KR102525596B1 - Method for Manufacturing Fertilizer Containing Seawater Minerals - Google Patents

Abstract

The present invention relates to a method for preparing a fertilizer that allows crops to uniformly and easily absorb these components by mixing mineral concentrated water obtained from seawater with an aqueous dispersion of sulfur and illite having improved dispersibility in water.
The fertilizer produced by the method of the present invention uses seawater as the main material, so the manufacturing cost is reduced, and various mineral components of seawater are included, so it is effective for crop growth. Fertilizer can be supplied to crops, and the absorption rate of crops is high due to the fine size of the particles, energy costs can be saved when producing concentrated mineral water, and heavy metals contained in seawater can be removed to prevent harmful effects on the human body. there is.

Description

Method for manufacturing fertilizer containing mineral components of seawater {Method for Manufacturing Fertilizer Containing Seawater Minerals}

The present invention relates to a method for preparing a fertilizer that allows crops to uniformly and easily absorb these components by mixing mineral concentrated water obtained from seawater with an aqueous dispersion of sulfur and illite having improved dispersibility in water.

In order to meet the demand for food due to the rapid development of industry and population growth, production per unit area of arable land must be increased, and accordingly, the use of pesticides and chemical fertilizers has been rapidly expanding. Farmland is gradually degraded as it leads to acidification and soil acidification.

In general, soil fertilization is for high yield, and the effect of increasing crop yield can be obtained, but excessive use of fertilizer increases the production cost of agricultural products and is disadvantageous in terms of environmental preservation, and removes pests and diseases that occur during crop growth. The excessive use of pesticides increases the resistance of pathogens and harmful nematodes present in the soil, and thus the vicious cycle of using a large amount of pesticides again is repeated.

In order to solve the above problems, agricultural methods using organic fertilizers or compost instead of chemical fertilizers or pesticides have been developed, and efforts to improve the compost fermentation method using microorganisms have been continuously attempted.

However, despite these efforts, the intensive use of organic fertilizers instead of chemical fertilizers is only materially different due to the lack of understanding of the root cause of soil degradation and lack of alternatives. This is exacerbating another similar problem.

In addition, organic fertilizers are mostly used in most cases where sawdust, plant waste, fish meal or livestock meal and natural organic substances mixed with them are used. In order to ferment them to produce organic fertilizer, time, manpower and equipment according to microbial fermentation are required, which is suitable for farms. It is not only a burden, but also causes water pollution due to the generation of wastewater due to the production of organic fertilizers.

Long-term use of fertilizers containing excessive amounts of organic matter can damage crop growth, and ammonia gas can be generated in the process of decaying livestock meal or fish meal, which can damage crop roots. Calcium absorption is inhibited due to excess ammonia due to an imbalance of ammonia, and such organic fertilizers have disadvantages as fertilizers such as the fact that crops are vulnerable to pests and diseases due to lack of trace elements necessary for crop growth.

On the other hand, inorganic fertilizers contain inorganic components such as nitrogen (N), phosphorus (P), potassium (K), magnesium (Mg), lime (Ca), and boron (B), and are mass-produced in factories, so the quality is low. Uniform, stable supply, low price, hygienic and easy to use compared to organic fertilizer or compost, high and constant content of active ingredients such as nitrogen and phosphorus, low transportation cost and easy storage It is widely used in most farmhouses for reasons such as the fact that fertilization suitable for the purpose is possible.

However, excessive use of inorganic fertilizers not only damages crops in the long run, such as acidification of soil and reduction of organic matter content, reducing soil productivity, but also destroys soil aggregation, causes lack of organic matter in soil, and reduces aeration. and deterioration of water retention, thereby adversely affecting the growth of crops.

In addition, if the soil lacks minerals, which are trace elements, even if a large amount of organic and inorganic fertilizers are supplied, various components essential for crop growth are not efficiently absorbed, so a continuous supply of minerals is necessary for crop growth.

Accordingly, in the field of agriculture and horticulture, research and development on nutrients or fertilizers that can effectively provide these minerals are being conducted. For example, Korean Patent Registration No. 1718211 discloses vanadium, chromium, selenium, germanium, A method for preparing a liquid fertilizer composition using a far-infrared ray emitting solution in which useful microorganisms are cultured, a pest control solution obtained from plants, edible oil, and legal sulfur solution containing the mineral components of is proposed.

