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Method for silt soil with ectopic activated magnesium oxide carbonization and solidification

A technology of activated magnesia and solidified sludge, which is applied in soil protection, dehydration/drying/concentrated sludge treatment, construction, etc. It can solve the difficulties in the application of low-permeability sludge engineering, unsuitable for high moisture content sludge, waste of carbon dioxide, etc. problems, to achieve the effect of increasing the scope of application, high integrity, and avoiding escape and waste

Active Publication Date: 2018-05-29
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention is aimed at the problems of poor carbonization uniformity, serious waste of carbon dioxide, and inadaptability to high water content sludge in the existing carbonization reinforcement technology. Homogeneous mixing, sludge granulation, carbon dioxide carbonization, waste gas / waste liquid collection, and resource utilization are several steps to solve the problems of high water content, low permeability sludge engineering application, and carbonization reinforcement, which greatly improves the uniformity of carbonization , the scope of application is wider, aiming to realize the resource reuse of sludge / sludge and carbon dioxide in engineering construction

Method used

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  • Method for silt soil with ectopic activated magnesium oxide carbonization and solidification
  • Method for silt soil with ectopic activated magnesium oxide carbonization and solidification
  • Method for silt soil with ectopic activated magnesium oxide carbonization and solidification

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Experimental program
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Effect test

Embodiment 1

[0033] A method for carbonizing and solidifying silt soil with ex-situ active magnesium oxide comprises the following steps:

[0034] a. Sludge pretreatment: The sludge to be treated is transported to the pretreatment device 1 by a transport vehicle or a mud pump, and the procedures of debris removal, sediment separation and dehydration and volume reduction are carried out in sequence, and the debris removal is mainly for solid debris , such as grass roots and debris bags in the soil, then turn on the sediment separation function, separate the sediment through a mechanical sieve, and finally perform dehydration and volume reduction to separate the pretreated water and soil and store them in the water storage tank 3 and cache bin 4;

[0035] b. Uniform mixing of curing agent: the soil in the buffer storehouse 4 is transported to the metering hopper A8 through the feeder A7, and the first pressure regulating valve 23 and the second pressure regulating valve 24 are opened at the ...

Embodiment 2

[0042] On the basis of Example 1, the soil pretreated in step a obtains the moisture monitoring value through the moisture sensor 6, and the soil, the first curing agent and the second curing agent in step b are respectively equipped with metering sensor A11 and metering sensor B12 and metering sensor C13, first determine the metering sensor A11 to any reference value, then adjust the metering sensor B12 according to the moisture monitoring value, and adjust the metering sensor C13 according to the target strength and hardness of the sludge particles;

[0043] Specifically, the carbonation degree and strength of silt soil are significantly affected by factors such as silt moisture content, clay (fine particle) content, curing agent content, aeration pressure, and carbonization time. Taking the silt soil in Nanjing, Huai'an and Wenzhou as examples, the characteristics of the silt soil in the three places are different, and then the indoor unit experiment of magnesia solidified s...

Embodiment 3

[0055] On the basis of the above embodiments, the solid debris in step a is removed by mechanical rakes or mechanical sieves, and the separation of sediment is mainly through mechanical centrifugation or geotechnical mesh bag barrier, the overall operation is simple and the efficiency is higher;

[0056] The first curing agent can be anhydrous magnesium chloride powder or a powder mixture of anhydrous magnesium chloride and anhydrous calcium chloride, and the second curing agent is active magnesium oxide powder or a powder mixture of active magnesium oxide and calcium oxide. Magnesium is the main curing agent, and the carbonization and reinforcement process can fully absorb a large amount of carbon dioxide gas and avoid environmental pollution as much as possible.

[0057] The lye in step e can be sodium hydroxide solution, which is easy to obtain and has low economic cost, and is convenient and safe to use. The overall method does not require long-term maintenance and can be c...

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Abstract

The invention discloses a method for silt soil with ectopic activated magnesium oxide carbonization and solidification, and belongs to the field of hydraulic and civil engineering. The method includesthe steps of a sludge pretreatment, a uniform mixing of a curing agent, a silt granulation, a carbon dioxide carbonization, a waste gas / waste liquid collection, and a resource utilization. The supplyof the curing agent is regulated by actual measure a water content rate, and a diameter of a grain and a carbon dioxide pressure are regulated according to a soil property, so that a full mixing of the silt and the curing agent and the rapid carbonization of magnesium oxide solidified the sludge grains are realized. Dust and carbon dioxide are absorbed during the operation process to avoid secondary pollution. The method is safe, simple, low in carbon, environmental, and high in continuous operation rate, and the problem of sludge treatment and engineering application is solved. The silt carbonized grains have the advantages of low moisture content, high hardness, high shear strength, large friction coefficient and the like. The silt carbonized grains can be used as a filler such as a roadbed, an airport runway and an engineering backfill, and the reclamation of the slit / sludge and the carbon dioxide is realized. The method for the silt soil with the ectopic activated magnesium oxidecarbonization and solidification has great significance of the engineering construction.

Description

[0001] Field [0002] The invention relates to a method for treating solidified silt soil used for silt produced in river courses, lakes and civil water conservancy projects. In particular, it relates to a method for carbonizing and solidifying mud with ex-situ active magnesium oxide, which is suitable for mud with high water content and low permeability, and realizes resource reuse of mud and carbon dioxide in engineering construction. Background technique [0003] my country has a vast territory, numerous rivers and lakes, and the rapid development of civil engineering construction. During the dredging and dredging of rivers and lakes and the construction of civil and water conservancy projects, a large amount of silt will be produced. These silts have high moisture content, high clay content, poor water permeability, physical Some river and lake silts even contain a large amount of organic matter and harmful heavy metals. It is difficult to directly use them as filling mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/12C02F11/14
CPCC02F11/14E02D3/12E02D3/126
Inventor 刘松玉蔡光华王亮秦川
Owner SOUTHEAST UNIV
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