A crushing and impurity removing integrated method and system for preparing cat litter from phosphogypsum waste residues

Abstract

This invention discloses an integrated crushing and impurity removal method and system for preparing cat litter from phosphogypsum waste, relating to the field of cat litter preparation technology. The system includes a frame with a crushing mechanism on its top surface and an impurity removal mechanism below it. Multiple processes—primary coarse crushing, secondary fine crushing, hot air drying and self-cleaning, electromagnetic removal of metal impurities, chemical spraying to remove soluble harmful substances, and negative pressure dust recovery—are integrated into a single frame connected in series. This integrated crushing and impurity removal system allows for continuous operation, eliminating the material transfer, feeding, and intermediate storage processes required between traditional separate equipment. This significantly shortens the production process, reduces manual handling costs, and solves the problems of poor production continuity and low production efficiency in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of cat litter preparation technology, specifically a method and system for the integrated crushing and impurity removal of phosphogypsum waste residue in the preparation of cat litter. Background Technology

[0002] Crushing and impurity removal refers to feeding the stockpiled phosphogypsum waste into crushing equipment for pulverization, breaking large pieces of phosphogypsum into small, uniform particles. Subsequently, impurities and residual soluble harmful impurities are removed through sorting, reducing the interference of large pieces of material and impurities on subsequent granulation processes, lowering the content of harmful substances in the finished cat litter, improving the purity of the phosphogypsum raw material, and laying the foundation for the subsequent preparation of qualified cat litter granules.

[0003] In the current process of preparing cat litter with phosphogypsum, the material needs to be transported to a separate impurity removal station after crushing. The crushing unit and the impurity removal equipment are arranged separately, and the material is transported back and forth, which increases the conveying process and occupies more production time. Manual material transport also increases labor costs. Conventional impurity removal relies only on simple magnetic attraction and screening, which cannot remove dust impurities and surface soluble harmful substances. The impurity removal method is single and the impurity removal effect is limited. The overall production continuity is poor, which restricts the production efficiency of phosphogypsum cat litter. Summary of the Invention

[0004] To address the problems mentioned in the background art, this invention proposes an integrated method and system for crushing and removing impurities from phosphogypsum waste to prepare cat litter.

[0005] The objective of this invention can be achieved through the following technical solution: an integrated crushing and impurity removal system for preparing cat litter from phosphogypsum waste, comprising a frame, a crushing mechanism on the top surface of the frame, and an impurity removal mechanism below the crushing mechanism;

[0006] The crushing mechanism includes a crushing chamber that is detachably sleeved on the top surface of the frame. The inner cavity of the crushing chamber is provided with two synchronous and reverse-rotating primary crushing rollers. The two primary crushing rollers mesh with each other. The inner wall of the crushing chamber is also provided with two connecting pipes. Each connecting pipe is provided with multiple air jets for drying and cleaning the primary crushing rollers.

[0007] The impurity removal mechanism includes an impurity removal chamber detachably connected to the bottom of the crushing chamber. Electromagnetic plates and connecting pipes 2 can be detachably installed on both inner walls of the impurity removal chamber. Multiple atomizing nozzles are provided on each connecting pipe 2. Two synchronous and reverse-rotating secondary crushing rollers are also provided in the impurity removal chamber. The two secondary crushing rollers mesh with each other and are located below the electromagnetic plates and connecting pipes 2.

[0008] A dust suction head and a blower are detachably installed on one side wall of the impurity removal bin. The dust suction head is located between the electromagnet plate and the connecting pipe. A guide baffle is also fixedly connected to the inner wall of the impurity removal bin. The blower and the guide baffle are both located below the secondary crushing roller.

[0009] As a further preferred embodiment of this technical solution: support plate one and support plate two are fixedly connected to both sides of the frame respectively; the two ends of each primary crushing roller are rotatably sleeved on the two side walls of the crushing chamber that are far apart from each other; a first gear is fixedly sleeved on the same end of each of the two primary crushing rollers, and the two first gears mesh with each other; a drive motor one is detachably installed on the outer wall of support plate one; the output end of drive motor one is detachably connected to the end of one of the primary crushing rollers; and a feed hopper is detachably connected to the top of the crushing chamber.

[0010] As a further preferred embodiment of this technical solution: two transmission rods are rotatably connected to one side wall of the crushing chamber, and a second gear is fixedly sleeved on the surface of each of the two transmission rods. The two second gears mesh with the two first gears respectively. A connecting plate is detachably connected to the inner walls of the two adjacent sides of the crushing chamber. A connecting block is fixedly connected to each of the two connecting plates. The two connecting pipes are detachably connected to the two connecting blocks respectively.

[0011] Two air supply pipes are fixedly sleeved on one side wall of the crushing chamber. The exhaust ends of the two air supply pipes are detachably connected to the air inlet ends of the two connecting pipes. A heating box is detachably connected to the air inlet end of each air supply pipe. A heating plate is detachably installed in the inner cavity of each heating box. A sealing cover is detachably connected to the side wall of each heating box away from the air supply pipe. A drive pipe is fixedly connected to the surface of each sealing cover. A rotating rod is rotatably connected to the inner cavity of each drive pipe. A synchronous pulley is fixedly connected to the end of each rotating rod away from the heating box. A synchronous pulley is fixedly connected to the end of each drive rod away from the crushing chamber. A synchronous belt is meshed on both synchronous pulleys. A spiral blade is fixedly sleeved on the circumferential surface of each rotating rod.

