, clogging the screen or the discharge port.

[0027] In a preferred embodiment, an exhaust branch pipe 9 is also provided on the circulation pipeline 5. The exhaust branch pipe 9 is located between the centrifugal fan 6 and the air cooler 7, and a first electric damper 8 is installed on the exhaust branch pipe 9.

[0028] In a preferred embodiment, a temperature sensor is installed at the outlet of the ultrafine grinding mill 3, preferably an infrared temperature sensor. A humidity sensor is installed on the exhaust branch pipe 9. The first electric damper 8, the second electric damper 11, the temperature sensor, and the humidity sensor are all electrically connected to the system control unit. When the temperature sensor installed at the outlet of the ultrafine grinding mill 3 detects that the temperature has reached the preset temperature, it transmits the temperature signal to the system control unit. Upon receiving the signal, the system control unit sends an opening command to the first electric damper 8 and the second electric damper 11 to perform a heat exchange process on the entire system. When the humidity sensor installed on the exhaust branch pipe 9 detects that the humidity of the air coming out of the exhaust branch pipe 9 has reached the preset value, the system control unit, upon receiving the electrical signal from the humidity sensor, sends a command to the first electric damper 8 and the second electric damper 11 to control the opening degree of the first electric damper 8 and the second electric damper 11 to control the exhaust volume and the intake volume. All of the above-mentioned equipment in this application are existing technologies. For example, the ultrafine grinding mill 3 is manufactured by our company and its patent publication number is CN203565179U. The system electrical control unit, pulse dust collector 4, etc. are all common equipment on the market. Their structures and principles will not be described in detail.

[0029] Principle: The anhydrous gypsum raw material to be processed is conveyed to the ultrafine grinder 3 by the feeding screw conveyor 2 and then enters the pulse dust collector 4 after grinding. The air filtered by the pulse dust collector 4 is returned to the ultrafine grinder 3 through the circulation pipeline 5 for reuse. The anhydrous gypsum powder is conveyed to the finished product barrel 15 by the dust collection screw conveyor 12, the screw feeder 13, and the elevator 14. The finished product in the finished product barrel 15 is then packaged by the finished product screw conveyor 16 and the finished product feeder 17. Throughout the grinding process, the system is sealed to prevent the anhydrous gypsum from contacting the air.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of this application; all such changes and modifications fall within the scope of the claims. The scope of protection of this application is defined by the appended claims and their equivalents.

Claims

1. A waterless gypsum ultrafine grinding system, characterized in that, include: Raw material drums are used for storing and supplying anhydrous gypsum raw materials; An ultrafine grinding mill is connected to the raw material tank via a feeding screw conveyor. The ultrafine grinding mill is provided with a first air inlet and a second air inlet. An air dryer is installed on the first air inlet. The air dryer is used to remove moisture from the air. A pulse dust collector is connected to the ultrafine grinding mill, and the pulse dust collector is used to collect anhydrous gypsum powder from the ultrafine grinding mill. The finished product bucket is used to receive anhydrous gypsum powder after it has been filtered by the pulse dust collector. A conveying mechanism is disposed between the finished product barrel and the pulse dust collector, and is used to convey the anhydrous gypsum powder collected by the pulse dust collector to the finished product barrel.

2. The anhydrous gypsum ultrafine grinding system according to claim 1, characterized in that, The transmission mechanism includes: A dust collector screw conveyor is connected to the pulse dust collector; The elevator is connected to the discharge port of the dust collection screw conveyor via a screw feeder.

3. The anhydrous gypsum ultrafine grinding system according to claim 2, characterized in that: A circulation pipe is connected between the second air inlet and the pulse dust collector. A centrifugal fan is installed on the circulation pipe. The centrifugal fan is used to pump the air in the pulse dust collector into the ultrafine grinding mill for reuse.

4. The anhydrous gypsum ultrafine grinding system according to claim 3, characterized in that: An air cooler is also installed on the circulation pipeline, which is used to cool the air flowing through the circulation pipeline.

5. The anhydrous gypsum ultrafine grinding system according to claim 4, characterized in that: An exhaust branch pipe is also provided on the circulation pipeline. The exhaust branch pipe is located between the centrifugal fan and the air cooler, and a first electric damper is installed on the exhaust branch pipe.

6. The anhydrous gypsum ultrafine grinding system according to claim 5, characterized in that: A second electric damper is installed on the air inlet duct of the air dryer.

7. The anhydrous gypsum ultrafine grinding system according to claim 6, characterized in that: A temperature sensor is installed at the outlet of the ultrafine grinding mill.

8. The anhydrous gypsum ultrafine grinding system according to claim 7, characterized in that: A humidity sensor is installed on the exhaust manifold.

9. The anhydrous gypsum ultrafine grinding system according to claim 8, characterized in that: The first electric damper, the second electric damper, the temperature sensor, and the humidity sensor are all electrically connected to the system control unit.

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