KR100601083B1 - Method of preparing porous soil modifier with good permeability - Google Patents

Abstract

The present invention relates to a method for producing a soil improving material that neutralizes acidified soil using basic converter slag powder generated in a steelmaking process of an ironworks. It is to manufacture soil improving material with continuous soil neutralizing effect. To this end, in the present invention, 20-50% by weight of the fine converter slag extracted from now, 15-60% by weight of fibrous organic matter, 20-50% by weight of clay, and then molded into a size of 1-2 mm and then 400- Firing at 600 ° C for 30 minutes-1 hour to produce a soil permeability excellent water permeability.

Soil improvement material, steelmaking slag, fibrous organic matter, firing

Description

Method for manufacturing soil improver with excellent permeability {METHOD OF PREPARING POROUS SOIL MODIFIER WITH GOOD PERMEABILITY}

[Industrial use]

The present invention relates to a soil improver capable of rapidly neutralizing the severely acidified soil to restore the fertility of the soil, and more particularly, to fine fine steel slag, clay, and fibrous organic matter generated in the process of extracting now from steelmaking slag. The present invention relates to a method for producing a soil improver having excellent water permeability.

[Prior art]

In the steelmaking process, basic slag for removing impurities in molten steel is generated as a by-product. The main components of the slag are calcium oxide and magnesium oxide. In addition, a significant amount of free calcium oxide is included, showing a high basicity. Steelmaking slag has high mechanical strength and low chemical strength, and most steelmaking slag after extraction is now simply buried. In addition, fine steelmaking slag generated in the process of crushing steelmaking slag for extraction now is difficult to process.

The use of steelmaking slag includes the addition of silicate ore, glass dust, coal ash and the like to prepare a washed slag having a small amount of calcium oxide, calcium hydroxide and sodium hydroxide (Japanese Patent Application Laid-Open No. 61-021794). This method is not applicable to fine slag after extraction.

The present invention has been made to solve the above-mentioned problems, the object of which is to recycle the fine steelmaking slag now extracted.

Another object of the present invention is to use a fine steelmaking slag, to produce a soil improving material having a rapid and continuous soil neutralization effect.

In order to achieve the above object, in the present invention, 20-50% by weight of steelmaking slag, 20-50% by weight of clay, and 15-60% by weight of fibrous organic matter are mixed, and the mixture is molded into 1-2 mm, and then a molded article. By firing at 400-600 ° C, a soil improver having excellent water permeability is produced.

Hereinafter, a method for producing a soil improver having excellent water permeability according to the present invention will be described in more detail.

In the present invention, using the steelmaking slag, clay and fibrous organic material to produce a soil improving material, fine steelmaking slag powder is used for a rapid soil neutralization effect, using the clay, steelmaking slag particles are not properly scattered and placed in the soil The carbonaceous and pores produced by the fibrous organic matter ensure the habitat and beneficial breathability and water permeability of the soil microorganisms.

In order to manufacture the soil improver according to the present invention, first, 20-50% by weight of fine steelmaking slag generated in the process of crushing steelmaking slag for extraction and 15-60% by weight of fibrous organic matter 20-50% by weight of clay Mix with%.

The mixed raw materials are molded into a size of 1-2 mm and calcined in an oxidizing atmosphere or air at a temperature of 400-600 ° C. to prepare a soil improver.

Herein, the fibrous organic material refers to an organic material that is completely burned in an oxidizing atmosphere of 400 ° C. or higher or has a carbon yield of 50% by weight or less, such as rice straw, polyethylene tube, wood chips, and coconut fiber.

These fibrous organics play a role of enhancing the molding strength in the manufacture of soil-improving materials and providing carbonaceous material, a pore that is a path through which water and air flow smoothly after firing, and a habitat for beneficial soil microorganisms.

Therefore, any organic material that is completely burned after carbonization or carbonized leaving only carbonaceous material may be used, but it is advantageous to have a fibrous shape as much as possible to ensure permeability. In addition, it should not contain heavy metals harmful to the soil.

Clay binds fine steel slag so that it does not scatter and provides the function of controlling the elution rate of steel slag. In addition, it has excellent moldability and best compatibility with soil when fertilized after firing.

Steel slag can be adjusted in the amount of 20-50% by weight and clay in the range of 20-50% by weight. If the steelmaking slag is less than 20% by weight, it is difficult to expect a long-term neutralization effect. If the steelmaking slag is more than 50% by weight, it is disadvantageous in decreasing moldability and lowering strength after firing.

