Water treatment system for quartz sand screening

Abstract

A quartz sand screening water treatment system comprises a centrifugal separation tank, a vibrating screen, a mud filtering device, a sludge filter pressing device, a flocculation device and a water storage pool. The centrifugal separation tank is provided with a slurry outlet and a sand outlet. The slurry outlet is located at the top of the centrifugal separation tank, and the sand outlet is located at the bottom of the centrifugal separation tank. The vibrating screen is located directly below the sand outlet of the centrifugal separation tank to screen the quartz sand. The slurry outlet of the centrifugal separation tank is connected with the mud filtering device through a pipeline to convey the mud to the mud filtering device. The mud filtering device is provided with a mud outlet and a water outlet. The mud outlet of the mud filtering device is connected with the sludge filter pressing device, and the water outlet of the mud filtering device is connected with the flocculation device through a pipeline. The water outlet of the flocculation device is connected with the water storage pool through a pipeline. Compared with the natural sedimentation of mud sand slurry, the occupation area is significantly reduced, and the clay and quartz sand therein can be fully recovered.

Description

Technical Field

[0001] This utility model relates to the field of quartz sand processing technology, and in particular to a quartz sand screening water treatment system. Background Technology

[0002] Quartz sand has various uses, one of which is as a fracturing proppant in the oil industry. When used as a fracturing proppant in oil, quartz sand has strict requirements regarding particle size. Therefore, it needs to be washed and screened for grading. Screening involves flushing the sand through sieves of different mesh sizes to obtain quartz sand with different mesh counts. During screening, quartz sand of different mesh counts and drilling mud also enter the water flow, forming a mud-slurry. Currently, this mud-slurry is generally only recycled after settling, with the clean water being reused. The solid material, due to its high clay content, is generally discarded or used as soil, while the quartz sand is wasted. Furthermore, natural settling takes a long time to purify the water, requiring large settling ponds and significant site area requirements. Utility Model Content

[0003] Therefore, it is necessary to provide a space-saving and highly efficient water treatment system for quartz sand screening.

[0004] A quartz sand screening water treatment system includes a centrifugal separator, a vibrating screen, a slurry filter, a sludge filter press, a flocculation device, and a water storage tank. The centrifugal separator has a slurry outlet and a sand outlet. The slurry outlet is located at the top of the centrifugal separator, and the sand outlet is located at the bottom of the centrifugal separator. The vibrating screen is located directly below the sand outlet of the centrifugal separator to screen quartz sand. The slurry outlet of the centrifugal separator is connected to the slurry filter via a pipeline to transport slurry to the slurry filter. The slurry filter has a mud outlet and a water outlet. The mud outlet of the slurry filter is connected to the sludge filter press, and the water outlet of the slurry filter is connected to the flocculation device via a pipeline. The water outlet of the flocculation device is connected to the water storage tank via a pipeline.

[0005] Preferably, the upper end of the centrifugal separator is cylindrical, the lower end is conical, and the feed inlet of the centrifugal separator is tangent to the upper end of the centrifugal separator.

[0006] Preferably, the mud filtration device includes a filter bed and a high-pressure spraying mechanism. The diversion pipe is used to transport mud, and the outlet of the diversion pipe is located directly above the filter bed to spread the mud onto the filter bed. The high-pressure spraying mechanism is located below the filter bed to clean the filter bed. The filter bed includes a fixed support, an upper support roller, a guide roller, a lower support roller, and a first filter cloth. The two sides of the upper support roller are connected to the upper end of the fixed support, the two sides of the guide roller are connected to the end of the fixed support, and the two sides of the lower support roller are connected to the lower end of the fixed support. The first filter cloth is arranged around the upper support roller, the guide roller, and the lower support roller and is rotatable.

[0007] Preferably, the sludge dewatering device includes a frame, several pressure rollers, an upper filter cloth, and a lower filter cloth. The frame is connected to both ends of the pressure rollers. The pressure rollers are distributed in a serpentine pattern on the frame. The upper and lower filter cloths are located within the serpentine gaps formed by the pressure rollers to compress the sludge. The first ends of the upper and lower filter cloths form sludge inlets, and the last ends of the upper and lower filter cloths form sludge outlets.

[0008] Preferably, the flocculation device includes a flocculation tank, a flocculant preparation tank, and an overflow trough. A mud-water isolation tank is provided at the center of the flocculation tank. The mud-water isolation tank is connected to the outlet of the mud filtration device through a pipe. The mud-water isolation tank is also connected to the flocculant preparation tank through a pipe. The overflow trough is set at the edge of the flocculation tank to allow clear water to overflow. The outlet of the overflow trough is connected to a water storage tank through a pipe to put the overflowed water into the water storage tank.

