Production system for producing cement retarder from solid waste residue phosphogypsum

Abstract

The utility model discloses a production system for producing a cement retarder from solid waste residue ardealite, and relates to the technical field of ardealite recycling. The production line comprises batching equipment, granulation equipment, steam curing equipment and a storage bin, the batching equipment is used for preparing raw materials in proportion, the granulation equipment is used for granulating and forming the raw materials to form intermediate products, the steam curing equipment is used for performing steam curing treatment on the intermediate products to form semi-finished products, and the storage bin is used for storing the semi-finished products. The storage bin is used for storing and cooling finished products; the steam curing equipment comprises a steam curing kettle and a trolley, the trolley is used for transporting ardealite into the steam curing kettle, the trolley is provided with a vent hole, and steam passes through the vent hole. According to the ardealite steam curing device, the vent holes are formed in the hopper car for conveying ardealite, after steam enters from the vent holes, the distance between the steam and the ardealite at the bottom is smaller, the time needed by contact between the steam and the ardealite at the bottom is shortened, and the ardealite steam curing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of phosphogypsum recycling and utilization, and particularly provides a production system for producing a cement retarder from solid waste phosphogypsum. Background Art

[0002] Phosphogypsum is a powdery solid industrial waste discharged in large quantities during the production of phosphoric acid for phosphate fertilizer in the phosphochemical industry. Using phosphogypsum to make a cement retarder is a technical means for recycling phosphogypsum. For example, the invention patent with the publication number CN110395929A discloses a cement retarder, and this patent discloses a technical scheme for preparing a cement retarder with phosphogypsum as the raw material.

[0003] In the process of preparing a cement retarder from phosphogypsum, it usually includes a batching process, a granulation process and a steam curing process. Batching refers to configuring raw materials in proportion, for example, mixing phosphogypsum waste residue with other materials in proportion; granulation refers to making the configured raw materials into granular phosphogypsum with uniform size; and the steam curing process is to steam-treat the granular phosphogypsum after granulation. The steam curing process will steam-treat the granular phosphogypsum through steam. The steam curing treatment converts phosphogypsum into hemihydrate gypsum. During the steam curing process, for phosphogypsum to be converted into hemihydrate gypsum, phosphogypsum needs to be in full contact with steam. Usually, phosphogypsum is transported into a steam curing kettle by a vehicle for steam curing. In the steam curing process, it is necessary to wait until the steam passes through the phosphogypsum on the surface layer and contacts the phosphogypsum at the bottom before all the phosphogypsum can be completely converted. Since the steam is blocked by the phosphogypsum on the surface layer, it is necessary for the phosphogypsum to be in the steam curing environment for a long time to enable the steam to pass through the surface layer of phosphogypsum and contact the phosphogypsum at the bottom, resulting in a long steam curing time of phosphogypsum and the problem of low steam curing efficiency. Summary of the Utility Model

[0004] The utility model provides a production system for producing a cement retarder from solid waste phosphogypsum, which is used to solve the problem of long steam curing time of phosphogypsum caused by the blockage of steam by the phosphogypsum on the surface layer and the problem of low steam curing efficiency.

[0005] The technical scheme of the utility model is as follows:

[0006] A production system for producing a cement retarder from solid waste phosphogypsum, including batching equipment, granulating equipment, steam curing equipment, and a storage bin. The batching equipment is used to proportion raw materials, the granulating equipment is used to granulate the raw materials into intermediate products, the steam curing equipment is used to steam cure the intermediate products to form semi-finished products, and the storage bin is used to store and cool the finished products; the steam curing equipment includes a steam curing kettle and a trolley. The trolley is provided with a cavity for containing phosphogypsum, and an opening is provided at the top of the trolley. Phosphogypsum enters the cavity through the opening. The trolley is used to transport the phosphogypsum into the steam curing kettle. The trolley is provided with ventilation holes for passing steam.

[0007] In this solution, the steam curing equipment is improved. Ventilation holes are provided in the trolley used to transport the intermediate products, and the steam in the steam curing kettle can enter the trolley through the steam holes. Therefore, the distance between the entry position of the steam and the phosphogypsum at the bottom of the trolley is reduced, and the time required for the steam to come into full contact with the phosphogypsum at the bottom of the trolley is shortened, which can improve the steam curing efficiency of the phosphogypsum.

[0008] Preferably, the ventilation holes are provided on the bottom surface and / or side surface of the trolley.

[0009] In this solution, ventilation holes can be provided on the bottom surface or the side surface of the trolley, or ventilation holes can be provided on both the bottom surface and the side surface of the trolley at the same time, so that steam can enter the trolley from all directions, further improving the contact efficiency between the steam and the phosphogypsum and enhancing the steam curing efficiency of the phosphogypsum.

