KR20150118056A - Manufacturing method of blast furnace slag fertilizer - Google Patents

Abstract

The present invention relates to a method for producing a blast furnace slag fertilizer and, more specifically, to a method for producing a siliceous fertilizer by mixing blast furnace slag and a fertilizer. The method according to the present invention comprises: a first step of producing blast furnace slag into fine powder of 50 μm; a second step of mixing 4 parts by weight of an animal liquefied fertilizer with respect to 1 parts by weight of the blast furnace slag; and a third step of dipping and aging a mixture of the blast furnace slag and animal liquefied fertilizer mixed through the second step. The blast furnace slag comprises 0.07 parts by weight of MgO and 0.81 parts by weight of SiO2 with respect to 1 parts by weight of CaO. The animal liquefied fertilizer is produced by fermenting livestock excrement. In the third step, the mixture of the blast furnace slag and animal liquefied fertilizer is aged for 84 hours at an indoor humidity of 60% and an indoor temperature of 15°C. The fertilizer produced through the third step is molded into a pill or pellet shape of 5 mm to be sprayed onto a paddy or a filed. According to the method of the present invention, through a simple process of mixing blast furnace slag with a fertilizer, a calcareous fertilizer is produced, so the number of topdressing of the fertilizer and an elution speed of the fertilizer can be reduced. Moreover, pH of soil is adjusted to help easy growth of agricultural products, and resistance against harmful insects can be improved by providing silicic acid.

Description

Technical Field [0001] The present invention relates to a blast furnace slag fertilizer,

The present invention relates to a method for producing blast furnace slag fertilizer, and more particularly, to a method for producing silicate fertilizer by blending blast furnace slag and fertilizer.

Silicate fertilizer was poorly applied to farms due to its high price, despite its various advantages such as reduction of rice dropping, improvement of quality, reduction of occurrence of blast fungus, and alkalization of acid soil. Accordingly, various types of silicate fertilizers have been developed and utilized to supply silicate during the rice growing process. In particular, the use of silicate fertilizers has been greatly expanded and generalized since slag, a by-product from steelworks, has been usefully used as silicate fertilizer.

In this regard, the silicate fertilizer composition for reducing the generation of methane gas in the soil and the method for reducing the methane gas generation in the soil using the same are disclosed in Korean Patent No. 10-0829438 However, there is a problem that the treatment process is somewhat complicated and toxicity may be caused when the steel slag used is excessively used in the soil.

Korean Patent Publication No. 10-0829438 (May 07, 2008)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the problems of the prior art as described above, and the blending of the blast furnace slag and the fertilizer simplifies the treatment process, thereby increasing the efficiency and decreasing the dissolution rate of the fertilizer.

The purpose of this study is to control the pH of soils to facilitate the growth of crops and to increase the resistance of pests by supplying silicate.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems to be solved by the present invention, which are not mentioned here, As will be appreciated by those skilled in the art.

The method for producing blast furnace slag according to the present invention comprises a first step of producing a blast furnace slag with a fine powder of 50 mu m, a second step of mixing 4 parts by weight of an animal's liquid ratio with 1 part by weight of the blast furnace slag, Wherein the blast furnace slag comprises 0.07 part by weight of MgO and 0.81 part by weight of SiO _{2 based} on 1 part by weight of CaO, In the third step, a mixture of the blast furnace slag and an animal manure is aged for 84 hours at a room humidity of 60% and a room temperature of 15 DEG C, and the third step The fertilizer is distributed in the form of a pellet or a pellet of 5 mm, and is then sprayed onto paddy field or field.

The method for producing blast furnace slag fertilizer according to the present invention can reduce the number of fertilizer application and reduce the dissolution rate of fertilizer by producing a silicate fertilizer through a simple process of mixing blast furnace slag and fertilizer.

In addition, the pH of the soil can be adjusted to facilitate the growth of crops, and the supply of silicic acid can increase the resistance of pests.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process diagram showing a method for producing blast furnace slag fertilizer according to the present invention. FIG.
Fig. 2 shows the dissolution rate of the fertilizer with respect to time.
FIG. 3 is a graph comparing lengths of plant lengths under various conditions when the fertilizer amount is adjusted to be 90 kg / 10a.
FIG. 4 is a graph comparing lengths of plant lengths under various conditions when the fertilizer amount is adjusted to be 120 kg / 10a.
Fig. 5 is a graph comparing changes in the number of tillers according to each condition when the fertilizer amount was adjusted to be 90 kg / 10a.
FIG. 6 is a graph comparing changes in the number of tillers according to each condition when the fertilizer amount was adjusted to be 120 kg / 10a.
7 is a graph comparing changes in leaf color intensity according to each condition when the fertilizer amount is adjusted to be 90 kg / 10a.
8 is a graph comparing changes in leaf color intensity according to each condition when the fertilizer amount is adjusted to be 120 kg / 10a.
FIG. 9 is a graph comparing changes in rice yield according to each condition when the fertilizer amount was adjusted to be 90 kg / 10a.
FIG. 10 is a graph comparing changes in rice yield according to each condition when the fertilizer amount was adjusted to be 120 kg / 10a.
11 is a graph showing the incidence of paperback disease according to the type of fertilizer to be fertilized.

