KR20030075045A - The Manufacturing Method and The Soil Stabilizer Improving High Water Content-Soft Ground Reusong Industrial Discharge and Ocean Waste - Google Patents

Abstract

PURPOSE: A solidifying agent composition using marine wastes and industrial wastes is provided to reforming the physical and chemical properties of ground earth, to reduce environmental pollutions, and to save resources. CONSTITUTION: The solidifying agent composition for reforming a ground of water-borne soft earth using marine wastes and industrial wastes comprises: 0 to 25 parts by weight of a lime from a shellfish shell, 0 to 25 parts by weight of a slag, 0 to 25 parts by weight of a gypsum, and 50 to 80 parts by weight of a fly ash, based on 100 parts by weight of the total solidifying agent. The solidifying agent composition is characterized by further comprising 5 to 25 parts by weight of bentonite and water glass. The solidifying agent composition is produced by drying and firing a shellfish shell and grinding and fractioning it to obtain a lime material, and then mixing a predetermined amount of fly ash, gypsum and slag as industrial by-products with the lime material.

Description

Manufacturing Method of Soil Stabilizer Improving High Water Content-Soft Ground Reusong Industrial Discharge and Ocean Waste using Marine Fishery Waste and Industrial Waste

The present invention relates to a method for manufacturing ground-improved solidified solids of hydrous soft soil using marine fishery wastes and industrial wastes, and more specifically, to replace cement and limestone by recycling marine fishery wastes and industrial wastes. The present invention relates to a composition of a ground-improved solidified soil of hydrous soft soil using marine fishery waste and industrial waste which can be made to improve soil or solidify soft soil.

In general, solid fires are solidification of the soft soil, which is injected into the soft soil and reacts with the target soil in the ground to form a solid physical and chemically stable hardening body, or to solidify the harmful wastes in water. Heavy metals, etc., are made to harm the groundwater or soil so that they do not harm or change into difficult forms.

Conventionally, high water waste is known to be subjected to a heat treatment method or a dehydration forcibly using a dehydrator. In addition, sludge having a high moisture content is treated with a flocculant, and then deagglomerated sludge is dehydrated with a dehydrator or flocculated and settled to remove the clear water at the top and dried in sunlight. There is a method of solidifying the sludge directly by using a hardened material of the sludge, or treating the sludge with hydrous soft soil.

However, it takes a lot of time to use the flocculant, and the process such as sediment must go through the steps of dehydration and solidification again. Cement and limestone are manufactured by firing at a high temperature, and are expensive, finite resources are limited, and huge amounts of open-air mining High quality limestone has already been depleted with severe natural damage, and therefore it is urgent to develop a substitute for limestone for saving of calcite resources and environmental protection.

On the other hand, shells such as oysters, eardrums, and clams, which are by-products of shellfish aquaculture, which are marine fishery wastes, are illegally dumped and harm the coastal environment, but they are used only as fossils and calcareous fertilizers.

Accordingly, the present invention has been made to solve all the problems described above, to produce lime using raw materials of shells such as oysters, eardrums, clams, etc., by-products of shellfish farming, which is a marine fishery waste, and using the lime By reducing the cost of raw materials, preventing environmental pollution, and providing a composition of ground-improved solidified solids of water-containing soft soil using industrial wastes, which are industrial marine wastes that can be expected to replace natural lime. The purpose is.

In order to achieve the above object, the present invention collects shells such as oysters, tympanic membranes, and clams, which are by-products of shellfish farming, which are marine fishery wastes, and performs grinding and classification through drying and firing processes in a rotary kiln. Lime is prepared, and this is a raw material of lime ash, which is mixed with industrial ash by fly ash, gypsum, blast furnace slag, etc. in a certain ratio, and then mixed with water to react with soil. Therefore, according to the present invention, it is possible to manufacture an environmentally friendly solidified material which can improve the ground and solidify the wastewater sludge by using the pozzolanic reaction and the ettringite reaction.

