Delayed curing of the water reaction and the flow state of the one-stop consolidation-curing method

Abstract

The present application relates to a kind of delayed solidification agent hydration reaction and flow state mud one-stop consolidation-curing method, in the process of dredging mud reclamation, add delayed solidification agent powder, delayed solidification agent is in the surface of solidification agent with a layer of degradable waterproof film, solidification agent does not occur solidification reaction in initial stage, at this time, vacuum consolidation method is handled dredging mud, after vacuum consolidation treatment ends, waterproof film degradation ends, solidification agent and the water in contact with solidification reaction in dredging mud, the present application will be sequentially fused into one body with two kinds of technology, i.e., traditional yard dredging mud vacuum negative pressure consolidation treatment and adding solidification agent curing treatment, both reduce the water content in dredging mud, and reduce construction cost.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of delay curing agent hydration reaction and flow state mud one-step consolidation-curing method, belong to dredged mud processing field. BACKGROUND

[0002] Engineering construction such as mixing pile, shield, sewage treatment in sewage treatment plant, channel dredging and other construction activities will produce a large amount of engineering waste mud, sludge, dredged mud and other high water content flow state mud; how to treat these flow state mud and change it into available fill resources to reduce the damage of waste gas to environmental resources is a practical problem.

[0003] At present, the method for treating a large amount of flow state mud mainly can be divided into two kinds, one is consolidation, and the other is solidification. The method of consolidation is to apply positive pressure or vacuum negative pressure to the flow state mud, so that the water in the flow state mud is quickly discharged under additional pressure, thereby achieving the purpose of reinforcing the flow state mud; obviously, this technology belongs to physical technology, such as vacuum negative pressure consolidation technology, heap loading consolidation technology, electro-osmosis technology, etc. The solidification technology is to add solidification agent to the sludge, the solidification agent and the sludge have hydration reaction to produce cementing material, thereby achieving the purpose of reinforcing the soil body; obviously, the solidification method belongs to chemical treatment method. The current solidification agent includes two categories of inorganic and organic polymer. It should be pointed out that the two main methods have defects. Although the vacuum consolidation drainage method and the heap loading consolidation drainage method have low treatment cost, the treatment time is long and the treatment effect is poor. Due to the existence of phenomena such as blockage, the treatment effect is poor. Although the solidification method has fast treatment effect, the treatment cost is high, especially for high water content flow state mud, the amount of solidification agent is large and the price is high. In addition, the incorporation of solidification agent also needs to stir the flow state mud with the solidification agent, which is complex and increases the cost.

[0004] In order to improve the treatment efficiency, the flow state mud is generally first consolidated and drained for pretreatment to reduce the water content, and then the solidification agent is added to the sludge with reduced water content for solidification treatment. However, this method needs to be constructed twice, that is, after the consolidation treatment, the sludge is excavated, the solidification agent is added and stirred, and then the sludge is rolled and filled into the fill area. Obviously, this process will undoubtedly greatly increase the construction cost. SUMMARY

[0005] The present application provides a kind of delay curing agent hydration reaction and flow state mud one-step consolidation-curing method, which solves the defects in the background art, and integrates the traditional heap dredged mud vacuum negative pressure consolidation treatment and the solidification treatment with the addition of solidification agent, which reduces the water content in the dredged mud and reduces the construction cost.

[0006] The technical scheme adopted by the present application to solve its technical problems is:

[0007] A one-step consolidation-curing method for delaying the hydration reaction of a curing agent and the fluid state mud, comprising the following steps:

[0008] In the first step, dredged mud is filled in the yard, and the dredged mud is in a fluid state with high water content.

[0009] In the second step, after the yard is filled with dredged mud, a plurality of drainage bodies are inserted into the yard, and the top of the drainage body protrudes above the surface of the dredged mud and is connected to a vacuum pump through a vacuum pipe.

[0010] In the third step, the vacuum pump is started, and the water in the dredged mud is extracted to the vacuum pipe through the drainage body.

[0011] In the fourth step, the third step is repeated to intermittently extract the vacuum from the dredged mud to complete the vacuum consolidation treatment.

[0012] As a further preferred embodiment of the present application, the aforementioned delayed curing agent comprises a curing agent body, the degradable material is heated to a molten state, the crushed curing agent body is added to the molten degradable material, stirred and mixed, and the delayed curing agent is formed after 12 hours of standing.

[0013] As a further preferred embodiment of the present application, the aforementioned curing agent body is selected from inorganic curing agents or organic curing agents or high molecular curing agents, wherein the inorganic curing agent is selected from cement or lime.

[0014] As a further preferred embodiment of the present application, the aforementioned degradable material is made of polylactic acid material.

[0015] As a further preferred embodiment of the present application, the aforementioned drainage body is formed by bundling straw or weaving straw into a straw rope.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] 1. The present application simultaneously mixes a specially developed delayed curing agent into various types of high water content fluid mud when filling the yard, and the delayed curing agent immediately reacts after vacuum consolidation treatment of the dredged mud, thereby integrating vacuum negative pressure consolidation treatment and curing agent addition for curing treatment.

[0018] 2. The present invention adopts a delayed curing agent, which can reduce construction costs and simplify construction technology without affecting the treatment effect. DETAILED DESCRIPTION

[0019] The present application aims to provide a one-stop consolidation-solidification method for delaying the hydration reaction of a curing agent and fluidized mud, which solves the problem in the prior art that, in order to improve work efficiency, the dredged mud is dredged out after being consolidated and the curing agent is continuously added, resulting in increased construction costs. The specific steps include:

[0020] The first step is to blow dredged mud into the stockpile. At this time, the dredged mud is a fluid mud with a high water content. During the blowing process of the dredged mud, delayed curing agent powder is added. The delayed curing agent powder is deposited together with the soil particles in the dredged mud under the action of its own weight, and gradually accumulates to the bottom of the stockpile to form dredged mud containing delayed curing agent. As for the content of the delayed curing agent powder added, it is determined according to the water content of the dredged mud. If the water content is higher, a larger amount of delayed curing agent is added.

