Production device and production method of building gypsum powder

Abstract

The invention discloses a production device and a production method of building gypsum powder, and the device comprises a hammer type beater used for removing water attached to the surface of desulfurized gypsum; the calcining furnace is used for carrying out two-step calcining on the desulfurized gypsum to remove crystal water of 3 / 2 of dihydrate gypsum in the desulfurized gypsum, so that the dihydrate gypsum is changed into semi-hydrated gypsum, and calcined gypsum is obtained; the ball mill is used for grinding the calcined gypsum; and the cooler is used for cooling the ground calcined gypsum. According to the device provided by the invention, attached water on the outer surface of the desulfurized gypsum is removed through the hammer type beater before the desulfurized gypsum is calcined, and the desulfurized gypsum is ground through the ball mill and aged through the aging bin after being calcined, so that the content of anhydrous gypsum in the calcined gypsum is reduced, the content of dihydrate gypsum in the calcined gypsum is reduced, and the content of semi-hydrated gypsum in the calcined gypsum is improved; the quality stability of building gypsum is improved, the product quality is improved, and stable raw material guarantee is provided for stable production of a production line.

Description

Technical Field

[0001] The invention relates to the technical field of gypsum powder production, and in particular to a production device and a production method for building gypsum powder. Background Art

[0002] In the gypsum board production line, the quality of raw materials is crucial, especially the main raw materials. The main raw material of gypsum board is gypsum powder, that is, semi-hydrated gypsum. Semi-hydrated gypsum is mainly obtained by dehydrating dihydrate gypsum, and a small part of semi-hydrated gypsum is obtained by absorbing water from anhydrous gypsum. As a result, the gypsum actually produced often contains a small amount of dihydrate gypsum and a small amount of anhydrous gypsum. The content of semi-hydrated gypsum in gypsum directly affects the quality stability of gypsum powder, thereby affecting the quality of subsequent building materials.

[0003] At present, in order to avoid incomplete dehydration of dihydrate gypsum, direct calcination is usually adopted in the production of gypsum, which easily leads to a higher content of anhydrous gypsum in the gypsum and reduces the content of hemihydrate gypsum in the gypsum, affecting the quality of gypsum powder and thus affecting the quality of subsequent construction materials. Summary of the invention

[0004] The object of the present invention is to provide a production device and a production method for building gypsum powder, so as to solve the technical problem that the content of semi-hydrated gypsum in the produced gypsum in the prior art is low.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] In a first aspect of the present invention, a production device for building gypsum powder is provided, comprising:

[0007] Hammer type dispersing machine is used to remove the water attached to the surface of desulfurized gypsum;

[0008] The calcining furnace performs two-step calcination on the desulfurized gypsum to remove 3 / 2 of the crystal water of the dihydrate gypsum in the desulfurized gypsum, so that the dihydrate gypsum becomes hemihydrate gypsum to obtain gypsum;

[0009] A ball mill is used to grind the calcined plaster of Paris;

[0010] A cooler to cool the ground plaster of Paris;

[0011] Aging warehouse, for storing and aging the cooled plaster of Paris to control the content of hemihydrate gypsum in the plaster of Paris;

[0012] Among them, the hammer disperser, calcining furnace, ball mill, cooler and aging bin are arranged in sequence, and the desulfurized gypsum passes through the hammer disperser, calcining furnace, ball mill, cooler and aging bin in sequence through bucket lifting.

[0013] Furthermore, the specific surface area of ​​the gypsum after being ground by a ball mill is 4200-4500cm 3 / g.

[0014] Furthermore, a first air chute is provided between the cooler and the aging bin, and the gypsum falls into the aging bin through the first air chute. A discharge port is provided at the bottom of the aging bin, and a second air chute is provided at the bottom of the discharge port. A bucket elevator is provided on one side of the aging bin, and the output end of the second air chute is connected to the input end of the bucket elevator.

