Granulation forming preparation method and granulation device of engineering residue soil water permeable brick

Abstract

The invention discloses a granulation forming preparation method and a granulation device of an engineering residue soil water permeable brick, the water permeable brick is obtained through raw material preparation, mixing and stirring, homogenization, granulation, static pressure forming, drying and roasting, and the raw materials comprise engineering residue soil, coal gangue, waste porcelain powder, an adhesive and a swelling aid; the granulating device comprises an extrusion assembly and a matched granulating screen, screen holes are equilateral triangles, a cutting assembly is arranged at the lower end of an extrusion opening of the extrusion assembly, and the cutting assembly comprises a base plate and a rotating blade installed on the base plate through a rotating shaft. The water permeable brick is prepared by taking the engineering residue soil as a main raw material, adding the coal gangue and the waste porcelain powder as auxiliary raw materials and adopting a method of firstly granulating and then forming, particles with uniform particle size and strength are obtained through granulating, a stable structure can be established after static pressure forming of gradient pressurization, and a communication channel is formed; the water permeable brick is suitable for the fields of road engineering, building materials and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of building materials, and particularly relates to a granulation and forming preparation method and a granulation device for engineering muck permeable bricks. Background Art

[0002] With the acceleration of the urbanization process, various construction projects have increased significantly, and a large amount of construction waste is generated during engineering activities. How to achieve efficient resource utilization of muck is a difficult point and pain point faced by construction projects. As an important part of construction waste, engineering muck mainly includes waste soil, stone materials, concrete fragments, metal and non-metal muck, etc., and the annual output of engineering muck is more than billions of cubic meters. At present, the main treatment methods for engineering muck are as follows: (1) Stacking treatment; by stacking engineering muck in a specially designated landfill for isolation treatment to reduce pollution to groundwater, soil and air. However, this method occupies land resources and may have the problem of small subsequent resource recovery space; (2) Backfilling in stockpiles; filling engineering muck into newly excavated or abandoned foundation pits, road filling, mountain slope cutting and other projects. This method can solve the stacking problem of muck to a certain extent, but it is prone to the risk of secondary geological disasters; (3) Resource utilization; including dam filling, use of backfill soil, garbage landfill, building material production, etc. Such technologies are beneficial to reducing resource waste and cost, but generally have problems such as high technical thresholds, low treatment efficiency, and unstable market demand. How to effectively and environmentally dispose of engineering muck, reduce its impact on the environment, and promote the recycling of resources has become an important topic for urban sustainable development. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a granulation and forming preparation method for engineering muck permeable bricks in view of the deficiencies of the above-mentioned prior art. This method uses engineering muck as the main raw material, and at the same time adds coal gangue and waste porcelain powder as auxiliary raw materials, and adopts the method of granulating first and then forming to prepare permeable bricks. By granulation, particles with uniform particle size and strength are obtained. After static pressure forming, a stable structure can be established, and connected channels are formed, which improves the strength of the permeable brick while increasing its water permeability. At the same time, it effectively disposes of solid waste including engineering muck and solves the problem of the treatment and transformation of existing engineering muck.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A granulation and molding preparation method for engineering muck permeable bricks, characterized in that the method sequentially includes raw material preparation, mixing and stirring, homogenization, granulation, static pressure molding, drying, and roasting to obtain permeable bricks; the raw materials include engineering muck, coal gangue, waste porcelain powder, binder, and swelling agent; the engineering muck permeable bricks include the following components in parts by mass based on dry basis: 60 parts to 80 parts of engineering muck, 0 parts to 40 parts of coal gangue, 0 parts to 20 parts of waste porcelain powder, the binder is one or more of feldspar, bentonite, and calcium sulfate, and the mass of the binder is 5% to 10% of the total mass of engineering muck, coal gangue, and waste porcelain powder, the swelling agent is one or more of silicon carbide, water glass, wood chips, and dolomite powder, and the mass of the swelling agent is 1% to 2% of the total mass of engineering muck, coal gangue, and waste porcelain powder.

