Sand washing plant

Abstract

The application discloses a fine sand sedimentation separator and belongs to the field of sand washing equipment, which comprises a sedimentation separation box body, a wastewater inlet and a wastewater outlet are arranged on the sedimentation separation box body, the wastewater inlet of the fine sand sedimentation separator is used for being connected with a wastewater discharge port of a sand washer, and the lower part of the sedimentation separation box body is a fine sand sedimentation collection area; the fine sand sedimentation collection area is communicated with a conveying pipeline, and a sand pump is arranged on the conveying pipeline. The application effectively prevents the loss of fine sand along with wastewater discharge, guarantees the quality, reduces equipment investment and lowers operation cost.

Description

Technical Field

[0001] This invention relates to the field of sand washing equipment, and in particular to a sand washing device. Background Technology

[0002] Natural sand in nature (i.e., river sand and sea sand) usually contains a lot of impurities, and manufactured sand also contains impurities such as mud and stone powder. When using it, these impurities need to be separated and removed. Since these impurities are generally soluble in water, the sand is usually washed with water using a mechanical washing method to dissolve the harmful substances in the water. Then, the sand and water are separated, and the water carries away the harmful substances to achieve the purpose of purification.

[0003] Current purification processes for sea sand, river sand, and manufactured sand generally involve: using a sand screening machine to remove coarse particles and larger mud lumps, followed by washing with a sand washing machine. Commonly used sand washing machines include chain bucket washing machines, wheel bucket washing machines, and spiral washing machines, etc., and sand-water conveying equipment connects each process. These machines are combined in different quantities and arrangements to form a continuous production line. During the washing and purification process, after the sand and water enter the sand washing machine, the machine's operation agitates and washes, causing harmful substances to dissolve in the water. After sand-water separation, the sand is removed and enters the next stage, while the dissolved harmful substances are discharged with the water.

[0004] In actual production operations, the sand and water are violently agitated in the sand washing machine, causing the water to vibrate intensely. Fine sand particles, with smaller particle sizes, remain suspended in the water and do not settle quickly with the coarse sand. They are discharged with the wastewater, especially when washing sand with high mud content. The wastewater has a particularly high mud content and viscosity, resulting in a large amount of fine sand and some medium sand being discharged with it. Generally, the loss of fine sand with wastewater discharge accounts for approximately 5% to 30% of the total sand volume.

[0005] The common practice for recovering this fine sand using existing technologies is to set up a large, unified wastewater collection pond within the purification production line to collect wastewater from each stage of the production line. A mud pump is then installed in the wastewater pond to pump the wastewater containing fine sand and mud to a dedicated hydrocyclone. After dewatering by the hydrocyclone, the wastewater is sent to a dewatering screen. The dewatered fine sand is then sent to the finished sand outlet of the production line, where it is mixed with the finished sand and sent to the stockpile, or directly transported to the stockpile to mix with the finished sand. This type of fine sand settling and separation device requires a large footprint, numerous pieces of equipment, and significant investment. Only one such fine sand recovery device is installed on each production line. While this method recovers fine sand, the aforementioned fine sand recovery method and device have the following problems:

[0006] 1. After dewatering, the fine sand is usually sent to the final finished sand outlet of the purification process for mixing. This makes it difficult for the recovered fine sand and finished sand to mix evenly. If uniformity is required, more mixing equipment and processes need to be added, resulting in waste and increased costs.

[0007] 2. Sand washing requires multiple repeated washing processes to ensure quality. However, the current method involves recovering fine sand from multiple processes together. The fine sand in the wastewater collection tank is a mixture of sand collected from various washing processes. Some of this fine sand has undergone one, two, or more washing processes. The surface of the fine sand contains harmful substances with varying degrees of cleanliness and quality. Sand particles with different cleanliness levels are mixed together, dehydrated, and then mixed with the finished sand. A significant portion of this fine sand cannot guarantee its quality. Especially in the washing process of sea sand, it generally undergoes multiple sand washing machines, and the cleanliness of the sand varies considerably from one stage to the next. Using a centralized wastewater recovery process for fine sand results in the finished sand containing uncleaned fine sand. In reality, this product cannot meet the required quality standards and poses a potential threat to the safety and durability of the project.