The above invention not only sterilizes and kills germs and insects by containing pest control liquid and legal sulfur liquid obtained from plants, but also promotes absorption of nitrogen and phosphoric acid as the mineral ingredients and legal sulfur ingredients are contained. It provides an effect that can increase the yield of crops compared to fermented fertilizers.

However, since the liquid fertilizer contains cooking oil, the cooking oil is effective in killing soil germs, but it also kills useful microorganisms in the soil and useful microorganisms contained in the liquid fertilizer, and the oil film of cooking oil prevents plant roots from absorbing nutrients. adversely affect plant growth.

In addition, since the mineral components are relatively expensive materials, the manufacturing cost is high when they are purchased and used as fertilizer materials, and these mineral components are precipitated during storage of the liquid fertilizer and, in severe cases, the precipitate hardens, making it difficult for the fertilizer to maintain uniform components. there is

In order to solve these disadvantages, the present inventors proposed a method for producing fertilizer using seawater through Korean Patent Registration No. 1777841, and the present invention precipitates and removes salt by filtering and heating brine using seawater or bay salt Then, it is filtered and concentrated with activated carbon to obtain concentrated mineral water, and a fertilizer is prepared by mixing an aqueous dispersion of sulfur, an aqueous dispersion of illite, and kelp powder in the concentrated mineral water.

The fertilizer prepared as described above contains various minerals of seawater, and alginic acid of kelp binds to minerals, sulfur, and illite particles and acts as a dispersant that prevents aggregation of particles, thereby suppressing the generation of sediment due to aggregation.

However, since the fertilizer manufacturing method heats and concentrates seawater, energy costs are high, and since alginate eluted from kelp into water is viscous, it also acts to agglomerate particles, so the dispersion effect of the particles is not great. Heavy metals are contained, so if seawater is used as a fertilizer to prepare fertilizers, heavy metals in seawater contaminate the soil and may enter the human body through crops, so a plan to solve these disadvantages is required.

The present invention is to solve the above problems, to provide a method for producing a fertilizer that is uniformly dispersed in water while finely pulverizing fertilizer component particles in an economical way while preparing the fertilizer using seawater.

In order to solve the above problems, the present invention seawater; Salt water mixed with water so that the sea salt content is 20 to 25% by weight; or a mixture thereof; adding sodium hydroxide to adjust the pH to 8-10 and stirring at 50-90 rpm for 10-30 minutes, filtering the stirred seawater, brine or a mixture thereof with a 100-200 mesh filter To obtain filter filtrate from which foreign substances are removed, heating the filter filtrate to a temperature of 40 to 60 ° C. to precipitate salt, and then removing the precipitated salt, using activated carbon with cetylpyridinium chloride at a concentration of 5 to 15 mM immersing in an aqueous solution for 10 to 15 hours and then removing cetylpyridinium chloride, filtering the salt-removed filter water with activated carbon from which cetylpyridinium chloride has been removed to obtain activated carbon filtered water, heating and concentrating the activated carbon filtered water to obtain a solid content Obtaining concentrated mineral water having a content of 30 to 40 Brix, 10 to 20% by weight of sulfur, 0.1 to 2.0% by weight of natural starch, and the rest of the water are mixed and pulverized to prepare a sulfur aqueous dispersion having an average particle size of 30 μm or less 10 to 20% by weight of illite, 0.1 to 2.0% by weight of acetylated starch or octenyl succinate starch adjusted to pH 4.5 or less, and the rest of the water are mixed and pulverized so that the average particle size of illite particles is 3 μm It provides a method for producing a fertilizer comprising the steps of preparing an illite aqueous dispersion and mixing 2 to 7 parts by weight of a sulfur aqueous dispersion and 5 to 12 parts by weight of an illite aqueous dispersion with 100 parts by weight of the mineral concentrated water.

