JP2011099061A - Acidity alleviation technique using converter slag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such problems that although it has been considered that in an artificial forest typified by a cedar forest or a Japanese cypress forest, forest functions can be restored by reducing the stand density therein through forest maintenance operations such as thinning, and pruning so as to assure an adequate light intensity in the forest, an artificial forest with an excessive planting density is kept at a low light intensity over a long period of time and therefore has a number of sites where the vegetation has not been recovered due to the marked progress of soil acidification; and in a strongly acidic site having special soil such as acidic sulfate soil where the soil pH significantly decreases, the improvement of the soil environment cannot be anticipated as long as the site is left untreated. <P>SOLUTION: An acidity alleviation technique using converter slag includes, in a site to be treated, where the soil has been strongly acid due to a marked decrease in the soil pH, spraying soil dressing prepared by blending converter slag produced in making steel with an organic material or the like to the soil surface of the site to be treated using a vegetation base material-spraying machine to improve the structure of the soil which has been dysfunctional due to the marked decrease in the soil pH. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is a Japanese cedar where the acidification of the soil has progressed due to delays in forest maintenance such as thinning, pruning, etc., and soil nutrients have been washed away. Converter slag and organic matter generated when steel is produced for target sites that are strongly acidic and cause a significant drop in soil pH due to special forests such as cypress artificial forests and acidic sulfate soils. Improve the soil structure where the soil pH has been lowered and malfunctioned by the method of spraying and mixing the soil with the vegetation base sprayer, the method of sowing, and the method of mixing with a hydraulic excavator. That made it possible.

In planted forests represented by cedar and cypress, it has been said that the forest function can be restored by securing the illuminance in the forest by reducing the density of trees by reducing forest density such as thinning and pruning. However, the acidification of the soil has become remarkable due to the long period of time in the planted forests that have been planted overcrowded due to low illumination.
In addition, even in places where the soil pH is significantly lowered due to special soil such as acidic sulfate soil and is strongly acidic, it is not possible to improve the soil environment when left as it is. As a countermeasure, there is a method of acid relaxation using inorganic limestone crushed stone, slag slag, shells, concrete waste, etc. and a history of acid relaxation by providing an acid blocking layer in which organic materials are mixed with alkali materials. .

Invention of JP-A-11-61119 Invention of JP 2000-265470 A Invention of Japanese Patent Laid-Open No. 2000-282034

However, the method of using limestone crushed stone, slag slag, shells, concrete waste, etc., which are inorganic substances of the above-mentioned conventional method alone, for acid mitigation alone, reduces the particle size of alkali minerals in order to mitigate the excessive expression of the effect of acid mitigation. Since the alkaline material alone is used, solidification occurs unless the particle size is increased, and the penetration of soil moisture is significantly deteriorated.
In addition, although an organic material is mixed with an alkaline material to create an acidic barrier layer, the soil of planted trees does not have an acidic buffer function, so the effect of buffered acidic soil cannot be buffered by the barrier layer. The problem is that the planted trees die.

  Therefore, the present invention is an undeveloped forest or acidic sulfate soil and has an environment where the pH is lower than 4.4. Therefore, the cation exchange capacity (CEC), which is the power to have nutrients, is significantly reduced, and harmful substances such as aluminum Sprayed with a vegetation base that is a mixture of bark compost, which is an organic material, and strong alkaline materials, such as converter slag, fertilizer, zeolite, etc. By mixing with a hydraulic excavator, it is possible to create a vegetation base that can relax acidity as well as a soil environment in which plants grow.

  Also, cedar, cypress, etc. that have been unable to maintain public functions such as prevention of sediment runoff due to soil acidification due to delay in forest maintenance such as thinning, pruning, etc. Because of special soils such as artificial forests and acid sulfate soils, converter slag generated when steel is mixed with organic materials for target sites that have become highly acidic soils with a drastic drop in soil pH The purpose is to improve the soil structure where the soil pH is lowered and malfunctioned by spraying the customer soil on the target surface with a vegetation substrate spraying machine.

  The first aspect of the present invention is an acid mitigation method using a converter slag, wherein an acidic mitigation base material is formed by mixing the converter slag with seeds, bark base material, fertilizer, and zeolite so as to mitigate the acidity of the soil. It is possible to recover the structure of acidic soil by leaving the acid mitigation base material by spraying with hydro sprayer or mortar / concrete spraying machine or by human power, mixing with hydraulic excavator and leaving it on the target site It is.

