Mechanism sand tailings grinding treatment system

Abstract

The application belongs to the technical field of highway engineering material processing, and particularly discloses a machine-made sand tailings grinding treatment system. The machine-made sand tailings grinding treatment system comprises a first elevator, a first sorting machine, a grinding machine, a collector and a storage device connected in sequence, the grinding machine comprises a second sorting machine and a grinding machine arranged below the second sorting machine, the grinding machine comprises an inner cylinder, an outer cylinder and a grinding chamber, the inner cylinder is sleeved in the outer cylinder, and the inner part of the inner cylinder is a buffer chamber; a stone powder partition plate is arranged in the buffer chamber, the fixed end of the stone powder partition plate is connected with the inner cylinder, and the free end of the stone powder partition plate faces the grinding chamber. In the production process, the machine-made sand tailings grinding treatment system avoids the qualified machine-made sand tailings from entering the grinding machine again, reduces equipment wear and tear, and the stone powder partition plate arranged in the grinding machine can quickly form a material layer from unqualified stone powder, so that the grinding efficiency is greatly improved.

Description

Technical field

[0001] The invention relates to the technical field of highway engineering material processing, in particular to a machine-made sand tailings grinding processing system. [Background Technology]

[0002] Natural sand is a non-renewable local resource. With the increasing scale of national infrastructure construction and the gradual strengthening of environmental protection measures for farmland and rivers, the use of natural sand resources has been restricted. According to incomplete statistics, the use of manufactured sand in concrete is gradually increasing. Since 2008, my country's sand and gravel consumption has increased annually, and the total amount of sand and gravel aggregates used has exceeded 20 billion tons. The proportion of manufactured sand in total sand and gravel consumption has also increased annually, exceeding 18 billion tons, accounting for nearly 90%. It is expected that in 3-5 years, manufactured sand will completely replace natural sand.

[0003] The production of manufactured sand inevitably generates a large amount of tailings. Currently, the productivity of sand-making equipment ranges from 15% to 35%, resulting in no less than 4 billion tons of tailings produced nationwide annually. Roadbed backfill and cement blending methods can only consume approximately 50% of this material. Landfill remains the primary disposal method, severely impacting the ecological restoration of cultivated and forested land. The environmental pollution and resource waste caused by manufactured sand tailings have become a serious problem.

[0004] To address the environmental pollution problem of limestone machine-made sand tailings, researchers ground the limestone machine-made sand tailings to produce limestone powder that meets the requirements of "Limestone Powder for Cement, Mortar, and Concrete" GB / T 35164-2017. The moisture content of machine-made sand tailings must be strictly controlled during grinding. If the moisture content exceeds 1.5%, grinding efficiency will be reduced, and caking will occur, eventually clogging the storage tank. The moisture content of machine-made sand tailings varies greatly, typically ranging from 0.5-3%, making it difficult for existing production lines to meet production needs. Machine-made sand tailings also have the characteristics of small particles (the mass proportion of particles ≤45μm is greater than 50%). When grinding in ordinary ball mills and Raymond mills, the strong wind and negative pressure in the closed chamber cause a large number of particles to suspend, greatly obstructing the sorting channel, resulting in reduced work efficiency, increased energy consumption, and uncontrolled grinding quality.

[0005] For example, Chinese invention patent application CN 108816483 A discloses a machine-made sand production system, which includes a vibrating feeder, a coarse crusher, a fine crusher, a main sand making machine and a wind-powered powder selection device. The machine-made sand production system optimizes the production process, treats the materials differently, and then gradually selects materials that meet the particle size requirements by grading and screening the materials to prevent qualified materials from being repeatedly crushed and ground. Although the system improves the sand formation rate and reduces energy consumption to a certain extent, the production system does not perform screening before the first grinding to screen out the initially qualified tailings, so that all raw materials are subjected to coarse and fine crushing before grading and screening, which increases the loss of the coarse crusher and the fine crusher. In addition, the production system does not solve the problem of a large number of particles suspended in the chamber during the material crushing process, which hinders the operation of the equipment, further reducing work efficiency and increasing energy consumption. [Summary of the invention]