[0008] 3. Because the wastewater collection tank contains a mixture of fine sand and mud after sedimentation, the sand pump pumps the mud and fine sand together to the fine sand recovery machine, making it impossible to separate the mud and sand. Therefore, the fine sand obtained by this fine sand recovery process has a relatively high mud content.

[0009] 4. It is necessary to construct wastewater collection ponds and add equipment and facilities such as mud and sand pumps, pipelines, hydrocyclones, and dewatering screens, which requires large investments and high operating costs, resulting in increased investment and operating costs. Summary of the Invention

[0010] This invention provides a sand washing device that effectively prevents fine sand from being lost with wastewater discharge, ensuring quality while reducing equipment investment, investment, and operating costs.

[0011] The technical solution provided by this invention is as follows:

[0012] A sand washing device includes multiple sand washing machines arranged sequentially, with consecutive sand washing machines directly connected or connected through a feeding channel. The discharge side of the preceding sand washing machine is connected to the feed side of the following sand washing machine, and the sand washed by the preceding sand washing machine enters the following sand washing machine. It also includes a fine sand settling separator. Each sand washing machine with wastewater discharge is equipped with at least one fine sand settling separator. The fine sand settling separator includes a settling and separation box, which is provided with a wastewater inlet and a wastewater outlet. The wastewater inlet of the fine sand settling separator is used to connect to the wastewater discharge outlet of the sand washing machine. The lower part of the settling and separation box is a fine sand settling and collection area, which is connected to a conveying pipe, and a sand pump is installed on the conveying pipe.

[0013] Furthermore, the sedimentation separation box is a shell structure that is closed at the bottom and around the sides and open at the top. The inlet of the conveying pipe extends downward from the opening at the top of the shell structure into the fine sand sedimentation collection area, and the sand pump is installed at the inlet of the conveying pipe.

[0014] Furthermore, a fine sand outlet is provided on the sedimentation separation box at the bottom of the fine sand sedimentation collection area, and the fine sand outlet is connected to the inlet of the conveying pipeline.

[0015] Furthermore, the outlet of the conveying pipeline is connected to the feed side of the sand washing machine or the next sand washing machine connected to the fine sand settling separator.

[0016] Furthermore, the sedimentation separation tank is equipped with a baffle to increase the flow channel of wastewater from the wastewater inlet to the wastewater outlet and / or a blocking device to reduce the kinetic energy of the wastewater flow.

[0017] Furthermore, there are multiple partitions, and the multiple partitions and the sedimentation separation box form a flow channel from the wastewater inlet to the wastewater outlet. The flow channel is located above the fine sand sedimentation collection area, and the bottom of the flow channel is connected to the fine sand sedimentation collection area.

[0018] Furthermore, the flow channel extends horizontally from the wastewater inlet to the wastewater outlet.

[0019] Furthermore, the multiple baffles are of the same height and are alternately staggered on the two opposite side walls of the sedimentation separation box to form a horizontal S-shaped reflux flow channel, with the wastewater inlet and wastewater outlet located at the two ends of the flow channel, respectively.

[0020] Furthermore, the flow channel extends vertically from the wastewater inlet to the wastewater outlet.

[0021] Furthermore, the multiple baffles are of different heights and are alternately staggered in the height direction of the sedimentation separation box to form a vertical S-shaped reflux flow channel. The wastewater inlet and wastewater outlet are located at the two ends of the flow channel, respectively.

[0022] Furthermore, the flow channel extends spirally in the horizontal direction from the wastewater inlet to the wastewater outlet.

[0023] Furthermore, the baffle is spiral-shaped, forming a spiral flow channel, with one of the wastewater inlet and wastewater outlet located at the center of the spiral flow channel and the other located outside the spiral flow channel.

