KR20100128783A - Solidification method of dredged soil and solidification agent for dredged soil - Google Patents

Abstract

PURPOSE: A solidifying method for dredged soil and a solidification agent thereof are provided to control the solidification time in a rapid solidification mode or a batch type solidification mode. CONSTITUTION: A solidifying method for dredged soil comprises a step of mixing 100 parts of dredged soil by weight with 10~30parts of solidification agent by weight using a continuous system parasitic mixer, and a step of aging for 3 days after the solidification process to secure the moisture content less than 45%.

Description

SOLIDIFICATION METHOD OF DREDGED SOIL AND SOLIDIFICATION AGENT FOR DREDGED SOIL

The present invention relates to a method of solidifying dredged soil, a solidifying agent for dredged soil and dredged soil prepared by the above method, and more specifically, a water content of 50 to 80 within 1 to 24 hr depending on the treatment time throughput and working space when dredged soil is dredged. The present invention relates to a solidifying agent (Alec-CH) capable of transporting a dredged soil in a range of% and operating within 45% of a water content, a solidifying method of dredged soil using the solidified agent, and a dredged soil prepared by the method.

Dredging refers to deepening the ground by digging out soil or rocks piled up on the bottom of a river or coast (dictionary meaning). The dredging soil is called dredging soil. The dredged soil which is in the dredged soil treatment plant cannot be used even after 10 years without any treatment and the final plan cannot be established due to the high cost of processing more than KRW 1 million per pyeong and long term processing time of more than 1 year when the soft ground solidification method is applied. to be.

Currently, dredged soils generated from domestic riverbeds, shores, harbor dredged soils, sewage dredged soils, reservoirs, and reservoirs generate more than 1 billion tons as of 2008, and dredged soils generated by dredging and river dredging due to port development every year. It has occurred in large quantities and until recently, most of the dredged soil has been treated by offshore dumping.However, in connection with the London Anti-Dumping Convention in 1996, strengthening of marine dumping conditions and the direct reclamation agreement were enacted in 2012. It is urgent to develop land treatment plans.

In addition, in order to achieve balanced national development and leap to developed countries, the government plans and promotes various national projects such as coastal new towns, ports, and shipbuilding. As an alternative to this, plans are being made to implement industrial complexes using dredged soils and the application of sedimentary materials when constructing new cities, but there are many problems in terms of transporting dredged soils with high water content, water reduction, and years of use. In addition, in order to solve this problem, the government is taking various measures through cutting of cutting and construction wastes, but it is difficult to secure landfill materials due to environmental damage and huge logistics costs.

However, in Korea, dredged soil treatment and recycling, which occurs enormously, remain at the beginning stage, and most of them are dumped and disposed of in a dredged soil dumping site. At present, some dredged soil treatments are attempting to improve the soft ground by mixing and consolidating most of the clay materials. However, the results are insignificant due to the severe shortage of the clay materials and long-term improvement period, and stability problems after construction. Another treatment method is to improve dredged soil by natural drainage and artificial drainage method, which also has a significant effect until now due to stability problems due to the lack of strength after the occurrence and stabilization of pests caused by long-term improvement period. The situation is not harvested.

Dredged soils used in dredging of harbors and river lakes have a high water content of 60-90%, and the improvement time is extended for natural and artificial drainage. In addition, the dredged soil has a low cohesion and permeability requires a long time for soil stability. In addition, when particulate soil particles and suspended organic particles are precipitated, due to low specific gravity and dispersibility, colloids are formed when saturated, which hinders soil stability and causes odors, and decomposes organic matter. Such dredged soils limit soil restoration due to heavy metal contamination. In addition, due to the lack of solidification technology, the amount of hardening agent must be excessively added to such dredged soil, thereby increasing the cost of solidifying. These solidifying agents are usually used in Portland cement, quicklime, hydrated lime, fly ash, bentonite, light weight, activated carbon, silica, slag powder, by-product gypsum, calcium carbonate, and the solidification time is prolonged. There is a problem of poor performance.