[0006] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a machine-made sand tailings grinding and processing system. During the production process, the machine-made sand tailings grinding and processing system avoids qualified machine-made sand tailings from entering the grinding mill again, reducing equipment loss, and arranging stone powder partitions in the grinding mill to quickly form unqualified stone powder into a material layer, greatly improving the grinding efficiency; the processing system will increase the stone powder grinding efficiency by more than 50% and greatly reduce energy consumption and production costs.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A machine-made sand tailings grinding and processing system, the system includes a first elevator, a first separator, a grinder, a collector and a storage device connected in sequence; the grinder includes a second separator and a grinder arranged below the second separator, the grinder includes an inner cylinder, an outer cylinder and a grinding chamber, the inner cylinder is sleeved inside the outer cylinder, the interior of the inner cylinder is a buffer chamber, the inner cylinder and the outer cylinder surround to form a powder suction channel, the upper port of the powder suction channel and the upper port of the buffer chamber are both connected to the second separator, the lower port of the powder suction channel and the lower port of the buffer chamber are both connected to the grinding chamber, and the grinding chamber is provided with a grinding roller for grinding; a stone powder partition is provided in the buffer chamber, the fixed end of the stone powder partition is connected to the inner cylinder, and the free end of the stone powder partition faces the grinding chamber, the stone powder partition divides the buffer chamber into an upper chamber and a lower chamber, the upper chamber and the lower chamber are connected through an opening, and the area of ​​the opening is 1 / 3-3 / 4 of the cross-sectional area of ​​the buffer chamber.

[0009] Furthermore, the grinding roller is arranged on the bottom surface of the grinding chamber and is located directly below the buffer chamber; the inner cylinder is connected to the inner wall of the outer cylinder through a connecting rod.

[0010] Furthermore, the first elevator is connected to the first classifier through a first screw conveyor, the first classifier is connected to the grinding mill through a second screw conveyor, the first classifier is connected to the collector through a first connecting pipe, the grinding mill is connected to the collector through a second connecting pipe, and the collector is connected to the storage through a third screw conveyor; the first screw conveyor, the second screw conveyor, the first connecting pipe, the second connecting pipe, and the third screw conveyor are used to transport machine-made sand tailing particles.

[0011] Furthermore, the third spiral conveying pipe is connected to the storage device through a dust removal device and a second elevator in sequence.

[0012] Furthermore, the stone powder partition is in a hollow frustum shape, the large diameter end edge of the hollow frustum-shaped stone powder partition is connected to the inner wall of the inner cylinder, and the small diameter end of the hollow frustum-shaped stone powder partition faces the grinding chamber.

[0013] Furthermore, the plane where the stone powder partition is located forms an angle of 55-75 degrees with the inner wall of the inner tube.

[0014] Furthermore, the cross-sectional area of ​​the small-diameter end of the hollow frustum-shaped stone powder partition is 1 / 2 of the cross-sectional area of ​​the buffer chamber.

[0015] Furthermore, the outer diameter of the inner cylinder is 100 cm, and the inner diameter of the outer cylinder is 120-140 cm.

[0016] Due to the use of the technical solution of the present invention, the present invention has at least the following beneficial effects:

[0017] (1) The machine-made sand tailings grinding and processing system of the present invention adopts the combination of "selection before grinding" and "grinding and sorting semi-isolation". The "selection before grinding" technology is to add a sorting step at the front end of the grinding mill, and sort it through the first sorting machine. The qualified machine-made sand tailings are directly sent to the collector through the first connecting pipe, and the unqualified machine-made sand tailings are sent to the grinding mill through the first screw conveyor, thereby avoiding the qualified machine-made sand tailings from entering the grinding mill again, reducing equipment loss, and greatly improving work efficiency; the "grinding and sorting semi-isolation" technology is to set a stone powder partition inside the grinding mill to effectively block the suspension of unqualified fine particles in the buffer chamber of the grinding mill, quickly forming a grinding material layer, and greatly improving the grinding efficiency. With the combination of the two technologies, not only can the stone powder grinding efficiency be improved by more than 50%, but also the energy consumption and production costs can be greatly reduced, and the quality of the finished product can be improved.

[0018] (2) The present invention aims to solve the problem that the particles of the machine-made sand tailings are too fine. After entering the grinder, the fine particles are suspended in the entire chamber of the grinder under the action of the negative pressure in the chamber, making it difficult for them to enter the grinding chamber and be effectively ground by the grinding roller, thereby reducing work efficiency. A stone powder partition is specifically set in the grinder to partially separate the interior of the grinder, thereby avoiding the phenomenon of fine particles being suspended in large quantities under the action of upward suction, so that the fine particles can quickly enter the grinding chamber to be ground, thereby improving work efficiency; however, after the stone powder partition is added, the attraction of the ground powder is restricted, and it is impossible to effectively enter the second sorting machine from the buffer chamber for sorting. Therefore, in order to solve this problem, the present invention provides a powder suction channel formed by an inner cylinder and an outer cylinder in the grinder. In this way, the ground machine-made sand tailings are effectively sucked into the sorting machine for sorting through the double channel formed by the powder suction channel and the buffer chamber under the action of negative pressure.