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At this time, between the step of obtaining the filter filtrate and the step of removing the salt, a step of removing moisture by introducing the filter filtrate into the natural evaporation device 10 is added, and the natural evaporation device 10 filters the filtered water 1 A water tank (2) accommodating the water tank (2), a pump (3) for transferring the filtered water (1) of the water tank (2) to the drying frame (4), installed on the top of the water tank (2) and drawn from the pump (3) A drying frame 4 for distributing the filtered water to be filtered to the cloth 5 and a plurality of hanging from the drying frame 4 and inducing the filtered water distributed from the drying frame 4 to flow down to the lower water tank 2 It is more preferable to include a cloth (5) of.

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In addition, it is preferable to adjust the pH of the illite aqueous dispersion to 5.0 to 6.5 and then mix it with concentrated mineral water and sulfur aqueous dispersion.

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The fertilizer produced by the method of the present invention uses seawater as the main material, so the manufacturing cost is reduced, and various mineral components of seawater are included, so it is effective for crop growth. Fertilizer can be applied to crops.

In addition, since the particle size is fine, the absorption rate of crops is high, energy costs can be reduced when producing concentrated mineral water, and heavy metals contained in seawater can be removed to prevent harmful effects on the human body.

1 is a diagram schematically showing an apparatus for naturally evaporating water from seawater or sea salt.

The present invention is a mineral concentrated water obtained by heating and concentrating salt water (sun-dried salt water) in which seawater or sea salt is dissolved in water, a sulfur aqueous dispersion obtained by mixing sulfur and starch with water, and mixing illite and starch with water. Fertilizer is prepared by mixing the pulverized illite aqueous dispersion.

Seawater contains various minerals, including nutrients such as nitrogen, phosphoric acid, and silicon, necessary for the growth of animals and plants, but there is an excess of sodium chloride in seawater, so it is concentrated while removing a certain amount of chlorine and sodium. Water can be used as mineral concentrated water.

The mineral concentrated water reduces the sodium and chlorine content that hinders crop growth in large quantities and contains a large amount of minerals necessary for crop growth, and has a magnesium content of 4 to 6%, a sodium content of 2 to 5%, and a potassium content It mainly contains 1~3%, calcium content of 0.2~0.7%, etc., and becomes a liquid mineral containing various other minerals.

In general, liquid fertilizers in which minerals such as magnesium, potassium, and calcium are mixed in water have low solubility in water of these minerals, and thus only a small amount is absorbed by crops, and the absorption rate is low, but the mineral concentrated water of the present invention is salt in seawater. Since the components are removed and minerals are not precipitated and exist in a sufficiently dissolved state, crops can easily absorb them, so the effectiveness of minerals is high.

Therefore, when the liquid mineral is used as a fertilizer, it acts as a source of various minerals, which are essential elements for crop growth, and can supply various nutrients through the root or side of the crop to help crop growth and supplement the lack of minerals in the soil. Soil improvement effect can be shown.

As a raw material for the mineral concentrated water, salt water obtained by dissolving sea salt in water may be used instead of sea water, and the prepared sea water concentrated water and natural sea salt concentrated water may be mixed and used as mineral concentrated water.

withdrawn seawater; Salt water mixed with water so that the sea salt content is 20 to 25% by weight; or a mixture thereof; filtering through a 100 to 200 mesh filter to obtain filter filtrate from which foreign substances are removed, heating the filter filtrate at a low temperature of 40 to 60 ° C to precipitate salt, precipitation in the filter filtrate removing salt and filtering with activated carbon to obtain activated carbon filtrate, and heating and concentrating the activated carbon filtrate to obtain mineral concentrated water.

However, if seawater or seawater is heated and concentrated to the above concentration, energy costs are high, and natural evaporation in the sun to lower the water content takes too long for concentration. It is desirable to lower

To this end, it is preferable to put the filtered water from which foreign substances in the seawater or sea salt water have been removed into a natural evaporation device to first remove moisture and then heat it to precipitate salt. energy costs can be reduced.

In addition, moisture can be removed by the Yang-dry method, which is a natural drying method, before the filtered water is put into the natural evaporation device. Yang-drying is a process of removing some moisture from seawater or brackish water of low salinity, so it takes less time. As it is consumed, the operation efficiency of the natural evaporation device can be increased.