  In the second aspect of the present invention, in the acid mitigation method using the converter slag according to the first invention, vegetation bases such as bark compost, converter slag, fertilizer and zeolite, which are organic materials, are sprayed with hydrocedar or mortar / concrete. A soil is created by mixing in a soil spraying machine such as a machine, and sprayed onto the target site by the soil spraying machine.

  In the third aspect of the present invention, in the acid mitigation method using the converter slag according to the first invention, vegetation bases such as bark compost, converter slag, fertilizer and zeolite, which are organic materials, are seeded on the target surface. Is something to do.

  According to a fourth aspect of the present invention, in the acid mitigation method using the converter slag according to the first invention, an organic material such as bark compost, converter slag, fertilizer, and zeolite is applied to the target surface by a hydraulic excavator. It is intended to perform mixing.

According to a fifth aspect of the present invention, in the acid mitigation method using the converter slag according to the first aspect, bark compost, which is an organic material, has a pH (H ₂ O) of 5.5 to 7.5, electrical conductivity. A material that reduces the acidity of the soil using a material having a pH of 0.9 mS / cm or less, a material having a pH (H ₂ O) of 11.0 or more and a particle diameter φ = 2 to 5 mm is utilized. .

  The sixth aspect of the present invention is the acid relaxation method using the converter slag according to the first aspect of the present invention, wherein the bases such as Ca, Mg, K, etc. occupy the cation exchange capacity using the analysis value of the soil chemistry of the target site. It is intended to make a medium suitable for the plant to be introduced by utilizing the fertilization design corresponding to the amount of excess and deficiency.

  7th of this invention WHEREIN: In the acid mitigation method using the converter slag based on 1st invention, the converter slag as a buffer material which raises the pH of a forest and strongly acidic soil is particle diameter (phi) = 2-5mm. Converter slag is used to make good use of the slag.

  In the eighth aspect of the present invention, in the acid mitigation method using the converter slag according to the first aspect, the fertilizer to be mixed with the customer soil is positively analyzed using the analytical value of the soil chemistry in the strongly acidic target area. Utilization of fertilization design that matches the excess or deficiency of the amount of base such as Ca, Mg, K, etc. in the ion exchange capacity.

  The ninth aspect of the present invention is a cation exchange function that adsorbs bases such as Ca, Mg, and K based on the soil analysis results of the target site in the acid mitigation method using the converter slag according to the first aspect of the present invention. When the capacity is low, a zeolitic material that increases the cation exchange capacity is mixed.

Since the present invention is configured as described above, the following effects are obtained. In other words, by using the mixed soil of bark compost and converter slag, the fertilizer and the soil mixed with fertilizer and zeolite, it is possible to improve the soil that has become malfunctioning due to the progress of acidification, and the environment where vegetation is easy to grow We can expect to move to.
In addition, the manifestation of this soil effect makes it possible to make the target forest and strongly acidic soil difficult to be washed away by external stress such as rainfall. The remaining material on the target surface can be sprayed, sown, and mixed with a hydraulic excavator, and machines that are used in ordinary civil engineering work can be used.

  Moreover, in this invention, since the base saturation degree of soil can be changed by changing the mixing amount of converter slag to the bark compost which is an organic material, it is set as the soil environment suitable for the vegetation environment around a target site. It becomes possible.

It is a schematic explanatory drawing which shows the implementation process of this invention. It is a schematic diagram which sows the acidic relaxation base material of this invention on an object surface. It is a schematic diagram which mixes the acidic relaxation base material of this invention using construction machines, such as a hydraulic shovel, in the object surface.

