Method for preparing marine restoration material block based on engineering soil

Abstract

The present application relates to the technical field of engineering slag, and discloses a preparation method of marine repair material blocks based on engineering slag, which comprises the following preparation steps: 1) forming the engineering slag into bulk material; 2) mixing the bulk material with cement and lime to form dry mixture; 3) forming the dry mixture on the conveying belt into wet mixture by water mist; 4) spraying liquid organic curing agent into the wet mixture in the longitudinal cylinder by the glue spray head during the falling process of the wet mixture from top to bottom in the longitudinal cylinder; 5) mixing the wet mixture to form preparation material; and 6) compacting the preparation material to form marine repair material blocks. The whole preparation process is simple, the hardness of the formed marine repair material blocks is high, and the engineering slag is reused, so that the environmental protection demand of resource reuse is realized.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of engineering slag soil, in particular to a preparation method of marine repair material blocks based on engineering slag soil. BACKGROUND

[0002] Engineering slag soil refers to discarded soil generated due to excavation of earthwork in various construction processes. At present, in addition to a small amount of resourceization and productization (such as firing of ceramic particles, sintering of bricks and free-burning pressure molding of bricks), most of the engineering slag soil is transported, filled and washed.

[0003] The engineering slag soil often contains a certain amount of sand and stone, which can be extracted as a renewable building material after water washing. However, the sand and stone content of the engineering slag soil varies with regions and soil layer positions.

[0004] In the prior art, the engineering slag soil can be prepared into marine repair material blocks, which can be used as coastal slope protection materials, artificial reef materials and coastal ecological soil. However, the whole preparation process is too complicated, and the hardening degree of the formed marine repair material blocks is low. SUMMARY

[0005] The application aims to provide a preparation method of marine repair material blocks based on engineering slag soil, and aims to solve the problem of complicated preparation process in the prior art.

[0006] The application is implemented as follows: the preparation method of marine repair material blocks based on engineering slag soil comprises the following preparation steps:

[0007] 1. The engineering slag soil is placed in a pulverizer for scattering to form a bulk material;

[0008] 2. The bulk material is mixed with cement and lime to form a dry mixture;

[0009] 3. The dry mixture is placed on a conveying belt in a spread state, a water spray head is arranged on the conveying belt, the water spray head sprays water mist towards the dry mixture on the conveying belt, and the water mist forms a wet mixture on the conveying belt;

[0010] 4. The wet mixture on the conveying belt falls into a stirrer through a longitudinal cylinder, a glue spray head is arranged in the longitudinal cylinder, and the glue spray head sprays liquid organic curing agent towards the wet mixture in the longitudinal cylinder during the falling process of the wet mixture in the longitudinal cylinder from top to bottom;

[0011] 5. The wet mixture mixed with the organic curing agent falls into the stirrer for stirring and mixing to form a preparation material;

[0012] 6), the preparation device is placed in the mold to compact and form a block, and the block is hardened to form a marine repair material block after standing for a set time.

[0013] Further, the pulverizer has a pulverizing cavity, the bottom of the pulverizing cavity has a rotating disc arranged to rotate, the rotating disc is connected with a rotating shaft, the rotating shaft drives the rotating disc to rotate circumferentially, and the rotating shaft penetrates the pulverizing cavity; the rotating disc is provided with a plurality of inclined ribs arranged to incline, the inclined ribs are provided with a pulverizing channel, the lower end of the pulverizing channel penetrates the bottom of the rotating disc, and the upper end of the pulverizing channel is formed with a chip opening.

[0014] In the preparation step 1), the engineering slag is placed in the pulverizing cavity, the rotating shaft drives the rotating disc to rotate, the rotating disc is arranged to rotate in a staggered manner with the engineering slag, the chip opening of the inclined rib chips the engineering slag, and the engineering slag is chipped and pulverized and discharged through the pulverizing channel.

[0015] Further, the rotating disc is provided with a plurality of the inclined ribs, the plurality of the inclined ribs are arranged to surround the outer periphery of the rotating shaft at intervals, and the orientations of the chip openings of the adjacent inclined ribs are different.

[0016] Further, the rotating disc is arranged to incline, and in the preparation step 1), the inclined rotating disc synchronously drives the engineering slag to agitate up and down during the rotation of the rotating disc.