[0024] Furthermore, the partition is a closed partition or a partially closed partition.

[0025] Furthermore, the blocking device is a grid or mesh, which is installed inside the settling separation box or the flow channel.

[0026] Furthermore, the blocking device includes a mounting plate located above the sedimentation separation tank. Multiple downward-extending water flow blocking rods are mounted on the mounting plate and inserted downward into the sedimentation separation tank or the flow channel.

[0027] Furthermore, the mounting plate has multiple mounting holes, the lower part of the water flow blocking rod passes vertically downward through the mounting holes, and the top of the water flow blocking rod is provided with a limiting part to prevent the water flow blocking rod from falling out of the mounting holes.

[0028] The blocking device is a grid or mesh, and the blocking device is installed in the sedimentation separation box or the flow channel.

[0029] The present invention has the following beneficial effects:

[0030] This invention proposes a fine sand settling separator for sand purification. When wastewater is introduced into the sand washing machine, the flow rate of the sand and water rapidly slows down, causing the kinetic energy of the wastewater containing fine sand to decrease quickly. The fine sand, with its high density, settles rapidly, while the water, with its lower density, continues to flow towards the outlet. This process allows for the settling and recovery of the fine sand discharged along with the wastewater from the sand washing machine. The recovered fine sand is returned to the sand washing machine, while the wastewater, free of fine sand, is discharged. This invention employs a natural settling method to separate the fine sand from the water, replacing the traditional mechanical dewatering method that relies on mechanical cyclone sand-water separation and strong dewatering with dewatering screens. This natural settling method significantly reduces power consumption.

[0031] The fine sand settling separator of this invention has a simple structure, small size, small installed capacity, low investment, convenient installation, and low operating cost. Therefore, this fine sand settling separator can be installed at the wastewater discharge outlet of each sand washing plant. Wastewater is introduced into the separator's housing, allowing fine sand to settle rapidly. Wastewater free of fine sand is discharged externally, while the settled fine sand is pumped into the current process and mixed with other medium and coarse sand before being sent to the next stage. This allows for the upgrading and transformation of existing sand washing plant wastewater treatment, solving the problem of large amounts of fine sand in the wastewater discharged from each stage of the sand purification process, and effectively preventing the loss of fine sand with wastewater discharge.

[0032] This invention also changes the existing technology that requires the unified collection of wastewater containing fine sand from each process, sand-water separation, and fine sand recycling method that sends the fine sand to the final process to mix with the finished sand. There is no need to set up a special fine sand centralized recycling system. The fine sand from each process enters the next process together with the coarse sand from the same process. The mixing uniformity of coarse and fine sand is good, and it also avoids the harmful substances and mud brought back by the existing fine sand centralized recycling. This ensures quality, reduces equipment investment, reduces investment, and lowers operating costs.

[0033] Compared to existing centralized fine sand recovery methods, the fine sand settling separator of this invention ensures that all sand particles receive the same level of cleaning, guaranteeing uniform cleanliness and quality. It also offers advantages such as lower investment, lower operating costs, simplicity, convenience, and fewer malfunctions. This is something that centralized fine sand collection and recovery methods cannot achieve, making it particularly significant in practice and valuable. Attached Figure Description

[0034] Figure 1 This is an axonometric view of an example of the fine sand settling separator of the present invention;

[0035] Figure 2 for Figure 1 A top-down view;

[0036] Figure 3 for Figure 2 The front view;

[0037] Figure 4 for Figure 1 A schematic diagram of another conveying pipeline and sand pump setup for a fine sand settling separator;

[0038] Figure 5 This is an axonometric view of another example of the fine sand settling separator of the present invention;

[0039] Figure 6 for Figure 5 Top view;

[0040] Figure 7 for Figure 6 A full sectional view taken from the front;

[0041] Figure 8 for Figure 5 A schematic diagram of another conveying pipeline and sand pump setup for a fine sand settling separator;

[0042] Figure 9 A front view of yet another example of the fine sand settling separator of the present invention;

[0043] Figure 10 for Figure 9 Top view;

