JPS61197491A - Granular fertilizer composition - 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 granular fertilizer composition with improved caking and floating properties. Granular fertilizers are generally made by mixing phosphate rock with at least one of sulfuric acid, phosphoric acid and nitric acid. A muddy slurry obtained by neutralizing this with ammonia and/or a slurry-like product obtained by neutralizing phosphoric acid, sulfuric acid, nitric acid, etc. with ammonia, and ammonium sulfate, ammonium nitrate, potassium chloride. The raw material solid fertilizer material such as potassium sulfate is mixed and granulated by a known method such as a transfer granulation system. Granulation methods utilizing heat, water and/or steam metal are also known. The remaining product after separating the product size particles from the granulated product by sieving is returned to the granulation system as a so-called circulating amount.

The granular fertilizer thus obtained has two major quality problems.

The first problem is that it is prone to caking, which often causes difficulties in handling. The cause of caking in granular fertilizers is generally thought to be due to crystals that precipitate from the saturated solution that forms between adjacent particles due to moisture absorption and become bridges between each particle when atmospheric conditions change. Talc is used as a method to prevent caking of conventional granular fertilizers.

Mineral powders such as activated clay and diatoms are added to granular fertilizers at a rate of 0.
A commonly used method is to add 5 to 1% by weight and coat the fertilizer particles to prevent contact between the fertilizer particles.However, in the method using these anti-caking agents, the prevention of caking Immediately after adding the fertilizer and coating, the anti-caking effect is sufficiently achieved, but as time passes, the anti-caking agent gradually peels off from the surface of the fertilizer grains, and as a result, caking occurs during long-term storage. The disadvantage is that it increases.

The second problem is that when granular fertilizer is applied to paddy fields, fertilizer particles and/or fertilizer granules often float near the water surface, causing concentration disturbances to crops due to fertilizer component runoff and floating phenomenon. That's true. The reason why granular fertilizer floats when applied to paddy fields is due to the porosity of the fertilizer particles and the content of water-insoluble components. It is known that the denser the material and the more water-insoluble components it has, the more difficult it is to float. Therefore, diatomaceous earth, talc, and bentonite have been used as conventional methods to prevent granular fertilizers from floating to the water surface.

Water-insoluble minerals such as olivine sand are added to fertilizer particles from 3 to 30%.
A commonly used method is to increase the amount of water-insoluble components in fertilizer particles by adding 7% by weight. However, the method of using these antiflotation agents has the disadvantage that a relatively large amount of antifloatation agent is required, resulting in a decrease in fertilizer components. As a method to improve these two disadvantages, 1972-
Example 1 of No. 16862 describes adding an antiflotation agent, polyvinyl alcohol powder, and an anticaking agent diatomaceous earth after drying the fertilizer, but such treatment means only add powder to the surface of the fertilizer grains. However, as time passes, these powders tend to gradually peel off from the surface of the fertilizer grains, and the caking and flotation phenomena tend to increase during long-term storage. Kaisho 52
Example 1 of No. 16862 describes adding a 15% by weight aqueous polyvinyl alcohol solution to the fertilizer before drying, and then adding diatomaceous earth as an anti-caking agent after drying. Although prevention of flotation is achieved, diatomaceous earth is not added to the surface of the dried fertilizer grains, and as a result, diatomaceous earth gradually peels off from the surface of the fertilizer grains over time and hardens during long-term storage. There is a tendency for the caking phenomenon to increase.0 Although several methods have been proposed to improve the caking and floating properties of granular fertilizers, no satisfactory method has yet been found. .

The present inventors conducted various tests in order to improve the quality problems of granular fertilizers in conventional methods.
It has been found that these problems can be solved at once by adding triethylene glycol)v and mineral powder to granular fertilizer in combination.

That is, the present invention provides 0.1 to 5 weight i for granular fertilizer.
% of triethylene glycol-y and 0.1 to 3% by weight of mineral powder.

The granular fertilizers targeted by the present invention are urea and ammonium nitrate.

Nitrogen and phosphorus compounds such as Beian, Salt Ammonium, and Ureaform.

The two components of nitrogen-phosphoric acid, nitrogen-potassium, and phosphoric acid-potassium found in combinations of acidic fertilizer materials such as lime perphosphate and potassium chloride, potassium sulfate, etc. It is a granular fertilizer containing an eight-component system, nitrogen, phosphoric acid, and potassium, or these containing elements necessary for plant growth, such as magnesium, boron, and manganese.

The triethylene glycol used in the present invention does not need to be pure, and commercially available industrial products are sufficient. ◇ If the amount of triethylene glycol added is too low, the effect of preventing surfacing on the water surface will be insufficient. Also, if the amount is too high, no significant improvement in the effect of preventing floating on the water surface can be expected, and this is not only economically disadvantageous, but also causes a decrease in the fertilizer components, so it is usually 0.00% for granular fertilizer. The method of adding 1 to 5% by weight, preferably 0.3 to 2% by weight is not particularly limited, and any conventional method can be used. Generally, a method is adopted in which granular fertilizer is rolled using a device such as a rotating cylinder or a rotating plate, and triethylene glycol is added and mixed to coat the fertilizer.

The mineral powder used in the present invention is talc.

