CN111675483B - Slurry flocculation curing agent and preparation method and application thereof - Google Patents
Slurry flocculation curing agent and preparation method and application thereof Download PDFInfo
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- CN111675483B CN111675483B CN202010588633.4A CN202010588633A CN111675483B CN 111675483 B CN111675483 B CN 111675483B CN 202010588633 A CN202010588633 A CN 202010588633A CN 111675483 B CN111675483 B CN 111675483B
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
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Abstract
The application provides a slurry flocculation curing agent, which comprises polyacrylamide, polymeric aluminum magnesium sulfate, quicklime and a curing auxiliary agent, wherein the curing auxiliary agent comprises sulphoaluminate clinker, silicate clinker, gypsum, calcium oxide, magnesium oxide and magnesium chloride; polyacrylamide is a water-soluble linear high-molecular polymer, aluminum and magnesium are used as cations for the polymerized aluminum magnesium sulfate, sulfate ions are used as anions, and the polyacrylamide and the polymerized aluminum magnesium sulfate with ionic characteristics have synergistic effect, so that slurry firstly forms fine flocs, and then the fine flocs are flocculated into large-agglomerate precipitates by further action, and quicklime is also provided as an inorganic flocculant to promote flocculation. At the same time, the synergistic curing auxiliary agent forms a mutually cemented and inlaid structure in the bulk floccule. In the process of filter-pressing the slurry by adopting the invention, the solidified soil body with low water content and rapidly improved strength can be obtained.
Description
Technical Field
The application belongs to the technical field of civil construction materials, and particularly relates to a slurry flocculation solidifying agent, a preparation method of the slurry flocculation solidifying agent, and application of the slurry flocculation solidifying agent.
Background
At present, with the development of economic society, a large amount of river sludge, engineering mud and other wastes are generated in projects such as urban construction, river dredging and the like; with the limitation of consumption space and the increasing requirement of environmental protection, the reduction, solidification and stabilization of sludge and silt and further resource utilization are main development trends.
At present, for mud with low specific gravity and extremely high water content (more than 95%), a flocculating agent is generally adopted to flocculate the mud, and a filter pressing method is carried out to form mud cakes with low water content so as to achieve the purpose of reduction. If the mud cakes after filter pressing need to be recycled, the mud cakes can be cured by adopting a curing agent and used for manufacturing baking-free building materials and the like.
However, since the mud cake obtained after the press filtration does not have structural strength, the mud cake is in a slurry state again under improper handling conditions such as water immersion. If the mud cake after filter pressing is treated by the curing agent, the mud cake and the curing agent need to be mixed and stirred, but the mud cake is difficult to be uniformly mixed due to high viscosity, a large amount of energy consumption and time are needed for stirring the curing material, and the working efficiency is low.
Disclosure of Invention
The application aims to provide a slurry flocculation solidifying agent, a preparation method and application thereof, and aims to realize rapid filter pressing and dehydration of engineering slurry and directly obtain a solidified body with structural strength rapidly improved along with the age.
In order to achieve the purpose of the application, the technical scheme adopted by the application is as follows:
in a first aspect, the present application provides a slurry flocculation curing agent, which comprises the following components in parts by weight:
in a second aspect, the present application provides a method for preparing a slurry flocculation agent, comprising the steps of:
weighing the components according to the slurry flocculation curing agent;
and mixing the polyacrylamide, the polymeric aluminum magnesium sulfate, the quicklime and the curing auxiliary agent to obtain the slurry flocculation curing agent.
In a third aspect, the application provides the use of the mud flocculation curing agent in treating dehydration of construction waste mud or sludge.
The utility model provides a mud flocculation curing agent that this application first aspect provided, mud flocculation curing agent includes polyacrylamide, polymerization aluminium magnesium sulfate, lime and solidification auxiliary agent, polyacrylamide is water-soluble linear high molecular polymer, polymerization aluminium magnesium sulfate uses aluminium, magnesium is as the cation, regard sulfate ion as anion, polyacrylamide and the polymerization aluminium magnesium sulfate synergism that has ionic property, make mud flocculation curing agent have excellent electric charge nature, reach and form tiny floc earlier with the electric charge, further act on again and make tiny floc flocculate into big bulk and deposit, still provide lime as coagulant aid, adjust pH value, make the heavy metal of ionic state form the sediment in alkaline environment, flocculation has greatly been promoted, the calcium ion that it contains can form porous grid-like cell frame in mud, the intensity of increase floc. Meanwhile, the rapid curing auxiliary agent is also mixed, so that the floc can be rapidly cured, and the cured body with the strength capable of being rapidly improved along with the age can be directly obtained after slurry is subjected to filter pressing.
