KR102067078B1 - Slow release fertilizer using dolomite and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a slow-release fertilizer using dolomite, and a method for manufacturing the same. The slow-release fertilizer using dolomite according to the present invention includes nitrogen, phosphoric acid, potash, dolomite powder, phosphorous acid and water as raw materials. By the configuration, the present invention is to manufacture the fertilizer using the dolomite powder, thus there is no floating in use and no solidification during storage, and the number of application can be reduced since the fertilizer can be eluted for a long time with one application.

Description

Slow fertilizer using dolomite and its manufacturing method {SLOW RELEASE FERTILIZER USING DOLOMITE AND MANUFACTURING METHOD THEREOF}

The present invention relates to a slow-fertilizing fertilizer using dolomite and a method for manufacturing the same, and more particularly, to prepare a fertilizer using dolomite powder, there is no floating in use, it does not solidify during storage and is eluted for a long time with one fertilizer fertilization. The present invention relates to a slow-fertilizing fertilizer using dolomite and a method for producing the same.

Nutrients that plant roots absorb from the soil include nitrogen, phosphoric acid, potassium oxide, calcium, magnesium and iron. Nitrogen plays a major role in growth as a major component of the protein that makes cells, especially for leafy vegetables and root vegetables. Phosphoric acid is a major component of the cell's nucleus and is required for normal cell activity. In particular, it affects flowers and seedlings, which improves the taste of the fruit, and the lack of phosphoric acid leads to markedly worse growth and poor early growth.

Calcium oxide is a major component of the cytoskeleton, which has the effect of strengthening leaves and stems, and is necessary to help fruit hypertrophy, and in the case of too much nitrogen, it inhibits the effect of nitrogen. Lime neutralizes the acidity of the soil, improving the absorption of fertilizers, making the soil prone to growing vegetables, and extending the roots well.

Goto (magnesium) makes chlorophyll, and when it is deficient, it becomes yellow between leaf veins. As mentioned above, nutrients play an important role in plant growth, but there is a problem in that the soil does not have enough nutrients as the plant desires, and that the nutrients in the soil are quickly exhausted by human continuous farming.

For this reason, fertilizers have become an essential element for the cultivation of plants, and the types of fertilizers also vary depending on the type of plant and the growth time. Fertilizers include chemical fertilizers and natural fertilizers. Natural fertilizers are difficult to obtain or store and are expensive.

Most chemical fertilizers are fast-acting, which dissolves quickly when fertilized in soil, and the soil is temporarily rich in nutrients immediately after fertilization. However, plants cannot absorb or use nutrients fertilized in a short period of time. As a result, nutrients left behind by plants cannot seep into the soil, causing contamination of soil, groundwater, and rivers.

Fertilizers can be divided into two types: fast-acting and slow-release fertilizers, and these shapes have a granular or liquid form. Fast-acting fertilizers are easy to decompose, and have an effective duration of about 15 to 20 days. Spray easily with a nebulizer.

Slow-fertilizers have a granular form, and fertilizers are slowly eluted for 30 to 120 days and do not need to be fertilized until the crop is harvested with only one fertilizer. Thus, slow-fertilizers do not require additional fertilization and reduce the amount of fertilizers that can reduce environmental pollution.

In general, the slow-fertilizer fertilizer particles are coated with a polymer to control the dissolution rate. The dissolution rate is controlled by varying the composition of the polymer or performing a multilayer coating.

Republic of Korea Patent Publication No. 194-0002203 is the first coating of the granular fertilizer surface with a copolymer of ethyl cellulose, polyvinylacetate, vinyl acetate and rosin, and then ethyl cellulose, benzyl cellulose, polyvinylacetate, nitrocellulose, vinyl acetate Disclosed is a particulate fertilizer coated with a copolymer of rosin and polymers such as acrylates and styrene. These granular fertilizers are disclosed to be easy to control the dissolution rate of fertilizer components in water and soil by the coating in two stages, and excellent sustaining effect, but at this time, due to the organic solvents such as toluene or benzene used for coating, Not only air pollution but also the safety of workers and the high risk of fire.

