CN106698889A - Building mud dewatering method and device - Google Patents

Abstract

The invention discloses a building mud dewatering method and device. The device comprises a mud sand separating machine (1), a full-automatic stirring device (2), a dynamic mixer (3), a sand washer (4), a mud tank (5), at least one filter press (6) and a plunger pump (7). The device is adopted to execute the building mud dewatering method, integrates a sand separating platform and a dewatering platform, achieves automatic operation of mud sand separation, sand washing and dewatering and makes mud separation and purification become quick and efficient, and accordingly the purpose of mud pollution is thoroughly solved.

Description

Method and device for dehydrating construction mud

technical field

The invention relates to the field of filtration system devices, in particular to a construction mud dehydration method and device.

Background technique

With the acceleration of urban construction and the rapid development of industry, a large number of roads, bridges and pile foundations will produce mud mainly composed of cement and clay. People gradually have a deep understanding of the environmental pollution caused by construction waste mud and the negative impact on engineering construction. Its specific manifestations are: waste slurry causes deterioration of the construction environment, increases construction difficulty, affects construction progress, may cause blockage of sewage pipes, and waste water accumulates and infiltrates into the ground for a long time, causing groundwater or river pollution. As the amount of mud treatment increases, it is difficult to find a place for stacking and dumping the generated mud. Some business units will secretly dump the mud directly into rivers, ponds, sewers, land, etc., which not only silts the river, pollutes the land, but also may cause The pollution of groundwater seriously affects the life and health of residents. "It only takes 3 minutes to dump a truckload of mud into the rainwater pipe, but the time and cost for cleaning up is dozens of times higher, causing a serious waste of social resources."

According to relevant national laws, regulations and policies, the treatment and disposal of mud should follow the principles of "reduction, harmlessness, and resource utilization". Existing companies have also adopted solutions for mud dehydration, such as [Application No.: 201110330079.0] a construction mud sand separation and concentration dehydration system. The technical solution adopted in this invention is: a construction mud separation and sand concentration dehydration system. It consists of a belt desander, a buffer tank corresponding to the belt desander, a pretreatment device connected to the buffer tank, a belt concentration dehydration device connected to the pretreatment device, and clean water recovery connected to the buffer tank and the belt concentration dehydration device respectively. device, filter belt cleaning device and control system, and the belt-type concentration and dehydration device is connected with the buffer tank. Although this technology can solve the mud dehydration treatment, the processing capacity of the processing equipment used is small, the equipment failure is high, and the processing efficiency is not high.

Contents of the invention

In order to solve the above problems, the object of the present invention proposes a construction mud dehydration method and device.

In order to achieve this purpose, the present invention adopts the following technical solutions.

A construction mud dehydration device, comprising a mud separator, a fully automatic stirring device, a dynamic mixer, a sand washing machine, a mud tank, a filter press and a plunger pump;

The feed inlet of the mud sand separator is connected to the mud inlet pipeline, and a vertical slurry pump is arranged on the mud inlet pipeline, and the sand outlet of the mud sand separator is connected with the feed end of the sand washing machine; The discharge end of the mud sand separator is connected to the dynamic mixer through a pipeline, and a pipeline pump is arranged on the pipeline; the fully automatic stirring device is arranged on one side of the dynamic mixer, and the fully automatic stirring device and the dynamic mixer pass through Pipeline connection, one side of the fully automatic stirring device is provided with a mud tank, plunger pump and filter press in sequence, the discharge end of the dynamic mixer is connected with the mud tank; the mud tank is connected with the plunger pump inlet, and the column The discharge port of the plug pump is connected with the feed port of the filter press; the mud tank can be replaced by a mud pool;

Further, the fully automatic stirring device includes a barrel body, a stirring motor, a stirring shaft, a feeding device, a return pipeline, a discharge port and a feed port;

The stirring shaft is arranged on the center line of the barrel body, the upper end of the stirring shaft is connected with the output shaft end of the stirring motor through a coupling, the middle and lower part of the stirring shaft is a hollow structure, and the The hollow structure is provided with evenly distributed strip-shaped holes;

The outer surface of the stirring shaft is provided with an integrally formed helical blade, the surface of the helical blade is a curved surface, and the inner surface of the blade is provided with a support frame;

The feed inlet is arranged above the barrel, the outlet is arranged below the barrel, and the outlet is provided with a knob switch;

One end of the return pipe is arranged at the bottom of the barrel, and the other end of the return pipe is arranged at the upper part of the barrel;

The feeding device is arranged on the upper part of the barrel, and the feeding device includes a feeding box and a feeding pipeline;

The feeding box is arranged on the upper part of the barrel and is positioned at one side of the stirring motor, the bottom of the feeding box is provided with a through hole, one end of the feeding pipeline is arranged in the through hole, and the feeding pipeline The other end is connected to the hollow structure of the stirring shaft.