[0005] The above-mentioned granulation and molding preparation method for engineering muck permeable bricks is characterized in that the engineering muck permeable bricks include the following components in parts by mass based on dry basis: 60 parts of engineering muck, 30 parts of coal gangue, 10 parts of waste porcelain powder, the binder is bentonite, and the mass of the binder is 5% of the total mass of engineering muck, coal gangue, and waste porcelain powder, the swelling agent is water glass, and the mass of the swelling agent is 2% of the total mass of engineering muck, coal gangue, and waste porcelain powder.

[0006] The above-mentioned granulation and molding preparation method for engineering muck permeable bricks is characterized in that the obtained granules are triangular prism granules. The angular structure of the triangular prism is easy to form regular pores during stacking, the permeable path is more stable, the porosity controllability is relatively high, compared with spherical granules, the pore regularity is better, and the angular edges of the prism can reduce the retention of fine particles (such as sediment) in the pores, reducing the blockage risk during long-term use; in addition, the angular structure of the triangular prism will enhance the mechanical interlocking effect between particles, with higher compressive strength, larger plane contact area, and more uniform pressure distribution, making the overall strength of the brick body better than that of spherical and ordinary columnar granules, and reducing the dosage of the binder.

[0007] At the same time, the present invention also discloses a granulation device for the above-mentioned granulation and molding preparation method of engineering muck permeable bricks, characterized in that it includes an extrusion assembly and a granulation screen mesh arranged at the extrusion outlet of the extrusion assembly, and the screen holes in the granulation screen mesh are equilateral triangles. A cutting assembly is arranged at the lower end of the extrusion outlet of the extrusion assembly. The cutting assembly includes a chassis and a rotary blade installed on the chassis through a rotating shaft, and the rotating shaft is opposite to the center of the extrusion outlet of the extrusion assembly.

[0008] The above granulating device is characterized in that the side length of the granulating screen is 100 mm to 140 mm, the side length of the equilateral triangle of the sieve holes is 2 mm to 4 mm, the thickness of the rotating blade is 1 mm to 2 mm, the length is 50 mm to 70 mm, and the rotation speed of the rotating shaft is 100 r / min to 150 r / min. By defining the dimensions of the key structures in the granulating device, it is ensured that the channels formed after the prepared particles are formed by static pressure molding meet the water permeability requirements of conventional permeable bricks, which is conducive to the drainage of water, thereby improving the water permeability of the permeable bricks.

[0009] In addition, the present invention also discloses a method for preparing engineering soil and rock permeable bricks by using the above granulating device, which is characterized in that the method includes the following steps:

[0010] Step 1: Screen the engineering soil and rock and coal gangue to remove impurities, and dry them to a constant weight at 100 °C ± 5 °C;

[0011] Step 2: Place the dried engineering soil and rock in Step 1 into a ball mill for grinding to a particle size of less than 0.15 mm; first place the dried coal gangue in Step 1 into a jaw crusher for crushing to a particle size of less than 0.5 mm, and then place it into a ball mill for grinding to a particle size of less than 0.15 mm;

[0012] Step 3: According to the designed composition of the target product permeable brick, add the engineering soil and rock with a particle size of less than 0.15 mm, coal gangue with a particle size of less than 0.15 mm, waste porcelain powder, binder, and swelling agent in Step 2 into a mixer, and perform dry mixing and slow stirring at a rotation speed of 60 r / min for 5 min to 6 min until fully mixed. Then, spray water on the mixed dry materials in the mixer and perform mixing and stirring at 120 r / min for 5 min to 6 min to obtain a uniformly mixed wet material; the added mass of water is 10% to 15% of the mass of the mixed dry materials;

[0013] Step 4: Seal and homogenize the wet material obtained in Step 3 for 48 h to obtain a homogenized material;

[0014] Step 5: Feed the homogenized material obtained in Step 4 into the granulating device for extrusion granulation to obtain triangular prism particles; the bottom edge length of the triangular prism particles is 2 mm to 4 mm, and the edge height is 2 mm to 4 mm;

