Method for producing building gypsum powder from phosphogypsum

Abstract

The application discloses a method for producing building gypsum powder from phosphogypsum, and relates to the technical field of gypsum powder. The vertical clinker impact crusher is arranged on the top of a base, support seats are fixedly connected to the two sides of the top of the base, and the two opposite sides are fixedly connected with the two sides of the vertical clinker impact crusher. The method comprises the following steps: automatically classifying the pre-pulverized materials through a self-regrinding mechanism, automatically returning and regrinding the coarse blocks screened by the self-regrinding mechanism, intermittently collecting and conveying the qualified fine materials through a material collecting mechanism, and continuously dispersing the agglomerated powder materials through a loosening and spreading mechanism. The method integrates the processes of classification, circulation pulverization, material collecting and transferring, and material loosening, and eliminates the external return lifting and independent dispersing equipment, thereby simplifying the pretreatment process and ensuring the uniform particle size of the gypsum powder.

Description

Technical Field

[0001] This invention relates to the field of gypsum powder technology, specifically to a method for producing building gypsum powder using phosphogypsum. Background Technology

[0002] Phosphogypsum is a major solid waste product of the phosphoric acid industry. After being calcined into gypsum clinker, it can be processed into building gypsum powder, which is a mainstream path for solid waste resource utilization. The clinker is prone to agglomeration after calcination, so crushing and screening are key steps in preparing qualified gypsum powder.

[0003] Traditional phosphogypsum crushing processes have significant shortcomings: the crushing and screening units are independent of each other, lacking a convenient automatic return and re-crushing structure for coarse materials. After a single crushing and screening, the large pieces of clinker that are screened out need to be manually transported back to the crusher for secondary crushing, which is a cumbersome process. The remaining coarse pieces cannot be continuously recycled and crushed, resulting in uneven particle size of the finished product, which directly affects the strength and workability of building gypsum.

[0004] To overcome the above-mentioned shortcomings, a method for producing building gypsum powder using phosphogypsum is proposed to solve the existing problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method for producing building gypsum powder using phosphogypsum, which solves the problem that the lack of a convenient automatic coarse material recirculation and re-crushing structure in the equipment leads to the inability to continuously circulate and crush the coarse lumps remaining on the screen.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for producing building gypsum powder from phosphogypsum, specifically comprising the following steps:

[0007] Step 1: Pre-crushing of gypsum clinker. The clinker blocks are fed into the interior of the vertical clinker impact crusher at the top of the base for crushing.

[0008] Step 2: Gypsum clinker re-crushing. The material discharged from the vertical clinker impact crusher is screened by the self-re-crushing mechanism, and the remaining fragments are automatically fed back into the vertical clinker impact crusher for further crushing.

[0009] Step 3: Plaster material transfer; The fine material received by the collection frame is transferred through the material collection mechanism, and the material to be transferred is intermittently collected at the same time during the transfer.

[0010] Step 4: Loosening gypsum material: The loosening and spreading mechanism continuously loosens and spreads the material to be transported that gathers around the spiral transmission shaft in the material collection mechanism.

[0011] Preferably, the vertical clinker impact crusher is mounted on the top of the base. Support seats are fixedly connected to both sides of the top of the base, and the two opposite sides are respectively fixedly connected to the two sides of the vertical clinker impact crusher. A collection frame is fixedly connected to the top of the base. A return hopper and a discharge port are respectively connected to the top and bottom of the vertical clinker impact crusher. A self-re-crushing mechanism for use with the vertical clinker impact crusher is provided on the top of the base. A material collection mechanism is provided inside the collection frame. A loose and evenly distributed mechanism adapted to the material collection mechanism is provided inside the collection frame.

[0012] Preferably, the self-resetting crushing mechanism includes a rotary screen frame, which is rotatably mounted on the top of the base. A plurality of partition baffles are fixedly connected at equal intervals around the inner wall of the rotary screen frame. A plurality of screening holes are opened on the inner wall of the rotary screen frame between adjacent partition baffles. A gear ring is fixedly connected to the surface of the rotary screen frame. A first motor is fixedly connected to the top of the base via a bracket. The output shaft of the first motor is fixedly connected to a rotating shaft via a coupling. One end of the rotating shaft is rotatably connected to the top of the base via a bracket. A gear meshing with the gear ring is fixedly connected to the surface of the rotating shaft. Two opposing sides of the support seats are jointly fixedly connected to an inner ring frame adapted to the rotary screen frame via a bracket. The top and bottom of the inner ring frame are provided with material inlets adapted to the reflux hopper and the discharge port.

