KR101619778B1 - Reclamation method - Google Patents
Reclamation method Download PDFInfo
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- KR101619778B1 KR101619778B1 KR1020140020507A KR20140020507A KR101619778B1 KR 101619778 B1 KR101619778 B1 KR 101619778B1 KR 1020140020507 A KR1020140020507 A KR 1020140020507A KR 20140020507 A KR20140020507 A KR 20140020507A KR 101619778 B1 KR101619778 B1 KR 101619778B1
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- South Korea
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- gypsum
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- desulfurization
- incineration residue
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
[0001] The present invention relates to a method for embedding a water surface, and more particularly, to a method for embedding an anthracite gypsum in a layered manner in an alternating manner without mixing with an anthracite gypsum.
The method of the present invention includes 1) 1 to 30 parts by weight of a blast furnace slag fine powder and 1 to 70 parts by weight of a furnace desulfurization-type fluidized bed boiler incineration residue having a CaO content of 20 to 70% by weight, based on 100 parts by weight of a phosphate gypsum, To produce a phosphate gypsum bed frit; 2) laying the phosphate gypsum bed frit on a common water surface; And 3) placing the soil on top of the phosphate gypsum bedding land.
Description
[0001] The present invention relates to a method for embedding a water surface, and more particularly, to a method for embedding an anthracite gypsum in a layered manner in an alternating manner without mixing with an anthracite gypsum.
Various kinds of materials are used for various construction works, and the most of them are consumed the most, and the materials used in various fields as basic essential materials are embossed materials. As the embankment material, soil which is a natural material in almost all fields has been used up to now. Generally speaking, the soil mentioned in the construction includes silt, clay, sand and gravel. The embankment is made over the whole construction works such as civil engineering, construction work, road construction and landscape construction. The embankment materials are earthworks, site facility construction, facility construction, designation and foundation work, It is used for base construction, site construction, suspension construction, and landscape pavement construction.
Although the cost of forest restoration is high after the development and use of the deodorization plant, restoration of the natural environment such as the unstable condition is practically difficult, and the cost of the buried construction cost is also increasing.
In recent years, some artificial embankment materials have been used as a countermeasure, but most of them are simple substitutes replacing only a small amount of existing embankment materials, or mixed with cement or fireproof materials in existing embankment materials or used as embankment cement blocks or concrete blocks But also waste concrete such as waste concrete and construction waste materials such as waste asphalt are also considered, but there are still problems that can not be solved in terms of conservation of natural environment and economical efficiency. Therefore, it is urgent to develop a new embankment material which can replace the existing clay material, natural soil material.
In recent years, the embankment method in which industrial wastes such as various steel slag, waste concrete, and waste rubber are replaced with natural soil is adopted at many construction sites. This method is characterized by the ability to reduce natural soil at the same time as the treatment of industrial wastes, but it is not possible to be sure about the mechanism of immobilization due to the dissolution of harmful substances against physical substitution.
In order to prevent this, the method of increasing the cementation strength by using Portland cement is most widely used. This is because it can improve the strength of cementitious clay and reduce secondary pollution caused by the release of harmful substances. However, the practical use of portland cement is not economical. Therefore, the method of cementing the embankment using such cement is disadvantageous from the economical point of view.
In order to minimize the burden on companies, the Ministry of Environment clarified unreasonable regulations and expanded the scope of recycling in order to promote recycling of wastes, clarifying the basis for proper management. In other words, when used as an embankment in landfills or landfill sites that are licensed for a shared landfill under the Waste Management Act, it may be necessary to manufacture and use a shared landfill in the case of mixing more than 70% There is still a concern about environmental pollution problems such as the negative recognition of waste and leaching of harmful components that may exist in phosphorus gypsum, and there is almost no practical use in the field.
In addition, the method of directly mixing the gypsum with the gypsum plaster involves a problem that the economical efficiency is insufficient since a separate mass mixing facility is required.
