JP2017149626A - Production method of granular fertilizer composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method whereby a granular fertilizer composition having high particle hardness can be obtained, in which generation of dust is little in a production process because loss in particle size regulation is little during particle size regulation, and occurrence of solidification is also little because degradation of the granular fertilizer composition is little during custody of a fertilizer.SOLUTION: In a production method of a granular fertilizer composition for performing particle size regulation and classification, after obtaining a granulated material by granulating the fertilizer composition, after granulating the fertilizer composition, a particle hardness of the granulated material is raised to 3 kgf or more, and then particle size regulation is performed.SELECTED DRAWING: None

Description

  The present invention has a high yield of fertilizer after production by increasing the particle hardness of the granulated product in the production process of the granular fertilizer composition, and it is difficult to cause pulverization during storage of fertilizer and does not cause solidification The present invention relates to a method for producing a fertilizer composition.

  Fertilizers are handled in various shapes such as liquids, powders, granules, and pellets according to the speed at which the fertilizer effect is exerted on plants and soil and the application method. In general, granular fertilizers with large grain shapes have a slow effect, but not only can the rate of fertilizer effect be controlled by granulating the fertilizer, but they can also be mechanically fertilized on large farms. Have. In the use of fertilizer, not only the shape but also the nutrients that make up the fertilizer, especially fertilizers according to the plant that grows by changing the composition ratio of the three major nutrients, nitrogen, phosphorus, potassium, various fertilizer compositions Fertilized as a product. When manufacturing a granular fertilizer composition according to such a purpose, the fertilizer physical properties that are commonly required are the granular strength of the granular material so as not to generate dust and clogging of the mechanical flow path during mechanical fertilization. It is high and difficult to pulverize, and it has good fluidity so that caking does not occur during storage of the fertilizer, and the production of fertilizers that satisfy these requirements has been studied (Patent Documents 1 to 4). In Patent Document 1, granular fertilizer is granulated using briquetta and then granulated fertilizer is manufactured by sizing, but there are few burrs, high grain strength, high nitrogen concentration, low solidification, In order to produce granulated nitrogen fertilizer with physical properties suitable for fertilizers such as low generation of fertilizer, control the granulator pocket size, granulation pressure, burr thickness when compressing and granulating nitrogen fertilizer Yes. Moreover, the manufacturing method (patent document 2) of the granular porous fertilizer which has the immediate solubility and the immediate effect excellent in the soil surface by granulating a chemical fertilizer powder is proposed. On the other hand, in the production of granular fertilizer, when handling as fertilizer, the granulated ammonium sulfate is pulverized, and the granulated ammonium sulfate produced when stored for a long time is solidified. When it occurs, workability at the time of machine spraying is deteriorated. Therefore, a method for suppressing pulverization and consolidation in granulated ammonium sulfate production has been studied (Patent Document 3). In this technology, granular ammonium sulfate obtained by classification after granulation is mixed with raw material ammonium sulfate and put into a compactor to obtain a granular fertilizer that is compressed and hardened, and that does not easily collapse during storage and handling. As for fertilizer anti-caking, when granulating granular ammonium sulfate, add anti-caking material such as wax or surfactant to a part of the ammonium sulfate and mix the remaining ammonium sulfate to compress granulation. A method (Patent Document 4) has been proposed.

JP 2013-177287 A Japanese Patent Laid-Open No. 2006-169064 JP 2008-127238 A JP 2013-245147 A

  As described above, various granular fertilizer compositions and methods for producing the same have been proposed, and especially for those that perform granulation, granulation is performed after granulation, but the granule hardness is not necessarily high. In the sizing stage, there are many sizing losses, the yield is reduced, and dust is also generated. Furthermore, when pulverization occurs during storage of the fertilizer, it also causes caking through the generated fine powder.

  As a result of intensive investigations to solve the above-mentioned problems, the present invention, after granulating the fertilizer composition to obtain a granulated product, once increased the particle hardness of the granulated product to 3 kgf or more, and then sized As a result, the yield is high and the generation of powder due to physical friction during storage immediately after sizing, which causes caking, is reduced, the occurrence of caking during storage is reduced, and the generation of dust is also reduced. It has been found that fewer granular fertilizer compositions can be produced.

In order to achieve the above object, the present invention adopts the following configuration.
1. A method for producing a granular fertilizer composition comprising granulating a fertilizer composition to obtain a granulated product, then increasing the particle hardness of the granulated product to 3 kgf or more, and then sizing.
2. The method for producing a granular fertilizer composition according to 1, wherein the granulation step is a compression granulation method.
3. The method for producing a granular fertilizer composition according to 2, wherein the granulation step compresses by a briquette method using a pair of rollers.
4. The method for producing a granular fertilizer composition according to 2 or 3, wherein the granulation step is granulated at a granulation pressure of 0.6 kN / cm or more.
5. The method for producing a granular fertilizer composition according to any one of 1 to 4, wherein the increase in grain hardness of the granulated product is performed by any one of the following methods 1) to 3).
1) The granulated product is heated at 100 ° C. or higher and 150 ° C. or lower for 10 minutes or longer.
2) Store the granulated product at 10 ° C. or higher and 40 ° C. or lower for 6 hours or longer.
3) Store the granulated material for 1 day or more under a reduced pressure of 10 kPa or less.
6. The manufacturing method of the granular fertilizer composition of 1-5 in which a fertilizer composition contains at least 1 type chosen from a nitrogen fertilizer component, a phosphorus fertilizer component, a potassium fertilizer component, and combustion ash.
7. The method for producing a granular fertilizer composition according to 6, wherein the nitrogen fertilizer component contains at least one selected from ammonia sulfate, ammonium chloride, ammonia phosphate, ammonia nitrate, and urea.
8. The method for producing a granular fertilizer composition according to 6, wherein the phosphorus fertilizer component includes at least one selected from superphosphate lime, heavy superphosphate lime, and molten phosphorus fertilizer.
9. The method for producing a granular fertilizer composition according to 6, wherein the potassium fertilizer component contains at least one selected from potassium sulfate, potassium chloride, and potassium silicate.
10. A fertilizer composition containing the combustion ash comprises talc, polyethylene glycol, metal stearate, metal lauryl sulfate, kaolin, calcium carbonate, silicon oxide, calcium terephthalate, aluminum oxide, titanium oxide, calcium phosphate, and fluoride. The manufacturing method of the granular fertilizer composition in any one of 6-9 containing at least 1 type of granulation promoter chosen from lithium, and water.
11. The method for producing a granular fertilizer composition according to 10, wherein the granulation accelerator contains 1 to 10 parts by weight with respect to 100 parts by weight of combustion ash.
12. Water is a manufacturing method of the granular fertilizer composition of 10 or 11 containing 1-10 weight part with respect to 100 weight part of combustion ash.
13. The sizing is a method for producing a granular fertilizer composition according to any one of 1 to 12 using a spherical sizing machine.