[0013] Preferably, the material collection mechanism includes a reciprocating screw section, which is formed on the surface of the rotating shaft. A threaded movable sleeve is slidably connected to the surface of the reciprocating screw section. A pusher plate is fixedly connected to one side of the threaded movable sleeve by a bracket, and one end of the pusher plate extends into the interior of the collection frame.

[0014] The inside of the collection box is fixedly connected to a transmission cylinder by a bracket. A second motor is installed on the top of the transmission cylinder. The output shaft of the second motor is fixedly connected to a spiral transmission shaft by a coupling, and one end of the spiral transmission shaft extends into the inside of the transmission cylinder.

[0015] Preferably, the loose distribution mechanism includes a conical storage hopper, which is fixedly connected to the bottom of the collection frame and communicates with the interior of the collection frame. Several material feeding rods are fixedly connected at equal intervals around the surface of the spiral transmission shaft and inside the conical storage hopper.

[0016] Preferably, both sides of the rear side of the collection frame are fixedly connected to limiting slide rods, the surfaces of the limiting slide rods are slidably connected to limiting sleeves, and the bottom of the limiting sleeves is fixedly connected to the top of the pusher plate.

[0017] Preferably, the rear side of the collection frame has a movable opening that slides and adapts to the pusher plate.

[0018] Preferably, an arc-shaped baffle is fixedly connected to the top of the base and to the outer surface of the rotary screen frame.

[0019] Preferably, the rear side of the reflux hopper is connected to a feed hopper.

[0020] Preferably, a transfer pipe is connected to the front side of the transfer cylinder.

[0021] Beneficial effects

[0022] This invention provides a method for producing building gypsum powder using phosphogypsum. Compared with existing technologies, it has the following advantages:

[0023] (1) The method for producing building gypsum powder using phosphogypsum is to set up a self-re-crushing mechanism, a material collection mechanism and a loosening and spreading mechanism. The pre-crushed material is automatically graded by the self-re-crushing mechanism. The coarse lumps remaining on the screen are automatically returned to the self-re-crushing mechanism for re-crushing. The qualified fine material is intermittently collected and transported by the material collection mechanism. At the same time, the loosening and spreading mechanism continuously disperses the agglomerated powder, completing the multiple processes of grading, circulating crushing, material collection and transfer and material loosening in one integrated manner. This eliminates the need for external return lifting and independent dispersing equipment, simplifies the pretreatment process, and ensures that the gypsum powder has a uniform particle size.

[0024] (2) The method of producing building gypsum powder using phosphogypsum is to set up a linkage transmission structure, so that the self-crushing mechanism, the material collection mechanism and the loosening and spreading mechanism share the same power shaft and operate synchronously. There is no need to equip each process with a separate drive motor, which reduces the number of transmission parts, reduces the energy consumption of the whole machine, and avoids material accumulation and blockage caused by misalignment of multiple drive sequences, thereby increasing the continuous running time of the equipment.

[0025] (3) The method of producing building gypsum powder using phosphogypsum forms a sliding limit support for the material collection mechanism by setting a limit slide bar, a limit slide sleeve and a movable opening to cooperate with each other, so that the material collection mechanism runs smoothly during the reciprocating pushing process, effectively preventing the pushing parts from deviating and jamming, ensuring the continuous and smooth action of material intermittent collection and conveying, and reducing the frequency of equipment shutdown and maintenance. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the external structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the external structure of the present invention from another perspective;

[0028] Figure 3 This is a schematic diagram (a) of the self-recovery crushing mechanism structure of the present invention.

[0029] Figure 4 This is a schematic diagram (II) of the self-recovery crushing mechanism structure of the present invention;

[0030] Figure 5 This is a schematic diagram of the material feeding mechanism structure of the present invention;

[0031] Figure 6 This is a schematic diagram of the limiting slide bar and limiting sleeve structure of the present invention.

