JP6548882B2 - Method for producing hardened body for eluting nutrient components in water - Google Patents

Description

  The present invention relates to granules for nutrition.

In recent years, a phenomenon called so-called scorching has been identified in which seaweeds in the sea decrease in various parts of the coastal waters of Japan. Skewers are responsible for the deterioration of the marine environment such as loss of fish and shellfish housing places and spawning grounds, loss of food and the like, as well as the reduction of fish catch due to the deterioration. Causes of scorching include rising sea water temperature, decreasing nutrient components supplied from rivers, and feeding damage by algae-feeding animals such as sea urchins.
As a method for improving scorching, for example, Patent Document 1 discloses a porous cement-hardened cement composition containing a surface-coated granular fertilizer and / or a porous powder impregnated with a fertilizer component. A method has been proposed for placing the body in the water.

Unexamined-Japanese-Patent No. 2000-335986

The porous cement-hardened body described in Patent Document 1 uses a porous granular material impregnated with a surface-coated granular granular fertilizer or a fertilizer component in order to incorporate a fertilizer component into a cement composition. There is. Here, in order to produce a porous granular material impregnated with a fertilizer component, it is necessary to immerse the porous granular material in a solution in which the fertilizer component is dispersed or dissolved. However, when the concentration of the fertilizer component increases, the viscosity of the solution increases, so the amount of impregnation of the fertilizer component into the porous powder decreases, and the elution amount of the nutrient component when using the produced porous powder Or there is a problem that the impregnation time becomes longer in order to fully impregnate the fertilizer component.
An object of the present invention is to provide a granule for nutrient supply which can increase the elution amount of a nutrient component.

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining in order to solve the said subject, the inventor of this invention is based on the granule for nutrient supply which consists of a specific core body and the specific coating layer coat | covered on the surface of this core body. The present invention has been accomplished by finding that the object of the invention can be achieved.
That is, the present invention provides the following [1] to [5].
[1] It is characterized by comprising a core body obtained by impregnating a liquid substance containing a nutrient component and water into a water-absorbent granular body, and a coating layer consisting of a hydraulic composition coated on the surface of the core body. Nutritional granules used.
[2] The nutrition supplying granules according to the above [1], wherein the granules are granules formed by using powder as a material.
[3] The grain for nutrition supply according to the above [1] or [2], wherein the particle size of the core body is 0.1 to 50 mm, and the thickness of the coating layer is 0.1 to 10 mm. .
[4] The nutrition supplying granules according to any one of the above [1] to [3], wherein the material of the granules is an inorganic or organic porous material.
[5] The nutrition supplying granules according to any one of the above [1] to [4], wherein the hydraulic composition contains cement or gypsum.

According to the granules for nutrition supply of the present invention, it is possible to increase the elution amount of the nutrition component.
Further, in the present invention, when the granulated material using powder as a material is used as a water-absorbent granular material, the nutrient component can be impregnated into the water-absorbent granular material in a short time. The production efficiency of the granules for nutrition of the present invention can be enhanced.

It is sectional drawing which shows typically the state which cut | disconnected the granule for nutritions of this invention by the surface which passes the center.

Hereinafter, the granules for nutrition supply of the present invention will be described in detail with reference to FIG.
The granule for nutrition 1 of the present invention comprises a core body 2 obtained by impregnating a liquid substance containing a nutrient component and water into a water-absorbent granular body, and a hydraulic composition coated on the surface of the core body 2 And the covering layer 3 consisting of
The said nutrient component means the component required in order to grow a plant. Specifically, main components of inorganic fertilizers such as nitrogen, phosphorus, potassium, magnesium, silicon and sulfur; trace components of inorganic fertilizers such as iron, copper, zinc, nickel, manganese, cobalt and molybdenum; amino acids, proteins And organic fertilizer components such as
The nutrient components may be used alone or in combination of two or more. In the present invention, it is preferable to use two or more in combination.

  The liquid containing the nutritional component and water is a liquid (aqueous solution or suspension) obtained by appropriately adjusting the composition of the nutritional component and water described above according to the application. As the liquid, it is also possible to use the juice etc. discharged in the food processing industry or the fishery processing industry.

