JPH101381A - Production of granular fertilizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a granular fertilizer less liable to powder during storage, easy to handle and having a uniform ratio between effective components in the granules by adding a specified lubricant to a urea fertilizer or a prescribed compound fertilizer and press-molding them. SOLUTION: One or more kinds of lubricants selected from among fatty acids such as stearic acid, fatty acid salts such as sodium oleate, fatty acid amides such as oleic acid amide, fatty acid esters such as hardened oil, aliphatic alcohols such as stearyl alcohol, aliphatic hydrocarbons such as natural paraffin, tar and pitch are added to a urea fertilizer or a compound fertilizer contg. urea and/or its compd. such as isobutylaldehyde-urea, HCHO-urea or guanyl urea phosphate and they are press-molded. The amt. of the lubricants used is preferably about 0.1-20 pts.wt. per 100 pts.wt. of the fertilizer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fertilizer which is easy to handle because it is less likely to be powdered during storage, and has a uniform ratio of fertilizing components for each grain. The present invention relates to a method for producing a granular fertilizer that enables the production of fertilizer.

[0002]

2. Description of the Related Art Conventionally, there is a chemical fertilizer as a typical granular fertilizer. However, since it is granulated using water as a binder, a fertilizing component such as lime nitrogen reacts with moisture and is lost. However, depending on the type and properties of the fertilizer, granules having sufficient grain hardness cannot be obtained. Therefore, it has been proposed to granulate or press-mold using urea instead of water (Japanese Patent Publication No. 47-13085). However, in this method, a large amount of heat is required for preheating and press-forming the raw material. , The production cost soared, the load on the equipment was large, and it was not suitable for mass production, and the yield was poor. Furthermore, since 25 parts by weight of urea is equivalent to about 10 parts by weight of nitrogen, it cannot be applied to the case of producing a fertilizer having a small standard value of the total amount of nitrogen, or cannot be used as a fertilizer such as lime nitrogen. -There was a problem that it was necessary to reduce the amount of other nitrogenous fertilizers having excellent medicinal properties.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and relates to the granulation of a urea fertilizer alone or a composite fertilizer containing urea and / or a urea compound. Is to produce a high yield of granular fertilizer that is less likely to be powdered. In particular, when the fertilizer is a compound fertilizer containing urea and / or a urea compound,
Urea and / or a urea compound are contained as a fertilizer component and function as a binder, and a wide variety of fertilizers other than urea and / or a urea compound are granulated and compounded. The purpose is to produce a composite granular fertilizer.

[0004]

That is, the present invention provides at least one lubricant selected from the group consisting of fatty acids, fatty acid salts, fatty acid amides, fatty acid esters, aliphatic alcohols, aliphatic hydrocarbons, tars and pitches. This is a method for producing a granular fertilizer, characterized in that it is added to a urea fertilizer alone or to a composite fertilizer containing urea and / or a urea compound and then press-molded.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail.

[0006] Japanese Patent Publication No. 47-13085 discloses that
It is described that when a mixture of lime nitrogen, phosphorus fertilizer, and potassium salt is press-formed with urea, it is necessary to preheat the mixture at 120 to 140 ° C. However, such a mixed raw material has poor heat transfer efficiency. Heating increases equipment size, which is disadvantageous in terms of cost and production. When the preheating temperature is increased to 130 ° C. or higher, the decomposition of urea becomes remarkable, and not only the yield decreases, but also the generation of ammonia leads to deterioration of the surrounding environment. In addition, the equipment temperature becomes too high, causing grease to flow out of the pressure forming equipment and the bearings to seize.

Therefore, as in the present invention, at least one lubricant selected from the group consisting of fatty acids, fatty acid salts, fatty acid amides, fatty acid esters, fatty alcohols, aliphatic hydrocarbons, tars and pitches is further added and added. By pressing, the preheating temperature can be greatly reduced, the yield is improved, and a wide variety of fertilizers can be uniformly granulated.

[0008] Specific examples of the lubricant used in the present invention include fatty acids such as stearic acid, oleic acid, palmitic acid, behenic acid, lauric acid and myristic acid, preferably stearic acid. As the fatty acid salt, sodium, potassium, calcium,
Metal salts such as sodium and lead, and preferably sodium oleate. Examples of the fatty acid amide include stearic acid amide, oleic acid amide, ethylene bis stearoamide, methylol stearoamide, and the like, and preferably oleic acid amide. Fatty acid esters include hardened oils, butyl stearate, ethylene glycol, monostearate, glycerin esters, sorbitan esters, and the like, and are preferably hardened oils. Further, as the aliphatic alcohol, stearyl alcohol, cetyl alcohol, and the like, and as the aliphatic hydrocarbon, liquid paraffin, natural paraffin, synthetic paraffin, microwax, polyethylene wax, chlorinated hydrocarbon, and the like, Preferably it is natural paraffin.