As shown in FIG. 1, the natural evaporation device 10 includes a water tank 2 accommodating the filtered water 1 from which foreign substances in seawater or sea salt water are removed, and the filter filtered water 1 of the water tank 2 is dried on a drying frame ( 4), a drying frame 4 installed on the top of the water tank 2 and distributing the filtered water drawn from the pump 3 to the cloth 5, and the drying frame 4 It includes a plurality of cloths 5 that are suspended and guide the filtered water distributed from the drying frame 4 to flow down to the water tank 2 below.

That is, the filtered water 1 is accommodated in the water tank 2 of the natural evaporation device 10, and then transferred to the drying frame 4 by the pump 3, distributed in the drying frame 4, and a plurality of hanging downwards. It naturally flows down by its own weight on the cloth (5) of the water tank (2), and while this circulation process is repeated, the moisture of the filter filtrate flowing down the cloth (5) evaporates and is removed by sunlight and wind do.

The cloth 5 is preferably a non-woven fabric installed in the form of a pleated curtain and spaced a certain distance from the filter water 1 accommodated in the water tank 2. The non-woven fabric has many internal voids, is lightweight, and has excellent air permeability. Since the moisture content is high, the time to remove moisture in the filter filtrate is increased by lowering the flow rate of the filter filtrate, and the moisture in the filter filtrate is quickly removed because the air is well ventilated. The contact area is large, so moisture evaporation is performed efficiently.

In addition, a transparent roof that can block foreign substances or rain while passing sunlight is installed on the upper part of the natural evaporation device 10, and the side is open to allow air to pass through, and a blower (not shown) may be installed to supply air from the side. .

As described above, if a certain amount of water is removed in advance through the natural evaporation device 10 before heating the filter filtered water from which foreign substances are removed from seawater or sea salt, energy costs until salt is deposited can be reduced.

Sea salt, a material of seawater or sea salt, is taken or manufactured from sea water in coastal waters. The inflow of domestic sewage and industrial wastewater tends to increase gradually, and the inflowed heavy metal components are contained in fertilizers, contaminate the soil, and enter the human body through crops, which can cause fatal diseases to human health.

Therefore, it is necessary to remove heavy metal components in seawater or brine in which sea salt is dissolved in water. It is preferable to obtain filtered water by filtering with a filter after stirring slowly for 30 minutes.

When sodium hydroxide is added to seawater or seawater and stirred, heavy metals in seawater or seawater react with sodium hydroxide to produce heavy metal hydroxides, and heavy metal hydroxides have a larger particle size than heavy metals, and heavy metal hydroxide particles interact to form flocculation ( flocculation) and can be filtered and removed through a 100 to 200 mesh filter.

The stirring speed and stirring time are optimal conditions for increasing the size of heavy metal hydroxide particles and forming flocs, and adjusting the pH of mineral concentrated water to alkalinity by adding sodium hydroxide helps to improve acidic soil.

Even if the fertilizer is alkaline due to the addition of sodium hydroxide, it is diluted during use and mixed with acidic soil, so the soil is slightly acidic or neutral, so the addition of sodium hydroxide does not interfere with the growth of crops.

While the filtered water passes through activated carbon, fine foreign substances contained in seawater or sea salt are filtered and removed. Chlorine ions are removed the most, and as anions are removed, the content of minerals such as magnesium, sodium, and potassium, which are cations, increases.

In order to increase the anion adsorption capacity of activated carbon, the surface of the activated carbon may be modified. For this purpose, the surface of the activated carbon is modified by contacting the activated carbon with cetylpyridinium choloride (CPC), a cationic surfactant, and a concentration of 5 to 15 mM When activated carbon is immersed in a CPC aqueous solution for 10 to 15 hours and then CPC is removed, the ability of activated carbon to adsorb anions is improved.

In addition, since the sodium chloride component contained in seawater or sea salt has the property of regenerating the modified activated carbon, there is an advantage in that a separate process of regenerating activated carbon can be omitted while adsorbing and removing anions from deep sea water.

