KR20160083533A - Artificial soil comprising dry bottom/middle ash and the manufacturing method of the same - Google Patents

Abstract

The present invention relates to an artificial soil using dry coal as well as a method for producing the artificial soil, and more particularly, to a method for producing artificial soil using a dry coal ash, a rock surface, and a feldspar (oyster shell) Cocofit, peat moss, and fecal soil in a second mixer; And a third mixing step of mixing and mixing the mixture in the first mixer with a second mixer, wherein a water-holding power enhancer is added in the third mixing step. do.
According to the present invention, dry coarse material having improved physical and chemical properties is used in a large amount compared with wet bottom ash recycled as a raw material for a conventional artificial soil, thereby lowering the cost of artificial soil to be used for landscaping, It is widely expected to supply domestic consumers as planting soil and to reduce environmental pollution by reducing waste by using waste of power plant as useful resource.

Description

Technical Field [0001] The present invention relates to an artificial soil using dry coal ash and a method for producing the same,

The present invention relates to an artificial soil using a dry coal ash and a method for producing the artificial soil, and more particularly, to a method for preparing an artificial soil using a dry coal ash as an inorganic mineral material, A secondary mixing step of mixing coco peat, peat moss and fecal soil as an organic supplement in a second mixer; And a third mixing step of mixing and mixing the mixture in the first mixer with a second mixer, wherein the water-improving agent is added as an additional auxiliary agent in the third mixing step. ≪ / RTI >

The amount of dry bottom ash that was reprocessed after the prohibition of marine reclamation of wet bottom ash due to the increase in power consumption in Korea was 200,000 tons in 2013 and the explosion increase from 600,000 tons in 2017 However, since most of the coal ash produced in the middle layer of the combustion furnace is about 1 mm in size, it is about 15% of the total coal ash in the combustion furnace. And it is now being abolished at the whole stockpile, and environmental pollution problem is caused. Therefore, researches are being carried out to utilize these recyclable materials as lightweight aggregate and artificial soil.

Generally, coal ash generated from thermal power plants is wet bottom ash, which is easy to supply and receive, but it is cooled and discharged by using seawater. Therefore, salt and water content are high and unburned coal is close to 25% There are many. On the other hand, the dry bottom ash that is fed by air cooling is very low in salt and moisture, and the unburnt carbon content is reduced to less than 1%, which is high value as recycled resource. In addition, since the dry bottom ash is subjected to a high temperature sterilization process, it is suitable for use as an artificial soil material for planting because there is no contamination by parasitic microorganisms inside. Middle coal ash is also suitable for use as an artificial soil material.

The major components of dry coal ash are oxides of silicon, aluminum and iron, which account for about 85% by weight of dry coal ash, and about 10% by weight of oxides of garlic, calcium and magnesium as fertilizer, It can be a good source of minerals.

Soil materials used in the production of artificial soil are largely composed of inorganic mineral materials, organic supplement materials, and supplementary auxiliaries. Inorganic mineral materials include pearlite, vermiculite, and zeolite, and organic supplement materials include coco peat, peat moss, , Water-repellency improving agents, vegetable fibers, rock wool, and fossil stones are used as the additional adjuvants.

The inorganic mineral materials are mainly composed of silicon, aluminum and iron, and there are trace amounts of potassium, calcium and magnesium as fertilizer components, and these components are components sufficiently contained in dry coal ash. When dry coal ash is not recycled, most of the above inorganic materials used in the manufacture of artificial soil are imported from foreign countries, so that the manufacturing cost of artificial soil is increased. Calcium and magnesium contained in imported inorganic materials are less in content than dry coal ash .

Considering these facts, it is possible to manufacture artificial soil with low cost by substituting inorganic mineral material with dry coal, and it can be used as artificial soil for landscape or rooftop greening, or as soil for seedling or planting, Recycling of coal ash can reduce waste generation.

Nevertheless, there has been no case in which such dry coal ash is actively used in the production of artificial soil.

