JPS6059200B2 - Granular fused phosphorus fertilizer with good disintegration properties and its production method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a granular fused phosphorus fertilizer with good disintegrability and a method for producing the same.

Commercially available fertilizers are subject to regulations regarding their quality, physical properties, etc. under the Fertilizer Control Act, etc., but the particle size of molten phosphorus fertilizer is 2000.
Since there is a standard for micro-alloys, molten phosphorus fertilizer raw materials are melted, quenched with ice, placed in wooden frames, and sold as sand-like products with a size of 2000 microns or less. However, sand-like products have problems in fertilization, such as their small particle size and high bulk specific gravity, making it difficult to apply fertilizer uniformly and difficult to bulk blend with other fertilizers.

Also, in mechanical fertilization, there is a need for a method of evenly distributing sandy materials.

Granular products are suitable for uniformly distributing molten phosphorus fertilizer, and various methods have been proposed for making it into granular products.

For example, there is a method of granulating the sand-like product using pulp waste liquid, waste sugar fermentation waste liquid, or a combination of these solutions and bentonite as a binder, but this granulated product has poor disintegration when fertilized, so it is not practical. .

In addition, there is a method of mixing phosphoric acid solution with molten phosphorus fertilizer and granulating it, or mixing molten phosphorus fertilizer with deuterium stone, etc., and reacting and granulating it with phosphoric acid solution or a mixed acid with sulfuric acid and phosphoric acid. There is a way.

However, these are not molten phosphorous fertilizers alone, but granulated fertilizer elements, and are treated as mixed phosphorous fertilizers under the Fertilizer Control Law. It is a simple substance of granular molten phosphorus fertilizer.
There is a demand for a fertilizer that does not disintegrate during transportation or fertilization, and has excellent disintegration properties in water and soil so that it can exhibit sufficient fertilizing effect after fertilization. The purpose of the present invention is to solve these drawbacks, and when granulating a granulated product of molten phosphorus fertilizer, water of alkaline earth metal is added to the granulated product of molten phosphorus fertilizer. Either add a small amount of oxide and add a binder to it and knead and granulate it, or add and mix a small amount of alkaline earth metal hydroxide to the pulverized product, put it into a granulator, and mix it with a binder. The present invention aims to provide a granular molten phosphorus fertilizer with good disintegrability by granulating it while spraying it, and a method for producing the same.

That is, the first invention of the present invention consists of granular fused phosphorus fertilizer with a particle size of 0.8 to 5 m/m granulated using an alkaline earth metal hydroxide and waste sugar fermentation waste liquid or valve waste liquid. ,
Moreover, its bulk specific gravity is 1.15 to 1.35 and hardness is 1 to 6k9.
/C! i1, and the residual rate in the underwater disintegration test of particles with a particle size of 2 m/m or more is O~2 mass%, and the hardness of the soil-treated particles in the in-soil disintegration test is 100y.
The following is a granular molten phosphorus fertilizer, and the second invention is when manufacturing granular molten phosphorus fertilizer from a water pulverized product of molten phosphorus fertilizer,
0.1 to 1.0% by weight of an alkaline earth metal hydroxide is added and mixed to the fine powder that passes 85% by weight or more through a Tyra standard sieve having a particle size of 589μ, and further. A method for producing granular fused phosphorus fertilizer with good disintegrability, which is characterized by adding waste sugar fermentation waste liquid or valve waste liquid to this, kneading it, and then introducing it into a granulator and granulating it while spraying water. And, the third invention is to produce granular molten phosphorus fertilizer from a water pulverized product of molten phosphorus fertilizer! When the particle size of the granulated product is 589
0.1 to 1.0% by weight of an alkaline earth metal hydroxide is added to the fine powder that passes through a standard μ Tyler sieve of 85% by weight or more, and then the mixture is introduced into a granulator for waste molasses fermentation. Granulating while spraying waste liquid or valve waste liquid.
This is a method for producing granular fused phosphorus fertilizer with good disintegration properties. The present invention will be further explained in detail below.

The first invention of the present invention is a method in which molten phosphorus fertilizer fine powder is granulated using an alkaline earth metal hydroxide in addition to a conventionally known binder, such as waste sugar fermentation waste liquid or valve waste liquid, Its particle size is 0.8-5wL/m1, and its bulk specific gravity is 1.15-1.
35, has a hardness of 2 to 6k9/Clt, and has low disintegration in water and soil, so it has a fertilizing effect equal to or greater than that of conventional sand-like products, and is easy to apply. . The product of the present invention has a particle size of 0.8 to 5TrL/7TL.
Since the bulk specific gravity is 1.15 to 1.35, it can be uniformly spread by hand or mechanical sowing, and its hardness is 1 to 6k9/Clt. Because of this, it does not disintegrate during bagging, warehousing, or transportation of products, and it disintegrates easily when fertilized, so its fertilizing effect is comparable to that of conventional sand-like products.Hereinafter, the present invention will be further described. explain in detail.

The present invention is a granular molten phosphorus fertilizer and its manufacturing method. In the present invention, it is important to use an alkaline earth metal hydroxide as an additive to the molten phosphorus fine powder, and by using this, Granular molten phosphorus fertilizer with good disintegration properties is obtained.

Note that the disintegration property of the present invention is determined by the measurement method described below under the guidance of the Ministry of Agriculture, Forestry and Fisheries. As the fused phosphorus fertilizer used in the present invention, a commercially available fused phosphorus water granulated product may be used as it is, and it is further pulverized so that the particle size is 85% by weight passing through a Tyler standard sieve 28 mesh (opening 589μ). A powdered product is preferable, but a commercially available granulated product may be sieved to obtain the above-mentioned particle size.