As described above, mineral concentrated water is obtained by concentrating while removing chlorine and sodium in seawater or sea salt water, and about 30% of the salt component in seawater or salt water is removed and the solid content is 30 to 40 Brix. The prepared mineral concentrated water has a mineral hardness (magnesium and calcium content ratio) of 200000 to 300000, which is significantly higher than the mineral hardness of 15 to 50 of general agricultural water.

Sulfur enhances the absorption of fertilizer components such as nitrogen and phosphoric acid necessary for the growth of crops, increases the yield of crops, sterilizes and kills germs and insects, activates the physiological function of crops, and improves taste, sugar content, and coloration. It is an ingredient that helps improve quality by improving the back.

The fertilizer of the present invention uses an aqueous dispersion of sulfur containing 10 to 20% by weight of sulfur components to supplement the components lacking in the mineral concentrated water, and sulfur is highly toxic, causing crop growth obstacles and causing necrosis, yellowing, and browning. Side effects such as may appear. In order to solve these problems, it is preferable to use legal sulfur, and legal sulfur can reduce the toxicity of sulfur to solve the side effects on crops, but has the disadvantage of not being well absorbed by crops.

In addition, in order for sulfur to be easily absorbed by crops, the finer the sulfur particles, the better. However, since the fine-sized sulfur particles float in water and are not uniformly dispersed in water, the quality of the fertilizer becomes non-uniform.

Therefore, in the present invention, an aqueous dispersion of sulfur having an average particle size of 30 μm or less, preferably an average particle size of 5 to 25 μm is prepared by mixing sulfur with water using starch as a dispersing agent and pulverizing with a ball mill or nano mill, and the starch is It is viscous, so that sulfur particles of the above particle size floating in water within the above range are aggregated and uniformly dispersed in water.

10 to 20% by weight of sulfur, 0.1 to 2.0% by weight of starch, and the rest of the water are mixed and pulverized, and when less than 0.1% by weight of the starch is used, sulfur precipitates and is not dispersed and floats, and if it exceeds 2.0% by weight, As the size of the sulfur aggregate increases, it is undesirable to sink to the bottom.

Illite is a non-expandable clay mineral that is formed when potassium and magnesium are leached during weathering of mica clay minerals. It provides the effect of resolving the oversupply of mineral fertilizers as it can control the mineral balance to solve the oversupply of mineral components.

The fertilizer of the present invention includes an illite aqueous dispersion containing 10 to 20% by weight of such illite powder, and the illite aqueous dispersion supplements the insufficient components of the mineral concentrated water together with the sulfur aqueous dispersion.

Illite also finely pulverizes the particles to increase the absorption rate of crops like sulfur, adds starch to illite as a dispersant, mixes water, and grinds it with a ball mill or nano mill to have an average particle size of 3 μm or less, preferably an average An illite aqueous dispersion having a particle size of 0.5 to 2.5 μm is prepared.

Starch has surface activity along with viscosity, so when pulverized to the particle size of the sulfur aqueous dispersion, the viscosity acts strongly to agglomerate the sulfur particles floating in the water so that they are uniformly dispersed in water, but the illite aqueous dispersion When pulverized to a fine particle size, the surfactant effect is stronger than the viscosity, so that illite particles precipitated in water are suspended and uniformly dispersed in water.

10 to 20% by weight of illite, 0.1 to 2.0% by weight of starch, and the rest of the water are mixed and pulverized. If it is exceeded, the viscosity of the liquid fertilizer increases, which is undesirable because it may not be well sprayed during use.

Micro-sized sulfur particles float in water and micro-sized illite particles precipitate in water. In the present invention, as described above, the sulfur particle size is increased to provide conditions for sedimentation, and the illite particle size is reduced to float provide the conditions for this to happen.

In addition, the viscosity of starch inhibits the sliding of sulfur particles and illite particles to each other during the grinding process and has the effect of breaking particle bonds to increase grinding efficiency, so the time required to grind sulfur particles and illite particles to the above particle size size can be shortened.

Starch has viscosity and surface activity, but usually viscosity has a stronger effect than surface activity, so the starch used for sulfur aqueous dispersion is high in viscosity and cohesive force. It is preferable to use modified starch having high dispersibility by increasing the surface activity of silver.