Disclosure of the Invention The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a method for producing artificial soil, which comprises using a dry coal ash material having improved physical and chemical properties as compared with a wet bottom ash recycled as a raw material for a conventional artificial soil, Is to be widely supplied to domestic consumers as landscaping, horticultural or nursery, and planting soil, and it is aimed to prevent environmental pollution by reducing the amount of land by using waste of power plant as useful resources.

In addition, the present invention can sufficiently prevent the occurrence of scattered dust, which is different from the occurrence of scattered dust in the transportation and installation process of pearlite used for rooftop greening and the like, by sufficiently securing water retention in the process of producing artificial soil, The other purpose is to prevent the occurrence of air delays caused by the health and safety of participants, and the occurrence of complaints caused by surrounding dusts.

In addition, the present invention is applicable to freeze-drying and freeze-drying, which are caused during long-time soil watering in the course of artificial soil installation in the winter season, It is another object of the present invention to provide a method of preventing the drying damage of a plant by planting the defects in an appropriate humidifying condition at the same time as planting and further watering the plants

The present invention also provides a method and apparatus for controlling the supply amount and supply timing of water so that the water can be evenly supplied between the inorganic mineral particles without causing a shortage of the water holding capacity of the artificial soil essential for growing the crop during planting, Another purpose is to adjust it appropriately.

In addition, according to the present invention, the water content of the artificial soil is continuously absorbed by adjusting the amount of the water-retaining agent to be supplied according to the selection plan of planting plant species, so that moisture retained in the particles can be supplied to the crop, Another object of the present invention is to prevent the manufacturing cost from being increased.

In order to achieve the above-mentioned object, the present invention provides a method of mixing a dry coal material, a rock surface and an oyster shell (oyster shell) in a first mixer; Cocofit, peat moss, and fecal soil in a second mixer; And a third mixing step of mixing and mixing the mixture in the first mixer with a second mixer, wherein a water holding capacity is always supplied in the third mixing step. to provide.

The present invention relates to a method for improving the water retaining ability of a dry coal ash, which comprises 30 to 80% of the dry coal ash, 6 to 10% of a rock surface, 1 to 3% of fossil oak, 1 to 3% of coconut, 10 to 30% of peatmoss, 7 to 13% 3.0%.

The dry coal ash preferably has an average particle size of 0.15 to 5.0 mm.

In order to control the pH of the dry coal ash, it is preferable to further add a pH lowering agent.

The water retention enhancer is preferably coated and mixed with porous mineral or vegetable fiber.

Preferably, the porous mineral is bentonite or zeolite, and the vegetable fiber is a coconut fiber.

It is preferable that nitrogen (N), phosphoric acid (P2O5), and gallic acid (K2O) are further added to the water retention improving agent.

In the first mixing step, it is preferable that water is mixed and mixed in a volume of 100 to 300% based on the sum of the dry coal ash, the rocky surface, and the fossil stone (oyster shell).

In the second mixing step, it is preferable to add water by adding water so as to have a volume of 150 to 350% based on the cocofit, peat moss, and the total volume of the compost soil.

Also, the present invention provides an artificial soil using dry coal ash characterized by comprising dry coal ash, rock surface, fossil stone (oyster shell), coco peat, peat moss, fecal soil, and water retention improving agent.

The present invention relates to a method for improving the water retaining ability of a dry coal ash, which comprises 30 to 80% of the dry coal ash, 6 to 10% of a rock surface, 1 to 3% of fossil oak, 1 to 3% of coconut, 10 to 30% of peatmoss, 7 to 13% 3.0% is preferably mixed.

The rock surface is obtained by removing foreign matter from the collected lung cancer surface, sterilizing it at 120 to 180 ° C for at least 30 minutes, pulverizing it to an average particle size of 2 to 10 mm to remove microbial contamination, or blending with low melting point polyester A granite rock or a granite rock surface which has undergone one of the processes of granulation and granulation is used, and it is preferable to use granular fossils having an average size of 2 to 5 mm in size as fossil fired.