[0015] Step 6: Uniformly place the triangular prism particles obtained in Step 5 into a brick-making mold for static pressure molding to obtain a brick blank; the static pressure molding is carried out in a gradient pressure application manner, first applying a pressure of 1 MPa for pre-pressing, positioning, and pressure maintaining for 10 s, and then applying a pressure of 5 MPa to 10 MPa for final pressing. The thickness of the brick blank is 20 mm to 25 mm;

[0016] Step 7: Feed the green bricks obtained in Step 6 into a drying kiln for drying and curing, then feed them into a kiln for roasting, naturally cool them to room temperature and take them out to obtain permeable bricks made of construction waste soil; the drying temperature for drying and curing is 100°C ± 5°C, and the moisture content of the green bricks after drying and curing is lower than 3%; the roasting system of the kiln is as follows: first heat at a heating rate of 2°C / min to 200°C, then heat at a heating rate of 4°C / min to 900°C and hold for 30 min, and continue to heat at a heating rate of 4°C / min to the firing temperature of 1100°C - 1200°C and hold for 120 min - 150 min.

[0017] In Step 3 of the present invention, by controlling the added mass of water in the mixed dry materials, it is avoided that the homogenized materials entering the granulation device subsequently are too viscous to be extruded conveniently, ensuring that the extruded particles have a certain strength, so as to form a stable spatial structure between the particles after static pressure forming and play a skeleton role in the green bricks.

[0018] In Step 5 of the present invention, the edge length: edge height of the triangular prism particles is controlled to be 1:1.5 - 2.0, avoiding that the triangular prism particles are too short and the contact area of their edges and corners is small, which is easy to slide during pressing and results in insufficient bite force between the particles, significantly reducing the compressive strength of the permeable bricks. At the same time, avoiding that the triangular prism particles are too long, the particles are easy to break during pressing and the grading structure is damaged, resulting in the formation of weak areas inside the whole permeable bricks.

[0019] In Step 6 of the present invention, the static pressure forming adopts a gradient pressurization method. First, apply a pressure of 1 MPa for pre-pressing, positioning and pressure maintaining for 10 s, and then apply a pressure of 5 MPa - 10 MPa for final pressing, so as to directionally retain the large-size connected pores between the edges and corners, improve the permeability coefficient of the permeable bricks, and at the same time avoid cracks generated inside the brick body due to rapid compression.

[0020] The above method is characterized in that the process of extrusion granulation in Step 5 is as follows: put the homogenized materials into the extrusion die of the extrusion assembly and fill it, then extrude the homogenized materials through the granulation screen mesh from the extrusion die, and use a rotary blade to cut along the extrusion port to obtain triangular prism particles.

[0021] The present invention has the following advantages compared with the prior art:

[0022] 1. The present invention uses construction waste soil as the main raw material, and at the same time adds coal gangue and waste porcelain powder as auxiliary raw materials to prepare permeable bricks. After mixing and homogenizing the raw materials and granulating, using the characteristics of the triangular prism shape and uniform particle size of the prepared particles, a stable structure can be established after static pressure forming, and regular pores are formed, improving the strength of the permeable bricks and at the same time improving their water permeability; at the same time, both the main material and the auxiliary material used in the present invention are solid waste raw materials, effectively disposing of solid waste including construction waste soil, increasing the admixture of construction waste soil in the raw materials, realizing the high utilization rate of construction waste soil, and greatly reducing the preparation cost.

[0023] 2. Instead of increasing the water permeability rate of the permeable brick by using the raw material particle gradation as a skeleton, the present invention prepares the permeable brick by a method of granulating first and then forming. Since the raw materials form particles with a certain uniform particle size and strength after granulation, the green body obtained by static pressure forming with gradient pressing is regular and orderly, improving the wear resistance of the permeable brick. At the same time, the particles act as a skeleton to form uniformly distributed external pores, increasing the water permeability rate of the permeable brick, so that the permeable brick is widely used in fields such as highway engineering and building materials.

[0024] 3. In the present invention, by adding a binder, the particles in each material are promoted to be closely packed, and the materials fully react with each other during the high-temperature roasting process. At the same time, under the action of the swelling agent, pores that communicate with each other inside are formed, improving the water absorption rate of the permeable brick without affecting its strength.