Further, the mud separator includes a frame, a screen box, a transfer box, a float device, a storage box, a cyclone, a pipeline pump and a slurry pump;

The transfer box is arranged at the bottom of the frame, the screen box is arranged at the upper part of the transfer box, the outlet of the screen box is provided with a slag discharge port, and one end of the transfer box is provided with the slurry pump, the slurry outlet end of the slurry pump is connected to one end of the cyclone, and the cyclone is connected to the inside of the storage tank through a pipeline, and the storage tank is provided with a first branch pipeline and a second branch pipeline pipeline, the first branch pipeline communicates with the float device, and the second branch pipeline communicates with the pipeline pump;

The floating ball device is mainly used to replenish the slurry in the transfer tank, so that the liquid level can be kept at a certain height, avoiding the lack of slurry and causing the slurry pump to evacuate and frequently start and stop, prolong the service life of the pump, and improve work efficiency.

Further, the sand washing machine is a wheel-bucket sand washing machine, and the sand washing machine includes a sand washing box, an impeller, a flywheel and a motor;

The impeller is set in the sand washing box and partially exposed on the upper part of the sand washing box, and the impeller does not contact the bottom of the sand washing box; the flywheel is fixed inside the impeller and rotates coaxially with the impeller, and the motor is located on One side of the flywheel, the output end of the motor is connected with the flywheel through a transmission belt and rotates synchronously.

Further, the dynamic mixer includes a driving motor, a mandrel, a delivery pipe mixer frame, a stirring blade, a feed pipe and a discharge pipe;

The driving motor and the conveying pipe are arranged on the mixer frame, the mandrel is arranged through the conveying pipe, the driving motor drives the mandrel to rotate, and the two ends of the conveying pipe are respectively provided with The feed pipe and the discharge pipe, the feed pipe is connected with the discharge end of the automatic stirring device and the discharge end of the mud sand separator through pipelines, and the feed pipe is connected with the discharge end of the mud sand separator. A pipeline pump is provided on the pipeline, and a screw pump or a screw pump is provided on the pipeline at the discharge end of the feed pipe and the fully automatic stirring device; the discharge pipe communicates with the mud tank.

Further, an online flow-density detection system is also provided. The online flow-density detection system includes a flow-density meter and a PLC control system. Between the pipes connected to the mixer, the flow-density meter is connected with the PLC control system.

Further, there is at least one filter press, and the feed port of the filter press communicates with the discharge port of the plunger pump.

A kind of construction mud dehydration method based on the device described in any one of the above, comprising steps as follows:

(1) Pass the waste slurry generated in the construction mud construction into the inlet of the mud separator through the pipeline;

The mud separator uses the vibrating motor installed on the screen box at an angle of 45° to the horizontal screen surface as the vibration source. The excitation forces in the direction of the axis of the vibration motor cancel each other out, and the excitation forces in the direction perpendicular to the axis of the vibration motor are superimposed into a resultant force and transmitted to the entire screen surface, so that the materials on the screen surface move toward the discharge port. The material smaller than the sieve hole falls to the lower layer through the sieve hole, and flows out through the discharge port after continuous jumping. Due to the reasonable screening process, the purpose of screening and grading the material through the mud sand separator can be achieved. ; The moisture content of the sand after being processed by the mud sand separator is ≤30%, which can be directly transported abroad;

(2) Send the sand screened by the mud sand separator directly into the wheel bucket sand washing machine; at the same time, pass the mud screened by the mud sand separator into the mud sand separator and dynamic mixer through the pipeline pump of the connected pipe;

When the sand washing machine is working, the motor drives the flywheel to rotate through the transmission belt, and the flywheel drives the impeller to rotate, and then the sand and stone roll under the drive of the impeller and grind each other to remove impurities covering the surface of the sand and stone, and at the same time destroy the coated sand. To facilitate dehydration, add water when the impeller is working to form a strong water flow, take away impurities and foreign objects with small specific gravity in time, and finally complete the cleaning work;