Therefore, the present inventors developed a solidifying agent and a dredged soil solidifying method for converting to a soiled and dredged soil after the shortest solidifying time using the minimum solidifying agent in the recycling of a ground material such as a fill material, a cover material, and the like after using the solidifying agent in the dredged soil. In an effort to develop a dedicated solidifying agent for dredged soil by adding meta kaolin as an accelerator to a solidifying agent consisting of CaO ₄ CaO ₄ (1 / 2H ₂ 0), paper incineration ash and aluminum dross, 50% to 80% water content by the solidifying agent transfers dredged soils generated in riverbeds, lakes, harbors and dredged lands in the shortest amount of time according to the processing time, throughput and type of processing space. As a result of the mixed treatment of dredged soil, it was made into 45% water content within 1 ~ 24 hours, and after 3 ~ 4 days after reforming into solidified soil which can be transported and stacked as soil, construction soil and cover material The present invention was completed by confirming that the conversion of dredged soil that can be converted is possible.

It is an object of the present invention to provide a dedicated dredge for custom dredged soil that can contribute to environmental conservation by recycling resources, and a solidification treatment method using the solidified agent, and dredged soil prepared by the method.

In order to solve the above problems, the present invention is added to 10 parts by weight of the dedicated solidifying agent (Alec-CH) for dredged soil to 100 parts by weight of dredged soil of 50 to 90% of water content using a continuous vortex type mixer and the dredged soil and high It provides a method of solidifying dredged soil, characterized in that to produce a dredged soil having a water content of 45% or less within three days after the mixed solidification treatment in a mixing system for continuously mixing the agent.

In addition, the present invention is a material selected from the group consisting of powders of paper incineration ash, aluminum dross (Al / dross), a promoter of meta kaolin and CaSO ₄ series (half gypsum, dihydrate gypsum, anhydrous gypsum) Provided is a dedicated solidifying agent (Alec-CH) for dredged soil, which is a mixture of four.

In addition, the present invention provides a dredged soil prepared by the solidification method of the dredged soil.

Hereinafter, the present invention will be described in more detail.

The present invention minimizes the inconvenience of single or two-stage mixing using calcium alumino ferrite (C ₄ AF) and sulfate strong alkali material presented in our previous patent (Application No. 10-2007-0032765, dredging solidification method) It is an improved hardener and dredged soil solidification method that reduces working time by minimizing solidification time of dredged soil with high water content.

The present invention is a mixing system for continuously mixing the dredged soil and the solidifying agent by adding 10 to 30 parts by weight of the dedicated solidifying agent (Alec-CH) for dredged soil to 100 parts by weight of dredged soil having a water content of 50 ~ 90% using a continuous vortex mixer (Mixing System) provides a method of solidifying the dredged soil, characterized in that to produce a dredged soil having a water content of 45% or less within 3 days after the mixed solidification treatment.

In the method of solidifying the dredged soil of the present invention, the solidifying agent is preferably added to the continuous vortex mixer (Mixer) inlet using a flow rate, the dredged soil is preferably 50 to 80% of the water content, the solidification treatment is It is preferable to be made within 1 to 42 hours, and more preferably to be made within 1 to 3 hours.

In addition, in the method of solidifying the dredged soil of the present invention, the dedicated hardener for dredged soil (Alec-CH) is the paper incineration ash, aluminum dross so that the mixing ratio can be adjusted differently according to the curing time, work amount, treatment space, treatment time. (Al / dross), meta-kaolin (accelerator) and CaSO ₄ series (half gypsum, dihydrate gypsum, anhydrous gypsum) powders, preferably CaO ₄ (1 / 2H ₂ 0) 20 It is more preferable that it contains -60 weight part, paper incineration ash 20-60 weight part, 10-45 weight part of aluminum dross, and 3-10 weight part of meta kaolin which is an accelerator. The aluminum dross is preferably an aluminum waste dross having a metal content in the range of 5% to 40% as waste residue generated in the aluminum melting process, and the paper incineration ash is a dry powder generated by incineration of waste sludge generated in a paper mill. Preferably, the CaSO ₄ series material is CaSO ₄ (1 / 2H ₂ 0) powder, which is dry-pulverized with at least Brain 2000 in which dry gypsum of a chemical plant, desulfurization gypsum of a power plant, and CaO-based waste catalyst are dried on a semi-manganese solid. It is preferred that the material is selected from the crowds made up.