(1) In soil environments where soil agglomeration can be maintained, compared to soil pH of 5-6, forest soil, acid sulfate soil, etc. where forest maintenance such as thinning and pruning is currently delayed In the soil environment that is easily acidified, the pH was 4.4 or less, and it was confirmed that the organic matter and salts derived from the organic matter were washed away and the soil structure was made into single grains and sandy. In such an environment, the growth of vegetation is significantly hindered, making it very vulnerable to external stress such as rainfall.
(2) Since bark compost, which is an organic material, is commercialized after curing bark, waste wood, etc. for about 1 to 2 years, it becomes alkaline with a pH of about 8 at the initial stage.
However, such a material alone has a low function of linking the single-grained soil particles, so the use of converter slag, which is a strong alkali, aims to aggregate the soil.
(3) There is a concern that bark materials and converter slag will run away if rainfall continues. In order to prevent the land introduced in this way from flowing away, vinyl acetate binder or neutral inorganic solidifying agent is 1 kg per 1 m ³ for vinyl acetate and 10-20 kg for inorganic solidifying agent. The problem is solved by adding.
(4) In converter slag having a particle size of φ = 10 mm or more or φ = 2 mm or less, it is clogged in the spraying machine when the base material is mixed, so the problem is solved by using a particle size of about φ = 2-5 mm. ing.

Next, examples of the present invention will be described. In FIG. 1, 1 is an acid mitigation base material, 2 is a guest soil obtained by mixing and stirring bark compost and converter slag to seeds, and this is used as the acid mitigation base material 1. Reference numeral 3 denotes seeds, which are commercially available herbs, woody seeds, those collected directly from plants around the target site, and those that are dormant on the land around the target site.
4 is a bark compost, and a material having a C / N ratio of 35 or less and an organic content of 70% or more is used. Specifically, a bark compost alone, a decomposed herb, a wood chip or the like is used. Utilizing a pH (H ₂ O) of 5.5 to 7.5 and an electric conductivity of 0.9 mS / cm or less. 5 is a converter slag, and a pH (H ₂ O) value of 11.0 or more is utilized.

Reference numeral 6 denotes a belt conveyor that conveys the customer soil to the spraying machine 12, and reference numerals 7 to 9 denote members for making the spray material in addition to the customer soil 1. That is, in order to harden the soil, vinyl acetate binder or inorganic neutral solidifying agent is allowed, and 7 obtained by mixing binder 8 with water 9 is obtained.
10 is a generator, 11 is a compressor, 12 is a wet greening base material sprayer, and a hydroseeder or mortar sprayer is used. 13 is a pumping pump, 14 is a water tank, 15 is a switchboard, and 16 is an injection nozzle that sprays the base material 1 onto the strongly acidic soil surface G. In FIG. 3, reference numeral 17 denotes a hydraulic excavator.

"Construction order in specific construction examples"
(1) The customer soil 2 formed by mixing and stirring the seed 3 with the bark compost 4 and the converter slag 5 is used as the acid relaxation base material 1.
(2) A binder 8 used as a reinforcing material for the acid relaxation base material is mixed with water 9 to obtain a mixture 7.
(3) The acid-relaxed base material 1 is sprayed onto the strongly acidic soil surface G for the purpose of acid mitigation using a wet greening base material spraying machine 12.
(4) Depending on the purpose of the strongly acidic soil surface G, the acid relaxation base A is formed by spraying to a thickness of about 1.0 to 5.0 cm.

  Since the present invention is a devastated forest and acid sulfate soil, it is a strong acid soil, and the area where the invasion of vegetation does not occur is administered slowly and continuously by supplying converter slag. Can be expected to restore nature.

1 …… Acid mitigation base material 2 …… Soil 3 …… Seeds 4 …… Burk organic material 5 …… Converter slag 6 …… Conveyor 7 …… Mixture 8… Binder 9 …… Water 10 ... ... Generator 11 ... Compressor 12 ... Base material sprayer 13 ... Water pumping pump 14 ... Water tank 15 ... Switchboard 16 ... Injection nozzle 17 ... Hydraulic excavator

Next, examples of the present invention will be described. In FIG. 1, reference numeral 1 is an acid mitigation base material, and 2 is a guest soil obtained by mixing and stirring bark compost and converter slag into seeds. Reference numeral 3 denotes seeds, which are commercially available herbs, woody seeds, those collected directly from plants around the target site, and those that are dormant on the land around the target site.
4 35 The following is the C / N ratio is bark compost, and the use of organic-containing more than 70% of the material, in particular using bark compost alone and undecomposed herbaceous, woody, such as chips. A pH (H ₂ O) of 5.5 to 7.5 and an electric conductivity of 0.9 mS / cm or less is utilized. Reference numeral 5 denotes converter slag, which has a pH (H ₂ O) value of 11.0 or more.

