CN111268821A - Fine treatment method for slurry for clay production from building spoil - Google Patents
Fine treatment method for slurry for clay production from building spoil Download PDFInfo
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- CN111268821A CN111268821A CN202010086024.9A CN202010086024A CN111268821A CN 111268821 A CN111268821 A CN 111268821A CN 202010086024 A CN202010086024 A CN 202010086024A CN 111268821 A CN111268821 A CN 111268821A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
Technical Field
The invention relates to a process for producing clay from building spoil, in particular to a method for finely processing slurry for producing clay from building spoil.
Technical Field
Along with the increasingly important international status of the economic scale development of China, the global economic development is emphasized, the urbanization speed of China is increased more and more, and the urbanization proportion is increased more and more. This is mainly reflected in the increasing number of buildings in cities, and the development scale of underground spaces is increasing. However, the construction waste is increased, and not only the construction waste generated by renovating or dismantling the old building but also the excessive intermediate materials of the newly built building are directly discarded. In order to better realize the comprehensive treatment of cities and the comprehensive utilization of resources, the recycling of construction wastes becomes an essential idea for national advocation, public demand and sustainable development. The construction waste is reused and promoted to grow, and the forward circulation of social economy is promoted while the construction resources are recycled.
The construction waste soil is one of common construction wastes, and can be applied to various purposes after being treated, such as green belt plant soil for beautifying the environment, raw materials for filling soil erosion parts to maintain the ecological environment, and the like for producing building materials. The construction waste soil can be subjected to different targeted treatments according to different purposes, generally comprises the treatment steps of removing impurities, crushing into required particle size, separating and collecting target substances and the like, and although the treatment means and the realized purpose of the main steps are similar, the purpose of the construction waste soil practically determines the treatment method adopted by related industry personnel.
At present, in the process of producing clay by using building spoil, only gravels with larger volume in a mud-sand mixture are usually removed, and fine sands in slurry are not usually removed. Because, the clay prepared by using the building spoil as the raw material is generally considered to have a market value different from that of the clay obtained by using a normal raw material or a normal method because the 'impurities' in the clay cannot be treated 'cleanly' due to the waste material. However, the sources of the building spoil are not all from waste buildings, including waste intermediate materials in newly built buildings, and the building spoil after the fine treatment can produce high-quality clay which has no substantive difference in function from normal raw materials or clay prepared by a normal method, and the sources of the building spoil are more and more extensive, and the normal raw materials or the clay mining resources are relatively less and less, so that the difference in the economy of different raw materials is difficult to ignore. Meanwhile, with the increasing urbanization speed, the demand of high-quality clay is increasing. Therefore, more and more enterprises adopting building spoil to produce clay begin to enter the high-quality clay market. In the prior art for producing clay by using building spoil, a method for separating mud and sand mainly utilizes a physical precipitation method, and separates mud liquid and sand by utilizing the physical property that the precipitation speed of the sand is higher than that of the clay through a mud pump and an inclined pipeline with a longer end, or separates the mud liquid and the sand by utilizing the centrifugal force difference of substances with different specific gravities through a hydrocyclone. The screening technology can well separate mud and sand on particle size, but the adoption of a large-aperture mesh screen has low efficiency for removing fine sand grains, the cost of the mesh screen with smaller aperture is higher, the production separation rate is lower, and the mesh screen is often blocked by small particles. Due to the requirement of comprehensive production efficiency and high-quality clay production, the slurry for producing the clay from the building spoil needs to be refined, and the research and the improvement are still needed, so that the production enterprises can efficiently produce the high-quality clay.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for finely processing slurry for producing clay from building spoil, which sequentially adopts multi-stage processing steps of secondary sedimentation of heavy particles, screening and filtering of large particles, vibration processing and flocculation collection, and realizes a process for efficiently producing high-quality clay. The specific scheme is as follows:
a method for finely processing slurry for producing clay from building spoil sequentially comprises 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.
Preferably, in the step (1), the original silt mixture containing the silt and the sand is introduced from one end of an elongated settling tank with the length of 10-50m, the middle part of the other end of the settling tank is connected with a silt pump, the elongated settling tank can settle part of the sand with higher specific gravity in the original silt mixture, impurities with low specific gravity can float on the surface of the original silt mixture, and the middle part of the settling tank obtains the fine silt mixture.