[0012] As a further preferred embodiment of this technical solution: each of the drive tubes can be detachably fitted with a filter plate, and the rotating rod is rotatably sleeved at the center of the filter plate.

[0013] Each of the jet heads can be detachably installed on the connecting pipe, and the jet direction of each jet head is towards the meshing point of the two primary crushing rollers.

[0014] As a further preferred embodiment of this technical solution: a pump body and a storage tank are detachably installed on the top surface of the support plate one. The inlet end of the pump body is detachably connected to the discharge end of the storage tank through a suction pipe. A three-way pipe is detachably installed on the discharge end of the pump body. Both discharge ends of the three-way pipe are detachably connected to delivery pipes. Both delivery pipes are fixedly sleeved on the outer wall of the impurity removal bin, and the discharge ends of the two delivery pipes are detachably connected to the inlet ends of two connecting pipes two respectively. Each atomizing nozzle is detachably installed on the connecting pipe two, and the spraying direction of each atomizing nozzle is towards the meshing point of the two secondary crushing rollers.

[0015] As a further preferred embodiment of this technical solution: the outer wall of the support plate can also be detachably installed with a material collection box and a negative pressure fan, the air inlet end of the negative pressure fan is detachably connected to the exhaust end of the material collection box, a filter plate can be detachably installed inside the material collection box, a material conveying pipe can be detachably connected to the material inlet end of the material collection box, the material inlet end of the material conveying pipe is detachably connected to the discharge end of the dust suction head, and the top plate of the material collection box is detachably installed.

[0016] As a further preferred embodiment of this technical solution: the two ends of each of the secondary crushing rollers are respectively rotatably sleeved on the two side walls of the impurity removal bin that are far apart from each other; a third gear is fixedly sleeved on the same end of each of the two secondary crushing rollers, and the two third gears mesh with each other; a second drive motor is detachably installed on the outer wall of the second support plate; and the output end of the second drive motor is detachably connected to the end of one of the secondary crushing rollers.

[0017] As a further preferred embodiment of this technical solution: an integrated method for crushing and removing impurities from phosphogypsum waste residue for preparing cat litter, comprising the following steps:

[0018] S1. The phosphogypsum waste residue is fed into the crushing chamber through the feeding hopper. The drive motor is started to drive a pair of primary crushing rollers to coarsely crush large pieces of raw material in the opposite direction. At the same time, the transmission rod and synchronous belt drive the rotating rod and spiral blades to draw air. The air is heated into hot air by the heating plate in the heating box. It is then sprayed from the air nozzle to the meshing part of the primary crushing roller through the air supply pipe and connecting pipe to dry the material and clean the material adhering to the roller surface.

[0019] S2. The material after primary crushing falls into the impurity removal bin by its own weight. When it falls, it passes through the magnetic field of the electromagnet plate, and the metal impurities in the raw material are adsorbed and retained.

[0020] S3. Turn on the pump body and send the neutralizing and cleaning solution in the storage tank into the connecting pipe 2 through the three-way pipe and the infusion pipe. The atomizing nozzle sprays the material to dissolve the soluble harmful impurities on the surface.

[0021] S4. The sprayed material falls into the meshing area of ​​the secondary crushing roller. Start the second drive motor and drive the secondary crushing roller in reverse through the third gear to crush it into uniform fine material suitable for cat litter granulation.

[0022] S5. Turn on the negative pressure fan and blower. The blower, together with the guide baffle, discharges the material and dust from both sides below the impurity removal bin. The dust suction head sucks up the dust under negative pressure. The dust-laden airflow enters the collection box through the conveying pipe. The filter plate retains the dust, and the clean air is discharged by the negative pressure fan.

[0023] S6. The pure phosphogypsum fines, which have undergone two-stage crushing and multiple impurity removal processes, are discharged from the bottom of the impurity removal bin along the guide baffle and directly fed into the downstream granulation equipment to complete integrated continuous processing.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. This invention integrates multiple processes—primary coarse crushing, secondary fine crushing, hot air drying and self-cleaning, electromagnetic removal of metal impurities, chemical spraying to remove soluble harmful substances, and negative pressure dust recovery—into a single frame connected in series. This integrated crushing and impurity removal process eliminates the material transfer, feeding, and intermediate storage processes between traditional separate equipment, significantly shortening the production process, reducing manual handling costs, and solving the problems of poor production continuity and low production efficiency in the prior art.

[0026] 2. In this invention, the crushing mechanism is equipped with a linkage hot air drying and cleaning system. It relies on the crushing roller's own power to synchronously deliver air for heating, without the need for an independent fan drive. The high-temperature hot air acts directionally on the crushing area, simultaneously achieving material drying, self-cleaning of the crushing roller to prevent sticking and clogging, stabilizing the coarse crushing operation, and is suitable for the treatment of high-moisture-content agglomerated phosphogypsum waste residue.