  The present invention is a Japanese cedar where the acidification of the soil has progressed due to delays in forest maintenance such as thinning, pruning, etc., and soil nutrients have been washed away. Converter slag and organic matter generated when steel is produced for target sites that are strongly acidic and cause a significant drop in soil pH due to special forests such as cypress artificial forests and acidic sulfate soils. Improve the soil structure where the soil pH has been lowered and malfunctioned by the method of spraying and mixing the soil with the vegetation base sprayer, the method of sowing, and the method of mixing with a hydraulic excavator. That made it possible.

In planted forests represented by cedar and cypress, it has been said that the forest function can be restored by securing the illuminance in the forest by reducing the density of trees by reducing forest density such as thinning and pruning. However, the acidification of the soil has become remarkable due to the long period of time in the planted forests that have been planted overcrowded due to low illumination.
In addition, even in places where the soil pH is significantly lowered due to special soil such as acidic sulfate soil and is strongly acidic, it is not possible to improve the soil environment when left as it is. As a countermeasure, there is a method of acid relaxation using inorganic limestone crushed stone, slag slag, shells, concrete waste, etc. and a history of acid relaxation by providing an acid blocking layer in which organic materials are mixed with alkali materials. .

Invention of JP-A-11-61119 Invention of JP 2000-265470 A Invention of Japanese Patent Laid-Open No. 2000-282034

However, the method of using limestone crushed stone, slag slag, shells, concrete waste, etc., which are inorganic substances of the above-mentioned conventional method alone, for acid mitigation alone, reduces the particle size of alkali minerals in order to mitigate the excessive expression of the effect of acid mitigation. Since the alkaline material alone is used, solidification occurs unless the particle size is increased, and the penetration of soil moisture is significantly deteriorated.
In addition, although an organic material is mixed with an alkaline material to create an acidic barrier layer, the soil of planted trees does not have an acidic buffer function, so the effect of buffered acidic soil cannot be buffered by the barrier layer. The problem is that the planted trees die.

  Therefore, the present invention is an undeveloped forest or acidic sulfate soil and has an environment where the pH is lower than 4.4. Therefore, the cation exchange capacity (CEC), which is the power to have nutrients, is significantly reduced, and harmful substances such as aluminum Sprayed with a vegetation base that is a mixture of bark compost, which is an organic material, and strong alkaline materials, such as converter slag, fertilizer, zeolite, etc. By mixing with a hydraulic excavator, it is possible to create a vegetation base that can relax acidity as well as a soil environment in which plants grow.

  Also, cedar, cypress, etc. that have become unable to maintain public functions such as prevention of sediment discharge due to the loss of soil nutrients due to delays in forest maintenance such as thinning and pruning, and soil nutrients have been washed away and aggregated. Because of special soils such as artificial forests and acid sulfate soils, converter slag generated when steel is mixed with organic materials for target sites that have become highly acidic soils with a drastic drop in soil pH The purpose is to improve the soil structure where the soil pH is lowered and malfunctioned by spraying the customer soil on the target surface with a vegetation substrate spraying machine.

1st of this invention WHEREIN: In the acid relaxation construction method using converter slag, it has content of 70% or more of converter slag and organic substance so that the acidity of soil may be eased, and C / N ratio is 35 or less An organic material that enables a bark compost alone or undegraded herbaceous or woody chip having a pH (H2O) of 5.5 to 7.5 and an electrical conductivity of 0.9 mS / cm or less; The structure of acidic soil can be recovered by leaving the mixture of seeds mixed and stirred as an acidic relaxation base material and leaving the mixture of the relaxation base material (1) mixed with binder and water in the target site. It is what you want to do.

In the second aspect of the present invention, in the acid mitigation method using the converter slag according to the first invention, the converter slag is used by blending 5 to 90% in terms of capacity with respect to a bark-based organic material. The mixture prepared by mixing the blended acidic relaxation base material in the spraying machine is sprayed onto the target surface with a hydrocedar or mortar / concrete spraying machine.

  According to a third aspect of the present invention, in the acid relaxation method using the converter slag according to the first invention, the converter slag is used by blending 5 to 90% in terms of capacity with respect to a bark-based organic material. The mixture prepared by mixing the blended acidic relaxation base material is sown by human power and supplied to the target surface.

  According to a fourth aspect of the present invention, in the acid relaxation method using the converter slag according to the first invention, the converter slag is used by blending 5 to 90% in terms of capacity with respect to a bark-based organic material. , The mixed acid mitigation base material is supplied to the target surface while being mixed with the target soil with a hydraulic excavator.