Preferably, in the step (2), the slurry pump sends the fine sand slurry mixture to a sand-mud separation pipeline with an inclined length of 5-30m, and because the sand-mud separation pipeline is arranged obliquely to the ground and the feeding end of the separation pipeline is close to the ground, when the slurry pump sends the fine sand slurry mixture to the sand-mud separation pipeline, part of the fine sand with larger specific weight is deposited at the bottom of the sand-mud 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.
Preferably, in the step (3), the high-pressure pump sends the slurry mixture in the slurry tank to a high-pressure separation tank, a screen is arranged in the high-pressure separation tank, 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.
Preferably, in the step (4), the slurry water separated by the high-pressure separation tank is introduced into the bottom of the vibration tank, and at the same time, the vibration of the bottom of the vibration tank enables at least part of residual fine sand in the slurry water to be vibrated and precipitated at the bottom of the vibration tank, so that slurry dispersion liquid is formed at the upper layer of the vibration tank.
Preferably, in the step (5), the slurry dispersion liquid on the upper layer of the vibration pool is conveyed into a clay sedimentation pool, and a rapid slurry flocculation precipitator is added into the clay sedimentation pool, so that the clay in the slurry water is rapidly coagulated and precipitated; 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.
Preferably, in the step (1), the original silt mixture containing the silt and the sand is introduced into the elongated sedimentation tank from one end 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.
Preferably, 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.
Preferably, in the step (4), a waterproof type sound wave vibration device is arranged at the bottom of the vibration pool, and the sound wave frequency is 50-5000Hz, preferably 100-500 Hz.
Preferably, 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 the mass fraction of 0.5% -5%, and the volume ratio of the flocculant solution to the slurry dispersion liquid is 1: 10-100.
The invention has the beneficial effects that:
(1) according to the invention, the slurry for producing the clay from the building spoil is refined by sequentially adopting five-stage treatment steps of pre-precipitation treatment, screening treatment, vibration treatment and flocculation collection, sand with large specific gravity and sand with large particle size can be basically removed, and slurry dispersion with lower sand content can be obtained, so that high-quality clay with higher purity can be obtained, impurities are prevented from reducing the clay quality, the flow arrangement of each step is reasonable, and the high-quality clay can be efficiently and stably produced.
(2) The invention adopts the strip-shaped sedimentation tank to finish the pre-sedimentation treatment, not only can quickly sediment sand particles with obvious specific gravity or overlarge particle size, but also can remove most coarse sand particles, reduce the treatment pressure of the following step flow, and can remove impurities with overlarge specific gravity; the inclined mud-sand separation pipeline can remove most of sand particles; after the two-stage settling process, most of the sand particles have been removed by settling, but a small portion of the sand (including sand of similar specific gravity) remains in the slurry. Although clay can be prepared by adopting the mud, the clay prepared by adopting the mud is reduced in quality due to a small amount of sand, and the property of the produced clay is not stable. The invention can further remove sand with smaller particle size through screening treatment. In order to better improve the clay quality and ensure the stable property of the clay, the invention further leads the screened muddy water to the bottom of the vibrating pool, so that a small amount of sand vibrates in the range of the bottom of the vibrating pool due to the specific gravity and the particle size, the small-particle soil in the mud is dispersed on the upper layer of the vibrating pool in the form of mud dispersion liquid, and finally the mud dispersion liquid on the upper layer of the vibrating pool is led into a clay settling pool for flocculation, precipitation and collection. According to the invention, the vibration treatment is creatively adopted after the precipitation treatment and the screening treatment, so that the formed slurry dispersion liquid is used as a raw material for preparing the clay, at least part of residual sand in slurry is removed, and small-particle soil which becomes the slurry dispersion liquid can be dispersed to the upper layer of the liquid through vibration, thus the produced clay has high quality and stable property, the small-particle soil can be rapidly collected through sedimentation by using an inorganic flocculant, and the efficiency of the preparation process is ensured.
Detailed Description
The technical solutions and advantages of the present invention are explained and illustrated in more detail below. It should be understood that the contents presented in the description and the detailed description are only for more clearly illustrating the technical solutions and the advantages of the present invention, and do not limit the protection scope of the present invention. On the basis of the disclosure of the specification, a person skilled in the art can modify the technical solution according to various reasonable changes, and the modified technical solution is included in the protection scope of the invention as long as the person does not depart from the spirit of the invention.