In the present invention, the lubricant is used in an amount of about 0.1 to 20 parts by weight, preferably 0.2 to 5 parts by weight, per 100 parts by weight of urea fertilizer or 100 parts by weight of a compound fertilizer containing urea and / or a urea compound. Parts by weight. When the amount of the lubricant is less than 0.1 part by weight, when the preheating temperature at the time of press-molding the raw material fertilizer is set to, for example, 100 ° C. or lower, the press resistance increases and molding becomes impossible, or the compression becomes impossible at the particle surface. , The inside of the particles becomes porous, and the storage stability and handleability deteriorate due to a decrease in particle hardness, powdering of the particles, and the like.
On the other hand, when the amount of the lubricant exceeds 20 parts by weight, the compressive stress of the whole kneaded material at the time of pressure molding decreases, and the yield deteriorates.

In the present invention, when the fertilizer is a compound fertilizer containing urea and / or a urea compound, a wide variety of fertilizers are granulated if the content ratio of the urea and / or urea compound is 5% by weight or more. In addition, it is possible to produce a composite granulated fertilizer having a uniform fertilizing component for each grain with a high yield. Here, examples of the urea compound include isobutyraldehyde-urea, acetaldehyde-urea, formaldehyde-urea, guanylurea phosphate and the like. Examples of the fertilizer other than urea and / or the urea compound in the composite fertilizer include lime. Examples include nitrogen, potassium chloride, potassium sulfate, fused phosphorus fertilizer, and calcined phosphorus fertilizer.

The press forming machine used in the present invention is a die forming machine such as an extruding machine such as a screw type, a rotary porous die and a rotary blade, and a compression molding machine such as a compression roll, a briquetting roll and a tableting machine. Any type of molding machine in which the raw material is pressurized can be used. The preheating temperature during pressure molding is
It is not necessary to raise the temperature as in the prior art, and a temperature of about 100 ° C. or less is sufficient.

[0012]

The present invention will be described more specifically with reference to examples and comparative examples.

(Examples 1 and 2 Comparative Example 1) The raw material mixture shown in Table 1 was preheated at the temperature shown in Table 1 and then press-molded with an extruder to obtain a composite granular fertilizer having a product temperature shown in Table 1. (A column having a diameter of about 3 mm and a height of about 0.5 to 5 mm) was manufactured. This is a polyethylene bag (0.18m thick)
m), 20 kg was sealed in the room at room temperature, and the generation rate of powder having a diameter of 0.1 mm or less was measured at regular intervals. Table 2 shows the results.

[0014]

[Table 1]

[0015]

[Table 2]

Example 3 Comparative Example 2 A composite granular fertilizer was produced according to Example 1, except that the raw material mixture shown in Table 3 was used. Table 4 shows the results.

[0017]

[Table 3]

[0018]

[Table 4]

Examples 4 to 6 Comparative Example 3 A composite granular fertilizer was produced in the same manner as in Example 1 except that the raw material mixtures shown in Table 5 were used. Table 6 shows the results.

[0020]

[Table 5]

[0021]

[Table 6]

Examples 7 to 11 Composite granular fertilizers were produced in the same manner as in Example 1 except that the raw material mixtures shown in Table 7 were used. Table 8 shows the results. Table 8 also shows the results when no lubricant was added (Comparative Example 1).

[0023]

[Table 7] [Note: The lubricant symbol “A” is stearyl alcohol, “B” is sodium oleate, and “C” is paraffin. ]

[0024]

[Table 8]

(Example 12) A sample of about 200 g from 500 kg of the composite granular fertilizer produced in Example 1 was sampled from five arbitrary places, and the uniformity of the fertilizing component for each grain was evaluated. The results are as shown in Table 9 and were extremely uniform.

[0026]

[Table 9]

Examples 13 to 19 Comparative Example 4 Urea fertilizers were granulated according to Example 1 using the lubricants shown in Table 10. The preheating temperatures were all normal temperature (25 ° C.).
Table 10 shows the results.

[0028]

[Table 10]

[0029]

According to the method for producing a granular fertilizer of the present invention,
Granulation of urea fertilizer alone or a composite fertilizer containing urea and / or a urea compound can be performed with high yield.

In particular, when the fertilizer of the present invention is a compound fertilizer containing urea and / or a urea compound, in addition to the above effects, a fertilizer having a uniform fertilizing component for each grain is produced.
A single application enables uniform fertilization of crops. Moreover, the powder is less likely to be powdered during storage and is easy to handle.

Claims (1)

[Claims] 1. A urea fertilizer alone or urea and / or a urea compound, comprising at least one lubricant selected from the group consisting of fatty acids, fatty acid salts, fatty acid amides, fatty acid esters, fatty alcohols, aliphatic hydrocarbons, tars and pitches. A method for producing a granular fertilizer, comprising adding to a composite fertilizer containing the above and press-forming.