[0010] Preferably, the diameter of the ventilation holes is less than 10 mm.

[0011] In this solution, the steam curing process of phosphogypsum usually occurs after granulation. Granulation refers to making phosphogypsum into particles of uniform size. Constraining the diameter of the ventilation holes to less than 10 mm, which is smaller than the size of the phosphogypsum after being processed by a common granulator, makes the diameter of the ventilation holes smaller than the size of the phosphogypsum, preventing the phosphogypsum from falling through the ventilation holes.

[0012] Preferably, the trolley is provided with a plurality of ventilation holes.

[0013] In this solution, setting a plurality of ventilation holes can increase the steam inlets, thereby improving the steam curing efficiency.

[0014] Preferably, connection parts are respectively provided at the front and rear ends of the trolley, and each trolley is connected through the connection parts.

[0015] In this solution, multiple trolleys can be connected end to end through the connection parts. When multiple trolleys are in a connected state, multiple trolleys can be sent into the steam curing kettle at one time to start the operation of the steam curing kettle, improving the conveying efficiency of the phosphogypsum.

[0016] Preferably, the production system further includes a tractor, which is connected to the connecting part of the trolley, and the tractor is used to tow the trolley into the autoclave.

[0017] In this solution, the tractor can be connected to the connecting part, and by towing the trolley with the tractor, the moving efficiency of the trolley can be improved.

[0018] To solve the problem of the trolley being damaged by collision with other equipment, therefore, the trolley is provided with a buffer part, and the buffer part is used to prevent the trolley from having a rigid collision with the autoclave.

[0019] In this solution, the trolley contacts other equipment through the buffer part, and the buffer part can prevent the trolley from having a rigid collision with other equipment, thereby preventing the trolley or other equipment from being damaged due to collision. For example, preventing the trolley from being damaged by collision with the autoclave.

[0020] Preferably, the side and bottom of the trolley are made of steel plates respectively, and the ventilation holes are opened in the steel plates.

[0021] In this solution, using steel plates to form the side and bottom of the trolley and opening the ventilation holes in the steel plates can ensure the strength of the trolley.

[0022] Advantages of the present utility model:

[0023] The present utility model has ventilation holes opened on the trolley for transporting phosphogypsum, so that steam can enter from the top opening of the trolley and the ventilation holes, increasing the steam entry positions. And the ventilation holes are located on the trolley. After the steam enters from the ventilation holes, the distance from the bottom phosphogypsum is smaller, and it can contact the phosphogypsum at the bottom layer more quickly, shortening the time required for the steam to contact the bottom layer phosphogypsum and improving the steam curing efficiency of the phosphogypsum. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions of the present utility model, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is the system structure diagram of the present utility model;

[0026] Figure 2 It is the structural schematic diagram of the batching equipment;

[0027] Figure 3 It is the structural schematic diagram of the granulating equipment;

[0028] Figure 4 It is the structural schematic diagram of the steam curing equipment;

[0029] Figure 5 is the system flow chart of the present utility model;

[0030] Figure 6 is the front view of the skip car;

[0031] Figure 7 is the top view of the skip car after being provided with a buffer part;

[0032] Figure 8 is the front view of the connected state of two skip cars;

[0033] Figure 9 is the cross-sectional view of the connection part of two skip cars.

[0034] In the above-mentioned drawings, the corresponding reference numerals are shown as follows:

[0035] 1, skip car; 2, ventilation hole; 3, rubber block; 4, connection part; 5, wheel; 6, hinge hole; 7, hinge shaft; 8, autoclave; 100, batching equipment; 101, storage bin; 102, weighing scale; 103, mixer; 200, granulation equipment; 201, granulator; 202, screening machine; 300, steam curing equipment; 400, storage silo. Specific embodiments

[0036] Combined with the drawings, through the specific embodiments of the present utility model, the technical solutions of the present utility model are clearly and completely described.

[0037] Embodiment 1:

[0038] As shown in Figure 1 and Figure 5 , Embodiment 1 of the present invention provides a production system for producing a cement retarder from solid waste phosphogypsum, including batching equipment 100, granulation equipment 200 and steam curing equipment 300. Among them, the batching equipment 100 is used to configure raw materials, and the raw materials include phosphogypsum, and also include lime, carbide slag, etc. The batching system mixes various raw materials in proportion. After the batching equipment 100 finishes mixing, it is transported to the granulation equipment 200, and the granulation equipment 200 is used to form the mixed raw materials into a molded intermediate product. The steam curing equipment 300 is used to perform steam curing treatment on the intermediate product. After the steam curing treatment is completed, a semi-finished product can be obtained. The semi-finished product is stored and cooled, and the semi-finished product will combine with water during the cooling process to form dihydrate gypsum, realizing the transformation between gypsum crystal forms, so that the product performance is more stable and can reach the standard of the cement retarder made of natural gypsum.

