CN111268821A - Fine treatment method for slurry for clay production from building spoil - Google Patents

Abstract

The invention relates to a fine treatment method of slurry for producing clay from building spoil, which comprises the following steps: settling part of sand with a large specific gravity in the original silt mixture by using a settling pond to obtain a fine sand-slurry mixture; and (3) precipitation treatment: precipitating part of fine sand with high specific gravity in the fine sand slurry mixture through an inclined sand-mud separation pipeline to obtain a slurry mixture; screening treatment: screening the slurry mixture in a high-pressure separation tank to obtain slurry water; vibration treatment: depositing at least part of the remaining fine sand in the slurry water at the bottom of the vibration pool through vibration treatment; and (3) flocculation collection: and sending the slurry dispersion liquid at the upper part of the vibrating tank into a clay settling tank, adding a quick flocculation precipitator to enable the slurry dispersion liquid to be divided into clay slurry at a lower layer and clear water at an upper layer, and collecting the clay slurry. The process realizes the high-efficiency production of the high-quality clay.

Description

A kind of mud fine treatment method for producing clay from construction spoil

technical field

The invention relates to a process for producing clay from construction spoil, in particular to a method for refining mud for producing clay from construction spoil.

technical background

As my country's economic scale development has become more and more important in the world, it has played a pivotal role in global economic development. my country's urbanization rate is getting faster and faster, and the proportion of urbanization is also getting higher and higher. This is mainly reflected in the increasing number of buildings in the city, and the development scale of underground space is also increasing day by day. However, there is an increasing amount of construction waste, not only from the renovation or demolition of old buildings, but also from newly constructed buildings that directly discard excess intermediate materials. In order to better realize the comprehensive management of the city and the comprehensive utilization of resources, the recycling of construction waste has become a national advocacy, public demand, and a necessary concept for sustainable development. The reuse of construction waste has spawned and promoted the development of related industries. While building resource recycling, it also promotes a positive social and economic cycle.

Construction spoil is one of the common construction wastes, which can be used for various purposes after treatment, such as green belt plant soil that can be used for beautifying the environment, used to fill in soil erosion, and partially maintain the ecological environment for re-production. Raw materials for building materials, etc. According to different uses, the construction spoil will be processed differently, usually including the removal of impurities, crushing into the required particle size, separation and collection of target substances and other processing steps. The use of construction spoil actually determines the disposal method adopted by the relevant industry personnel.

At present, in the process of using construction spoil to produce clay, usually only the larger sand and gravel in the mud-sand mixture are removed, and the fine sand in the mud is often not removed. Because, the clay prepared by using construction spoil as raw material is generally considered to be the "scraps" in it that cannot be treated "cleanly" due to the use of waste materials, and its market value cannot be compared with the clay obtained by normal raw materials or normal methods. However, the sources of construction spoil are not all from abandoned buildings, but also the waste intermediate materials in newly constructed buildings. After fine processing, construction spoil can produce high-quality clay, which is not functionally similar to normal raw materials. There is a substantial gap between the clay prepared by the normal method or the normal method, and the sources of construction spoil are more and more extensive, and the normal raw materials or clay mining resources are relatively less and less, so that the economic gap between different raw materials is difficult to ignore. At the same time, with the speed of urbanization, the demand for high-quality clay is also increasing. Therefore, more and more companies that use construction spoil to produce clay have begun to enter the market of high-quality clay. At present, in the process of using construction spoil to produce clay, the method of separating mud and sand is mainly to use physical precipitation method. Through mud pump and long inclined pipe at one end, the sedimentation speed of sand is faster than that of soil. The mud liquid and sand are separated, or the mud liquid and the sand are separated by using a hydrocyclone by using different centrifugal forces of substances with different specific gravity. The above method is suitable for continuous production and very economical, and can remove most of the coarse sand. It is inevitable that some fine sand will enter the next step with the mud, and the precipitation method mainly depends on the specific gravity of the material. Some sands have large particle size and light specific gravity due to various reasons and cannot be effectively separated, which will eventually affect the clay. quality. The screening technology can well separate the mud and sand in terms of particle size, but the use of a large-aperture mesh screen is inefficient for removing fine sand particles, and the use of a smaller-aperture mesh screen is more costly, and the rate of production separation is low. Screens are often clogged with small particles. Due to the requirements of comprehensive production efficiency and high-quality clay, the refinement of mud used for the production of clay from construction spoil still needs research and improvement, so that production enterprises can efficiently produce high-quality clay.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problems, the present invention proposes a mud refinement treatment method for producing clay from construction spoil, which sequentially adopts the multi-stage treatment steps of secondary sedimentation of heavy particles, screening of large particles, vibration treatment, and flocculation collection, A highly efficient process for producing high-quality clay is achieved. The specific plans are as follows:

A mud refinement treatment method for producing clay from construction spoil, comprising the following steps in sequence:

(1) Pre-precipitation treatment: Part of the sand with a larger specific gravity in the original mud-sand mixture is precipitated through a sedimentation tank to obtain a fine-sand mud mixture;

(2) Precipitation treatment: Part of the fine sand with larger specific gravity in the fine sand mud mixture is precipitated through the inclined mud sand separation pipeline to obtain a mud mixture;

(3) Screening treatment: pass the mud mixture into the high-pressure separation tank for screening to obtain mud water;

(4) Vibration treatment: at least part of the remaining fine sand in the muddy water is deposited at the bottom of the vibrating tank by vibration treatment;

(5) Flocculation collection: The mud dispersion in the upper part of the vibrating tank is sent to the clay sedimentation tank, and the mud dispersion is divided into the lower clay slurry and the upper water by adding a fast flocculating precipitant, and the clay slurry is collected.

Preferably, in step (1), the original mud-sand mixture containing mud slurry and sand is introduced from one end of a long sedimentation tank with a length of 10-50m, and the middle of the other end of the sedimentation tank is connected with the slurry pump, and the long The shaped sedimentation tank can precipitate part of the sand with larger specific gravity in the original mud-sand mixture, the impurities with light specific gravity will float on the surface of the original mud-sand mixture, and the fine sand mud mixture is obtained in the middle of the sedimentation tank.

Preferably, in step (2), the slurry pump sends the fine sand-mud mixture to the mud-sand separation pipeline with a length of 5-30 m inclined. Since the mud-sand separation pipeline is inclined to the ground, and the feed end of the separation pipeline is close to the ground, when When the slurry pump sends the fine sand-mud mixture into the mud-sand separation pipeline, part of the fine sand with larger specific gravity will settle at the bottom of the mud-sand separation pipeline, and the mud-sand mixture will be sent to the next process; The tank is connected, and the mud mixture enters the mud tank from the mud sand separation pipeline, and the mud tank can store the mud mixture.

Preferably, in step (3), the high-pressure pump sends the mud mixture in the mud tank to the high-pressure separation tank, the high-pressure separation tank is provided with a screen, and the high-pressure pump pressurizes the mud mixture so that the mud water can pass through the screen, Part of the fine sand with larger diameter remains in the high-pressure separation tank.

Preferably, in step (4), the mud water separated from the high-pressure separation tank is passed into the bottom of the vibrating pool, and the vibration at the bottom of the vibrating pool causes at least part of the remaining fine sand in the mud water to be vibrated and deposited at the bottom of the vibrating pool. , and a slurry dispersion is formed in the upper layer of the vibrating tank.

Preferably, in step (5), the mud dispersion liquid in the upper layer of the vibrating tank is transferred to the clay sedimentation tank, and a mud fast flocculating precipitant is added to the clay sedimentation tank, so that the clay in the mud water quickly coagulates and precipitates; after the flocculation and sedimentation is completed , the clay slurry is sent to the filter press from the bottom of the clay sedimentation tank, and the clean water is sent to the water circulation system from the upper part of the clay sedimentation tank.

Preferably, in step (1), the original mud-sand mixture containing mud slurry and sand is introduced from one end of the elongated sedimentation tank at a speed of 0.5m/s-1m/s; in step (2), fine The flow velocity of the sand-mud mixture in the separation pipe is less than 0.5m/s.

Preferably, in step (3), the aperture of the screen is 0.1-2mm, preferably 0.5-1mm; the mud mixture is pressurized to 0.15-5Mpa, preferably 0.5-1Mpa; the mud mixture enters from the bottom of the high-pressure separation tank and passes through the screen, Slurry water leaves from the upper part of the high-pressure separation tank.

Preferably, in step (4), a waterproof acoustic wave vibration device is arranged at the bottom of the vibration pool, and the frequency of the acoustic wave is 50-5000 Hz, preferably 100-500 Hz.