[0025] 4. The present invention uses construction waste soil to prepare permeable bricks, improving the technical efficiency of converting construction waste soil into useful resources, realizing the recycling of solid waste, eliminating or reducing the impact on the environment during the disposal of construction waste soil, achieving green and clean production, and conforming to the concept of "sponge city", alleviating the problem of poor water permeability in the city and improving the urban ecological system.

[0026] The technical solution of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of the granulating device for the construction waste soil permeable brick of the present invention.

[0028] Figure 2 It is a top view of the extrusion assembly in the granulating device for the construction waste soil permeable brick of the present invention.

[0029] Figure 3 It is a schematic structural diagram of the cutting assembly in the granulating device for the construction waste soil permeable brick of the present invention.

[0030] Figure 4 It is a schematic diagram of the particles prepared by the granulating device for the construction waste soil permeable brick of the present invention.

[0031] Figure 5 It is a process flow chart of the granulating and forming preparation of the construction waste soil permeable brick in the present invention.

[0032] Description of the Reference Numerals

[0033] 1 - Extrusion assembly; 2 - Granulating screen; 3 - Rotary blade;

[0034] 4 - Rotating shaft; 5 - Chassis. Detailed Embodiments

[0035] The granulation device used in the granulation molding preparation method of the engineering muck permeable brick of the present invention is described in detail through Example 1.

[0036] Example 1

[0037] As Figures 1 to 3 shown, the granulation device used in the granulation molding preparation method of the engineering muck permeable brick of the present invention includes an extrusion assembly 1 and a granulation screen 2 disposed at the extrusion outlet of the extrusion assembly 1. The screen holes in the granulation screen 2 are equilateral triangles. A cutting assembly is provided at the lower end of the extrusion outlet of the extrusion assembly 1. The cutting assembly includes a chassis 5 and a rotary blade 3 mounted on the chassis 5 through a rotating shaft 4, and the rotating shaft 4 is opposite to the center of the extrusion outlet of the extrusion assembly 1.

[0038] In the granulation device of the present invention, a granulation screen 2 is provided for sieving and shaping the material extruded from the extrusion outlet in the extrusion assembly 1 to form particles. By limiting the screen holes in the granulation screen 2 to be equilateral triangles, it is ensured that the particles are triangular prism particles, as Figure 4 shown; by providing a cutting assembly at the lower end of the extrusion outlet of the extrusion assembly 1 for cutting and separating the sieved material to form particles, and by mounting a rotary blade 3 on the chassis 5 in the cutting assembly through a rotating shaft 4, and the rotating shaft 4 is opposite to the center of the extrusion outlet of the extrusion assembly 1, it is ensured that the rotary blade 3 stably cuts the sieved material at the extrusion outlet uniformly and effectively along the circumferential direction.

[0039] Generally, in the granulation device of the present invention, the side length of the granulation screen 2 is 100 mm - 140 mm, the side length of the equilateral triangle of the screen hole is 2 mm - 4 mm, the thickness of the rotary blade 3 is 1 mm - 2 mm, the length is 50 mm - 70 mm, and the rotation speed of the rotating shaft 4 is 100 r / min - 150 r / min.

[0040] Preferably, the side length of the granulation screen 2 is 100 mm, the side length of the equilateral triangle of the screen hole is 2 mm, the thickness of the rotary blade 3 is 1 mm, and the length is 50 mm.

[0041] The granulation molding preparation method of the engineering muck permeable brick of the present invention is described in detail through Examples 2 - 5.

[0042] The engineering muck used in Examples 2 - 5 of the present invention is the muck excavated from the Xi'an municipal subway. The mass content of SiO2 is 71.91%, the mass content of CaO is 4.98%, and the water content is 2.4%, which meets the general requirements of the present invention for engineering muck. The chemical components in the engineering muck are shown in Table 1 below.