[0017] Further, the pulverizing channel is provided with a plurality of cutting pieces, the outer end of the cutting piece is butt-jointed to the inner side wall of the pulverizing channel, the inner end of the cutting piece is arranged towards the middle part of the pulverizing channel to form a soil cutting edge, and the plurality of the cutting pieces are arranged to surround the periphery of the pulverizing channel at intervals; in the preparation step 1), the engineering slag entering the pulverizing channel through the chip opening is chipped and pulverized by the plurality of the cutting pieces after being extruded and flowing along the pulverizing channel.

[0018] Further, the upper part of the longitudinal cylinder is provided with two oppositely inclined inclined plates, the upper end of the inclined plate is connected to the top of the longitudinal cylinder, and the lower end of the two inclined plates forms a strip-shaped material falling interval; along the direction from top to bottom of the inclined plate, the inclined plates are oppositely arranged to incline, and the material falling interval is provided with a screen.

[0019] The lower part of the longitudinal strip has a glue spraying cavity, and the glue spraying head is arranged in the glue spraying cavity; in the preparation step 4), the wet mixture falls into the feeding space, moves downward along the inclined plate, and after passing through the screen, falls into the glue spraying cavity in a dispersed manner; in the process of falling of the wet mixture into the glue spraying cavity, the glue spraying head sprays the liquid organic curing agent toward the falling wet mixture, so that the organic curing agent is mixed with the wet mixture.

[0020] Further, in the preparation step 4), after the wet mixture falls into the feeding space, the screen reciprocally rubs along the moving direction, and the moving direction is arranged obliquely to the length direction of the feeding interval; in the process of passing through the feeding interval, the wet mixture moves out of phase with the moving screen, so that the wet mixture dynamically passes through the screen.

[0021] Further, a plurality of glue spraying heads are arranged in the glue spraying cavity, the plurality of glue spraying heads are arranged in a spaced manner along the circumferential direction of the glue spraying cavity, and are arranged below the feeding interval; the glue spraying head is arranged obliquely upward toward the feeding interval, and the inclination angles of the plurality of glue spraying heads are different.

[0022] In the preparation step 4), in the process of falling of the wet mixture through the screen into the glue spraying cavity, the plurality of glue spraying heads sprays the organic curing agent obliquely upward, and the organic curing agent is mixed with the wet mixture.

[0023] Further, in the preparation step 5), before the wet mixture mixed with the organic curing agent falls into the stirrer, the stirrer is in a rotating stirring state; in the process of falling of the wet mixture mixed with the organic curing agent into the stirrer, the stirrer continuously rotates and stirs the wet mixture, until the preparation material is obtained, and then the stirrer reversely rotates for a set time, and then the preparation material is discharged from the stirrer.

[0024] Further, a plurality of protrusions are arranged on the conveying belt, the bottom of the protrusion is connected to the conveying belt, the top of the protrusion extends upward, and along the direction from the bottom to the top of the protrusion, the protrusion is arranged in a tapered shape; in the preparation step 3), the dry mixture is arranged on the conveying belt in a flat manner, the top of the protrusion extends above the dry mixture, and the plurality of protrusions divide the dry mixture into a plurality of regions, so that the water mist sprayed by the water spraying head is uniformly mixed with the dry mixture.

[0025] Compared with the prior art, the preparation method of the marine repair material block based on engineering slag provided by the application can crush the engineering slag into a scattered material, facilitate mixing of the engineering slag with cement and lime to form a dry mixture, realize uniform spraying of water mist to form a wet mixture during transmission of the dry mixture on a transmission belt, realize uniform mixing of the wet mixture and the organic curing agent by spraying the organic curing agent in a liquid state during free falling of the wet mixture into a stirrer in a longitudinal cylinder, continue to stir and mix the wet mixture mixed with the organic curing agent in the stirrer to form a preparation material, and use the preparation material to prepare the marine repair material block, so that the preparation process is simple, the hardness of the marine repair material block is high, and the engineering slag is reused to meet the environmental protection demand of resource reuse. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a flowchart of the preparation method of the marine repair material block based on engineering slag provided by the application;

[0027] Figure 2 is a cross-sectional view of a rotating disc provided by the application;

[0028] Figure 3 is a front view of a transmission belt provided by the application;

[0029] Figure 4 is an internal view of a crushing channel provided by the application;

[0030] Figure 5 is an internal view of a longitudinal cylinder provided by the application. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the application clearer, the application is further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the application and do not limit the application.