According to the present invention, the artificial soil is produced by injecting water into the dry coal ash having improved physical and chemical properties compared with the wet bottom ash recycled as the raw material of the conventional artificial soil, It is possible to maintain the moisture required for the growth of crops and to use it in large quantities in artificial soil to lower the cost of artificial soil so as to supply widely to domestic consumers as landscaping, horticultural or nursery, It is anticipated that the effect of preventing the environmental pollution by decreasing the amount of deposition can be expected.

In addition, in the present invention, it is possible to replace expensive pearlite, vermiculite, zeolite, and the like which have been conventionally used by using a large amount of dry coal ash, so that the blending ratio can be reduced, It is anticipated that an action effect of making it possible to use a large amount usefully.

In addition, by recycling the rocky surface which is generated in a large amount in the farmhouse, it is possible to improve the water retention and air permeability of the artificial soil, to contain a large amount of soluble silicic acid and lime components, and to have a sufficient goto composition, do.

In addition, the fossil is a natural carbonated lime that neutralizes the soil, helps the root development of the plant, and strengthens the cell membrane by binding with pectin to enhance the disease resistance and the high temperature baking treatment, thereby reducing the risk of microbial contamination It is expected that the effect of filtration of heavy metals mixed when the rainwater falls into the surface can purify the rainwater.

The manufactured artificial soil can be used as a rooftop greening and wall greening for landscaping, and as a material for horticultural use and water supply for gardening and planting, and also for artificial wetlands and rainwater It is expected that the effect can be utilized as a filling soil for planting in a wetland at the time of gardening.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process diagram of a preferred embodiment of the artificial soil and method of the present invention. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The dry coal ash in the present invention may be classified as having an average particle size of from 0.15 to 5.0 mm from the bottom ash of a power plant combustion furnace or by using ash produced from the bottom ash and fly ash middle layer ) Of ash having a particle size of 0.15 mm or more. That is, both bottom ash and middle ash are targets.

Conventional bottom ash of a thermal power plant used for manufacturing artificial soil is wet bottom ash. Applicant has already registered Patent No. 0959807 A method of manufacturing a lightweight artificial soil using coal ash and sludge, and a rooftop greening system using the same, It has been commercialized for recording.

Wet bottom ash has a high salt content due to the cooling and transporting process of seawater. In order to recycle it, it has to be washed with fresh water and treated with wastewater. The pH of the bottom ash is as high as 9 ~ 11, so that a pH lowering agent such as phosphoric acid or nitric acid is essentially added I had to. Since the dry coal ash used in the present invention is generated through an air-cooling process without the use of seawater, the salt content (Na 0.43%) is very low. To use it as a water source, a small amount of a pH lowering agent (phosphoric acid or nitric acid) Can be used. The particle size of the bottom ash of the dry coal ash is 0.15 to 5.0 mm. If excess amount of less than 0.15mm is excessive, drainage and ventilation performance deteriorate, resulting in inundation damage due to poor drainage performance during heavy rainfall. When the particle size exceeds 5.0mm, deterioration of repair performance And the poor self-sufficiency of the plant, there is a risk of vegetative conduction due to wind pressure.

However, in the case of middle ash, it is not necessary to limit the upper limit to 5.0 mm separately.

The middle ash is mostly composed of 0,15 - 5 mm in composition and particle size, so no separate crushing and sorting process is required.

In the present invention, raw materials used for producing artificial soil using dry bottom ash include inorganic pigments such as dry coal ash, rock surface and fossil as a part of the raw materials, organic fertilizers such as coco peat, peat moss, The artificial soil is prepared by adding a small amount of a water-retaining agent for continuous watering to the crop.