Accordingly, Korean Patent No. 10-0445536 proposes a slow-release granular fertilizer coated with fertilizer with an inverse core-shell polymer emulsion prepared by emulsion polymerization using water as a dispersion medium. The inverted core-shell polymer emulsion uses various kinds of acrylic monomers, crosslinkable monomers, silane compounds, etc., and polymerizes in multiple stages to form a network structure so that there is no change in dissolution rate due to no weather resistance and discoloration and no breakage of the chain. . However, there is a problem that the emulsion manufacturing process is complicated, the reaction is difficult, and the properties of the produced product are inconsistent. In addition, in the case of the silane compound used at this time, it is difficult to form a uniform coating film on the fertilizer particles due to a fish eye phenomenon, and when a fertilizer is loaded, it is solidified with each other, water is introduced, and floating occurs during fertilizer fertilization. Occurred.

In addition, the Republic of Korea Patent No. 10-641346 discloses a slow-effective granular fertilizer to single-coated two or more kinds of latex mixtures having different water vapor permeability on the surface of the granular fertilizer so that the fertilizer component is slowly eluted in the soil. At this time, the coating composition of polyvinylidene chloride latex having a very low water vapor permeability was mixed with the acrylic polymer in a proportion. However, the polyvinylidene chloride used at this time is a heavy specific gravity, on the contrary, the acrylic polymer has a light specific gravity, which causes phase separation during long-term storage during branding, yellowing and physical properties, as well as environmental problems.

Therefore, there is no problem in the environment, there is no floating in use, and solidification does not occur even if stored for a long time, and research and development of a slow-release composite fertilizer capable of controlling the dissolution rate is required.

In particular, the soil in Korea is coarse and the nutrients are less likely to lose fertilizers, which causes groundwater contamination and eutrophication of lakes and marshes. In addition, wages are on the rise due to a decrease in rural labor force and lack of rural work due to aging. Therefore, in order to solve this problem, it is inevitable to develop and supply a slow-acting fertilizer that does not need to be fertilized until the crop is harvested once the manure is applied.

Domestic Patent No. 10-1331454 (November 14, 2013 registration) Domestic Publication No. 10-2016-0078937 (July 05, 2016 release) Domestic Patent No. 10-1682768 (registered November 29, 2016)

The present invention is to provide a fertilizer using a dolomite to manufacture fertilizer using a dolomite powder, there is no floating in use, it does not solidify during storage, and elutes over a long period of time with one fertilizer fertilization to reduce the number of fertilizers and a method of manufacturing the same. have.

Various problems to be solved by the present invention are not limited to the above-mentioned problems, and other tasks not mentioned will be clearly understood by those skilled in the art from the following description.

Slow-fertilizing fertilizers using dolomite according to the present invention include nitrogen, phosphoric acid, kali, dolomite powder, phosphorous acid and water as raw materials.

The raw material may be included in a weight ratio of 5 to 40 parts by weight of nitrogen, 5 to 30 parts by weight of phosphoric acid, 5 to 35 parts by weight of kali, 5 to 40 parts by weight of dolomite powder, 0.1 to 40 parts by weight of phosphorous acid and 0.1 to 10 parts by weight of water. have.

The dolomite powder further includes any one or more selected from the group consisting of phosphite, limestone and magnesite, and any one or more selected from the group consisting of the phosphorite, limestone and magnesite is 5 to 15 parts by weight based on 100 parts by weight of the dolomite powder. It is contained in a weight ratio, and the phosphorous acid further includes any one or more selected from the group consisting of potassium phosphite, calcium phosphite and sodium phosphite, in the group consisting of the potassium phosphite, calcium phosphite and sodium phosphite relative to 100 parts by weight of the phosphite Any one or more selected may be included in the weight ratio of 10 to 30 parts by weight.

In addition, the method for producing a slow-acting fertilizer according to the present invention comprises a raw material preparation step (S100) for preparing the raw materials; A raw material mixing step of mixing the prepared raw materials in a predetermined weight ratio (S200); Reacting and curing the mixed raw materials to produce a raw material fertilizer solids, and a curing step (S300); And a molding step (S400) of forming the slow-fertilizer fertilizer to produce a slow-fertilizer.