[0032] The implementation of the application is described in detail below with reference to specific examples.

[0033] In the drawings of the present embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that the orientations or positional relationships indicated by terms such as "upper", "lower", "left", "right", etc. are based on the orientations or positional relationships shown in the drawings, and are only used to facilitate the description of the application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for illustrative purposes, and cannot be understood as a limitation on the present patent, and for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0034] Referring to Figures 1-5 the preferred embodiments provided by the present application.

[0035] The preparation method of the marine repair material block based on engineering slag soil comprises the following preparation steps:

[0036] 1) The engineering slag soil is placed in a pulverizer for scattering to form a bulk material;

[0037] 2) The bulk material is mixed with cement and lime to form a dry mixture 600;

[0038] 3) The dry mixture 600 is placed on a conveying belt 500 in a spread state, and a water spray head is arranged on the conveying belt 500, which sprays water mist towards the dry mixture 600 on the conveying belt 500, and the water mist forms a wet mixture on the dry mixture 600 on the conveying belt 500;

[0039] 4) The wet mixture on the conveying belt 500 falls freely into a stirrer through a longitudinal cylinder 200, and a glue spraying head 400 is arranged in the longitudinal cylinder 200; during the falling process of the wet mixture in the longitudinal cylinder 200 from top to bottom, the glue spraying head 400 sprays liquid organic curing agent to the wet mixture in the longitudinal cylinder 200;

[0040] 5) The wet mixture mixed with the organic curing agent falls into the stirrer for stirring and mixing to form a preparation material;

[0041] 6) The preparation material is placed in a mold for compaction to form a block, and the block is hardened to form a marine repair material block after being placed for a set time.

[0042] The preparation method of the marine repair material block based on engineering slag soil provided above pulverizes the engineering slag soil into a bulk material, which is convenient for mixing with cement and lime to form a dry mixture 600; the dry mixture 600 can be uniformly sprayed with water mist to form a wet mixture during the conveying process on the conveying belt 500; the liquid organic curing agent is sprayed to the wet mixture during the free falling process of the wet mixture in the longitudinal cylinder 200 into the stirrer, which can uniformly mix the wet mixture and the organic curing agent; the wet mixture mixed with the organic curing agent is continuously stirred and mixed in the stirrer to form a preparation material, and the marine repair material block is prepared using the preparation material; the whole preparation process is simple, the hardness of the marine repair material block formed is high, and the engineering slag soil is reused to meet the environmental protection demand of resource reuse.

[0043] The marine repair material block can be used for marine environment repair, including filling repair of sand pits, coastal slope protection materials, artificial reef materials, and coastal ecological soil, etc.

[0044] In the embodiment, the cement and lime are inorganic solidifying agents, which are in powder form, and can be mixed with the bulk material, and hardened after chemical reaction, to achieve the effect of solidification, such as Portland cement, sulphoaluminate cement, magnesium oxide cement, magnesium oxychloride cement, alkali-activated cement, and geopolymer materials, etc.

[0045] The organic solidifying agent herein can be an organic cementing material such as asphalt, natural or synthetic resin, etc., which is mixed in the wet mixture, and can be mixed with the wet mixture by stirring, to bond the wet mixture into a whole, and to harden the prepared material by physical and chemical effects, to achieve the effect of solidification.

[0046] In the embodiment, the mixing of the inorganic solidifying agent and the organic solidifying agent can make the prepared material more integrated, and the subsequent hardening and solidification effect is better.

[0047] In the embodiment, the pulverizer has a pulverizing cavity, the bottom of the pulverizing cavity is provided with a rotating disc 100 arranged to rotate, the rotating disc 100 is connected with a rotating shaft, the rotating shaft drives the rotating disc 100 to rotate circumferentially, and the rotating shaft penetrates the pulverizing cavity; the rotating disc 100 is provided with a plurality of inclined ribs 101, the inclined ribs 101 are provided with a pulverizing channel 102, the lower end of the pulverizing channel 102 penetrates the bottom of the rotating disc 100, and the upper end of the pulverizing channel 102 is formed with a chip opening 103.