The concrete implementation mode of the slurry refining treatment method for producing clay by using building spoil provided by the invention is as follows:
(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;
introducing an original mud-sand mixture containing mud liquid and sand into a long-strip-shaped sedimentation tank with the length of 10-50m, wherein the middle part of the other end of the sedimentation tank is connected with a mud liquid pump, the long-strip-shaped sedimentation tank can precipitate part of the sand with higher specific gravity in the original mud-sand mixture, impurities with low specific gravity can float on the surface of the original mud-sand mixture, and the middle part of the sedimentation tank obtains a fine sand-mud mixture; wherein an initial silt mixture comprising a silt slurry and sand is passed into the elongate settling tank at a velocity of from 0.5m/s to 1 m/s.
The invention adopts a strip-shaped sedimentation tank to carry out sedimentation pretreatment on an original silt mixture, the original silt mixture is introduced into one end of the sedimentation tank and discharged from the other end of the sedimentation tank, and the principle is that the heavy coarse-grained sands are sunk into the bottom of the sedimentation tank by utilizing the specific gravity difference of substances in the mixture, and the light impurities float on the surface of the sedimentation tank. From this, through the preliminary sedimentation processing can make the processing pressure that can alleviate sand granule with screening processing after, improve the treatment effect to sand granule, because the impurity that floats is got rid of basically in this step moreover, the sedimentation tank middle part has obtained mainly by the fine sand mud mixture of fine sand granule and soil particle, and it has guaranteed the high quality of preparation clay. In order to ensure the separation effect and take production efficiency into consideration, the running speed of the original silt mixture in the sedimentation tank is not too fast or too slow, and the length of the sedimentation tank is not too long or too short, through experimental running, the original silt mixture runs optimally at the speed of 0.5m/s-1m/s in the sedimentation tank with the length of 10-50m, and the expected separation effect can be achieved, and the running efficiency is higher.
(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;
the slurry pump sends the fine sand slurry mixture to a sludge-sand separation pipeline with the inclined length of 5-30m, and because the sludge-sand separation pipeline is arranged obliquely with the ground and the feeding end of the separation pipeline is close to the ground, when the slurry pump sends the fine sand slurry mixture to the sludge-sand separation pipeline, part of fine sand with larger specific gravity can be deposited at the bottom of the sludge-sand separation pipeline, and the slurry mixture is sent to the next working procedure; the discharge end of the mud-sand separation pipeline is connected with a mud tank, a mud mixture enters the mud tank from the mud-sand separation pipeline, and the mud tank can store the mud mixture; wherein the flow velocity of the fine sand slurry mixture in the separation pipeline is less than 0.5 m/s.
The invention adopts two-stage sedimentation to treat the original silt mixture, and fine sand can be removed through the inclined silt separation pipeline after the pre-sedimentation treatment. The two-stage precipitation treatment can remove large-particle sand firstly and then remove small-particle sand, so that the problem that the treatment capacity is large due to the simultaneous treatment of the large-particle sand and the small-particle sand in the single-stage treatment is avoided, and the inclined pipeline enables a large amount of sand to slide to the inlet of the silt separating pipeline under the action of gravity, so that the inlet of the silt separating pipeline is reduced or even blocked, the silt separating pipeline needs to be cleaned more frequently, and the treatment effect and efficiency are influenced; and large-particle sand and small-particle sand are treated simultaneously so as to influence each other, so that more sand particles are still not effectively separated at the outlet of the sand-mud separation pipeline, and the production efficiency is reduced although the separation efficiency can be improved by prolonging the sand-mud separation pipeline or reducing the flowing speed of the mixture. Therefore, the sand of coarse and fine particles is treated in two stages, the sand can be removed more effectively, and higher production efficiency is guaranteed. Further, in order to ensure the separation effect and take production efficiency into consideration, the running speed of the fine sand slurry mixture in the inclined sand-mud separation pipeline is not too fast or too slow, and the length of the sand-mud separation pipeline is not too long or too short, through test running, the fine sand slurry mixture runs optimally at the speed of less than 0.5m/s in the sand-mud separation pipeline with the length of 5-30m, and the fine sand slurry mixture can achieve the expected separation effect and has higher running efficiency. The storage of the slurry mixture in the storage tank can coordinate the steps of two-stage sedimentation treatment and screening treatment, and a part of substances in the slurry mixture standing in the storage tank can be deposited at the bottom to realize the separation effect.