  According to the production method of the present invention, by increasing the particle hardness of the granulated product after granulation, a granular fertilizer composition having a high yield at the time of sizing, a small amount of consolidation, and less dust generation is obtained. be able to.

<Fertilizer ingredients>
There is no restriction | limiting in particular in the fertilizer component used as a raw material by this invention, The nitrogen fertilizer component, phosphorus fertilizer component, and potassium fertilizer component which are the three major nutrients of a well-known plant can be used.

Specific examples of the nitrogen fertilizer component include ammonia sulfate, ammonium chloride, ammonia phosphate, ammonia nitrate, urea and the like. Among them, ammonia sulfate is, for example, an aqueous ammonium sulfate solution obtained by bringing coke oven waste gas into contact with sulfuric acid, or caprolactam aqueous solution after obtaining caprolactam and ammonium sulfate obtained by adding ammonia to caprolactam sulfate in the production of caprolactam. From the aqueous ammonium sulfate solution obtained by separating the aqueous ammonium sulfate solution from the aqueous solution of ammonium sulfate, it is used as fine-grained ammonium sulfate obtained by crystallizing ammonium sulfate by crystallization. The separation of the crystal and the mother liquor is performed by a known method. For example, it can be obtained by drying the crystals after separation from the liquid by centrifugation. Fine crystal ammonium sulfate has a crystal structure with a pressure of 10.1 kPa ABS or more because the crystal is rapidly agglomerated and the mother liquor is taken in if the supersaturation degree is too high at the time of crystallization. By performing the analysis, it is possible to obtain crystal-oriented fine crystal ammonium sulfate. The height of crystallinity can be measured by performing two-dimensional X-ray diffraction, and the degree of orientation obtained from the measurement result is preferably 0.995 or more. More preferably, the degree of orientation is 0.997 or more, and if the degree of orientation is 1.0, the crystallinity is the highest and the most preferable. Further, the ratio of containing fine crystal ammonium sulfate is preferably 60 wt% or more, more preferably 80% or more, and 100% is most preferable because only fine crystal ammonium sulfate having high crystallinity is obtained. The degree of orientation is an index indicating the degree of alignment of crystals. In two-dimensional X-ray diffraction, the following formula (1) is obtained from the half width (°) of the orientation peak obtained according to the tilt angle χ (°). ).
Degree of orientation = (180-half width of orientation peak) / 180 (1)

  In addition, the particle size of the fine crystal ammonium sulfate is preferably 1.7 mm or less because the smaller the particle size in which the crystals are aggregated and the mother liquor is not taken in, the better the consolidation is. More preferably, it is 1.4 mm or less, More preferably, it is 1.18 mm or less. The particle size of the fine crystal ammonium sulfate can be determined by classification with a sieve (aperture 10 mesh = 1.7 mm, 12 mesh = 1.4 mm, 14 mesh = 1.18 mm).

  Ammonia nitrogen in the fine crystal ammonium sulfate is preferably 20.5% or more, more preferably 21.0% or more from the viewpoint of fertilizer effect as a nitrogen source per unit weight.

  The moisture content of the nitrogen fertilizer component is preferably 5% or less. More preferably, it is 4% or less, More preferably, it is 3% or less. The moisture content when the nitrogen fertilizer component is fine-grained ammonium sulfate is preferably 0.3% or less. More preferably, it is 0.2% or less, more preferably 0.1% or less, and most preferably 0% when moisture is completely dried. The moisture content of the nitrogen fertilizer component is a value measured by the heat loss method according to the official fertilizer analysis method.

  Specific examples of the phosphorus fertilizer component include superphosphate lime, heavy superphosphate lime, and molten phosphorus fertilizer. Among them, lime superphosphate is produced by allowing sulfuric acid to act on the phosphate ore pulverized into a powder form, and the product preferably contains 15% or more, more preferably 17% or more of soluble phosphoric acid. The particle size of the phosphorus fertilizer component is preferably 5 mm or less. More preferably, it is 3 mm or less, More preferably, it is 1 mm or less. The moisture content of the phosphorus fertilizer component is preferably 5% or less. More preferably, it is 4% or less, More preferably, it is 3% or less. In addition, the moisture content of a phosphorus fertilizer component is the value measured by the heat loss method according to the official fertilizer analysis method.

  Specific examples of the potassium fertilizer component include potassium sulfate, potassium chloride, potassium silicate and the like. Of these, potassium sulfate preferably contains 45% or more and 55% or less of water-soluble potassium, and more preferably contains 48% or more and 52% or less. Potassium chloride preferably contains 55% to 65% water-soluble potassium, more preferably 58% to 62%. The particle size of the potassium fertilizer component is preferably 5 mm or less. More preferably, it is 3 mm or less, More preferably, it is 1 mm or less. The moisture content of the potassium fertilizer component is preferably 5% or less. More preferably, it is 4% or less, More preferably, it is 3% or less. In addition, the moisture content of a potassium fertilizer component is the value measured by the heat loss method according to the official fertilizer analysis method.

  Burning ash is ash obtained by incineration of feces from poultry such as chickens, ducks and duck, and livestock such as pigs, cows, horses, goats, sheep, dogs and cats. Among these, chicken manure ash which is approved as a raw material for chemical fertilizer under the Fertilizer Control Law and contains phosphorus, potassium, calcium, etc., which are active ingredients as fertilizer, is preferable. Since combustion ash is usually pH 11 or more and pH 13 or less, it may be neutralized by adding any of mineral acids such as phosphoric acid, sulfuric acid, nitric acid, and hydrochloric acid. Among these, combustion ash contains phosphoric acid, but there are cases where most of it is soluble and no fertilization effect is exhibited, so when neutralized with phosphoric acid, the fertilization effect is improved by the inclusion of soluble phosphoric acid Therefore, it is preferable to use phosphoric acid.

<Fertilizer composition>
The fertilizer composition, which is a raw material for producing granular fertilizer, may be used in a granulator by mixing one or more components selected from nitrogen fertilizer components, phosphorus fertilizer components, potassium fertilizer components and combustion ash. it can. The content of each component can be freely set according to the purpose, but the higher the component values of nitrogen fertilizer component, phosphorus fertilizer component, potassium fertilizer component, and combustion ash, the application amount can be reduced. , Can reduce the burden of fertilization work. It should be noted that the component values in the present invention, it is respectively N terms, P ₂ O ₅ in terms, that the weight percent relative to the weight of the fertilizer composition of each component in the case of K 2 _O conversion.

  The fertilizer composition consists of talc, polyethylene glycol, metal stearate, metal lauryl sulfate, kaolin, calcium carbonate, silicon oxide, calcium terephthalate, aluminum oxide, titanium oxide, calcium phosphate, and lithium fluoride as granulation accelerators. It may contain at least one selected. By adjusting the addition amount of these substances, the grain hardness of the granular fertilizer composition described later can be controlled, and an improvement in yield can be achieved. Furthermore, since it has the effect of a lubricant, especially when it contains combustion ash, it can also be expected to prevent the powder in the granulator from sticking to the granulator due to the viscosity due to containing moisture. .

