CN115055261A - Large-scale dry-method sand making system and method - Google Patents
Large-scale dry-method sand making system and method Download PDFInfo
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- CN115055261A CN115055261A CN202210431196.4A CN202210431196A CN115055261A CN 115055261 A CN115055261 A CN 115055261A CN 202210431196 A CN202210431196 A CN 202210431196A CN 115055261 A CN115055261 A CN 115055261A
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- 239000004576 sand Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 51
- 230000007246 mechanism Effects 0.000 claims abstract description 47
- 239000000463 material Substances 0.000 claims abstract description 39
- 238000007599 discharging Methods 0.000 claims abstract description 28
- 238000012216 screening Methods 0.000 claims abstract description 23
- 230000004048 modification Effects 0.000 claims abstract description 12
- 238000012986 modification Methods 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000000428 dust Substances 0.000 claims description 30
- 238000004519 manufacturing process Methods 0.000 claims description 22
- 238000001035 drying Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 4
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 13
- 238000009826 distribution Methods 0.000 abstract description 5
- 239000000843 powder Substances 0.000 description 10
- 239000004575 stone Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention belongs to the technical field of sand making, and relates to a large-scale dry-method sand making system which comprises a feeding conveying mechanism, a roller press, a lifter, a scattering and distributing device, a vibrating screening mechanism and a discharging conveying mechanism which are sequentially connected, wherein the vibrating screening mechanism comprises at least two vibrating screens, the feeding conveying mechanism is respectively connected with the at least two vibrating screens through the scattering and distributing device, and fine material outlets of the at least two vibrating screens are connected with the discharging conveying mechanism. A large-scale dry-method sand making method comprises the following steps: the raw materials are treated by a roller press, conveyed to a scattering and distributing device by a feeding and conveying mechanism, scattered and modified in shape and uniformly distributed to at least two vibrating screens; and (3) conveying a fine material outlet product in the vibrating screen to a discharge conveying mechanism for discharging, and returning a coarse material outlet return material to the roller press for secondary treatment. The process can greatly improve the single-line productivity of sand making, and effectively solves the problems of feed distribution and shape modification when the vibrating screens are connected in parallel by adopting the scattering and distributing device and canceling the buffer bin process.
Description
Technical Field
The invention belongs to the technical field of sand making, relates to a system and a method for making sand by a dry method, and particularly relates to a system and a method for making sand by a large-scale dry method.
Background
The machine-made sand is sand processed by a sand making machine and other accessory equipment, various stone materials, tailing waste resources and the like can be used for making the sand by the machine, the sand source is wide, the machine-made sand has complete gradation and can be adjusted according to the sand using requirement, and because the environmental protection limit and the influence of river sand resource reduction, the machine-made sand is more and more widely used, the machine-made sand replaces the river sand, which is a great trend.
The main processes of the current machine-made sand production are divided into a dry method and a wet method. The wet method mainly adopts rod milling, and has large water demand and difficult sludge treatment. The dry method mainly uses impact sand making, but the process is not suitable for the current production requirements due to small yield, large abrasion and high fine powder content, the sand making process of the roller press is entering the mainstream, but the current circulating process mainly using the roller press has smaller specification of a vibrating screen, when one roller press is matched with a plurality of vibrating screens, a buffer bin is needed, the sand making of the roller press also has the problem of lower circularity, scattering machine equipment is sometimes needed to be added, the two equipment have larger high influence on the process design, the process is complicated, the buffer bin has the problem of material segregation and influences the stability of the product quality, the current sand making production line of a large machine has complicated process, the single yield of the roller press exceeds 50 percent, the fine powder content is high, the material distribution difficulty of the cooperative work of the plurality of vibrating screens is large due to material distribution limitation, and the circulating processing capacity of the large roller press cannot be effectively exerted, the machine-made sand production line with the single-line capacity of more than 500 tons is difficult to popularize.