[0043] Table 1 Chemical composition table of engineering muck

[0044]

[0045] Example 2

[0046] As Figure 1 shown, the raw materials of the engineering soil and rock permeable brick in this embodiment include engineering soil and rock, coal gangue, waste porcelain powder, binder and swelling agent; the engineering soil and rock permeable brick includes the following components by mass fraction based on dry basis: 60 parts of engineering soil and rock, 30 parts of coal gangue, 10 parts of waste porcelain powder, the binder is feldspar, and the mass of the binder is 5% of the total mass of engineering soil and rock, coal gangue and waste porcelain powder, the swelling agent is water glass, and the mass of the swelling agent is 2% of the total mass of engineering soil and rock, coal gangue and waste porcelain powder.

[0047] The binder in this embodiment can also be replaced by one or more of feldspar, bentonite, and calcium sulfate other than feldspar, and the swelling agent can also be replaced by one or two or more of silicon carbide, water glass, wood chips, and dolomite powder other than water glass.

[0048] As Figure 5 shown, the preparation method of the engineering soil and rock permeable brick in this embodiment includes the following steps:

[0049] Step 1: Screen and remove impurities from the engineering soil and rock and coal gangue, and dry them to constant weight at 100°C ± 5°C.

[0050] Step 2: Place the dried engineering soil and rock in Step 1 into a ball mill for grinding to a particle size of less than 0.15 mm; first place the dried coal gangue in Step 1 into a jaw crusher for crushing to a particle size of less than 0.5 mm, and then place it into a ball mill for grinding to a particle size of less than 0.15 mm.

[0051] Step 3: According to the designed composition of the target product permeable brick, add the engineering soil and rock with a particle size of less than 0.15 mm, the coal gangue with a particle size of less than 0.15 mm, fly ash, waste porcelain powder, binder, and swelling agent in Step 2 into a mixer, and dry-mix and slowly stir at a rotation speed of 60 r / min for 5 min until fully mixed. Then spray water on the mixed dry materials in the mixer, and mix and stir at 120 r / min for 5 min to obtain a uniformly mixed wet material; the added mass of water is 10% of the mass of the mixed dry materials.

[0052] Step 4: Seal and homogenize the wet material obtained in Step 3 for 48 h to obtain a homogenized material.

[0053] Step 5: Feed the homogenized material obtained in Step 4 into a granulation device for extrusion granulation. Place the homogenized material into the extrusion die of the extrusion assembly 1 and fill it up. Then extrude the homogenized material through the granulation screen 2 in the extrusion die, and use the rotary blade 3 to cut along the extrusion port to obtain triangular prism particles; the bottom edge length of the triangular prism particles is 2 mm, and the edge height is 3 mm.

[0054] Step 6: Uniformly place the triangular prism particles obtained in Step 5 into a brick-making mold and press them statically to form a green brick; the static pressing is carried out in a gradient pressure application manner. First, apply a pressure of 1 MPa for pre-pressing and positioning and hold the pressure for 10 s, and then apply a pressure of 5 MPa for final pressing. The thickness of the green brick is 25 mm;

[0055] Step 7: Send the green brick obtained in Step 6 into a drying kiln for drying and curing, and then send it into a kiln for roasting. After natural cooling to room temperature, take it out to obtain an engineering soil permeable brick; the drying temperature for the drying and curing is 100 °C ± 5 °C, and the moisture content of the green brick after drying and curing is less than 3%; the roasting regime of the kiln is as follows: first heat it at a heating rate of 2 °C / min to 200 °C, then heat it at a heating rate of 4 °C / min to 900 °C and hold for 30 min, and continue to heat it at a heating rate of 4 °C / min to the firing temperature of 1100 °C and hold for 120 min.

[0056] After testing, the compressive strength of the permeable brick obtained in this example can reach 28 MPa, and the water permeability coefficient can reach 0.54 cm / s.

[0057] Example 3

[0058] The difference between this example and Example 2 is that the engineering soil permeable brick includes the following components in parts by mass based on dry basis: 60 parts of engineering soil, 40 parts of coal gangue, the binder is bentonite, and the mass of the binder is 10% of the total mass of the engineering soil and coal gangue, the swelling agent is water glass, and the mass of the swelling agent is 1% of the total mass of the engineering soil and coal gangue;

[0059] The added mass of water in Step 3 of the permeable brick preparation method is 12% of the mass of the mixed dry materials.