Brief Description of the Drawings

[0019] Figure 1 It is a structural schematic diagram of the machine-made sand tailings grinding and processing system of the present invention.

[0020] Figure 2 yes Figure 1 Schematic diagram of the structure of the medium grinding machine.

[0021] Figure 3 It is a process flow chart of the machine-made sand tailings grinding and processing system of the present invention.

[0022] The main component symbols are described as follows:

[0023] In the figure, 1-first elevator, 2-first separator, 3-grinding machine, 3-1-second separator, 3-1-1 classifier, 3-2-grinder, 3-2-1-inner cylinder, 3-2-1-1 stone powder partition, 3-2-1-2-buffer chamber, 3-2-1-2-1-upper chamber, 3-2-1-2-2-lower chamber, 3-2-2 outer cylinder, 3-2-3 grinding chamber, 3-2-3-1 grinding roller, 3-2-4-connecting rod, 3-3-powder suction channel, 4-collector, 5-storage device, 6-first screw conveyor, 7-second screw conveyor, 8-third screw conveyor, 9-first connecting pipe, 10-second connecting pipe, 11-dust removal device, 12-second elevator.

[0024] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. [Specific implementation method]

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] like Figure 1 As shown, in a preferred embodiment of the present invention, the machine-made sand tailings grinding and processing system includes a first elevator 1, a first screw conveyor 6, a first classifier 2, a second screw conveyor 7, a grinder 3, a collector 4, a third screw conveyor 8, a dust removal device 11, a second elevator 12 and a storage 5; the first elevator 1 is connected to the first classifier 2 through the first screw conveyor 6; the first classifier 2 is connected to the grinder 3 through the second screw conveyor 7, the first classifier 2 is connected to the collector 4 through the first connecting pipe 9, the grinder 3 is connected to the collector 4 through the second connecting pipe 10, and the collector 4 is connected to the storage 5 through the third screw conveyor 8.

[0027] The first hoist 1 is used to lift the machine-made sand tailings to a certain height, so that the machine-made sand tailings enter the first classifier 2 from top to bottom from the first screw conveyor 6. The purpose of choosing the top-down feeding method is to ensure the stability of the amount of machine-made sand tailings entering the first classifier 2 and avoid the phenomenon of segmented material; the first classifier 2 is used to select qualified machine-made sand tailings from the raw materials, and send the qualified machine-made sand tailings to the collector 4, and send the unqualified machine-made sand tailings to the grinding mill 3; the collector 4 is a cyclone collector 4, which is used to fully mix the machine-made sand tailings sorted by the first classifier 2 and the second classifier 3-1, and quickly settle the suspended particles to achieve dust-free production process; the dust removal device 11 is used to eliminate the negative pressure in the pipeline and prevent the powder from escaping to the outside and causing dust pollution; the second hoist 12 is used to lift the machine-made sand tailings to a certain height, so that the machine-made sand tailings enter the storage 5 from top to bottom; the storage 5 is used to seal and store the processed machine-made sand tailings.

[0028] Since the main component of the machine-made sand tailings is CaCO3 and the particle size is small (the content of machine-made sand tailings with a particle size <45 μm is greater than 50%), the machine-made sand tailings particles are easy to adhere to the surface of the pipeline and are not easy to slide or roll, causing pipe blockage. In this embodiment, a screw conveyor is used to transport the machine-made sand tailings to the next processing device in a rotating manner, effectively solving the problem of easy pipe blockage during transportation; at the same time, the first connecting pipe 9 and the second connecting pipe 10 connected to the negative pressure suction source are used to transport the machine-made sand tailings of qualified mesh size, and the stone powder is sucked into the next processing device under the action of negative pressure.