(3) Use the online flow-density detector to detect the mud in the pipeline connecting the mud sand separator and the dynamic mixer;

(4) According to the on-line detection of the mud, the chemical agent stirred by the automatic stirring device is sent to the feed pipe of the dynamic mixer;

The fully automatic stirring device uses the cycloidal needle as the driving force to drive the stirring blades to fully mix and stir the PAM and water; in addition, a screw pump is set, which is used to send the medicinal liquid and to return the impact medicinal liquid, so that The water flow in the barrel is in a turbulent state, which intensifies the mixing effect of the liquid in the barrel, improves the dissolution and diffusion level of the solid drug, saves stirring time, speeds up the dissolution rate of the drug, and achieves the effect of rapid dissolution. The stirring time is 15-30 minutes;

(5) After the dynamic mixer mixes, stirs and flocculates the mud and chemicals, it is transported to the mud tank through the discharge pipe of the dynamic mixer;

When working, the driving motor in the dynamic mixer provides power to increase the mixing degree. By setting the stirring blades in the conveying pipe, the medicine in the mixer can be continuously and evenly contacted with the sludge particles, which effectively increases the interaction between the medicine particles and the colloidal particles. Bridging and adsorption can fully improve the mixing and flocculation effect; at the same time, the dynamic mixer can give full play to its advantages in the equipment with limited pipeline length, the mixing and flocculation effect is good, the length of the flocculation mixing tube can be shortened, the mixing reaction can be accelerated, and the flocculation can be improved. efficiency;

(6) Use a plunger pump to pump the flocculated mud from the mud tank to the filter press for dehydration;

(7) The mud cake after the filter press is sent to the outside of the mud tank through the conveyor, and the filtered water is used for construction reuse or cleaning equipment.

Furthermore, in step (2), the sand washed by the wheel bucket sand washing machine can be directly transferred to the market for sale.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

The invention provides a construction mud dehydration method and device. The device is simple in structure and ingenious in design. It integrates the sand separation and sand washing platform and the dehydration platform, and can realize the automatic operation of the sand separation, sand washing and dehydration of the mud, making the separation and purification of the sludge more rapid and efficient. So as to completely solve the problem of mud pollution.

Description of drawings

Fig. 1 is based on the flow chart of a kind of construction mud dewatering device construction mud dehydration of the present invention;

Fig. 2 is the structural representation of a kind of construction mud dewatering device of the present invention;

Fig. 3 is the structural representation of the automatic stirring device in a kind of construction mud dewatering device of the present invention;

Fig. 4 is the structural representation of the mud separator in a kind of construction mud dewatering device of the present invention;

Fig. 5 is the structural representation of the mud separator in a kind of construction mud dewatering device of the present invention;

Fig. 6 is the structural representation of the sand washing machine of a kind of construction mud dewatering device of the present invention;

Fig. 7 is a structural schematic diagram of a dynamic mixer of a construction mud dehydration device according to the present invention.

detailed description

The present invention will be further described below in conjunction with specific embodiments and accompanying drawings, but the present invention is not limited to the following embodiments.

The structure schematic diagram of a kind of building mud dewatering device of the present invention is as shown in Figure 2, comprises mud separator 1, automatic stirring device 2, dynamic mixer 3, sand washing machine 4, mud tank 5, filter press 6 and column plug pump 7;

The feed port of the mud sand separator 1 is connected to the mud inlet pipeline, and the mud inlet pipeline is provided with a vertical slurry pump, and the sand outlet of the mud sand separator 1 is connected to the feed end of the sand washing machine 4. Connected; the discharge end of the mud separator 1 is connected to the dynamic mixer 3 through a pipeline, and a pipeline pump is arranged on the pipeline; the fully automatic stirring device 2 is arranged on one side of the dynamic mixer 3, and the fully automatic Stirring device 2 is connected with dynamic mixer 3 by pipeline, and one side of described automatic stirring device 2 is provided with mud tank 5, plunger pump 7 and filter press 6 successively, and the discharging end of dynamic mixer is connected with mud tank 5 connection; the mud tank 5 is connected to the plunger pump 7 feed port, and the plunger pump 7 discharge port is connected to the filter press 6 feed port; the mud tank 5 can be replaced by a mud pool;

