Sand washing method for high-silt-content material
Through the cyclone grading scrubbing process and the agitation effect of the scrubbing machine, the problem of high mud content sand materials with high mud content is solved, efficient mud and sand separation and water resource conservation are achieved, and equipment investment and maintenance costs are reduced.
Patent Information
- Application Number
- CN202411733820.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-03-18
AI Technical Summary
Sand materials with high mud content are difficult to effectively clean due to the high clay of the soil during the sand washing process, resulting in low site investment and water resource utilization.
The cyclone grading scrubbing process is adopted, and the primary and secondary cyclone grading is graded, combined with the stirring of the scrubber, the sand is separated from the mud on its outer surface, and the finished sand is further obtained through the dehydration screen.
It effectively reduces the system's water consumption, saves water resources, reduces equipment investment and maintenance costs, improves fine sand recovery rate, and realizes resource utilization.
Smart Images
Figure CN119634036A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of sand washing, and in particular relates to a sand washing method for materials with high mud content. Background Art
[0002] "Sand" is widely used as a raw material in civil engineering fields such as construction and road construction. When sand is mined, soil or other impurities are usually attached to the surface. The mud content of the raw sand mined varies according to the different geology. In recent years, with the emphasis on resource utilization, people have begun to extract sand from waste, which not only disposes of waste but also obtains valuable sand and gravel aggregates, such as construction waste, shield waste, river silt, etc. The above raw materials usually have a high mud content. According to the standard of mud content in sand, in order to achieve the cleaning effect, it is necessary to increase sand washing equipment and increase the flushing volume, which increases the initial investment cost. In summary, when the mud content in the original sand increases, the mud attached to the surface of the sand is difficult to clean due to its high viscosity. In order to reduce the overall site investment and the utilization rate of flushing water, a sand washing method for high-mud content materials is proposed to solve the above problems. Summary of the invention
[0003] The object of the present invention is to overcome the shortcomings of the prior art and provide a sand washing method for materials with high mud content.
[0004] The present invention adopts the following technical solution: A sand washing method for materials with high mud content comprises the following steps: Step 1, the material is sent to the feed bin through the conveying device, and the material larger than 100 mm is sent out of the feed bin through the feed bin sieve plate, and the material smaller than 100 mm is transported to the water washing screen through the feed belt conveyor under the feed bin; Step 2: The water washing screen will screen the materials smaller than 100 mm, so that the materials of 40-100 mm and 5-40 mm are sent out of the water washing screen respectively, and the materials smaller than 5 mm are collected into the water collection tank below the water washing screen together with the sprayed sewage; Step 3, pumping the slurry in the sump to the primary cyclone. After the slurry is classified by the primary cyclone, part of the mud and sewage is discharged from the overflow port at the top of the primary cyclone, and the material reaching the set concentration is discharged from the bottom of the primary cyclone into the scrubbing machine; Step 4: The scrubber is working, and the material is stirred in the form of slurry by the stirring device of the scrubber. The particles are rubbed and scrubbed against each other, so that the sand and the mud on its outer surface are separated from each other. Then the scrubbed material is discharged into the recovery tank below the dewatering screen, wherein the overflow port at the top of the primary cyclone can be connected to the recovery tank, and the sewage generated by the dewatering screen and the sewage overflowing from the top of the primary cyclone dilute the material in the recovery tank to a slurry concentration of 50-60%; Step 5: Pump the material with the slurry concentration meeting the standard into the secondary cyclone. After the separation action of the secondary cyclone, the obtained sand is discharged from the bottom onto the dewatering screen. After the dewatering screen works, the finished sand with a moisture content of 15-25% is obtained.
[0005] Furthermore, in step 1, the water-washing screen is installed at an inclination angle of 18-20°, and includes a first sieve plate and a second sieve plate arranged opposite to each other up and down, the aperture of the first sieve plate is 40 mm, and the aperture of the second sieve plate is 5 mm.
[0006] Furthermore, in step 5, the sewage overflowing from the top of the secondary cyclone is discharged into a sedimentation tank, and flocculants are added to the sedimentation tank to precipitate a small amount of sludge in the sewage, and the upper clear liquid overflows into the clear water tank for reuse by the system.
[0007] Furthermore, in step 3, the overflow port at the top of the primary cyclone may also be connected to a sedimentation tank, and the sewage overflowing from the top thereof may be discharged into the sedimentation tank.
[0008] Furthermore, the mud content of the material is 28-35%.
[0009] Furthermore, the feed bin sieve plate is obliquely installed on the feed bin, and its aperture is 100 mm.
[0010] Furthermore, the sieve plate aperture of the dewatering screen is 0.5 mm.