  According to a fifth aspect of the present invention, in the acid mitigation method using the converter slag according to the first invention, the converter slag as a buffer material for increasing the pH of the forest and the strongly acidic soil has a pH (H2O) of 11.0. The above numerical values are used.

  In the acid mitigation method using the converter slag according to the first aspect of the present invention, the converter slag as a buffer material for increasing the pH of the forest and the strongly acidic soil has a particle diameter of φ = 2 to 5 mm. Things are used.

  The seventh aspect of the present invention is the acid mitigation method using the converter slag according to the first aspect of the present invention, wherein fertilizer is blended into the soil, and the cation is analyzed using the analytical value of the chemical property of the strongly acidic target soil. The fertilization design corresponding to the excess or deficiency of the base amount of Ca, Mg, K in the exchange capacity is performed.

  The eighth aspect of the present invention is a cation exchange capacity that is a function of adsorbing bases such as Ca, Mg, K, etc. from the soil analysis results of the target site in the acid mitigation method using the converter slag according to the first aspect of the present invention. Is low, zeolitic materials that increase the cation exchange capacity are added to the soil.

Since the present invention is configured as described above, the following effects are obtained. In other words, by using the mixed soil of bark compost and converter slag, the fertilizer and the soil mixed with fertilizer and zeolite, it is possible to improve the soil that has become malfunctioning due to the progress of acidification, and the environment where vegetation is easy to grow We can expect to move to.
In addition, the manifestation of this soil effect makes it possible to make the target forest and strongly acidic soil difficult to be washed away by external stress such as rainfall. The remaining material on the target surface can be sprayed, sown, and mixed with a hydraulic excavator, and machines that are used in ordinary civil engineering work can be used.

  Moreover, in this invention, since the base saturation degree of soil can be changed by changing the mixing amount of converter slag to the bark compost which is an organic material, it is set as the soil environment suitable for the vegetation environment around a target site. It becomes possible.

It is a schematic explanatory drawing which shows the implementation process of this invention. It is a schematic diagram which sows the acidic relaxation base material of this invention on an object surface. It is a schematic diagram which mixes the acidic relaxation base material of this invention using construction machines, such as a hydraulic shovel, in the object surface.

(1) In soil environments where soil agglomeration can be maintained, compared to soil pH of 5-6, forest soil, acid sulfate soil, etc. where forest maintenance such as thinning and pruning is currently delayed In the soil environment that is easily acidified, the pH was 4.4 or less, and it was confirmed that the organic matter and salts derived from the organic matter were washed away and the soil structure was made into single grains and sandy. In such an environment, the growth of vegetation is significantly hindered, making it very vulnerable to external stress such as rainfall.
(2) Since bark compost, which is an organic material, is commercialized after curing bark, waste wood, etc. for about 1 to 2 years, it becomes alkaline with a pH of about 8 at the initial stage.
However, such a material alone has a low function of linking the single-grained soil particles, so the use of converter slag, which is a strong alkali, aims to aggregate the soil.
(3) There is a concern that bark materials and converter slag will run away if rainfall continues. In order to prevent the land introduced in this way from flowing away, vinyl acetate binder or neutral inorganic solidifying agent is 1 kg per 1 m ³ for vinyl acetate and 10-20 kg for inorganic solidifying agent. The problem is solved by adding.
(4) In converter slag having a particle size of φ = 10 mm or more or φ = 2 mm or less, it is clogged in the spraying machine when the base material is mixed, so the problem is solved by using a particle size of about φ = 2-5 mm. ing.

Next, examples of the present invention will be described. In FIG. 1, 1 is an acid mitigation base material, 2 is a guest soil obtained by mixing and stirring bark compost and converter slag to seeds, and this is used as the acid mitigation base material 1. 3 is a seed, using those dormant in commercial grass seed, or woody seed, or directly collected seed and target area surrounding lands from plants in the target areas around.
Reference numeral 4 denotes bark compost, and a material having a C / N ratio of 35 or less and an organic content of 70% or more is used. Specifically, bark compost alone or undecomposed herb or wood chip is used. A pH (H ₂ O) value of 5.5 to 7.5 and an electric conductivity of 0.9 mS / cm or less is used . 5 is a converter slag, used as 11.0 or more values in pH (H ₂ O).