Here, known coco peat and peat moss are used, and fecal soil is an earthworm compost. It is made by mixing earthworm, coffee, and Chinese medicine pellets, which are fecal matter during the growth of earthworms and fecal matter consumed and discharged in the environment of Chinese medicine pellets. The organic fertilizer composition of the fecal soil is 74% higher than the composting standard of 50% and the nitrogen is 1.8%. The organic fertilizer is high and the moisture content is more than 55% The pore is more air permeable than general soil, and its water retention and bending strength are strengthened. The useful microorganisms in the earthworm fraction act to inhibit the pathogenic fungus spores and pathogens of the soil. The weakness of the existing organic fertilizer is applied to the problem of the physiological disorder of the plant due to the ammonia gas and the problem of the odor problem. It is a feature of the present invention that the fecal soil with such specifications is used as the material of the artificial soil.

The inorganic mineral materials are mixed with 30 ~ 80% of dry coal ash, 6 ~ 10% of rock surface and 1 ~ 3% of oyster shell as the raw materials for mixing the artificial soil materials. 10 to 30% of peat moss, 7 to 13% of peat moss, 7 to 13% of loose earth, and then mixed with 0.1 to 3.0% by volume of a water retention improving agent.

Since dry coal ash is a recycled material in the use ratio of inorganic mineral materials, it is necessary to use as much as possible in manufacturing cost, but the components (Ca, Mg, organic etc.) not contained in coal ash are also needed for planting, The input ratio of each material was set as above in consideration of nutrient supply. Therefore, the content range of the above materials has its critical significance.

The rock surface is obtained by removing foreign matter from the collected lung cancer surface, sterilizing it at 120 to 180 ° C for at least 30 minutes, pulverizing it to an average particle size of 2 to 10 mm to remove microbial contamination, or blending with low melting point polyester A rock surface or a granular rock surface which has undergone one of the processes, granulation processes.

The rock surface is an amorphous artificial fiber with a fiber diameter of about 5 ㎛ which is recycled from agricultural wastes generated after farming and it is recognized as a substance which is different from asbestos and is not dangerous for respiratory diseases in animal experiments. The main component is 50 ~ 90% of silicic acid and lime, 2 ~ 10% of goto and crushed to less than 10mm, Water retention and air permeability are improved and the effect of calcareous and silicate fertilizer can be obtained. In addition, waste disposal can be reduced by recycling farm waste as soil improvement and fertilizer resources.

Here, in the absence of the firing process on the rock surface, secondary damages of crops and plants due to harmful microorganisms that may occur during use and disposal may be caused. This is also the case for a fossil.

In addition, when the rock surface is more finer than the lower and upper limit, the cost of the crushing operation is increased, and scattering problems occur during transport and mixing, poor workability in mixing raw materials, and poor water drainability when saturated with water. When the rock surface is larger than the upper limit, the retained water is easily permeated and the effective cross-sectional area of the particle surface is reduced, which is disadvantageous for planting roots. Therefore, the grain size of the upper rock surface has its critical significance in the upper range.

The fossil is made by crushing the oyster shell by high temperature firing. The small amount of 2 ~ 5mm granular product is added in consideration of the prevention of dust and easy to inject. The limestone contained in the fossil stone neutralizes the soil, helps the root development of the plant, To increase the disease resistance and reduce the risk of microbial contamination. The critical significance of the particle size of the sample is the same as the critical meaning of the particle size of the rock surface.

The water-repellency-improving agent means that a water-absorbing agent such as a superabsorbent polymer is mixed with a support (inorganic mineral, organic filler, etc.). Here, a fertilizer component can be further added. The above water-absorbent polymer is a water retention enhancer. When the polymer is polymerized, characteristics of the alkaline, which is a neutralizing agent of acrylic acid, are changed by using caustic soda, potassium hydroxide and ammonia selectively. When fertilizer is added, , And porous inorganic minerals such as vegetable fibers, bentonite, and zeolite, such as coconut fibers, may also be added as organic fillers for functional addition. The vegetable fiber and the porous mineral are not limited to the above.

At the time of manufacturing, it is possible to control the cross-linking degree between the bonding elements in the acrylic polymer and to add the fertilizer component and adjust the addition amount of the fertilizer to maintain the solidity of the particle during water absorption swelling.