The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

Hereinafter, a method for producing the above-described blast furnace slag fertilizer will be described with reference to the drawings and examples.

<Production method of blast furnace slag fertilizer>

1 is a flow chart showing a method for producing blast furnace slag fertilizer according to the present invention.

First, in the first step (S1), the blast furnace slag is crushed to prepare a fine powder. Specifically, the particle size of the blast furnace slag powder is pulverized to 30 to 60 micrometers.

This is because when the size of the blast furnace slag powder is less than 30 micrometers, powdery material is lost due to excessive powder scattering, and when the blast furnace slag powder size is more than 60 micrometers, it is not easily dispersed when mixed with fertilizer.

The components of the blast furnace slag satisfy the criteria of the optical silicate fertilizer shown in Table 1 and the sum of the components of CaO and MgO contained in the blast furnace slag is 50% to 70% do. This is to show an excellent effect as a soil improving agent within a range satisfying the specification of silicate fertilizer, and CaO and MgO have an alkaline property in the fertilizer. As a result, it can be usefully used as an agent for improving acidic soil.

sample Availability
CaO (%) Availability
MgO (%) Availability
SiO2 (%) Cr (%) Ni (%) Ti (%) Blast furnace slag 38.4 2.6 31.2 0 0 0.01 Based on silica - 2 or more 15 or more 0.1 or less 0.01 or less 0.04 or less

Next, in the second step (S2), the blast furnace slag pulverized with the fine powder is mixed with the fertilizer.

Specifically, the blast furnace slag pulverized with the fine powder is mixed with the fertilizer at a certain ratio. The fertilizer to be mixed with the blast furnace slag may be at least one of a liquid fertilizer and an animal manure obtained by fermenting livestock manure.

The livestock manure can be used in the form of an animal manure through fermentation, which can be an effective means of utilizing livestock waste.

When the blast furnace slag and the liquid fertilizer are mixed, the blended amount of the blast furnace slag and the above-mentioned fertilizer is mixed so as to be 0.2 to 0.5 parts by weight of the liquid fertilizer to 1 part by weight of the blast furnace slag.

When the blast furnace slag and the animal manure produced by fermenting the animal manure are mixed, 1 to 2 parts by weight of the blast furnace slag is mixed with 2 to 6 parts by weight of the animal manure produced by fermenting the animal manure.

This is for mixing the nitrogen content contained in the fertilizer with 0.02 to 0.05 part by weight per 1 part by weight of the blast furnace slag.

The amount of nitrogen contained in the liquid fertilizer is generally about 9%, and the amount of nitrogen contained in the animal manure produced by fermenting the animal manure is about 0.2 to 0.3%.

When the amount of nitrogen contained in the fertilizer is less than 0.02 parts by weight with respect to 1 part by weight of the blast furnace slag, nutrients required for synthesis of proteins, nucleic acids, and the like are insufficient, so that growth is not smooth. If the amount of nitrogen is more than 0.05 part by weight, abnormal growth may occur, which may lead to problems in environmental aspects such as soil acidification or water pollution. Therefore, it is preferable to mix them at the mixing ratio.

Next, in the third step (S3), the blast furnace slag and the fertilizer are mixed and then immersed. This is to reduce the rate of dissolution of the fertilizer and to adjust the amount of nitrogen required for crop growth.

Specifically, the blast furnace slag and the fertilizer are mixed and dipped for 72 to 96 hours. At this time, the immersion is performed by mixing the blast furnace slag in the form of powder with the above-mentioned fertilizer and aging for a long period of time. When immersing for 72 hours or more for a long time, a large amount of water is evaporated, The fertilizer is infiltrated and formed into a fertilizer in the form of clay. As a result, the concentration of nitrogen is increased, and it is formed into a slow-acting fertilizer in which the constituents of the fertilizer are gradually eluted, when the formulation is formulated in the form of the following rings or pellets.