[0027] 3. In this invention, the impurity removal chamber integrates multiple impurity removal structures: an electromagnet plate removes hard metallic impurities, atomized spray dissolves soluble harmful components, negative pressure dust collection separates dust impurities, and a blower performs secondary dust removal. The synergistic effect of multiple impurity removal methods makes up for the shortcomings of traditional methods that rely solely on simple magnetic attraction and screening for impurity removal, resulting in limited impurity removal effects. This significantly improves the purity of phosphogypsum raw materials, reduces the content of harmful substances in finished cat litter, and ensures the quality of cat litter products. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0029] Figure 2 This is a schematic diagram of the crushing mechanism of the present invention;

[0030] Figure 3 This is a partial structural schematic diagram of the crushing mechanism of the present invention;

[0031] Figure 4 This is a schematic diagram of the impurity removal mechanism of the present invention;

[0032] Figure 5 This is a partial structural schematic diagram of the impurity removal mechanism of the present invention.

[0033] Legend:

[0034] 1. Frame; 2. Support plate one; 3. Support plate two; 4. Crushing mechanism; 5. Impurity removal mechanism;

[0035] 41. Crushing chamber; 42. Primary crushing roller; 43. First gear; 44. Transmission rod; 45. Second gear; 46. Drive motor 1; 47. Feed hopper; 48. Connecting plate 1; 49. Connecting block; 401. Connecting pipe 1; 402. Air nozzle; 403. Air supply pipe; 404. Heating box; 405. Sealing cover; 406. Drive pipe; 407. Filter plate 1; 408. Synchronous pulley 1; 409. Synchronous pulley 2; 410. Synchronous belt;

[0036] 51. Impurity removal bin; 52. Electromagnetic plate; 53. Connecting pipe II; 54. Atomizing nozzle; 55. Infusion pipe; 56. T-connector; 57. Pump body; 58. Storage bin; 59. Secondary crushing roller; 501. Third gear; 502. Drive motor II; 503. Dust suction head; 504. Conveying pipe; 505. Collection bin; 506. Negative pressure fan; 507. Blower; 508. Guide baffle. Detailed Implementation

[0037] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1-5 This application provides an integrated method and system for crushing and removing impurities in the preparation of cat litter from phosphogypsum waste residue, including a frame 1, a crushing mechanism 4 on the top surface of the frame 1, and an impurity removal mechanism 5 below the crushing mechanism 4.

[0039] The overall structure integrates the crushing mechanism 4 and the impurity removal mechanism 5 in series on the same frame 1, completely abandoning the traditional separate arrangement of crushing and impurity removal in phosphogypsum cat litter production. After being processed by the upper crushing mechanism 4, the phosphogypsum waste residue can fall directly into the lower impurity removal mechanism 5 without the need for intermediate transfer and conveying equipment, thus shortening the material flow path.

[0040] The crushing mechanism 4 includes a crushing chamber 41 that is detachably sleeved on the top surface of the frame 1. The inner cavity of the crushing chamber 41 is provided with two synchronous and reverse-rotating primary crushing rollers 42. The two primary crushing rollers 42 mesh with each other. The drive motor 46 outputs power to drive the rotation of one side of the primary crushing roller 42. Through the transmission of the meshing first gear 43, the two primary crushing rollers 42 synchronously and in reverse squeeze each other, completing the initial coarse crushing of large phosphogypsum waste residue, breaking down the large lumps of phosphogypsum piled up in the plant area into medium-sized materials, and preventing large hard lumps from directly entering the rear end and clogging the equipment.

[0041] The inner wall of the crushing chamber 41 is also provided with two connecting pipes 401, and each connecting pipe 401 is provided with multiple air jets 402 for drying and cleaning the primary crushing roller 42.

[0042] The jet head 402 continuously sprays high-temperature hot air toward the meshing crushing area of ​​the two primary crushing rollers 42. On the one hand, it dries the free moisture attached to the surface of the phosphogypsum raw material, preventing wet material from sticking to the tooth surface of the primary crushing rollers 42 and causing material blockage and reduced crushing efficiency; on the other hand, the high-speed airflow washes the gap between the roller teeth, clears the stuck phosphogypsum powder, and ensures that the primary crushing rollers 42 can operate stably for a long time.

[0043] The impurity removal mechanism 5 includes an impurity removal chamber 51 that is detachably connected to the bottom of the crushing chamber 41. The crushing chamber 41 and the impurity removal chamber 51 are directly connected and sealed. The phosphogypsum material after primary crushing falls vertically into the impurity removal chamber 51 by its own weight. The whole process is sealed and there is no dust leakage. At the same time, the transfer and conveying equipment is eliminated.

[0044] Electromagnetic plates 52 and connecting pipes 53 can be detachably installed on both inner walls of the impurity removal bin 51. When the electromagnetic plates 52 are energized, they generate a strong magnetic field. During the material falling, the material passes through the magnetic field area and accurately adsorbs magnetic impurities such as iron nails, iron wires, and metal fragments mixed in the phosphogypsum waste residue. This solves the problem that traditional screening cannot remove hard metal impurities and that metal impurities wear down the secondary crushing roller 59 at the rear end.