[0011] From the above description of the present invention, it can be seen that compared with the prior art, the present invention has the following beneficial effects: the method mentioned in the present invention adopts a cyclone classification scrubbing process, and the water overflowing from the cyclone can be returned to the system for use again, effectively reducing the water consumption of the system and saving water resources; the split flow classification scrubbing process adopted in the method mentioned in the present invention, the scrubbing machine itself works in a high concentration state, and requires less water; the method mentioned in the present invention is simple and easy to maintain, and when the mud content increases, it does not need to add other equipment for multiple cleaning, but only needs to increase the volume of the scrubbing machine to increase the scrubbing time, thereby achieving the purpose of mud and sand separation; The sand washing method defined in the present application, in addition to the first amount of water added, the subsequent added water can be replenished by the recycled water generated when the system is running, so as to make rational use of water resources to the greatest extent. The system has relatively few water adding points, which reduces the use of pipelines and avoids pipeline maintenance; and the number of equipment is small, which effectively reduces the site cost, equipment investment and subsequent maintenance cost; the system can efficiently separate mud and sand, with a high fine sand recovery rate, and realize resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 Schematic diagram of the sand washing method of the present invention; In the figure, 1-feeding bin, 2-water washing screen, 3-water collecting tank, 4-primary cyclone, 5-scrubbing machine, 6-secondary cyclone, 7-dewatering screen, 8-sedimentation tank, 9-clear water tank, 10-recovery tank. DETAILED DESCRIPTION
[0013] The present invention is further described below through specific implementation modes.
[0014] Reference Figure 1 As shown, a sand washing method for materials with high mud content comprises the following steps: Step 1, the material with a mud content of 30% is sent to the feed bin 1 through the conveying device, the material larger than 100 mm is sent out of the feed bin 1 through the feed bin sieve plate, and the material smaller than 100 mm is transported to the water washing screen 2 through the feed belt conveyor under the feed bin 1; Step 2, the water washing screen 2 works to screen the materials smaller than 100 mm, so that the materials of 40-100 mm and 5-40 mm are sent out of the water washing screen 2 respectively, and the materials smaller than 5 mm are collected into the water collection tank 3 below the water washing screen 2 together with the sprayed sewage; Step 3, pumping the slurry in the sump 3 to the primary cyclone 4, after the slurry is classified by the primary cyclone 4, part of the mud and sewage is discharged from the overflow port at the top of the primary cyclone 4, and the material reaching the set concentration is discharged from the bottom of the primary cyclone 4 into the scrubber 5; Step 4: The scrubber 5 works, and the material is stirred in the form of slurry by the stirring device of the scrubber 5. The particles are rubbed and scrubbed against each other, so that the sand and the mud on its outer surface are separated from each other. Then, the scrubbed material is discharged into the recovery tank 10 below the dewatering screen 7. The overflow port at the top of the primary cyclone 4 can be connected to the recovery tank 10. The sewage generated by the dewatering screen 7 and the sewage overflowing from the top of the primary cyclone 4 dilute the material in the recovery tank 10 to a slurry concentration of 50-60%. Step 5, the material with the slurry concentration meeting the standard is pumped into the secondary cyclone 6, and the obtained sand is discharged from the bottom to the dewatering screen 7 after the separation effect of the secondary cyclone 6, and the finished sand with a moisture content of 15-25% is obtained after the dewatering screen 7 works. Among them, the sewage overflowing from the top of the secondary cyclone 6 is discharged into the sedimentation tank 8, and flocculants are added to the sedimentation tank 8 to precipitate a small amount of sludge in the sewage, and the upper clear liquid overflows into the clear water tank 9 for reuse by the system.
[0015] Among them, in step 1, the feed bin sieve plate is installed obliquely on the feed bin 1, and its aperture is 100mm; the water washing screen 2 is installed at an inclination angle of 18-20°, and includes a first sieve plate and a second sieve plate arranged opposite to each other up and down, the aperture of the first sieve plate is 40mm, and the aperture of the second sieve plate is 5mm; specifically, a vibration motor is provided on the feed bin 1 to prevent the raw material from adhering to the feed bin due to excessive mud content, which is not conducive to feeding; the water washing screen is in a high position, and the material less than 100mm screened by the feed bin 1 is transported to the water washing screen 2 through a feeding belt conveyor. The sieve plate of the water washing screen 2 is usually two-layer, and the number of screenings can be increased or decreased according to demand, and a spray system is provided above each layer of the sieve plate, which can effectively reduce the dust caused by the height difference when the material falls, and can also effectively wash away the attachments on the surface of large particles. The 40-100mm material screened out by the upper sieve plate and the 5-40mm material screened out by the lower sieve plate The materials are sent out by two discharging belt conveyors and stacked for subsequent processing and utilization; further, the sieve plates on the feed bin 1 and the sieve plates on the water washing screen 2 are both polyurethane sieve plates, which effectively prevent the problem of material adhesion and reduced production efficiency.