Immersion time (days) pH Nitrogen content (%) One 9.31 0.11 2 9.47 0.16 3 9.55 0.18 4 9.63 0.20 5 9.65 0.21

In Table 2, changes in pH and nitrogen amount were measured from the first day to the fifth day after dipping the blast furnace slag at a liquid concentration of 0.2% in order to measure changes in pH and nitrogen amount according to immersion time.

When the immersion time was less than 40 hours, the mixing was not made uniform. When the concentration of nitrogen in the mixture was insufficient and the immersion time exceeded 100 hours, the mixing was completed and the concentration of nitrogen required for the fertilizer was secured As the amount of nitrogen increases over time, the efficiency of the operation is lowered.

Further, at the time of immersion, the substrate is immersed in a room maintained at a humidity of 40 to 80% and a temperature condition of 0 to 25 ° C.

When the humidity of the room is less than 40%, there is a disadvantage in that the viscosity of the water is reduced and the viscosity of the composition is not good. When the moisture content is more than 80%, the moisture content is too high. Also, when the room temperature is lower than 0 ° C, the immersion water is frozen and it is difficult to use. When the temperature exceeds 25 ° C, it is difficult to maintain the room humidity and the nitrogen may be volatilized together with moisture.

2 is a graph comparing the elution amounts of the fertilizer with time after the application of the fertilizer. It can be seen that when the liquid fertilizer is sprayed alone, the amount of elution of the fertilizer changes drastically. However, when the blast furnace slag and the liquid fertilizer are mixed, the elution amount of the fertilizer gently increases and then decreases slowly.

When the fertilizer is aged after being infiltrated into the porous blast-furnace slag powder through the immersion step, the fast-acting fertilizer slowly dissolves after the application of the fertilizer, and becomes an effective fertilizer for the growth of crops.

The blast furnace slag fertilizer produced through the immersion step can be used in the form of pellets or pellets in order to further reduce the dissolution rate of the fertilizer. Specifically, it is preferable to produce a ring having an average size of 2 to 6 millimeters.

If the size of the circle is less than 2 millimeters, it is not easy to reduce the dissolution rate of the fertilizer. If the size of the circle exceeds 6 millimeters, spraying of the fertilizer is not easy.

Further, a chemical fertilizer may be added to the mixture of the blast furnace slag and the fertilizer in consideration of cost and efficiency.

In the present invention, the effects of using the fertilizer produced by the method for producing blast furnace slag fertilizer of the present invention and conventional chemical fertilizer or liquid fertilizer will be described in detail as follows.

The control used in the experiment was as shown in Comparative Example 1 below and 300 kg / 10a of the blast furnace slag generally used. The chemical fertilizer and the blast furnace slag were mixed to show Comparative Example 2 and Comparative Example 3. Experiments of the blast furnace slag fertilizer according to the present invention are shown in Examples 1 and 2.

[Example 1]

In Example 1, 300 kg / 10a of blast furnace slag and 90 kg / 10a of liquid fertilizer according to the present invention were mixed and used in paddy fields.

[Example 2]

In Example 2, 300 kg / 10a of blast furnace slag and 120 kg / 10a of liquid fertilizer according to the present invention were mixed and used in rice paddy.

[Comparative Example 1]

In Comparative Example 1, 300 kg / 10a of a commonly used blast furnace slag was applied to a paddy field.

[Comparative Example 2]

In Comparative Example 2, 300 kg / 10a of blast furnace slag according to the present invention and 90 kg / 10a of custom chemical fertilizer were mixed and used in rice paddy.

[Comparative Example 3]

In Comparative Example 3, 300 kg / 10a of the blast furnace slag according to the present invention and 120 kg / 10a of custom chemical fertilizer were mixed and used in the rice paddy.

In order to examine the effects of the method of manufacturing blast furnace slag fertilizer of the present invention in the above-mentioned Examples and Comparative Examples, the following experiment was conducted and the results are shown in FIG. 2 to FIG.

A. Length of plant length

In the present invention, the lengths of the growth stages of the growth characteristics of rice were compared using the above Examples and Comparative Examples.

FIG. 3 is a schematic diagram showing the comparison of the lengths of plants according to Comparative Example 1, Comparative Example 2, and Example 1. FIG.

Fig. 4 is a schematic diagram comparing lengths of plants according to Comparative Example 1, Comparative Example 3 and Example 2. Fig.

The difference in the length of the plant length between the comparative examples and the examples was not large, but the results of Examples 1 and 2, in which the blast furnace slag and fertilizer were mixed, were somewhat higher than those of Comparative Example 1 . However, this is not recognized as a result of differences in plant length.

The reason for comparing the length of the plant length is that the longer the length of the plant length, the weaker the rice resistance of the rice.

N. Number of tears

In the present invention, the changes in the number of tillers in the growth characteristics of rice were compared using the above Examples and Comparative Examples.