As the above-mentioned water-absorbent granular material, any material which can impregnate the above-mentioned liquid can be used, and any of inorganic and organic materials can be used. Further, from the viewpoint of increasing the amount of impregnation of the liquid material and shortening the time required for the impregnation, a porous material (hereinafter also referred to as "porous material") is preferable.
Examples of inorganic materials include shale, pumice, volcanic zeolite, diatomaceous earth, shirasu, vermiculite, calcium carbonate-containing substances (such as limestone, shells, eggshells of eggs) and the like, calcined products of these, pearlite and obsidian, Fired products obtained by firing and foaming; crushed products such as bricks and ceramics.
Examples of the organic material include foams of synthetic resins such as polyurethane, polyethylene, polystyrene, polyvinyl chloride, polyvinyl alcohol and the like; natural and artificial rubbers; crushed materials of wood materials and the like.
The type of wood in the above woody material is not particularly limited. Further, as wood materials, sawdust generated at the time of cutting of wood, scraps generated at the time of making plywood, construction scraps, crushed materials such as wood generated at thinning or the like can be used.

  The above-mentioned granular material may be used without adjusting the particle size, and may be adjusted and used so that the particle size falls within a specific range according to the purpose. The particle size varies depending on the shape of the granular material, but is preferably 20 mm or less, from the viewpoint of ease of granulation to be described later and in view of sufficiently immersing the liquid in the granular material when performing impregnation. More preferably, it is 10 mm or less, and particularly preferably 5 mm or less.

The core body 2 used by this invention can be obtained by impregnating the said granular material with the liquid substance containing a nutrient component and water.
As a method of impregnating the granular material with a liquid containing a nutrient component and water, there is a method of immersing the granular in the liquid for a fixed time, or a method of kneading the liquid and the granular using a mixer Etc. Among them, a method of kneading using a mixer is preferable from the viewpoint of sufficiently immersing the liquid material in a short time.
The mixer is not particularly limited, and a mixer generally used for mixing powders (for example, a mixer used for mixing mortar and concrete) may be used.
Specifically, vertical mixers, horizontal mixers, Nauta mixers, tilt cylinder mixers, forced mixers, twin-screw mixers and the like can be mentioned. Examples of the vertical mixer include "Hobart mixer" manufactured by Hobart, "Henschel mixer" manufactured by Henschel, and the like. Examples of the horizontal mixer include "Ledige mixer" manufactured by Ledige.
Alternatively, the above-mentioned granular material and the above-mentioned liquid material may be introduced into a container such as a pail and the resulting mixture may be kneaded and impregnated using a hand mixer or the like.
Although the compounding amount of the liquid substance varies depending on the solid content concentration of the liquid substance, it is easy to granulate the granular substance after impregnation, and from the viewpoint that the core body 2 after granulation is not disintegrated, Preferably it is 10-400 mass parts with respect to 100 mass parts of granular materials, More preferably, it is 50-300 mass parts.

Although the granular material impregnated with the nutritional component may be used as it is as the core body 2 in the present invention, from the viewpoint of obtaining the nutrient supply granules 1 sufficiently impregnated with the nutritional component, powder as the above-mentioned granular material It is preferable to use as the core body 2 a granulated product using a body as a material. In addition, the material and the impregnation method of the said powder are the same as that of the above-mentioned granular material.
As a method of manufacturing the said granulated material, various granulation methods, such as rolling granulation, stirring granulation, compression granulation, extrusion granulation, can be used. Moreover, as an apparatus used for granulation, a pan pelletizer, a mixer, a disc pelleter etc. can be used.
Moreover, when performing granulation, you may add a binder as needed.
The particle size of the granulated product is preferably 0.1 to 50 mm, more preferably 0.5 to 20 mm, and particularly preferably 1 to 15 mm. If the particle size is 0.1 mm or more, the amount of impregnation of the nutrient components into the nutrient granules can be increased. If the particle size is 50 mm or less, granulation is facilitated.