Preferably, in step (5), the rapid flocculation precipitation agent is an inorganic flocculant, preferably one or more of aluminum sulfate, ferric sulfate, aluminum chloride, ferric chloride, polyaluminum sulfate, polyferric sulfate, and the The inorganic flocculant is configured into a flocculant solution with a mass fraction of 0.5%-5%, and the volume ratio of the flocculant solution to the mud dispersion liquid is 1:10-100.

Beneficial effects of the present invention:

(1) The present invention successively adopts the five-level treatment steps of pre-sedimentation treatment, precipitation treatment, screening treatment, vibration treatment and flocculation collection to refine the mud used for the production of clay from the construction spoil, which can basically remove the sand, particles with a large specific gravity. The larger diameter sand can obtain a slurry dispersion with lower sand content, so that high-quality clay with higher purity can be obtained, avoiding impurities to reduce the quality of clay, and the arrangement of each step process is reasonable, which can efficiently and stably produce high-quality clay. clay.

(2) The present invention adopts the long-strip sedimentation tank to complete the pre-sedimentation treatment, which can not only rapidly deposit sand particles with obvious specific gravity or excessive particle size, but also remove most of the coarse sand particles, reduce the processing pressure of the subsequent steps, and Impurities with too light specific gravity can be removed; most of the sand particles can be removed by the inclined mud-sand separation pipeline; after two-stage precipitation treatment, most of the sand particles have been removed by precipitation, but a small part of sand (including sand with similar specific gravity) remains in the mud. Although clay can be prepared by using the slurry, a small amount of sand in it makes the quality of the prepared clay deteriorate, and the properties of the produced clay are not stable. The present invention can further remove sand with smaller particle size through screening treatment. In order to better improve the quality of clay and ensure the stability of its properties, the present invention further passes the sieved mud water into the bottom of the vibrating pool, so that a small amount of sand vibrates within the range of the bottom of the vibrating pool due to its specific gravity and particle size, while the mud The small particles in the soil are dispersed in the upper layer of the vibrating tank in the form of mud dispersion, and finally the mud dispersion in the upper layer of the vibrating tank is introduced into the clay sedimentation tank for flocculation and sedimentation collection. The invention creatively adopts vibration treatment after precipitation treatment and screening treatment, so that the formed slurry dispersion liquid is used as the raw material for preparing clay, which not only removes at least part of the remaining sand in the slurry liquid, but also makes the small particles of soil that become the slurry dispersion liquid all disappear. It can be dispersed to the upper layer of the liquid through vibration, which ensures that the produced clay has high quality and stable properties, and sedimentation through inorganic flocculants can realize the rapid collection of the above-mentioned small particles of soil, ensuring the efficiency of the preparation process.

Detailed ways

The technical solutions and advantages of the present invention will be explained and described in more detail below. It should be understood that the contents presented in the description and the specific embodiments are only for the purpose of illustrating the technical solutions and advantages of the present invention more clearly, and do not limit the protection scope of the present invention. Those skilled in the art can obtain changed technical solutions for various reasonable transformations on the basis of the disclosure of the description. As long as they do not depart from the spirit of the present invention, various changed technical solutions are included in the protection scope of the present invention. Inside.

The specific embodiment of the mud refining treatment method for producing clay from the construction spoil of the present invention is as follows:

(1) Pre-precipitation treatment: Part of the sand with a larger specific gravity in the original mud-sand mixture is precipitated through a sedimentation tank to obtain a fine-sand mud mixture;

The original mud-sand mixture containing mud and sand is introduced from one end of a long sedimentation tank with a length of 10-50m, and the middle of the other end of the sedimentation tank is connected with a slurry pump. The sand with a larger specific gravity in the middle part is precipitated, and the impurities with a light specific gravity will float on the surface of the original mud-sand mixture, and a fine-sand-mud mixture is obtained in the middle of the sedimentation tank; among them, the original mud-sand mixture containing mud liquid and sand is 0.5m/s-1m/s The speed is passed from one end of the elongated sedimentation tank.