More specifically, the water retention enhancer of the present invention may be added with bentonite and / or zeolite as an inorganic mineral soil improving agent to a super absorbent polymer having excellent water absorption ability, and a coconut fiber as an organic supplement material, The type and amount of the additive are controlled. Here, nitrogen, phosphoric acid, and garlic fertilizer are added so that essential nutrients can be supplied during planting. In the manufacturing process, the inorganic mineral and the fertilizer materials are pulverized and uniformly mixed, and then dispersed in a polymerization liquid for preparation of a superabsorbent polymer to prepare an additive particle coated with a superabsorbent polymer. In the polymerization of superabsorbent polymer, And the amount of soil fertilizer added and the amount of fertilizer to be added. In consideration of the robustness of the particles of the water-repellent agent during use, the water absorption capacity is adjusted to about 100 times the volume, Which is advantageous for particle stability and air permeability. The outer layer of the water retention enhancer is poorly soluble, but the inner soil modifier and fertilizer materials are dispersed in the moisture when the water absorbing and expanding is swollen. When the moisture inside the water retention enhancer is released to the surrounding planting crops, Exchange or fertilizer ingredients slowly.

The function of the mineral soil improvement agent is as follows. Bentonite expands to 15 times its magnetic volume, absorbing water, retaining it, becoming gelled, and becoming compatible when mixed with other materials. In addition, since the original chemical properties of the adhesive material are not affected, it is possible to suppress the deterioration of the grain robustness of the water retention improving agent. The water retention enhancer is also used as a pet excrement disinfectant using the absorption performance and the integrity. Zeolite absorbs water up to 20 times its magnetic volume, easily drains excess water, contains a large amount of exchangeable cations in the crystal structure, strongly adsorbs unsaturated hydrocarbons and polar substances, There are many pores, and particles larger than pores can be filtered. In addition, it is possible to remove harmful substances by exchanging cations in passing foreign substances or to concentrate and recover useful components, and to remove moisture, carbon dioxide gas and harmful sulfur dioxide gas in the natural atmosphere (BioRetention). The inorganic soil improving agent and the organic fiber are not limited to the above.

The fertilizer component can be applied to the waterworks by adjusting the amount of nitrogen, phosphoric acid, and gardens to be similar to that of general-purpose horticultural fertilizer.

The artificial soil utilizing the dry coal ash of the present invention and its manufacturing method will be described in detail as follows.

FIG. 1 shows a process diagram of a preferred embodiment of the artificial soil and the manufacturing method of the present invention.

In addition to the dry coal ash, the raw materials for the soil improvement agent are rock wool, fossil as inorganic fertilizer, cocofit, pitmus, dusted soil as an organic replenishing agent, and water retention improver for improving water holding capacity.

The water retention enhancer such as a superabsorbent polymer has excellent water absorption ability and is used as an infant diaper, a sanitary napkin, a water retention agent for gardening, and the like. At the time of manufacturing, acrylic acid can be polymerized with monomers neutralized with caustic soda, caustic potassium, ammonia, etc. so that the polymer having water absorption capacity up to 500 times its own weight can be produced. However, it is possible to control the cross- The absorbency can be controlled by imparting the desired characteristics.

Since rocks and feldspar used with dry coal ash are inorganic mineral materials, all moisture is removed during combustion, high temperature sterilization and firing process, so there is a problem in operation due to abrasion between particles and dust generation during transportation and mixing, Since there is no essential moisture for growth, water is added to the inorganic mineral material to maintain the moisture content of the inorganic mineral material by adding water twice as much as the total volume of the three inorganic minerals.

The organic supplements cocofit, peat moss and three kinds of fugitive soil have the minimum water content, but the water holding power is much better than inorganic mineral materials. Therefore, the water addition amount is set to be about 2.5 times the total volume of the organic filler material and mixed .