[0032] In the diagram: 1. Base; 2. Support seat; 3. Vertical clinker impact crusher; 4. Collection frame; 5. Return hopper; 6. Feed port; 7. Self-resetting crushing mechanism; 701. Rotary screen frame; 702. Dividing baffle; 703. Screening hole; 704. Gear ring; 705. First motor; 706. Rotating shaft; 707. Gear; 708. Inner ring frame; 709. Feed port; 8. Material collection mechanism; 801. Reciprocating screw section; 802. Threaded movable sleeve; 803. Push plate; 804. Transmission cylinder; 805. Second motor; 806. Spiral transmission shaft; 9. Loosening and spreading mechanism; 901. Conical storage hopper; 902. Pushing rod; 10. Limiting slide bar; 11. Limiting slide sleeve; 12. Movable port; 13. Arc-shaped baffle; 14. Feed hopper; 15. Transfer pipe. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0034] Please see Figures 1-6 This invention provides a technical solution: a method for producing building gypsum powder using phosphogypsum, specifically including the following steps:

[0035] Step 1: Pre-crushing of gypsum clinker. The clinker blocks are fed into the vertical clinker impact crusher 3 at the top of the base 1 for crushing.

[0036] The specific operating steps are as follows: the calcined clinker is fed into the feed hopper 14, and then the material enters the interior of the return hopper 5 through the feed hopper 14, and enters the interior of the vertical clinker impact crusher 3 along the return hopper 5. The vertical clinker impact crusher 3 then crushes the material, and the crushed material is discharged from the discharge port 6.

[0037] Step 2: Gypsum clinker re-crushing. The material discharged from the outlet of the vertical clinker impact crusher 3 is screened through the self-re-crushing mechanism 7, and the remaining fragments are automatically fed back into the vertical clinker impact crusher 3 for re-crushing.

[0038] The specific operating steps are as follows: During the discharge process at the discharge port 6, the material will be discharged into the interior of the rotary screen frame 701. At this time, the first motor 705 is started. The first motor 705 drives the gear 707 to rotate through the rotating shaft 706. The rotation of the gear 707 meshes with the gear ring 704, causing the rotary screen frame 701 to rotate. During the rotation of the rotary screen frame 701, the material will be distributed between two adjacent partition baffles 702.

[0039] When the rotary screen frame 701 receives materials, the screening holes 703 inside the rotary screen frame 701 will screen the materials. The filtered fine materials enter the inside of the collection frame 4, while the coarse materials are trapped inside the rotary screen frame 701. Through the rotation of the rotary screen frame 701, the coarse materials are driven back into the return hopper 5 for secondary crushing.

[0040] Step 3: Plaster material transfer; The fine material received by the collection frame 4 is transferred through the material collection mechanism 8, and the material to be transferred is intermittently collected at the same time.

[0041] The specific operating steps are as follows: Start the second motor 805, the second motor 805 drives the spiral transmission shaft 806 to rotate, causing the spiral transmission shaft 806 to continuously transfer the material inside the collection frame 4 to the next process. Secondly, during the process of the first motor 705 driving the rotating shaft 706 to rotate, the rotating shaft 706 will also drive the reciprocating screw part 801 to rotate. The reciprocating screw part 801 rotates the threaded movable sleeve 802 on its surface to move back and forth. The moving threaded movable sleeve 802 drives the pusher plate 803 to push the material back and forth inside the collection frame 4, causing the material to continuously gather at the transmission cylinder 804.

[0042] Step 4: Loosening gypsum material: The loosening and spreading mechanism 9 continuously loosens and spreads the material to be transported around the spiral transmission shaft 806 in the material collection mechanism 8.

[0043] The specific operating steps are as follows: During the process of the pusher plate 803 pushing the material, the material continuously falls into the interior of the conical storage hopper 901. During this period, the rotation of the spiral transmission shaft 806 will also drive the material pusher rod 902 to rotate. The rotation of the material pusher rod 902 will disperse the material and spread it evenly around the periphery of the transmission cylinder 804.

[0044] The vertical clinker impact crusher 3 is set on the top of the base 1. Support seats 2 are fixedly connected to both sides of the top of the base 1, and the two opposite sides are fixedly connected to the two sides of the vertical clinker impact crusher 3 respectively. A collection frame 4 is fixedly connected to the top of the base 1. The top and bottom of the vertical clinker impact crusher 3 are respectively connected to a return hopper 5 and a discharge port 6. The rear side of the return hopper 5 is connected to a feed hopper 14.