Described full-automatic stirring device 2 as shown in Figure 3, comprises barrel body 21, stirring motor 22, stirring shaft 23, feeding device 24, backflow pipeline 25, discharge port 26 and feed inlet 27; Described stirring shaft 23 is provided with On the center line of the barrel body 21, the upper end of the stirring shaft 23 is connected with the output shaft end of the stirring motor 22 through a coupling, the middle and lower part of the stirring shaft 23 is a hollow structure, and the stirring shaft 23 The hollow structure is provided with uniformly distributed elongated holes; the outer surface of the stirring shaft 23 is provided with an integrally formed helical blade 231, the surface of the helical blade 231 is a curved surface, and the inner surface of the helical blade 231 The side is provided with a support frame 232; the feed port 27 is located above the barrel body 21, the discharge port 26 is located below the barrel body 21, and the discharge port 26 is provided with a knob switch; the return pipe One end of 25 is arranged on the bottom of barrel body 21, and the other end of described return pipeline 25 is arranged on the top of barrel body 21; Described charging device 24 is arranged on the top of barrel body 21, and described charging device 24 comprises charging box 241 and Feeding pipeline 242; described feeding box 241 is arranged on the top of staving 21 and is positioned at the side of described stirring motor 22, and the bottom of described charging box 241 is provided with through hole, and one end of described feeding pipeline 242 is located at described In the through hole, the other end of the feeding pipeline 242 is connected to the hollow structure of the stirring shaft 23;

The mud separator 1 shown in Figure 4 and Figure 5 includes a frame 11, a screen box 12, a transfer box 13, a float device, a storage box 14, a cyclone 15, a pipeline pump and a slurry pump; The transfer box 13 is located at the bottom of the frame 11, the screen box 12 is located at the top of the transfer box 13, and the outlet of the screen box 12 is provided with a gravel discharge port, and the transfer box 13 One end of the slurry pump is provided with the slurry pump, and the slurry discharge end of the slurry pump is connected to one end of the cyclone 15, and the cyclone 15 is connected to the inside of the storage tank 14 through a pipeline, and the storage The tank 14 is provided with a first branch pipeline and a second branch pipeline, the first branch pipeline communicates with the float device, and the second branch pipeline communicates with the pipeline pump;

Described sand washing machine 4 is wheel bucket type sand washing machine, as shown in Figure 6, described sand washing machine 4 comprises sand washing box 41, impeller 42, flywheel 43 and motor; Described impeller 42 is located at sand washing box 41 Inside and partially exposed on the top of the sand washing box 41, and the impeller 42 is not in contact with the bottom of the sand washing box 41; the flywheel 43 is fixed inside the impeller 42 and rotates coaxially with the impeller 42, and the motor is located at One side of the flywheel 43, the output end of the motor is connected with the flywheel 43 by a transmission belt and rotates synchronously;

Described dynamic mixer 3 as shown in Figure 7, comprises drive motor 31, mandrel 32, delivery pipe 33 and mixer frame 34, stirring blade, feed pipe 35 and discharge pipe 36; Described drive motor 31 and The conveying pipe 33 is arranged on the mixer frame 34, the mandrel 32 is arranged through the conveying pipe 33, the driving motor 31 drives the mandrel 32 to rotate, and the two ends of the conveying pipe 33 are respectively provided with vertical In the feed pipe 35 and the discharge pipe 36 of the delivery pipe 33, the feed pipe 35 communicates with the discharge end of the fully automatic stirring device 2 and the discharge end of the mud sand separator 1 through a pipeline, and the feed pipe 35 and the pipeline at the discharge end of the mud separator 1 are provided with a pipeline pump, and the pipeline at the discharge end of the feed pipe 35 and the fully automatic stirring device 2 is provided with a screw pump or a diaphragm pump; the discharge pipe 36 Connected with the mud tank 5;

An on-line flow-density detection system is also provided, and the on-line flow-density detection system includes a flow-density meter and a PLC control system, and the flow-density meter is arranged on the pipeline pump and the dynamic mixer at the discharge end of the slurry sand separator 1 3 between the connected pipelines, the flow-density meter is connected with the PLC control system;

At least one filter press 6 is provided, and the filter chamber of the filter press 6 communicates with the discharge port of the plunger pump 7 .

