An intelligent feeding and mixing system for phosphogypsum-cement mixture

Abstract

The application relates to an intelligent feeding and mixing system of a phosphogypsum-cement mixture, a discharge outlet of a phosphogypsum crushing device is connected with a feeding inlet of a block separation device through a second conveying caterpillar, the discharge outlet of the block separation device comprises a phosphogypsum powder discharge outlet and a phosphogypsum block discharge outlet; the phosphogypsum block discharge outlet is connected with the feeding inlet of the phosphogypsum crushing device through a first conveying caterpillar, the phosphogypsum powder discharge outlet is sequentially connected with a spraying device, a cement feeding device and a stirring bin through a third conveying caterpillar; and a discharge outlet of the stirring bin is connected with a feeding inlet of a bin through a fourth conveying caterpillar. The application has the beneficial effects that the application is a pretreatment technology for phosphogypsum roadbed filler application, and comprises a pretreatment production line scheme and a device. The production system of the application is simple in structure, can realize intelligent control, saves labor cost and has strong popularization.

Description

Technical Field

[0001] This invention relates to the field of phosphogypsum solid waste treatment technology, and more specifically, to an intelligent feeding and mixing system for phosphogypsum-cement mixture. Background Technology

[0002] Waste is a resource in the wrong place. By using alkali activation and cement modification processes, phosphogypsum can be prepared into a phosphogypsum-cement mixture for road base construction, realizing the resource utilization of solid waste. This method not only has a large capacity for phosphogypsum disposal but also produces no new pollutants, and should be widely promoted. However, because phosphogypsum slag contains incompletely removed phosphoric acid, it can corrode metal containers and, if directly mixed with cement, affect the cement hydration effect. Therefore, it is necessary to adopt a suitable feeding sequence and a mixing process and equipment compatible with prefabrication. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an intelligent feeding and mixing system for phosphogypsum-cement mixture.

[0004] In the first aspect, an intelligent feeding and mixing system for phosphogypsum-cement mixture is provided, including: a phosphogypsum crushing device, a block separation device, a spraying device, a cement feeding device, a mixing bin, and a silo.

[0005] The discharge port of the phosphogypsum crushing device is connected to the feeding port of the block separation device via a second conveyor belt. The discharge port of the block separation device includes a phosphogypsum powder discharge port and a phosphogypsum agglomerate discharge port. The phosphogypsum agglomerate discharge port is connected to the feeding port of the phosphogypsum crushing device via a first conveyor belt. The phosphogypsum powder discharge port is sequentially connected to a spraying device, a cement feeding device, and a mixing bin via a third conveyor belt. The discharge port of the mixing bin is connected to the inlet of the silo via a fourth conveyor belt.

[0006] Preferably, the phosphogypsum crushing device consists of a first corrosion-resistant metal chamber, a first load-bearing support, an electric rotating shaft, three layers of crushing impellers, and a quantitative discharge port; the three layers of crushing impellers and the electric rotating shaft are arranged in the corrosion-resistant metal chamber for crushing lumpy phosphogypsum; the discharge speed of the quantitative discharge port is controlled by the operating system.

[0007] Preferably, the block separation device consists of a second corrosion-resistant metal silo, a second load-bearing support, a phosphogypsum feeding port, a phosphogypsum powder discharge port, a phosphogypsum agglomerate discharge port, a screen, and a vibrator; a screen is provided in the second corrosion-resistant metal silo on the side near the phosphogypsum powder discharge port; the discharge speed of the phosphogypsum powder discharge port and the phosphogypsum agglomerate discharge port is controlled by the operating system.

[0008] Preferably, the spraying device consists of a spraying operation chamber, a liquid raw material chamber, a liquid volume meter, an alkali activator feeding port, a volume controller, and a spray nozzle; the alkali activator in the liquid raw material chamber is a NaOH solution or a Ca(OH)2 solution; the liquid discharge rate of the volume controller is controlled by the operating system.

[0009] Preferably, the cement feeding device consists of a third corrosion-resistant metal silo, a third load-bearing support, a cement feeding port, and a cement discharge port; the discharge speed of the cement discharge port is controlled by the operating system.

[0010] Preferably, the mixing chamber consists of a fourth corrosion-resistant metal chamber body, a fourth load-bearing support, mixing rollers, vibrating plates, partitions, and a mixture outlet; the vibrating plates and mixing rollers are arranged in the fourth corrosion-resistant metal chamber body and are used to mix the unmixed mixture; the discharge speed of the mixture outlet is controlled by the operating system.