(3) Screening treatment: introducing the slurry mixture into a high-pressure separation tank for screening to obtain slurry water;
the high-pressure pump sends the slurry mixture in the slurry tank into a high-pressure separation tank, a screen is arranged in the high-pressure separation tank, 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; wherein the slurry mixture enters from the bottom of the high-pressure separation tank and passes through a screen, and the slurry water leaves from the upper part of the high-pressure separation tank; the aperture of the screen mesh is 0.1-2mm, preferably 0.5-1 mm; the slurry mixture is pressurized to 0.15-5MPa, preferably 0.5-1 MPa.
The mud mixture subjected to the two-stage precipitation treatment is subjected to material separation through specific gravity, sand with large particle size and relatively low specific gravity still exists in the mud mixture, and the improvement on the quality of the prepared clay cannot be better realized due to uneven particle size distribution. Therefore, muddy water having a more uniform particle size distribution can be obtained by the high-pressure separation tank. In order to better realize the separation of the slurry mixture and consider the reduction of the blockage of the screen or the convenience of the cleaning of the screen, the slurry mixture is introduced into the bottom of the high-pressure separation tank and passes through the screen from bottom to top, so that the deposition of substances on the screen is avoided, the quality of the prepared clay is ensured, and meanwhile, the high-efficiency production is realized. According to the requirements of the particle size of the substances to be removed and the maintenance of higher production efficiency, the aperture of the screen is not suitable to be too small or too large, the corresponding pressure also needs to reach a certain degree, and the aperture of the screen is 0.5-1mm after test operation; the slurry mixture is pressurized to 0.5-1MPa for optimal operation, which can achieve the expected separation effect and has higher operation efficiency.
(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;
and (2) introducing the slurry water separated by the high-pressure separation tank into the bottom of the vibration tank, and simultaneously vibrating the bottom of the vibration tank to ensure that at least part of residual fine sand in the slurry water is vibrated and precipitated at the bottom of the vibration tank, so as to form slurry dispersion liquid on the upper layer of the vibration tank, wherein a waterproof sound wave vibration device is arranged at the bottom of the vibration tank, and the sound wave frequency is 50-5000Hz, preferably 100-500 Hz.
In order to improve the quality of clay preparation, the vibrating tank is arranged to vibrate muddy water, the vibrating device is arranged at the bottom of the vibrating tank, the muddy water subjected to vibration is diffused upwards, sand particles can fall back to the bottom of the settling tank faster due to self density or self property, soil particles can be diffused to the upper part of the vibrating tank more easily than the sand particles due to light self specific gravity, the driving force for falling back is lower, the path is long, and therefore the upper part of the vibrating tank is the mud dispersion liquid almost without the sand particles. This step ensures the quality of the clay prepared so that very little or no sand is present in the clay prepared. According to the vibration principle, in order to avoid dispersion of various substances at each position of the vibration pool caused by severe vibration, the vibration device is arranged at the bottom of the vibration pool, attention should be paid to proper vibration frequency, the undersize frequency affects production efficiency, the oversize frequency affects product quality, and through test operation, the sound wave frequency of the waterproof sound wave vibration device arranged at the bottom is 100-500Hz, so that the waterproof sound wave vibration device has better production efficiency on the basis of obtaining high-quality clay.
(5) And (3) flocculation collection: sending the slurry dispersion liquid at the upper part of the vibrating tank into a clay settling tank, adding a rapid flocculation precipitator to enable the slurry dispersion liquid to be divided into clay slurry at the lower layer and clear water at the upper layer, and collecting the clay slurry;
the slurry dispersion liquid on the upper layer of the vibration pool is conveyed into a clay sedimentation pool, and a rapid slurry flocculation precipitator is added into the clay sedimentation pool, so that the clay in the slurry water is rapidly coagulated and precipitated; after the flocculation and precipitation are finished, clay slurry is sent to a filter press from the bottom of a clay settling pond, clear water is sent to a water circulation system from the upper part of the clay settling pond, wherein the quick flocculation and precipitation agent 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 the mass fraction of 0.5-5%, and the volume ratio of the flocculant solution to the slurry dispersion liquid is 1: 10-100.