  The addition amount of the granulation accelerator is preferably 1 to 5 parts by weight with respect to 100 parts by weight of the fertilizer composition, in order to obtain a fertilizer with grain hardness that has no loss due to adhesion to the apparatus and has good solubility as a fertilizer. Is more preferably 1.5 to 4.5 parts by weight per 100 parts by weight of the fertilizer composition. In order to reduce the adhesion loss to the apparatus, 2.5 to 3.5 parts by weight is more preferable with respect to 100 parts by weight of the fertilizer composition.

<Granulated material>
In the present invention, the granulated product is obtained by supplying a fertilizer composition to a granulator and granulating it. The granule hardness is preferably 0.5 kgf or more immediately after granulation. When the grain hardness is less than 0.5 kgf, it takes a long time to increase the grain hardness, and the productivity is deteriorated. The granule grain hardness after the grain hardness increase is preferably 3 kgf or more. When the particle hardness is less than 3 kgf, the granulated product is easily pulverized during sizing, and the yield during sizing decreases. On the other hand, when the grain hardness exceeds 5 kgf, the solubility of the fertilizer composition in the soil is poor and the fertilization effect is reduced. Further, during storage of the granulated material, pulverization is likely to occur due to friction between the granulated materials, which causes caking of the granulated materials. More preferably, they are 3 kgf or more and 5 kgf or less, More preferably, they are 3.5 or more and 4.5 kgf or less. The grain hardness of the granulated product is determined by measuring the grain hardness of 20 granulated products with a Kiyama-type hardness meter and taking the average value of these grain hardnesses.

  The moisture content of the granulated product after the increase in grain hardness is preferably 5% or less from the viewpoint of preventing consolidation of the granulated products in the course of increasing the grain hardness. More preferably, it is 3% or less, more preferably 1% or less, and 0% with completely dried moisture is most preferable because the possibility of solidification is the lowest. The moisture content of the granulated product after the increase in grain hardness is a value measured by the heat loss method according to the official fertilizer analysis method.

<Granular fertilizer composition>
In the present invention, the granular fertilizer composition is prepared by supplying a granulated product of the fertilizer composition to a granulator. The granular fertilizer composition is a granular product produced from a fertilizer composition obtained by mixing one or more components selected from a nitrogen fertilizer component, a phosphorus fertilizer component, a potassium fertilizer component, and combustion ash at the raw material stage, or the granular product. Any of bulk blend fertilizers obtained by dry blending two or more kinds may be used. Since this mixed fertilizer can be blended at an arbitrary ratio, blending corresponding to each crop can be performed.

  In the present invention, the granular fertilizer composition includes talc, polyethylene glycol, metal stearate, metal lauryl sulfate, kaolin, calcium carbonate, silicon oxide, calcium terephthalate, aluminum oxide, titanium oxide, calcium phosphate as a granulation accelerator. And at least one selected from lithium fluoride. These substances can achieve an improvement in yield by controlling the grain hardness of the granular fertilizer composition by adjusting the addition amount. Furthermore, since it has the effect of a lubricant, it can be expected to prevent adhesion of powder in the apparatus and adhesion to the apparatus due to viscosity due to moisture, especially when it contains combustion ash.

  The addition amount of the granulation accelerator is preferably 1 to 5 parts by weight with respect to 100 parts by weight of the fertilizer composition, in order to obtain a fertilizer with grain hardness that has no loss due to adhesion to the apparatus and has good solubility as a fertilizer. Is more preferably 1.5 to 4.5 parts by weight per 100 parts by weight of the fertilizer composition. In order to reduce the adhesion loss to the apparatus, 2.5 to 3.5 parts by weight is more preferable with respect to 100 parts by weight of the fertilizer composition. Moreover, the said granulation acceleration | stimulation material may be contained in the fertilizer composition which is a raw material, and may be coat | covered by the surface of the fertilizer composition processed into the granule.

The yield of granular fertilizer composition should be 60% or more in order to reduce the amount of fertilizer composition discarded during granulation and granulation as much as possible, or to recycle to the granulation process without discarding. preferable. More preferably, it is 65% or more, further preferably 70% or more, and 100% is most preferable when it can be completely recovered. In addition, a yield is a weight ratio of the granular fertilizer composition obtained by granulating and sizing with respect to the weight of the fertilizer composition thrown into a granulator, and is shown by following formula (2).
Yield = (Weight of granular fertilizer composition) / (Raw material weight of fertilizer composition to be charged into granulator)
× 100 (%) (2)

  The particle size of the granular fertilizer composition is preferably 2 mm or more and 4 mm or less in order to ensure the reach of the fertilizer in mechanical fertilization. More preferably, it is 2.5 mm or more and 3.5 mm or less.

  The moisture content of the granular fertilizer composition is preferably 3% or less from the viewpoint of preventing the solidification of the granular fertilizer compositions during long-term storage. More preferably, it is 2% or less, more preferably 1% or less, and 0% with completely dried moisture is most preferable because the possibility of solidification is the lowest. In addition, the moisture content of a granular fertilizer composition is the value measured by the heat loss method according to the official fertilizer analysis method.

  The shape of the granular fertilizer composition is preferably round so as not to adhere to the leaves of crops and fall to the soil when subjected to mechanical fertilization. It is not preferable that the pressure fertilizer has a round shape, for example, a flat shape, because it adheres to the leaf and does not fall, resulting in poor nutrient supply. The particle size of the granular fertilizer composition is measured by sieving.

  The grain hardness of the granular fertilizer composition is preferably 2 kgf or more and 5 kgf or less. When the grain hardness is less than 2 kgf, pulverization is likely to occur during storage of the granular fertilizer composition, which causes solidification of the granular materials via the powder. On the other hand, when the grain hardness exceeds 5 kgf, the solubility of the granular fertilizer composition in the soil is poor and the fertilization effect is reduced. More preferably, they are 3 kgf or more and 5 kgf or less, More preferably, they are 3.5 kgf or more and 4.5 kgf or less. In addition, the particle hardness of a granular fertilizer composition measures the particle hardness of 20 granular fertilizer compositions with a Kiyama-type hardness meter, and makes the average value of these particle hardness the particle hardness.

The consolidation strength of the granular fertilizer composition is preferably 1 kg / cm ² or less. When it is 1 kg / cm ² or more, for example, the consolidated portion is difficult to flow out of the flexible container, so that it is not easy to put into the hopper, or the granular fertilizer composition cannot be uniformly sprayed to the plants grown in mechanical fertilization. Inferior to sex. More preferably consolidation strength is 0.5 kg / cm ² or less, more preferably 0.2 kg / cm ² or less. The consolidation strength is a value measured by pressing the needle portion perpendicularly to the upper surface of the fertilizer using a Yamanaka type soil hardness meter.