By coating the core body 2 with a hydraulic composition, the granules 1 for nutrition of the present invention can be obtained.
As said hydraulic composition, the material of an inorganic type is preferable, for example, cement, gypsum etc. are mentioned. As the cement, various portland cements defined in JIS such as ordinary portland cement, early strength portland cement, moderate heat portland cement, low temperature portland cement, etc .; mixed cement such as blast furnace cement, fly ash cement, slag cement; eco-cement And special cements such as alumina cement.
Among them, ordinary portland cement and early-strength Portland cement are preferable in terms of versatility.
One of these may be used alone, or two or more of these may be used in combination.
Also, if necessary, admixtures such as limestone fine powder, silica fume, fly ash, blast furnace slag, calcium aluminate, dolomite; fibers made of vinylon, polyethylene, polystyrene, polypropylene, carbon, glass, iron etc. May be
Moreover, you may use a fine aggregate etc. in the range which does not affect the property of coating | cover.

In the above hydraulic composition, a hardening accelerator, a setting retarder, a shrinkage reducing agent, an AE agent, a water reducing agent, which is generally used for cement or concrete as a material for adjusting the hardening property. Additives such as high performance water reducing agents, fluidizing agents, thickeners, antifoaming agents and the like may be used within limits not affecting the properties of the coating.
One of these may be used alone, or two or more of these may be used in combination.

As a method of coating the core body 2 with the above-mentioned hydraulic composition, (i) the core body 2 is put into a coating apparatus, and while the apparatus is rotated, the hydraulic composition and water are introduced and coated (Ii) A method of charging the core body 2 into a coating apparatus and charging a slurry prepared by mixing the hydraulic composition and water in advance into a coating apparatus while rotating the apparatus (iii) A hydraulic composition The method of throwing in the core body 2 and throwing in water further, etc. is mentioned, throwing in a coating apparatus and rotating this apparatus.
Among them, the method (i) is preferable from the viewpoint of ease of operation.
As said coating apparatus, a pan coating apparatus, a rolling coating apparatus, etc. are mentioned. Among them, a pan coating apparatus is preferable from the viewpoint of working efficiency.
The thickness of the coating layer 3 made of the hydraulic composition is preferably 0.1 to 10 mm, more preferably 0.3 to 6 mm, and particularly preferably 0.4 to 4 mm. If the said thickness is in the said numerical range, the elution amount of the nutrient component from the granule for nutrition can be made into a suitable quantity.

By coating the core body 2 with a hydraulic composition and then sufficiently curing the hydraulic composition, the granules 1 for nutrition of the present invention can be obtained.
Although the granules for nutrition supply of the present invention can be used alone, they can also be used as a substitute for aggregate in hydraulic compositions such as concrete and mortar.
When the granules for nutrition of the present invention are used as a substitute for coarse aggregate, the blending ratio is preferably 5 to 5 parts of the total volume of the coarse aggregate (including granules for nutrition which is a substitute). It is 30% by volume, more preferably 10 to 25% by volume.
Hardened bodies such as concrete and mortar containing the granules for nutrition of the present invention can elute nutrient components in water, similarly to the granules for nutrition.
By leaving the granules for nutrient supply of the present invention or the cured product containing the granules in water (for example, in the sea) etc., the nutrient components are eluted from the granules, and this nutrient component It is a source of nutrition for The granules for nutrient supply of the present invention can increase the elution amount of the nutritional component because the content of the nutritional component is large. In addition, nutrient components can be eluted over a long period of time.