[0015] Furthermore, the output end of the bucket elevator is connected to a three-way pipe, and a zipper machine is provided between one of the outlets of the three-way pipe and the inlet of the aging bin, so that the gypsum discharged from the aging bin passes through the bucket elevator and the zipper machine in sequence and returns to the aging bin again, thereby realizing multiple mixing of the gypsum.

[0016] Furthermore, a rotating shaft is provided inside the aging bin, a motor is connected to the top of the rotating shaft, a hollow main pipe is connected to the bottom of the rotating shaft, and a hollow branch pipe connected to the outer surface of the hollow main pipe is connected to the hollow main pipe. When the output shaft of the motor rotates, the hollow main pipe and the hollow branch pipe are driven to rotate through the rotating shaft, thereby stirring the gypsum powder inside the aging bin.

[0017] Furthermore, a box body is rotatably connected to the top of the outer surface of the hollow main pipe, and the hollow main pipe is in communication with the box body;

[0018] An air pump is provided on one side of the aging bin, the input end of the air pump is connected to the aging bin, and the output end of the air pump is connected to the box body;

[0019] The bottoms of the hollow main pipe and the hollow branch pipe are both provided with openings, and the outer surfaces of the hollow main pipe and the hollow branch pipe are both provided with air holes;

[0020] The air pump sucks the air inside the aging bin and then discharges it to the box body, and then the gas is ejected from the opening and the air holes to make the gas inside the aging bin circulate.

[0021] Furthermore, a cover body is fixedly connected to the inner wall of the hollow branch pipe, the central axis of the cover body coincides with the central axis of the hollow branch pipe, and the hollow branch pipe is arranged to be inclined downward;

[0022] The top diameter of the cover body is greater than the bottom diameter thereof.

[0023] Furthermore, a dispersion disk is fixedly connected to the outer surface of the rotating shaft, and the end of the dispersion disk close to the rotating shaft is higher than the end away from the rotating shaft. The gypsum powder falls from the top of the aging bin onto the rotating dispersion disk, and then falls evenly into the interior of the aging bin.

[0024] In a second aspect of the present invention, a method for producing building gypsum powder is provided, using the above-mentioned production device for building gypsum powder, comprising the following steps:

[0025] The desulfurized gypsum is transported to the inside of the hammer-type disperser to remove the water attached to the surface of the desulfurized gypsum;

[0026] Then, the desulfurized gypsum with the surface water removed is transported to a calcining furnace for secondary calcination to remove 3 / 2 of the crystal water of the dihydrate gypsum in the desulfurized gypsum, so that the dihydrate gypsum is converted into hemihydrate gypsum to obtain gypsum.

[0027] The calcined plaster of Paris is transported to the ball mill for grinding to reduce the particle size of the plaster of Paris;

[0028] The ground plaster of Paris is transported to the cooler for cooling;

[0029] The cooled plaster of Paris is transported to the aging bin for storage and aging to control the content of hemihydrate gypsum in the plaster of Paris.

[0030] Furthermore, when the plaster of Paris is aged, the plaster of Paris in the aging bin is continuously output and then input into the aging bin, so as to achieve multiple mixing of the plaster of Paris.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The device provided by the present invention removes attached water on the outer surface of the desulfurized gypsum by a hammer-type disperser before calcining the desulfurized gypsum, and grinds it by a ball mill and ages it in an aging bin after calcining, thereby reducing the content of anhydrous gypsum in the plaster of paris, reducing the content of dihydrate gypsum in the plaster of paris, increasing the content of hemihydrate gypsum in the plaster of paris, improving the quality stability of the building gypsum, improving the product quality, and providing a guarantee for the stability of raw materials for the stable production of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 It is a schematic diagram of the connection structure between the aging bin and the bucket elevator of the present invention;

[0036] Figure 3 It is a structural schematic diagram of the aging bin of the present invention;

[0037] Figure 4 It is a cross-sectional view of the hollow branch pipe of the present invention;

[0038] Figure 5 It is a schematic diagram of the connection structure between the hollow main pipe and the box body of the present invention.