[0045] Each connecting pipe 2 53 is equipped with multiple atomizing nozzles 54. The storage tank 58 contains soluble harmful substances neutralizing cleaning solution, which is pressurized by the pump body 57 and transported to the connecting pipe 2 53. The atomizing nozzles 54 form a fine water mist that sprays down onto the phosphogypsum material, which fully dissolves the soluble salts and harmful soluble impurities attached to the surface of the raw material. This makes up for the shortcomings of traditional methods that rely solely on magnetic attraction and screening to remove impurities and cannot remove soluble harmful components.

[0046] The waste bin 51 is also equipped with two synchronous and reverse secondary crushing rollers 59. The two secondary crushing rollers 59 mesh with each other and are located below the electromagnet plate 52 and the connecting pipe 53.

[0047] After the magnetic removal and spray dissolution of impurities are completed, the material continues to fall into the meshing area of ​​the secondary crushing roller 59. The drive motor 502 drives the two secondary crushing rollers 59 to reverse and finely crush them through the third gear 501, processing the coarsely crushed phosphogypsum into fine particles with uniform particle size to match the raw material particle size requirements of the subsequent cat litter granulation process.

[0048] A dust suction head 503 and a blower 507 are detachably installed on one side wall of the dust removal bin 51. The dust suction head 503 is located between the electromagnet plate 52 and the connecting pipe 53. The negative pressure fan 506 continuously provides negative pressure suction to the collection box 505. The dust suction head 503 simultaneously extracts the fine dust raised during the spraying and magnetic suction process. The dust enters the collection box 505 through the conveying pipe 504. The internal filter plate 2 intercepts the dust particles, and the clean airflow is discharged, realizing the centralized collection of dust, eliminating production dust pollution, and simultaneously recovering usable phosphogypsum powder.

[0049] The inner wall of the waste bin 51 is also fixedly connected with a guide baffle 508. Both the blower 507 and the guide baffle 508 are located below the secondary crushing roller 59.

[0050] Blower 507 blows air horizontally, which, together with guide baffle 508, discharges materials and dust from both sides below the impurity removal bin 51, further improving the purity of the raw materials. Guide baffle 508 also serves to guide and collect materials, ensuring that the finished particles after crushing are discharged smoothly downwards.

[0051] Specifically, the frame 1 serves as the supporting foundation for the entire set of equipment. It adopts a split welded frame structure, with the crushing mechanism 4 and the impurity removal mechanism 5 installed in layers. This allows for convenient disassembly and maintenance. Support plate 1 2 and support plate 2 3 extend outwards to both sides of the frame 1, providing independent installation platforms for the supporting motor, pump body, material storage, and dust removal components. Each functional component is arranged in a separate area without interfering with each other, facilitating future maintenance and replacement of parts.

[0052] Furthermore, support plates 1 and 2 are fixedly connected to both sides of the frame 1, and the two ends of each primary crushing roller 42 are rotatably sleeved on the two side walls of the crushing chamber 41 that are far apart from each other. The same end of each of the two primary crushing rollers 42 is fixedly sleeved with a first gear 43, and the two first gears 43 mesh with each other. A single drive motor 1 46 can drive the two primary crushing rollers 42 to rotate synchronously in opposite directions, eliminating the need for dual motor synchronous control, reducing equipment energy consumption and control costs. The meshing first gear 43 has strong transmission synchronization, stable roller tooth meshing crushing gap, and uniform and controllable coarse crushing particle size.

[0053] The outer wall of the support plate 2 is detachably equipped with a drive motor 46. The output end of the drive motor 46 is detachably connected to the end of one of the primary crushing rollers 42. The drive motor 46 adopts a flange detachable connection structure, which can be quickly disassembled for inspection and replacement. Different power motors can be replaced when adapting to phosphogypsum waste residues of different hardness.

[0054] The top of the crushing chamber 41 is detachably connected to a feed hopper 47. The feed hopper 47 has a tapered structure that is wider at the top and narrower at the bottom, which increases the feed volume of raw materials and prevents the phosphogypsum waste from spilling during feeding. The feed hopper 47 is bolted to the crushing chamber 41 for easy cleaning of the internal clumps and accumulated materials.

[0055] Specifically, after the phosphogypsum raw material is fed into the hopper 47, the material falls directly into the meshing gap of the two primary crushing rollers 42. The primary crushing is completed by the squeezing and shearing of the roller teeth. At the same time, the hot air cleaning and drying system operates synchronously to achieve simultaneous crushing, drying and roller surface self-cleaning.

[0056] Furthermore, two transmission rods 44 are rotatably connected to one side wall of the crushing chamber 41. The surfaces of the two transmission rods 44 are fixedly fitted with second gears 45. The two second gears 45 mesh with the two first gears 43 respectively. When the first-stage crushing roller 42 is running, the first gears 43 synchronously drive the second gears 45 and the transmission rods 44 to rotate synchronously, realizing synchronous diversion of crushing power. There is no need to add an additional blower drive motor. The hot air supply structure is driven by the crushing system itself, simplifying the power configuration of the whole machine.