The prepared raw materials in the raw material mixing step (S200) are 5 to 40 parts by weight of nitrogen, 5 to 30 parts by weight of phosphoric acid, 5 to 35 parts by weight of kali, 5 to 40 parts by weight of dolomite powder, 0.1 to 40 parts by weight of phosphorous acid and 0.1 parts of water. To 10 parts by weight may be included.

The dolomite powder in the raw material preparation step (S100) further includes any one or more selected from the group consisting of phosphite, limestone and magnesite, any one selected from the group consisting of the phosphate, limestone and magnesite relative to 100 parts by weight of the dolomite powder At least one is contained in a weight ratio of 5 to 15 parts by weight, and the phosphorous acid further includes any one or more selected from the group consisting of potassium phosphite, calcium phosphite and sodium phosphite, and the potassium phosphite and phosphorous acid based on 100 parts by weight of the phosphite Any one or more selected from the group consisting of calcium and sodium phosphite is included in a weight ratio of 10 to 30 parts by weight, and the molding step (S400) may be molded to a diameter of 30 to 50mm by using a press method.

Specific details of other embodiments are included in the detailed description.

According to the present invention, a fertilizer is prepared using dolomite powder, and thus, there is no floating in use, it does not solidify during storage, and it is possible to prepare a slow-release fertilizer which can be eluted for a long time by one fertilizer application.

It will be fully understood that embodiments of the inventive concept may provide various effects that are not specifically mentioned.

1 is a flow chart illustrating a method for producing a slow-fertilizing fertilizer using the dolomite according to the present invention.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and to fully convey the spirit of the present invention to those skilled in the art.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the method for producing a slow-acting fertilizer using the dolomite according to the present invention.

1 is a flow chart illustrating a method for producing a slow-fertilizing fertilizer using the dolomite according to the present invention.

Referring to Figure 1, the method for producing a slow-fertilizing fertilizer using the dolomite according to the present invention includes a raw material preparation step (S100), raw material mixing step (S200), raw material reaction and curing step (S300) and forming step (S400). .

1. Raw material preparation step (S100)

The raw material preparation step (S100) is a step of preparing the raw materials for producing a slow fertilizer.

In the raw material preparation step (S100), the raw materials may be prepared with nitrogen, phosphoric acid, kali, dolomite powder, phosphorous acid and water.

In the present invention, the dolomite powder may further include any one or more selected from the group consisting of phosphite, limestone and magnesite, and at least one selected from the group consisting of the phosphate, limestone and magnesite with respect to 100 parts by weight of the dolomite powder is 5 To 15 parts by weight may be included.

The rock phosphate is an ore containing a large amount of calcium phosphate as a representative material, such as apatite, phosphate, guano, etc., and is the main raw material of phosphate fertilizer. The phosphate ore is used in the fertilizer composition by using the principle that a natural compound composed of phosphoric acid, nitrogen (N), calcium oxide (CaO), and magnesium oxide (MgO) is dissolved in 2% citric acid.

Phosphoric acid contained in the ore is dissolved in citric acid and converted into free phosphoric acid, which is produced by black fungus (Aspergillus niger) and used for decomposition of phosphoric acid. Calcium and phosphorus are the major constituents of phosphate ore, and the ratio of calcium and phosphorus determines the water solubility, the solubility and the insolubility of the phosphate fertilizer prepared from phosphate ore. As a result, the smaller the phosphorus content is, the more soluble it is, the longer the fermentation is, the more the sustainability of the fertilizer is increased, and the higher the absorption rate of the phosphoric acid in the plant increases the value of the fertilizer.

The limestone is a sedimentary rock containing calcium carbonate (CaCO ₃ ) as a main component (more than 50% by weight), and localized limestone, particles that are formed by chemical precipitation or migrated from one place to another. It is composed of Tajiki limestone.