[0039] The numbers in the figure represent the following:

[0040] 1. Hammer type disperser; 2. Calcination furnace; 3. Ball mill; 4. Cooler; 5. Aging bin; 6. First air chute; 7. Discharge port; 8. Second air chute; 9. Bucket elevator; 10. Tee pipe; 11. Zipper machine; 12. Rotating shaft; 13. Motor; 14. Hollow main pipe; 15. Hollow branch pipe; 16. Box body; 17. Air pump; 18. Opening; 19. Air hole; 20. Cover body; 21. Dispersion disc. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] like Figure 1 and Figure 2 As shown, the present invention provides a production device for building gypsum powder, comprising:

[0043] Hammer type dispersing machine 1, used to remove water attached to the surface of desulfurized gypsum;

[0044] Calcining furnace 2, calcining the desulfurized gypsum in two steps, removing 3 / 2 of the crystal water of the dihydrate gypsum in the desulfurized gypsum, so that the dihydrate gypsum is converted into hemihydrate gypsum to obtain gypsum;

[0045] Ball mill 3, grinding the calcined plaster of Paris;

[0046] Cooler 4, for cooling the ground plaster of Paris;

[0047] Aging bin 5, for storing and aging the cooled plaster of Paris to control the content of hemihydrate gypsum in the plaster of Paris;

[0048] Among them, the hammer disperser 1, calcining furnace 2, ball mill 3, cooler 4 and aging bin 5 are arranged in sequence, and the desulfurized gypsum passes through the hammer disperser 1, calcining furnace 2, ball mill 3, cooler 4 and aging bin 5 in sequence through bucket lifting.

[0049] At present, in order to avoid incomplete dehydration of dihydrate gypsum, direct calcination is usually adopted in the production of gypsum, which easily leads to a higher content of anhydrous gypsum in the gypsum and reduces the content of hemihydrate gypsum in the gypsum, affecting the quality of gypsum powder and thus affecting the quality of subsequent construction materials. Therefore, it is necessary to develop a production device for building gypsum powder.

[0050] In this embodiment, before calcining the desulfurized gypsum, the attached water on the outer surface of the desulfurized gypsum is removed by a hammer disperser 1, and after calcination, it is ground by a ball mill 3 and aged by an aging bin 5, so as to reduce the content of anhydrous gypsum in the plaster of paris, reduce the content of dihydrate gypsum in the plaster of paris, increase the content of hemihydrate gypsum in the plaster of paris, improve the quality stability of the building gypsum, improve the product quality, and provide a guarantee for the stability of raw materials for the stable production of the production line.

[0051] In order to improve the stability of the gypsum, the specific surface area of ​​the gypsum after grinding by ball mill 3 is 4200~4500cm 3 / g.

[0052] The calcined gypsum powder contains a certain amount of anhydrous gypsum and a small amount of unstable dihydrate gypsum. In order to promote uniform distribution of water during aging of gypsum, Figure 2 As shown, a first air chute 6 is provided between the cooler 4 and the aging bin 5, and the gypsum falls into the aging bin 5 through the first air chute 6. A discharge port 7 is provided at the bottom of the aging bin 5, and a second air chute 8 is provided at the bottom of the discharge port 7. A bucket elevator 9 is provided on one side of the aging bin 5, and the output end of the second air chute 8 is connected to the input end of the bucket elevator 9.

[0053] The output end of the bucket elevator 9 is connected to a three-way pipe 10, and a zipper machine 11 is provided between one of the outlets of the three-way pipe 10 and the inlet of the aging bin 5, so that the gypsum discharged from the aging bin 5 passes through the bucket elevator 9 and the zipper machine 11 in sequence and returns to the aging bin 5 again, thereby realizing multiple mixing of the gypsum.