[0044] Figure 11 for Figure 9 Axonometric view of the settling chamber of a fine sand settling separator;

[0045] Figure 12 for Figure 11 The front view;

[0046] Figure 13 for Figure 9 Axonometric view;

[0047] Figure 14 An example diagram of a barrier device;

[0048] Figure 15 The connection method between the fine sand settling separator and the spiral sand washer system;

[0049] Figure 16 This describes the connection method between the fine sand settling separator and the sand washing system of the wheel-type sand washing machine. Detailed Implementation

[0050] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0051] Observations and research have revealed that sand has a density of approximately 2.6 tons per cubic meter, while water has a density of 1 ton per cubic meter. This significant density difference, according to well-known principles, means that in a sand-water solution, the denser sand particles settle more easily, making separation of sand and water straightforward. The loss of fine sand is due to the intense vibrations in the sand washing machine during the washing process. Because of its small mass, the fine sand settles slowly in this vibrating environment and cannot settle effectively, resulting in its discharge along with the wastewater. This phenomenon is particularly pronounced when the water volume is large and the mud content is high (high mud content increases water viscosity). Further observation revealed that when the flow rate of the wastewater containing fine sand decreases to a certain level, the denser sand particles settle rapidly and do not flow with the wastewater.

[0052] Based on the above principles and the actual sand washing process, considering factors such as the sand-to-water ratio, wastewater discharge volume, mud content in the wastewater, wastewater viscosity, and the proportion of various particle sizes in the fine sand, this embodiment of the invention provides a fine sand settling separator 200, which can recover fine sand discharged with the wastewater from the sand washing machine during the purification process of sea sand, river sand, and manufactured sand. Figure 1-16 As shown, the system includes a settling separation tank 201, which is a shell structure with a closed bottom and sides and an open top. Its upper part can be a square, rectangular, circular, or other shaped box, while the lower part can be a conical structure composed of inclined plates. The settling separation tank 201 is equipped with a wastewater inlet 202 and a wastewater outlet 203. The wastewater inlet 202 of the fine sand settling separator 200 is used to connect to the wastewater discharge port of the sand washing machine. According to the flow direction of the wastewater within the settling separation tank 201, the wastewater inlet 202 is located at the front end of the settling separation tank 201, and the wastewater outlet 203 is located at the rear end of the settling separation tank 201. Generally, the height of the wastewater outlet 203 is lower than that of the wastewater inlet 202.

[0053] The lower part of the sedimentation separation box 201 is a fine sand sedimentation collection area 204, which is connected to a conveying pipe 206, and a sand pump 207 is installed on the conveying pipe 206.

[0054] During continuous sand washing, the wastewater discharged from the sand washing machine contains a significant amount of fine sand. To recover this fine sand, this invention includes a fine sand settling separator 200 in the sand washing machine. The wastewater containing fine sand discharged from the sand washing machine enters the settling and separation tank 201 through the wastewater inlet 202 of the fine sand settling separator 200.

[0055] When wastewater containing fine sand enters the settling separator 201 through the wastewater inlet 202, its velocity decreases, and the sand-water flows slowly towards the wastewater outlet 203. The velocity of the sand particles slows down, the settling velocity accelerates, and the fine sand settles to the bottom, achieving the settling and separation of fine sand. The wastewater continues to move towards the wastewater outlet 203, and finally, the wastewater without fine sand is discharged from the wastewater outlet 203. The settled fine sand falls into the fine sand settling collection area 204 at the bottom of the settling separator 201. Under the action of the sand pump, the fine sand is extracted and transported through the conveying pipe 206 to the feed side of the sand washing machine or a designated location.

[0056] During sand purification, multiple sand washing machines can be set up sequentially, with consecutive sand washing machines directly connected or connected through a feed channel. The discharge side of the preceding sand washing machine is connected to the feed side of the following sand washing machine. The sand washed by the preceding sand washing machine enters the following sand washing machine. Each sand washing machine with wastewater discharge can be equipped with at least one fine sand settling separator. The fine sand outlet of the fine sand settling separator is connected to the feed side of the sand washing machine connected to the fine sand settling separator (i.e., the current sand washing machine) or the next sand washing machine. The recovered fine sand enters the current sand washing machine for further washing, or enters the next sand washing machine, or is transported to a designated location.