In addition, in the method of solidifying the dredged soil of the present invention, the method of solidifying the dredged soil 250 ~ 350 kg by adding the dedicated solidifying agent for the dredged soil per 1 m 3 of the dredged soil having a water content of 50 to 80% when the space for solidification work is narrow 1 It is solidified to be transported within 3 hours and used for emergency construction, or when the space of solidification work is large, 150 ~ 250 ㎏ of dredged soil dedicated solidifier per 1 ㎥ of the dredged soil having a water content of 50 to 80% is added within 40 to 24 hours. It is desirable to produce dredged soils that can be stored with a moisture content of less than%.

Further, in the dredged soil solidification method of the present invention, the solidified work of the dredged soil is preferably a solidification treatment selected from the crowd consisting of rapid solidification treatment, continuous solidification treatment and batch type solidification treatment according to the work space and throughput. Do. The rapid solidification treatment indicates the preparation of solids capable of loading W / T 40-50% after 1 to 3 hours of mixing dredged soil having a water content of 50 to 80% and solidification agent. If there is a port (storage facility, storage building) that can store dredging volume, it is possible to accumulate and transport after 12 hrs after solidification using continuous vortex mixer (Mixer) when dredging soil and solidifying agent It is a method of producing a solidified body, the batch-type solidification treatment is a method of treating the solidified soil within 24 hours after storage in a storage tank after mixing 1 ~ 2 ㎥ per unit using a fixed equipment (fixed mixer).

The dredged soil used in the present invention may be any material generated when dredging ports, rivers, sewage, lakes, reservoirs and reservoirs.

In addition, the present invention is for dredged soil mixed with 1 to 4 materials selected from the group consisting of a powder of paper incineration ash, aluminum dross (Al / dross), Mata Koiln and CaSO ₄ series (half gypsum, dihydrate gypsum, anhydrous gypsum) A dedicated solidifying agent (Alec-CH) is provided.

The dredge soil solidifying agent (Alec-CH) of the present invention can be customized solidification treatment that can adjust the mixing ratio according to the environmental conditions, such as dredged soil treatment time, throughput, work space. In particular, it is a solidifying agent which can adjust the curing (solidification) time artificially. It is a four-component solidifying agent consisting of paper ash, gypsum-based (CaSO ₄ (1 / 2H ₂ O), aluminum dross, and metakaolin. It is a customized hardener containing unique physical properties such as moisture reduction and strength development, and it is an environmentally friendly hardener that can change the compounding ratio fluidly according to the solidification method after dredging.

Dedicated solidifying agent (Alec-CH) for dredged soil of the present invention is CaO ₄ CaSO ₄ (1 / 2H ₂ 0) 20 to 60 parts by weight, paper incineration ash 20 to 60 parts by weight, aluminum dross 10 to 45 parts by weight And 3 to 10 parts by weight of meta kaolin, which is an accelerator, wherein the rapid solidifying agent is 40 to 60 parts by weight of CaSO ₄ (1 / 2H ₂ O), 20 to 40 parts by weight of paper incineration ash, and aluminum. More preferably, it contains 25 to 45 parts by weight of dross and 5 to 10 parts by weight of meta kaolin, and the continuous solidifying agent is 40 to 60 parts by weight of CaSO ₄ (1 / 2H ₂ O), paper incineration ash 30 It is more preferable to include 50 parts by weight, 20 to 30 parts by weight of aluminum dross and 5 to 10 parts by weight of meta kaolin, and the batch type solidifying agent is 20 to 40 of CaSO ₄ (1/2 H ₂ O). It is preferable to include a weight part, paper incineration ash 40 to 60 parts by weight, 10 to 30 parts by weight of aluminum dross and 3 to 8 parts by weight of meta kaolin.