Examples include kaolin, diatomaceous earth, activated clay, silica sand, bentonite, etc. Among them, talc, kaolin, and diatomaceous earth are preferred.0 If the amount of mineral powder added is too small, the anti-caking effect will be insufficient; If the amount is too large, no significant improvement in the anti-caking effect can be expected.Normally, the amount is 0.1 to 8% by weight, preferably 0.5 to 1% by weight, based on the granular fertilizer.The method of addition is not particularly limited. There is no problem, and conventional means can be used in the same manner as in the case of triethylene glyco-μ.

The granular fertilizer composition treated with additive coating in this way is
The caking property and water surface buoyancy are improved, and the caking phenomenon does not increase during long-term storage.

In the present invention, triethylene glycol and mineral powder may be added in the same order or in any different order.

Among these, it is preferable to add triethylene glycol and then mineral powder in order from the viewpoint of anti-caking effect and anti-floating effect on water surface. Because it captures and retains the added mineral powder well, it prevents contact between fertilizer particles, which is the cause of caking, in a long-term and stable manner, resulting in a sustained caking prevention effect. It is assumed that. The effect of preventing floating on the water surface is that triethylene glycol-μ added to the surface of fertilizer particles gradually penetrates into the voids in the fertilizer particles over time, which causes the particles in the fertilizer particles to float. It is presumed that the porosity is substantially reduced, resulting in an effect of preventing floating on the water surface.

EXAMPLES The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited to these Examples in any way.

In addition, all parts and parts in Examples indicate parts by weight and weight percentages unless otherwise specified. Example 1 Ammonium sulfur based granular fertilizer 18-18-18 (
Blending ratio: 29.8% ammonium phosphate, 39.6% ammonium sulfate
22 g of potassium chloride, 9.1 g of gypsum, and 1 g of triethylene glycol/I/ (industrial commercial product) were added in the proportions shown in Table 1 while rolling the mixture in a dish-type granulator. Then, while rolling this product, talc was added in the proportions shown in Table 1.90 The thus obtained sulfuric acid-based granular fertilizer composition was sealed in a polyethylene bag, and then heated at a temperature of 30°C. Table 1 shows the results of measuring the consolidation strength and water surface flotation rate of each sample after leaving it in a constant temperature and humidity chamber at a humidity of 80 degrees for 8 months.

Table 1 Note: Initial fertilizer content moisture is 1.121.0 Mineral product powder talc is 300 mesh bath product.

Consolidation strength: A cylindrical container made of polyvinyl chloride with an inner diameter of 5 cm and a height of 5 cm, with a stainless steel hook 5 cm long and 8 mm in diameter set up in the center, was filled with 8 of the sample, and After the load was applied, the container was sealed in a polyethylene bag and left in a constant temperature and humidity chamber at a temperature of 40 °C and a humidity of 80 °C for 24 hours, and the pull-out strength (kJ) of a hook placed in the container was measured to estimate the consolidation strength. did. If the pull-out strength is 0.5 kHz or less, there is almost no consolidation.

Water surface surfacing rate; temperature 30 in a 500rr+J beaker
℃.

100 in a container containing 400mJ of water 1 hour after adding granular fertilizer particles and/or Measure the ratio (ch) of powder to the number of grains input. and estimated the surface surfacing rate.

As shown in Table 1, it can be seen that the product to which triethylene glycol and mineral powder of the present invention are added together has extremely superior caking prevention effect and water surface floating prevention effect compared to conventional products.

Example 2 Urea-based granular fertilizer 18-18-18 with a particle size of 1 to 411 m
(Blending ratio: 40Ls of diammonium phosphate, 16Ls of urea.

Ureaform 1O, potassium chloride 30, gypsum 41) lk
Triethylene glycol-μ was added to the flask in the proportion shown in Table 2 while rolling it in a dish-type granulator, and then kaolin was added in the proportion shown in Table 2 while rolling it.

The urea-based granular fertilizer composition thus obtained was sealed in a polyethylene bag, and then left in a constant temperature and humidity tank at a temperature of 80°C and a humidity of 80°C for 3 months.
The consolidation strength and water surface flotation rate were measured using the same method as described in Table 2. The results are shown in Table 2.

(Support) The initial moisture content of the fertilizer is 0.9 cm.

Mineral powder kaolin is a 800 mesh pass product.

Example 8 Ammonium-based granular fertilizer 18-8-16 (with a particle size of 1 to 4 mm)
Blending ratio: diammonium phosphate 18.5%, ammonium nitrate 44.4
%, potassium sulfate 31.3chi9 gypsum 5.8chi) 1kg was rolled in a dish-type granulator, and triethylene glycol-P was added in the proportion shown in Table 3, and then this was rolled. Diatomaceous earth was added in the ratio shown in Table 3.a The ammonium nitrate-based granular fertilizer composition thus obtained was sealed in a polyethylene bag, and then placed in a constant temperature and humidity bath at a temperature of 30°C and a humidity of 80°C. After being left in the water for 3 months, the consolidation strength and water surface flotation rate of each sample were measured in the same manner as described in Example 1. These results are shown in Table 3.

Table 8 Note: The initial moisture content of each fertilizer is 1.02%.

Claims (1)

[Claims] A granular fertilizer composition comprising adding 0.1 to 5% by weight of triethylene glycol and 0.1 to 3% by weight of mineral powder to a granular fertilizer.