In order to facilitate handling of the granular fertilizer composition, the consolidation rate is preferably 20% or less. If the consolidation rate exceeds 20%, the fluidity is deteriorated as described above, and mechanical fertilization becomes difficult. More preferably, it is 15% or less, more preferably 10% or less, and most preferably 0% which does not cause any solidification. In addition, a consolidation rate is a ratio of a solidification part weight among the granular fertilizer compositions after a one-month load with a weight of 60 kg with respect to 750 g of granular fertilizer compositions, and is shown by following formula (3).
Consolidation rate = (weight of consolidated part after one month load) / 750 × 100 (3)

In order to prevent caking during storage of the granular fertilizer composition, the powdering rate is preferably 1.0% or less. When the pulverization rate exceeds 1.0%, it is easy to consolidate during storage through the pulverized powder, and further, the granular fertilizer composition cannot be sprinkled up to the plant grown in mechanical fertilization, so that the handling property is inferior. . More preferably, it is 0.5% or less, further preferably 0.3% or less, and most preferably 0% without any powdering. In addition, a powdering rate is a ratio of the particle diameter obtained by using a sieve with a mesh opening of 2 mm among granular fertilizer compositions after a one-month load with a weight of 60 kg with respect to 750 g of the granular fertilizer composition. Yes, it is shown by the following formula (4).
Powdering rate = (weight of particle size of 2 mm or less) / 750 × 100 (4)

  In the case where the granular fertilizer is granular nitrogen fertilizer made of ammonium sulfate, the ammoniacal nitrogen is preferably 20.5% or more, more preferably 21.0% or more from the viewpoint of fertilizer effect as a nitrogen source per unit weight.

<Method for producing granular fertilizer composition>
The granulation method of the granular fertilizer composition is preferably compression granulation, and the compression granulation apparatus may use any of a tablet method, a plate-like method, and a briquette method. Since it is difficult to mass-produce products, and it is difficult to produce a granulated fertilizer having a spherical shape and few burrs by a plate-like method, it is preferable to use a briquette method. As a briquette type compression granulator, for example, a Briquetta (registered trademark) BSS type (manufactured by Shinto Kogyo) or the like can be preferably used.

  The method of supplying the raw material fertilizer composition to the compression granulator is not particularly limited. For example, the fertilizer composition is stored in a hopper, and directly supplied to the granulator from the conveyor attached to the hopper, or the hopper conveyor Can be supplied to the granulating apparatus via a belt conveyor or a bucket conveyor.

  The granulation pressure indicates the value (linear pressure) obtained by dividing the total load applied to the raw material fertilizer composition by the effective width, and the effective width is the compressor side in the portion where the load is applied to the raw material fertilizer composition. Indicates the major axis. For example, in the case of a tablet system, the effective width is the long diameter of the tablet part, and in the case of a briquette system using a roller, the effective width is the length of the part where the raw material fertilizer composition is compressed by the roller. The granulation pressure is preferably 0.6 kN / cm or more and 30.0 kN / cm or less, more preferably 3.0 kN / cm or more and 20.0 kN / cm or less, and further preferably 5.0 kN / cm. The above is 15.0 kN / cm or less. When the granulation pressure is lower than 0.6 kN / cm, granulation of the fertilizer composition itself does not occur due to insufficient pressure. When the granulation pressure is higher than 30.0 kN / cm, the granular hardness of the granulated product increases, so the solubility of the fertilizer components in the soil decreases and the fertilizer effect on the soil decreases, or the granular fertilizer composition When the product is bulk blended, other granular fertilizer compositions may be pulverized by friction. Moreover, since a load more than necessary is applied to the bulk blend compression granulator, the life of the apparatus is significantly reduced.

  The burr thickness of the compression granulator indicates the minor axis of the raw material fertilizer composition at a portion where a load is applied to the raw material fertilizer composition. For example, in the case of a tablet system, the burr thickness is the short diameter of the tablet part, and in the case of a briquette system using a roller, the burr thickness is the length of the shortest distance between the rolls (clearance). The burr thickness is preferably in the range of 1.0 mm to 2.5 mm, and more preferably in the range of 1.2 mm to 2.0 mm. When the burr thickness is smaller than 1.0 mm, both the grain strength and yield of the granular fertilizer composition tend to decrease. When the burr thickness exceeds 2.5 mm, the shape of the granular fertilizer composition becomes unsuitable for fertilizer application, and the granulated granular fertilizer composition is crushed with, for example, a vibrating sieve using a pulverizing ball. When the particle diameter is made uniform, clogging of the sieve is caused, which is not preferable.

  The raw material fertilizer composition that can be processed by the granulator per unit time and unit length (hereinafter referred to as granulation efficiency) is the amount of raw material fertilizer composition supplied to the granulator supplied per hour It shows the granulation ability per unit time and unit length, converted and further divided by the effective width.

  The granulated product granulated by the compression granulator can be crushed, sized and classified to obtain a granular fertilizer composition having a preferable shape as a fertilizer.

  In order to obtain a granular fertilizer composition having a uniform particle size, it is preferable to crush the fertilizer composition after compression granulation using a crusher. There are no particular limitations on the type of crusher, and various crushers such as a jaw crusher and a roll crusher, various mills such as a roller mill and a cutting mill, and a vibration sieve to which crushing media are added are preferably used. It is also possible to use a combination of these crushers.

  The granulated fertilizer composition is required to increase the grain hardness to 3 kgf or more in order to prevent pulverization by sizing and decrease in yield. There are the following three methods for increasing the grain hardness of the granulated fertilizer composition. (1) The granulated product is heated at 100 ° C. or higher and 150 ° C. or lower for 5 minutes or longer. (2) Store the granulated product at 10 ° C. or higher and 40 ° C. or lower for 6 hours or longer. (3) The granulated product is stored for 20 hours or more under a reduced pressure of 10 kPa or less. Note that these three methods may be combined. In either case, it may be in air or in a nitrogen atmosphere.

  When the granulated product is heated at 100 ° C. or more and 150 ° C. or less, it may be heated using a heater, and the type of the heater is not particularly limited. Hot air such as a rotary dryer or fluidized bed dryer Conductive heat transfer dryers such as heat-receiving dryers, agitation dryers, infrared heating dryers, crystallization dryers, and constant temperature and humidity dryers are used. A rotary dryer is preferably used because it can be raised and continuous processing is possible. The heating temperature is preferably from 100 to 150 ° C., more preferably from 110 to 140 ° C. When the heating temperature is less than 100 ° C., the grain hardness does not reach 3 kgf or more, resulting in pulverization and productivity deterioration inside the apparatus, and when the heating temperature is higher than 150 ° C., Causes moisture absorption after heating. The heating time is preferably 5 minutes or more and 60 minutes or less, and more preferably 10 or more and 30 minutes or less. When the heating time is shorter than 5 minutes, the heating effect is low, so the grain hardness does not reach 3 kgf or more, and when the heating time is longer than 60 minutes, the capacity of the heater increases in the continuous production of fertilizer, Is not preferable because it requires enormous energy.