EXAMPLES Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited to these examples.
Example 1
The wood waste generated in the wood processing plant was crushed to a particle size of 3 mm or less using a biaxial crusher to obtain a powder (denoted in Table 1 as "grind of wood waste"). 5 kg of the obtained powder and 15 kg of a soluble protein aqueous solution generated as a nutrient component in a fish meal factory were mixed for 5 minutes using a Lodige mixer to impregnate the powder with a nutrient component.
After the powder after impregnation is granulated into powder particles having a large particle size using a pan pelletizer having a diameter of 1 m, the mass of the obtained granulated product (the powder particles after impregnation of the nutritional component) Mass) was measured. In addition, the mass of the powder before impregnating a nutrient component was measured previously.
The impregnation rate (mass%) of the soluble was calculated using the following formula (1).
Soluble impregnation rate (mass%) = {(mass of granular material after impregnation) − (mass of powder before impregnation)} / (mass of powder before impregnation) (1)
Next, the impregnated powder particles (granulated product) were sieved to obtain a core body (granulated product using powder as a material) having a particle size of 5 to 10 mm.
The core body is placed in a small pan pelletizer having a diameter of 30 cm, and the core body is coated by rotating the small pan pelletizer while appropriately adding ordinary Portland cement (manufactured by Pacific Cement Co., Ltd.) and water. Prepared granules for nutrient supply having a diameter of 6 to 16 mm.
In addition, the compounding quantity of normal portland cement was 200 mass parts with respect to 100 mass parts of core bodies, and the compounding quantity of water was 25 mass parts.
Moreover, when the granule for nutrient supply was cut | disconnected in terms of passing through the center, and the thickness of the coating layer was measured, it was 0.5-3 mm.

The elution amount of the nutrient component from the obtained granules for nutrient supply was measured according to "JIS K 0058-1 2005 (Chemical substance test method for slags-Part 1: elution amount test method)".
Specifically, 500 g of the obtained granules for nutrient supply were put into 5,000 g of pure water contained in a container, and allowed to stand at normal temperature (20 ° C.) for 7 days. After standing, the solution in the container was filtered off with a 0.45 μm membrane filter, and the concentration of organic nitrogen (mg / l) in the solution after filtration was measured using the Kjeldahl method. If the concentration is high, it means that the elution amount of the nutrient component is large.

[ Reference Example 1 ]
The same wood waste as used in Example 1 was crushed using a biaxial crusher until the particle size became 25 mm or less. Thereafter, the crushed wood waste was sieved to obtain a granular body having a particle diameter of 15 to 25 mm (in FIG. 1, indicated as "rough wood chip"). After mixing 5 kg of the obtained granules with 15 kg of the same solvable as used in Example 1, the granules were allowed to stand for 24 hours to impregnate the granules into the nutritional component.
The mass of the granular body before the impregnation and the mass of the granular body after the impregnation were measured, and the impregnation rate of the soluble was calculated using the following formula (2).
Soluble impregnation rate (% by mass) = {(mass of granular body after impregnation) − (mass of granular body before impregnation)} / (mass of granular body before impregnation) (2)
The core body was coated in the same manner as in Example 1 except that the impregnated granular body was used as the core body, to obtain a nutrient supply granular body having a particle size of 20 to 30 mm. The thickness of the coating layer of the obtained granules for nutrition was 0.5 to 5 mm.
Further, the concentration of organic nitrogen, which indicates the size of the elution amount of the nutrient component from the obtained granules for nutrient supply, was measured in the same manner as in Example 1.

Comparative Example 1
Nutritional supply having a particle size of 10 to 25 mm in the same manner as in Example 2 except that a coarse aggregate for concrete having a particle size of 5 to 20 mm (crushed stone 2005 from Sakuragawa City, Ibaraki Prefecture) is used as the granular material. Granules were obtained. The thickness of the coating layer of the obtained granules for nutrition was 0.5 to 5 mm.
The mass of the granular body before impregnation and the mass of the granular body after impregnation were measured, and the impregnation rate of the soluble was calculated using the above-mentioned equation (2). Further, the concentration of organic nitrogen, which indicates the size of the elution amount of the nutrient component from the obtained granules for nutrient supply, was measured in the same manner as in Example 1.
The results are shown in Table 1.

