JP2001078562A - Soil for planting comprising material containing alkalline calcium compound as raw material and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide both a method for reducing the elution of an alkalline compound by treating a material containing an alkaline calcium compound with an aqueous solution of a salt, etc., and a method for producing soil for planting by treating the material containing the alkalline calcium compound with the aqueous solution of the salt, etc. SOLUTION: This method for producing soil for planting comprises bringing a material containing an alkalline calcium compound into contact with an aqueous solution containing one or more of an iron salt, an aluminum salt and a phosphate by spraying with the aqueous solution or immersing in the aqueous solution to produce the soil for planting. The method for producing soil for planting, composed of the material containing the alkalline metal compound as a raw material comprises bringing the material containing the alkalline calcium compound into contact with a mixed solution obtained by adding one or more of a mineral acid or an organic acid to the solution of the salt by spraying with the mixed solution or immersing in the mixed solution to produce the soil for planting. The method for producing soil for planting comprises compounding the material containing the alkalline calcium compound with one or more of an organic soil amendment, an inorganic soil amendment, soil and fertilizer to produce the soil for planting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planting soil using a material containing an alkaline calcium compound as a raw material and a method for producing the same, and more particularly to an effective use of waste and agriculture, forestry, horticulture, and landscaping in the construction industry. The present invention relates to an appropriate planting soil and a method for producing the same in the field of planting in the civil engineering industry.

[0002]

2. Description of the Related Art The material containing an alkaline calcium compound described in the present invention refers to a material which contains calcium carbonate and calcium hydroxide in a total of 1% or more in terms of calcium oxide and exhibits alkalinity.

[0003] Conventionally, materials containing an alkaline calcium compound, among them concrete concrete, clinker, kaigara, etc., are generated in large quantities as waste materials and are difficult to dispose of.
The development of its effective use was urgent.

However, these materials containing a large amount of an alkaline calcium compound such as calcium hydroxide or calcium carbonate are strongly alkaline for the growth of plants, and thus have not been considered as a raw material for planting soil.

[0005] Therefore, it has been studied to neutralize a material containing an alkaline calcium compound by spraying it with a mineral acid such as sulfuric acid, nitric acid, or hydrochloric acid, and to use the material as planting soil.

[0006] However, at the beginning of application, the alkalinity is neutralized. However, since calcium sulfate, calcium nitrate or calcium chloride generated during the neutralization has high solubility in water, leaching by rainwater is fast, and it is possible to use it outdoors for a long time. When used, the alkalinity increases again.

[0007] Therefore, there is a problem that the growth of the plant is adversely affected, and the plant cannot continue to grow well.

On the other hand, a large amount of soil for planting is required,
Sampling of natural soil is becoming difficult from the viewpoint of protecting the natural environment of the collection site, and it is considered that there is a great demand for soil replacement in the future.

[0009] Therefore, there is a need for a planting soil that reuses a material containing an alkaline calcium compound and a method for producing the same.

[0010]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a method for treating a material containing an alkaline calcium compound to reduce elution of the alkaline calcium compound.

It is another object of the present invention to provide a method for producing planting soil by treating a material containing an alkaline calcium compound.

It is a further object of the present invention to provide a method for recycling a material (waste material) containing a large amount of an alkaline calcium compound.

[0013]

SUMMARY OF THE INVENTION The present invention relates to a planting method in which an aqueous solution containing one or more salts of an iron salt or an aluminum salt is sprayed or immersed in a material containing an alkaline calcium compound, for example, to produce a plant. The soil for use and the production method are the solutions.

The present invention also relates to a planting soil and a method for producing by contacting an aqueous solution containing at least one type of phosphate with a material containing an alkaline calcium compound by spraying or dipping the aqueous solution. This is the solution.

Further, the present invention is characterized in that an aqueous solution obtained by adding at least one of a mineral acid and an organic acid to the aqueous solution of the first invention or the second invention is brought into contact with the aqueous solution by spraying or dipping the aqueous solution. A planting soil and a production method using a material containing a calcium compound as a raw material are used as the solution.

Further, the present invention provides a method of mixing one or more of an organic soil improver, an inorganic soil improver, soil or a fertilizer with a material containing an alkaline calcium compound treated in the first, second or third invention. The planting soil to be produced and the production method are used as the solution.

According to the present invention, when a material containing an alkaline calcium compound is treated by the above-described method, it is possible to eliminate obstacles to plant growth. Therefore, if various nutrients are added in a well-balanced manner, planting soil suitable for growing plants can be obtained.