Chinese patent application publication No. CN106583005A discloses a gravel machine-made sand production line, which includes a material conveying auger, a sand making machine, a spiral discharging device, a screening device, a dust removing device, a wet mixing device and a sand discharging device, which are connected in sequence, wherein the material is crushed by the sand making machine and then is directly fed into the screening device by the spiral discharging device for screening, because the material crushed by the sand making machine has more dust, the load of the screening device is increased, if the water content of the material is higher, the dust blocks the screen, and small-particle-size stones generated in the sand making process are repeatedly crushed and over-ground, which is not beneficial to energy saving and consumption saving.
The chinese patent application publication No. CN104549619A discloses a dry sand making production line and a sand making method, wherein a hopper conveyor lifts crushed rock into a hopper above a conical sand making machine, and the hopper feeds the material into the conical sand making machine; the cone sand making machine rolls crushed stones into sand mulling through a sand mulling bucket elevator and a sand mulling conveyor belt with different specifications to feed the modular vibration screening device, the over-standard coarse sand and sand materials screened by the modular vibration screening device are returned to a hopper by a cage returning bucket elevator and a cage returning conveyor belt, the coarse sand screened by the modular vibration screening device is output by a coarse sand conveyor belt, the medium sand screened by the modular vibration screening device is output by a medium sand conveyor belt, and the fine sand screened by the modular vibration screening device is output by a fine sand conveyor belt; the modular vibration screening device comprises a screening and blanking part, wherein dust generated during screening and blanking is sucked into a cyclone dust collector through a main negative pressure dust suction port, coarse filtration and dust removal are carried out on the dust by the cyclone dust collector, secondary dust removal is carried out by a pulse bag type dust collector, and the modular vibration screen is adopted to screen out machine-made sand with different particle sizes, but the single-line productivity of the machine-made sand cannot be solved.
Disclosure of Invention
The application aims to solve the problems and provides a large-scale dry-method sand making system;
another object of the present application is to address the above problems and provide a large dry sand making method.
The invention creatively provides a large-scale dry-process sand production system, which comprises a feeding conveying mechanism, a roller press, a hoisting machine, a vibration screening mechanism and a discharging conveying mechanism which are sequentially connected, wherein the vibration screening mechanism comprises at least two vibrating screens, the hoisting machine is respectively connected with the at least two vibrating screens through a scattering and distributing device, and fine material outlets of the at least two vibrating screens are connected with the discharging conveying mechanism.
The roller press is matched with the parallel vibrating screening mechanism, the single-line sand production capacity can be greatly improved, the buffering bin process is omitted by the aid of the scattering and distributing device, and the feeding distribution problem and the shape correction problem when the vibrating screens are connected in parallel are effectively solved.
In the above-mentioned large-scale dry-process sand production system, the scattering and distributing device includes a casing having a feed inlet and discharge outlets with the same number as the vibrating screens, the discharge outlets are uniformly arranged at the bottom or side bottom of the casing along the circumferential direction, a vertical shaft rotor is arranged in the casing, and a low-speed scattering mechanism is radially arranged on the vertical shaft rotor.
In the above-mentioned large-scale dry-method sand production system, the low-speed break-up mechanism includes:
the dispersing structure is provided with a plurality of blade structures which are uniformly distributed along the circumferential direction;
the shape modification structure is provided with a support rod arranged in the radial direction and a hammer head arranged at the outer end of the support rod.
The uniform distribution, stable feeding and the improvement of the circularity are synchronously realized, and the improvement of the product quality is facilitated.
In the large dry-method sand production system, the dispersing structures and the shape correcting structures are axially arranged on the vertical shaft rotor at intervals.
In the above-mentioned large-scale dry-process sand production system, the outer diameter of the dispersion structure is larger than the outer diameter of the modification structure.
Further promoted the plastic effect of mechanism sand, improved the striking probability of material with the structure of repairing the shape, guaranteed the effective hammering to the material to reach better circularity.
In the above-mentioned large-scale dry-process sand production system, the casing is further provided with an air outlet connected with a dust removal device, and the dust removal device is provided with a dust remover fan with a frequency conversion device.