[0029] Continue reading Figure 2The grinding mill 3 includes a second classifier 3-1 and a grinder 3-2 arranged below the second classifier 3-1. The grinder 3-2 includes an inner cylinder 3-2-1, an outer cylinder 3-2-2 and a grinding chamber 3-2-3. The inner cylinder 3-2-1 is sleeved inside the outer cylinder 3-2-2. The interior of the inner cylinder 3-2-1 is a buffer chamber 3-2-1-2. The inner cylinder 3-2-1 and the outer cylinder 3-2-2 surround to form a powder suction channel 3-3. The upper port of the powder suction channel 3-3 is The upper port of the buffer chamber 3-2-1-2 is connected to the second separator 3-1, and the lower port of the powder suction channel 3-3 and the lower port of the buffer chamber 3-2-1-2 are connected to the grinding chamber 3-2-3, that is, the lower port of the powder suction channel 3-3, the lower port of the buffer chamber 3-2-1-2 and the grinding chamber 3-2-3 are connected to each other; a grinding roller 3-2-3-1 for grinding powder is provided on the bottom surface of the grinding chamber 3-2-3, and the grinding roller 3-2-3- 1 is located directly below the buffer chamber 3-2-1-2; the inner cylinder 3-2-1 is connected to the inner wall of the outer cylinder 3-2-2 through a connecting rod 3-2-4; a stone powder partition 3-2-1-1 is provided in the buffer chamber 3-2-1-2, and the stone powder partition 3-2-1-1 is hollow frustum-shaped, the edge of the large diameter end of the hollow frustum-shaped stone powder partition 3-2-1-1 is connected to the inner wall of the inner cylinder 3-2-1, and the small diameter end of the hollow frustum-shaped stone powder partition 3-2-1-1 faces the In the grinding chamber 3-2-3, the outer wall of the hollow frustum-shaped stone powder partition 3-2-1-1 forms an angle of 55-75° with the inner wall of the inner cylinder 3-2-1. The cross-sectional area of ​​the smaller diameter end of the hollow frustum-shaped stone powder partition 3-2-1-1 is 1 / 2 of the cross-sectional area of ​​the buffer chamber 3-2-1-2. The hollow frustum-shaped stone powder partition 3-2-1-1 divides the buffer chamber 3-2-1-2 into an upper chamber 3-2-1-2-1 and a lower chamber 3-2-1-2-2, which are interconnected. The grinder 3-2 is used to grind unqualified machine-made sand tailings. The second separator 3-1 is used to screen qualified machine-made sand tailings and send the screened qualified machine-made sand tailings to the collector 4. The unqualified machine-made sand tailings pass through the buffer chamber 3-2-1-2 and fall into the grinding chamber 3-2-3 for further grinding.

[0030] like Figure 3As shown, the working principle / workflow of the above-mentioned machine-made sand tailings grinding and processing system is as follows: the original machine-made sand tailings are lifted to the first screw conveyor 6 by the action of the first hoist 1, and the first screw conveyor 6 conveys the machine-made sand tailings to the first separator 2. The machine-made sand tailings that meet the requirements sorted by the first separator 2 enter the collector 4 through the first connecting pipe 9, and the machine-made sand tailings that do not meet the requirements are conveyed to the grinding mill 3 through the second screw conveyor 7 for grinding and sorting. The ground machine-made sand tailings enter the second separator 3-1 through the powder suction channel 3-3 or the buffer chamber 3-2-1-2 under the action of negative pressure suction. The second separator 3-1 passes through the classifier The materials with qualified particle size screened out by 3-1-1 are sent to the collector 4 through the second connecting pipe 10, and the unqualified machine-made sand tailings fall into the grinding chamber 3-2-3 through the buffer chamber 3-2-1-2 under the action of gravity and are ground again by the grinding roller 3-2-3-1. The above steps are repeated in sequence until all the machine-made sand tailings are ground to the point that they can pass the screening of the classifier 3-1-1 and enter the collector 4; after the qualified machine-made sand tailings enter the collector 4, they are sent to the dust removal device 11 through the third screw conveyor 8 for dust removal and elimination of negative pressure in the pipe, and then enter the storage 5 for storage under the action of the second elevator 12. At this time, the entire processing process is completed.

[0031] In the present invention, the first elevator 1, the first sorting machine 2, the collector 4, the dust removal device 11, the second elevator 12 and the storage 5 are all existing technologies. In order to save space, their specific structures will not be described here.

[0032] In another embodiment of the present invention, the stone powder partition 3-2-1-1 is semicircular, the edge of the arc end of the semicircle is connected to the inner wall of the inner cylinder 3-2-1, and the diameter end of the semicircle faces the grinding chamber 3-2-3.