Further, any alkaline earth metal hydroxide can be used, but among these, calcium hydroxide, magnesium hydroxide, etc. are preferred.

The amount of alkaline earth metal hydroxide added is 0.1 to 1. %, and sufficient disintegration properties cannot be obtained outside this range. Examples of the binder include molasses waste liquid, valve waste liquid, etc., but the binder is not limited thereto, and any binder may be used as long as it has the same effect as these.

The amount added is 2 to 2% by weight, preferably 5 to 15% by weight, based on the molten phosphorus fertilizer. The reason for this is that a sufficient binding effect cannot be obtained with a small amount, whereas a granulated product with an appropriate particle size cannot be obtained with a large amount. To give an example of the granulation method of the present invention, first, alkaline earth metal hydroxide is added to the above-mentioned fused phosphorus fertilizer powder, thoroughly mixed, and then the waste molasses fermentation waste liquid or valve waste liquid is added. etc. are added as a binder, kneaded, granulated, and further dried.

As another example, after adding alkaline earth metal hydroxide to molten phosphorus fertilizer powder, this is introduced into a granulator,
Examples include granulating while spraying the binder described above. As explained above, the present invention adds a small amount of alkaline earth metal hydroxide to fine powder of molten phosphorus,
Furthermore, the present invention is characterized by adding a binder to the granulated product and granulating it, and the present invention has the effect that a granular product having excellent disintegration properties in water and soil can be obtained.

In the present invention, a method for granulating a single molten phosphorus fertilizer has been described, but the alkaline earth metal hydroxide used as an additive can be used for other fertilizers such as calcium carbonate fertilizer, mixed lime fertilizer, ore silicate fertilizer. , hydroxide magnesium fertilizer,
By-product basic fertilizer, potassium magnesium fertilizer, manganese slag fertilizer,
It can be applied as a binder for melted trace element compound fertilizers, etc.

A more detailed explanation will be given below with reference to Examples. Example 1 Melted phosphorus fertilizer (C-P2O5=21.60%C-MgO=1
4.67%S-SlO2=23.12%) particle size is 58
Using a fine powder that passes 85% by weight through a 9μ Tyler standard sieve, a predetermined amount of slaked lime is added, and 1 rut amount% of waste molten fermentation waste liquid is added to the molten phosphorous fertilizer and kneaded. It was introduced into a granulator and granulated while spraying an appropriate amount of water. The moisture content of the Koi granulated product is 1. It was dried in a drum type dryer to reduce the weight to % or less. These conditions and results are shown in Table 1, the components of the waste molasses fermentation waste liquor are shown in Table 2, and the component analysis values of the granulated product are shown in Table 3.

Example 2 The same procedure as Example 1 was carried out except that the amount of binder was changed.

The conditions and results are shown in Table 4. Example 3 The same procedure as in Example 1 was carried out, except that molten phosphorous fertilizer and magnesium hydroxide were mixed, introduced into a granulator, and granulated while spraying a binder.

The conditions and results are shown in Table 5. As shown in the above example, when molten phosphorus fertilizer is granulated using waste sugar fermentation fermentation waste liquid as a binder, the hardness of the granulated product is as follows: 3~5kg/c! i
When waste sugar dense liquid is used at 6% of molten phosphorus fertilizer, the hardness of the grains is 2 to 4k9/Cfi, which is proportional to the amount of binder used. There is no problem, but the disintegration in water and soil shows that granules granulated without slaked lime or magnesium hydroxide have a residual percentage of disintegration in water (%) of 32-34%, and the hardness of soil treated products is 32-34%. When the voltage is 120 to 125V, the disintegration property is poor and the fertilizer effect is reduced.

Add 0.0% slaked lime or magnesium hydroxide to the molten phosphorus fertilizer powder.
When 1 to 1% was added and mixed and granulated using the waste sugar fermentation waste liquid, the remaining percentage of disintegration in water was 4 to 16%, which was sufficient to disintegrate in water, and the hardness of the soil treated product was 56 to 85 f. The disintegration properties of the granular product were good.

However, if slaked lime or magnesium hydroxide is used in an amount of 2% based on molten phosphorus fertilizer, the disintegration properties both in water and in soil will deteriorate.

Claims (1)

[Scope of Claims] 1 Consists of granular molten phosphorus fertilizer with a particle size of 0.8 to 5 m/m granulated using alkaline earth metal hydroxide and waste sugar fermentation waste liquid or pulp waste liquid, and Bulk specific gravity 1.15~
1.35, a hardness of 1 to 6 kg/cm^2, and a particle size of 2 m/m or more, with a residual rate of 0 to 20% by weight in an underwater disintegration test, and soil-treated particles in an in-soil disintegration test. Granular fused phosphorus fertilizer with a hardness of 100g or less. 2. When producing granular molten phosphorus fertilizer from a granulated molten phosphorus fertilizer, the hydration of alkaline earth metals is applied to the fine powder that passes 85% by weight or more through a Tyra standard sieve with a particle size of 589μ. Add and mix 0.1 to 1.0% by weight of the ingredients, further add waste sugar fermentation waste liquid or pulp waste liquid to this and knead,
A method for producing granular molten phosphorus fertilizer with good disintegrability, which is then introduced into a granulator and granulated while spraying water. 3. When producing granular molten phosphorus from a granulated molten phosphorus fertilizer, alkaline earth metal hydroxide is added to the fine powder that passes through a Tyler standard sieve with a particle size of 589 μ in an amount of 85% by weight or more of the granulated molten phosphorus. A granular melt with good disintegrability characterized by adding and mixing 0.1 to 1.0% by weight of Method for producing phosphorus fertilizer.