The invention adopts a long sedimentation tank to carry out deposition pretreatment on the original mud-sand mixture, and the original mud-sand mixture is introduced into one end of the sedimentation tank and discharged at the other end of the sedimentation tank. Heavy, coarse-grained sand sinks to the bottom of the sedimentation tank, and lighter impurities float on the surface of the sedimentation tank. Therefore, the pre-sedimentation treatment can reduce the processing pressure of the sand particles and improve the treatment effect of the sand particles in the subsequent sedimentation treatment and screening treatment. A fine sand slurry mixture is obtained consisting mainly of fine sand particles and soil particles, which guarantees a high quality of the prepared clay. In order to ensure the separation effect and take into account the production efficiency, the running speed of the original mud-sand mixture in the sedimentation tank should not be too fast or too slow, and the length of the sedimentation tank should not be too long or too short. In the sedimentation tank, the speed of 0.5m/s-1m/s is the best, which can not only complete the expected separation effect, but also has a high operating efficiency.

(2) Precipitation treatment: Part of the fine sand with larger specific gravity in the fine sand mud mixture is precipitated through the inclined mud sand separation pipeline to obtain a mud mixture;

The slurry pump sends the fine sand and mud mixture to the sloping mud and sand separation pipeline with a length of 5-30m. Since the mud and sand separation pipeline is inclined to the ground, and the feeding end of the separation pipeline is close to the ground, when the slurry pump sends the fine sand and mud mixture into the During the mud-sand separation pipeline, part of the fine sand with larger specific gravity will settle at the bottom of the mud-sand separation pipeline, and the mud mixture will be sent to the next process; into the mud tank, and the mud tank can store the mud mixture; wherein, the flow velocity of the fine sand mud mixture in the separation pipeline is less than 0.5m/s.

The invention adopts two-stage sedimentation to treat the original mud-sand mixture, and after the pre-precipitation treatment, the fine-grained sand can be removed through the inclined mud-sand separation pipeline. Two-stage sedimentation treatment can first remove large particles of sand and then remove small particles of sand, avoiding the simultaneous treatment of large particles and small particles of sand in single-stage treatment, which makes the processing capacity large, and the inclined pipeline makes a large amount of sand slide down to the mud sand under the action of gravity Separating the inlet of the pipeline, reducing or even blocking the inlet of the silt separation pipeline, requires more frequent cleaning of the silt separation pipeline, which affects the treatment effect and efficiency; and the simultaneous treatment of large particles and small particles of sand makes them affect each other, resulting in more sand particles in the mud and sand The outlet of the separation pipeline is still not effectively separated, and although extending the mud-sand separation pipeline or slowing down the flow rate of the mixture can improve the separation efficiency, the production efficiency will decrease. Therefore, the two-stage treatment of the coarse and fine particles of the present invention can remove the sand more effectively and ensure higher production efficiency. Further, in order to ensure the separation effect and take into account the production efficiency, the running speed of the fine sand mud mixture in the inclined mud sand separation pipeline should not be too fast or too slow, and the length of the mud sand separation pipeline should not be too long or too short. It is best to operate at a speed of less than 0.5m/s in a silt and sand separation pipeline with a length of 5-30m, which can not only achieve the expected separation effect, but also has a high operating efficiency. Storing the mud mixture in the storage tank can coordinate the steps of the two-stage sedimentation treatment and the screening treatment, and the mud mixture left in the storage tank will also have a part of the material deposited at the bottom to achieve the separation effect.

(3) Screening treatment: pass the mud mixture into the high-pressure separation tank for screening to obtain mud water;

The high-pressure pump sends the mud mixture in the mud tank to the high-pressure separation tank. There is a screen in the high-pressure separation tank. The high-pressure pump pressurizes the mud mixture so that the mud water can pass through the screen, while some fine sand with a larger diameter is stay in the high-pressure separation tank; wherein, the mud mixture enters from the bottom of the high-pressure separation tank and passes through the screen, and the mud water leaves from the upper part of the high-pressure separation tank; the aperture of the screen is 0.1-2mm, preferably 0.5-1mm; the mud mixture is pressurized to 0.15 -5Mpa, preferably 0.5-1Mpa.