[0057] The inner walls of the crushing chamber 41 on both sides that are close to each other are detachably connected to connecting plates 48. Connecting blocks 49 are fixedly connected to both connecting plates 48. Two connecting pipes 401 are detachably connected to the two connecting blocks 49 respectively.

[0058] Connecting plate 48 and connecting block 49 provide support and positioning for connecting pipe 401. All are assembled with bolts and can be disassembled separately for cleaning blockages and replacing parts.

[0059] Two air supply pipes 403 are also fixedly sleeved on one side wall of the crushing chamber 41. The exhaust end of the two air supply pipes 403 is detachably connected to the air inlet end of the two connecting pipes 401 respectively. Each air supply pipe 403 can be detachably connected to a heating box 404. Each heating box 404 can be detachably installed with a heating plate in its inner cavity. After the outside air enters the heating box 404, the internal heating plate heats the air through convection to form high-temperature dry hot air. The hot air is transported to the connecting pipe 401 through the air supply pipe 403 and finally sprayed onto the crushing roller meshing area by the jet nozzle 402.

[0060] Each heating box 404 has a detachable sealing cover 405 on the side wall away from the gas supply pipe 403. After the sealing cover 405 is opened, the internal heating plate can be quickly removed for inspection and replacement. The sealing structure ensures that there is no leakage of hot air and improves drying efficiency.

[0061] Each sealing cover 405 has a fixed drive pipe 406 connected to its surface. Each drive pipe 406 has a rotating rod rotatably connected to its inner cavity. Each rotating rod has a synchronous pulley 408 fixedly connected to its end away from the heating box 404. Each transmission rod 44 has a synchronous pulley 409 fixedly connected to its end away from the crushing chamber 41. Synchronous pulley 408 and synchronous pulley 409 are meshed together with a synchronous belt 410. The transmission rod 44 rotates synchronously with the first-stage crushing roller. Synchronous pulley 409 drives synchronous pulley 408 and rotating rod to rotate synchronously through synchronous belt 410. Air delivery is achieved entirely by relying on the power of the crushing mechanism, eliminating the need for an independent fan drive unit.

[0062] Each rotating rod has a helical blade fixedly fitted onto its circumferential surface. The rotation of the rotating rod drives the helical blade to rotate at high speed, creating a negative pressure suction effect inside the drive tube 406, actively drawing in outside air and continuously sending it into the heating box 404, forming a continuous hot air supply cycle. The hot air volume is adjusted synchronously with the rotation speed of the crushing roller. When the material feed is large, the rotation speed of the crushing roller increases, and the air volume drawn in by the helical blade increases synchronously to meet the drying and cleaning requirements.

[0063] Specifically, the entire hot air supply system is linked to the primary crushing mechanism for start-stop operation. When the equipment is feeding and crushing, hot air is automatically and synchronously supplied for heating. When the machine stops, the hot air stops synchronously to avoid energy waste. The high-temperature hot air continuously acts on the crushing area, solving the problems of wet phosphogypsum sticking to the rollers and clogging the bin from the source.

[0064] Preferably, each drive tube 406 has a filter plate 407 detachably installed at its air inlet end, and the rotating rod is rotatably sleeved at the center of the filter plate 407.

[0065] Filter plate 407 intercepts dust and debris in the outside air, preventing impurities from entering the heating box 404 and attaching to the heating plate, thus reducing heating efficiency. It also prevents small, hard particles from wearing down the spiral blades. Filter plate 407 is removable, making it easy to clean the accumulated dust regularly.

[0066] Each jet head 402 can be detachably installed on the connecting pipe 401, and the jet direction of each jet head 402 is towards the meshing point of the two primary crushing rollers 42;

[0067] The directional jet design allows high-temperature hot air to be precisely applied to the core area of ​​material crushing. The hot air directly penetrates the material layer, maximizing the drying and dehydration effect. At the same time, the airflow directly washes the gap between the roller teeth, quickly blowing away stuck phosphogypsum particles and maintaining the smooth flow of the 42 crushing gap of the primary crushing roller.

[0068] Specifically, when the phosphogypsum waste residue has a high moisture content and is prone to clumping and sticking to the roller surface, the heating plate inside the heating box 404 can increase the heating power, increase the hot air temperature, and enhance the drying effect.

[0069] If there is slight material accumulation and blockage on the roller surface, the machine can be stopped and the jet nozzle 402 can be disassembled separately to clear the nozzle hole. The maintenance operation is simple and convenient.

[0070] Furthermore, a pump body 57 and a storage tank 58 are detachably installed on the top surface of the support plate 12. The inlet end of the pump body 57 is detachably connected to the discharge end of the storage tank 58 through a suction pipe. The storage tank 58 is used to store the cleaning and neutralizing agent solution. The pump body 57 provides high-pressure conveying power. The suction pipe is detachable, which facilitates emptying and replacement of cleaning agents with different functions.