[0060] After testing, the compressive strength of the permeable brick obtained in this example can reach 40 MPa, and the water permeability coefficient can reach 0.45 cm / s.

[0061] Example 4

[0062] The difference between this example and Example 1 is that the engineering soil permeable brick includes the following components in parts by mass based on dry basis: 70 parts of engineering soil, 20 parts of coal gangue, 10 parts of waste porcelain powder, the binder is feldspar, and the mass of the binder is 8% of the total mass of the engineering soil, coal gangue and waste porcelain powder, the swelling agent is sawdust, and the mass of the swelling agent is 2% of the total mass of the engineering soil, coal gangue and waste porcelain powder;

[0063] The added mass of water in Step 3 of the permeable brick preparation method is 12% of the mass of the mixed dry materials;

[0064] The kiln firing system described in step seven of the permeable brick preparation method is: first heat to 200°C at a heating rate of 2°C / min, then heat to 900°C at a heating rate of 4°C / min and keep warm for 30 minutes, and continue to heat to the firing temperature of 1150°C at a heating rate of 4°C / min and keep warm for 120 minutes.

[0065] After testing, the compressive strength of the permeable brick obtained in this embodiment can reach 36MPa, and the permeability coefficient can reach 0.41cm / s.

[0066] Example 5

[0067] The difference between this embodiment and embodiment 1 is that the construction waste soil permeable brick includes the following components by mass on a dry basis: 80 parts of construction waste soil, 20 parts of waste porcelain powder, the binder is bentonite, and the mass of the binder is 8% of the total mass of the construction waste soil and the waste porcelain powder, and the swelling agent is sawdust, and the mass of the swelling agent is 2% of the total mass of the construction waste soil and the waste porcelain powder;

[0068] In step 3 of the method for preparing permeable bricks, the mass of water added is 15% of the mass of the mixed dry materials;

[0069] The bottom edge length of the triangular prism particles in step 5 of the permeable brick preparation method is 4 mm, and the edge height is 4 mm;

[0070] In step 6 of the method for preparing permeable bricks, a gradient pressurization method is used, first applying a 1MPa pressure pre-pressing positioning and holding pressure for 10s, and then applying a 10MPa pressure final pressure, and the thickness of the brick is 20mm;

[0071] The kiln firing system described in step seven of the permeable brick preparation method is: first heat to 200°C at a heating rate of 2°C / min, then heat to 900°C at a heating rate of 4°C / min and keep warm for 30 minutes, and continue to heat to the firing temperature of 1200°C at a heating rate of 4°C / min and keep warm for 150 minutes.

[0072] After testing, the compressive strength of the permeable brick obtained in this embodiment can reach 31MPa, and the permeability coefficient can reach 0.27cm / s.

[0073] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for preparing a granulation and molding of a water-permeable brick made of construction slag, characterized in that: The method sequentially prepares raw materials, mixes and stirs, homogenizes, granulates, statically presses, dries and roasts to obtain permeable bricks; the raw materials include construction slag, coal gangue, waste porcelain powder, adhesive and swelling agent; the construction slag permeable bricks include the following components in mass parts on a dry basis: 60-80 parts of construction slag, 0-40 parts of coal gangue, 0-20 parts of waste porcelain powder, the adhesive is one or more of feldspar, bentonite and calcium sulfate, and the mass of the adhesive is 5%-10% of the total mass of the construction slag, coal gangue and waste porcelain powder; the swelling agent is one or more of silicon carbide, water glass, wood chips and dolomite powder, and the mass of the swelling agent is 1%-2% of the total mass of the construction slag, coal gangue and waste porcelain powder.

2. The granulation molding preparation method of a construction slag permeable brick according to claim 1, characterized in that: The construction slag permeable brick comprises the following components in parts by mass on a dry basis: 60 parts of construction slag, 30 parts of coal gangue, and 10 parts of waste porcelain powder; the adhesive is bentonite, and the mass of the adhesive is 5% of the total mass of the construction slag, coal gangue, and waste porcelain powder; the swelling agent is water glass, and the mass of the swelling agent is 2% of the total mass of the construction slag, coal gangue, and waste porcelain powder.