On the other hand, phosphate gypsum produced in phosphate fertilizer factory does not have economic value, but it is a very strong acidic substance with pH 2 ~ 3 and contains some heavy metals (Cr, Cd) and radioactive materials (radon) It is classified as general waste. Domestic phosphorus gypsum is discharged about 2.35 million tons per year, most of which are in the process of being unused, and most of them are placed in the seam. In addition, the gypsum stocks of fertilizer companies such as N Co., Ltd. have narrowed to near saturation, and as the amount of high quality desulfurization gypsum from power plants and petrochemical plants increases, the utilization rate of phosphorus gypsum is gradually decreasing. The cumulative volume is about 30 million tons.
On the other hand, mud sludge is a byproduct such as turbid water and stone dust generated in construction sludge, stone and aggregate plant. In order to improve the quality of the product, the mud and minerals attached to the ceramics are removed by using washing water. In this case, It refers to muddy water after washing, which includes particles or clay. The turbid water is concentrated and dehydrated by the mechanical equipment for thickening and dewatering such as concentrator and filter press, or by the precipitation knowledge facility and separated from water, and becomes silica sludge containing silica and containing water. Such mud sludge is not always available in large quantities, and therefore it can not be expected to increase the amount of the used sludge. The crushed stone is classified into a dry classifier such as an air separator in order to remove the above-mentioned fine particles of 75 μm or less from the crushed stone crushing plant to a crushed product having a particle size of 5 mm or less, and the average particle size 15 Mu m. The development of this limestone as a substitute for limestone, which is a mixed material of high-strength concrete, has progressed, but the amount used is less than that of limestone powder. In the present situation, to be.
We have also developed dredging technology for dredging onitto to utilize recycled materials effectively in terms of stream maintenance, Saemangeum landfill, cleanup project, construction cost reduction, effective use of land and port construction, This is a big issue.
Construction sludge refers to excavated material in the form of fine muddy water with a high moisture content accompanied with civil engineering construction such as continuous wall method, muddy waterproofing method, high pressure spraying method, and anti-ballast method. Most of such dredged soil treated sewage and construction sludge are not only mud cakes because of their viscous effects, but also useful processes that are linked to the reduction of waste from the viewpoint of environmental health are strongly demanded.
The mud sludge, dredged onion, and construction sludge have characteristics very similar to those of natural soil, but they are not easily utilized as embankment materials because of their high on-site water content, low shear strength, and high compressibility. Therefore, it is necessary to develop a method to improve or reinforce the characteristics as embankment material. As a dehydrating material, it is possible to use the embankment as a embankment by producing abundant water quality by abruptly reducing water content.
Construction waste is a low grade soil that separates recycled aggregate from construction waste such as waste concrete, and is strongly alkaline.
In Europe and Japan, there are many examples of reuse as an active embankment even in the case of waste containing not only the wastes specified in the Domestic Waste Management Act but also some other harmful substances. However, industrial wastes containing harmful substances are solidified with cement and lime, and secondary environmental pollution to them is blocked and then reused as asphalt road pavement, cement stabilization and soil improvement agent.
SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide an eco-friendly shared water surface landfill method utilizing circulation resources which are alternately installed in a layered manner without mixing ansan gypsum and soil.
Another object of the present invention is to provide a method for preventing the dissolution of harmful substances present in the phosphate gypsum and enhancing the cement strength and neutralization by utilizing the blast furnace slag fine powder and the incineration residue of the fluidized bed boiler in the furnace. .
In order to accomplish the above object, the present invention provides a method for reclaiming water from a surface of a furnace slag, comprising the steps of: 1) mixing 1 to 30 parts by weight of a blast furnace slag powder with 100 parts by weight of a phosphate gypsum; 1 to 70 parts by weight of an incineration residue is homogeneously mixed to prepare a phosphate gypsum filler; 2) laying the phosphate gypsum bed frit on a common water surface; And 3) disposing a soil layer filler on top of the phosphate gypsum layer landfill.
In addition, it is preferable that the incineration residues of the in-bed desulfurization type fluidized bed boiler are obtained from a fluidized bed combustion boiler desulfurization process in which any one selected from petro coke or bituminous coal, or a mixture of two or more thereof is used as fuel and limestone is mixed for desulfurization in the furnace.
In addition, it is preferable that a dehydrating material is further included in order to rapidly decrease the moisture content of the soil layer reclaimed land and improve water permeability. It is preferable that the dehydrating material is included in an amount of 1 to 100 parts by weight based on 100 parts by weight of the soil.