The slurry dispersion obtained by vibration treatment can ensure the high quality of the produced clay, and the clay is quickly recovered to ensure the production efficiency. The invention adopts flocculation treatment to realize the rapid sedimentation of suspended particles, and because the prepared substance is inorganic clay, the invention adopts conventional inorganic flocculant in order to avoid the influence of organic flocculant on the product; in order to realize efficient flocculation and precipitation and avoid influence of excessive flocculating agent on products, the invention determines to prepare inorganic flocculating agent into flocculating agent solution with mass fraction of 0.5-5% through experimental operation, and adds the flocculating agent solution and the slurry dispersion liquid into the slurry dispersion liquid according to the volume ratio of 1: 10-100. From this, can change the mud dispersion through multistage separation processing into clay thick liquid fast, guarantee the high-quality of preparation clay promptly, guarantee efficient production efficiency.
Example 1
(1) The method comprises the following steps of (1) introducing an original mud-sand mixture containing mud liquid and sand at the speed of 0.8m/s from one end of a strip-shaped sedimentation tank with the length of 30m, wherein the middle part of the other end of the sedimentation tank is connected with a slurry pump, the strip-shaped sedimentation tank can sediment part of the sand with higher specific gravity in the original mud-sand mixture, impurities with low specific gravity can 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;
(2) the slurry pump sends the fine sand slurry mixture to an inclined slurry-sand separation pipeline with the length of 15m, and the flow speed of the fine sand slurry mixture in the separation pipeline is 0.3 m/s; because the silt separating pipeline is obliquely arranged with the ground, and the feeding end of the separating pipeline is close to the ground, when the slurry pump sends the fine sand-silt mixture into the silt separating pipeline, part of fine sand with larger specific gravity can be deposited at the bottom of the silt separating pipeline, and the silt mixture is sent to the next working procedure; the discharge end of the mud-sand separation pipeline is connected with a mud tank, a 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 slurry mixture in the slurry tank into the high-pressure separation tank from the bottom of the high-pressure separation tank, a screen with the aperture of 0.8mm is arranged in the high-pressure separation tank, the high-pressure pump pressurizes the slurry mixture to 0.6Mpa, so that slurry water can leave from the upper part of the high-pressure separation tank through the screen, and part of fine sand with larger diameter is left in the high-pressure separation tank;
(4) introducing the slurry water separated by the high-pressure separation tank into the bottom of a vibration pool provided with a waterproof sound wave vibration device, wherein the sound wave frequency is 300Hz, and simultaneously vibrating the bottom of the vibration pool to ensure that at least part of residual fine sand in the slurry water is vibrated and precipitated at the bottom of the vibration pool, so that slurry dispersion liquid is formed on the upper layer of the vibration pool;
(5) the slurry dispersion liquid on the upper layer of the vibration pool is conveyed into a clay sedimentation pool, and non-polymeric aluminum sulfate solution with the mass fraction of 1% is added into the clay sedimentation pool according to the volume ratio of the flocculant solution to the slurry water of 1:80, so that the clay in the slurry water is rapidly coagulated and precipitated; 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.
And (3) performing test comparison on the slurry mixture obtained in the step (2), the slurry water obtained in the step (3) and the slurry dispersion liquid obtained in the step (4), wherein the three samples are ultrasonically dispersed into suspension, then standing for 1h, and comparing the heights of settled layers, so that the settled layer generated by the slurry mixture is thickest, the slurry water is second, and the settled layer of the slurry dispersion liquid is thinnest. The above results show that the slurry dispersion obtained by the precipitation treatment, the screening treatment and the vibration treatment of the invention contains least or even all sand grains, thereby maximally ensuring the quality and the property of the prepared clay and realizing the fine treatment of the slurry.
While the present disclosure includes specific embodiments, it will be apparent to those skilled in the art that various substitutions or alterations in form and detail may be made to these embodiments without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. The embodiments described herein are to be considered in all respects only as illustrative and not restrictive. The description of features and aspects in each embodiment is believed to apply to similar features and aspects in other embodiments. Therefore, the scope of the invention should be defined not by the detailed description but by the claims, and all changes within the scope of the claims and equivalents thereof should be construed as being included in the technical solution of the present invention.
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.
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