The water retention enhancer is added to the final mixing process by first mixing the first and second mixed materials in the final mixing step. When it is first put into contact with the water, the water absorbs the water in advance and expands, It is fragile and fragile in the mixing process. It is preferable to apply 0.1 ~ 3.0% of the total volume of the artificial soil. If the amount is less than the lower limit, the water amount to be fed to the crop after the exhausted water of the compounded soil is insufficient. If the water content exceeds the upper limit, The soil is not good due to the change of the total soil volume due to swelling and the like, and soil loss at the boundary of the greenery may occur. As a result, roots are exposed in a state where the plants such as the gypsum and the pest are swollen . In addition, the absorption expansion volume of the water retention enhancer increases by three times or more than the total volume of the dry feedstock, which makes it difficult to mix the mixed artificial soil to the workplace. In addition, there is a problem that the artificial soil volume is excessively increased and the manufacturing cost becomes too high. Therefore, the amount of the water retention enhancer is critical in the above range.

In order to improve the particle strength of the water-repellent agent, coconut lignin staple fibers and bentonite or zeolite containing natural moisturizing function are added, and the water-retaining agent is added by adding a fertilizer component. That is, cocofit and bentonite or zeolite serve as a support. Here, other vegetable fibers other than coco peat may be used, and other types of porous minerals other than bentonite or zeolite may be used, and therefore, the present invention is not limited to coco peat and bentonite.

The water retention enhancer absorbs moisture from the first and second raw materials without adding any additional water, and causes volume expansion of about 100 times. Also, it maintains the water constantly and does not require additional irrigation water after planting, Can be minimized. In addition, while supplying water continuously to the crops during the planting period, it gradually dissolves the added nitrogen, phosphoric acid and fertilizer components so that the crops can grow smoothly.

In the case of artificial soil preparation, water is added 1 to 3 times as much as the total volume of the three mineral and inorganic materials in the first mixing and 1.5 to 3.5 times as much water as the total volume of the three organic filling materials in the second mixing It has a sufficient moisture content to provide an environment suitable for rooting root growth and growth of plant species. However, the amount of water added is more in the first mixing than in the second mixing. This is because the organic filler has already a higher water content than inorganic mineral materials.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process diagram of a preferred embodiment of the artificial soil and method of the present invention. FIG.

As shown in the figure, the method for producing artificial soil according to the present invention comprises a primary mixing step of mixing dry coal as inorganic mineral material, rock surface and fossil stone (oyster shell) in a first mixer; A secondary mixing step of mixing the organic supplementary material coco peat, peat moss and fecal soil in a second mixer; And a third mixing step of mixing and mixing the mixture in the first mixer with a second mixer, wherein the third mixing step is carried out by adding a water holding capacity improving agent.

In the primary mixing step, it is preferable to add water to mix dry coal ash, rocky surface, fossil stone (oyster shell) combined volume 1: input volume 1 to 3, and in the second mixing step, coco peat, peat moss, Volume 1: It is preferable to mix water by adding water so that the volume of the input water is 1.5 to 3.5.

Inorganic mineral materials are removed by burning, high temperature sterilization, and firing process. Therefore, when the amount of the input material is less than the lower limit, abrasion and dust generation among the particles during transportation and mixing are serious, There is a problem of delay. In addition, when the amount of water is larger than the upper limit, workability is deteriorated due to soil tangling at the time of on-site installation, and the weight is increased, which is not preferable for rooftop greening, Therefore, the input of water has its critical significance in the above range. This critical significance applies equally to the relationship between the following organic supplement and the amount of water.

The three kinds of organic supplements have a little moisture but their water retention is much better than those of inorganic mineral materials. Therefore, the amount of water is generally lower than that of primary mixing, and addition of 1.5 ~ 3.5 times of volume of organic supplementary total And mixed.

On the other hand, it is preferable to add a pH lowering agent to adjust the pH of the dry coal ash. This is because different pHs are required depending on the use of the artificial soil. That is, when a little acidity is required, a pH-lowering agent is added in order to give the acidity more or less. Examples of the pH lowering agent include phosphoric acid and nitric acid.