In general, the limestone is a fine grain-shaped, non-structured rock, which is white or gray, and the impurity is dark gray or black. There may be a case of forming a rocky or dome-like rock body, such as a coral reef, called a parachute, and being sandwiched between strata. It is produced by sedimentation and fixed organically by living organisms that secrete carbonates of carbonate at relatively high pH where there is little ground sediment supplied from land, or by inorganic chemical action directly in seawater.

The magnesite is a kind of calcite belonging to the carbonate mineral, which is a magnesium carbonate mineral (MgCO ₃ ) which is a main raw material of magnesium. The magnesite is formed by the alteration of magnesium-rich rock or by reaction between magnesium-containing solution and calcite, and magnesite is used as a raw material of refractory materials, catalysts, fillers for the production of synthetic rubbers and magnesium chemicals and fertilizers. Used.

The dolomite powder may be a fine powder obtained by pulverizing the dolomite. The dolomite is also called dolomite or high limestone, and is composed of a chemical component of CaMg (CO ₃ ) ₂ . In nature, limestone forms the largest amount of carbonate rock. The dolomite crystal form corresponds to a trigonal system, and lime carbonate (CaCO ₃ ) and magnesium carbonate (MgCO ₃ ) form a bicarbonate 1: 1.

In addition, the firmness of the dolomite 3.5 to 4, specific gravity of 2.8 to 2.9, there is a complete cleavage (cleavage) in the rhombus direction, depending on the white, gray or trace impurities, pink, yellow, brown, green. It is transparent or translucent and has a glass luster, and the crystal sometimes has a pearl luster. In addition, the dolomite is similar to calcite in appearance, so it is difficult to distinguish, but the density is slightly larger and slightly heavier. The easiest way to distinguish is to observe the degree of foaming by dilute hydrochloric acid. Dolomite is very poorly foamed compared to calcite with a high degree of foaming.

On the other hand, in the present invention, the dolomite powder may be a fine powder dolomite produced by pulverizing the dolomite, it is also possible to use the dolomite powder prepared by the following manufacturing method.

First, in order to prepare the dolomite powder used in the present invention, the dolomite powder may be prepared by pulverizing first and then pulverized first, and the dolomite may be lime carbonate (CaCO ₃ ) and magnesium carbonate (MgCO ₃ ). Dolomite existing in nature forming a bicarbonate in a 1: 1 may be used, and the primary grinding of the dolomite may be performed using a known mill. In addition, the primary grinding of the dolomite may grind the dolomite in the length range of 10 to 100mm.

Next, the primary pulverized dolomite powder may be calcined.

Firing of the primary pulverized dolomite may remove and activate contaminants adsorbed to the fine pores of the primary pulverized dolomite powder by heating the dolomite in a calcination furnace. Firing of the primary pulverized dolomite powder may be performed by heating for 1 to 2 hours at a temperature of 1000 to 1400 ℃.

Subsequently, the calcined dolomite powder may be secondly ground to prepare a second milled dolomite powder. The second milling of the dolomite may be performed using a known mill, and the second milling of the dolomite is performed. The primary pulverized dolomite powder may be pulverized in the length range of 100 to 1000㎛.

The present invention can use the dolomite powder prepared as described above, in order to be able to exert anion generation, antibacterial and deodorizing effect, such as dolomite powder can be mixed in the dolomite powder. The gelite may be used by mixing in a weight ratio of 2 to 6 parts by weight based on 100 parts by weight of the dolomite powder, the gelite may be used in the gellite prepared by the following manufacturing method.

The gellite may be ground using a ball milling device after preparing a mineral pozzolan, and the pozzolan has a particle diameter of 100 to 500 µm and a specific surface area of 1000 to 3000 m ² / g. It may be ground to have.

When the pozolan is ground to a particle size of 100 μm or less than a specific surface area of 1000 m ² / g, the grinding time may be delayed and workability may be deteriorated by dust or fine powder, and the particle size of 500 μm or 3000 m ² When the pulverization exceeds a specific surface area of / g may cause a problem that the active ingredients contained in the pojoran egg is not easily extracted.

