JPS60226478A - Manufacture of paste 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 relates to a method for producing a paste fertilizer that is chemically and physically stable and easy to mechanically apply.

In recent years, paste fertilizers are more suitable for mechanical application than general solid fertilizers or liquid fertilizers, and can contain highly concentrated fertilizer ingredients. ■In response to environmental pollution issues in recent years, this paste fertilizer can be applied directly into the soil, so there is less fertilizer runoff compared to the scattering method of solid fertilizer.
Prevent environmental pollution. - Fertilizer components dissolve slowly into the soil, making it possible to reduce the number of times of additional fertilization after fertilization, which, together with labor savings, enables effective use of fertilizer components. It is attracting attention because it has many advantages such as
In particular, for wet rice cultivation, the demand for fertilization is gradually increasing because it is easy to mechanically apply fertilizer into the soil as a starter fertilizer.

However, in order to produce paste fertilizer, it is difficult to uniformly disperse the fertilizer components, and complicated processes such as adding a dispersant must be performed.

Starch as a stabilization method for paste fertilizers.

A known method is to increase the viscosity of the fertilizer solution by adding heavy viscous substances such as CMC, surfactants, or inorganic additives such as bentonite and diatomaceous materials to suppress the separation of components. Both of these lead to solid-liquid separation or component deterioration during long-term storage.

Another method is to coagulate fine particles of a fertilizer composition with fibrous proteins, which requires a long time of 12 to 24 hours to decompose protein-containing raw materials with alkali, and leaves undecomposed substances. If a separate P is required, the operation is complicated and uneconomical. Therefore, there has recently been a strong demand for a paste fertilizer that is more economical and has good storage stability over a long period of time.

Therefore, in view of the current situation, the inventors of the present invention have repeatedly conducted research on gauze, and found that after decomposing 61ffl with alkali, adjusting the pH to 50-75 with wet phosphoric acid, and adding fertilizer salt to this, it is possible to We have discovered that it is possible to economically produce a paste fertilizer with a desired temperature of 11 degrees Celsius, which has excellent storage stability over a long period of time, and has now completed the present invention.

That is, the present invention relates to a method for producing a paste fertilizer, which comprises decomposing +SUB with an alkali, adjusting the pH by 50 to 7.5 tons with wet phosphoric acid, and adding and mixing fertilizer salt thereto.

First, the method for producing a paste fertilizer of the present invention will be explained in more detail.The first operation of the present invention is to decompose yeast with an alkali and adjust the pH of the yeast to 5.0 to 75 with wet phosphoric acid.

l used in the present invention! llff1 is generally known yeast, such as Torula #Mother, baker's yeast, brewer's yeast,
These include feed yeast, and denucleated yeast made from these yeasts and used for nucleic acid production.

On the other hand, as the alkali used to decompose yeast, caustic soda, caustic potash, aqueous ammonia, soda carbonate, potassium bicarbonate, etc. can all be used; In addition to potassium bicarbonate, triethanolamine, jetanolamine.

Particularly preferred are alkanolamines such as monoethanol-nonamines.

When decomposing yeast with an alkali, the alkali is dissolved in water in advance, and yeast powder is added to it in an amount of approximately 5 to 2 ml of the total reaction solution.
Add and stir to make the solution 5%, and bring the solution pH to about 8 or higher.

As the decomposition device, it is effective to use a device having various pulverizing functions such as a colloid mill or a ball mill, in addition to an ordinary reaction device equipped with a stirrer.

The decomposition time varies depending on the concentration of yeast in the type 1 decomposition liquid of the type 1 decomposition device (PR, #81), but is approximately 10 to 18
The decomposition time can be further shortened by heating at this time. After decomposition, the pH of the solution is reduced to 5 using wet phosphoric acid.
Adjust by 0 to 7.5t.

The reason why wet phosphoric acid is used for neutralization is that when dry phosphoric acid or acids other than phosphoric acid are used, it is difficult to obtain a stable paste after adding the fertilizer salt described later, that is, when making a paste fertilizer. Furthermore, even if the neutralization pH is outside this range, the paste is similarly unstable, and fertilizer salts separate and precipitate during storage. The reason why wet phosphoric acid stabilizes paste fertilizer is not necessarily clear, or it is speculated that it is because Fe and Al contained in wet phosphoric acid form gel-like hydrates during neutralization. Ru.

The second operation is to add and mix fertilizer salt into this decomposed and neutralized solution, and it is desirable to use finely powdered fertilizer salt from the viewpoint of workability, dispersion efficiency, and paste stability.

Regarding fertilizer salts, commonly used solid fertilizers are pulverized, preferably pulverized to 60 meSh or more, and these fertilizer salts include calcium nitrate, ammonium phosphate, urea, potassium chloride, ammonium nitrate,
Other eik element fertilizers etc. are used.

The amount of fertilizer salt added depends on the type of fertilizer salt used, its component content, alkali, the amount of alkali material required for J 4 II'', the amount of wet phosphoric acid required for neutralization, etc. Although it varies, approximately 5 to 35 times the weight of yeast is added to the amount of yeast used previously, and moderate stirring is performed.

In addition, the fertilizer salt of the present invention is added after the yeast is alkali decomposed and neutralized with wet phosphoric acid as described above.
Another method, in which fertilizer salts are first added to alkaline-decomposed yeast and neutralized with wet phosphoric acid, results in the formation of precipitates within a short period of time after production, resulting in an unstable, low-viscosity paste. For this reason, the timing of addition of fertilizer salt is extremely important in the present invention.

The paste fertilizer of the present invention obtained in this way has a long-term t
It has excellent storage stability without the formation of sludge precipitates, requires a short time to decompose the matrix, and the process is simple, making it economical and inexpensive to obtain a paste fertilizer with the desired viscosity. becomes possible.