[0011] Secondly, a method for operating the intelligent feeding and mixing system described in any of the first aspects is provided, including:

[0012] Step 1: Add lumpy phosphogypsum to the phosphogypsum crushing device. The lumpy phosphogypsum is crushed to produce raw phosphogypsum.

[0013] Step 2: The raw phosphogypsum is conveyed to the phosphogypsum feeding port of the block separation device via the second conveyor belt, and is separated into lumpy phosphogypsum and powdered phosphogypsum by the block separation device; the lumpy phosphogypsum is conveyed to the feeding port of the phosphogypsum crushing device via the first conveyor belt; the powdered phosphogypsum is conveyed to the spraying device via the third conveyor belt.

[0014] Step 3: The spraying device sprays an alkaline activator onto the powdered phosphogypsum in stages to neutralize the acidic substances in the powdered phosphogypsum, thereby achieving alkaline activation and making the pH value of the precipitate of the powdered phosphogypsum greater than or equal to 1.

[0015] Step 4: Add cement to the alkali-activated powdered phosphogypsum through the cement feeding device to form an unmixed mixture.

[0016] Step 5: Mix the unmixed mixture in the mixing chamber to obtain a mixed mixture;

[0017] Step 6: The mixed material is conveyed to the silo via the fourth conveyor belt.

[0018] The beneficial effects of this invention are as follows: This invention is a pretreatment technology for the application of phosphogypsum as a roadbed filler, including a pretreatment production line scheme and device. This invention achieves alkali activation of phosphogypsum and cement solidification through multi-stage feeding, avoiding the adverse effects of acidic substances in phosphogypsum on cement solidification compared to single-stage feeding. Furthermore, this production system has a simple structure, can achieve intelligent control, saves labor costs, and has strong scalability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an intelligent feeding and mixing system for phosphogypsum-cement mixture;

[0020] Figure 2 This is a schematic diagram of a phosphogypsum pulverizing device;

[0021] Figure 3 This is a schematic diagram of the block separation device;

[0022] Figure 4 This is a schematic diagram of the spray device.

[0023] Figure 5 This is a schematic diagram of a cement feeding device.

[0024] Figure 6 This is a schematic diagram of the mixing chamber; Reference numerals: 1. Phosphogypsum crushing device; 11. First corrosion-resistant metal chamber; 12. First load-bearing support; 13. Electric rotating shaft; 14. Three-layer crushing impeller; 15. Quantitative discharge port; 2. Block separation device; 21. Second corrosion-resistant metal chamber; 22. Second load-bearing support; 23. Phosphogypsum feeding port; 24. Phosphogypsum powder discharge port; 25. Phosphogypsum agglomerate discharge port; 3. Spraying device; 31. Spraying operation chamber; 32. Liquid raw material chamber; 33. Liquid volumetric meter. 3. Alkali activator feeding port 34. Volume controller 35. Sprayer 36. Cement feeding device 4. Third corrosion-resistant metal silo 41. Third load-bearing support 42. Cement feeding port 43. Cement discharge port 44. Mixing silo 5. Fourth corrosion-resistant metal silo 51. Fourth load-bearing support 52. Mixing roller 53. Vibrating plate 54. Baffle 55. Mixed material discharge port 56. Silo 6. First conveyor belt 7. Second conveyor belt 8. Third conveyor belt 9. Fourth conveyor belt 10. Detailed Implementation

[0025] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0026] Example 1:

[0027] like Figure 1 As shown, Embodiment 1 of this application provides an intelligent feeding and mixing system for phosphogypsum-cement mixtures. By selecting a suitable feeding sequence and mixing process, efficient and intelligent mixing of phosphogypsum-concrete is achieved. Specifically, as shown... Figure 1 As shown, the intelligent feeding and mixing system includes: 1. phosphogypsum crushing device, 2. block separation device, 3. spraying device, 4. cement feeding device, 5. mixing bin, and 6.

[0028] The discharge port of the phosphogypsum crushing device 1 is connected to the feeding port of the block separation device 2 via the second conveyor belt 8. The discharge port of the block separation device 2 includes a phosphogypsum powder discharge port 24 and a phosphogypsum agglomerate discharge port 25. The phosphogypsum agglomerate discharge port 25 is connected to the feeding port of the phosphogypsum crushing device 1 via the first conveyor belt 7. The phosphogypsum powder discharge port 24 is sequentially connected to the spraying device 3, the cement feeding device 4, and the mixing chamber 5 via the third conveyor belt 9. The discharge port of the mixing chamber 5 is connected to the feeding port of the silo 6 via the fourth conveyor belt 10.

