JPS58181779A - Granulation of powdery fused phosphatic fertilizer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention is a method for granulating powdered dissolved phosphorous fertilizer.

%, phosphoric acid was added to the amino acid fermentation waste liquid to a mixture of powdered dissolved phosphorus fertilizer and phosphate lime. This invention relates to a method for granulating melted phosphorous fertilizer using Jt.

If fertilizers or agricultural products are used in powdered form, they will be blown away by the wind, making it difficult to use evenly (and often harmful to the human body.Also, with the mechanization of agriculture, the use of machinery and equipment , methods of granulating fertilizers or fertilizers are being continuously developed in various fields.

fI phosphorous fertilizer is a restricted soluble phosphoric acid fertilizer with lime and lime as subcomponents.
It is an alkaline fertilizer containing minerals, boric acid, etc., and is extremely effective in countries with a lot of acidic soil.

However, fused phosphorus fertilizer is a free fertilizer made by melting phosphorescent material and serpentine at high temperature, quenching it with cold water, drying, and pulverizing it, and since it does not have any binding substances, it is commercialized in powder form. Therefore, it cannot be granulated without adding a caking substance.

Table 1. Particle size distribution of dissolved phosphorous fertilizer As mentioned above, dissolved phosphorous fertilizer is a phosphorus II' fertilizer or an alkaline fertilizer containing lime, magnesia, silicic acid, etc. as subcomponents, so granulation of dissolved phosphorous fertilizer is difficult. The properties of dissolved phosphorus fertilizers must be maintained. Among the methods for granulating melted phosphorous fertilizer, a method of mixing superphosphate lime with strong caking power and melted phosphorous fertilizer and granulating it was published in the Japanese Patent Application Publication in 1987.
8525 and 87-10582. The viscous dissolved phosphorus obtained by this method is good in terms of particle size, longitude, and physical properties, but it has the drawback of acidifying alkaline fertilizers due to the addition of sulfuric acid.

In addition, in the method of spraying a suspension of amino acid fermentation waste liquid and ammonium phosphate onto a powdered dissolved phosphorus fertilizer to form granules (reference 2 Korean Patent No. 7576), the ammonia in the ammonium phosphate evaporates, resulting in powder layer formation. Not suitable for phosphorus fertilizer granulation methods.

In the present invention, in order to eliminate the above-mentioned drawbacks, phosphoric acid is added to the solution of amino acid fermentation l1IIr1 as a caking agent to a raw material obtained by mixing fused phosphorous fertilizer with phosphate lime, which is a reaction product of slaked lime or carbonated lime and phosphoric acid. The mixed solution is not sprayed, but is granulated using a granulator, and then dried to produce a granular dissolved phosphorus fertilizer.

The granular melted fertilizer obtained in this way not only maintains the original properties of melted phosphorous fertilizer, such as alkalinity and the unique properties of phosphoric acid fertilizer, but also has a particle longitude that is not affected. Good disintegration in soil.

In this case, in order to reduce the caking force, the lees may be added deeply to the initial total mixture.

The amine # intoxicated liquid has a specific gravity of 1.1 to 1.2 and a viscosity of 14.
~16 c, p, solid powder 82-40%, moisture 6t8%,
It is a dark brown suspension with a pH of 0 to 5.0 and is effective for one crop.

This secondary eIk liquid and phosphoric acid (PsO 48%) i
Mix at a ratio of 80-95:20-6, with a pH of 2.5-
A mixture of No. 4 is prepared, and this mixture is sprayed onto a mixture of powdered fused phosphorus fertilizer and phosphate lime to granulate it. The production of phosphoric lime in this case is as follows.

Phosphate lime consists of slaked lime or carbonated lime and phosphoric acid in a ratio of 85 to 45:
It is obtained by reacting at a ratio of 85 to 55 and has a restricted soluble phosphoric acid content of 90 or more. In this case, the cap of lime material that reacts with phosphoric acid is adjusted depending on the physical properties of the product.

The analytical values of phosphoric lime obtained by the above method are shown in Table 2 below.
It goes like this.

Table 2 Component analysis value of phosphate lime As shown in Table 2 below, phosphate lime and melted phosphorus fertilizer are mixed from 5 to 20:95 to
After granulating 85 to 90 parts of the raw materials mixed at a ratio of 80% with a cylindrical granulator at 20 to 60°C while spraying 15 to 10 parts of a mixed solution of amino acid and phosphoric acid,
If dried at ℃, a product with a particle diameter of 1 to 4 tons can be obtained.