At this time, the rapid solidifying agent (Alec-CH 100) is put into 250 ~ 350 ㎏ per 1 m 3 to dredged soil with a water content of 50 ~ 80%, transported within 1 to 3 hours, can be worked as a solid soil of 45% water content possible It is a topic. In addition, continuous solidifying agent (Alec-CH 200) is put into 200-300 kg per 1 m 3 of dredged soil with a water content of 60-80%, and is transported within 12 hours. to be. In addition, batch-type solidifying agent (Alec-CH 300) is put into 150 to 250 kg per 1 m 3 to dredged soil having a water content of 60 to 80%, and transported within 24 hours. to be.

Dredged soil solidifying agent (Alec-CH) of the present invention is a dredged soil dedicated solidifying agent that can be treated in a short time from the minimum water content of 40% (water content of 66.7) to the maximum water content of 90% (water content of 900) through drying, grinding and mixing process As a powder solidifying agent, it is a factory-type solidifying agent that can change the blending ratio depending on the dredged soil water content, daily throughput, daily working time, and large and small working spaces.

In addition, the present invention provides a dredged soil prepared by the solidification method of the dredged soil.

The dredged soil of the present invention is preferably used as a soil or cover material for soil, building materials.

As described above, the dredged soil dedicated solidification agent (Alec-CH) of the present invention and the dredged soil solidification treatment method using the same, it is possible to adjust the curing solidification time of various time zones such as rapid solidification, continuous solidification, batch solidification, and at least 1 hr. 50 ~ 80% water content of dredged soil within 12 hrs and 24 hrs can be accumulated and transported within 45% of water content, and can be recycled with high quality soil and soil cover material after 3 ~ 4 days of age. And the use of abandoned resources can contribute to maximum efficiency and environmental conservation.

Hereinafter, the present invention will be described in more detail based on the following examples. However, the following examples are only for illustrating the present invention, and the present invention is not limited to the following examples, and may be changed to other embodiments equivalent to substitutions and equivalents without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art to which the present invention pertains.

Preparation Example Preparation of Exclusive Hardener for Dredged Soil

The inventors have prepared a dedicated solidifying agent (Alec-CH) for dredged soil consisting of CaSO ₄ (1 / 2H ₂ 0), paper incineration ash, aluminum dross and an accelerator. The CaSO ₄ (1 / 2H ₂ 0) is dry pulverized by Brain 2000 or more, the paper incineration ash is a dry powder generated by incineration of waste sludge generated in the paper mill, aluminum dross is generated in the aluminum melting process The waste residue is aluminum waste dross with a metal content in the range of 5% to 40%. Specifically, a rapid solidifying agent, a continuous solidifying agent, and a batch solidifying agent were prepared in the compositions of Table 1, respectively.

division CaSO ₄ (1 / 2H ₂ 0) Paper incineration society Al-Dross Meta kaolin Rapid solidification 50 g 30 g 35 g 7 g Continuous solidifying agent 50 g 40 g 25 g 7 g Batch hardener 30 g 50 g 20 g 5 g

≪ Example 1 >

After the addition of 10, 20, and 30 parts by weight of Alec-CH as a binder to 100 parts by weight of dredged soil having a water content of 56.20%, the change in moisture content over time was measured. Mixing of the dredged soil and the solidifying agent was used as a mixing system (Mixing System) for continuous mixing by using a continuous vortex mixer (Mixer), the solidified material for the dredged soil was added to the continuous vortex type mixer by using a flow rate. . The results are shown in Table 2 below.

division Dredge Solidifying agent Compounding ratio (dredged soil: solidifying agent) theory
Moisture content 1 hr
lapse 3 hr
lapse 1 day
lapse 3 days
lapse S-1 W / T: 56.20% Alec-ch 100: 10 51.1% 48% 46.4% 39.1% 24.2% Function ratio (ω): 128 104.5 90.8 86.6 64.2 31.9 S-2 W / T: 56.20% Alec-ch 100: 20 46.8% 45.7% 44.70% 38.20% 26.9% Function ratio (ω): 128 88.0 84.2 80.8 61.8 36.8 S-3 W / T: 56.20% Alec-ch 100: 30 43.2% 40.0% 38.3% 33.7% 17.7% Function ratio (ω): 128 76.1 66.7 62.1 50.8 21.5