[0071] The pump body 57 has a detachable three-way pipe 56 installed at the discharge end. Both discharge ends of the three-way pipe 56 are detachably connected to infusion pipes 55. Both infusion pipes 55 are fixedly sleeved on the outer wall of the impurity removal chamber 51, and the discharge ends of the two infusion pipes 55 are detachably connected to the inlet ends of the two connecting pipes 53 respectively. The three-way pipe 56 evenly delivers the cleaning solution to the two connecting pipes 53 on both sides, ensuring that the spraying on the left and right sides of the impurity removal chamber 51 is uniform and there are no dead corners. All infusion pipelines are quick-release connected, which facilitates the unblocking of pipeline blockages.

[0072] Each atomizing nozzle 54 can be detachably installed on the connecting pipe 2 53. The spray direction of each atomizing nozzle 54 is towards the meshing point of the two secondary crushing rollers 59. After the liquid is atomized, it is directly sprayed onto the phosphogypsum particles that fall through the magnetic attraction area. The fine droplets fully coat the surface of the material, dissolving and neutralizing the soluble harmful salts in the phosphogypsum. The sprayed material immediately enters the secondary crushing roller 59 for fine crushing. During the crushing process, the material rubs and rolls, further improving the contact between the liquid and the material and enhancing the impurity removal effect.

[0073] Specifically, in response to the differences in the content of harmful impurities in different batches of phosphogypsum waste, the amount of atomized spraying agent can be controlled by adjusting the output flow rate of pump 57. When the impurity content is high, the spray flow rate can be increased to improve the degree of impurity removal and purification, thus solving the shortcomings of traditional equipment in removing soluble harmful substances and the excessive levels of harmful substances in finished cat litter.

[0074] Furthermore, the outer wall of the support plate 12 can also be detachably installed with a material collection box 505 and a negative pressure fan 506. The air inlet of the negative pressure fan 506 is detachably connected to the exhaust end of the material collection box 505. The negative pressure fan 506 continuously draws away the air inside the material collection box 505 to form a negative pressure, providing dust suction power for the dust suction head 503.

[0075] The collection box 505 is equipped with a detachable filter plate 2. The filter plate 2 traps the extracted phosphogypsum dust, preventing the dust from directly entering the negative pressure fan 506 and causing wear on the fan impeller. At the same time, it recovers fine powder that can be reused.

[0076] The feed end of the collection box 505 is detachably connected to the conveying pipe 504. The feed end of the conveying pipe 504 is detachably connected to the discharge end of the dust suction head 503. The conveying pipe 504 conveys the dust-mixed airflow collected by the dust suction head 503. The pipe can be disassembled and separated to clean the dust accumulated inside the pipe.

[0077] The top plate of the collection box 505 is detachable;

[0078] Simply open the top panel to quickly remove the filter plate and clean the accumulated dust.

[0079] Specifically, the dust collection and removal process is carried out simultaneously with the spraying and magnetic suction impurity removal. The dust generated by the falling materials is extracted in real time. The entire set of equipment is sealed for dust removal, so there is no dust flying in the production site. At the same time, the recovered powder reduces raw material waste and meets the production requirements for the resource utilization of solid waste.

[0080] Furthermore, the two ends of each secondary crushing roller 59 are respectively rotatably sleeved on the two side walls of the impurity removal bin 51 that are far apart from each other. The same end of each of the two secondary crushing rollers 59 is fixedly sleeved with a third gear 501, and the two third gears 501 mesh with each other. A single drive motor 502 drives the two secondary crushing rollers 59 to synchronously reverse fine crushing by meshing with the third gear 501. The gap between the roller teeth is smaller than that of the primary crushing roller 42, so as to realize the secondary fine crushing of the material and produce fine phosphogypsum raw material with uniform particle size.

[0081] The outer wall of the support plate 2 3 is detachably equipped with a drive motor 2 502, and the output end of the drive motor 2 502 is detachably connected to the end of one of the secondary crushing rollers 59.

[0082] Drive motor 2, 502, is independently arranged on support plate 2, 3, and is isolated from drive motor 1, 46, so that maintenance does not interfere with each other. The detachable flange connection structure facilitates quick disassembly and replacement of the motor.

[0083] Furthermore, an integrated crushing and impurity removal method for preparing cat litter from phosphogypsum waste includes the following steps:

[0084] S1. The phosphogypsum waste residue to be processed is fed into the crushing chamber 41 through the feeding hopper 47. The drive motor 46 is started to drive the two primary crushing rollers 42 to rotate synchronously in opposite directions to perform primary coarse crushing of large pieces of phosphogypsum. At the same time, the transmission rod 44 and the synchronous belt 410 drive the rotating rod and the spiral blade to draw in outside air. The air is heated by the heating plate inside the heating box 404 to form hot air. The hot air is transported to the jet nozzle 402 through the air supply pipe 403 and the connecting pipe 401 to continuously spray high-temperature hot air into the meshing crushing area of ​​the primary crushing rollers 42 to dry the moisture of the material and clean the powder adhering to the roller surface.

[0085] S2. The medium-sized phosphogypsum material after primary crushing falls vertically to the impurity removal bin 51 below by its own weight. During the falling process, the material first passes through the strong magnetic field area formed by the electromagnet plates 52 on both sides. The metallic magnetic impurities mixed in the material are adsorbed and intercepted by the electromagnet plates 52, thus completing the removal of metallic impurities.