Next, the crushed pozzo eggs can be heated to heat treatment.

In this step, impurities and residual organic matters contained in the ground pozzo eggs may be removed by heating the ground pozzo eggs. The heat treatment of the pojo eggs may be performed at a temperature of 1000 to 1200 ° C. for 10 to 30 minutes. have.

If the heat treatment of the pojoran is less than 1000 ℃ or less than 10 minutes, the impurities or residual organic matter contained in the pojoran may not be sufficiently removed, a temperature of more than 1200 ℃ or 30 minutes If it goes beyond, it may be difficult to expect a further increase in effect.

Next, after washing the heat treated pozzo eggs to remove the combustion residues attached to the surface of the pozzo eggs, the washed pozzo eggs may be aged by immersing in purified water.

In the step of washing the pozzolan may wash the surface of the pozzolan using distilled water or purified water, for example, the pojoran washing the surface of the pozzolan with purified water of 70 to 80 ℃. By proceeding.

In addition, aging of the pojoran in the step may be carried out by mixing 150 to 250 parts by weight of purified water at a temperature of 40 to 50 ℃ with respect to 100 parts by weight of the washed pojoran, then sealed for 5 to 10 days.

In the present invention, by mixing the pojoran with purified water as described above and sealed for a certain time, the active ingredients contained in the pojoran can be easily leached into the purified water.

Subsequently, after removing and removing pozzolan from the purified water, the purified water may be centrifuged.

In the present invention, by aging the pojoran in purified water, the active ingredients of the pojoran are leached in the purified water, by centrifuging the purified water in which the active ingredients of the pojoran are leached, the lower layer where the fine particles of pojoran are located It can be separated and separated into a liquid, and a stratified liquid and a supernatant liquid located above the lower layer liquid.

Next, after separating the supernatant and the supernatant of the centrifuged purified water, it is possible to prepare a gelite by heating the supernatant and the supernatant.

In the step, after separating the supernatant and the supernatant of the centrifuged purified water, it is possible to prepare a gellite formed by leaching the active ingredients of pozzolan by removing the moisture by heating to a temperature of 110 to 120 ℃.

The phosphorous acid has a chemical formula of H ₃ PO ₃ and is used as a reducing agent in chemical analysis. The phosphorous acid is a white or yellow crystalline substance, which has a melting point of about 73 ° C., and is an unstable compound having oxygen, or 180 ° C. When heated above it is a phosphoric acid (H ₃ PO _4). Phosphorous acid can also form phosphites, which are used as reducing agents. Phosphorous acid is obtained by dissolving hexavalent oxide (P ₄ O ₆ ) or phosphorus trichloride (PCl ₃ ) in water.

In the present invention, the phosphorous acid may further include any one or more selected from the group consisting of potassium phosphite, calcium phosphite and sodium phosphite, which is selected from the group consisting of the potassium phosphite, calcium phosphite and sodium phosphite relative to 100 parts by weight of the phosphite One or more may be included in the weight ratio of 10 to 30 parts by weight.

2. Raw material mixing step (S200)

The raw material mixing step (S200) is a step of mixing the prepared raw materials in a predetermined weight ratio.

In the raw material mixing step (S200), the prepared raw materials are 5 to 40 parts by weight of nitrogen, 5 to 30 parts by weight of phosphoric acid, 5 to 35 parts by weight of kali, 5 to 40 parts by weight of dolomite powder, 0.1 to 40 parts by weight of phosphorous acid and water It may be mixed in a weight ratio of 0.1 to 10 parts by weight.

3. Raw material reaction and curing step (S300)

The raw material reaction and curing step (S300) is a step of producing a slow-acting fertilizer solid by reacting and curing the mixed raw materials.

In the raw material reaction and curing step (S300), dolomite powder, phosphorous acid, and water are reacted among the mixed raw materials to generate dolomite hydroxide, and then insolubilized to proceed.