According to the preparation method of the slurry flocculation curing agent, the preparation method is simple and convenient, the slurry flocculation curing agent can be obtained only by mixing the components together, the preparation method is simple, complex equipment is not needed, and the application is wide.
The application of the mud flocculation curing agent in administering building abandonment mud or silt dewatering that this application third aspect provided will mud flocculation curing agent adds in the building abandonment mud of high moisture content, and the even stirring back can reach quick flocculation's effect through the building abandonment mud interact of mud flocculation curing agent and high moisture content. The mud is subjected to filter pressing to obtain a cured substance with the strength capable of being further rapidly improved along with the age, and other resource utilization can be further carried out. The problem that the mud cake and the solidified material are difficult to stir uniformly after filter pressing is avoided, and the energy consumption and the treatment time are reduced, so that the construction cost is reduced, the market prospect is wide, and the method is suitable for large-scale production. The invention has simple construction process and convenient operation, can form the solidified mud cakes with different strength development rates by adjusting the proportion, and is convenient for flexibly arranging different subsequent processes.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application more clearly apparent, the present application is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In this application, the term "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a is present alone, A and B are present simultaneously, and B is present alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, "at least one (a), b, or c", or "at least one (a), b, and c", may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, and c may be single or plural, respectively.
It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, some or all of the steps may be executed in parallel or executed sequentially, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
The first aspect of the embodiments of the present application provides a slurry flocculation curing agent, which comprises the following components in parts by weight:
according to the first aspect of the application, the slurry flocculation curing agent comprises polyacrylamide, polymeric aluminum magnesium sulfate, quicklime and a curing auxiliary agent; the quicklime provides a better pH reaction condition for the slurry flocculation curing agent, so that the polyacrylamide and the polymeric aluminum magnesium sulfate act synergistically, and the flocculation effect is improved; and simultaneously, the curing agent is included, and the curing treatment is further carried out to obtain a cured product with the strength rapidly improved along with the age.
Specifically, the slurry flocculation curing agent comprises 0.5-1 part of polyacrylamide, the polyacrylamide is a water-soluble linear high-molecular polymer, and polyacrylamide monomers can interact with each other through bonds such as hydrogen bonds to form a net structure, so that the slurry flocculation curing agent has a strong flocculation effect.
Specifically, on the basis that the slurry flocculation curing agent comprises 0.5-1 part of polyacrylamide, the flocculation curing agent further comprises 10-15 parts of polymeric aluminum magnesium sulfate, the polymeric aluminum magnesium sulfate has an ionic characteristic, aluminum and magnesium are used as cations, sulfate ions are used as anions, and the polymeric aluminum magnesium sulfate and polyacrylamide are cooperatively acted, so that the flocculation curing agent has excellent charge performance, and the charge is neutralized to form fine flocs, and then the fine flocs are flocculated into large-lump precipitates through flocculation.
Preferably, the mass ratio of the polyacrylamide to the polymeric aluminum magnesium sulfate is 1: (20-30); controlling the mass ratio of polyacrylamide to the polymeric aluminum magnesium sulfate to enable the polymeric aluminum magnesium sulfate to quickly generate a charge neutralization effect with reactants to form fine flocs, and flocculating the obtained fine flocs under the action of the polyacrylamide to obtain bulk precipitates. If the addition amount of the polymeric aluminum magnesium sulfate is too small, the reaction rate is slow, the polymeric aluminum magnesium sulfate cannot rapidly neutralize the charge, the subsequent flocculation effect of the bulk precipitate is influenced, and the curing treatment effect is further influenced.
Specifically, on the basis that the slurry flocculation curing agent comprises 0.5-1 part of polyacrylamide, the slurry flocculation curing agent further comprises 5-10 parts of quicklime, the quicklime is provided as a coagulant aid, the pH value in the reaction process is adjusted, so that heavy metal in an ionic state is precipitated in an alkaline environment, the flocculation effect is greatly promoted, and calcium ions contained in the slurry can form a porous latticed pore frame in the slurry, so that the strength of a floc is increased. The quicklime can also react with the curing assistant chemically, so that the strength of the cured body is improved.