[0057] Extensive research revealed that existing sand washing machines discharge wastewater containing a significant amount of fine sand, typically ranging from 5% to 30%. To recover this fine sand, professionals usually install a large, unified collection tank within the production line. Wastewater containing fine sand from each stage is discharged into this tank, which is equipped with a high-powered mud and sand pump. The mud and sand are then drawn into a hydrocyclone for sand-water separation. The resulting fine sand and mud with lower moisture content are sent to a dewatering screen, dewatered, and then mixed in the finished product storage area. This method involves significant investment and high operating costs.

[0058] This invention proposes a fine sand settling separator for sand purification. When wastewater is introduced into the sand washing machine, the flow rate of the sand and water rapidly slows down, causing the kinetic energy of the wastewater containing fine sand to decrease quickly. The fine sand, with its high density, settles rapidly, while the water, with its lower density, continues to flow towards the outlet. This process allows for the settling and recovery of the fine sand discharged along with the wastewater from the sand washing machine. The recovered fine sand is returned to the sand washing machine, while the wastewater, free of fine sand, is discharged. This invention employs a natural settling method to separate the fine sand from the water, replacing the traditional mechanical dewatering method that relies on mechanical cyclone sand-water separation and strong dewatering with dewatering screens. This natural settling method significantly reduces power consumption.

[0059] The fine sand settling separator of this invention has a simple structure, small size, small installed capacity, low investment, convenient installation, and low operating cost. Therefore, this fine sand settling separator can be installed at the wastewater discharge outlet of each sand washing plant. Wastewater is introduced into the separator's housing, allowing fine sand to settle rapidly. Wastewater free of fine sand is discharged externally, while the settled fine sand is pumped into the current process and mixed with other medium and coarse sand before being sent to the next stage. This allows for the upgrading and transformation of existing sand washing plant wastewater treatment, solving the problem of large amounts of fine sand in the wastewater discharged from each stage of the sand purification process, and effectively preventing the loss of fine sand with wastewater discharge.

[0060] This invention also changes the existing technology that requires the unified collection of wastewater containing fine sand from each process, sand-water separation, and fine sand recycling method that sends the fine sand to the final process to mix with the finished sand. There is no need to set up a special fine sand centralized recycling system. The fine sand from each process enters the next process together with the coarse sand from the same process. The mixing uniformity of coarse and fine sand is good, and it also avoids the harmful substances and mud brought back by the existing fine sand centralized recycling. This ensures quality, reduces equipment investment, reduces investment, and lowers operating costs.

[0061] Compared to existing centralized fine sand recovery methods, the fine sand settling separator of this invention ensures that all sand particles receive the same level of cleaning, guaranteeing uniform cleanliness and quality. It also offers advantages such as lower investment, lower operating costs, simplicity, convenience, and fewer malfunctions. This is something that centralized fine sand collection and recovery methods cannot achieve, making it particularly significant in practice and valuable.

[0062] This invention does not limit the arrangement of the conveying pipeline and the sand pump. For example, the sedimentation separation box 201 is a shell structure with a closed bottom and sides and an open top. The inlet of the conveying pipeline 206 extends directly downward from the open top of the shell structure into the fine sand sedimentation collection area 204. The sand pump 207 is installed at the inlet of the conveying pipeline 206. Figure 4 , 8 As shown.

[0063] For example, a fine sand outlet 205 is provided on the sedimentation separation box 201 at the bottom of the fine sand sedimentation collection area 204. The fine sand outlet 205 can be connected to the inlet of the conveying pipe 206 at the bottom of the sedimentation separation box 201.