[0009] Beneficial effects: This invention first separates quartz sand and clay-rich slurry using a centrifugal separator. The quartz sand, mixed with water, is then separated using a vibrating screen. The clay-rich slurry is then filtered to separate the clay. After pressing, the moisture content of the separated clay is significantly reduced, and it can be returned to the field after simple drying. The mud-water generated during clay separation is further separated into water and solids through flocculation and sedimentation. The water entering the reservoir can be used for quartz sand screening after accumulation. Compared to naturally settled mud and sand slurry, this process significantly reduces the land area required and allows for the full recovery of clay and quartz sand. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the water treatment system for quartz sand screening according to this utility model.

[0011] In the diagram: quartz sand screening water treatment system 10, centrifugal separator 20, vibrating screen 30, mud filtration device 40, filter bed 401, high-pressure spraying mechanism 402, sludge filter press 50, pressure roller 501, upper filter cloth 502, lower filter cloth 503, flocculation device 60, flocculation tank 601, mud-water isolation tank 6011, flocculant preparation tank 602, overflow tank 603, water storage tank 70. Detailed Implementation

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] It should be understood that the same or similar reference numerals in the accompanying drawings of the embodiments correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "front," "rear," "left," "right," "top," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0014] Please refer to Figure 1 A quartz sand screening water treatment system 10 includes a centrifugal separator 20, a vibrating screen 30, a mud filter 40, a sludge dewatering device 50, a flocculation device 60, and a water storage tank 70. The centrifugal separator 20 is provided with a slurry outlet and a sand outlet. The slurry outlet of the centrifugal separator 20 is located at the top of the centrifugal separator 20, and the sand outlet of the centrifugal separator 20 is located at the bottom of the centrifugal separator 20. The vibrating screen 30 is located directly below the sand outlet of the centrifugal separator 20 to screen quartz sand. The slurry outlet of the centrifugal separator 20 is connected to the mud filter 40 through a pipeline to transport mud to the mud filter 40. The mud filter 40 is provided with a mud outlet and a water outlet. The mud outlet of the mud filter 40 is connected to the sludge dewatering device 50, and the water outlet of the mud filter 40 is connected to the flocculation device 60 through a pipeline. The water outlet of the flocculation device 60 is connected to the water storage tank 70 through a pipeline.

[0015] The centrifugal separator 20 of this invention is used to separate quartz sand and clay in slurry. Quartz sand has a high density, and under centrifugal action, the quartz sand containing water flows out from the bottom of the centrifugal separator 20, while the clay containing water, i.e., the slurry, flows out from the top of the centrifugal separator 20.

[0016] This utility model, the vibrating screen 30, is used to separate quartz sand containing water according to its particle size.

[0017] The mud filtration device 40 of this invention is used to separate clay from mud. During the separation process, muddy water with a low clay concentration is also generated. This muddy water is then passed through the flocculation device 60 to flocculate and separate the clay. The separated clear water enters the storage tank 70. The filtered clay still contains a high moisture content, which affects the stacking of the clay. The sludge dewatering device 50 can dewater the clay, making it easier to stack.

[0018] In a preferred embodiment, the upper end of the centrifugal separator 20 is cylindrical, the lower end of the centrifugal separator 20 is conical, and the feed inlet of the centrifugal separator 20 is tangent to the upper end of the centrifugal separator 20.

[0019] Because the clay particles are very small, they cannot be separated by the vibrating screen 30. This invention uses a mud filtration device 40 to filter the clay from the mud.

[0020] In a preferred embodiment, the mud filtration device 40 includes a filter bed 401 and a high-pressure spraying mechanism 402. The drainage pipe is used to transport mud, and the outlet of the drainage pipe is located directly above the filter bed 401 to spread the mud onto the filter bed 401. The high-pressure spraying mechanism 402 is located below the filter bed 401 to clean the filter bed 401. The filter bed 401 includes a fixed bracket, an upper support roller, a guide roller, a lower support roller, and a first filter cloth. The two sides of the upper support roller are connected to the upper end of the fixed bracket, the two sides of the guide roller are connected to the end of the fixed bracket, and the two sides of the lower support roller are connected to the lower end of the fixed bracket. The first filter cloth is arranged around the upper support roller, the guide roller, and the lower support roller and is rotatable.

[0021] The first filter cloth filters the clay in the mud. The filter cloth can be made of wear-resistant and corrosion-resistant materials such as polyester or nylon. After filtration, the filter cloth is washed by a high-pressure spray mechanism 402 after rotation, allowing it to be reused.