<Examples>

A method of manufacturing an artificial soil according to an embodiment of the present invention is as follows.

First, dry coal ash: rock wool: fossil rock was charged into a primary mixer at a volume ratio of 50: 8: 2. In this case, the dry coal ash is discharged from the thermal power plant to the bottom of the combustion furnace through crushing and sorting process, and the average particle size is 0.15 to 5.0 mm, or the average among the ash fractions (intermediate coal ash) generated in the bottom ash and fly ash Ash having a particle size of 0.15 mm or more was used without any separate grinding step. However, even in the case of the intermediate coal ash, it is preferable to use a material having an average particle size of 5.0 mm or less. At this time, the pH of the dry coal ash was less than 10 and the EC was less than 0.1, and the inorganic composition was as shown in Table 1 below.

Physico-chemical characteristics of dry coal ash division Physical Characteristics Chemical composition (%) pH EC
(dS / m) SiO2 Al2O3 Fe2O3 CaO MgO K2O Na2O SO3 Ig.
Loss deflation
Coal ash 8.1 0.03 49.2 20.4 15.6 6.8 2.0 1.5 1.1 0.1 1.8

An oxide content analysis table of inorganic material for artificial soil division
Chemical composition (%) SiO2 Al2O3 Fe2O3 CaO MgO K2O Na2O Pearlite 70 ~ 75 12 to 15 0.5 to 2 0.5 to 1.5 0.2 to 0.7 3 to 5 3 to 4 Vermiculite 57.4 15.9 9.05 0.57 9.01 3.25 - Zeolite 47.4 26.8 - - - - 16.3 Rock face 35 ~ 47 - - 14 to 40 2 to 10 - - Fossil - - - 53 - - -

As shown in Table 2, the three kinds of inorganic main constituents such as pearlite, vermiculite, and zeolite, which are inorganic mineral materials, are similar to the dry coal materials, and the three kinds of inorganic materials are dry coal ash , And rock surfaces and rocks can supplement the manure of the fertilizer component.

The heavy metal stability of the dry coal ash according to the present invention was superior to that of widely used pearlite.

Results of soil pollution process test (unit mg / kg) cadmium Copper arsenic Mercury lead Hexavalent chromium zinc nickel Fluorine Soil pollution standard 4 150 25 4 200 5 300 100 400 Pearlite 0.07 13 Non-detection 0.02 6 Non-detection 17 6 210 Dry coal ash less than 5.0mm Non-detection 6 Non-detection Non-detection 7 Non-detection 8 3 Non-detection

Dry coal ash 0.15 ~ 5.0mm Particle size distribution + 2.5mm 2.5 to 1.2 mm 1.2 to 0.6 mm 0.6 to 0.3 mm 0.3 to 0.15 mm -0.15mm Sum 5 to 2.5 mm
468.9 26 0.3 0.7 1.5 2.7 500.1 93.8% 5.2% 0.1% 0.1% 0.3% 0.5% 100% 5 to 1.2 mm
188.7 294.3 8.3 1.7 4.2 2.9 500.1 37.7% 58.8% 1.7% 0.3% 0.8% 0.6% 100% 5 to 0.6 mm
134.7 173.5 149.4 24.3 15.2 3 500.1 29.6% 34.7% 29.9% 4.9% 3.0% 0.6% 100% 5 to 0.3 mm
173.6 132.6 92.1 79.1 18.4 5.4 501.2 34.6% 26.5% 18.4% 15.8% 3.7% 1.1% 100% 5 to 0.15 mm
89.5 119.7 94.8 93.7 73.6 29.8 501.1 18% 24% 19% 19% 15% 6% 100%

The dry coal ash particles were measured by pulverizing dry coal having an average particle size of 20 mm or less. The particle size distribution by intervals was not significant.