Specifically, on the basis that the slurry flocculation curing agent comprises 0.5-1 part of polyacrylamide, the slurry flocculation curing agent further comprises 50-80 parts of curing auxiliary agent, under the action of the curing auxiliary agent, the solid strength of a mud cake obtained after filter pressing can be rapidly improved, the energy consumption and the processing time are reduced, and therefore the construction cost is reduced, the market prospect is wide, and the method is suitable for large-scale production.
Preferably, the curing auxiliary agent comprises sulphoaluminate clinker, gypsum, silicate clinker, magnesium oxide and magnesium chloride; the curing assistant is selected from hydraulic mineral, and can be cured by hydration reaction with water in the slurry, so as to further improve the strength of the prepared solid product. More preferably, a hydraulic mineral containing aluminum, silicon, and magnesium is selected as the curing aid, which can rapidly undergo hydration reaction, further convert a large amount of free water into structural water, and rapidly cure to form a solid product having high strength and low water content.
Preferably, the curing assistant comprises the following components in parts by weight:
the addition of various curing aids is controlled, the reaction rate and the reaction effect of hydration reaction are improved, a large amount of free water is further converted into structural water, and the structural water is rapidly cured to form a solid product with high strength and low water content.
In some embodiments, the mud flocculation curing agent comprises the following components in parts by weight: 0.5 part of polyacrylamide, 15 parts of polymeric aluminum magnesium sulfate and Al2O325-35 parts of CaO, 35-40 parts of SiO210 to 20 portions of SO312-17 parts of MgO 5-10 parts of MgCl21-3 parts. The early strength of the solidified body obtained after filter pressing is higher, and the later strength can be continuously increased.
In other embodiments, the slurry flocculation curing agent comprises the following components in parts by weight: 0.5 part of polyacrylamide, 15 parts of polymeric aluminum magnesium sulfate and Al2O330-40 parts of CaO, 35-40 parts of SiO28 to 16 parts of SO320-25 parts, MgO 8-12 parts, MgCl22 to 3 parts of. The early strength of the solidified body obtained after filter pressing can be rapidly improved, and the later strength is slowly increased.
In still other embodiments, the mud flocculation curing agent comprises the following components in parts by weight: 0.5 part of polyacrylamide, 15 parts of polymeric aluminum magnesium sulfate, 35-40 parts of CaO, and Al2O315-20 parts of SiO225 to 30 parts of SO310-15 parts of MgO 5-10 parts of MgCl21-3 parts. The early strength of the solidified body obtained after filter pressing is lower, and the later strength is continuously increased.
Preferably, the particle size of the slurry flocculation curing agent is 200-250 meshes, the particle size of the slurry flocculation curing agent is controlled, and the effect of mixing the slurry flocculation curing agent with the slurry is better. If the particle size is too large, the time required for achieving the agglomeration of a predetermined target is long, which affects the efficiency; if the particle size is too small, the strength of solidification in the form of aggregates is affected, the mechanical hardness of the product is reduced, and the properties of the product are affected.
The second aspect of the embodiments of the present application provides a method for preparing a slurry flocculation agent, comprising the following steps:
s01, weighing the components according to the slurry flocculation curing agent;
s02, mixing polyacrylamide, polymeric aluminum magnesium sulfate, quicklime and a curing aid to obtain the slurry flocculation curing agent.
In the step S01, the selection and addition amount of each component of the slurry flocculation curing agent are as discussed above, and will not be described herein.
In the above step S02, the components are directly mixed; preferably, the mixing treatment includes, but is not limited to, stirring treatment, and the components of the obtained slurry flocculation curing agent are uniformly mixed and are in a powder shape.
The preparation method is simple and convenient, the slurry flocculation curing agent can be obtained only by mixing the components together, and the preparation method is simple, does not need complex equipment and has wide application.
The third aspect of the application provides a mud flocculation solidifying agent is in administering building abandonment mud or the application of silt dehydration, with mud flocculation curing agent add in the building abandonment mud of high moisture content, building abandonment mud interact through mud flocculation curing agent and high moisture content, can make mud flocculate fast, it can improve fast to obtain the mud cake intensity after the filter-pressing simultaneously, avoided the problem that mud cake and solidified material are difficult to the stirring uniformity after the filter-pressing, energy consumption and processing time have been reduced, thereby construction cost is reduced, market prospect is wide, and the method is suitable for large-scale production. The invention has simple construction process and convenient operation, can form the solidified mud cakes with different strength development rates by adjusting the proportion, and is convenient for flexibly arranging different subsequent processes.