Reference numeral 6 denotes a belt conveyor that conveys the customer soil to the spraying machine 12, and reference numerals 7 to 9 denote members for making a spray material in addition to the customer soil 2 . That is, in order to harden the soil, vinyl acetate binder or inorganic neutral solidifying agent is allowed, and the binder 8 is mixed with the water 9 to obtain the mixture 7.
10 is a generator, 11 is a compressor, 12 is a wet greening base material sprayer, and a hydroseeder or mortar sprayer is used. 13 is a pumping pump, 14 is a water tank, 15 is a switchboard, 16 is a base material 1
The spray nozzle which sprays on the strongly acidic soil surface G is shown. In FIG. 3, reference numeral 17 denotes a hydraulic excavator.

"Construction order in specific construction examples"
(1) The customer soil 2 formed by mixing and stirring the seed 3 with the bark compost 4 and the converter slag 5 is used as the acid relaxation base material 1.
(2) A binder 8 used as a reinforcing material for the acid relaxation base material is mixed with water 9 to obtain a mixture 7.
(3) The acid-relaxed base material 1 is sprayed onto the strongly acidic soil surface G for the purpose of acid mitigation using a wet greening base material spraying machine 12.
(4) Depending on the purpose of the strongly acidic soil surface G, the acid relaxation base A is formed by spraying to a thickness of about 1.0 to 5.0 cm.

  Since the present invention is a devastated forest and acid sulfate soil, it is a strong acid soil, and the area where the invasion of vegetation does not occur is administered slowly and continuously by supplying converter slag. Can be expected to restore nature.

1 …… Acid mitigation base material 2 …… Soil 3 …… Seeds 4 …… Burk organic material 5 …… Converter slag 6 …… Conveyor 7 …… Mixture 8… Binder 9 …… Water 10 ... ... Generator 11 ... Compressor 12 ... Acidic relaxation base material sprayer 13 ... Water pumping pump 14 ... Water tank 15 ... Switchboard 16 ... Injection nozzle 17 ... Hydraulic excavator

Claims (9)

  In order to reduce the acidity of the soil, the customer soil containing converter slag, seeds, and bark-based organic materials is used as an acid mitigation base material, and the acid mitigation base material is used as a sprayer such as a hydrocedar or a mortar / concrete sprayer. Acid mitigation method using converter slag, which enables recovery of acid soil structure by sowing by manpower, mixing with hydraulic excavator and leaving it on the target site.   The converter slag should be 5 to 90% of the bark-based organic material in terms of capacity, and the mixed acid mitigation base is mixed in the spraying machine to create the customer soil. The acid relaxation construction method using the converter slag according to claim 1, wherein spraying is performed on the slag.   The converter slag is a bark-based organic material blended in an amount of 5 to 90% in terms of capacity, and the blended acidic relaxation base is sown by human power and supplied to the target surface. Acid relaxation method using converter slag as described.   The converter slag is 5 to 90% of the bark organic material in terms of capacity, and is supplied to the target surface while mixing the mixed acid mitigation base with the target soil with a hydraulic excavator. An acid relaxation method using the converter slag according to claim 1. Bark compost, an organic material of bark type, uses a material with a C / N ratio of 35 or less and an organic content of 70% or more, and has a pH (H ₂ O) of 5.5 to 7.5 and an electrical conductivity. The acid relaxation construction method using the converter slag according to claim 1, which uses a value of 0.9 mS / cm or less. The acid mitigation method using the converter slag according to claim 1, wherein the converter slag as a buffer material for raising the pH of forests and strongly acidic soils uses a pH (H ₂ O) of 11.0 or more. .   The acid mitigation method using the converter slag according to claim 1, wherein the converter slag as a buffer material for raising the pH of forests and strongly acidic soils has a particle diameter of φ = 2 to 5 mm.   Fertilizer is mixed with the customer soil, and the fertilizer design that matches the excess or deficiency of the base amount of Ca, Mg, K, etc. in the cation exchange capacity using the analytical value of the chemistry of the soil of the strongly acidic target site The acid relaxation construction method using the converter slag of Claim 1 utilized. If the cation exchange capacity, which is a function of adsorbing bases such as Ca, Mg, K, etc., is low based on the soil analysis results of the target site, a zeolite-based material that increases the cation exchange capacity is added to the soil. An acid relaxation method using the converter slag as described in 1.