<Example 2>

After adding 20 and 30 parts by weight of Alec-CH as a hardening agent, respectively, to 100 parts by weight of dredged dredged soil having a water content of 76.46%, the moisture content change over time was measured. Mixing of the dredged soil and the solidifying agent was used a mixing system for continuous mixing using a continuous vortex mixer, and the dredged solidifying agent was added to the continuous vortex type mixer by using a flow rate. The results are shown in Table 3 below.

division Dredge Solidifying agent Mixing Ratio (Dredged Soil: Binder) Theoretical water content 3 hr elapsed 1 day past 2 days S-1 Moisture content
: 76.46% Alec-ch 100: 20 63.7% 58.6% 50.6% 43.8% S-2 Water content ratio (ω)
: 324.8 100: 30 58.8% 50.6% 45.0% 41.3%

<Example 3>

After adding 30 parts by weight of Alec-CH, a hardening agent, to 100 parts by weight of dredged dredged soil having a water content of 88.57%, the water content change over time was measured. Mixing of the dredged soil and the solidifying agent was used a mixing system for continuous mixing using a continuous vortex mixer, and the dredged solidifying agent was added to the continuous vortex type mixer by using a flow rate. The results are shown in Table 4 below.

division Dredge Solidifying agent Mixing ratio (Dr. soil:
Solidification) 3 hr
lapse 20 hr
lapse 42 hr
lapse S-3 Moisture content
: 88.57% Alec-ch 100: 30 54.31% 46.10% 43.10% Water content ratio (ω): 775 119 85.5 75.7

<Example 4>

After adding 20 and 30 parts by weight of Alec-CH, a hardening agent, to 100 parts by weight of dredged soil having a water content of 90.74%, the moisture content change over time was measured. Mixing of the dredged soil and the solidifying agent was used a mixing system for continuous mixing using a continuous vortex mixer, and the dredged solidifying agent was added to the continuous vortex type mixer by using a flow rate. The results are shown in Table 5 below.

division Dredge Solidifying agent Compounding ratio (dredged soil: solidifying agent) 3 hr
lapse 20 hr
lapse 42 hr
lapse S-1 Water content: 90.74%

Water content ratio (ω): 980 Alec-ch 100: 20 57.57% 53.04% 50.10% 136 112.9 100.4 S-2 100: 30 69.80% 57.57% 53.04% 172 139.5 115.5

In the dredged soil having a water content of 50 to 80% in the above measured values, the dredged soil solidification work can be carried out compatible with 10, 20, 30 parts by weight of the dredged solidifying agent, respectively, depending on the throughput and processing time based on 100 parts by weight of the dredged soil. In the case of dredged soil solidification work over 88% water content, it was confirmed that smooth solidification work only when the solidification agent is added more than 30 parts by weight. In addition, dredged soil solidification work in the range of 50 ~ 80% of water content can be confirmed that transfer solidification work is possible within the shortest 1 ~ 3hr.

1 is a photograph showing the moisture content change over time after adding 10, 20, 30 parts by weight of Alec-CH as a hardening agent to 100 parts by weight of dredged dredged soil having a water content of 56.20% of Example 1, respectively.

2 is a photograph showing the change in moisture content over time after adding 20 and 30 parts by weight of Alec-CH, which is a hardening agent, to 100 parts by weight of dredged dredged soil having a water content of 76.46% of Example 2, respectively.

3 is a photograph showing the change in moisture content over time after adding 30 parts by weight of Alec-CH, a hardening agent, to 100 parts by weight of dredged dredged soil having a water content of 88.57% of Example 3.

FIG. 4 is a photograph showing the change in moisture content over time after adding 20 and 30 parts by weight of Alec-CH, which is a hardening agent, to 100 parts by weight of dredged dredged soil having a water content of 90.74% of Example 4. FIG.