[0048] In the preparation step 1), the construction waste is placed in the pulverizing cavity, the rotating shaft drives the rotating disc 100 to rotate, the rotating disc 100 is arranged to rotate in a staggered manner with the construction waste, the chip opening 103 of the inclined rib 101 chips the construction waste, and the construction waste is chipped and pulverized and then discharged through the pulverizing channel 102.

[0049] The construction waste is placed in the pulverizing cavity, and the construction waste is basically in a block state rather than a dispersed state; the rotating disc 100 rotates, the plurality of chip openings 103 chip and refine the construction waste, which is equivalent to the effect of pulverization, so that the construction waste forms a bulk material.

[0050] In the process of rotating the rotating disc 100, the rotating disc 100 not only chips the construction waste, but also synchronously drives the construction waste to rotate, and drives the construction waste to collide with each other in the process of rotating, so that the construction waste is broken before being chipped, and then further chipped through the chip opening 103, to achieve the effect of pulverization.

[0051] In the embodiment, the rotating disc 100 is provided with a plurality of inclined ribs 101, the plurality of inclined ribs 101 are arranged in a spaced manner along the outer periphery of the rotating shaft, and the orientations of the chip openings 103 of the adjacent inclined ribs 101 are different. In this way, the plurality of chip openings 103 can chip the construction waste in multiple directions, to achieve wide-range chipping and pulverization, and greatly improve the pulverization effect.

[0052] The rotating disc 100 is arranged in an inclined manner, in the preparation step 1), during the rotation of the rotating disc 100, the inclined rotating disc 100 synchronously drives the engineering sludge to stir up and down, so that the rotating disc 100 realizes the up and down stirring of the engineering slurry during the cutting of the engineering slurry, avoids the adhesion of the engineering slurry on the rotating disc 100, and can preliminarily crush the engineering slurry in the stirring process.

[0053] In the embodiment, a plurality of cutting pieces 104 are arranged in the crushing channel 102, the outer end of the cutting piece 104 is butt-jointed on the inner side wall of the crushing channel 102, the inner end of the cutting piece 104 is arranged towards the middle part of the crushing channel 102, forming a cutting soil edge; a plurality of cutting pieces 104 are arranged along the circumference of the crushing channel 102; in the preparation step 1), the engineering slurry entering the crushing channel 102 through the cutting opening 103 is crushed by the plurality of cutting pieces 104 after being extruded.

[0054] The engineering slurry cut by the cutting opening 103 is further crushed by the plurality of cutting pieces 104 during the extrusion movement along the crushing channel 102, so that the bulk material coming out of the crushing channel 102 is more dispersed.

[0055] In the embodiment, the upper part of the longitudinal cylinder 200 is provided with two oppositely inclined inclined plates 300, the upper end of the inclined plate 300 is connected to the top of the longitudinal cylinder 200, and the lower end of the two inclined plates 300 forms a strip-shaped material falling interval; along the direction from top to bottom of the inclined plate 300, the inclined plate 300 is oppositely inclined, and the material falling interval is provided with a screen 301.

[0056] The lower part of the longitudinal strip has a glue spraying cavity 202, and the glue spraying head 400 is arranged in the glue spraying cavity 202; in the preparation step 4), the wet mixture falls into the material falling interval, and moves downward along the inclined plate 300, and falls into the glue spraying cavity 202 in a dispersed state after passing through the screen 301; during the falling of the wet mixture into the glue spraying cavity 202, the glue spraying head 400 sprays liquid organic curing agent towards the falling wet mixture, so as to mix the organic curing agent with the wet mixture.

[0057] By arranging two inclined parts, the wet mixture in the material falling interval can be guided to flow towards the material falling interval, and the wet mixture can be dispersed and fallen through the filter of the screen 301 and falls into the glue spraying cavity 202, and the glue spraying head 400 sprays the organic curing agent to mix with the dispersed wet mixture, so that the mixture is more uniform, and the local agglomeration phenomenon in the mixing process is avoided.