[0022] In a preferred embodiment, the sludge dewatering device 50 includes a frame, a plurality of pressure rollers 501, an upper filter cloth 502, and a lower filter cloth 503. The frame is connected to both ends of the pressure rollers 501. The plurality of pressure rollers 501 are distributed in a serpentine pattern on the frame. The upper filter cloth 502 and the lower filter cloth 503 are located in the serpentine gaps formed by the pressure rollers 501 to squeeze the sludge. The first ends of the upper filter cloth 502 and the lower filter cloth 503 form sludge inlets, and the tail ends of the upper filter cloth 502 and the lower filter cloth 503 form sludge outlets.

[0023] After the sludge enters between the upper filter cloth 502 and the lower filter cloth 503, the water in the sludge is squeezed out as the filter cloth moves, and the mud and water are also clarified by sedimentation through the flocculation device 60.

[0024] In a preferred embodiment, the flocculation device 60 includes a flocculation tank 601, a flocculant preparation tank 602, and an overflow tank 603. A mud-water isolation tank 6011 is provided at the center of the flocculation tank 601. The mud-water isolation tank 6011 is connected to the outlet of the mud filtration device 40 through a pipe. The mud-water isolation tank 6011 is also connected to the flocculant preparation tank 602 through a pipe. The overflow tank 603 is set at the edge of the flocculation tank 601 to allow clear water to overflow. The outlet of the overflow tank 603 is connected to a water storage tank 70 through a pipe to put the overflowed water into the water storage tank 70.

[0025] After entering the mud-water separation tank 6011, the muddy water mixes with the mud slurry, and then the clay in the muddy water is flocculated and settled. The clear water overflows and enters the storage tank. The storage tank has two functions: first, to store water; and second, to allow small amounts of impurities to settle.

[0026] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A water treatment system for quartz sand screening, characterized in that: The system includes a centrifugal separator, a vibrating screen, a mud filtration device, a sludge dewatering device, a flocculation device, and a water storage tank. The centrifugal separator has a slurry outlet and a sand outlet. The slurry outlet is located at the top of the centrifugal separator, and the sand outlet is located at the bottom of the centrifugal separator. The vibrating screen is located directly below the sand outlet of the centrifugal separator to screen quartz sand. The slurry outlet of the centrifugal separator is connected to the mud filtration device through a pipeline to transport the mud to the mud filtration device. The mud filtration device has a mud outlet and a water outlet. The mud outlet of the mud filtration device is connected to the sludge dewatering device, and the water outlet of the mud filtration device is connected to the flocculation device through a pipeline. The water outlet of the flocculation device is connected to the water storage tank through a pipeline.

2. The quartz sand screening water treatment system as described in claim 1, characterized in that: The upper end of the centrifugal separator is cylindrical, the lower end is conical, and the feed inlet of the centrifugal separator is tangent to the upper end of the centrifugal separator.

3. The quartz sand screening water treatment system as described in claim 1, characterized in that: The mud filtration device includes a filter bed, a high-pressure spraying mechanism, and a diversion pipe for conveying mud. The outlet of the diversion pipe is located directly above the filter bed to spread the mud onto the filter bed. The high-pressure spraying mechanism is located below the filter bed to clean the filter bed. The filter bed includes a fixed support, an upper support roller, a guide roller, a lower support roller, and a first filter cloth. The two sides of the upper support roller are connected to the upper end of the fixed support, the two sides of the guide roller are connected to the end of the fixed support, and the two sides of the lower support roller are connected to the lower end of the fixed support. The first filter cloth is arranged around the upper support roller, the guide roller, and the lower support roller and is rotatable.

4. The quartz sand screening water treatment system as described in claim 1, characterized in that: The sludge dewatering device includes a frame, several pressure rollers, an upper filter cloth, and a lower filter cloth. The frame is connected to both ends of the pressure rollers. The pressure rollers are distributed in a serpentine pattern on the frame. The upper and lower filter cloths are located within the serpentine gaps formed by the pressure rollers to compress the sludge. The beginning ends of the upper and lower filter cloths form sludge inlets, and the end ends of the upper and lower filter cloths form sludge outlets.

5. The quartz sand screening water treatment system as described in claim 1, characterized in that: The flocculation device includes a flocculation tank, a flocculant preparation tank, and an overflow trough. A mud-water isolation tank is located at the center of the flocculation tank. The mud-water isolation tank is connected to the outlet of the mud filtration device through a pipe. The mud-water isolation tank is also connected to the flocculant preparation tank through a pipe. The overflow trough is located at the edge of the flocculation tank to allow clear water to overflow. The outlet of the overflow trough is connected to a water storage tank through a pipe to allow the overflowing water to be placed into the water storage tank.

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