The fan of the dust remover adopts a frequency conversion device to adjust the air quantity, changes the air flow rate of a channel in the scattering and distributing machine, effectively controls the content of fine powder in the scattering and shaping processes, is favorable for controlling the content of fine powder under the conditions of strict product quality requirements or excessive raw material fine powder, and improves the product quality.
In the large-scale dry-process sand production system, the coarse material outlets of the at least two vibrating screens are positioned at the inlet end of the elevator and connected with the feeding port of the roller press, and the discharging ports of the at least two vibrating screens are positioned at the outlet end of the elevator.
The self length of the vibrating screen is adopted to solve the conveying problem of returning the discharged material to the hoister, so that the height is effectively reduced, conveying equipment is reduced, and the manufacturing cost and the occupied area are saved.
A large-scale dry-method sand making method is characterized by comprising the following steps:
1) the raw materials are treated by a roller press and then are conveyed to a scattering and distributing device by a lifter to be scattered and modified and evenly distributed to at least two vibrating screens;
2) and a fine material outlet product in the vibrating screen is conveyed to a discharging conveying mechanism for discharging, and a coarse material outlet feed back is returned to the roller press for secondary treatment.
In the above-mentioned large-scale dry-method sand making method, the linear speed of the low-speed scattering mechanism in the scattering and distributing device is lower than 35 m/s. The scattering and distributing device runs at a low speed, only rotates at 1/3-1/2 of the rotating speed of the impact sand making machine, the impact strength is greatly reduced, scattering and shape modification are met, abrasion is reduced, and the service life of easily-abraded parts is prolonged.
In the large-scale dry-method sand making method, the ratio of the discharge amount to the feed back amount of the roller press has a cyclic coefficient of 1.8-4.5. The circulation coefficient is controlled by adjusting the pressure of the roller press and the speed of the hoister, so that the content of fine powder is reduced, finished products are effectively separated, and ineffective crushing is reduced.
Compared with the prior art, the application has the advantages that:
1) the roller press is matched with the parallel vibrating screening mechanism, the single-line production capacity of sand making can be greatly improved, the buffering bin process is omitted by the aid of the scattering and distributing device, continuous processing is achieved, and the problems of feeding distribution and shape correction when the vibrating screens are connected in parallel are effectively solved.
2) The material is modified by the low-speed dispersing mechanism, the modification capability of the material is improved by adopting a mode of matching the dispersing structure with the modification structure, the circularity of the material is improved, the abrasion of the material is reduced, and fine powder is reduced.
Drawings
FIG. 1 is a schematic process flow diagram provided herein.
Fig. 2 is a schematic view of a breaking and distributing device provided by the present application.
In the figure: the device comprises a roller press 1, a lifter 2, a scattering and distributing device 3, a shell 30, a feeding hole 31, a discharging hole 32, a vertical shaft rotor 33, a low-speed scattering mechanism 34, a scattering structure 341, a shape modifying structure 342, an air outlet 35, a vibrating screening mechanism 4, a vibrating screen 40, a discharging and conveying mechanism 5, a dust removing device 6, a dust remover fan 60 and a feeding and conveying mechanism 7.
Detailed Description
Further illustrated by the following specific examples;
in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments disclosed below.
Example 1
As shown in fig. 1, a large-scale dry-process sand making system includes feeding and conveying mechanism 7, roller press 1, elevator 2, scattering and distributing device 3, vibration screening mechanism 4 and discharging and conveying mechanism 5 which are connected in sequence, vibration screening mechanism 4 includes two vibrating screens 40, elevator 2 is connected with two vibrating screens 40 through scattering and distributing device 3, and the fine material outlet of the two vibrating screens 40 is connected with discharging and conveying mechanism 5, and the coarse material outlet of the two vibrating screens 40 is connected with the feeding port of roller press 1 to carry out the feed back processing on the material with the overlarge particle size.
The elevator 2 may be a bucket elevator.