[0039] Specifically, as shown in Figure 2As shown, the batching equipment 100 is a complete set of comprehensive equipment for material mixing, including several warehouses 101. A belt conveyor and a weighing scale 102 are arranged at the bottom of each warehouse 101. The weighing scale 102 is set at the end of the belt conveyor, and a disintegrator is arranged at the end of the weighing scale 102. A mixer 103 is arranged downstream of the disintegrator.

[0040] Multiple different warehouses 101 are set up. Each warehouse 101 is used to store different types of raw materials. A belt conveyor is arranged at the bottom of each warehouse 101. Through the belt conveyor, various raw materials are conveyed to the weighing scale 102. The function of the weighing scale 102 is to control the proportion of each raw material so that various raw materials are configured according to precise proportions. Each belt conveyor and the weighing scale 102 are controlled by a control system. The control system will control the conveying speed of the belt conveyor according to the raw material proportion, and the weighing scale 102 is used to detect whether the weight of the conveyed raw material is accurate. The control system fine-tunes the conveying speed of the belt conveyor according to the signal of the weighing scale 102. For example, when the weight on the weighing scale 102 is less than the set weight, the control system increases the conveying speed of the belt conveyor. On the contrary, when the weight on the weighing scale 102 is greater than the set weight, the control system decreases the conveying speed of the belt conveyor.

[0041] The control system can be a DCS distributed control system.

[0042] The output end of the weighing scale 102 can directly convey the raw materials to the disintegrator, or a belt conveyor can also be arranged between the weighing scale 102 and the disintegrator to convey the raw materials to the disintegrator through the belt conveyor. The disintegrator is used to disintegrate and preliminarily mix various raw materials. A mixer 103 is arranged downstream of the disintegrator. The mixer 103 is used to further mix the raw materials to make various raw materials evenly mixed. The disintegrator is set to improve the efficiency of raw material mixing and also solve the problem that the raw materials agglomerate and cannot be dispersed and mixed. Therefore, if the raw materials are loose, the disintegrator can also be cancelled and directly conveyed to the mixer 103 for mixing. A belt conveyor can be arranged between the disintegrator and the mixer 103 to convey the raw materials output by the disintegrator to the mixer 103 through the belt conveyor.

[0043] A belt conveyor is arranged at the output end of the mixer 103 to convey the mixed raw materials to the granulating equipment 200 through the belt conveyor.

[0044] Such as Figure 3As shown in the figure, the granulation equipment 200 includes a granulator 201 and a screening machine 202. The raw materials output by the mixing machine 103 are transported to the granulator 201 through a belt conveyor. The granulator 201 manufactures the raw materials into spherical particles, which are intermediate products for manufacturing cement retarders. The intermediate products produced by the granulator 201 are transported to the screening machine 202. Through the screening of the screening machine 202, the intermediate products with qualified sizes are transported to the steam curing equipment 300, and the intermediate products with unqualified sizes are transported to the feeding end of the granulator 201. The output end of the granulator 201 can be transported to the screening machine 202 through structures or equipment such as pipelines and belt conveyors. The screening machine 202 is provided with different output ends. One output end is used to output the intermediate products with qualified sizes, while the other output end is used to output the intermediate products with unqualified sizes. Belt conveyors are provided at both output ends. The intermediate products with qualified sizes are transported to the steam curing equipment 300, while the intermediate products with unqualified sizes are transported to the feeding end of the granulator 201.

[0045] As Figure 4 and Figure 6 shown in the figure, the present application mainly improves the steam curing equipment 300 for phosphogypsum to improve the efficiency of the steam curing process. The steam curing equipment 300 includes a steam curing autoclave 8 and a trolley 1 for transporting intermediate products. A steam curing autoclave 8 can accommodate multiple trolleys 1. Because the steam curing cycle is long, a steam curing equipment 300 includes multiple steam curing autoclaves 8, so that the steam curing efficiency of the steam curing equipment 300 can match the production capacity of the granulation equipment 200.