Hereinafter, the planting soil produced from the material containing the alkaline calcium compound according to the present invention and the production method will be described in more detail.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The first invention relates to a method for preparing a material containing an alkaline calcium compound by adding an iron salt or an aluminum salt to the material.
This is a method in which elution of an alkaline calcium compound is suppressed by spraying or contacting with an aqueous solution containing at least one or more kinds of salts, or the like, so that the soil is suitable for planting soil.

The alkaline neutralizing material according to the present invention contains at least one iron salt or aluminum salt. Preferably, it is an iron salt.

The iron salt or aluminum salt includes sulfate, chloride, nitrate and the like, and is preferably sulfate.

When neutralized with an iron salt or an aluminum salt,
A film of water-insoluble iron hydroxide or aluminum hydroxide is formed on the surface of the material containing the alkaline calcium compound.

The solubility of iron hydroxide and aluminum hydroxide is 2.71 * 10 ^-8 g / L and 9 * 10 ^-4 g / L (18 ° C.), whereas the solubility of calcium hydroxide and calcium sulfate is Is 0.12
9% and 0.208% (25 ℃), the solubility of iron hydroxide and aluminum hydroxide is about the same as calcium hydroxide and calcium sulfate
It is 1 / 10,000 to 1 / 100,000,000 or less.

Therefore, when the material containing the alkaline calcium compound is treated by the method according to the first invention, the elution of the alkali component is suppressed, and the neutralized state can be maintained for a long period of time.

Further, the second invention suppresses the elution of the alkaline calcium compound by spraying or dipping the aqueous solution containing the phosphate on the material containing the alkaline calcium compound, thereby making the material suitable for planting soil. It is a method of reforming into something.

Examples of the phosphate include potassium phosphate, sodium phosphate, ammonium phosphate and the like, with ammonium phosphate and potassium phosphate being preferred.

When neutralized with a phosphate, a water-insoluble calcium phosphate film is formed on the surface of the material containing the alkaline calcium compound, and the same effect is exerted.

The solubility of calcium phosphate is 0.03% (25%).
° C), whereas the solubility of calcium hydroxide and calcium sulfate is 0.129% and 0.208% (25 ° C).
The solubility of calcium phosphate decreases to about 1/4 to 1/7.

As a result, elution of alkali from the treated material containing an alkaline calcium compound is suppressed,
The neutralized state can be maintained for a long time.

The third invention provides an alkaline calcium compound by spraying or dipping an aqueous solution obtained by adding one or more of a mineral acid or an organic acid to the aqueous solution of the first or second invention. This is a method of suppressing the dissolution of the soil and modifying the soil to be suitable for planting soil.

To make the neutralization more efficient, sulfuric acid, nitric acid,
Hydrochloric acid or an organic acid can also be added. that time,
If these acids are added in excess, the surface of the material containing the alkaline calcium compound will tilt toward the acidic side, and the formation of the film will deteriorate.

Acids added to iron salts, aluminum salts and phosphates include sulfuric acid, nitric acid, hydrochloric acid and organic acids. Sulfuric acid and nitric acid containing essential elements for plant growth are preferred.

The pH range of the additive solution is 1.0 to 6.5, preferably 2.0 to 4.0. PH of treated mixture
Is 6.0 to 8.5, preferably 6.5 to 8.0.

The present invention also relates to a method of mixing at least one of an organic soil improver, an inorganic soil improver, soil or a fertilizer with a material containing an alkaline calcium compound treated in the first, second or third invention. By doing so, planting soil that is more suitable for plant growth can be produced. In this case, an acidic soil conditioner is more preferable.

Organic soil improvers such as peat moss and coco dust, and inorganic soil improvers such as pearlite, zeolite,
Fertilizers include natural fertilizers, chemical fertilizers, trace element fertilizers, and the like, but are not limited thereto.

The mixing ratio (volume) of the inorganic or organic soil amendment to the material containing the treated alkaline calcium compound is 0.5 to 10 times, preferably 2 to 5 times.

Further, the material containing the alkaline calcium compound treated in the first, second or third invention can be used as a soil conditioner.

[0038]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto.

[Example 1] ALC crushed product (water content 15%)
To 500 g, 400 ml each of 1%, 3%, 5%, 7% ferrous sulfate and aluminum sulfate solution and a mixed solution of 5% ferrous sulfate and aluminum sulfate were uniformly added and air-dried. The comparative example is an untreated ALC crushed product. The pH of the treated ALC crushed material and the ALC crushed material was measured.

Further, 500 ml of water was added to 50 g of the treated ALC crushed product, washed, air-dried, and the pH was measured. Table 1 shows the results.