The two vibrating screens 40 are respectively located on two sides of the elevator 2, coarse material outlets of the two vibrating screens 40 are located at an inlet end of the elevator 2, and discharging openings of the two vibrating screens 40 are located at an outlet end of the elevator 2. The vibrating screen 40 solves the problem of material discharging and returning through the length of the vibrating screen, effectively reduces the height and reduces conveying equipment.
The elevator 2 and the scattering and distributing device 3 are connected with a dust removal device 6, and the discharge end of the dust removal device 6 is connected with a discharge conveying mechanism 5 or other transportation equipment.
As shown in FIG. 2, the top center of the breaking-up and distributing device 3 has a feeding port 31, and the bottom of the breaking-up and distributing device is symmetrically provided with a housing 30 having two discharging ports 32, and the discharging ports 32 are arranged obliquely.
The housing 30 is provided with a vertical shaft rotor 33, and the low-speed scattering mechanism 34 is radially arranged on the vertical shaft rotor 33. The low-speed dispersing mechanism 34 includes a dispersing structure 341 and a modifying structure 342. The dispersing structure 341 has a plurality of blade structures uniformly distributed in the circumferential direction. The shape modifying structure 342 has a support rod arranged radially and a hammer head arranged at the outer end of the support rod, and the hammer head is cylindrical.
The dispersion structure 341 and the modification structure 342 are axially spaced apart on the vertical shaft rotor 33. The outer diameter of the dispersion structure 341 is larger than the outer diameter of the modification structure 342.
The casing 30 is further provided with an air outlet 35 connected with the dust removing device 6, and the dust removing device 6 is provided with a dust remover fan 60 with a frequency conversion device.
The large-scale dry-method sand making method comprises the following steps:
1) the raw materials are treated by a roller press 1 and then are conveyed to a scattering and distributing device 3 by a lifter 2, a low-speed scattering mechanism 34 scatters and shapes at a speed of which the linear speed is lower than 35 m/s, and a dust removal device 6 adjusts the wind speed according to the circulation coefficient by a frequency conversion device and uniformly distributes the wind speed to two vibrating sieves 40;
2) and (3) conveying the fine material outlet products in the vibrating screen 40 to the discharging conveying mechanism 5 for discharging, returning the coarse material outlet return materials to the roller press 1 for secondary treatment, wherein the ratio circulation coefficient R of the discharging amount and the return material amount of the roller press 1 is between 1.8 and 4.5.
Specifically, the wind speed V ═ V 0 +0.25R, initial wind speed V 0 Is 0.3-1 m/s and can be realized according to a PLC control circuit.
Example 2
This embodiment is substantially the same as embodiment 1 except that the dust removing device 6 removes dust using the same wind speed.
Example 3
This embodiment is substantially the same as embodiment 1, except that a plurality of layers of linear vibrating screens are used as the vibrating screens 40, and the machine-made sand is classified and discharged separately.
Comparative example
This comparative example is basically the same as embodiment 1, except that, does not set up the feed divider 3 of breaing up, and commercially available machine of breaing up is connected to lifting machine 2, adopts the machine of breaing up DSJ of Zhongshan hong rui te environmental protection equipment science and technology Limited company, connects the surge bin and advances two shale shakers after dividing the material.
The same batch of tailing raw materials are adopted to prepare sand by adopting the systems and the methods of the embodiment 1, the embodiment 2 and the comparative example respectively, wherein the types and the specifications of the vibrating screens 40 are the same, the requirement of the machine-made sand grain diameter is less than 5mm, and V in the embodiment 1 and the comparative example 0 The wind speed of example 2 was 1.5 m/s, with the results shown in the table below.
| Example 1 | Example 2 | Comparative example | |
| Degree of circularity | 0.95 | 0.92 | 0.82 |
| Content of |
4％ | 6％ | 12％ |
The results show that the system and the method can improve the circularity of the machine-made sand and reduce the content of the stone powder, and particularly, the frequency conversion mode is adopted for machining the machine-made sand, so that the content of the stone powder can be greatly reduced.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although the terms roller press 1, elevator 2, breaking and distributing device 3, housing 30, feed inlet 31, discharge outlet 32, vertical shaft rotor 33, low speed breaking mechanism 34, dispersing structure 341, shaping structure 342, air outlet 35, vibrating screening mechanism 4, vibrating screen 40, discharge conveying mechanism 5, dust removing device 6, dust remover fan 60, feed conveying mechanism 7, etc. are used more herein. These terms are used merely to more conveniently describe and explain the nature of the present invention and they are to be interpreted as any additional limitation which is not in accordance with the spirit of the present invention.