Preferably, the application of the mud flocculation curing agent in treating the building waste mud comprises the following steps:
G01. mixing a slurry flocculation curing agent with the slurry with high water content to obtain a first mixture;
G02. standing the first mixture for reaction, and separating to obtain a supernatant and a lower-layer precipitate; and carrying out filter pressing treatment on the lower-layer precipitate to obtain a granular condensate.
In the step G01, it is preferable that the high water content slurry has a water content of 1.05 to 1.3, and the slurry flocculation curing agent is capable of treating the high water content slurry in a preferable manner by cooperating with the effects of the plurality of organic flocculants and the curing aids.
Preferably, in the step of mixing the slurry flocculation curing agent with the slurry with high water content, the adding mass of the slurry flocculation curing agent is 5-30 kg per square meter of the waste slurry; the addition amount of the slurry flocculation curing agent is controlled, 5-30 kg of the slurry flocculation curing agent is contained in each square meter of slurry, and the good flocculation curing effect is guaranteed. Further, the quality of the added slurry flocculation curing agent is different according to the difference of the water content and the specific gravity of the waste slurry.
In the step G02, preferably, the first mixture is subjected to standing reaction for 5-10 minutes, so that the slurry flocculation curing agent is completely reacted, and the slurry is guaranteed to be layered; separating to obtain supernatant and lower precipitate.
Further, the lower layer precipitate was subjected to filter pressing treatment to obtain an aggregate-like cured product. Preferably, the water content of the pellet-like solidified material is not more than 20%, and the water content is controlled to be low, so that the strength of the product is high.
Through the interaction of the slurry flocculation curing agent and the building waste slurry with high water content, the high-strength granular cured material is obtained after filter pressing, the problem that the mud cake and the curing material are difficult to stir uniformly after filter pressing is avoided, the energy consumption and the treatment time are reduced, the construction cost is reduced, the market prospect is wide, and the method is suitable for large-scale production. The invention has simple construction process and convenient operation, can form the solidified mud cakes with different strength development rates by adjusting the proportion, and is convenient for flexibly arranging different subsequent processes.
The following description will be given with reference to specific examples.
Example 1
Slurry flocculation curing agent and application thereof
The mud flocculation curing agent comprises the following components in parts by weight: 0.5 part of polyacrylamide, 15 parts of polymeric aluminum magnesium sulfate, 5 parts of quicklime and Al2O325 parts of CaO, 35 parts of SiO210 parts of SO312 parts of MgO 5 parts of MgCl21 part.
The application of the slurry flocculation curing agent comprises the following steps:
the method comprises the steps of taking engineering waste soil in subway shield tunneling construction as a main processing object, and forming high-water-content slurry with the specific gravity of 1.1 after hydraulic cyclone and multistage separation;
mixing the high water content slurry with the slurry flocculation curing agent to obtain a first mixture, wherein the addition amount of the slurry flocculation curing agent is 15-25kg/m3；
And (3) standing the first mixture for 5 minutes, pumping out the supernatant by using a slurry pump, inputting the flocculated high-concentration slurry of the lower layer into a plate-and-frame filter press, and performing filter pressing for 30-40 minutes until the water content is lower than 20% to obtain a mud cake-shaped cured substance with the rapidly improved strength.
Example 2
Slurry flocculation curing agent and application thereof
The mud flocculation curing agent comprises the following components in parts by weight: 0.5 part of polyacrylamide, 15 parts of polymeric aluminum magnesium sulfate, 8 parts of quicklime and Al2O330 parts of CaO 38 parts of SiO216 portions of SO315 parts of MgO 8 parts of MgCl2And 2 parts.
The application of the slurry flocculation curing agent comprises the following steps:
engineering waste soil in port excavation is taken as a main treatment object, and after mud and sand are separated, high-water-content slurry with the specific gravity of 1.15 is formed;
mixing the high water content slurry with the slurry flocculation curing agent to obtain a first mixture, wherein the addition amount of the slurry flocculation curing agent is 5-15kg/m3；
And (3) standing the first mixture for 5 minutes, and pumping out the supernatant by a slurry pump to form a mud cake-shaped cured substance with the strength capable of being rapidly improved.
Example 3
Slurry flocculation curing agent and application thereof
The mud flocculation curing agent comprises the following components in parts by weight: 0.5 part of polyacrylamide, 15 parts of polymeric aluminum magnesium sulfate, 10 parts of quicklime and Al2O335 parts of CaO40 parts of SiO220 portions of SO317 parts, MgO 10 parts, MgCl2And 3 parts.