That is, the dolomite is a part of the deoxidation reaction by the exothermic reaction with the addition of water to the phosphorous acid to obtain a mixture of calcium oxide (CaO) and magnesium oxide (MgO), if the water is continuously added to the calcium hydroxide (Ca ( OH) ₂ ) and magnesium hydroxide (Mg (OH) ₂ ) is a mixture of dolomite hydroxide.

In addition, the calcium hydroxide of the dolomite prepared as described above and the phosphate compound react to form phosphate apatite (Ca ₅ (PO ₄ ) ₃ (OH)) to insolubilize to proceed.

That is, the slow-fertilizing fertilizer using the dolomite according to the present invention can be prepared using a reaction process in which the dolomite powder reacts with phosphorous acid and water to generate heat of hydration and is thermally cured.

The reaction is as follows.

3Ca ²⁺ + 2PO ₄ ² --> Ca (PO ₄ ) ₂ ↓

_{^{5Ca 2+ + OH - + 3PO 4}} 3- -> Ca 5 (OH) (PO 4) 3 ↓

In the present invention, the phosphate apatite containing nitrogen, phosphoric acid and potassium components as described above may have a function of a relaxing fertilizer.

4. Molding step (S400)

The molding step (S400) is a step of producing the fertilizer fertilizer by molding the slow fertilizer solids.

In the forming step (S400), the slow-fertilizer solids may be manufactured into a complete fertilizer by molding into a shape and size suitable for fertilization. For example, the slow-fertilizer solids may be vibrated mold molding, pressing (press) molding, or pellets. It can be molded into a slow-release fertilizer having various shapes and sizes through pellet molding, die molding, and the like. The shape and size of the slow-fertilizing fertilizer may be selected in consideration of conditions such as soil type, quality, form, and the type of plant to be grown. Preferably, the fertilizing fertilizer is press-molded in the forming step (S400). It can be configured to have a diameter of 30 to 50mm by using.

As mentioned above, although one preferred embodiment of the present invention has been described, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Could be. Therefore, it should be understood that one embodiment described above is illustrative in all respects and not restrictive.

Claims (6)