The pH was measured according to the soil environment analysis method. The ratio of the sample to the extract is 1: 2.5.

[0042]

[Table 1] pH of treated ALC crushed product pH of ALC crushed product after washing Comparative example 1 No addition 9.88 9.89 Treatment example 1 Ferrous sulfate 1% 9.15 9.29 Treatment example 2 Ferrous sulfate 3% 8.50 8.65 Treatment example 3 Sulfuric acid Ferrous iron 5% 8.26 8.32 Ferrous sulfate 7% 8.01 8.12 Galvanic acid 1% 9.20 9.31 Galvanic acid sulfate 3% 8.65 8.75 Galvanic acid 7% Aluminum sulfate 5% 8.54 8.68 Galvanic acid 8 7% 8.10 8.25 Treatment example 9 Ferrous sulfate + aluminum sulfate 5% 8.51 8.72 Treatment example 10 Sulfuric acid 0.5% 7.78 8.90

As shown in Table 1, the pH of the crushed ALC was lowered by the addition of the ferrous sulfate and aluminum sulfate solutions. In addition, the higher the concentration of the additive liquid, the higher the pH of the ALC crushed material.
The decline was significant. The pH after washing was stably maintained. However, the pH of the neutralized product of treatment example 10 using only sulfuric acid was increased by washing with water.

[Example 2] ALC crushed product (water content 15%)
400% each of a solution of 1%, 3%, 5% ammonium dihydrogen phosphate and potassium dihydrogen phosphate in 500 g
Add uniformly and air dry. As a comparative example, it is an untreated ALC crushed product. The pH of the treated ALC crushed product and the ALC crushed product was measured.

In addition, 50 g of the crushed ALC treated in Example 1
After adding 500 ml of water and washing, it was air-dried and the pH was measured. Table 2 shows the results.

[0046]

[Table 2] Treatment ALC crushed product pH pH of ALC crushed product after washing Comparative example 1 No addition 9.88 9.89 Treatment example 11 Ammonium dihydrogen phosphate 1% 8.87 9.29 Treatment example 12 Ammonium dihydrogen phosphate 3% 8.60 8.91 Treatment example 13 Ammonium dihydrogen phosphate 5% 8.46 8.71 Treatment example 14 Potassium dihydrogen phosphate 1% 9.23 9.39 Treatment example 15 Potassium dihydrogen phosphate 3% 9.09 9.33 Treatment example 16 Potassium dihydrogen phosphate 5% 9.15 9.30

As shown in Table 2, the pH of the crushed ALC was lowered by the addition of the solution of ammonium dihydrogen phosphate and potassium dihydrogen phosphate. Also, the higher the concentration of the additive liquid, the greater the decrease in pH of the crushed ALC. PH after washing
It became slightly higher.

[Example 3] ALC crushed product (water content 15%)
500% 3% ferrous sulfate + 0.5% sulfuric acid aqueous solution, 7% ferrous sulfate + 0.5% sulfuric acid aqueous solution, 3% ferrous sulfate + 1.0% sulfuric acid aqueous solution, 7% ferrous sulfate + 1.0% sulfuric acid aqueous solution, 3% aluminum sulfate + 0.5% sulfuric acid aqueous solution, 7% aluminum sulfate + 0.5
400 ml of a 3% aqueous solution of sulfuric acid, a 3% aqueous solution of aluminum sulfate + 1.0% sulfuric acid, and a 7% aqueous solution of aluminum sulfate + 1.0% sulfuric acid were uniformly added, and air-dried. The comparative example is an untreated ALC crushed product. The pH of the treated ALC crushed product and the ALC crushed product was measured.

Also, 500 ml of water was added to 50 g of the treated ALC crushed product, washed, air-dried, and the pH was measured. Table 3 shows the results.

[0050]

[Table 3] pH of treated ALC crushed product pH of ALC crushed product after washing Comparative example 1 No addition 9.88 9.89 Treatment example 17 3% ferrous sulfate + 0.5% sulfuric acid aqueous solution 8.21 7.78 Treatment example 18 7% ferrous sulfate + 0.5% sulfuric acid aqueous solution 7.61 7.56 Treatment example 19 3% ferrous sulfate + 1.0% sulfuric acid aqueous solution 8.12 7.56 Treatment example 20 7% ferrous sulfate + 1.0% sulfuric acid aqueous solution 7.48 7.32 Treatment example 21 3% aluminum sulfate + 0.5% sulfuric acid aqueous solution 8.25 7.97 Treatment example 22 7% aluminum sulfate + 0.5% sulfuric acid aqueous solution 7.70 7.50 Treatment example 23 3% aluminum sulfate + 1.0% sulfuric acid aqueous solution 8.24 7.85 Treatment example 24 7% aluminum sulfate + 1.0% sulfuric acid aqueous solution 7.92 7.65

As shown in Table 3, the pH of the crushed ALC was rapidly lowered by the addition of a mixed solution of ferrous sulfate, aluminum sulfate and sulfuric acid. The effect was higher than in Examples 1 and 2. Also, the higher the concentration of the additive liquid, the higher the p
The decrease in H was large. The pH after washing was slightly lower.