[0054] By providing a bucket elevator 9 and a zipper machine 11, the gypsum in the aging bin 5 is discharged and returned to the aging bin 5 again, and the gypsum in the aging bin 5 is mixed multiple times, so that the moisture distribution inside the gypsum powder is more uniform, the internal stress is reduced, the circulation of water vapor is promoted, the accumulation of water vapor is prevented, and its stability and performance are improved.

[0055] Multiple mixing is beneficial to remove 3 / 2 of the structural water of dihydrate gypsum and convert it into hemihydrate gypsum.

[0056] By utilizing the return material mixing control method, the clinker is further homogenized and aged to increase the hemihydrate gypsum content and reduce the anhydrous gypsum and dihydrate gypsum contents.

[0057] In order to further improve the fluidity of plaster of Paris, Figure 3 As shown, a rotating shaft 12 is provided inside the aging bin 5, a motor 13 is connected to the top of the rotating shaft 12, a hollow main pipe 14 is connected to the bottom of the rotating shaft 12, and a hollow branch pipe 15 connected to the outer surface of the hollow main pipe 14 is connected to the hollow main pipe 14. When the output shaft of the motor 13 rotates, the hollow main pipe 14 and the hollow branch pipe 15 are driven to rotate through the rotating shaft 12, thereby stirring the gypsum powder inside the aging bin 5.

[0058] The top of the outer surface of the hollow main pipe 14 is rotatably connected with a box body 16, and the hollow main pipe 14 is connected to the box body 16;

[0059] An air pump 17 is provided on one side of the aging bin 5, the input end of the air pump 17 is connected to the aging bin 5, and the output end of the air pump 17 is connected to the box body 16;

[0060] The bottom of the hollow main pipe 14 and the hollow branch pipe 15 are both provided with openings 18, and the outer surfaces of the hollow main pipe 14 and the hollow branch pipe 15 are both provided with air holes 19;

[0061] The air pump 17 sucks the air inside the aging bin 5 and then discharges it to the box body 16 , and then the gas is ejected from the opening 18 and the air hole 19 , so that the gas inside the aging bin 5 can circulate.

[0062] The rotation of the rotating shaft 12 drives the hollow main pipe 14 and the hollow branch pipe 15 to rotate at the same time, thereby stirring the gypsum powder inside the aging bin 5. At the same time, the air pump 17 sucks the air inside the aging bin 5 and discharges it to the box body 16. Then the gas is ejected from the opening 18 and the air hole 19 to make the gas inside the aging bin 5 circulate. The hollow main pipe 14 and the hollow branch pipe 15 not only stir the cooked gypsum inside the aging bin 5, but the discharged gas can also promote the gas circulation inside the cooked gypsum and the dispersion of the cooked gypsum. During the aging process, by stirring and tumbling the materials, the water is evenly distributed, the gas circulation is better, and the aging is beneficial.

[0063] Due to the existence of the pores 19, the plaster of Paris can easily enter the hollow branch pipe 15 through the pores 19, thereby blocking the pores 19. In order to solve this problem, Figure 4 As shown, the inner wall of the hollow branch pipe 15 is fixedly connected with a cover body 20, the central axis of the cover body 20 coincides with the central axis of the hollow branch pipe 15, and the hollow branch pipe 15 is arranged to be inclined downward;

[0064] The top diameter of the cover body 20 is larger than the bottom diameter thereof.

[0065] Since the hollow branch pipe 15 is tilted downward, the gypsum entering the hollow branch pipe 15 will move downward under the action of gravity and centrifugal force, and thus be discharged from the inside of the hollow branch pipe 15. At the same time, due to the presence of the cover body 20, the gypsum powder is effectively prevented from continuing to move to the top of the hollow branch pipe 15.

[0066] When the cooked gypsum is recycled and mixed multiple times, in order to improve the uniformity of the gypsum powder mixing, a dispersion disk 21 is fixedly connected to the outer surface of the rotating shaft 12, and the dispersion disk 21 is higher than the end away from the rotating shaft 12 at one end of the dispersion disk 21. The gypsum powder falls from the top of the aging bin 5 onto the rotating dispersion disk 21, and then falls evenly into the interior of the aging bin 5.