As the modified starch, it is preferable to use acetyl starch or octenyl succinylated starch and adjust the pH to 4.5 or less, preferably to pH 3 to 4 to increase surface activity. It is more preferred to use starch sodium octenyl succinate.

Octenyl succinate starch has an emulsifying power because it has a hydrophobic octenyl group and a hydrophilic carboxyl group as substituents, and this modified starch uniformly disperses illite in water.

In the preparation of illite aqueous dispersion, as the grinding time increases, the illite particle size decreases and is converted from a suspension with low dispersibility to a stable dispersion containing colloidal microparticles. The dispersion stability is the lowest and the dispersion stability increases as the pH increases, so the dispersion stability is excellent at pH 9-12. It is preferable to adjust the illite aqueous dispersion, which has been completed, to a slightly acidic pH of 5.0 to 6.5 suitable for plant growth.

When sodium hydroxide is added to remove heavy metal components when preparing the concentrated mineral water, the pH concentration may become alkaline, but since the dispersion stability is high by using starch as a dispersion stabilizer, the pH is about 5.0 to 6.5, which is suitable for crop growth. can keep

Next, a fertilizer is prepared by mixing 2 to 7 parts by weight of an aqueous sulfur dispersion and 5 to 12 parts by weight of an illite aqueous dispersion with 100 parts by weight of the mineral concentrated water prepared above, and an aqueous sulfur dispersion containing 10 to 20% by weight of sulfur. If this amount exceeds 7 parts by weight, side effects may occur due to the toxicity of sulfur, and if the illite aqueous dispersion containing 10 to 20% by weight of illite component exceeds 12 parts by weight, the phenomenon of hardening the soil due to clay properties occurs. It is undesirable because it can cause oxygen supply failure to crop roots.

The starch contained in the sulfur aqueous dispersion and the illite aqueous dispersion binds to the mineral particles of the concentrated mineral water and prevents the aggregation of the mineral particles, thereby acting as a mineral dispersing agent, so that the occurrence of precipitation due to mineral aggregation can be suppressed.

The fertilizer prepared as described above contains a high concentration of mineral components, so it is diluted before use. It depends on the crop, but it is preferable to use it diluted with water of 500 to 3000 times. If the above dilution range is exceeded, the mineral fertilization effect If it does not appear or the influence of minerals is too strong, there is a risk of crop death.

As described above, the fertilizer of the present invention can maintain a uniform dispersion of each particle component without using a synthetic dispersant, so it can be stored and used for a long time as an organic fertilizer, and the particle size is fine, so the absorption rate of crops is high and fertilizer spraying The nozzle is not clogged, and it can be easily mixed with water and other ingredients and supplied to crops, and excellent fertilization effects can be obtained even when a small amount of fertilizer is used by promoting the growth of crops and solving excessive mineral obstacles.

Hereinafter, the present invention will be described in more detail based on the following Examples, Comparative Examples and Test Examples.

However, the following examples are only for exemplifying the present invention, and the present invention is not limited by the following examples, and can be substituted and replaced by other equivalent examples without departing from the technical spirit of the present invention. It will be clear to those skilled in the art to which the present invention belongs.

<Example 1>

Deep sea water collected at a depth of 200 m or less was filtered through a 150 mesh filter to obtain filtered water from which foreign substances were removed, and then the filter filtered water was put into a heating container and heated to 50 ° C. to precipitate salt.

The heated filter water was separated into salt and mineral stock solution in a centrifuge, and the separated mineral stock solution was filtered by passing through an activated carbon filtration device, and then heated and concentrated to prepare mineral concentrated water having a solid content of 35 Brix.

15 kg of sulfur, 1 kg of natural starch, and 84 kg of water were mixed and pulverized in a ball mill to prepare an aqueous sulfur dispersion having an average particle size of 20 μm, and 15 kg of illite, 1 kg of natural starch, and 84 kg of water were mixed. and pulverized in a ball mill to prepare an illite aqueous dispersion having an average particle size of 3 μm.

A fertilizer containing mineral components of seawater was prepared by mixing 50 kg of the sulfur aqueous dispersion and 90 kg of the illite aqueous dispersion with 1 ton of the mineral concentrated water.