Density and volumetric density division unit Pearlite
0.6 to 2.5 mm Dry coal fly ash 2.5 to 5.0 mm 1.25 to 5.0 mm 0.6 to 5.0 mm 0.3 to 5.0 mm 0.15 to 5.0 mm Density of construction volume Kg / L 0.09 0.55 0.61 0.63 0.67 0.72 Saturation volume density Kg / L 0.71 0.75 0.86 0.92 1.06 1.22 Saturation moisture content % 678 37 41 47 57 68

* Dry bulk density of 0.15 ~ 5.0mm particle size is 0.72, which is 28% lighter than water and can be used as lightweight soil material.

* The more the dry coal ash, the larger the surface area and the higher the water content.

According to one embodiment of the present invention, cocofit, peat moss, and fecal soil, which are organic materials, were added to a second mixer at a ratio of 20: 10: 10 by volume and mixed, and the mixture was used with a particle size of about 1 to 4 mm.

Finally, for the production of artificial soil, inorganic soil in the first mixer was mixed with organic soil in the second mixer, and a water repellency enhancer was added to the soil, followed by mixing the whole to prepare an artificial soil using dry coal ash. It is very convenient to add a fertilizer component in the polymerization production of the water-absorbent polymer which is the raw material of the water-repellent improving agent, so that it is prepared by adding the nitrogen: phosphoric acid: gallic component to the water- And the amount of the ingredient can be adjusted according to the purpose of use.

Claims (12)

A primary mixing step of mixing dry coal ash, rock wool and rock (oyster shell) in a first mixer;
Cocofit, peat moss, and fecal soil in a second mixer; And
And mixing the mixture in the first mixer with a second mixer to mix the mixture in the third mixer,
And a water-holding power enhancer is added in the third mixing step. The method according to claim 1,
The present invention relates to a method for improving the water retaining ability of a dry coal ash, which comprises 30 to 80% of the dry coal ash, 6 to 10% of a rock surface, 1 to 3% of fossil oak, 1 to 3% of coconut, 10 to 30% of peatmoss, 7 to 13% 3.0% by weight of the dry coal ash. The method according to claim 1,
Wherein the dry coal ash is a bottom ash having an average particle size of 0.15 to 5.0 mm or a middle ash having a particle size of 0.15 mm or more. The method according to claim 1,
Wherein a pH lowering agent is further added to adjust the pH of the dry coal ash. The method according to claim 1,
Wherein the water retention enhancer is formed by dispersing a porous mineral, vegetable fiber and fertilizer in a polymerized super-absorbent polymer by controlling crosslinking degree between binding elements. 6. The method of claim 5,
Wherein the porous mineral is bentonite or zeolite, and the vegetable fiber is a coconut fiber. The method according to claim 1,
Wherein nitrogen (N), phosphoric acid (P2O5), and gallic acid (K2O) are further added to the water retention enhancer. The method according to claim 1,
Wherein the water is introduced into the first mixing step so as to have a volume of 80 to 120% based on the sum of the dry coal ash, the rocky surface, and the fossil stone (oyster shell). The method according to claim 1,
Wherein water is further added and mixed in the secondary mixing step so as to have a volume of 80 to 120% based on the sum of the coco peat, the peat moss, and the total amount of the compost soil. A dry coal ash, a rock surface, a fossil stone (oyster shell), a cocofit, a peat moss, a fecal soil and a superabsorbent polymer. 11. The method of claim 10,
The present invention relates to a method for improving the water retaining ability of a dry coal ash, which comprises 30 to 80% of the dry coal ash, 6 to 10% of a rock surface, 1 to 3% of fossil oak, 1 to 3% of coconut, 10 to 30% of peatmoss, 7 to 13% Lt; RTI ID = 0.0 &gt;%&lt; / RTI &gt; 11. The method of claim 10,
The rock surface is obtained by removing the foreign matter from the collected lung cancer surface, sterilizing it at 120 to 180 ° C for at least 30 minutes and then pulverizing it to an average particle size of 2 to 10 mm to remove microbial contamination. The feldspar is calcined, Artificial soil using dry coal ash characterized by using granular fossils of ~ 5 mm in size.

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