Fig. 5 is a graph comparing the number of tillering of rice according to Comparative Example 1, Comparative Example 2, and Example 1. Fig.

Fig. 6 is a graph comparing the number of tillering of rice with Comparative Example 1, Comparative Example 3 and Example 2. Fig.

As a result of the comparison, the blending number of the blast furnace slag fertilizer according to the present invention tended to increase as time passed after fertilizer application.

The increase in the number of tillers can be a factor for increasing the rice yield, but it is also possible to estimate the possibility that the rice paddies will become more frequent due to poor breathability due to overburden.

C. Leaf color

In the present invention, the changes in leaf brightness among the growth characteristics of rice were compared using the above examples and comparative examples.

FIG. 7 is a graphical representation of comparison of leaf brightness according to Comparative Example 1, Comparative Example 2, and Example 1. FIG.

FIG. 8 is a graphical representation of comparison of leaf brightness according to Comparative Example 1, Comparative Example 3, and Example 2. FIG.

Leaf color was measured at 2/3 point of the top completely developed leaves using a leaf color meter SPAD-502. If the chlorophyll content is kept low, the amount of gold in the rice is increased, which can be solved through the use of nitrogen fertilizer.

7 and 8, it can be seen that the blend of blast furnace slag and fertilizer is higher than that of blast furnace slag and the blast furnace slag is higher than that of blast furnace slag and liquid fertilizer. Can be confirmed.

It can be judged that a sufficient nitrogen amount necessary for rice cultivation can be secured when the blast furnace slag and the fertilizer are mixed.

D. Number of rice

In the present invention, the yields of rice were compared using the above examples and comparative examples.

FIG. 9 is a graphical illustration comparing the rice yields of Comparative Example 1, Comparative Example 2 and Example 1. FIG.

Fig. 10 is a schematic diagram comparing the rice yields of Comparative Example 1, Comparative Example 3 and Example 2. Fig.

Comparative Example 1 of Comparative Example 1 of FIG. 9 showed a rice yield of about 450 kg / 10a, Comparative Example 2 showed a rice yield of about 520 kg / 10a of Example 1, Comparative Example 1 of Comparative Example 1 showed a yield of about 480 kg / Showed a rice yield of about 520 kg / 10a.

In both FIG. 9 and FIG. 10, the rice yield was higher than that of Comparative Example 1 (control) by the method of the examples, which is considered to be helpful for increasing rice yield.

ㅁ. The incidence of paperback

In the present invention, the incidence of rice paddy disease was compared using the above Examples and Comparative Examples.

The above-mentioned paperback disease, also called sheath blight, occurs when the air temperature is high and the number of tears is high and the ventilation is not smooth in the summer, and it is a bottle infringing on the sheath, leaf blade, and acupuncture tree and has a round gray or dark gray circular or irregular pattern. Later, it becomes a grayish white color, and it is a bottle that is dried up from the lower leaves.

As shown in FIG. 11, the release rate of the paperback disease was about 68% or more in the case of using the Comparative Example 1, and the incidence was about 60% in the case of using the Example.

 As shown in FIG. 5 and FIG. 6, it was expected that the number of tillers in the rice cultivation was increased to increase the probability of developing a paperback disease. However, since the incidence was low, the increase in rice yield and the suppression of the disease It is thought that it can come.

Therefore, it was confirmed that when blast furnace slag was mixed with liquid fertilizer, the growth characteristics and production amount of rice were increased, but the incidence of paperback disease was decreased as compared with the case of using chemical fertilizer or liquid fertilizer alone.

As described above, it is to be understood that the technical structure of the present invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention.

Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, All changes or modifications that come within the scope of the equivalent concept are to be construed as being included within the scope of the present invention.

S1: Blast furnace slag powder production step
S2: Blast furnace slag and fertilizer mixing step
S3: mixture immersion step

Claims (1)

A first step of producing blast furnace slag as fine powder of 50 탆;
A second step of mixing 4 parts by weight of animal litter with 1 part by weight of the blast furnace slag;
And a third step of immersing and mixing the mixture of the blast furnace slag and the animal slurry mixed in the second step,
The blast furnace slag comprises 0.07 part by weight of MgO and 0.81 part by weight of SiO _{2 based} on 1 part by weight of CaO,
The animal manure is prepared by fermenting an animal manure,
In the third step, the blend of blast furnace slag and animal litter was aged for 84 hours at a room humidity of 60% and an indoor temperature of 15 ° C,
Wherein the fertilizer produced through the third step is sprayed in a rice field or a field after being formulated in the form of a 5 mm ring or pellet.

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