[0064] The outlet of the conveying pipe 206 can be connected to the feed side of a sand washing machine (i.e., the current sand washing machine) connected to the fine sand settling separator or the next sand washing machine. The recovered fine sand enters the current sand washing machine for further washing or enters the next sand washing machine. The outlet of the conveying pipe 206 can also be connected to a designated location.

[0065] In some examples, the settling separation tank 201 may be a single tank without any other internal partitions. In other examples, to enhance the settling effect of fine sand and make the sand-water separation more thorough, the settling separation tank 201 is provided with a baffle 208 that increases the flow channel of wastewater from the wastewater inlet 202 to the wastewater outlet 203 and / or a barrier device 209 that reduces the kinetic energy of the wastewater flow.

[0066] Specifically, there are multiple baffles 208, which, together with the settling separation tank 201, form a flow channel 210 from the wastewater inlet to the wastewater outlet. This flow channel 210 has a tortuous, meandering, or spiraling structure to guide the orderly flow of wastewater and increase the length of the flow channel from the wastewater inlet 202 to the wastewater outlet 203. The flow channel 210 can increase the residence time of wastewater in the settling separation tank 201, which is beneficial to the settling and separation of fine sand and effectively improves the settling and separation effect of fine sand. The flow channel 210 is located above the fine sand settling collection area 204, and the bottom of the flow channel 210 is connected to the fine sand settling collection area 204 to ensure that the settled fine sand falls into the fine sand settling collection area 204.

[0067] The blocking device 209 can be a structure such as a grid or mesh, or various shapes of energy-blocking objects that can be movable or fixed. When the partition 208 is not included, the grid or mesh can be directly installed inside the sedimentation separation tank 201. When the partition 208 is included, the grid or mesh can be installed inside the flow channel 210. The blocking device 209 can increase the impact and obstruction of fine sand when wastewater flows. When moving sand particles encounter the blocking device 209, their kinetic energy is reduced sharply, which more effectively reduces the kinetic energy of the sand particles and accelerates the settling of the sand particles, thereby achieving the effect of accelerating sedimentation and separation.

[0068] The blocking device 209 may include a mounting plate 212 located above the sedimentation separation tank 201. Multiple downward-extending water flow blocking rods 213 are mounted on the mounting plate 212, and these rods are inserted downwards into the sedimentation separation tank 201 or the flow channel 210. Figure 14 As shown.

[0069] To facilitate the installation of the water flow blocking rod 213, the mounting plate 212 has multiple mounting holes 214, which can be arranged in multiple rows, with multiple rods per row. The lower part of the water flow blocking rod 213 passes vertically downward through the mounting holes 214 and is inserted into the sedimentation separation tank 201 or the flow channel 210. The top of the water flow blocking rod 213 is provided with a limiting part 215 to prevent the water flow blocking rod 213 from falling out of the mounting holes 214. The limiting part 215 can be a short rod that is perpendicular (i.e., horizontal) to the water flow blocking rod 213. The water flow blocking rod 213 is detachably connected to the mounting plate 212 through the mounting holes 214, and an appropriate number of water flow blocking rods 213 can be set as needed.

[0070] After the wastewater containing fine sand enters the settling and separation tank 201, its kinetic energy is reduced and its velocity is slowed down by the obstruction device 209. Since the density of sand particles is generally 2.6 tons / cubic meter and the density of water is 1 ton / cubic meter, the fine sand particles will quickly settle to the bottom under sufficiently low flow velocity. At the same time, the sand particles are also facilitated by the collision of the baffles and the obstruction of other obstructions during the movement of the wastewater from the inlet to the outlet. Finally, the wastewater without sand particles flows into the discharge outlet for external discharge, while the sand particles and some mud settle at the bottom and are transported by the sand pump to the sand washing machine in this channel. Together with other sand in this channel, they are sent to the next stage of the washing process. This achieves the goal of separating fine sand from wastewater, where the discharged wastewater does not contain fine sand, and the fine sand and other medium and coarse sand in this channel are sent to the next stage of the process.