Example 1

Adopt above-mentioned device to carry out the flow schematic diagram of the dehydration of construction mud as shown in Figure 1, comprise the following steps:

(1) Pass the waste slurry generated in the construction mud construction into the inlet of the mud separator 1 through the pipeline;

(2) Send the sand screened by the mud sand separator 1 directly into the wheel bucket sand washing machine; at the same time, pass the mud screened by the mud sand separator 1 into the mud sand separator 1 and the mud sand separator 1 through the pipeline pump In the pipeline connected to the dynamic mixer 3;

(3) Use an online flow-density detector to detect online the mud in the pipeline connecting the mud separator 1 and the dynamic mixer 3;

(4) According to the on-line detection of the mud, the chemical agent stirred by the automatic stirring device 2 is sent to the feed pipe 35 of the dynamic mixer 3;

(5) After the dynamic mixer 3 mixes, stirs and flocculates the mud and chemicals, it is transported to the mud tank 5 through the discharge pipe 36 of the dynamic mixer 3;

(6) Use the plunger pump 7 to pump the flocculated mud from the mud tank 5 to the filter press 6 for dehydration treatment;

(7) The mud cake filtered by the filter press 6 is sent to the outside of the filter press 5 through the conveyor, and the filtered water is used for construction reuse or cleaning equipment.

The above describes the technical principles of the present invention in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present invention, and cannot be construed as limiting the protection scope of the present invention in any way. Based on the explanations herein, those skilled in the art can think of other specific implementation modes of the present invention without creative efforts, and these modes will all fall within the protection scope of the present invention.

Claims (9)