<Example 2>

In Example 1, natural evaporation consisting of a water tank (2), a pump (3), a drying frame (4), a plurality of cloths (5), a transparent roof (not shown) and a blower (not shown) is used to filter filtered water. It was accommodated in the water tank 2 of the apparatus 10 (FIG. 1).

After operating the blower, the pump 3 was operated to transfer the filtered water 1 accommodated in the water tank 2 to the drying frame 4, and the filtered water was a plurality of water hanging downward in the drying frame 4. After being distributed to the fabric (5), it naturally flows down the fabric by its own weight and is brought back into the water tank (2), so that the moisture in the filter filtrate is evaporated and removed by sunlight and the wind of the blower while flowing down along the fabric (5). Thus, the fertilizer was prepared in the same manner as in Example 1, except that the salinity of the filtered water was increased to 15% and then put in a heating container and heated to precipitate salt.

<Example 3>

In Example 1, the pH was adjusted to 9 by adding sodium hydroxide to the extracted deep sea water, stirred at 70 rpm for 20 minutes, and then filtered through a filter. Fertilizer was prepared in the same manner as in Example 1 did

<Example 4>

In Example 1, the fertilizer was prepared in the same manner as in Example 1, except that octenyl succinate sodium starch adjusted to pH 4 was used instead of natural starch when preparing the illite aqueous dispersion.

<Example 5>

In Example 1, the same as in Example 1 except that sodium hydroxide was added to the prepared illite aqueous dispersion, starch was added together to adjust the pH, and then mixed with concentrated mineral water and sulfur aqueous dispersion. Fertilizer was prepared in this way.

<Comparative example>

In Example 1, the fertilizer was prepared in the same manner as in Example 1, except that sulfur or illite was mixed with only water and ground without using natural starch when preparing the aqueous dispersion of sulfur and illite.

<Test Example 1> Evaluation of dispersion stability

After the fertilizers prepared in Examples 1 to 5 and Comparative Example were allowed to stand for a certain period of time, the state of precipitate was visually observed, and the state of shaking and mixing the precipitate was visually observed and shown in Table 1 below.

Dispersion stability evaluation result after 1 month politics after 1 month politics
shaken up after 2 months politics after 2 months politics
shaken up Example 1 ☆ ☆ ◎ ☆ Example 2 ☆ ☆ ◎ ☆ Example 3 ☆ ☆ ☆ ☆ Example 4 ☆ ☆ ☆ ☆ Example 5 ☆ ☆ ☆ ☆ comparative example △ ◎ × △ ☆: There is little occurrence of sediment or suspended matter, and the dispersion state of the suspension is very uniform.
◎: A little precipitate or suspended matter occurs, and the dispersion state of the suspension is relatively uniform.
○: Precipitate or suspended matter occurs, and the dispersion state of the suspension is relatively uneven.
△: A lot of precipitate or suspended matter occurs, and the dispersion state of the suspension is not uniform.
×: A lot of precipitate or suspended matter occurs, and the dispersion state of the suspension is not very uniform.

Referring to Table 1, the fertilizers of Examples generate little or no precipitate even when stored for a long time, and even when precipitate occurs, they maintain a uniform dispersion state when shaken, so during dilution with water for use, It is assumed to be evenly distributed.

In particular, in Example 4, octenyl succinate sodium starch with high surface activity was used to uniformly disperse illite in water, and in Example 5, starch was added to the illite aqueous dispersion to maintain pH at slightly acidic It is considered that the overall dispersion stability is excellent by increasing the dispersion stability of illite.

On the other hand, in the case of the comparative example, after 2 months of standing, sulfur floats on the top and an illite sediment layer like mud was formed on the bottom, and a phenomenon was observed that was not uniformly dispersed in water even when shaken.

Therefore, it is believed that the use of starch when preparing an aqueous dispersion of sulfur and illite will allow sulfur and illite to be uniformly dispersed in liquid fertilizer to supply uniform fertilizer to crops.

<Test Example 2> Growth effect evaluation

Using commercially available 4th type compound fertilizer as a control, the fertilizers prepared in Examples and Comparative Examples were diluted with water in a weight ratio of 1000 to obtain cucumbers (Dadagioi), melons (Obok melons), radishes (Daebongmu), Cabbage (Jangsaeng No. 3) was applied by foliar and drench methods.