[0086] S3. Start the pump body 57 and transport the impurity neutralization and cleaning solution inside the storage tank 58 through the three-way pipe 56 and the infusion pipe 55 to the connecting pipe 2 53. The atomizing nozzle 54 sprays the atomized cleaning solution evenly onto the falling material to fully dissolve the soluble harmful impurities on the surface of the material.

[0087] S4. After spraying, the material continues to fall into the meshing area of ​​the two secondary crushing rollers 59. The drive motor 502 is started, and the secondary crushing rollers 59 are driven to rotate synchronously in the opposite direction through the third gear 501 to perform secondary fine crushing of the material and process it into uniform fine particles suitable for cat litter granulation.

[0088] S5. Start the negative pressure fan 506 and blower 507. Blower 507 blows air horizontally, which, together with the guide baffle 508, discharges the material and dust from both sides below the impurity removal bin 51. The dust suction head 503 continuously sucks up the dust under negative pressure between the electromagnet plate 52 and the atomizing nozzle 54. The dust-mixed airflow is sent into the collection box 505 through the conveying pipe 504. The filter plate 2 intercepts and collects the dust, and the clean air is discharged by the negative pressure fan 506.

[0089] S6. After two-stage crushing, magnetic adsorption impurity removal, chemical spraying to remove soluble impurities, and dust separation, the pure phosphogypsum fine particles are guided along the guide baffle 508 to the bottom discharge port of the impurity removal bin 51 and discharged directly to the downstream cat litter granulation equipment to complete the integrated continuous processing of crushing and impurity removal.

[0090] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. An integrated crushing and impurity removal system for preparing cat litter from phosphogypsum waste, comprising a frame (1), characterized in that: The top surface of the frame (1) is provided with a crushing mechanism (4), and the bottom of the crushing mechanism (4) is provided with a cleaning mechanism (5). The crushing mechanism (4) includes a crushing chamber (41) that is detachably sleeved on the top surface of the frame (1). The inner cavity of the crushing chamber (41) is provided with two synchronous and reverse-rotating primary crushing rollers (42). The two primary crushing rollers (42) mesh with each other. The inner wall of the crushing chamber (41) is also provided with two connecting pipes (401). Each connecting pipe (401) is provided with multiple air jets (402) for drying and cleaning the primary crushing rollers (42). The impurity removal mechanism (5) includes an impurity removal chamber (51) detachably connected to the bottom of the crushing chamber (41). Electromagnetic plates (52) and connecting pipes (53) are detachably installed on both inner walls of the impurity removal chamber (51). Each connecting pipe (53) is provided with multiple atomizing nozzles (54). The impurity removal chamber (51) is also provided with two synchronous and reverse-rotating secondary crushing rollers (59). The two secondary crushing rollers (59) mesh with each other, and the secondary crushing rollers (59) are located below the electromagnetic plates (52) and connecting pipes (53). A dust suction head (503) and a blower (507) are detachably installed on one side wall of the impurity removal bin (51). The dust suction head (503) is located between the electromagnet plate (52) and the connecting pipe (53). A guide baffle (508) is also fixedly connected to the inner wall of the impurity removal bin (51). The blower (507) and the guide baffle (508) are both located below the secondary crushing roller (59).

2. The integrated crushing and impurity removal system for preparing cat litter from phosphogypsum waste as described in claim 1, characterized in that, The frame (1) is fixedly connected to two sides of a support plate 1 (2) and a support plate 2 (3). The two ends of each primary crushing roller (42) are rotatably sleeved on the two side walls of the crushing chamber (41) that are far apart from each other. The same end of each of the two primary crushing rollers (42) is fixedly sleeved with a first gear (43), and the two first gears (43) mesh with each other. The outer wall of the support plate 1 (2) is detachably installed with a drive motor 1 (46). The output end of the drive motor 1 (46) is detachably connected to the end of one of the primary crushing rollers (42). The top of the crushing chamber (41) is detachably connected with a feed hopper (47).

3. The integrated crushing and impurity removal system for preparing cat litter from phosphogypsum waste as described in claim 2, characterized in that, Two transmission rods (44) are rotatably connected to one side wall of the crushing chamber (41). The surfaces of the two transmission rods (44) are fixedly fitted with second gears (45). The two second gears (45) mesh with the two first gears (43) respectively. The inner walls of the two sides of the crushing chamber (41) that are close to each other are detachably connected with connecting plates (48). The two connecting plates (48) are fixedly connected with connecting blocks (49). The two connecting pipes (401) are detachably connected to the two connecting blocks (49) respectively. Two air supply pipes (403) are fixedly sleeved on one side wall of the crushing chamber (41). The exhaust ends of the two air supply pipes (403) are detachably connected to the air inlet ends of the two connecting pipes (401). A heating box (404) is detachably connected to the air inlet end of each air supply pipe (403). A heating plate is detachably installed in the inner cavity of each heating box (404). A sealing cover (405) is detachably connected to the side wall of each heating box (404) away from the air supply pipe (403). The surface of each drive tube (405) is fixedly connected to a drive tube (406). The inner cavity of each drive tube (406) is rotatably connected to a rotating rod. The end of each rotating rod away from the heating box (404) is fixedly connected to a synchronous pulley (408). The end of each transmission rod (44) away from the crushing chamber (41) is fixedly connected to a synchronous pulley (409). The synchronous pulley (408) and the synchronous pulley (409) are meshed together with a synchronous belt (410). The circumferential surface of each rotating rod is fixedly fitted with a spiral blade.