3. The method for preparing a granulation-molding construction slag water-permeable brick according to claim 1, characterized in that: The particles obtained by the granulation are triangular prism particles.

4. A granulating device used in the granulating and molding preparation method of the construction slag water-permeable brick according to any one of claims 1 to 3, characterized in that: The invention comprises an extrusion component (1) and a granulation screen (2) matched with the extrusion component (1) at the extrusion outlet, wherein the screen holes in the granulation screen (2) are equilateral triangles, and a cutting component is arranged at the lower end of the extrusion outlet of the extrusion component (1), wherein the cutting component comprises a chassis (5) and a rotating blade (3) mounted on the chassis (5) via a rotating shaft (4), and the rotating shaft (4) is opposite to the center of the extrusion outlet of the extrusion component (1).

5. The granulating device according to claim 4, characterized in that: The side length of the granulating screen (2) is 100 mm to 140 mm, the side length of the equilateral triangle of the screen hole is 2 mm to 4 mm, the thickness of the rotating blade (3) is 1 mm to 2 mm, the length is 50 mm to 70 mm, and the rotation speed of the rotating shaft (4) is 100 r / min to 150 r / min.

6. A method for preparing engineering slag permeable bricks using the granulating device as claimed in claim 4 or 5, characterized in that: The method comprises the following steps: Step 1: remove impurities from the construction slag and coal gangue by screening, and dry them at 100°C ± 5°C to constant weight; Step 2: Place the construction slag dried in step 1 in a ball mill and grind it to a particle size of less than 0.15 mm; Place the coal gangue dried in step 1 in a jaw crusher to crush it to a particle size of less than 0.5 mm, and then place it in a ball mill to grind it to a particle size of less than 0.15 mm; Step 3: According to the design composition of the target product permeable brick, the engineering slag with a particle size of less than 0.15 mm, the coal gangue with a particle size of less than 0.15 mm, the waste porcelain powder, the adhesive and the swelling agent in step 2 are added into a mixer, and the mixture is slowly stirred for 5 to 6 minutes at a speed of 60 r / min until it is fully mixed, and then water is sprayed on the mixed dry materials in the mixer, and the mixture is stirred for 5 to 6 minutes at a speed of 120 r / min to obtain a uniformly mixed wet material; the mass of the water added is 10% to 15% of the mass of the mixed dry materials; Step 4: The mixed wet material obtained in step 3 is sealed and homogenized for 48 hours to obtain a homogenized material; Step 5, sending the homogenized material obtained in step 4 into a granulation device for extrusion granulation to obtain triangular prism particles; the bottom edge length of the triangular prism particles is 2mm to 4mm, and the edge height is 2mm to 4mm; Step 6: evenly place the triangular prism particles obtained in step 5 in a brick-making mold and statically press them to obtain a brick blank; the static pressing molding adopts a gradient pressurization method, first applying a 1MPa pressure pre-pressing positioning pressure holding 10s, and then applying a 5MPa-10MPa pressure final pressure, and the thickness of the brick blank is 20mm-25mm; Step seven, sending the bricks obtained in step six into a drying kiln for drying and curing, and then sending them into a kiln for roasting, cooling them naturally to room temperature and taking them out to obtain engineering slag permeable bricks; the drying temperature of the drying and curing is 100℃±5℃, and the moisture content of the bricks after drying and curing is less than 3%; the kiln roasting system is: first heating to 200℃ at a heating rate of 2℃ / min, then heating to 900℃ at a heating rate of 4℃ / min and keeping warm for 30min, and continuing to heat to a firing temperature of 1100℃~1200℃ at a heating rate of 4℃ / min and keeping warm for 120min~150min.

7. The method according to claim 6, characterized in that The extrusion granulation process described in step 5 is: the homogenized material is placed in the extrusion die of the extrusion component (1) and filled, and then the homogenized material is extruded from the extrusion die through the granulation screen (2), and is cut along the extrusion port by a rotating blade (3) to obtain triangular prism particles.

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