[0046] In the steam curing process, the intermediate products are transported into the steam curing autoclave 8 through the trolley 1, and the steam curing autoclave 8 conducts steam curing treatment on the intermediate products in the trolley 1. The steam curing treatment requires high-temperature and low-pressure steam to contact the intermediate products, so that the phosphogypsum in the intermediate products is transformed into hemihydrate gypsum. The improvement of the steam curing process is located on the trolley 1. Vent holes 2 are provided on the trolley 1, so that steam can pass through the vent holes 2 and enter the trolley 1, increasing the path for steam to enter the trolley 1, enabling the steam to more efficiently and fully contact the intermediate products in the trolley 1, and improving the steam curing efficiency of the intermediate products.

[0047] The side walls and the bottom surface of the trolley 1 are made of steel plates, and the vent holes 2 are opened on the steel plates. For example, the trolley 1 includes four side walls and a first bottom surface, forming a cuboid-shaped car body. The inner part of the car body is a cavity for holding intermediate products, and the top of the car body is an opening for putting the intermediate products into the car body. Similarly, the side walls of the trolley 1 can also be made of other materials of plates.

[0048] The steel plates can be fixed by welding, and pedestal bearings can be provided at the bottom of the steel plates forming the bottom surface. The wheels 5 of the trolley 1 are connected to the steel plates forming the bottom surface through the pedestal bearings.

[0049] Alternatively, the trolley 1 includes a frame chassis formed by welding profiles. The wheels 5 are installed on the frame chassis, and the hopper is connected to the chassis by profiles that can move. The hopper can be fixed to the chassis by welding, or the hopper can also be fixed to the chassis by fasteners such as bolts. If the hopper is fixed by fasteners such as bolts

[0050] Vent holes 2 can be provided on the side walls of the trolley 1. Moreover, the vent holes 2 on the side walls of the trolley 1 can be provided on only one side wall, or can be provided on two, three or four side walls. Providing vent holes 2 on the side walls of the trolley 1 allows steam to directly contact the intermediate product at the inner side position of the trolley 1, reducing the time required for steam to contact the intermediate product at the side position of the trolley 1. Also, the steam entering from the side of the trolley 1 is closer to the bottom of the trolley 1, which can improve the contact efficiency between the steam and the intermediate product at the bottom of the trolley 1 and shorten the time required for the steam curing of the intermediate product.

[0051] Similarly, as Figure 7 shown, vent holes 2 can also be provided on the bottom surface of the trolley 1. When vent holes 2 are provided on the bottom surface of the trolley 1, steam can directly enter from the bottom of the trolley 1 and directly contact the lowermost intermediate product, without waiting for the steam to pass through the upper intermediate products, which can greatly improve the steam curing efficiency. After vent holes 2 are provided on the bottom surface of the trolley 1, it is only necessary to wait for the steam to fully contact the intermediate product at the center of the trolley 1. In this process, compared with the prior art where steam needs to penetrate to the position of the lowermost intermediate product, the time required for the steam to penetrate to the position of the intermediate product in the middle is less than half of the original, so the purpose of improving the steam curing efficiency can be achieved.

[0052] The vent holes 2 are preferably circular holes, and circular holes are more convenient for processing. Since the vent holes 2 are for steam to pass through, the shape of the vent holes 2 can also be other shapes, such as square holes, oval holes and other shapes.

[0053] To increase the steam throughput, vent holes 2 are provided on both the side walls and the bottom surface of the trolley 1, and a plurality of vent holes 2 are provided on both the side walls and the bottom surface. The plurality of vent holes 2 can be arranged in a rectangular array or in other ways.

[0054] When the existing granulator 201 processes the intermediate product, the intermediate product is usually made into granules with a diameter greater than 10 mm. Therefore, the diameter of the vent holes 2 is less than 10 mm to prevent the granular intermediate product from falling.

[0055] As Figure 8 and Figure 9As shown in the figure, connection parts 4 can be provided on the front and rear sides of the trolley 1, and the connection parts 4 are used to connect the trolleys 1 to each other. The connection part 4 includes a hinge rod, and a hinge hole 6 with a vertical axis is provided on the hinge rod. When two trolleys 1 are connected, the hinge holes 6 on the two trolleys 1 are coaxial, and a hinge shaft 7 can be used to pass through the hinge holes 6 to hinge-connect the two hinge rods, so as to connect the two trolleys 1 to each other. Similarly, connection parts 4 are provided on the front and rear sides of the trolley 1, enabling more than three trolleys 1 to be connected to each other.

[0056] It should be noted that the connection parts 4 on the front and rear sides of the trolley 1 are located at different heights respectively, so that the connection parts 4 of the two trolleys 1 can be offset up and down, so that the two hinge holes 6 can be in a coaxial position.