[0067] The rotation of the rotating shaft 12 drives the dispersion plate 21 to rotate, so that the returned gypsum falls evenly into the aging bin 5. The stirring of the hollow branch pipe 15 further improves the mixing effect of the gypsum. At the same time, the dispersion plate 21 can also prevent the gypsum in the aging bin 5 from flying upward.

[0068] In combination with the above-mentioned production device for building gypsum powder, a production method for building gypsum powder is provided below, comprising the following steps:

[0069] The desulfurized gypsum is transported to the inside of the hammer-type disperser 1 to remove the water attached to the surface of the desulfurized gypsum;

[0070] Then, the desulfurized gypsum with the surface water removed is transported to the calcining furnace 2 for secondary calcination to remove 3 / 2 of the crystal water of the dihydrate gypsum in the desulfurized gypsum, so that the dihydrate gypsum is converted into hemihydrate gypsum to obtain gypsum.

[0071] The calcined plaster of Paris is conveyed to the ball mill 3 for grinding to reduce the particle size of the plaster of Paris;

[0072] The ground plaster of Paris is transported to the cooler 4 for cooling;

[0073] The cooled plaster of Paris is transported to the aging bin 5 for storage and aging to control the content of hemihydrate gypsum in the plaster of Paris.

[0074] When the plaster of Paris is aged, the plaster of Paris in the aging bin 5 is continuously output and then input into the aging bin 5, so as to achieve multiple mixing of the plaster of Paris.

[0075] In the method, before calcining the desulfurized gypsum, the attached water on the outer surface of the desulfurized gypsum is removed by a hammer-type disperser 1, and after calcination, the desulfurized gypsum is ground by a ball mill 3 and aged by an aging bin 5, so as to reduce the content of anhydrous gypsum in the plaster of paris, reduce the content of dihydrate gypsum in the plaster of paris, increase the content of hemihydrate gypsum in the plaster of paris, improve the quality stability of the building gypsum, improve the product quality, and provide a guarantee for the stability of raw materials for the stable production of the production line.

[0076] By utilizing the return material mixing control method, the clinker is further homogenized and aged to increase the hemihydrate gypsum content and reduce the anhydrous gypsum and dihydrate gypsum contents.

[0077] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A production device for building gypsum powder, characterized in that: include: A hammer-type dispersing machine (1) is used to remove water attached to the surface of desulfurized gypsum; A calcining furnace (2) performs two-step calcination on the desulfurized gypsum to remove 3 / 2 of the crystal water of the dihydrate gypsum in the desulfurized gypsum, so that the dihydrate gypsum is converted into hemihydrate gypsum to obtain gypsum; A ball mill (3) for grinding the calcined plaster of Paris; A cooler (4) for cooling the ground plaster of Paris; An aging bin (5) is used to store and age the cooled plaster of Paris to control the content of hemihydrate gypsum in the plaster of Paris; The hammer-type dispersing machine (1), the calcining furnace (2), the ball mill (3), the cooler (4) and the aging bin (5) are arranged in sequence, and the desulfurized gypsum passes through the hammer-type dispersing machine (1), the calcining furnace (2), the ball mill (3), the cooler (4) and the aging bin (5) in sequence through bucket lifting.

2. A production device for building gypsum powder according to claim 1, characterized in that: The specific surface area of ​​the gypsum after being ground by the ball mill (3) is 4200-4500cm 3 / g.

3. A production device for building gypsum powder according to claim 2, characterized in that: A first air chute (6) is provided between the cooler (4) and the aging bin (5), and the gypsum falls into the aging bin (5) through the first air chute (6). A discharge port (7) is provided at the bottom of the aging bin (5), and a second air chute (8) is provided at the bottom of the discharge port (7). A bucket elevator (9) is provided on one side of the aging bin (5), and the output end of the second air chute (8) is connected to the input end of the bucket elevator (9).