  Moreover, when storing at 10 degreeC or more and 40 degrees C or less for 6 hours or more, there is no restriction | limiting in a storage method, You may accumulate in a warehouse and may be in containers, such as a container. The storage temperature is preferably 10 ° C. or higher and 40 ° C. or lower, more preferably 25 ° C. or higher and 30 ° C. or lower. If the storage temperature is less than 10 ° C., it takes time to increase the grain hardness and may not reach 3 kgf or more. In addition, powdering and productivity during storage deteriorate. On the other hand, when the storage temperature is higher than 40 ° C., a cooling step is necessary before the granulation step, and moisture is easily absorbed due to the high temperature. The storage time is preferably 6 hours to 24 hours, more preferably 10 hours to 20 hours. When the storage time is shorter than 6 hours, the grain hardness does not reach 3 kgf or more, and when the storage time is longer than 24 hours, the productivity is deteriorated or the granulated product is likely to absorb moisture after storage. The storage humidity is preferably low, and the humidity is preferably 60% RH or less.

  Moreover, when storing at 10 kPa or less, there is no restriction | limiting in a vacuum storage environment, You may store using a tank, a silo, and a vacuum dryer. Moreover, you may stir. The storage pressure is preferably 10 kPa or less, more preferably 5 kPa or less, and most preferably 0 kPa. When the storage pressure is higher than 10 kPa, it takes time to increase the grain hardness and the productivity is deteriorated. The storage time is preferably 20 hours or more and 48 hours or less, more preferably 22 hours or more and 26 hours or less. When the storage time is shorter than 20 hours, the drying effect is low, so the grain hardness does not reach 3 kgf or more, and when the storage time is longer than 48 hours, the productivity deteriorates. The storage temperature is preferably 0 ° C. or higher and 150 ° C. or lower, more preferably 10 ° C. or higher and 100 ° C. or lower, and most preferably 25 ° C. or higher and 50 ° C. or lower. When the storage temperature is less than 0 ° C., moisture in the granulated product is frozen, and when the storage temperature is higher than 150 ° C., the granulated product is discolored.

  By the grain hardness increasing operation carried out by one or a combination of these (1) to (3), the grain hardness becomes 3 kgf or more.

  In order to obtain a granular fertilizer composition having a spherical shape and less burrs, it is preferable to use a granulator to regulate the size. There is no particular limitation on the type of the granulator, and for example, a high-speed rolling method, an oscillator type, a crushing method, a centrifugal rotating method, and the like are preferably used. Malmerizer (registered trademark: a registered trademark: More preferably, the granular fertilizer composition is sized using Dalton).

  The treatment time of the granulator is preferably in the range of 0.2 minutes to 5.0 minutes, and more preferably in the range of 0.3 minutes to 3.0 minutes. When the processing time of the granulator becomes shorter than 0.2 minutes, the burr removal of the granular fertilizer composition becomes insufficient. When the processing time of the granulator becomes higher than 5.0 minutes, the amount of parts other than burrs that are cut increases and the yield of the granular fertilizer composition decreases. Furthermore, since the time required for the sizing treatment increases, the yield of the granular fertilizer composition per unit time also decreases.

  The rotational speed of the granulator is preferably in the range of 50 revolutions / minute to 2000 revolutions / minute, and more preferably in the range of 100 revolutions / minute to 1500 revolutions / minute. When the rotational speed of the granulator becomes lower than 50 revolutions / minute, the burr removal of the granular fertilizer composition becomes insufficient, and the time required for the granulation treatment increases, so the granular fertilizer composition yield per unit time is also increased. descend. When the rotational speed of the granulator becomes higher than 2000 revolutions / minute, problems such as an increase in noise and a decrease in equipment life occur.

  In order to obtain a granular fertilizer composition having a predetermined particle size or more, it is desirable to classify the granular fertilizer composition using a classifier. The type of classifier is not particularly limited as long as dry classification is possible, but it is preferable to use a vibration sieve. The opening of the sieve is not particularly limited as long as a predetermined particle size can be obtained, but is preferably 1.8 to 2.2 mm, and 3.8 to 4.2 mm. A classification method for obtaining a granular fertilizer composition having a particle size of 2.0 mm or more and 4.0 mm or less by combining these sieves having openings is preferable.

  In order to obtain a granular fertilizer composition with few burrs, strong grain strength, less dust generation, and hard to solidify, granulate the fertilizer composition as a raw material using a compression granulator and use a crusher After pulverizing the granulated product after compression granulation and increasing the particle hardness of the granulated product using a rotary dryer, the granulated product is sized using a spherical granulator and classified. It is preferable to classify the sized granular fertilizer composition using There are no restrictions on the method of transporting the granular fertilizer composition in each step, but it is possible to use natural fall, conveyor transport, air feeding, etc., and after transporting the fertilizer composition as a raw material to the granulator by conveyor transport The method of transporting to a crusher, rotary heater, spherical granulator, and classifier by natural fall is preferable. For the contact parts of equipment including these transportation equipment, it is preferable to use a material having corrosion resistance, and it is preferable to use SUS316L or resin.

  The fertilizer composition as a raw material is granulated using a compression granulator, the fertilizer composition after compression granulation is pulverized using a pulverizer, and the granular hardness of the granulated product is measured using a rotary heater. The fine powder under the sieve obtained when the granulated fertilizer composition after sizing using a spherical sizing machine is sized using a spherical sizing machine, It can be recycled and mixed into the raw material fertilizer composition and used as a raw material.

  After granulation and sizing to produce a granular material, the granular fertilizer composition is talc, polyethylene glycol, metal stearate, metal lauryl sulfate, kaolin, calcium carbonate, silicon oxide, terephthalic acid as anti-caking agent A granular fertilizer composition can be obtained by coating the surface of the granular fertilizer composition with at least one selected from calcium, aluminum oxide, titanium oxide, calcium phosphate, and lithium fluoride. As a method of coating, if the fertilizer composition is granulated and sized, and then uniformly classified after classification with a classifier, it may be added at the outlet of the classifier or mixed and coated using a mixer. Alternatively, it may be coated by spraying on a belt conveyor.

  The amount of anti-caking material added to the granular fertilizer composition is preferably 0.05 to 0.5 parts by weight with respect to 100 parts by weight of the granular fertilizer composition, loss due to adhesion to the device, and fertilizer components per unit weight In order to obtain a fertilizer having a grain hardness that does not affect the content and has good solubility as a fertilizer, 0.1 to 0.3 parts by weight is more preferable with respect to 100 parts by weight of the granular fertilizer composition. In order to reduce the adhesion loss to the apparatus, 0.15 to 0.25 parts by weight is more preferable with respect to 100 parts by weight of the granular fertilizer composition.