It is preferable that the dehydrating material is any one or a mixture of two or more selected from the group consisting of fly ash, bottom ash, biomass incineration residue, paper sludge incineration residue, waste concrete fine powder, steel slag dust and KR dust.
Also, it is preferable that the soil material constituting the soil layer reclaimed soil is any one or a mixture of two or more selected from general soil, dredged soil, mud sludge and soil recycled from construction waste materials.
According to the present invention, it is possible to greatly reduce the initial facility investment cost by installing the anthracite gypsum in a layered manner alternately without mixing and installing the gypsum.
Also, by utilizing the blast furnace slag powder and the incineration residue of the fluidized bed boiler in the furnace, it is possible to prevent the elution of harmful substances that may be present in the phosphoric acid gypsum, and to enhance the cementation strength and to neutralize it. As a result, it is environmentally stable while exhibiting superior performance over that of general embankment and soil materials.
In addition, the water content of the soil can be rapidly reduced by using industrial byproducts.
Hereinafter, the method of embedding the water surface according to the present invention will be described in detail.
In the use of the soil and phosphate gypsum in the embankment of the area or the landfill site where the landfill license is granted according to the present invention, the phosphate gypsum layer landfill construction step, the phosphate gypsum layer landfill construction step, the upper part of the phosphate gypsum layer landfill And a step of disposing a soil layer deposit on the soil. In this way, the phosphate gypsum layer is buried and the buried soil layer is alternately buried. Since the landfill and phosphate gypsum beds are alternately laid out in a layered manner, the initial facility investment cost can be greatly reduced as compared with the method in which the soil and phosphate gypsum are mixed and installed.
It is preferable that the soil material constituting the soil layer filling land is any one or a mixture of two or more selected from general soil, dredged soil, mud sludge and soil recycled from construction waste materials.
In addition, the phosphate gypsum bedfill is prepared by homogeneously mixing 1 to 30 parts by weight of fine blast furnace slag and 1 to 70 parts by weight of incineration residues in a furnace desulfurization type fluidized bed boiler having a CaO content of 20 to 70% by weight, based on 100 parts by weight of gypsum phosphate do.
The furnace desulfurization-type fluidized bed boiler incineration residue is preferably obtained from a fluidized bed combustion boiler desulfurization process in which any one selected from petro coke or bituminous coal or a mixture of two or more is mixed as a fuel and limestone is mixed for desulfurization in the furnace.
In the production of the clay soil according to the present invention, the incinerator residue and the phosphate gypsum serve as a stimulant for the fine powder of the blast furnace slag in the furnace desulfurization type fluidized bed boiler with a CaO content of 20 to 70 wt%, thereby generating a large amount of hydrate, , Neutralization treatment, and preventing the release of harmful substances.
Blast furnace slag powder used in the present invention is suitably of powder Fig 3,000cm 2 / g to about 6,000cm 2 cm 2 / g as the blast furnace slag has a latent hydraulic.
Blast furnace slag is an industrial by-product generated in various metal smelting processes, and its application and method are very similar to coal ash. Particularly, in the case of slag made into fine powder, slag has potential hydraulic properties and is widely used in cement and concrete fields.
The blast furnace slag powder itself does not hydrate when it comes into contact with water, but has the property of being hardened by hydration reaction when added with a stimulant such as hydroxide or sulfate. When a stimulus, such as a strongly alkaline substance such as calcium hydroxide or sulphate exists as cutting irregular three-dimensional linear combination of the blast-furnace slag that has been enveloped in the internal network structure, Ca 2+, Mg 2 +, Al 3 + , etc. Formula ions are eluted furnace A substance that exerts such an action to promote the hydration reaction of slag is generally referred to as a stimulant.
In the present invention, phosphate gypsum containing impurities harmful to the environment and potentially containing various pollution sources, and incinerator residue in a furnace-desulfurized fluidized bed boiler having a CaO content of 20 to 70% by weight are used as a stimulant for blast furnace slag By neutralizing and solidifying phosphoric acid gypsum by their own hydraulic properties, satisfying all the characteristics of the landfill and secondary environmental pollution can be prevented.