After spraying 100 kg of the diluted solution per 1 acre of soil in the greenhouse facility and mixing it well with the soil, the seedlings were planted, and after 20 days, foliar and drench fertilization was repeated three times at 5-day intervals.

Each variety was harvested on the same day at the harvest time, and the fruit weight was measured, and the results are shown in Table 2 below.

Growth effect evaluation result (g) cucumber melon radish napa cabbage Example 1 139 351 1175 3024 Example 2 141 347 1181 3052 Example 3 144 353 1178 3106 Example 4 148 355 1193 3145 Example 5 145 355 1187 3084 comparative example 133 334 1076 2914 control group 135 341 1082 2872

As shown in Table 2, in all varieties, the yield of the fertilizer of Example was higher than that of the comparative example and the control group, and among the examples, Example 4 exhibited the best effect, which is the surface activity when preparing the illite aqueous dispersion. It is judged to be the result of supplying fertilizer with uniform ingredients to crops because illite is uniformly dispersed in fertilizer using this highly modified starch.

Type 4 compound fertilizer (control group) is a fertilizer containing at least two components of nitrogen, phosphoric acid, and potassium and two or more trace elements such as magnesium, manganese, and iron. From the results, it can be seen that the uniform dispersion of mineral components in the fertilizer is more important to the growth of crops than the mineral content.

1: filtered water, 2: water tank, 3: pump, 4: drying frame, 5: cloth, 10: natural evaporation device

Claims (7)

sea water; Salt water mixed with water so that the sea salt content is 20 to 25% by weight; or a mixture thereof; adding sodium hydroxide to adjust the pH to 8-10 and stirring at 50-90 rpm for 10-30 minutes;
Filtering the stirred seawater, brine, or a mixture thereof with a 100 to 200 mesh filter to obtain filter filtrate from which foreign substances are removed;
Heating the filtered water to a temperature of 40 to 60 ° C. to precipitate salt, and then removing the precipitated salt;
Removing the cetylpyridinium chloride after immersing the activated carbon in an aqueous solution of cetylpyridinium chloride at a concentration of 5 to 15 mM for 10 to 15 hours,
Obtaining activated carbon filtrate by filtering the salt-removed filter filtrate with activated carbon from which cetylpyridinium chloride is removed;
Heating and concentrating the activated carbon filtered water to obtain mineral concentrated water having a solid content of 30 to 40 Brix;
Preparing a sulfur aqueous dispersion having an average particle size of 30 μm or less by mixing and pulverizing 10 to 20% by weight of sulfur, 0.1 to 2.0% by weight of natural starch and the rest of the water,
10 to 20% by weight of illite, 0.1 to 2.0% by weight of acetylated starch or octenyl succinate starch whose pH is adjusted to 4.5 or less, and the rest of the water are mixed and pulverized to obtain an illite having an average particle size of 3 μm or less Preparing an aqueous dispersion and
A method for producing a fertilizer comprising the step of mixing 2 to 7 parts by weight of sulfur aqueous dispersion and 5 to 12 parts by weight of illite aqueous dispersion in 100 parts by weight of the mineral concentrated water. delete The method of claim 1,
Between the step of obtaining the filter filtrate and the step of removing the salt, a step of removing moisture by introducing the filter filtrate into the natural evaporation device 10 is added,
The natural evaporation device 10 includes a water tank 2 for accommodating the filtered water 1, a pump 3 for transferring the filtered water 1 in the water tank 2 to a drying frame 4, and the water tank 2 A drying frame 4 installed on the upper part of the drying frame 4 and distributing the filter filtrate introduced from the pump 3 to the cloth 5, and the filter filtrate suspended from the drying frame 4 and distributed from the drying frame 4 to the lower part. A method for producing a fertilizer, characterized in that it comprises a plurality of cloths (5) that guide it to flow down into the tank (2) of the. delete delete The method of claim 1,
A method for producing a fertilizer, characterized in that the illite aqueous dispersion is adjusted to pH 5.0 to 6.5 and then mixed with mineral concentrated water and sulfur aqueous dispersion. delete

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