[0016] In step 3, the overflow port at the top of the primary cyclone 4 can also be connected to the sedimentation tank 8, and the sewage overflowing from the top thereof can be discharged into the sedimentation tank 8. During operation, the sewage overflowing from the top of the primary cyclone 4 can be discharged into the recovery tank 10 or the sedimentation tank 8 according to the operation status of the on-site system.
[0017] In step 5, the aperture of the dewatering screen plate is 0.5 mm. After being separated from the primary cyclone 4 and the secondary cyclone 6, most of the mud is separated into the sewage by the cyclone, and some mud remains in the sand. In order to ensure the mud content requirement, it is necessary to remove the last small part of the mud on the dewatering screen 7. Specifically, a spray system is provided at the feed end of the dewatering screen 7. When the material flowing out of the bottom of the secondary cyclone 6 enters the dewatering screen plate, the spray system supplies water, so that the material is in a fluidized state during dewatering and screening, which is beneficial to the stratification of the material and is more conducive to the screening and removal of small particles. Furthermore, the rear end of the dewatering screen 7 is not provided with a spray system, so that dehydration is more efficient.
[0018] This application specifies a sand washing method for materials with high mud content. In addition to the first water addition, the subsequent added water can be replenished by the recycled water generated when the system is running, so as to make rational use of water resources to the greatest extent. This system has relatively few water addition points, which reduces the use of pipelines and avoids pipeline maintenance; and the number of equipment is small, which effectively reduces site costs, equipment investment and subsequent maintenance costs; this system can efficiently separate mud and sand, with a high fine sand recovery rate, and realize resource utilization.
[0019] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of implementation of the present invention. That is, equivalent changes and modifications made according to the application scope of the present invention and the contents of the specification should still fall within the scope of the present invention.
Claims
1. A sand washing method for materials with high mud content, characterized in that: The following steps are involved: Step 1, the material is sent to the feed bin through the conveying device, and the material larger than 100 mm is sent out of the feed bin through the feed bin sieve plate, and the material smaller than 100 mm is transported to the water washing screen through the feed belt conveyor under the feed bin; Step 2: The water washing screen will screen the materials smaller than 100 mm, so that the materials of 40-100 mm and 5-40 mm are sent out of the water washing screen respectively, and the materials smaller than 5 mm are collected into the water collection tank below the water washing screen together with the sprayed sewage; Step 3, pumping the slurry in the sump to the primary cyclone. After the slurry is classified by the primary cyclone, part of the mud and sewage is discharged from the overflow port at the top of the primary cyclone, and the material reaching the set concentration is discharged from the bottom of the primary cyclone into the scrubbing machine; Step 4: The scrubber is working, and the material is stirred in the form of slurry by the stirring device of the scrubber. The particles are rubbed and scrubbed against each other, so that the sand and the mud on its outer surface are separated from each other. Then the scrubbed material is discharged into the recovery tank below the dewatering screen, wherein the overflow port at the top of the primary cyclone can be connected to the recovery tank, and the sewage generated by the dewatering screen and the sewage overflowing from the top of the primary cyclone dilute the material in the recovery tank to a slurry concentration of 50-60%; Step 5: Pump the material with the slurry concentration meeting the standard into the secondary cyclone. After the separation action of the secondary cyclone, the obtained sand is discharged from the bottom onto the dewatering screen. After the dewatering screen works, the finished sand with a moisture content of 15-25% is obtained.
2. A sand washing method for materials with high mud content according to claim 1, characterized in that: In step 1, the water washing screen is installed at an inclined angle of 18-20 degrees, and includes a first sieve plate and a second sieve plate arranged opposite to each other up and down. The aperture of the first sieve plate is 40 mm, and the aperture of the second sieve plate is 5 mm.
3. The sand washing method for materials with high mud content according to claim 1, characterized in that: In step 5, the sewage overflowing from the top of the secondary cyclone is discharged into the sedimentation tank, and flocculants are added to the sedimentation tank to precipitate a small amount of sludge in the sewage, and the upper clear liquid overflows into the clear water tank for reuse by the system.
4. A sand washing method for materials with high mud content according to claim 3, characterized in that: In step 3, the overflow port at the top of the primary cyclone can also be connected to the sedimentation tank, and the sewage overflowing from the top thereof can be discharged into the sedimentation tank.
5. The sand washing method for high mud content materials according to claim 1, characterized in that: The mud content of the material is 28-35%.
6. The sand washing method for high mud content materials according to claim 1, characterized in that: The feed bin sieve plate is installed on the feed bin at an angle, and its aperture is 100 mm.
7. The sand washing method for high mud content materials according to claim 1, characterized in that: The sieve plate aperture of the dewatering screen is 0.5 mm.