The application of the slurry flocculation curing agent comprises the following steps:
waste slurry in pile foundation engineering is taken as a main object, and the specific gravity of the slurry is 1.25;
mixing the high water content slurry with the slurry flocculation curing agent to obtain a first mixture, wherein the addition amount of the slurry flocculation curing agent is 20-30kg/m3；
And (3) standing the first mixture for 5 minutes, pumping out supernatant liquor by using a slurry pump, and performing dehydration and pressure filtration by using a plate-and-frame filter press to form a granular condensate with rapidly improved strength.
The strength of the granular cured products prepared in the embodiments 1 to 3 is analyzed, and within 1 day of the analysis preparation, the strength of the granular cured product prepared in the embodiment 1 is 5 to 10MPa, the strength is high, the granular cured product can be directly used for forming and forming a subsequent building material or can be transported outside, and special curing treatment is not needed; the strength of the granular cured product prepared in the embodiment 2 is 0.2-1.5 MPa, and the thickening agent is added into the slurry after part of supernatant liquid is extracted to form fluidized filler for filling the pipeline groove; the pellet-like cured product prepared in example 3 had a strength of 5 to 10MPa and a high strength, and could be subjected to static pressure forming to prepare a non-fired building material.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (2)
1. The application of the sludge flocculation curing agent is characterized by comprising the following steps:
engineering slurry in subway shield tunneling construction is taken as a main processing object, and after hydraulic cyclone and multistage separation, high-water-content slurry with the specific gravity of 1.1 is formed;
mixing the high-water-content slurry with the slurry flocculation curing agent to obtain a first mixture, wherein the addition amount of the slurry flocculation curing agent is 15-25kg/m3；
Standing the first mixture for 5 minutes, pumping out supernatant liquor by using a slurry pump, inputting high-concentration slurry obtained after flocculation of the lower layer into a plate-and-frame filter press, and performing filter pressing for 30-40 minutes until the water content is lower than 20% to obtain a mud cake-shaped cured substance with rapidly improved strength, wherein the mud cake-shaped cured substance can be directly extruded to form a building material;
the slurry flocculation curing agent comprises the following components in parts by weight:
0.5-1 part of polyacrylamide;
10-15 parts of polymeric aluminum magnesium sulfate;
5-10 parts of quicklime;
50-80 parts of a curing assistant.
2. The application of the mud flocculation curing agent as claimed in claim 1, wherein the particle size of the mud flocculation curing agent is 200-250 meshes.
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| CN113666588A (en) * | 2021-07-26 | 2021-11-19 | 江苏省科佳工程设计有限公司 | Method for curing high-water-content slurry |
| CN113735412B (en) * | 2021-11-05 | 2022-02-08 | 中南大学 | Efficient dehydration and solidification treatment agent for waste slurry of foundation engineering and use method thereof |
| CN113912373B (en) * | 2021-11-22 | 2022-06-10 | 纳思同(无锡)科技发展有限公司 | High-performance curing agent for quickly curing soft soil with high water content into roadbed filler |
| CN115152580B (en) * | 2022-06-28 | 2023-11-28 | 重庆交通大学 | Waste engineering slurry soft concretion planting matrix |
| CN115286334B (en) * | 2022-07-20 | 2023-06-06 | 武汉理工大学 | Rapid dehydration and solidification material for dredging sludge and application thereof |
| CN116282834A (en) * | 2023-03-30 | 2023-06-23 | 腾达建设集团股份有限公司 | Sludge flocculation and sedimentation treatment method |
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| CN100358816C (en) * | 2005-11-22 | 2008-01-02 | 刘茂平 | Solidified agent for drilling well waste mud |
| CN101863601A (en) * | 2009-04-14 | 2010-10-20 | 株式会社安农津技研 | Flocculation curing agent, composition thereof and stabilization improvement method of silt type soil |
| CN106865952A (en) * | 2017-03-20 | 2017-06-20 | 北京君联合环境科技有限公司 | A kind of method of sludge adjusting material and its application and quenched sludge |
| CN109231757A (en) * | 2018-09-28 | 2019-01-18 | 浙江广安建设有限公司 | A kind of cast-in-situ bored pile discarded slurry mud-water separation reagent and its separation method |
| CN110577349A (en) * | 2019-10-23 | 2019-12-17 | 深圳研源环境科技有限公司 | Building slurry treatment process and application |
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