The ratio 3 of this product is 1.1 to 1.8, which is the original ratio 1.
, much lighter than 7-1.9. Particle breaking strength is 1. υ〜
At 2.8 kFl/particle, it is hard and hard, but it is dispersed in water, so it is excellent as a granular product. In this case, the mixing ratio of dissolved phosphorus fertilizer and phosphoric acid lime, and the mixing ratio of amino #koji soup stock liquid and phosphoric acid. can be adjusted according to the phosphoric acid content of the product. In this case, a total amount of starch less than or equal to aSS may be added to the mixture. Also.

In this case, the mixing ratio of the amino Wlt fermentation sub-acid solution and phosphoric acid is 40:6.

Although granulation is possible without adding phosphoric acid to the amino WR fermentation waste liquid, the mildness is lowered and the physical properties are inferior, so the liquid is used in the amino acid fermentation sub-# to adjust the pH to 8 to obtain a product with high strength. However, phosphoric acid must be added because it has the advantage of controlling the phosphoric acid content of the final product.

Furthermore, the reason why phosphorous lime is produced and mixed and granulated with melted phosphorous fertilizer is that if phosphoric acid is directly added to the melted phosphorous fertilizer, the phosphoric acid content of the melted phosphorous fertilizer will increase, and its dispersibility in water will decrease.

Therefore, first, phosphoric acid is reacted with slaked lime or lime carbonate, which has a light specific gravity, to produce phosphoric acid lime, and then added to the molten phosphorus fertilizer.Since the molten phosphorus fertilizer is O#, the content of lime and magnesia can be reduced over time. This fertilizer maintains the alkalinity, which is the original characteristic of dissolved phosphorus fertilizer, so that crops can be easily harvested in the soil.

As described above, the granular melted phosphorous fertilizer produced according to the present invention makes the most of the characteristics of melted phosphorous fertilizer than the conventional method of granulating melted phosphorous fertilizer, and is available at a very low price. It can be manufactured.

Hereinafter, the present invention will be explained in detail based on examples. However, the present invention is not limited to this example.

Example 1 Amino acid solution (specific gravity 1.2, Sonogata powder 85 cm) 92
8 parts of phosphoric acid (P20s: 48%) was mixed and stirred to adjust the pH to 8. In a cylindrical granulator with a diameter of 2.5 m and a length of a5 vortices, the phosphate lime listed in Table IVcIiI12 was
．． After death, the amino F11 fermentation subconcentrate was granulated at 60°C while spraying the above amino F11 fermentation subconcentration liquid at a rate of 4 tons/hour.
After drying for 2 seconds in a sieve (5 m, length 1 x 5 m), only particles with a grain size of 1 to 49 were taken out as a product, and the remaining 1% was circulated.

In this case, the specific gravity of the product is 1.2 and the particle breaking strength is 2°5 #
/ Particles. Products 25 to 9 were packaged in α26 polyethylene bags and subjected to a drop test of 1.5 mCD from 4 sides 10 times, and as a result, the breakage rate of 19 or less was less than ls.

The analysis results of this product are shown in Table 3 below.

Table & Analytical values of granular dissolved phosphorus fertilizer Example 2 Amino acid fermentation sub@liquid 401! Into the mixture of B and 6 parts of phosphoric acid, add corn powder solution (# powder: water - 2)
:52) was mixed and heated with stirring at a rate of 5.450 tons/hour, granular dissolved phosphorus fertilizer 11 tons/hour, and phosphate lime α111Oδ tons/hour in the above Example 1. It was granulated in the same manner as.

The characteristics of the product obtained in Example 2 were almost the same as those shown in Table 3.

Claims (5)

[Claims] (1) In the method of granulating powdered dissolved phosphorous fertilizer, phosphoric acid is mixed with powdered dissolved phosphorous fertilizer, and then phosphoric acid is added to the aminomi 12tIII fermentation dispersion, and the resulting combined product is sprayed to form granules. A method for granulating melted phosphorous fertilizer, which is characterized by granulating. (2) The ratio of the mixture of powdered fertilized phosphorus fertilizer and scale acid lime is 95 to 8.
The method for granulating melted phosphorus fertilizer according to claim 1, wherein the % mold is 5:5 to 20. (3) Mixing ratio of amino version liquor to phosphoric acid is 80
~95: The method for granulating melted phosphorous fertilizer according to claim 1, wherein the ratio is 20 to 5. (4) The method for granulating melted phosphorus fertilizer according to item 2, wherein the pH of the mixed solution is 26 to 4. (5) To the mixture of 79219611 dispersion and Rin Kai,
The method for granulating melted phosphorous fertilizer according to claim 1, characterized in that a total amount of 8 or less starch is mixed as a caking aid.