JP2001233689A - Method for reducing caking property of granular fertilizer and granular fertilizer having caking property reduced by the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for reducing the caking property (tendency) of a fertilizer, especially a chemical fertilizer, and to provide a fertilizer having a reduced caking property. SOLUTION: This method for reducing the caking property of a granular fertilizer, comprising mixing fertilizer granules with microsilica in an amount of about 5 g to about 50g per kg of the fertilizer granules to coat the granules of the fertilizer, characterized by mixing the fertilizer granules with the microsilica subjected to a semi-desification process to increase the bulk density to 425 to 550 kg/m3. Further, these is provided a granular fertilizer having a reduced caking property.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for reducing the cohesiveness (propensity) of fertilizers, especially chemical fertilizers, and to a fertilizer having reduced cohesion by this method.

[0002]

BACKGROUND OF THE INVENTION U.S. Pat. No. 3,619,163 discloses that silicon dioxide containing fume dust recovered from a metallurgical refining furnace for the production of cast iron, ferroalloy or silicon is mixed with fertilizer particles.
A method for reducing the caking properties of a granular fertilizer comprising coating the fertilizer particles is disclosed.

[0003]

The silicon dioxide-containing fume dust used is a group of very small particles having a surface area of 15-20 m ² / g. The particle size of the fume dust (hereinafter referred to as micro silica) is about 0.15μ.
m and a very low bulk density in the range of 150-300 kg / m ³ . In the method disclosed in the aforementioned U.S. Pat. No. 3,619,163, the handling of microsilica produces a large amount of dust, and therefore, environmental problems occur. Furthermore, the transport of such substances to fertilizer plants is very expensive due to the very low bulk density. These problems have reduced the use of this method disclosed in the aforementioned U.S. Pat. No. 3,619,163.

[0004]

SUMMARY OF THE INVENTION The aforementioned U.S. Pat. No. 3,619,16 is disclosed.
It has been found that the above-mentioned deficiencies of the method disclosed in No. 3 can be solved by using certain types of treated microsilica. Therefore, the object of the present invention is to
It is an object of the present invention to provide a method for reducing caking which overcomes the deficiencies of the methods described above. Yet another object is to provide a granular fertilizer with reduced caking.

[0005] Accordingly, the present invention provides a method for producing fertilizer particles comprising the steps of:
A method for reducing the cohesiveness of a granular fertilizer that coats fertilizer particles by mixing with microsilica in an amount of about 5 g to about 50 g per gram, wherein the bulk density is increased to 425 to 550 kg / m ³ , semi-compacted Process (semi-densification process)
Mixing the fertilizer particles with the fertilizer particles, wherein the fertilizer particles are mixed with fertilizer particles.
It relates to a granular fertilizer having reduced cohesiveness of the fertilizer, characterized in that it is mixed with a microsilica in an amount of 50 g and has a bulk specific gravity of 425-550 kg / m ³ .

It has been surprisingly found that the use of microsilica having a bulk density in the above-mentioned range results in a coating effect that is surprisingly equivalent or better than the use of untreated microsilica. Furthermore, since the bulk weight of semi-densified microsilica is about three times greater than the bulk density of untreated microsilica,
The dusting problem has been solved and the transportation cost of microsilica has been substantially reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In one particular embodiment, 480 kg
/ M ³ semi-compressed micro silica having a bulk density of:
An amount of 20 g per kg of fertilizer was mixed with the granular fertilizer in a drum mixer. After storage for 8 months under normal conditions, no caking is observed, and the fertilizer can finally flow out of the storage bottle in a separated state, no dusting is observed during the run-off of the fertilizer Was.

[0008]

According to the present invention, as described above, the granular fertilizer to be treated does not stick even after storage for a long period of time, there is no generation of dust in handling the fertilizer, and the handling of micro silica used However, there was no dusting and the transportation cost was reduced.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kunio Yamamoto 1-5-8 Shimonagaya, Konan-ku, Yokohama-shi, Kanagawa F-term (reference) 4H061 AA01 AA02 DD03 DD18 EE01 GG17 GG41 HH28 HH33 HH45 LL26 LL30

Claims (2)

[Claims] 1. A method for reducing the cohesiveness of a granular fertilizer coating fertilizer particles by mixing the fertilizer particles with microsilica in an amount of about 5 g to about 50 g per kg of the fertilizer, wherein the bulk specific gravity is A method for reducing the cohesiveness of a granular fertilizer, comprising mixing microsilica subjected to a semi-compression step with fertilizer particles, increasing to 550 kg / m ³ . 2. The method of claim 1 wherein the fertilizer particles are added in an amount of 5-50 kg / kg of fertilizer.
was mixed with g of amount of micro-silica and the microsilica is characterized by having a bulk density of 425-550kg / m ^3, reduced granular fertilizer caking fertilizer.