[0058] In the preparation step 4), when the wet mixture falls into the feeding space 201, the screen 301 reciprocally rubs along the moving direction which is obliquely arranged with the length direction of the feeding interval, and the wet mixture moves with the screen 301 in the moving direction to make the wet mixture dynamically pass through the screen 301.

[0059] The screen 301 reciprocally moves with the feeding interval in the oblique direction to synchronously drive the wet mixture in the feeding interval to efficiently pass through the screen 301, avoid the screen 301 from being blocked, and further shred and crush the wet mixture.

[0060] In the embodiment, the glue spraying cavity 202 is provided with a plurality of glue spraying heads 400 which are arranged in the circumferential direction of the glue spraying cavity 202 and below the feeding interval.

[0061] In the preparation step 4), when the wet mixture falls into the glue spraying cavity 202, the plurality of glue spraying heads 400 obliquely spray the organic curing agent upward to mix the organic curing agent with the wet mixture.

[0062] The glue spraying heads 400 are obliquely arranged upward to buffer the falling wet mixture upward to make the wet mixture more uniformly mixed with the organic curing agent, and the plurality of glue spraying heads 400 are obliquely arranged in different directions to buffer and mix the falling wet mixture in multiple directions and a wide range.

[0063] In the embodiment, in the preparation step 5), the mixer is in the rotating and mixing state before the wet mixture mixed with the organic curing agent falls into the mixer, so that the wet mixture mixed with the organic curing agent is in the mixing state during the whole falling process into the mixer to be more uniformly mixed.

[0064] In the falling process of the wet mixture mixed with the organic curing agent into the mixer, the mixer continuously rotates and mixes the wet mixture until the preparation material is prepared, the mixer reversely rotates for a set time, and then the preparation material is discharged from the mixer.

[0065] The mixer is in the mixing state before the preparation material is formed, during the formation of the preparation material, and after the preparation material is formed, so that the preparation material is more uniformly mixed.

[0066] The transmission belt 500 is provided with a plurality of protrusions 501, the bottom of the protrusion 501 is butted on the transmission belt 500, the top of the protrusion 501 extends upwards, along the direction from bottom to top of the protrusion 501, the protrusion 501 is arranged in a conical shape; in the preparation step 3), the dry mixture 600 is arranged in a flat shape on the transmission belt 500, the top of the protrusion 501 extends above the dry mixture 600, the plurality of protrusions 501 divides the dry mixture 600 into a plurality of regions, so that the water mist sprayed by the water spray head is uniformly mixed with the dry mixture 600.

[0067] The protrusion 501 is in a conical shape, so that in the process of spraying water mist, the water mist is also convenient to penetrate into the dry mixture 600 through the protrusion 501, and the protrusion 501 can regionalize the dry mixture 600, so that it is more uniform to mix with the water mist.

[0068] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a marine restoration material block based on engineered soil, characterized by, The preparation method comprises the following steps: 1) placing the engineering sludge in a pulverizer to scatter, forming a scattered material; 2) mixing the scattered material with cement and lime to form a dry mixture; 3) placing the dry mixture on a conveying belt in a spread state, the conveying belt being provided with a water nozzle, the water nozzle spraying water mist towards the dry mixture on the conveying belt, the water mist forming the dry mixture on the conveying belt into a wet mixture; 4) the wet mixture on the conveying belt falling freely into a stirrer through a longitudinal cylinder, the longitudinal cylinder being provided with a glue spraying head; during the falling process of the wet mixture in the longitudinal cylinder from top to bottom, the glue spraying head sprays liquid organic curing agent towards the wet mixture in the longitudinal cylinder; 5) the wet mixture mixed with the organic curing agent falling into the stirrer to be stirred and mixed, forming a preparation material; 6) placing the preparation material in a mold to be compacted, forming a block, the block being placed for a set time to harden into a marine repair material block; The pulverizer has a pulverizing cavity, the bottom of the pulverizing cavity being provided with a rotating disc arranged to rotate, the rotating disc being connected with a rotating shaft, the rotating shaft driving the rotating disc to rotate circumferentially, the rotating shaft penetrating the pulverizing cavity; the rotating disc is provided with a plurality of inclined ribs arranged to incline, the inclined ribs being provided with pulverizing channels, the lower ends of the pulverizing channels penetrating the bottom of the rotating disc, the upper ends of the pulverizing channels being formed with chip openings; the rotating disc is provided with a plurality of the inclined ribs, the plurality of the inclined ribs being arranged to surround at intervals along the outer periphery of the rotating shaft, and the orientations of the chip openings of adjacent inclined ribs being different; the rotating disc is arranged to incline; the pulverizing channels are provided with a plurality of cutting pieces, the outer ends of the cutting pieces being connected to the inner side walls of the pulverizing channels, the inner ends of the cutting pieces being arranged towards the middle parts of the pulverizing channels to form soil cutting edges; the plurality of the cutting pieces are arranged to surround at intervals along the circumferences of the pulverizing channels. The step 1) of the preparation method is specifically as follows: placing the engineering sludge in the pulverizing cavity, the rotating shaft driving the rotating disc to rotate, the rotating disc being arranged to rotate in a staggered manner with the engineering sludge, the chip openings of the inclined ribs cutting the engineering sludge, and the engineering sludge being cut and pulverized to be discharged through the pulverizing channels; during the rotating process of the rotating disc, the inclined rotating disc synchronously drives the engineering sludge to agitate up and down; the engineering sludge entering the pulverizing channels through the chip openings is extruded to flow along the pulverizing channels and is cut and pulverized by the plurality of the cutting pieces.