  After granulating and sizing to produce a granular material, the granular fertilizer composition can be dried to reduce moisture. There are no particular restrictions on the type of dryer, and hot-air heat-receiving dryers such as rotary dryers and fluidized bed dryers, and heat transfer type dryers such as stirring dryers and infrared heating dryers are used. Since the introduction cost is low and continuous processing is possible, a rotary dryer is preferably used. The drying temperature is preferably 60 ° C. or higher and 150 ° C. or lower, and more preferably 100 ° C. or higher and 130 ° C. or lower. When the drying temperature is lower than 60 ° C., moisture reduction due to drying is insufficient, and a drying time is required for a long time, resulting in pulverization and productivity deterioration inside the apparatus, and when the drying temperature is higher than 150 ° C., Degradation of the granular fertilizer composition causes a decrease in fertilizer component concentration. The drying time is preferably 5 minutes or more and 60 minutes or less, and more preferably 10 minutes or more and 30 minutes or less. When the drying time is shorter than 5 minutes, the drying effect is low, moisture reduction is insufficient, and when the drying time is higher than 60 minutes, pulverization occurs inside the apparatus due to long-time heating, resulting in lower productivity. .

<Use of granular fertilizer composition>
The granular fertilizer composition obtained by the production method of the present invention has a feature that the particle size is as large as 2 mm or more, the particle hardness is as high as 3 kgf or more, and pulverization is less likely to cause caking and high fluidity. It can be used not only for manual fertilization on small farms but also for spraying machines on large farms. In addition, the granular fertilizer composition is a fertilizer composition in which the combination and content of one or more components selected from nitrogen fertilizer components, phosphorus fertilizer components, potassium fertilizer components and combustion ash are adjusted according to applications and purposes. Can be used as a raw material, and further, a bulk blend fertilizer obtained by dry blending two or more of the granular fertilizer compositions at an arbitrary ratio can be used for growing rice, vegetables, fruits and the like.

  Examples of the present invention are shown below, but the present invention is not limited to the following examples. Here, the number of parts in the examples indicates parts by weight. Measuring methods for physical properties and the like are as follows.

(1) Grain hardness The grain hardness of the granulated product is obtained by measuring the grain hardness of 20 granulated products with a Kiya-type hardness meter and calculating the average of these grain hardnesses.

(2) Yield The yield of the granular fertilizer composition is the weight of the granular fertilizer composition obtained by granulation and sizing with respect to the weight of the fertilizer composition put into the granulator, and calculated by the following formula: did.
Yield (%) = (weight of granular fertilizer composition) / (weight of fertilizer composition put into granulator)
× 100

(3) Particle size As for the particle size of the granular fertilizer composition, the ratio of the particle size of 2 mm or more and 4 mm or less was calculated by the following formula using a sieve having openings of 2 mm and 4 mm.
2 mm or more and 4 mm or less particle diameter (%) = (weight of particle diameter of 2 mm or more and 4 mm or less)
/ (Weight of granular fertilizer composition before sieving) × 100

(4) Moisture content The moisture content of the granular fertilizer composition is a value obtained by weight loss after drying the granular fertilizer composition before drying at 130 ° C. for 3 hours, and was calculated by the following formula. .
Moisture content (%) = ((weight of granular fertilizer composition before drying) − (weight of granular fertilizer composition after drying))
/ (Weight of granular fertilizer composition before drying) × 100

(5) Consolidation rate The solidification rate of the granular fertilizer composition is the ratio of the solidified part weight of the granular fertilizer composition after being loaded with a weight of 60 kg for one month with respect to 750 g of the granular fertilizer composition. Calculated by the formula.
Consolidation rate (%) = (Consolidated part weight after one month load) / 750 × 100

(6) Consolidation strength The solidification strength of the granular fertilizer composition is a value measured by pressing the needle portion perpendicularly to the upper surface of the fertilizer using a Yamanaka soil hardness tester.

(7) Powdering rate The powdering rate of the granular fertilizer composition is determined by using a sieve with an opening of 2 mm among the granular fertilizer composition after being loaded with a weight of 60 kg for one month with respect to 750 g of the granular fertilizer composition. The obtained particle size is the ratio of 2 mm or less, and was calculated by the following formula.
Powdering rate (%) = (weight of particle size of 2 mm or less) / 750 × 100

Example 1
100 parts by weight of fine crystal ammonium sulfate having an orientation degree of 0.997 and an average particle size of 1.4 mm was used as a raw material. The raw material is supplied to Briquetta (registered trademark) BSS-IH type (manufactured by Shinto Kogyo Co., Ltd.) as a granulator, effective roll width is 150 mm, granulation pressure is 8.3 kN / cm, burr thickness is 1.70 mm, pocket After granulating at a size of 3.3 mm and a roller rotation speed of 85 rpm, and crushing with a crusher, a three-stage crushing sieve machine having a sieve with openings of 6.7 mm, 5.2 mm, and 2.2 mm (Kowa Industry Co., Ltd.) And then crushed with a crushing medium (200 nylon hard ball balls, 200 lower balls), and the sieved product was collected. The granule hardness immediately after granulation was 0.7 kgf. The granulated product was supplied to a rotary kiln (manufactured by Kurimoto Iron Works) and heated by heating at a heating temperature of 130 ° C. and a rotation speed of 40 rpm for 20 minutes. The granule hardness after heating was 4.4 kgf. Subsequently, the granulated product was put into a marumerizer (Dalton), and the crushed product on a sieve was put in, and after sizing for 15 seconds at a rotation speed of 225 rpm, a circular vibrating sieve having a sieve with an aperture of 2 mm (Dalton) ) And classified, and the sieved product having an opening of 2 mm was recovered as a granular fertilizer composition. The yield of the granular fertilizer composition was 77%, the ratio of the particle diameters of 2 mm or more and 4 mm or less was 95.2%, and the particle hardness was 4.4 kgf. The moisture content of the granular fertilizer composition was 0.1%, the consolidation rate after 1 month of the consolidation test was 0%, the consolidation strength was 0 kg / cm ² , and the powdering rate was 0.02%.

(Example 2)
The fertilizer composition was granulated and pulverized in the same manner as in Example 1 except that the fertilizer component was 100 parts by weight of superphosphate lime (Taki fertilizer). The granule hardness of the granulated product immediately after granulation was 0.6 kgf. Thereafter, the granulated product was supplied to a rotary kiln (manufactured by Kurimoto Iron Works) and heated by heating at a heating temperature of 130 ° C. and a rotation speed of 40 rpm for 20 minutes. The granule hardness after heating was 4.3 kgf. Subsequently, the granulated product was sized and classified in the same manner as in Example 1 to recover the granular fertilizer composition. The yield of the granular fertilizer composition was 75%, the ratio of the particle size of 2 mm or more and 4 mm or less was 94.6%, and the particle hardness was 4.3 kgf. The moisture content of the granular fertilizer composition was 0.1%, the consolidation rate after 1 month of the consolidation test was 0%, the consolidation strength was 0 kg / cm ² , and the powdering rate was 0.07%.