[0071] In one example, the flow channel 210 extends horizontally from wastewater inlet 202 to wastewater outlet 203. Specifically, as... Figure 1-4 As shown, multiple baffles 208 are of the same height, and the multiple baffles 208 are alternately staggered in the direction (front-back direction or left-right direction) on the two opposite side walls of the sedimentation separation box 201 to form a horizontal S-shaped return flow channel 210, that is, it extends in a meandering direction in the horizontal direction. The wastewater inlet 202 and the wastewater outlet 203 are located at the two ends of the flow channel 210, respectively. Wastewater flows from the wastewater inlet 202 along the flow channel 210 to the wastewater outlet 203. The blocking device 209 is set in the flow channel 210.

[0072] In another example, the flow channel 210 extends spirally in the horizontal direction from wastewater inlet 202 to wastewater outlet 203. Specifically, as... Figure 5-8As shown, the partition 208 is spiral-shaped, forming a spiral flow channel 210 from the center outwards. The wastewater inlet 202 is located at the very center of the spiral flow channel 210, with wastewater entering from above. The wastewater outlet 203 is located at the outermost periphery of the spiral flow channel 210. The wastewater flows from the center of the tank through the spiral channel to the outside. A barrier device 209 is installed within the flow channel 210. Alternatively, the wastewater inlet 202 and wastewater outlet 203 can be interchanged, with the wastewater flowing from the side of the tank through the spiral channel to the central area, and then discharged externally through a conduit in the central area.

[0073] In another example, the flow channel 210 extends vertically from wastewater inlet 202 to wastewater outlet 203. Specifically, as... Figure 9-13 As shown, multiple baffles 208 have different heights and are alternately staggered in the height direction of the sedimentation separation tank 201. The upper parts of the baffles 208 are either above or below the liquid surface. When the first baffle is above the liquid surface, wastewater flows in from the inlet and then flows into the area behind the first baffle from the lower part of the first baffle. When the upper part of the second baffle is below the liquid surface, wastewater enters the area behind the second baffle from the upper part of the second baffle and then enters the area behind the third baffle from the lower part of the third baffle, and so on, forming a vertical S-shaped reflux flow channel that meanders vertically until the last area. The last area is provided with a wastewater outlet 203 on the side of the tank to discharge wastewater.

[0074] In this invention, the partition can be a closed partition or a partially closed partition, such as a grid, mesh, or other partially closed plate. Its height is not limited and can be set arbitrarily.

[0075] The bottom of the sedimentation separation box 201 can also be provided with a bottom cleaning port 211 for easy cleaning and maintenance.

[0076] To make the connection of this fine sand settling separator in the sand washing system more intuitive and clear, two demonstration examples are provided.

[0077] Example 1: A connection method for a sand washing system consisting of a fine sand settling separator 200 and a spiral sand washer 100. The wastewater inlet 202 of the fine sand settling separator 200 is connected to the wastewater outlet of the spiral sand washer 100. The outlet of the conveying pipe 206 of the fine sand settling separator 200 is connected to the outlet section of the spiral sand washer 100 at a suitable position. The fine sand and other sand from this spiral sand washer are mixed and enter the next spiral sand washer, such as... Figure 15 As shown.

[0078] Example 2: Connection method of the sand washing system between the fine sand settling separator 200 and the wheel bucket sand washer 300. The wastewater inlet 202 of the fine sand settling separator 200 is connected to the wastewater outlet of the wheel bucket sand washer 300, and the outlet of the conveying pipe 206 of the fine sand settling separator 200 is connected to the discharge port (or the feed port) of the wheel bucket sand washer. The fine sand enters the next stage or enters the current wheel bucket sand washer for further washing. Figure 16 As shown, fine sand enters the current bucket wheel sand washing machine for another wash. Although this increases the amount of fine sand discharged from the wastewater of the current bucket wheel sand washing machine, in reality, some fine sand and other fine sand from the current bucket wheel sand washing machine will enter the next bucket wheel sand washing machine. In the actual washing process, not all fine sand is discharged with the wastewater. Instead, some is discharged with the wastewater, and some enters the next bucket wheel sand washing machine together with medium and coarse sand.