The major minerals produced by the hydration reaction of these blast furnace slag powder, phosphate gypsum and CaO content 20 ~ 70 wt% in the furnace desulfurization type fluidized bed boiler incineration residues are the combined stimulus of alkaline and sulphate and phosphoric acid gypsum sulphate When the glassy film of the slag is broken, the ions eluted from the inside of the slag are mutually reacted to form ettringite, and the remaining components of the slag slowly form a gelatinous CSH-based hydrate, thereby exhibiting strength. The incineration residues in the furnace desulfurization type fluidized bed boiler perform not only the simple stimulation but also the binding agent reacting with the slag.
The blast furnace slag powder is preferably 1 to 30 parts by weight based on 100 parts by weight of the gypsum powder. If the blending amount of the blast furnace slag is less than 1 part by weight, the strength development effect is insignificant. If the blending amount is more than 30 parts by weight, the strength is excessively high.
The flue gas desulfurization type flue gas desulfurization type flue gas desulfurization flue gas desirably has a specific surface area of 2,000 cm 2 / g to 5,000 cm 2 / g, preferably 1 to 70 parts by weight per 100 parts by weight of the phosphate gypsum. When the flue gas concentration is less than 1 part by weight, Is less than 70 parts by weight, the pH is relatively increased, and the powder amount is relatively increased and may be scattered.
In the furnace desulfurization-type fluidized-bed boiler incineration residues, the limestone contained in petro coke and bituminous coal reacts with the decarbonated CaO component at high temperature in the process of mixing limestone for the desulfurization of the furnace in Petro coke or bituminous coal-fired boiler It acts as a complex substance of the generated quicklime and gypsum to neutralize strongly acidic phosphate gypsum with a strong alkaline substance having a pH of 11.5 or more. Further, the blast furnace slag fine powder is activated by a combination of sulfates and alkali complex stimuli of the incineration residue of the fluidized- Potential hydraulics are initiated and cemented strength is manifested.
It is preferable to further include a dehydrating material for rapidly reducing the moisture content of the soil and improving the water permeability through volume expansion. It is preferable that the dewatering material is any one or a mixture of two or more selected from the group consisting of fly ash, bottom ash, biomass incineration residues, paper sludge incineration residues, waste concrete fine powders, steel slag dust and KR dust.
It is preferred that the fly ash and bottom ash are discharged from a thermal power and cogeneration plant. In particular, from the viewpoint of economy, it is preferable to use a fly ash having a heat loss of 5% or more which is difficult to be used as a concrete admixture. Bottom ash is a porous material that absorbs moisture and improves the permeability of the landfill.
It is preferable that the biomass incineration residue is discharged from a cogeneration power plant using biomass such as waste wood chip as fuel.
It is preferable that the paper sludge incineration residue is incinerated and discharged from the papermaking factory during the papermaking process.
It is preferable that the waste concrete fine powder is a fine powder having a diameter of 2 mm or less, which is discharged when the waste concrete is recycled to produce the recycled aggregate.
In addition, steelmaking slag dust is dust that is collected when the slag, which is a byproduct of the steelmaking process, is crushed. Since the slag dust collected in the dust collector contains a large amount of CaO and FeO components, it can not be used as a concrete admixture because of absorption, heat and expansion characteristics.
KR dust is used in KR (Kanvara Reactor) desulfurization process which accelerates the desulfurization reaction by mixing an impeller in the steelmaking process and rotating the impeller during the steel making and refining process to mix the desulfurizer (quicklime, dolomite) It is a strongly alkaline substance with a CaO content of 40 to 70% by weight and a pH of 11.0 to 12.9.
The dehydrating agent is preferably mixed with 1 to 100 parts by weight with respect to 100 parts by weight of the soil. If the amount of the dehydrating agent is less than 1 part by weight, the dehydration effect is insufficient. If the amount is 100 parts by weight or more,
Hereinafter, the present invention will be described in detail by way of examples.
In order to alternately install the conventional embankment material for construction work and the gypsum and plaster layer of gypsum layer alternately with a certain thickness, first, a phosphate gypsum layer, which is prepared by mixing blast furnace slag powder and incineration residue of a fluidized- The landfill was prepared and mixed with dehydrated material in dormant soils of high water content. The performance was verified by modified CBR evaluation.