[0029] Example 2:

[0030] Based on Example 1, Example 2 of this application provides a more specific intelligent feeding and mixing system for phosphogypsum-cement mixtures, including: a phosphogypsum crushing device 1, a block separation device 2, a spraying device 3, a cement feeding device 4, a mixing bin 5, and a silo 6. The transfer and transportation of semi-finished products and raw materials throughout the feeding and mixing process are completed by a tracked system, and the entire process is intelligently controlled through a computer program.

[0031] like Figures 2 to 5 As shown, the phosphogypsum crushing device 1 consists of a first corrosion-resistant metal chamber 11, a first load-bearing support 12, an electric rotating shaft 13, a three-layer crushing impeller 14, and a quantitative discharge port 15. The three-layer crushing impeller 14 and the electric rotating shaft 13 are arranged inside the corrosion-resistant metal chamber 11 for crushing lumpy phosphogypsum. The discharge speed of the quantitative discharge port 15 is controlled by the operating system, which can achieve precise quantitative feeding.

[0032] The block separation device 2 consists of a second corrosion-resistant metal silo 21, a second load-bearing support 22, a phosphogypsum feeding port 23, a phosphogypsum powder discharge port 24, a phosphogypsum agglomerate discharge port 25, a screen 26, and a vibrator 27. A screen 26 is provided inside the second corrosion-resistant metal silo 21 on the side near the phosphogypsum powder discharge port 24. The discharge speed of the phosphogypsum powder discharge port 24 and the phosphogypsum agglomerate discharge port 25 is controlled by the operating system, which can achieve precise quantitative feeding.

[0033] The spraying device 3 consists of a spraying operation chamber 31, a liquid raw material chamber 32, a liquid volume meter 33, an alkali activator inlet 34, a volume controller 35, and a nozzle 36. The alkali activator in the liquid raw material chamber 32 is a NaOH solution or a Ca(OH)2 solution. The alkali activator is sprayed from the nozzle 36 onto the powdered phosphorus slag on the conveyor belt 9 to neutralize the acidic substances therein, thus achieving alkali activation. The liquid discharge rate of the volume controller 35 can be controlled by the operating system, enabling precise quantitative feeding.

[0034] The cement feeding device 4 consists of a third corrosion-resistant metal silo 41, a third load-bearing support 42, a cement feeding port 43, and a cement discharge port 44; the discharge speed of the cement discharge port 44 is controlled by the operating system.

[0035] The mixing chamber 5 consists of a fourth corrosion-resistant metal chamber 51, a fourth load-bearing support 52, a mixing roller 53, a vibrating plate 54, a partition 55, and a mixture outlet 56. The vibrating plate 54 and the mixing roller 53 are installed inside the fourth corrosion-resistant metal chamber 51 to mix the unmixed mixture. The discharge speed of the mixture outlet 56 is controlled by the operating system.

[0036] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0037] Example 3:

[0038] Based on Examples 1 and 2, Example 3 of this application provides a working method for an intelligent feeding and mixing system, including:

[0039] Step 1: Add lumpy phosphogypsum to phosphogypsum crushing device 1. The lumpy phosphogypsum is crushed to produce raw phosphogypsum.

[0040] Step 2: The raw phosphogypsum is conveyed to the phosphogypsum feeding port 23 of the block separation device 2 via the second conveyor belt 8, and is separated into lumpy phosphogypsum and powdered phosphogypsum by the block separation device 2; the lumpy phosphogypsum is conveyed to the feeding port of the phosphogypsum crushing device 1 via the first conveyor belt 7; the powdered phosphogypsum is conveyed to the spraying device 3 via the third conveyor belt 9.

[0041] Step 3: The spraying device 3 sprays an alkaline activator onto the powdered phosphogypsum by feeding it in one go or in several batches, neutralizing the acidic substances in the powdered phosphogypsum and achieving alkaline activation; the amount (concentration or volume) of the alkaline activator needs to be designed according to the pH value of the phosphogypsum precipitate, and the pH value of the precipitate of the powdered phosphogypsum should be greater than or equal to 8.

[0042] Step 4: Cement is added to the alkali-activated powdered phosphogypsum through the cement feeding device 4 to form an unmixed mixture.

[0043] Step 5: Mix the unmixed mixture using the mixing chamber 5 to obtain a mixed mixture;

[0044] Step 6: The mixed material is transported to the silo 6 for temporary storage via the fourth conveyor belt 10.

[0045] In summary, under the control of the operating system, cement, powdered phosphogypsum, and alkali activator can be accurately and quantitatively added to the mixing chamber 5, and finally, through effective mixing, a high-quality phosphogypsum-cement mixture is obtained.