(Example 3)
The fertilizer composition was granulated and crushed in the same manner as in Example 1 except that the fertilizer component was 100 parts by weight of potassium sulfate (Wako Pure Chemical Industries). The granule hardness immediately after granulation was 0.8 kgf. Thereafter, the granulated product was supplied to a rotary kiln (manufactured by Kurimoto Iron Works) and heated by heating at a heating temperature of 130 ° C. and a rotation speed of 40 rpm for 20 minutes. The granule hardness after the heating was 4.2 kgf. Subsequently, the granulated product was sized and classified in the same manner as in Example 1 to recover the granular fertilizer composition. The yield of the granular fertilizer composition was 79%, the ratio of the particle size of 2 mm or more and 4 mm or less was 95.6%, and the particle hardness was 4.2 kgf. The moisture content of the granular fertilizer composition was 0.1%, the consolidation rate after 1 month of the consolidation test was 0%, the consolidation strength was 0 kg / cm ² , and the powdering rate was 0.05%.

Example 4
A fertilizer composition was prepared in the same manner as in Example 1 except that 100 parts by weight of combustion ash obtained by burning chicken dung as a fertilizer component, and 3 parts by weight of talc (Asada Flour Milling SW-A) and 3 parts by weight of water were added. The grains were crushed. The granule hardness immediately after granulation was 0.1 kgf. Thereafter, the granulated product was supplied to a rotary kiln (manufactured by Kurimoto Iron Works) and heated by heating at a heating temperature of 130 ° C. and a rotation speed of 40 rpm for 20 minutes. The granule hardness after heating was 3.1 kgf. Subsequently, the granulated product was sized and classified in the same manner as in Example 1 to recover the granular fertilizer composition. The yield of the granular fertilizer composition was 65%, the ratio of the particle diameters of 2 mm or more and 4 mm or less was 93.2%, and the particle hardness was 3.1 kgf. The moisture content of the granular fertilizer composition was 0.1%, the consolidation rate after one month of the consolidation test was 0%, the consolidation strength was 0 kg / cm ² , and the powdering rate was 0.10%.

(Example 5)
A fertilizer component is 50 parts by weight of fine crystalline ammonium sulfate having an orientation degree of 0.997 and an average particle size of 1.4 mm, 50 parts by weight of combustion ash obtained by burning chicken dung, and 3 parts by weight of talc (Asada Flour SW-A) The fertilizer composition was granulated and pulverized in the same manner as in Example 1 except that 3 parts by weight of water was added. The granule hardness immediately after granulation was 0.5 kgf. Thereafter, the granulated product was supplied to a rotary kiln (manufactured by Kurimoto Iron Works) and heated by heating at a heating temperature of 130 ° C. and a rotation speed of 40 rpm for 20 minutes. The granule hardness after heating was 3.6 kgf. Subsequently, the granulated product was sized and classified in the same manner as in Example 1 to recover the granular fertilizer composition. The yield of the granular fertilizer composition was 72%, the ratio of the particle size of 2 mm to 4 mm was 92.8%, and the particle hardness was 3.6 kgf. The moisture content of the granular fertilizer composition was 0.1%, the consolidation rate after one month of the consolidation test was 0%, the consolidation strength was 0 kg / cm ² , and the powdering rate was 0.09%.

(Example 6)
The fertilizer composition was granulated and pulverized in the same manner as in Example 5. The granule hardness of the granulated product immediately after granulation was 0.6 kgf. The granulated material was deposited in a warehouse and stored at a temperature of 27 ° C. for 12 hours. The granule hardness after storage was 3.2 kgf. Subsequently, the granulated product was sized and classified in the same manner as in Example 1 to recover the granular fertilizer composition. The yield of the granular fertilizer composition was 69%, the ratio of the particle diameters of 2 mm or more and 4 mm or less was 91.4%, and the particle hardness was 3.2 kgf. The moisture content of the granular fertilizer composition is 1.0%, the consolidation rate after one month of the consolidation test is 11.2%, the consolidation strength is 0.2 kg / cm ² , and the powdering rate is 0.07%. Met.

(Example 7)
The fertilizer composition was granulated and pulverized in the same manner as in Example 5. The granulated product had a grain hardness of 0.5 kgf. The granulated product was put into a hopper and stored for 24 hours under a reduced pressure of 5 kPa. The granule hardness after storage was 3.4 kgf. Subsequently, the granulated product was sized and classified in the same manner as in Example 1 to recover the granular fertilizer composition. The yield of the granular fertilizer composition was 71%, the ratio of the particle size of 2 mm or more and 4 mm or less was 92.3%, and the particle hardness was 3.4 kgf. Further, the moisture content of the granular fertilizer composition is 0.2%, the consolidation rate after one month of the consolidation test is 5.8%, the consolidation strength is 0.1 kg / cm ² , and the pulverization rate is 0.05%. Met.

(Comparative Example 1)
The fertilizer composition was granulated and pulverized in the same manner as in Example 1. Subsequently, the granulated product was sized and classified in the same manner as in Example 1 to recover the granular fertilizer composition. The yield of the granular fertilizer composition was 42%, the ratio of the particle diameters of 2 mm or more and 4 mm or less was 94.7%, and the particle hardness was 0.7 kgf. The moisture content of the granular fertilizer composition is 0.4%, the consolidation rate after one month of the consolidation test is 87.4%, the consolidation strength is 6.6 kg / cm ² , and the powdering rate is 1.6%. Met.

(Comparative Example 2)
The fertilizer composition was granulated and pulverized in the same manner as in Example 2. Subsequently, the granulated product was sized and classified in the same manner as in Example 1 to recover the granular fertilizer composition. The yield of the granular fertilizer composition was 40%, the ratio of the particle size of 2 mm or more and 4 mm or less was 94.3%, and the particle hardness was 0.6 kgf. The moisture content of the granular fertilizer composition is 0.5%, the consolidation rate after one month of the consolidation test is 77.9%, the consolidation strength is 5.4 kg / cm ² , and the powdering rate is 1.8%. Met.

(Comparative Example 3)
The fertilizer composition was granulated and pulverized in the same manner as in Example 3. Subsequently, the granulated product was sized and classified in the same manner as in Example 1 to recover the granular fertilizer composition. The yield of the granular fertilizer composition was 43%, the ratio of the particle size of 2 mm or more and 4 mm or less was 94.9%, and the particle hardness was 0.8 kgf. Further, the moisture content of the granular fertilizer composition is 0.7%, the consolidation rate after one month of the consolidation test is 50.5%, the consolidation strength is 3.3 kg / cm ² , and the powdering rate is 1.6%. Met.