The mud mixture after the two-stage precipitation treatment is separated by specific gravity, while the sand with large particle size and relatively low specific gravity still exists in the mud mixture, and the uneven particle size distribution cannot better achieve the quality of the prepared clay. improve. Therefore, slurry water with more uniform particle size distribution can be obtained through the high-pressure separation tank. In order to better realize the separation of the mud mixture and consider reducing the blockage of the screen or facilitate the cleaning of the screen, the present invention passes the mud mixture at the bottom of the high-pressure separation tank, so that it passes through the screen from the bottom to the top, so as to avoid the deposition of substances on the screen. On the screen, the high-efficiency production can be achieved while ensuring the quality of the prepared clay. According to the particle size of the substance to be removed and the requirement of maintaining high production efficiency, the aperture of the screen should not be set too small or too large, and the corresponding pressure also needs to reach a certain level. After the test operation, the aperture of the screen is 0.5-1mm; The best operation is when the slurry mixture is pressurized to 0.5-1Mpa, which can not only achieve the expected separation effect, but also has a high operating efficiency.

(4) Vibration treatment: at least part of the remaining fine sand in the muddy water is deposited at the bottom of the vibrating tank by vibration treatment;

The mud water separated by the high-pressure separation tank is passed to the bottom of the vibrating pool, and the vibration at the bottom of the vibrating pool causes at least part of the remaining fine sand in the mud water to be vibrated and sedimented at the bottom of the vibrating pool, and the upper layer of the vibrating pool forms a mud dispersion. liquid, wherein a waterproof sonic vibration device is arranged at the bottom of the vibration pool, and the sonic frequency is 50-5000 Hz, preferably 100-500 Hz.

In order to improve the quality of the prepared clay, a vibrating tank is set up to vibrate the mud water. The vibrating device is arranged at the bottom of the vibrating tank, and the vibrated mud water diffuses upward, and the sand particles can fall down faster due to their own density or their own properties. Return to the bottom of the sedimentation tank, and the soil particles can diffuse to the upper part of the vibrating tank more easily than the sand particles due to their light weight, and the driving force for falling back is low and the distance is long. Therefore, the upper part of the vibrating tank is a mud dispersion with almost no sand particles. This step ensures the quality of the prepared clay so that very little or no sand is present in the prepared clay. According to the above vibration principle, in order to avoid the violent vibration causing various substances to be scattered in various positions of the vibration pool, when setting the vibration device at the bottom of the vibration pool, it should be noted that the frequency of vibration should be appropriate, and the frequency is too small to affect the production efficiency. If the frequency is too large, the quality of the product will be affected. After the test operation, the sound wave frequency of the waterproof acoustic wave vibration device set at the bottom is 100-500Hz.

(5) flocculation collection: the mud dispersion liquid in the upper part of the vibrating tank is sent into the clay sedimentation tank, and the mud dispersion liquid is divided into the clay slurry of the lower layer and the clear water of the upper layer by adding a fast flocculating precipitant, and the clay slurry is collected;

The mud dispersion liquid in the upper layer of the vibrating tank is transferred to the clay sedimentation tank, and the mud fast flocculating precipitant is added to the clay sedimentation tank, so that the clay in the mud water quickly coagulates and settles; It is sent to the filter press, and the clear water is sent from the upper part of the clay sedimentation tank to the water circulation system, wherein the fast flocculating precipitant is an inorganic flocculant, preferably aluminum sulfate, ferric sulfate, aluminum chloride, ferric chloride, polyaluminum sulfate , one or more of polymeric ferric sulfate, the inorganic flocculant is configured into a flocculant solution with a mass fraction of 0.5%-5%, and the volume ratio of the flocculant solution to the mud dispersion liquid is 1:10-100.

The slurry dispersion obtained by vibrating treatment can ensure the high quality of the produced clay, and its rapid recovery can ensure the efficiency of the production. The present invention adopts flocculation treatment to realize the rapid precipitation of suspended particles. Since the preparation material is inorganic clay, in order to avoid the use of organic flocculants to affect the product, the present invention adopts conventional inorganic flocculants; in order to achieve efficient flocculation and sedimentation and avoid excessive The flocculant has an impact on the product. After the test operation of the present invention, it is determined that the inorganic flocculant is configured into a flocculant solution with a mass fraction of 0.5%-5%, and the volume ratio of the flocculant solution to the mud dispersion liquid is 1:10-100. Add the slurry dispersion. As a result, the slurry dispersion liquid subjected to the multi-stage separation treatment can be quickly converted into clay slurry, that is, the high quality of the prepared clay is ensured, and the efficient production efficiency is guaranteed.