1 is a flow chart illustrating a method of manufacturing ground-improved solidified soil of hydrous soft soil using marine fishery waste and industrial waste according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a flow chart illustrating a method of manufacturing ground-improved solidified soil of hydrous soft soil using marine fishery waste and industrial waste according to the present invention.

As shown in FIG. 1, the present invention collects shells, such as oysters, eardrums, and clams, which are by-products of shellfish farming, from marine fishery wastes, and carries out grinding and classification through drying and firing processes in a rotary kiln. It is a manufacturing step of producing lime, and a mixing step of mixing the raw ash with industrial ash by fly ash, gypsum, blast furnace slag and the like at a certain ratio, and solidifying step of mixing the mixture with water in the target soil.

The above method is characterized in that it is used to improve the ground to improve the soft ground.

Shells of oysters, eardrums and clams, which are by-products of shellfish aquaculture, which are marine fishery waste, are calcium carbonate (CaCO ₃ ) of calcite structure, which is the ore of limestone. Done.

Here, using the prepared lime as a raw material of lime and industrial by-products fly ash and gypsum, blast furnace slag and mixed in a certain ratio to produce a ground-improved solidified material.

Water-based soft ground improvement is to remove or reduce the harmful behavior of the ground that may occur after construction or completion when constructing the structure, and it is a solidification step in which solidified fire is mixed with water on the target soil. .

The above method is used to improve the water soft ground.

Blast furnace slag is a material suspended in molten state at high temperatures by mixing with rocky Al ₂ O ₃ SiO ₂ whose main component is mixed with iron ore impurities during blast furnace work of steel mill, and fly ash is boiler of coal-fired power plant The fine particles of ash contained in the gas stocks, which consist mainly of silicon dioxide (SiO ₂ ) and aluminum oxide (Al ₂ O ₃ ), and gypsum (CaSO ₄ ) is a by-product of phosphate from fertilizer plants. .

Lithium (CaO) made from shells, a by-product of shellfish farming, a marine aquatic waste, is solidified by an initial hydraulic reaction with a mixture of fly ash (SiO ₂ ) and water mixed in the target soil. Will produce a substance.

The chemical formula is CaO + Al ₂ O ₃ + 3CaSO ₄ + 32H ₂ O → 3CaOAl ₂ O ₃ 3CaSO ₄ 32H ₂ O

_{4CaO · Al 2 O 3 · Fe} 2 O 3 + 6CaSO 4 + 2Ca (OH) 2 + 62H 2 O

→ 3CaOAl ₂ O ₃ 3CaSO ₄ 32H ₂ O + 3CaOFe ₂ O ₃ 3CaSO ₄ 32H ₂ O

That is, since hydration produces needle-like crystals called ettringite, and voids are reduced, cracks due to dry shrinkage of the soft soft ground are reduced, and long-term strength is improved and waterproofing is achieved.

Lime prepared from shells, a by-product of shellfish aquaculture, is a marine fishery waste, and a solid material is produced through the reaction of fly ash with gypsum and iron oxide (Fe ₂ O ₃ ) and pozzolan.

The chemical formula is

Ca (OH) ₂ → Ca ^{2 ++} +2 (OH) ^-

^{Ca 2+ +2 (OH) - +} SiO 2 (Soil silica) → CaO · SiO 2 · H 2 O

^{Ca 2+ +2 (OH) - +} Al 2 O 3 (Soil alumina) → CaO · Al 2 O 3 · H 2 O

That is, pozzolanic is not cementitious in itself but reacts with calcium hydroxide (Ca (OH) ₂ ) to form CSH.

Blast furnace slag causes latent hydraulic reaction when present together with cement and water, and fly ash has no hydration reaction on its own, but soluble silica (SiO ₂ ) reacts slowly with calcium hydroxide produced during cement hydration at room temperature, making it insoluble and stable. It produces calcium silicate hydrate and improves workability and pumpability. The amount of cement used can be reduced by the amount added to the cement.