The amount of clay can be appropriately adjusted according to the amount and formability of steelmaking slag. However, when the amount of clay is less than 20% by weight, moldability is extremely poor, and when the amount of clay is more than 50% by weight, the effect of the desired soil improving material is lowered.

The remainder of the combined amount of steelmaking slag and clay is the amount of fibrous organic matter. In other words, in the case of 50% by weight of steelmaking slag and 30% by weight of clay, the amount of fibrous organic matter is determined as 20% by weight.

However, depending on the carbonization behavior of the fibrous organics used, first, the amount of fibrous organics used may be determined, and accordingly, the amount of steelmaking slag and clay may be determined. In any case, the percentage of each raw material used should be within the above weight percent range to ensure optimum soil improvement.

Molding is preferably 1-2 mm in size, since less than 1 mm may cause scattering, and if it exceeds 2 mm, it will be incompatible with soil.

Firing is carried out for the purpose of strengthening strength and decomposing organic matters, and lowering of plastic strength and incomplete carbonization are problems at temperatures below 400 ° C., and manufacturing costs are unnecessarily high at temperatures above 600 ° C., therefore, firing temperatures are 400-600 ° C. Is preferably.

In addition, the firing time is related to the firing temperature, the higher the firing temperature, the shorter the firing time. However, when the firing time is less than 30 minutes, the plastic strength is low and fine powder may be scattered again, and when it is more than 1 hour, the manufacturing time becomes long and the manufacturing cost becomes high.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Examples 1 to 3

Steelmaking slag, clay and finely crushed rice straw were mixed, molded and calcined at the same ratio as in Table 1 (Example 1), Table 2 (Example 2) and Table 3 (Example 3) below to prepare a soil improving agent. .

The prepared soil modifier was mixed with 10% by weight in extremely acidified soil with soil acidity 4.0, and distilled water corresponding to 10% by weight of the mixture was added and mixed again. The soil acidity measured after 12 hours while mixing again every hour to simulate the permeability effect is shown in Table 1, Table 2, Table 3.

Rate (wt%) Temperature (℃) Time (hours) PH (pH) Steel slag clay Straw 20 20 60 400 0.5 5.5 One 6.0 500 0.5 5.4 One 5.2 600 0.5 5.6 One 5.7 20 35 45 400 0.5 5.9 One 4.8 500 0.5 4.9 One 4.3 600 0.5 4.9 One 5.2 20 50 30 400 0.5 5.6 One 5.8 500 0.5 6.1 One 6.2 600 0.5 4.9 One 5.4

Rate (wt%) Temperature (℃) Time (hours) PH (pH) Steel slag clay Straw 35 20 45 400 0.5 7.2 One 6.9 500 0.5 6.7 One 7.1 600 0.5 7.0 One 6.5 35 35 30 400 0.5 6.3 One 6.3 500 0.5 5.5 One 6.5 600 0.5 7.5 One 7.6 35 50 15 400 0.5 6.0 One 6.5 500 0.5 6.8 One 7.0 600 0.5 5.9 One 6.5

Ratio (% by weight) Temperature (℃) Time (hours) PH (pH) Steel slag clay Straw 50 20 30 400 0.5 7.1 One 7.9 500 0.5 7.4 One 7.5 600 0.5 7.8 One 7.6 50 35 15 400 0.5 7.1 One 6.8 500 0.5 7.0 One 7.0 600 0.5 7.9 One 8.5

As shown in Tables 1 to 3, the soil improver prepared according to the present invention was found to neutralize the severely acidified soil in a short time.

As described above, the soil improving agent manufacturing method according to the present invention has the effect of recycling the fine steelmaking slag after extraction.

In addition, the soil improver produced using the fine steelmaking slag according to the present invention neutralizes the acidified soil in a short time and the soil neutralization effect has a continuous effect.

Claims (3)

Mixing 20-50% by weight steelmaking slag, 20-50% by weight clay, and 15-60% by weight fibrous organics; Shaping the mixture to 1-2 mm; And Firing the molded body at 400-600 ° C. Soil improver manufacturing method excellent permeability comprising a. The method of claim 1, The fibrous organic material, A method for producing a soil permeable material having excellent water permeability, including rice straw, polyethylene tube, wood chips, and coconut shell fibers, which are completely burned in an oxidizing atmosphere of 400 ° C. or higher or exhibit a carbon yield of 50% by weight or less. The method according to claim 1 or 2, Firing the molded body, A method for producing a soil improver having excellent permeability for 30 minutes to 1 hour.