[0021] In the second step, after the yard is filled with dredged mud, a number of drainage bodies are inserted into the yard. The top of the drainage body extends out of the surface of the dredged mud and is connected to the vacuum pump through a vacuum pipe. It should be noted here that there are many structures of the drainage body. In the preferred embodiment, we use straw bundles or straw ropes, because the straw can self-degrade in the dredged mud over time, which is more environmentally friendly. At the same time, the waste straw can be reused to achieve resource regeneration.

[0022] The third step is to start the vacuum pump. At this time, the water in the dredged mud is extracted into the vacuum pipe through the drainage body. When the water in the vacuum pipe is reduced, the vacuum pump is turned off. After 5-10 days, the vacuum pump is restarted to continue to apply negative pressure to the dredged mud. Repeat this several times until no water is discharged from the vacuum pipe.

[0023] The fourth step is to repeat the third step and perform intermittent vacuum treatment on the dredged mud to complete the entire vacuum negative pressure consolidation treatment operation. After 2-3 months, the delayed curing agent powder will undergo hydration reaction in the dredged mud to form cemented silt particles, and finally achieve the curing effect.

[0024] The principle of the delayed curing agent in this application is actually to wrap a layer of degradable material on the surface of an ordinary curing agent. When it enters the dredged mud, it will not react in the initial stage. After the vacuum negative pressure consolidation treatment is completed, the degradable material wrapped on the surface of the curing agent will degrade and disappear, leaving the curing agent exposed in the dredged mud, where it will react with the water in the dredged mud to form a cement, thereby ultimately achieving the curing effect.

[0025] The preparation process of the delayed curing agent is as follows: the degradable material is heated to a molten state, the crushed curing agent body is added into the molten degradable material, the curing agent body and the degradable material are fully contacted by stirring and mixing, the delayed curing agent is formed after being left for 12 hours, and finally the delayed curing agent is crushed to form a delayed curing agent powder.

[0026] The curing agent body is selected from inorganic curing agents or organic curing agents or high polymer curing agents, wherein the inorganic curing agent can be cement or lime; and the degradable material is made of polylactic acid material.

[0027] The delayed curing agent is added when the high water content flowable sludge is generated, the water content of the sludge is continuously reduced during the consolidation treatment process, and when the water content of the dredged sludge is reduced to a certain degree in the later stage of the consolidation treatment, the degradation of the waterproof film on the surface of the delayed curing agent ends, the delayed curing agent is mixed with water to form a cured sludge, the operation is simple, the construction cost is reduced without affecting the consolidation-curing effect, and the method is suitable for wide promotion.

[0028] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless otherwise defined.

[0029] The meaning of "and / or" described in the present application means that each single existence or both existences are included.

[0030] The meaning of "connection" described in the present application can be a direct connection between components or an indirect connection between components through other components.

[0031] Based on the above ideal embodiments according to the present application, the relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the contents of the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A one-stop consolidation and solidification method for delayed curing agent hydration reaction and fluidized mud, characterized by: The following steps are involved: The first step is to blow dredged mud into the stockpile. At this time, the dredged mud is a fluid mud with high water content. During the blowing process of the dredged mud, delayed curing agent powder is added. In the second step, after the yard is filled with dredged mud, several drainage bodies are inserted into the yard. The tops of the drainage bodies extend out of the surface of the dredged mud and are connected to the vacuum pump through vacuum pipes. The third step is to start the vacuum pump. At this time, the water in the dredged mud is extracted into the vacuum pipe through the drainage body. When the water in the vacuum pipe is reduced, the vacuum pump is turned off. After 5-10 days, the vacuum pump is restarted to continue to apply negative pressure to the dredged mud. Repeat this several times until no water is discharged from the vacuum pipe. The fourth step is to repeat the third step and perform intermittent vacuum treatment on the dredged mud to complete the entire vacuum negative pressure consolidation treatment operation. After 2-3 months, the delayed curing agent powder will undergo hydration reaction in the dredged mud to form cemented silt particles, and finally achieve the curing effect; The aforementioned delayed curing agent includes a curing agent body. The degradable material is heated to a molten state, and the crushed curing agent body is added to the molten degradable material. The mixture is stirred and allowed to stand for 12 hours to form a delayed curing agent. Finally, the delayed curing agent is crushed to form a delayed curing agent powder. The principle of delayed curing agent is to coat the surface of ordinary curing agent with a layer of degradable material. When it enters the dredged mud, it will not react in the early stage. After the vacuum negative pressure consolidation treatment is completed, the degradable material coated on the surface of the curing agent will degrade and disappear, leaving the curing agent exposed in the dredged mud. It will react with the water in the dredged mud to form a cement, which ultimately achieves the curing effect. The aforementioned drainage body is formed by bundling straws or weaving straws into straw ropes. The straws can self-degrade in the dredged mud over time, which is more environmentally friendly. At the same time, the discarded straws can be reused to achieve resource regeneration.

2. The one-stop consolidation-solidification method for delayed curing agent hydration reaction and fluidized mud according to claim 1, characterized in that: The aforementioned curing agent body is selected from inorganic curing agent, organic curing agent or polymer curing agent, wherein the inorganic curing agent is selected from cement or lime.

3. The one-stop consolidation-solidification method for delayed curing agent hydration reaction and fluidized mud according to claim 2, characterized in that: The aforementioned degradable material is made of polylactic acid.