[0046] Specifically, the method provided in this embodiment is the method corresponding to the device provided in Embodiments 1 and 2. Therefore, the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

Claims

1. A working method of an intelligent feeding and mixing system of a phosphogypsum-cement mixture, characterized in that, Intelligent feeding and mixing system of phosphogypsum-cement mixture is adopted, and the system comprises a phosphogypsum crushing device (1), a block separation device (2), a spraying device (3), a cement feeding device (4), a stirring bin (5) and a bin (6); The discharge outlet of the phosphogypsum crushing device (1) is connected with the feeding inlet of the block separation device (2) through a second conveying caterpillar (8), the discharge outlet of the block separation device (2) comprises a phosphogypsum powder discharge outlet (24) and a phosphogypsum block discharge outlet (25); the phosphogypsum block discharge outlet (25) is connected with the feeding inlet of the phosphogypsum crushing device (1) through a first conveying caterpillar (7), and the phosphogypsum powder discharge outlet (24) is sequentially connected with the spraying device (3), the cement feeding device (4) and the stirring bin (5) through a third conveying caterpillar (9); the discharge outlet of the stirring bin (5) is connected with the feeding inlet of the bin (6) through a fourth conveying caterpillar (10); the phosphogypsum crushing device (1) comprises a first corrosion-resistant metal bin body (11), a first load-bearing support (12), an electric rotating shaft (13), a three-layer crushing impeller (14) and a quantitative discharge outlet (15); the three-layer crushing impeller (14) and the electric rotating shaft (13) are arranged in the first corrosion-resistant metal bin body (11) and used for crushing the blocky phosphogypsum; the discharge speed of the quantitative discharge outlet (15) is controlled by an operation system; the block separation device (2) comprises a second corrosion-resistant metal bin body (21), a second load-bearing support (22), a phosphogypsum feeding inlet (23), a phosphogypsum powder discharge outlet (24), a phosphogypsum block discharge outlet (25), a screen (26) and a vibration exciter (27); the screen (26) is arranged on one side of the second corrosion-resistant metal bin body (21) close to the phosphogypsum powder discharge outlet (24); the discharge speeds of the phosphogypsum powder discharge outlet (24) and the phosphogypsum block discharge outlet (25) are controlled by the operation system; the spraying device (3) comprises a spraying operation bin (31), a liquid raw material bin (32), a liquid volume meter (33), an alkali activator feeding inlet (34), a volume controller (35) and a spray head (36); the alkali activator in the liquid raw material bin (32) is NaOH solution or Ca(OH)2 solution; the liquid discharge speed of the volume controller (35) is controlled by the operation system; the cement feeding device (4) comprises a third corrosion-resistant metal bin body (41), a third load-bearing support (42), a cement feeding inlet (43) and a cement discharge outlet (44); the discharge speed of the cement discharge outlet (44) is controlled by the operation system; the stirring bin (5) comprises a fourth corrosion-resistant metal bin body (51), a fourth load-bearing support (52), a stirring roller (53), a vibrating sheet (54), a partition plate (55) and a mixture discharge outlet (56); the vibrating sheet (54) and the stirring roller (53) are arranged in the fourth corrosion-resistant metal bin body (51) and used for stirring the un-stirred mixture; the discharge speed of the mixture discharge outlet (56) is controlled by the operation system; and the working method of the intelligent feeding and mixing system comprises the following steps: Step 1, put the agglomerated phosphogypsum into the phosphogypsum crushing device (1), and the agglomerated phosphogypsum is crushed into the original phosphogypsum; Step 2, the original phosphogypsum is transported to the phosphogypsum feeding port (23) of the block separation device (2) through the second conveying belt (8), and is separated by the block separation device (2) to obtain agglomerated phosphogypsum and powder phosphogypsum; the agglomerated phosphogypsum is transported to the feeding port of the phosphogypsum crushing device (1) through the first conveying belt (7); the powder phosphogypsum is transported to the spraying device (3) through the third conveying belt (9); Step 3, the spraying device (3) sprays alkaline activator to the powder phosphogypsum by batch feeding, neutralizes the acidic substances of the powder phosphogypsum, realizes alkali activation, and makes the pH value of the powder phosphogypsum greater than or equal to 8; Step 4, add cement to the powder phosphogypsum after alkali activation through the cement feeding device (4) to form unmixed mixture; Step 5, mix the unmixed mixture through the stirring bin (5) to obtain mixed mixture; Step 6, the mixed mixture is transported to the silo (6) through the fourth conveying belt (10).

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