[0079] Based on the above principles, the connection methods between the fine sand settling separator and various sand washing machines can be different, and technicians can make adjustments as needed. All different adjustments should still fall within the protection scope of this invention.

[0080] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A sand washing device, characterized in that, The system includes multiple sand washing machines arranged sequentially, with each sand washing machine directly connected to the previous one or connected via a feeding channel. The discharge side of the previous sand washing machine is connected to the feed side of the next sand washing machine, and the sand washed by the previous sand washing machine enters the next sand washing machine. It also includes a fine sand settling separator. Each sand washing machine with wastewater discharge is equipped with at least one fine sand settling separator. The fine sand settling separator includes a settling and separation box, which has a wastewater inlet and a wastewater outlet. The wastewater inlet of the fine sand settling separator is connected to the wastewater discharge outlet of the sand washing machine. The lower part of the settling and separation box is a fine sand settling and collection area, which is connected to a conveying pipe equipped with a sand pump. The outlet of the conveying pipeline is connected to the feed side of the sand washing machine or the next sand washing machine connected to the fine sand settling separator. The sedimentation separation tank is equipped with a baffle that increases the flow channel of wastewater from the wastewater inlet to the wastewater outlet and a blocking device that reduces the kinetic energy of the wastewater flow. The blocking device is installed inside the flow channel. The number of baffles is multiple, and the multiple baffles and the sedimentation separation box form a flow channel from the wastewater inlet to the wastewater outlet. The flow channel is located above the fine sand sedimentation collection area, and the bottom of the flow channel is connected to the fine sand sedimentation collection area. The blocking device includes a mounting plate located above the sedimentation separation tank. Multiple downward-extending water flow blocking rods are mounted on the mounting plate and inserted downward into the flow channel.

2. The sand washing equipment according to claim 1, characterized in that, The sedimentation separation box is a shell structure that is closed at the bottom and all four sides and open at the top. The inlet of the conveying pipe extends downward from the opening at the top of the shell structure into the fine sand sedimentation collection area. The sand pump is installed at the inlet of the conveying pipe.

3. The sand washing equipment according to claim 1, characterized in that, The sedimentation separation box at the bottom of the fine sand sedimentation collection area is equipped with a fine sand outlet, which is connected to the inlet of the conveying pipeline.

4. The sand washing equipment according to claim 1, characterized in that, The flow channel extends horizontally from the wastewater inlet to the wastewater outlet.

5. The sand washing equipment according to claim 4, characterized in that, Multiple baffles are of the same height and are alternately staggered on the two opposite side walls of the sedimentation separation tank to form a horizontal S-shaped reflux flow channel. The wastewater inlet and wastewater outlet are located at the two ends of the flow channel, respectively.

6. The sand washing equipment according to claim 1, characterized in that, The flow channel extends vertically from the wastewater inlet to the wastewater outlet.

7. The sand washing equipment according to claim 6, characterized in that, Multiple baffles of different heights are alternately staggered along the height of the sedimentation separation tank to form a vertical S-shaped reflux flow channel. The wastewater inlet and wastewater outlet are located at opposite ends of the flow channel.

8. The sand washing equipment according to claim 1, characterized in that, The flow channel extends in a spiral direction from the wastewater inlet to the wastewater outlet.

9. The sand washing equipment according to claim 8, characterized in that, The baffle is spiral-shaped, forming a spiral flow channel. One of the wastewater inlet and the wastewater outlet is located at the center of the spiral flow channel, and the other is located outside the spiral flow channel.

10. The sand washing equipment according to claim 1, characterized in that, The partition is either a closed partition or a partially closed partition.

11. The sand washing equipment according to claim 1, characterized in that, The mounting plate has multiple mounting holes. The lower part of the water flow blocking rod passes vertically downward through the mounting holes, and the top of the water flow blocking rod is provided with a limiting part to prevent the water flow blocking rod from falling out of the mounting holes.

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