4. A production device for building gypsum powder according to claim 3, characterized in that: The output end of the bucket elevator (9) is connected to a three-way pipe (10), and a zipper machine (11) is provided between one of the outlets of the three-way pipe (10) and the inlet of the aging bin (5), so that the gypsum discharged from the aging bin (5) passes through the bucket elevator (9) and the zipper machine (11) in sequence and returns to the aging bin (5), thereby realizing multiple mixing of the gypsum.

5. A production device for building gypsum powder according to claim 4, characterized in that: A rotating shaft (12) is provided inside the aging bin (5), the top of the rotating shaft (12) is connected to a motor (13), the bottom of the rotating shaft (12) is connected to a hollow main pipe (14), and the outer surface of the hollow main pipe (14) is connected to a hollow branch pipe (15) which is in communication with the hollow main pipe (14). When the output shaft of the motor (13) rotates, the rotating shaft (12) drives the hollow main pipe (14) and the hollow branch pipe (15) to rotate, thereby stirring the gypsum powder inside the aging bin (5).

6. A production device for building gypsum powder according to claim 5, characterized in that: The top of the outer surface of the hollow main pipe (14) is rotatably connected to a box body (16), and the hollow main pipe (14) is in communication with the box body (16); An air pump (17) is provided on one side of the aging bin (5), an input end of the air pump (17) is connected to the aging bin (5), and an output end of the air pump (17) is connected to the box body (16); The bottoms of the hollow main pipe (14) and the hollow branch pipe (15) are both provided with openings (18), and the outer surfaces of the hollow main pipe (14) and the hollow branch pipe (15) are both provided with air holes (19); The air pump (17) sucks the air inside the aging bin (5) and then discharges it to the box body (16), and then the gas is ejected from the opening (18) and the air hole (19), so that the gas inside the aging bin (5) can circulate.

7. A production device for building gypsum powder according to claim 6, characterized in that: The inner wall of the hollow branch pipe (15) is fixedly connected with a cover body (20), the central axis of the cover body (20) coincides with the central axis of the hollow branch pipe (15), and the hollow branch pipe (15) is arranged to be inclined downward; The top diameter of the cover body (20) is greater than the bottom diameter thereof.

8. A production device for building gypsum powder according to claim 7, characterized in that: A dispersion disk (21) is fixedly connected to the outer surface of the rotating shaft (12); an end of the dispersion disk (21) close to the rotating shaft (12) is higher than an end thereof away from the rotating shaft (12); the gypsum powder falls from the top of the aging bin (5) onto the rotating dispersion disk (21) and then evenly falls into the interior of the aging bin (5).

9. A method for producing building gypsum powder, characterized in that: The production device of the building gypsum powder according to any one of claims 1 to 8 comprises the following steps: The desulfurized gypsum is transported to the inside of the hammer-type disperser (1) to remove the water attached to the surface of the desulfurized gypsum; Then, the desulfurized gypsum with the surface water removed is transported to a calcining furnace (2) for secondary calcination to remove 3 / 2 of the crystal water of the dihydrate gypsum in the desulfurized gypsum, so that the dihydrate gypsum is converted into hemihydrate gypsum to obtain gypsum; The calcined plaster of Paris is conveyed to the ball mill (3) for grinding to reduce the particle size of the plaster of Paris; The ground plaster of Paris is transported to a cooler (4) for cooling; The cooled plaster of Paris is transported to an aging bin (5) for storage and aging, and the content of hemihydrate gypsum in the plaster of Paris is controlled.

10. The method for producing building gypsum powder according to claim 9, characterized in that: When the plaster of Paris is aged, the plaster of Paris in the aging bin (5) is continuously output and then input into the aging bin (5) to achieve multiple mixing of the plaster of Paris.

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