Example 1

(1) Pass the original mud-sand mixture containing mud slurry and sand at a speed of 0.8m/s from one end of a long strip sedimentation tank with a length of 30m. The sedimentation tank can precipitate some of the sand with larger specific gravity in the original mud-sand mixture, the impurities with light specific gravity will float on the surface of the original mud-sand mixture, and the fine sand mud mixture is obtained in the middle of the sedimentation tank;

(2) The slurry pump sends the fine sand and mud mixture to the inclined mud and sand separation pipeline with a length of 15m, and the flow velocity of the fine sand mud mixture in the separation pipeline is 0.3m/s; because the mud and sand separation pipeline is inclined to the ground, and The feed end of the separation pipe is close to the ground. When the slurry pump sends the fine sand and mud mixture into the mud and sand separation pipe, part of the fine sand with larger specific gravity will settle at the bottom of the mud and sand separation pipe, and the mud mixture will be sent to the next process. ; The discharge end of the mud-sand separation pipeline is connected to the mud tank, and the mud mixture enters the mud tank from the mud-sand separation pipeline, and the mud tank can store the mud mixture;

(3) The high-pressure pump sends the mud mixture in the mud tank from the bottom of the high-pressure separation tank to the high-pressure separation tank. The high-pressure separation tank is provided with a screen with an aperture of 0.8 mm, and the high-pressure pump pressurizes the mud mixture to 0.6 Mpa, so that Slurry water can leave the upper part of the high-pressure separation tank through the screen, while part of the fine sand with larger diameter remains in the high-pressure separation tank;

(4) The mud water separated by the high-pressure separation tank is passed into the bottom of the vibrating pool provided with the waterproof sonic vibration device, and the sound wave frequency is 300 Hz, and the vibration at the bottom of the vibrating pool causes at least part of the remaining fine sand in the mud water to be vibrated and precipitated At the bottom of the vibrating pool, a slurry dispersion is formed in the upper layer of the vibrating pool;

(5) The slurry dispersion in the upper layer of the vibrating tank is transferred to the clay sedimentation tank, and a 1% mass fraction of non-polymerized aluminum sulfate solution is added to the clay sedimentation tank according to the volume ratio of the flocculant solution to the slurry water of 1:80 to make the slurry The clay in the water quickly coagulates and settles; after the flocculation and sedimentation is completed, the clay slurry is sent to the filter press from the bottom of the clay sedimentation tank, and the clean water is sent to the water circulation system from the upper part of the clay sedimentation tank.

Take the mud mixture of step (2), the mud water of step (3) and the mud dispersion of step (4) for testing and comparison, wherein, the above three samples are ultrasonically dispersed into suspension, and then left standing for 1h, by comparing sedimentation The layer height can be found that the sediment layer produced by the mud mixture is the thickest, followed by the mud water, and the sediment layer of the mud dispersion is the thinnest. The above results show that the mud dispersion liquid obtained by the present invention through precipitation treatment, screening treatment and vibration treatment contains at least or even removes all sand particles, thus, the quality and properties of the prepared clay can be guaranteed to the greatest extent, and the refinement of the mud can be realized. deal with.

Although the content of the present invention includes specific embodiments, it is obvious to those skilled in the art that these embodiments can be made in various forms without departing from the spirit and scope of the invention of the claims and the equivalent technical solutions thereof. and substitutions or changes in details. The embodiments described herein should be considered in an illustrative sense only and not for purposes of limitation. Descriptions of features and aspects in each embodiment are considered to be applicable to similar features and aspects in other embodiments. Therefore, the scope of the present invention should not be limited by the specific description but by the technical solutions of the claims, and all changes within the scope of the claims and their equivalents are to be construed as being included in the technical solutions of the present invention within.

Claims (10)

1. A method for finely processing slurry for producing clay from building spoil is characterized by sequentially comprising the following steps:

(1) pre-precipitation treatment: settling part of sand with a large specific gravity in the original silt mixture by using a settling pond to obtain a fine sand-slurry mixture;

(2) and (3) precipitation treatment: precipitating part of fine sand with high specific gravity in the fine sand slurry mixture through an inclined sand-mud separation pipeline to obtain a slurry mixture;

(3) screening treatment: introducing the slurry mixture into a high-pressure separation tank for screening to obtain slurry water;

(4) vibration treatment: depositing at least part of the remaining fine sand in the slurry water at the bottom of the vibration pool through vibration treatment;

(5) and (3) flocculation collection: and sending the slurry dispersion liquid at the upper part of the vibrating tank into a clay settling tank, adding a quick flocculation precipitator to enable the slurry dispersion liquid to be divided into clay slurry at a lower layer and clear water at an upper layer, and collecting the clay slurry.