[0057] The movement of the trolley 1 can be towed by a tractor, and the tractor is connected to the connection part 4 of the trolley 1. The tractor can tow the trolley 1 into the autoclave 8. In the prior art, the autoclave 8 for processing intermediate products includes a horizontal autoclave 8. The horizontal autoclave 8 can accommodate multiple trolleys 1. Through the tractor, multiple interconnected trolleys 1 can be towed into the horizontal autoclave 8 at one time, reducing the number of tows and lowering the labor intensity and cost.

[0058] As an alternative implementation scheme, a buffer part is fixed on the outer side surface of the trolley 1 to prevent the trolley 1 from having a rigid collision with other equipment. The buffer part can be a rubber block 3. A number of rubber blocks 3 are arranged on the side surface of the trolley 1 along the circumferential direction. When the trolley 1 moves and contacts other equipment, it is also the rubber block 3 that contacts other equipment, avoiding the problem of damage to the trolley 1 or other equipment caused by rigid collision. The rubber block 3 can be fixed to the outer side surface of the trolley 1 through fasteners such as bolts. The rubber block 3 can be arranged at the junction of the two outer side surfaces of the trolley 1, or can be arranged at the upper edge, lower edge or the center position of the outer side surface. The buffer part can also be a rubber layer covering the outer side surface of the trolley 1. The rubber layer can be fixed to the trolley 1 through fasteners such as bolts, and through holes are opened at the positions corresponding to the ventilation holes 2 on the rubber layer to prevent the rubber layer from blocking the ventilation holes 2.

[0059] A storage bin 400 is arranged downstream of the steam curing and maintenance equipment 300, and a belt conveyor is arranged between the steam curing and maintenance equipment 300 and the storage bin 400. The intermediate product becomes a semi-finished product after being processed by the steam curing and maintenance equipment 300. The semi-finished product is poured from the trolley 1 onto the belt conveyor and is transported to the storage bin 400 through the belt conveyor for cooling and storage. The cooling of the semi-finished product can be natural cooling. During the cooling process, the hemihydrate gypsum in the semi-finished product combines with water to form dihydrate gypsum, meeting the standard for preparing the cement retarder. After the semi-finished product is converted into dihydrate gypsum, it can be used in downstream production to prepare the cement retarder. The technology for preparing the cement retarder from dihydrate gypsum adopts the prior art and will not be elaborated here.

Claims

1. A production system for producing a cement retarder from solid waste phosphogypsum, comprising a batching device (100), a granulating device (200), a steam curing device (300) and a storage bin (400). The batching device (100) is used to proportion raw materials, the granulating device (200) is used to granulate the raw materials into intermediate products, the steam curing device (300) is used to steam cure the intermediate products to form semi-finished products, and the storage bin (400) is used to store and cool the finished products; characterized in that, The steam curing equipment includes a steam curing kettle and a trolley (1). The trolley (1) is provided with a cavity for containing phosphogypsum. An opening is provided at the top of the trolley (1), and phosphogypsum enters the cavity through the opening. The trolley (1) is used to transport phosphogypsum into the steam curing kettle. The trolley (1) is provided with ventilation holes (2), and the ventilation holes (2) are used to pass steam.

2. The production system for producing a cement retarder from solid waste phosphogypsum according to claim 1, characterized in that, The ventilation holes (2) are provided on the bottom surface and / or side surface of the trolley (1).

3. The production system for producing a cement retarder from solid waste phosphogypsum according to claim 1, characterized in that, The diameter of the ventilation holes (2) is less than 10 mm.

4. The production system for producing a cement retarder from solid waste phosphogypsum according to claim 1, wherein, The trolley (1) is provided with a plurality of ventilation holes (2).

5. A production system for producing a cement retarder from solid waste phosphogypsum according to claim 1, characterized in that, Connecting parts (4) are respectively provided at the front and rear ends of the trolley (1), and each trolley (1) is connected through the connecting parts (4).

6. The production system for producing a cement retarder from solid waste phosphogypsum according to claim 5, characterized in that, It further includes a tractor, and the tractor is connected to the connecting part (4) of the trolley (1). The tractor is used to tow the trolley (1) and move it into the steam curing kettle.

7. The production system for producing a cement retarder from solid waste phosphogypsum according to claim 1, characterized in that, The trolley (1) is provided with a buffer part, and the buffer part is used to prevent the trolley (1) from having a rigid collision with the steam curing kettle.

8. A production system for producing a cement retarder from solid waste phosphogypsum according to claim 1, characterized in that, The side surface and the bottom surface of the trolley (1) are respectively made of steel plates, and the ventilation holes (2) are opened on the steel plates.

Images