(Comparative Example 4)
The fertilizer composition was granulated and pulverized in the same manner as in Example 4. Subsequently, the granulated product was sized and classified in the same manner as in Example 1 to recover the granular fertilizer composition. The yield of the granular fertilizer composition was 31%, the ratio of the particle size of 2 mm or more and 4 mm or less was 93.8%, and the particle hardness was 0.1 kgf. Moreover, the moisture content of the granular fertilizer composition is 3.0%, the consolidation rate after one month of the consolidation test is 39.4%, the consolidation strength is 1.5 kg / cm ² , and the powdering rate is 2.5%. Met.

(Comparative Example 5)
The fertilizer composition was granulated and pulverized in the same manner as in Example 5. Subsequently, the granulated product was sized and classified in the same manner as in Example 1 to recover the granular fertilizer composition. The yield of the granular fertilizer composition was 35%, the ratio of the particle size of 2 mm or more and 4 mm or less was 92.5%, and the particle hardness was 0.5 kgf. The moisture content of the granular fertilizer composition is 2.9%, the consolidation rate after one month of the consolidation test is 45.4%, the consolidation strength is 2.7 kg / cm ² , and the powdering rate is 2.0%. Met.

(Comparative Example 6)
The fertilizer composition was granulated and pulverized in the same manner as in Example 6. The granule hardness was 0.6 kgf. The granulated material was deposited in a warehouse and stored at a temperature of 27 ° C. for 180 minutes. The granule hardness after storage was 1.8 kgf. Subsequently, the granulated product was sized and classified in the same manner as in Example 6 to recover the granular fertilizer composition. The yield of the granular fertilizer composition was 36%, the ratio of the particle size of 2 mm or more and 4 mm or less was 92.9%, and the particle hardness was 1.8 kgf. In addition, the moisture content of the granular fertilizer composition is 2.5%, the consolidation rate after one month of the consolidation test is 24.5%, the consolidation strength is 0.8 kg / cm ² , and the pulverization rate is 1.3%. Met.

(Comparative Example 7)
The fertilizer composition was granulated and pulverized in the same manner as in Example 7. The granulated product had a grain hardness of 0.5 kgf. The granulated product was put into a hopper and stored for 6 hours under a reduced pressure of 5 kPa. The granule hardness after storage was 2.2 kgf. Subsequently, the granulated product was sized and classified in the same manner as in Example 1 to recover the granular fertilizer composition. The yield of the granular fertilizer composition was 38%, the ratio of the particle size of 2 mm or more and 4 mm or less was 92.1%, and the particle hardness was 2.2 kgf. Moreover, the moisture content of the granular fertilizer composition is 2.1%, the consolidation rate after one month of the consolidation test is 22.5%, the consolidation strength is 0.6 kg / cm ² , and the powdering rate is 1.2%. Met.

  As described above, after granulating the fertilizer composition to obtain a granulated product, the granular hardness of the granulated product is increased to 3 kgf or more and then granulated to obtain a granular fertilizer composition. Compared with the case of obtaining a granular fertilizer composition by sizing a granulated product having a hardness of less than 3 kgf, the yield was high, the amount of consolidation was small, and the generation of dust could be reduced.

  According to the present invention, by increasing the particle hardness of the granulated product after granulation of the fertilizer composition, it is possible to produce a granular fertilizer composition having a high yield, a small amount of consolidation, and less dust generation. The granular fertilizer composition obtained by the present invention can be applied not only to fertilization by humans on a small farm but also to machine spraying on a large farm. Moreover, it can manufacture as a raw material the fertilizer composition which adjusted the combination and content of 1 type, or 2 or more types of components chosen from a nitrogen fertilizer component, a phosphorus fertilizer component, a potassium fertilizer component, and combustion ash according to a use and purpose, Furthermore, since it can be made into the bulk blend fertilizer which dry-blended two or more types of this granular fertilizer composition in arbitrary ratios, it can be used for growth of rice, vegetables, fruits, etc.

Claims (13)

A method for producing a granular fertilizer composition, comprising granulating a fertilizer composition to obtain a granulated product, increasing the particle hardness of the granulated product to 3 kgf or more, and then regulating the granulation. The said granulation process is a compression granulation system, The manufacturing method of the granular fertilizer composition of Claim 1 characterized by the above-mentioned. The said granulation process compresses by the briquette method using a pair of roller, The manufacturing method of the granular fertilizer composition of Claim 2 characterized by the above-mentioned. The method for producing a granular fertilizer composition according to claim 2 or 3, wherein the granulation step is granulated at a granulation pressure of 0.6 kN / cm or more. The method for producing a granular fertilizer composition according to any one of claims 1 to 4, wherein any one of the following 1) to 3) is performed to increase the grain hardness of the granulated product.
1) The granulated product is heated at 100 ° C. or higher and 150 ° C. or lower for 10 minutes or longer.
2) Store the granulated product at 10 ° C. or higher and 40 ° C. or lower for 6 hours or longer.
3) Store the granulated material for 1 day or more under a reduced pressure of 10 kPa or less. The granular fertilizer composition according to any one of claims 1 to 5, wherein the granular fertilizer composition contains at least one selected from a nitrogen fertilizer component, a phosphorus fertilizer component, a potassium fertilizer component, and combustion ash. Method. The method for producing a granular fertilizer composition according to claim 6, wherein the nitrogen fertilizer component includes at least one selected from ammonia sulfate, ammonium chloride, ammonia phosphate, ammonia nitrate, and urea. The method for producing a granular fertilizer composition according to claim 6, wherein the phosphorus fertilizer component includes at least one selected from superphosphate lime, heavy superphosphate lime, and molten phosphorus fertilizer. The method for producing a granular fertilizer composition according to claim 6, wherein the potassium fertilizer component includes at least one selected from potassium sulfate, potassium chloride, and potassium silicate. The fertilizer composition containing the combustion ash includes talc, polyethylene glycol, metal stearate, metal lauryl sulfate, kaolin, calcium carbonate, silicon oxide, calcium terephthalate, aluminum oxide, titanium oxide, calcium phosphate, and lithium fluoride. The method for producing a granular fertilizer composition according to any one of claims 6 to 9, comprising at least one selected granulation accelerator and water. The method for producing a granular fertilizer composition according to claim 10, wherein the granulation accelerator contains 1 to 10 parts by weight with respect to 100 parts by weight of combustion ash. The method for producing a granular fertilizer composition according to claim 10 or 11, wherein water contains 1 to 10 parts by weight with respect to 100 parts by weight of combustion ash. The method for producing a granular fertilizer composition according to any one of claims 1 to 12, wherein the sizing step uses a spherical sizing machine.