[0045] In a preferred embodiment, to achieve automatic grading of crushed materials and automatic return of coarse materials to the vertical clinker impact crusher 3 for re-crushing without external force, a self-re-crushing mechanism 7 for use with the vertical clinker impact crusher 3 is provided on the top of the base 1. The self-re-crushing mechanism 7 includes a rotary screen frame 701, which is rotatably mounted on the top of the base 1. Several partition baffles 702 are fixedly connected at equal intervals around the inner wall of the rotary screen frame 701. Several screening holes 703 are opened on the inner wall of the rotary screen frame 701 between adjacent partition baffles 702. A gear ring 704 is fixedly connected to the surface of the rotary screen frame 701. A first motor 705 is fixedly connected to the top via a bracket. The output shaft of the first motor 705 is fixedly connected to a rotating shaft 706 via a coupling. One end of the rotating shaft 706 is rotatably connected to the top of the base 1 via a bracket. A gear 707 that meshes with a gear ring 704 is fixedly connected to the surface of the rotating shaft 706. An inner ring frame 708 that is adapted to the rotary screen frame 701 is fixedly connected to the opposite side of the two support seats 2 via a bracket. The top and bottom of the inner ring frame 708 are provided with a material passage 709 that is adapted to the return hopper 5 and the discharge port 6. An arc-shaped baffle 13 is fixedly connected to the top of the base 1 and to the outer surface of the rotary screen frame 701.

[0046] In a preferred embodiment, in order to intermittently reciprocate and stably transport the qualified fine material after screening to the next process, a material collection mechanism 8 is provided inside the collection frame 4. The material collection mechanism 8 includes a reciprocating screw part 801, which is opened on the surface of the rotating shaft 706. A threaded movable sleeve 802 is slidably connected to the surface of the reciprocating screw part 801. A pusher plate 803 is fixedly connected to one side of the threaded movable sleeve 802 through a bracket, and one end of the pusher plate 803 extends into the interior of the collection frame 4. A transmission cylinder 804 is fixedly connected to the interior of the collection frame 4 through a bracket. A second motor 805 is installed on the top of the transmission cylinder 804. The output shaft of the second motor 805 is fixedly connected to a spiral transmission shaft 806 through a coupling, and one end of the spiral transmission shaft 806 extends into the interior of the transmission cylinder 804. A transfer pipe 15 is connected to the front side of the transmission cylinder 804.

[0047] Both sides of the rear side of the collection frame 4 are fixedly connected to the limiting slide rods 10. The surface of the limiting slide rods 10 is slidably connected to the limiting slide sleeves 11, and the bottom of the limiting slide sleeves 11 is fixedly connected to the top of the push plate 803. The rear side of the collection frame 4 is provided with an active opening 12 that is slidably adapted to the push plate 803.

[0048] In a preferred embodiment, in order to break up agglomerated gypsum powder before material conveying and prevent material from caking and blocking the conveying channel, the inside of the collection frame 4 is provided with a loosening and spreading mechanism 9 adapted to the material gathering mechanism 8. The loosening and spreading mechanism 9 includes a conical storage hopper 901, which is fixedly connected to the bottom of the collection frame 4 and is connected to the inside of the collection frame 4. Several material pushing rods 902 are fixedly connected at equal intervals around the surface of the spiral transmission shaft 806 and inside the conical storage hopper 901.

Claims

1. A method for producing building gypsum powder using phosphogypsum, characterized in that: Specifically, the following steps are included: Step 1: Pre-crushing of gypsum clinker. The clinker blocks are fed into the interior of the vertical clinker impact crusher (3) at the top of the base (1) for crushing. Step 2: Gypsum clinker re-crushing. The material discharged from the outlet of the vertical clinker impact crusher (3) is screened by the self-re-crushing mechanism (7), and the remaining fragments are automatically fed back into the interior of the vertical clinker impact crusher (3) for re-crushing. Step 3: Transfer of gypsum material; The fine material received by the collection box (4) is transferred through the material collection mechanism (8), and the material to be transferred is intermittently collected at the same time; Step 4: Loosening of gypsum material: The material to be transported gathered around the spiral transmission shaft (806) in the material collection mechanism (8) is continuously loosened and evenly distributed by the loosening and spreading mechanism (9).