Claims (15)

Mixing system that continuously mixes the dredged soil and the solidifying agent by adding 10-30 parts by weight of the dedicated solidifying agent (Alec-CH) for dredged soil to 100 parts of the dredged soil having a water content of 50 to 90% by using a continuous vortex mixer. The method of solidifying dredged soil, characterized in that to produce a dredged soil having a water content of 45% or less within 3 days after the mixed solidification treatment. The method of claim 1, wherein the dredged soil is 50 to 80% water content. The method of claim 1, wherein the solidification treatment is carried out within 1 to 24 hours. The method of claim 1, wherein the solidifying agent is introduced into the continuous vortex mixer (Mixer) by using a flow rate. The method of claim 1, wherein the dedicated hardening agent (Alec-CH) for dredged soil is paper incineration ash, aluminum dross (Al / dross), so that the mixing ratio can be adjusted differently according to the curing time, work amount, processing space, treatment time A method of solidifying dredged soil comprising a powder of meta kaolin and CaSO ₄ series (half gypsum, dihydrate gypsum, anhydrous gypsum). According to claim 5, The dedicated dredge (Alec-CH) for dredged soil is CaO-based CaSO ₄ (1 / 2H ₂ 0) 20 to 60 parts by weight, paper incineration ash 20 to 60 parts by weight, aluminum dross 10 ~ 45 parts by weight and metakaolin (meta kaolin) 3 to 10 parts by weight solidification method of dredged soil characterized in that it comprises. According to claim 1, The method of solidification of the dredged soil is 250 ~ 350 kg of dredged soil dedicated solidifier per 1 m 3 of the dredged soil having a water content of 50 ~ 80% when the space of the solidification work is narrow to transport within 1 to 3 hours It can be solidified to be used for emergency construction, or when the space for solidification work is large, 150 ~ 250 ㎏ of dredged soil dedicated solidifying agent is added per 1 ㎥ of dredged soil having a water content of 50 to 80% and reduced to a water content of 40% or less within 24 hr. A method of solidifying dredged soil, characterized in that to produce a dredged soil capable of loading. The method of claim 1, wherein the dredged soil is solidified by a method selected from the group consisting of rapid solidification treatment, continuous solidification treatment and batch type solidification treatment according to the work space and throughput. Solidification method. A dedicated hardener for dredged soil comprising powder of paper incineration ash, aluminum dross, meta kaolin, and CaSO ₄ series (half gypsum, dihydrate gypsum, anhydrous gypsum). 10. The method according to claim 9, wherein the dedicated dredge (Alec-CH) for dredged soil is 20 to 60 parts by weight of CaSO ₄ (1 / 2H ₂ 0) of CaO series, 20 to 60 parts by weight of paper incineration ash, aluminum dross 10 ~ A dedicated hardener for dredged soil comprising 45 parts by weight and 3 to 10 parts by weight of meta kaolin. The method of claim 10, wherein the solidifying agent is 40 to 60 parts by weight of CaSO ₄ (1 / 2H ₂ O), 20 to 40 parts by weight of paper incineration ash, 25 to 45 parts by weight of aluminum dross and meta kaolin 5 A dedicated solidifying agent for dredged soil, characterized in that a rapid solidifying agent containing ~ 10 parts by weight. The method of claim 10, wherein the hardening agent is 40 to 60 parts by weight of CaSO ₄ (1 / 2H ₂ O), 30 to 50 parts by weight of paper incineration ash, 20 to 30 parts by weight of aluminum dross and meta kaolin 5 A dedicated solidifying agent for dredged soil, characterized in that the continuous solidifying agent containing ~ 10 parts by weight. The solidifying agent of claim 10, wherein 20 to 40 parts by weight of CaSO ₄ (1 / 2H ₂ O), 40 to 60 parts by weight of paper incineration ash, 10 to 30 parts by weight of aluminum dross and meta kaolin 3 A dedicated solidifying agent for dredged soil, characterized in that the batch type solidifying agent containing ˜8 parts by weight. Dredged soil prepared by the method of any one of claims 1 to 12. 15. The dredged soil according to claim 14, wherein the dredged soil is used as a soil or cover material for soil and building materials.

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