[0033] In another embodiment of the present invention, the stone powder partition 3-2-1-1 can be of other shapes, and the size of the opening connecting the upper chamber 3-2-1-2-1 and the lower chamber 3-2-1-2-2 can be of other specifications, as long as the stone powder partition 3-2-1-1 can effectively block some unqualified fine machine-made sand tailings particles from entering the second separator 3-1 and does not affect the machine-made sand tailings from smoothly passing through the buffer chamber 3-2-1-2 into the grinding chamber 3-2-3.

[0034] In summary, the machine-made sand tailings grinding and processing system of the present invention adopts "selection before grinding" combined with "grinding and sorting semi-isolation". Among them, the "selection before grinding" technology is to add a sorting step at the front end of the grinding mill 3, and sorting is performed by the first sorting machine 2. The qualified machine-made sand tailings in the sorting are directly sent to the collector 4 through the first connecting pipe 9, and the unqualified machine-made sand tailings are sent to the grinding mill 3 through the first screw conveyor 6, thereby avoiding the phenomenon that the qualified machine-made sand tailings enter the grinding mill 3 for grinding again, thereby reducing equipment loss and greatly improving work efficiency; the "grinding and sorting semi-isolation" technology is to set the stone powder partition 3-2-1-1 inside the buffer chamber 3-2-1-2, thereby effectively blocking unqualified fine particles and suspending them in the lower chamber 3-2-1-2-2, so that the fine particles quickly enter the inner grinding chamber 3-2-3 to complete grinding, thereby greatly improving the grinding and sorting efficiency. The combination of the above two technologies increases the efficiency of stone powder grinding by more than 50%, and can greatly reduce energy consumption and production costs, and improve the quality of finished products.

[0035] The above description is a detailed description of the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. Any equivalent changes or modifications completed under the technical spirit suggested by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A machine-made sand tailings grinding and processing system, characterized in that: The system includes a first elevator, a first classifier, a grinding mill, a collector and a storage device connected in sequence; the grinding mill includes a second classifier and a grinder arranged below the second classifier, the grinder includes an inner cylinder, an outer cylinder and a grinding chamber, the inner cylinder is sleeved inside the outer cylinder, the interior of the inner cylinder is a buffer chamber, the inner cylinder and the outer cylinder surround to form a powder suction channel, the upper port of the powder suction channel and the upper port of the buffer chamber are both connected to the second classifier, the lower port of the powder suction channel and the lower port of the buffer chamber are both connected to the grinding chamber, and a grinding roller for grinding is provided in the grinding chamber; a stone powder partition is provided in the buffer chamber. Plate, the fixed end of the stone powder partition is connected to the inner cylinder, and the free end of the stone powder partition faces the grinding chamber, the stone powder partition divides the buffer chamber into an upper chamber and a lower chamber, the upper chamber and the lower chamber are connected through an opening, the area of ​​the opening is 1 / 3-3 / 4 of the cross-sectional area of ​​the buffer chamber; the stone powder partition is hollow frustum-shaped, the large diameter end edge of the hollow frustum-shaped stone powder partition is connected to the inner wall of the inner cylinder, and the small diameter end of the hollow frustum-shaped stone powder partition faces the grinding chamber; the grinding roller is arranged on the bottom surface of the grinding chamber and is located directly below the buffer chamber; the inner cylinder is connected to the inner wall of the outer cylinder through a connecting rod.

2. The machine-made sand tailings grinding and processing system according to claim 1, characterized in that: The first elevator is connected to the first classifier through a first screw conveyor, the first classifier is connected to the grinding mill through a second screw conveyor, the first classifier is connected to the collector through a first connecting pipe, the grinding mill is connected to the collector through a second connecting pipe, and the collector is connected to the storage through a third screw conveyor.

3. The machine-made sand tailings grinding and processing system according to claim 2, characterized in that: The third spiral conveying pipe is connected to the storage via a dust removal device and a second elevator in sequence.

4. The machine-made sand tailings grinding and processing system according to claim 1, characterized in that: The plane where the stone powder partition is located forms an angle of 55-75 degrees with the inner wall of the inner tube.

5. The machine-made sand tailings grinding and processing system according to claim 1, characterized in that: The cross-sectional area of ​​the small-diameter end of the hollow frustum-shaped stone powder partition is 1 / 2 of the cross-sectional area of ​​the buffer chamber.

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