2. The method of claim 1, wherein the method further comprises the step of: The upper part of the longitudinal cylinder is provided with two inclined plates arranged to incline towards each other, the upper ends of the inclined plates being connected to the top of the longitudinal cylinder, the lower ends of the two inclined plates forming a strip-shaped material falling interval; along the direction of the inclined plates from top to bottom, the inclined plates are arranged to incline towards each other, the material falling interval being provided with a screen. ​ The lower part of the longitudinal cylinder has a glue spraying cavity, and a glue spraying head is arranged in the glue spraying cavity; in the preparation step 4), the wet mixture falls into the feeding space and moves downward along the inclined plate, and after passing through the screen, the wet mixture falls into the glue spraying cavity in a dispersed manner; during the falling of the wet mixture into the glue spraying cavity, the glue spraying head sprays the liquid organic curing agent toward the falling wet mixture to mix the organic curing agent with the wet mixture.

3. The method for preparing marine remediation material blocks based on engineering waste as described in claim 2, characterized in that, In the preparation step 4), after the wet mixture falls into the feeding space, the screen reciprocally rubs along the moving direction, the moving direction is arranged obliquely to the length direction of the feeding interval, and during the passing of the wet mixture through the feeding interval, the wet mixture moves out of phase with the moving screen to dynamically pass through the screen.

4. The method of claim 2, wherein the method further comprises the step of: A plurality of glue spraying heads are arranged in the glue spraying cavity, the plurality of glue spraying heads are arranged in a spaced manner along the circumference of the glue spraying cavity and are located below the feeding interval; the glue spraying head is arranged obliquely upward toward the feeding interval, and the inclination angles of the plurality of glue spraying heads are different. ​ In the preparation step 4), during the falling of the wet mixture through the screen into the glue spraying cavity, the plurality of glue spraying heads sprays the organic curing agent obliquely upward, and the organic curing agent is mixed with the wet mixture.

5. The method for preparing marine remediation material blocks based on engineering waste as described in claim 1, characterized in that, In the preparation step 5), before the wet mixture mixed with the organic curing agent falls into the stirrer, the stirrer is in a rotating stirring state; during the falling of the wet mixture mixed with the organic curing agent into the stirrer, the stirrer continuously rotates and stirs the wet mixture, and after the preparation material is obtained, the stirrer reversely rotates for a set time, and then the preparation material is discharged from the stirrer.

6. The method for preparing marine remediation material blocks based on engineering waste as described in claim 1, characterized in that, A plurality of protrusions are arranged on the conveying belt, the bottom of the protrusion is connected to the conveying belt, the top of the protrusion extends upward, and the protrusion is arranged in a tapered shape along the direction from the bottom to the top of the protrusion; in the preparation step 3), the dry mixture is arranged in a flat manner on the conveying belt, the top of the protrusion extends above the dry mixture, and the plurality of protrusions divide the dry mixture into a plurality of regions to uniformly mix the water mist sprayed by the water spraying head with the dry mixture.

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