≪ Example 1 >
First, 10 parts by weight of a blast furnace slag fine powder and 10 parts by weight of incineration residue discharged from an in-bed desulfurization type fluidized bed boiler using petroleum coke as a fuel were mixed with 100 parts by weight of gypsum phosphate (13% water content) Respectively. Subsequently, 30 parts by weight of the paper sludge incineration residue was mixed with 100 parts by weight of the dredged soil having a water content of 85% to prepare a ground layer reclaimed land, which was alternately laid.
≪ Example 2 >
First, 15 parts by weight of a blast furnace slag fine powder and 20 parts by weight of incineration residues discharged from an in-bed desulfurization type fluidized bed boiler made of bituminous coal were mixed with 100 parts by weight of gypsum of a gravel state (water content 13%) to prepare a phosphate gypsum layer . Then, 30 parts by weight of steelmaking slag dust was mixed with 100 parts by weight of mud sludge having a water content of 85% to prepare a soil layer filler, which was alternately laid.
≪ Comparative Example 1 &
Only the natural granular weathered soil was laid at the same height.
The experimental results of the above-mentioned examples are shown in Table 1 below. The experiment was carried out 28 days after the landfill was installed on the site.
As shown in Table 1, the modified CBR, which means the target value of the strength of the roadbed material in the field, was equal to or higher than that of the natural granular weathered soil (Comparative Example 1) as in Examples 1 and 2. The reason is that the blast - furnace slag powder reacts with gypsum and in - furnace desulfurization - type fluidized - bed boiler incineration residues to prevent hydration, so it can improve the performance compared to natural granular weathered soils. The modified CBR value for the embankment material can be used if the modified CBR standard for the lower roadway is 5 or more in the road specification and road design manual. Therefore, the modified CBR value of the shared reclaimed landfill using phosphate gypsum is at least 5 And it can be used as embankment material.
Claims (4)
2) laying the phosphate gypsum bed frit on a common water surface; And
3) disposing a soil layer filler on top of the phosphate gypsum layer landfill,
The above steps 2) and 3) are alternately repeated,
The in-furnace desulfurization-type fluidized bed boiler incineration residue is obtained from a fluidized bed combustion boiler desulfurization process in which any one selected from petro coke or bituminous coal or a mixture of two or more thereof is used as fuel and limestone is mixed for desulfurization in the furnace,
Characterized in that the phosphoric acid gypsum and in-furnace desulfurization-type fluidized-bed boiler incineration residue stimulates the blast furnace slag fine powder to generate a large amount of hydrate, thereby preventing the increase in the strength of the phosphate gypsum, neutralization treatment and leaching of harmful substances .
Further comprising a dehydrating material for rapidly reducing the moisture content of the soil layer deposit and improving water permeability.
Wherein the dehydrating material is any one or a mixture of two or more selected from the group consisting of fly ash, bottom ash, biomass incineration residue, paper sludge incineration residue, waste concrete fine powder, steel making slag dust and KR dust.
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| KR1020140020507A KR101619778B1 (en) | 2014-02-21 | 2014-02-21 | Reclamation method |
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| KR1020140020507A KR101619778B1 (en) | 2014-02-21 | 2014-02-21 | Reclamation method |
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| KR101674025B1 (en) * | 2016-01-06 | 2016-11-22 | 주식회사 콘크리닉 | Fabric form for protecting slope area using eco-friendly inorganic binder composition and construction method of protecting slope area using the same |
| KR102075396B1 (en) * | 2018-05-28 | 2020-02-11 | 주식회사 지안산업 | Solidified agent menufacturing methode for poor ground |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003003476A (en) * | 2001-06-21 | 2003-01-08 | Penta Ocean Constr Co Ltd | Earth filing method using cohesive soil having high moisture ratio |
| KR100981358B1 (en) * | 2009-09-25 | 2010-09-10 | 이한재 | The soil composition and its manufacturing method that using the dredged soils and industrial by-product for reclaiming the public surface of water |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003003476A (en) * | 2001-06-21 | 2003-01-08 | Penta Ocean Constr Co Ltd | Earth filing method using cohesive soil having high moisture ratio |
| KR100981358B1 (en) * | 2009-09-25 | 2010-09-10 | 이한재 | The soil composition and its manufacturing method that using the dredged soils and industrial by-product for reclaiming the public surface of water |
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