Ocean Water waste of the lime is calcium, calcium oxide produced as a by-product the shell of shellfish farming are silica (SiO ₂₎ and alumina (Al ₂ O ₃₎ component ratio is 6: 1 or more by a hydration reaction with the siliceous raw materials Calcium silicate It can be used as a raw material than limestone because it is used for synthesis of system building materials.

The process of the invention can also be used to solidify sewage sludge.

Solidification is the addition of a sufficient amount of solids, including solids, to toxic substances, resulting in the formation of solids. Solidification treatments for the prevention of environmental pollution include heavy metals contained in hazardous wastes. Water) to harm the groundwater or soil, or to change it into a form that is difficult to dissolve.Inorganic solidifying materials are usually cement-reactive, causing chemical reactions between pollutants and solidifying materials Suitable for solidifying heavy metals).

In the present invention, the manufacturing method can be used to manufacture the construction materials by solidification and solidification. If the content of CaO is low and the content of silicic acid (SiO ₂ ) is high, the softening of the softening can be sufficiently performed. It will be available as the main ingredient for general softening.

(1) By-products of shellfish farming, a marine marine waste

Shell, which is a by-product of shellfish aquaculture, a marine aquatic waste, is a high-purity calcium carbonate of calcite or calcite crystals. It is a natural inorganic material with advantages not found in limestone.

Refined and processed shells, which are by-products of shellfish farming, which are marine fisheries waste, to produce quicklime and slaked lime, and technology development using slag, which is an industrial by-product, expands the recycling range of oyster shells and slag that are mostly disposed of, and uses them as high value-added products In addition to the development, the development of this technology is urgently needed in consideration of the recycling aspect and environmental preservation aspects of environment-friendly products due to the quality development of environment-friendly products that meet the characteristics of each application.

division Characteristics of Lime Using Marine Culture Shell Adult and Mountain Gyeongnam, Jeolla South Coast chief ingredient Calcium Carbonate (CaCO ₃ ) Categories and Particles Powder level: 3000 cm 2 / g or more, loss on ignition: 50% or less, calcium oxide: 45% or more

(2) slag

division Slag properties Adult and Mountain Steelmaking and Steelmaking Process chief ingredient SiO ₂ , CaO Categories and Particles Powder level: 4000cm2 / g or more, Salinity: 1% or less Loss on ignition: 5% or less

(3) fly ash

division Characteristics of Fly Ash Adult and Mountain Thermal power plant, by-product of steel mill chief ingredient SiO ₂ , Al ₂ O ₃ Categories and Particles Powder level: 3000 cm 2 / g or more, Loss on ignition: 5% or less, SiO ₂ : 50% or more

(4) gypsum

division Characteristics of plaster Adult and Mountain By-products of Phosphate and Fertilizer Manufacturing Process chief ingredient CaSO ₄ Categories and Particles Powder level: 3000 cm 2 / g or more, loss on ignition: 5% or less, SO ₃ : 50% or more

Hereinafter, the manufacturing method of the present invention will be described.

Manufacturing and production of lime by carrying out collecting and collecting shells of oysters, eardrums, clams, etc., by-products of shellfish farming, which are marine fisheries wastes, and drying and firing in rotary kilns to produce lime. Mixing step of mixing industrial ash by fly ash and gypsum, blast furnace slag at a certain ratio, and mixing it with water on the target soil to activate the complex by Ettringite reaction and Pozzolan reaction. It is a solidification stage.

The by-product shell of shellfish aquaculture, a marine waste collected from the coast, is removed and pulverized with a coarse grinder, followed by firing at 450∼1300 ℃. At this time, the temperature increase rate is slowly dried and calcined at 0.5∼1.5 ℃ / min. Manufacture lime.

When the blending ratio (proper ratio) of the present invention is based on 100 parts by weight of the total composite of the solidified material, the shell lime weight is 0 to 25, the slag weight is 0 to 25, the plaster weight is 0 to 20, and the fly ash weight is From 50 to 80. Moisture adjustment is determined by the water content of the soil.

The amount of additive is selected and applied on site according to the moisture content, uniaxial compressive strength and bearing capacity ratio of the applied soil.