Nitrogen, phosphoric acid, kali, dolomite powder, phosphorous acid and water as raw materials,
The raw material is 5 to 40 parts by weight of nitrogen, 5 to 30 parts by weight of phosphoric acid, 5 to 35 parts by weight, 5 to 40 parts by weight of dolomite powder, 0.1 to 40 parts by weight of phosphorous acid and 0.1 to 10 parts by weight of water. ,
The dolomite powder further includes any one or more selected from the group consisting of phosphite, limestone and magnesite, and any one or more selected from the group consisting of the phosphorite, limestone and magnesite is 5 to 15 parts by weight based on 100 parts by weight of the dolomite powder. Included in weight ratio,
The phosphorous acid further includes any one or more selected from the group consisting of potassium phosphite, calcium phosphite and sodium phosphite, at least one selected from the group consisting of potassium phosphite, calcium phosphite and sodium phosphite relative to 100 parts by weight of the phosphite It is included in the weight ratio of 30 to 30 parts by weight,
The dolomite powder is prepared by preliminarily pulverizing the dolomite powder after preparing the dolomite, and then pulverizing the primary pulverized dolomite powder. Is carried out by heating for 1 to 2 hours at a temperature of 1000 to 1400 ℃, is prepared through a process of grinding the calcined dolomite powder into a length range of 100 to 1000 ㎛,
Gelolite is further mixed with the dolomite powder, but the gellite is used by mixing in a weight ratio of 2 to 6 parts by weight based on 100 parts by weight of the dolomite powder,
The gellite, after preparing the pojoran egg has a particle size of 100 to 500㎛, and pulverized to have a specific surface area of 1000 to 3000m ² / g, and heat-treated by heating the crushed pojoran egg, the heat treatment of the pojoran egg Is carried out for 10 to 30 minutes at a temperature of 1000 to 1200 ℃, washing the heat-treated pozzo eggs to remove the combustion residues attached to the surface of the pozzo eggs, and then immersed in the purified water After maturation, washing of the pozzolan washes the surface of the pozzolan with purified water at 70 to 80 ° C., and the maturation of the pozzo eggs is carried out at 150 to 40 ° C. with purified water at a temperature of 40 to 50 ° C. relative to 100 parts by weight of the washed pojoran. After mixing 250 parts by weight, it proceeds by sealing and storing for 5 to 10 days, after separating and removing the pozzo eggs from the purified water, the purified water by centrifugation to fine particles of pozzo eggs After separating and separating the lower layer liquid and the supernatant liquid and the supernatant liquid located above the lower layer liquid, and separating the supernatant liquid and the supernatant of the centrifuged purified water, the supernatant liquid and the supernatant liquid A slow-acting fertilizer using dolomite, characterized in that it is prepared by heating to a temperature of 110 to 120 ℃.
delete delete Raw material preparation step of preparing the raw material (S100);
A raw material mixing step of mixing the prepared raw materials in a predetermined weight ratio (S200);
Reacting and curing the mixed raw materials to produce a raw material fertilizer solids and a curing step (S300); And
Including the molding step (S400) to form the slow-fertilizer fertilizer to produce a slow-fertilizer,
In the raw material preparation step (S100), the raw materials are prepared with nitrogen, phosphoric acid, kali, dolomite powder, phosphorous acid and water, and the dolomite powder further includes any one or more selected from the group consisting of phosphate, limestone and magnesite. Any one or more selected from the group consisting of the phosphate, limestone and magnesite with respect to 100 parts by weight of dolomite powder is included in a weight ratio of 5 to 15 parts by weight, and the phosphorous acid is selected from the group consisting of potassium phosphite, calcium phosphite and sodium phosphite One or more is further included, any one or more selected from the group consisting of the potassium phosphite, calcium phosphite and sodium phosphite relative to 100 parts by weight of the phosphite is included in a weight ratio of 10 to 30 parts by weight,
The dolomite powder is prepared by preliminarily pulverizing the dolomite powder after preparing the dolomite, and then pulverizing the primary pulverized dolomite powder. Is carried out by heating for 1 to 2 hours at a temperature of 1000 to 1400 ℃, is prepared through a process of grinding the calcined dolomite powder into a length range of 100 to 1000 ㎛,
Gelolite is further mixed with the dolomite powder, but the gellite is used by mixing in a weight ratio of 2 to 6 parts by weight based on 100 parts by weight of the dolomite powder,
The gellite, after preparing the pojoran egg has a particle size of 100 to 500㎛, and pulverized to have a specific surface area of 1000 to 3000m ² / g, and heat-treated by heating the crushed pojoran egg, the heat treatment of the pojoran egg Is carried out for 10 to 30 minutes at a temperature of 1000 to 1200 ℃, washing the heat-treated pozzo eggs to remove the combustion residues attached to the surface of the pozzo eggs, and then immersed in the purified water After maturation, washing of the pozzolan washes the surface of the pozzolan with purified water at 70 to 80 ° C., and the maturation of the pozzo eggs is carried out at 150 to 40 ° C. with purified water at a temperature of 40 to 50 ° C. relative to 100 parts by weight of the washed pojoran. After mixing 250 parts by weight, it proceeds by sealing and storing for 5 to 10 days, after separating and removing the pozzo eggs from the purified water, the purified water by centrifugation to fine particles of pozzo eggs After separating and separating the lower layer liquid and the supernatant liquid and the supernatant liquid located above the lower layer liquid, and separating the supernatant liquid and the supernatant of the centrifuged purified water, the supernatant liquid and the supernatant liquid It is prepared through a process of heating to a temperature of 110 to 120 ℃,
In the raw material mixing step (S200), the prepared raw materials are 5 to 40 parts by weight of nitrogen, 5 to 30 parts by weight of phosphoric acid, 5 to 35 parts by weight of kali, 5 to 40 parts by weight of dolomite powder, 0.1 to 40 parts by weight of phosphorous acid and water Mixed in a weight ratio of 0.1 to 10 parts by weight,
In the forming step (S400), the method of producing a slow-fertilizing fertilizer using dolomite, characterized in that the molding to form a diameter of 30 to 50mm by using a press method. delete delete

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