From Table 1, the granules for nutrient supply of the present invention (Example 1 , Reference Example 1 ) have a larger impregnation rate of the soluble than the comparative example 1. In particular, since the impregnation rate of the soluble is larger in Example 1 than in Reference Example 1 and Comparative Example 1, it can be understood that the amount of the nutritional component in the granules for nutrition supply is large.
Furthermore, from Table 1, since the nutrient supply granules (Example 1 , Reference Example 1 ) of the present invention had a large concentration of organic nitrogen in the solution compared with Comparative Example 1, it was determined from the granules for nutrition provision. It can be seen that the elution amount of the nutrient components of

[Examples 3 to 4]
(A) Materials Used The materials shown below were used as materials used.
(1) Coarse aggregate: Crushed stone from Sakuragawa city, Ibaraki prefecture 2005
(2) Fine aggregate: Sand from Kakegawa City, Shizuoka Prefecture (3) Cement: Ordinary portland cement (manufactured by Pacific Cement Co., Ltd.)
(4) High-performance AE water reducing agent: manufactured by BASF Japan Ltd., trade name "Mastergrenium SP8 SV"
(5) Air amount regulator: BASF Japan Ltd., trade name "Master Air 404"
(6) Granules for nutrition supply: those manufactured in Example 1

(B) Preparation and Evaluation of Concrete Specimen The above materials were mixed using the pan-type forced mixer with the formulations shown in Table 2 to prepare concrete. The concrete was cast in a formwork, decasted one day after casting, and then cured in water to prepare a concrete sample of φ10 × 20 cm. The compressive strength of each specimen at material ages of 3 days, 7 days, and 28 days was measured according to "JIS A 1108 (Test method for compressive strength of concrete)".
In addition, using a 7-day-old concrete specimen, the elution amount of the nutrient component from the concrete specimen conformed to "JSCE-G 575 2005 (Measures for Dissolution of Trace Component from Hardened Concrete)". Measured.
Specifically, a concrete sample is placed in a container containing pure water in an amount (3.925 liters) of 5 ml per 100 mm ² of the surface area of the concrete sample and allowed to stand for 7 days at normal temperature (20 ° C.) did. After standing, the solution in the container was filtered off with a 0.45 μm membrane filter, and the concentration of organic nitrogen (mg / l) in the solution after filtration was measured using the Kjeldahl method.
In addition, the concrete in Example 3 is a thing in which 10 volume% of the coarse aggregates used for normal concrete was substituted by the granule for nutrition supply unlike the normal concrete (comparative example 2). Moreover, the concrete in Example 4 is a thing by which 20 volume% of the coarse aggregate used for normal concrete was substituted by the granule for nutrient supply.

Comparative Example 2
A concrete sample was produced in the same manner as in Example 3 except that the concrete obtained by kneading the above-mentioned materials in the composition shown in Table 2 was used.
The compressive strength and the elution amount of the nutrient component of the obtained concrete specimen were measured in the same manner as in Example 3.
The results are shown in Table 3.

From Table 3, in the concrete using the granules for nutrition supply of the present invention as a part of the coarse aggregate, the concentration of organic nitrogen in the solution is large, and the nutrient components are eluted from the granules for nutrition supply, It turned out that it could be used as a source of nutritional ingredients.
Moreover, although the concrete which used the granules for nutrition supply of the present invention as a part of coarse aggregate has strength development property of the initial stage (3 days of material age) of concrete is low, the strength increases with age. It turned out that it can be used without problems as concrete.

1 Granule for nutrition supply 2 Core body 3 Coating layer

Claims (3)

A liquid containing nutrients and water, after which water can particle size was impregnated with wood chips pulverized product is less than 3 mm, and granulating the wood chips ground product, a particle size of 5 ~ 10 mm core A coating layer having a thickness of 0.5 to 3 mm comprising the hydraulic composition coated on the surface of the core body by coating the surface of the core body with the hydraulic composition; Forming a nutrient supply granule comprising the core body and the covering layer ;
Using the granules for nutrient supply as a part of the coarse aggregate to obtain concrete, and then hardening the concrete to obtain a hardened body of the concrete;
The manufacturing method of the hardening body for eluting nutrient components in water characterized by comprising . The hydraulic composition, method for producing a cured product according to claim 1 comprising a cement or gypsum. The hardened body contains, as a coarse aggregate, the granules for nutrition and the coarse aggregate other than the granules for nutrition, and the granules for nutrition and the granules for nutrition The method for producing a cured product according to claim 1 or 2 , wherein the proportion of the nutrition supplying granules in the total amount of coarse aggregates other than the body is 5 to 30% by volume.

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