[Example 4] Using the ALC crushed material treated in Example 3 (Processing example 18), coconut dust was mixed in a ratio of 2: 1 by volume, and planting soil suitable for plant growth I got

[Planting Test] A planting growth test was performed using the treated ALC crushed product of the present invention obtained in Examples 1, 2, 3, and 4. There were eight types of processing, Comparative Example 1, Processing Example 4, Processing Example 8, Processing Example 10, Processing Example 13, Processing Example 16, Processing Example 18, and Processing Example 22. 500 ml of the soil for planting was taken, the same fertilizer was added, and the 500 ml pot was filled. The test plant was Komatsuna, and two plants were planted. The cultivation period was 55 days, and the water management during cultivation was the same. The growth results of Komatsuna were evaluated by their weight (total dry weight, above-ground dry weight, underground dry weight). The results are shown in Table 4.

[0054]

[Table 4] Total dry weight Above ground dry weight Underground dry weight (g / pot) (g / pot) (g / pot) Comparative example 1 0.34 0.22 0.12 Treatment example 4 0.70 0.45 0.25 Treatment example 8 0.59 0.38 0.21 Treatment example 10 0.37 0.24 0.13 Processing example 13 0.68 0.44 0.24 Processing example 16 0.62 0.40 0.22 Processing example 18 0.79 0.51 0.28 Processing example 22 0.67 0.43 0.24 Example 4 1.28 0.90 0.38

As shown in Table 4, the total dry weight of Komatsuna of Processing Example 10 was comparable to that of Comparative Example 1. No effect of sulfuric acid treatment was observed. On the other hand, processing examples 4, 8, 13,
The total dry weight of Komatsuna 16, 18, and 22 was double that of Comparative Example 1. The treatment effect of iron salt, aluminum salt and phosphate was recognized. Further, the total dry weight of the komatsuna of Example 4 was remarkably larger than that of Comparative Example 1 and quadrupled. A synergistic effect of iron salt treatment and coconut dust contamination was observed. Therefore, it is understood that the elution of alkali from the crushed ALC is suppressed, and the planting soil treated by this method is excellent.

[0056]

According to the present invention, an aqueous solution containing at least one salt selected from the group consisting of iron salts, aluminum salts and phosphates is sprayed on a material containing an alkaline calcium compound according to the present invention or immersed in the aqueous solution. Materials modified by spraying or immersing a mixed solution in which one or more of a mineral acid or an organic acid is added to an aqueous solution are used as planting soil because elution of an alkaline calcium compound is suppressed. Are better. Also, planting soil produced by mixing at least one of an organic soil amendment, an inorganic soil amendment, soil or a fertilizer with a material containing an alkaline calcium compound treated by the above method is more suitable for plant growth. ing. The planting soil and its production method using a material containing this alkaline calcium compound as a raw material in the construction industry field, the effective use of waste,
In the field of planting in agriculture, forestry, horticulture, landscaping, and civil engineering, a method for producing planting soil is provided.

Claims (4)

[Claims] 1. A planting soil characterized by being produced by spraying or dipping an aqueous solution containing at least one salt of an iron salt or an aluminum salt on a material containing an alkaline calcium compound, or by immersing the material in the aqueous solution. Its manufacturing method. 2. A planting soil and a method for producing the same, comprising contacting a material containing an alkaline calcium compound with a material containing one or more salts of a phosphate by spraying or dipping the material in the solution. . 3. An alkaline calcium compound which is produced by spraying or dipping an aqueous solution obtained by adding at least one of a mineral acid and an organic acid to the aqueous solution of claim 1 or 2 or the like. And a method for producing the same, using a material containing as a raw material. 4. A planting method comprising mixing at least one of an organic soil improver, an inorganic soil improver, soil or a fertilizer with a material containing an alkaline calcium compound treated according to claim 1, 2 or 3, and producing the mixture. For soil and its production method.