(Example 1)

Test results of solidification treatment of sewage sludge

1. Conditions for discussion before treatment

division One 2 3 4 standard PH 5.90 6.40 6.20 6.60 Moisture content (%) 74.30 72.10 70.40 76.20 Weighting 1.532 1.532 1.494 1.387 Ignition loss 51.20 53.40 52.10 58.34

2. 3 days test result of solidification treatment of sewage sludge

division One 2 3 4 standard PH 12.00 12.20 12.00 12.10 Uniaxial Compressive Strength kg / ㎠ (3 days) 3.27 2.90 3.40 4.10

3. 7 days test result of solidification treatment of sewage sludge

division One 2 3 4 standard PH 12.00 12.01 11.70 11.10 CBR 5.0 10.20 9.36 7.27 6.90 Uniaxial compressive strength kg / ㎠ (7 days) 5.60 6.34 6.40 6.20

(Example 2)

Heavy Metal Dissolution Test Results

1. Sludge Before Solidified Fire Treatment

division Sludge 1 Sludge 2 Sludge 3 Sludge 4 Below standard (ppm) AS 0.40 0.32 0.20 0.30 1.50 Cr Not detected Not detected Not detected Not detected 1.50 Pb 86.34 50.32 48.07 36.29 3.00 CD 0.60 0.50 Not detected 0.21 0.03 Cu 6.22 5.34 6.27 10.21 3.00 Hg Not detected Not detected Not detected Not detected 0.005 CN Not detected Not detected Not detected Not detected 1.00

2. Dissolution test result of solid heavy metal after solidified fire

division Sludge 1 Sludge 2 Sludge 3 Sludge 4 Below standard (ppm) AS Not detected Not detected Not detected 0.13 1.50 Cr Not detected Not detected Not detected Not detected 1.50 Pb 0.015 0.017 0.01 0.03 3.00 CD Not detected Not detected Not detected Not detected 0.03 Cu Not detected 0.15 0.18 0.03 3.00 Hg Not detected Not detected Not detected Not detected 0.005 CN Not detected Not detected Not detected Not detected 1.00

As described above, according to the solidified fire manufacturing method using the oyster shell according to the present invention, it is possible to reduce the environmental pollution by recycling the oyster shell, can be used as a building material such as soil improvement work to save some resources by replacing the natural cement In addition, it is possible to solidify the sludge of sewage water, thereby reducing the environmental pollution.

Claims (3)

In the composition of solidified fire using marine fishery waste and industrial waste, Based on the total weight of the solid composite based on 100 parts by weight, the shell lime weight part is 0-25, the slag weight part is 0-25, the gypsum weight part is 0-20, the fly ash weight part is 50-80. Bentonite and water glass in order to improve the coefficient of 5 to 25 to the total weight of the composition, characterized in that the composition of the ground improvement type solidified soil of the water soft soil using marine fishery waste and industrial waste. A manufacturing step for collecting lime by carrying out collecting and collecting shells of oysters, eardrums, and clams, which are by-products of shellfish farming, which are marine fishery wastes, and performing grinding and classification in a rotary kiln for drying and firing; Marine fishery waste and industry comprising a mixing step of mixing this as raw material of lime and mixing industrial ash by fly ash with gypsum, blast furnace slag at a constant ratio, and solidifying step by mixing it with water on the target soil. A method for producing ground-improved solidified fire of hydrous soft soil using waste. After removing foreign substances in shells, which are by-products of marine aquatic wastes, the calcining process is carried out at 950-1500 ℃, and the heating rate is slowly calcined at about 0.5-1.5 ℃ / min to produce lime (CaO). The solidified material manufactured by mixing slag, blast furnace slag, fly ash, gypsum, etc. of the steelmaking process is a composite of the etringite and pozzolan reactions that are mixed with the soil and water to cause stimulant reactions. Method of manufacturing ground-improved solidified firewood of hydrous soft soil using marine fishery wastes and industrial wastes, characterized in that made by activation.