In addition, after application of the paste fertilizer of the present invention, it is slowly dispersed in the soil, resulting in good fertilizer efficacy and has many advantages such as no need for follow-up when used as a base fertilizer in rice cultivation.

In addition, fertilizer is suitable as a culture solution for so-called soilless cultivation such as hydroponics, sand cultivation, gravel cultivation, etc. Moreover, it is much more concentrated than liquid fertilizer, making it easier to transport.

It also has the advantage of greatly reducing storage costs.

The present invention will be further explained below with reference to Examples, but the present invention is not limited to these Examples.

In the examples, % indicates weight % unless otherwise specified.

Example 1 4 parts of denucleated fermented Torula yeast were added to an alkaline aqueous solution prepared by dissolving 6 parts of caustic potash in 23 parts of water, and the mixture was subjected to alkali decomposition at 60°C for 30 minutes with stirring.

The decomposition liquid was converted into wet phosphoric acid (P+Oi: 29.5%).
Neutralize with 20 parts. The pH of the liquid at this time was 60.

Next, potassium chloride 12 finely ground into Ioomesh
Part, ammonium phosphate (II: 18%, P, O.

:46%) and 21 parts of urea were added and thoroughly dispersed and dissolved to form a paste fertilizer. The fertilizer ingredients at this time are T-N
: 125%, T-P, OI: 1234%, T-, 0
: I 2.16%. Also, since the viscosity of this paste fertilizer has naxotropic properties, it is difficult to measure the absolute viscosity, but it is approximately 2.000 to 2.30 at 20°C.
It is 0 cp.

Furthermore, the results of measuring the precipitation amount of coarse crystals and solid-liquid separation rate of this paste fertilizer are shown in Table 1, and the storage stability was good over a long period of time.

(Test method for storage stability) (1) Amount of precipitation of coarse crystals Put paste fertilizer 1002 into a tightly closed glass container,
After being stored in a constant temperature chamber at °C for 30 days, it was sieved through a sieve with a diameter of 0.5 mm, and the amount of residue on the sieve was measured, which was determined as the amount of coarse crystals precipitated.

(2) Solid-liquid separation speed pace) Pour fertilizer into a measuring cylinder with a stopper (No. 11) up to the marked line, leave it to stand still in a thermostat at 50°C, measure the increase in supernatant liquid, and calculate the solid-liquid separation rate. And so.

Example 2 4 parts of Torula yeast was added to an alkaline aqueous solution prepared by dissolving 75 parts of potassium carbonate in 215 parts of water, and 1
Time alkaline decomposition. Wet phosphoric acid 20% of the decomposed solution
Neutralize in the section. The ePH at this time is 55. Subsequently, 12 parts of finely ground potassium chloride, 14 parts of ammonium phosphate, and 21 parts of urea were added to IOOmesh and sufficiently dispersed and dissolved to produce a paste fertilizer. The ingredients of this paste fertilizer are T-N: +2.4%, 'r-pro
s: + 2.4%, T-, O: I 2.5%,
And the viscosity is approximately 2.000 to 2j00C at 20°C.
It is p.

Furthermore, the results of measuring the precipitation amount of coarse crystals and solid-liquid separation rate of this paste fertilizer are shown in Table 1, and the storage stability was good over a long period of time.

For comparison, the Torula yeast was decomposed with alkali and then neutralized with 26 parts of wet phosphoric acid. G at this time! PH is 45
It is. Subsequently, the same finely ground fertilizer salt as above was sufficiently dispersed and dissolved to form a paste-like fertilizer, but coarse crystals precipitated during storage and solid-liquid separation occurred. (Comparative Example 1) Furthermore, for comparison, the Torula yeast was decomposed with alkali and then neutralized with 115 parts of wet phosphoric acid. ilf' at this time
H is 90. Subsequently, the same finely ground fertilizer salt as above was sufficiently dispersed and dissolved to form a paste-like fertilizer, but coarse crystals similarly precipitated during storage, resulting in solid-liquid separation. (Comparative Example 2) Table 1 shows the results of measuring the precipitation amount of coarse crystals and solid-liquid separation rate of these fertilizer solutions.

Table 1 Example 6 5 parts of baker's yeast was added to an alkaline aqueous solution prepared by dissolving 82 parts of caustic potassium in 19.1 parts of water and alkali decomposed at 60°C for 30 minutes with stirring. The decomposed solution was neutralized with 274 parts of wet phosphoric acid. The pH at this time is 62. Next, 9.5 parts of finely ground potassium chloride, 1 part of ammonium phosphate
83 parts of urea and 145 parts of urea were added and sufficiently dispersed and dissolved to form a paste fertilizer. The ingredients of this paste fertilizer are T-N:10
2%, T-Ploi:I 6.5%IT K+O
:I 2.4% and viscosity is 2.500-2.900 cp
It is.

Table 2 shows the results of measuring the precipitation amount of coarse crystals and solid-liquid separation rate of this paste fertilizer, and the long-term storage stability was good.

Also, for comparison, is the above baker's yeast similarly digested with alkaline? Dry phosphoric acid (PfJK: 5 it%) 1
55 parts were added to neutralize. The pH at this time is 62.

Subsequently, the same finely ground fertilizer salt as above was sufficiently dispersed and dissolved to form a paste-like fertilizer, but coarse crystals precipitated during storage and solid-liquid separation occurred. (Comparative Example 3) Table 2

Claims (1)

[Claims] After decomposing yeast with alkali, the pH was adjusted to 5.0 with wet phosphoric acid.
0 to 75, and adding and mixing fertilizer salt thereto.