2. The method for refining the mud used for producing the clay from the building spoil as claimed in claim 1, wherein in the step (1), the original mud-sand mixture containing the mud and the sand is introduced from one end of an elongated sedimentation tank with a length of 10-50m, the middle part of the other end of the sedimentation tank is connected with a mud pump, the elongated sedimentation tank can precipitate a part of the sand with a higher specific gravity in the original mud-sand mixture, impurities with a lower specific gravity float on the surface of the original mud-sand mixture, and the middle part of the sedimentation tank obtains the fine sand-mud mixture.

3. The method for refining mud used in clay production from building spoil as claimed in claim 1, wherein in step (2), the slurry pump sends the fine sand slurry mixture to an inclined mud-sand separation pipeline with a length of 5-30m, and because the mud-sand separation pipeline is inclined from the ground and the feed end of the separation pipeline is close to the ground, when the slurry pump sends the fine sand slurry mixture to the mud-sand separation pipeline, part of the fine sand with larger specific weight is deposited at the bottom of the mud-sand separation pipeline, and the slurry mixture is sent to the next process; the discharge end of the mud-sand separation pipeline is connected with the mud tank, the mud mixture enters the mud tank from the mud-sand separation pipeline, and the mud tank can store the mud mixture.

4. The method for refining the slurry used for producing the clay from the building spoil as claimed in claim 1, wherein in the step (3), the slurry mixture in the slurry tank is fed into the high-pressure separation tank by the high-pressure pump, the high-pressure separation tank is internally provided with a screen, the high-pressure pump pressurizes the slurry mixture, so that slurry water can pass through the screen, and part of fine sand with larger diameter is left in the high-pressure separation tank.

5. The method for refining mud used in clay production from building spoil as claimed in claim 1, wherein in step (4), the mud water separated from the high pressure separation tank is introduced into the bottom of the vibration tank, and the vibration of the bottom of the vibration tank causes at least a portion of the remaining fine sand in the mud water to be vibrated and deposited on the bottom of the vibration tank, thereby forming the mud dispersion liquid on the upper layer of the vibration tank.

6. The method for refining mud slurry used in clay production from building spoil as claimed in claim 1, wherein in step (5), the mud slurry dispersion on the upper layer of the vibration pond is transferred to a clay settling pond, and a mud slurry fast flocculating and precipitating agent is added to the clay settling pond to make the clay in the mud water flocculate and precipitate fast; and after the flocculation precipitation is finished, sending the clay slurry to a filter press from the bottom of the clay settling pond, and sending clean water to a water circulation system from the upper part of the clay settling pond.

7. The method for refining the slurry used in the clay production from the construction waste soil according to claim 2 or 3, wherein in the step (1), the original slurry-sand mixture comprising slurry and sand is introduced from one end of the elongated settling tank at a speed of 0.5m/s to 1 m/s; in step (2), the flow velocity of the fine sand slurry mixture in the separation conduit is less than 0.5 m/s.

8. The method for refining mud used in clay production from building spoil as claimed in claim 4, wherein in step (3), the mesh size is 0.1-2mm, preferably 0.5-1 mm; pressurizing the slurry mixture to 0.15-5MPa, preferably 0.5-1 MPa; the slurry mixture enters from the bottom of the high pressure separation tank and passes through a screen, and the slurry water exits from the upper part of the high pressure separation tank.

9. The method for refining the mud used in clay production from building spoil as claimed in claim 5, wherein in step (4), a waterproof sound wave vibration device is installed at the bottom of the vibration pool, and the sound wave frequency is 50-5000Hz, preferably 100-500 Hz.

10. The method for finely processing the slurry for producing the clay from the building spoil according to the claim 6, wherein in the step (5), the rapid flocculation precipitator is an inorganic flocculant, preferably one or more of aluminum sulfate, ferric sulfate, aluminum chloride, ferric chloride, polyaluminum sulfate and polyferric sulfate, the inorganic flocculant is prepared into a flocculant solution with a mass fraction of 0.5-5%, and the volume ratio of the flocculant solution to the slurry dispersion is 1: 10-100.