1. A construction mud dehydration device, characterized in that it includes a mud separator (1), a fully automatic stirring device (2), a dynamic mixer (3), a sand washing machine (4), a mud tank (5), filter press (6) and plunger pump (7); The feed inlet of the mud sand separator (1) is connected to the mud inlet pipeline, and a vertical slurry pump is arranged on the mud inlet pipeline, and the sand outlet of the mud sand separator (1) is connected to the sand washing machine ( 4) is connected to the feed end; the discharge end of the mud separator (1) is connected to the dynamic mixer (3) through a pipeline, and a pipeline pump is installed on the pipeline; the fully automatic stirring device (2) is located at On one side of the dynamic mixer (3), the fully automatic stirring device (2) is connected to the dynamic mixer (3) through a pipeline, and one side of the fully automatic stirring device (2) is sequentially provided with a mud tank (5) , plunger pump (7) and filter press (6), the discharge end of the dynamic mixer (3) is connected to the mud tank (5); the mud tank (5) is connected to the feed port of the plunger pump (7), The outlet of the plunger pump (7) is connected to the inlet of the filter press (6); the mud tank (5) can be replaced by a mud pool. 2. A construction mud dehydration device according to claim 1, characterized in that the fully automatic stirring device comprises a barrel body (21), a stirring motor (22), a stirring shaft (23), and a feeding device (24) , return pipe (25), discharge port (26) and feed port (27); The stirring shaft (23) is arranged on the center line of the barrel body (21), the upper end of the stirring shaft (23) is connected to the output shaft end of the stirring motor (22) through a coupling, and the stirring shaft The middle and lower part of (23) is a hollow structure, and the hollow structure of the stirring shaft (23) is provided with uniformly distributed elongated holes; The outer surface of the stirring shaft (23) is provided with an integrally formed helical blade (231), the surface of the helical blade (231) is a curved surface, and the inner surface of the helical blade (231) is provided with a support frame(232); The material inlet (27) is set above the barrel body (21), the material outlet (26) is set below the barrel body (21), and the material outlet (26) is provided with a knob switch; One end of the return pipe (25) is arranged at the bottom of the barrel (21), and the other end of the return pipe (25) is arranged at the upper part of the barrel (21); The feeding device (24) is arranged on the upper part of the barrel body (21), and the feeding device (24) includes a feeding box (241) and a feeding pipeline (242); The feeding box (241) is arranged on the upper part of the barrel body (21) and is located on one side of the stirring motor (22), the bottom of the feeding box (241) is provided with a through hole, and the feeding pipe (242) One end of the feeding pipe (242) is connected to the hollow structure of the stirring shaft (23). 3. A construction mud dehydration device according to claim 1, characterized in that the mud sand separator (1) includes a frame (11), a screen box (12), a transfer box (13), a floating ball device, storage tank (14), cyclone (15), slurry pump and pipeline pump; The transfer box (13) is set at the bottom of the frame (11), the screen box (12) is set at the upper part of the transfer box (13), and the outlet of the screen box (12) is provided with a gravel bottom One end of the transfer box (13) is provided with the slurry pump, and the slurry discharge end of the slurry pump is connected to one end of the cyclone (15), and the cyclone (15) overflows The outlet is connected to the inside of the material storage box (14) through a pipeline, and the material storage box (14) is provided with a first branch pipeline and a second branch pipeline, and the first branch pipeline communicates with the floating ball device, so The second branch pipeline communicates with the pipeline pump. 4. A construction mud dehydration device according to claim 1, characterized in that, the sand washing machine (4) is a wheel-bucket sand washing machine, and the sand washing machine (4) includes a sand washing box (41 ), impeller (42), flywheel (43) and motor; The impeller (42) is set in the sand washing box (41) and partially exposed on the upper part of the sand washing box (41), and the impeller (42) does not contact the bottom of the sand washing box (41); the flywheel (43 ) is fixed inside the impeller (42) and rotates coaxially with the impeller (42), the motor is located on one side of the flywheel (43), and the output end of the motor is connected to the flywheel (43) through a transmission belt and rotates synchronously . 5. A construction mud dehydration device according to claim 1, characterized in that the dynamic mixer (3) includes a drive motor (31), a spindle (32), a delivery pipe (33), a mixer machine frame (34), stirring blades, feed pipe (35) and discharge pipe (36); The driving motor (31) and the conveying pipe (33) are arranged on the mixer frame (34), the mandrel (32) is arranged through the conveying pipe (33), and the driving motor (31) drives the The mandrel (32) rotates, and the two ends of the delivery pipe (33) are respectively provided with a feed pipe (35) and a discharge pipe (36) perpendicular to the delivery pipe (33), and the feed pipe (35 ) is connected with the discharge end of the automatic stirring device (2) and the discharge end of the mud sand separator (1) through a pipeline, and the feed pipe (35) is connected with the pipeline of the discharge end of the mud sand separator (1) A pipeline pump is provided on the feed pipe (35) and a screw pump or a screw pump is provided on the pipeline at the discharge end of the fully automatic stirring device (2); the discharge pipe (36) and the mud tank (5) connected. 6. A kind of construction mud dewatering device according to claim 1, is characterized in that, is also provided with on-line flow-density detection system, and described on-line flow-density detection system comprises flow-density meter and PLC control system, described The flow-density meter is arranged between the pipeline pump at the discharge end of the mud separator (1) and the pipeline connected to the dynamic mixer (3), and the flow-density meter is connected to the PLC control system. 7. A construction mud dehydration device according to claim 1, characterized in that at least one filter press (6) is provided, and the inlet of the filter press is connected to the plunger pump (7) The outlet is connected. 8. based on the construction mud dewatering method of device described in any one in claim 1-7, it is characterized in that, comprises steps as follows: (1) Pass the waste slurry generated in the construction mud construction into the inlet of the mud sand separator (1) through the pipeline; (2) Send the sand screened by the mud sand separator (1) directly into the wheel bucket sand washing machine; at the same time, pass the mud screened by the mud sand separator (1) into the mud separator through a pipeline pump. The middle of the pipe connecting the sand machine (1) and the dynamic mixer (3); (3) Use the online flow-density detector to detect the mud in the pipeline connected to the mud separator (1) and the dynamic mixer (3); (4) According to the on-line detection of the mud, the chemical agent stirred by the automatic stirring device (2) is sent to the feed pipe (35) of the dynamic mixer (3); (5) After the dynamic mixer (3) mixes, stirs and flocculates the mud and chemicals, it is delivered to the mud tank (5) through the discharge pipe (36) of the dynamic mixer (3); (6) Use the plunger pump (7) to pump the flocculated mud from the mud tank (5) to the filter press (6) for dehydration; (7) Filter press (6) The filtered mud cake is sent to the outside of the filter press through the conveyor, and the filtered water is used for construction reuse or cleaning equipment. 9. A construction mud dehydration method according to claim 8, characterized in that, in step (2), the sand washed by the bucket wheel sand washing machine can be directly transferred to the market for sale.