2. The method for producing building gypsum powder from phosphogypsum according to claim 1, characterized in that: The vertical clinker impact crusher (3) is located on the top of the base (1). Support seats (2) are fixedly connected to both sides of the top of the base (1), and the two opposite sides are fixedly connected to the two sides of the vertical clinker impact crusher (3). A collection frame (4) is fixedly connected to the top of the base (1). The top and bottom of the vertical clinker impact crusher (3) are respectively connected to a return hopper (5) and a discharge port (6). A self-re-crushing mechanism (7) is provided on the top of the base (1) to be used in conjunction with the vertical clinker impact crusher (3). A material collection mechanism (8) is provided inside the collection frame (4). A loose and evenly distributed mechanism (9) adapted to the material collection mechanism (8) is provided inside the collection frame (4).

3. The method for producing building gypsum powder from phosphogypsum according to claim 1, characterized in that: The self-repairing crushing mechanism (7) includes a rotary screen frame (701), which is rotatably mounted on the top of the base (1). A plurality of partition baffles (702) are fixedly connected at equal intervals around the inner wall of the rotary screen frame (701). A plurality of screening holes (703) are opened on the inner wall of the rotary screen frame (701) between adjacent partition baffles (702). A gear ring (704) is fixedly connected to the surface of the rotary screen frame (701). A first motor (705) is fixedly connected to the top of the base (1) via a bracket. The output shaft of a motor (705) is fixedly connected to a rotating shaft (706) via a coupling, and one end of the rotating shaft (706) is rotatably connected to the top of the base (1) via a bracket. A gear (707) meshing with a gear ring (704) is fixedly connected to the surface of the rotating shaft (706). The two support seats (2) are fixedly connected to an inner ring frame (708) adapted to the rotary screen frame (701) via a bracket on opposite sides. The top and bottom of the inner ring frame (708) are provided with a material passage (709) adapted to the return hopper (5) and the discharge port (6).

4. A method for producing building gypsum powder from phosphogypsum according to claim 2, characterized in that: The material collection mechanism (8) includes a reciprocating screw section (801), which is opened on the surface of the rotating shaft (706). A threaded movable sleeve (802) is slidably connected to the surface of the reciprocating screw section (801). A pusher plate (803) is fixedly connected to one side of the threaded movable sleeve (802) by a bracket, and one end of the pusher plate (803) extends into the interior of the collection frame (4). The inside of the collection box (4) is fixedly connected to the transmission cylinder (804) by a bracket. A second motor (805) is installed on the top of the transmission cylinder (804). The output shaft of the second motor (805) is fixedly connected to a spiral transmission shaft (806) by a coupling, and one end of the spiral transmission shaft (806) extends into the inside of the transmission cylinder (804).

5. A method for producing building gypsum powder from phosphogypsum according to claim 3, characterized in that: The loose distribution mechanism (9) includes a conical storage hopper (901), which is fixedly connected to the bottom of the collection frame (4) and is connected to the interior of the collection frame (4). Several material feeding rods (902) are fixedly connected around the surface of the spiral transmission shaft (806) and inside the conical storage hopper (901) at equal intervals.

6. A method for producing building gypsum powder from phosphogypsum according to claim 3, characterized in that: Both sides of the rear side of the collection box (4) are fixedly connected to the limiting slide rod (10), and the surface of the limiting slide rod (10) is slidably connected to the limiting sleeve (11), and the bottom of the limiting sleeve (11) is fixedly connected to the top of the push plate (803).

7. A method for producing building gypsum powder from phosphogypsum according to claim 3, characterized in that: The rear side of the collection box (4) is provided with an active opening (12) that is slidably adapted to the pusher plate (803).

8. A method for producing building gypsum powder from phosphogypsum according to claim 2, characterized in that: An arc-shaped baffle (13) is fixedly connected to the top of the base (1) and to the outer surface of the rotary screen frame (701).

9. A method for producing building gypsum powder from phosphogypsum according to claim 1, characterized in that: The backflow hopper (5) is connected to the feed hopper (14) on its rear side.

10. A method for producing building gypsum powder from phosphogypsum according to claim 3, characterized in that: The front side of the transmission tube (804) is connected to the transfer pipe (15).

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