Claims (10)
1. The utility model provides a large-scale dry-process sand making system, includes feeding conveyor (7), roll squeezer (1), lifting machine (2), breaks up feed divider (3), shale shaker divides mechanism (4) and ejection of compact conveying mechanism (5) that connect gradually, its characterized in that: the vibrating screening mechanism (4) comprises at least two vibrating screens (40), the elevator (2) is respectively connected with the at least two vibrating screens (40) through the scattering and distributing device (3), and fine material outlets of the at least two vibrating screens (40) are connected with the discharging and conveying mechanism (5).
2. The large scale dry-method sand production system of claim 1, wherein: the scattering and distributing device (3) comprises a shell (30) with a feeding hole (31) and discharging holes (32) the same as the vibrating screens (40) in number, the discharging holes (32) are uniformly formed in the bottom or the side bottom of the shell (30) along the circumferential direction, a vertical shaft rotor (33) is arranged in the shell (30), a low-speed scattering mechanism (34) is radially arranged on the vertical shaft rotor (33), the vertical shaft is connected with a variable frequency motor, and different rotating speeds correspondingly adjust the granularity and the grading of the machine-made sand.
3. A large scale dry sand production system according to claim 2 wherein the low speed break up mechanism (34) comprises:
a dispersion structure (341) having a plurality of blade structures uniformly distributed in a circumferential direction;
the shape modification structure (342) is provided with a support rod arranged in the radial direction and a hammer head arranged at the outer end of the support rod.
4. A large scale dry-to-process sand production system as defined in claim 3, wherein: the dispersion structures (341) and the modification structures (342) are arranged on the vertical shaft rotor (33) at intervals along the axial direction.
5. The large scale dry-method sand production system according to claim 4, wherein: the outer diameter of the dispersion structure (341) is larger than that of the modification structure (342).
6. A large-scale dry-process sand production system according to claim 2, characterized in that: an air outlet (35) connected with a dust removal device (6) is further formed in the shell (30), and a dust remover fan (60) with a frequency conversion device is arranged on the dust removal device (6).
7. The large scale dry-method sand production system of claim 1, wherein: the coarse material outlets of the at least two vibrating screens (40) are positioned at the inlet end of the lifting machine (2) and connected with the feeding port of the roller press (1), and the discharging ports of the at least two vibrating screens (40) are positioned at the outlet end of the lifting machine (2).
8. A large scale dry sand making method according to the system of any one of claims 1 to 7, characterized by the following steps:
1) the method comprises the following steps of (1) processing raw materials through a roller press (1), conveying the raw materials to a scattering and distributing device (3) through a lifting machine (2), scattering and modifying shapes, and uniformly distributing the raw materials into at least two vibrating screens (40);
2) and a fine material outlet product in the vibrating screen (40) is conveyed to a discharging conveying mechanism (5) for discharging, and a coarse material outlet feed back is returned to the roller press (1) for secondary treatment.
9. The large-scale dry sand making method according to claim 8, characterized in that: the linear speed of the low-speed scattering mechanism (34) in the scattering and distributing device (3) is lower than 35 m/s.
10. The large-scale dry sand making method according to claim 8, characterized in that: the ratio cyclic coefficient of the discharge amount and the feed back amount of the roller press (1) is between 1.8 and 4.5.
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| CN202210431196.4A CN115055261A (en) | 2022-04-22 | 2022-04-22 | Large-scale dry-method sand making system and method |
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| CN202210431196.4A CN115055261A (en) | 2022-04-22 | 2022-04-22 | Large-scale dry-method sand making system and method |
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