4. The integrated crushing and impurity removal system for preparing cat litter from phosphogypsum waste as described in claim 3, characterized in that, Each of the drive tubes (406) has a filter plate (407) detachably installed at its air inlet end, and the rotating rod is rotatably sleeved at the center of the filter plate (407). Each of the jet heads (402) can be detachably installed on the connecting pipe (401), and the jet direction of each jet head (402) is towards the meshing point of the two primary crushing rollers (42).

5. The integrated crushing and impurity removal system for preparing cat litter from phosphogypsum waste as described in claim 2, characterized in that, The top surface of the support plate (2) is detachably equipped with a pump body (57) and a storage tank (58). The inlet end of the pump body (57) is detachably connected to the discharge end of the storage tank (58) through a suction pipe. The discharge end of the pump body (57) is detachably equipped with a three-way pipe (56). Both discharge ends of the three-way pipe (56) are detachably connected to a delivery pipe (55). Both delivery pipes (55) are fixedly sleeved on the outer wall of the impurity removal bin (51). The discharge ends of the two delivery pipes (55) are detachably connected to the inlet ends of the two connecting pipes (53). Each atomizing nozzle (54) is detachably installed on the connecting pipe (53). The spraying direction of each atomizing nozzle (54) is towards the meshing point of the two secondary crushing rollers (59).

6. The integrated crushing and impurity removal system for preparing cat litter from phosphogypsum waste as described in claim 5, characterized in that, The outer wall of the support plate (2) can also be detachably installed with a collection box (505) and a negative pressure fan (506). The air inlet of the negative pressure fan (506) is detachably connected to the exhaust end of the collection box (505). The collection box (505) is detachably installed with a filter plate (2). The feed end of the collection box (505) is detachably connected with a conveying pipe (504). The feed end of the conveying pipe (504) is detachably connected to the discharge end of the dust suction head (503). The top plate of the collection box (505) is detachably installed.

7. The integrated crushing and impurity removal system for preparing cat litter from phosphogypsum waste as described in claim 6, characterized in that, The two ends of each of the secondary crushing rollers (59) are respectively rotatably sleeved on the two side walls of the impurity removal bin (51) that are far apart from each other. The same end of each of the two secondary crushing rollers (59) is fixedly sleeved with a third gear (501), and the two third gears (501) mesh with each other. The outer wall of the support plate (3) is detachably installed with a drive motor (502), and the output end of the drive motor (502) is detachably connected to the end of one of the secondary crushing rollers (59).

8. A method for integrated crushing and impurity removal in the preparation of cat litter from phosphogypsum waste, applied to the integrated crushing and impurity removal system for preparing cat litter from phosphogypsum waste as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. The phosphogypsum waste residue is fed into the crushing chamber (41) through the feeding hopper (47). The drive motor (46) is started to drive a pair of primary crushing rollers (42) to coarsely crush large pieces of raw material in the opposite direction. At the same time, the transmission rod (44) and the synchronous belt (410) drive the rotating rod and the spiral blade to draw air. The air is heated into hot air by the heating plate in the heating box (404). It is sprayed from the air supply pipe (403) and the connecting pipe (401) to the meshing part of the primary crushing rollers (42) through the jet nozzle (402) to dry the material and clean the material adhering to the roller surface. S2. The material after primary crushing falls into the impurity removal bin (51) by its own weight. When it falls, it passes through the magnetic field of the electromagnet plate (52), and the metal impurities in the raw material are adsorbed and retained. S3. Turn on the pump body (57) and send the neutralizing and cleaning solution in the storage tank (58) into the connecting pipe (53) through the three-way pipe (56) and the infusion pipe (55). Spray the material with the atomizing nozzle (54) to dissolve the soluble harmful impurities on the surface. S4. The sprayed material falls into the meshing area of ​​the secondary crushing roller (59). The second drive motor (502) is started, and the secondary crushing roller (59) is driven to reverse and finely crushed through the third gear (501) to obtain uniform fine material suitable for cat litter granulation. S5. Turn on the negative pressure fan (506) and blower (507). The blower (507) works with the guide baffle (508) to discharge the material and dust from both sides below the impurity removal bin (51). The dust suction head (503) sucks up the dust under negative pressure. The dust-laden airflow enters the collection box (505) through the conveying pipe (504). The filter plate traps the dust, and the clean air is discharged by the negative pressure fan (506). S6. The pure phosphogypsum fine material, which has undergone two-stage crushing and multiple impurity removal, is discharged from the bottom of the impurity removal bin (51) along the guide baffle (508) and directly sent to the back-end granulation equipment to complete the integrated continuous processing.

Images