JP2001080979A - Production of fertilizer consisting of incineration ash as raw material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to recycle incineration ash of phosphorus- containing sludge and industrial waste as a phosphoric fertilizer by adding additives including magnesium, calcium, or the like, at need to the incineration ash and melting the mixture, then forming slag by rapid cooling and pulverizing the slag. SOLUTION: The incineration ash preferably containing 10 to 40 wt.% phosphoric acid is used as the raw material and is subjected to component regulation by adding <=50% P, <=60% Mg, <=80% Ca, or the like, at need thereto and after the mixture is melted, the mixture is formed as the slag by rapid cooling and the slag is pulverized. The addition quantities of these additives, such as phosphoric acid, magnesium oxide and calcium oxide, are respectively specified to 20 to 25% P (in terms of P2O5), 2.5 to 4.5 molar ratio (by P2O5) Mg (in terms of MgO) and 2.5 to 4.5 molar ratio (by P2O5) Ca (in terms of CaO). As a result, the natural resources included in the incineration ash are effectively utilized and the disposal amount thereof may be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention belongs to the technical field of fertilizer production using sludge or other incinerated ash as a raw material.

[0002]

2. Description of the Related Art Although incinerated ash such as sludge, municipal garbage or industrial waste contains many natural resources, these natural resources have hardly been used in the past. In recent years, the finite nature of natural resources has been recognized, and pollution caused by mass consumption of natural resources has become a problem, leading to a situation in which recycling technologies for reusing natural resources are being actively researched. I have. As a technique for recycling incinerated ash such as sludge, municipal garbage, or industrial waste, a method of using as construction material or a method of using as fertilizer has been proposed.

[0003] As a method of recycling industrial waste, sewage sludge incineration ash and the like and using it as a soil additive for improving soil, for example, Japanese Patent Application Laid-Open No. Hei 6-93260.
There is a method disclosed in the issue. The invention disclosed herein is a method of adding another compound or the like to waste silica sand, that is, waste sand containing a large amount of silicon oxide such as foundry sand after use, and firing it at a high temperature to obtain a soil additive. It is.

[0004] Also, Japanese Patent Application Laid-Open No. 9-328385.
No. 1 discloses a method of producing fertilizer using sludge incineration ash. The invention disclosed herein is a fertilizer obtained by adding 20 to 50% by weight of calcium sulfate to sludge incineration ash to produce a fertilizer, and this fertilizer contains a large amount of calcium. All of the above fertilizer production methods merely involve mixing additives, and there is a problem that the phosphorus component contained in waste sand or incinerated ash cannot be effectively recycled.

Techniques for recycling incinerated ash such as sludge, municipal garbage or industrial waste as construction materials such as aggregates are disclosed in, for example, Japanese Patent Application Laid-Open Nos. 8-27673 and 9-196573. It has been disclosed. However, the above method used as a construction material merely reduces the amount of incinerated ash to be disposed of, and has a problem in that natural resources contained in the incinerated ash are not effectively recycled.

[0006]

As described above, the conventional recycling technology has established a technology for effectively recycling even a large amount of phosphorus components in waste materials such as incinerated ash. The only way to produce phosphate fertilizer was to use phosphate rock. The present invention has been made under the above-mentioned background, and has an object to provide a method of recycling incinerated ash containing a large amount of a phosphorus component as a phosphate fertilizer.

[0007]

Investigations and experiments to solve the problems In order to solve the above-mentioned problems, the following investigations and experiments were performed on incinerated ash. First, the main composition of the incineration ash generated from the sewage sludge incineration facility was investigated, and the results shown in FIG. 3 were obtained. This survey was conducted on incinerated ash generated from more than a dozen sewage sludge incineration facilities. However, since the purpose of the present invention is to recycle the phosphorus component in the incineration ash, incineration ash with a low phosphorus content is excluded.

From the investigation results shown in FIG. 3, it was found that the composition components contained in the incineration ash generally contained the components and amounts shown in FIG. 4 (A). That is, the phosphorus component is contained in the range of 10 to 40% by weight in terms of phosphoric acid (hereinafter referred to as phosphorus pentoxide P2O5). However, incinerated ash cannot be used directly as phosphorus fertilizer. In order to use it as a phosphorus fertilizer, it is necessary to make it a soluble phosphorus component suitable for crop absorption. In addition, there are laws and regulations for selling as a phosphorus fertilizer (fused phosphorus fertilizer), and it is specified that the soluble calcium is 17% by weight or more, the alkali content is 40% by weight or more, and the soluble magnesium is 12% by weight or more. And the maximum content of harmful metals is regulated. In addition, even when it cannot be sold as a single fertilizer, it can be used as a raw material for a chemical fertilizer, or can be used as a raw material for a mixed fertilizer. In consideration of the above, incineration ash A shown in FIG.
The following experiment was performed using incineration ash B as a sample. Incinerated ash A contains approximately 23 weight percent phosphoric acid and incinerated ash B contains approximately 28 weight percent phosphoric acid.

FIG. 5A shows an experimental plan for incinerated ash A, and FIG. 5B shows an experimental plan for incinerated ash B. That is,
The molar ratio of magnesium oxide and the molar ratio of calcium oxide are changed to various values with respect to the amount of phosphoric acid contained in the raw material, and melting and quenching treatments are carried out to obtain a phosphoric acid dissolution rate and magnesium oxide dissolution. We examined how the dissolution rate changed. FIG. 6 shows a change in the solubility of phosphoric acid in incinerated ash A, and FIG. 7 shows a change in the solubility of magnesium oxide in incinerated ash A. The dissolution rate of phosphoric acid (dissolution rate of magnesium oxide) indicates the ratio of dissolvable phosphoric acid (soluble magnesium oxide) to phosphoric acid (magnesium oxide) contained in the product.

FIG. 6A shows a change in the dissolution rate of phosphoric acid with respect to the content of magnesium oxide, using the content of calcium oxide (expressed in terms of molar ratio; the same applies hereinafter) as a parameter. FIG. 6B shows a change in the solubility of phosphoric acid with respect to the content of calcium oxide, using the content of magnesium oxide as a parameter. In the following, the molar ratio of calcium oxide and magnesium oxide refers to the molar ratio to phosphoric acid. From this result, when the molar ratio of calcium oxide is 3.5 or more and the molar ratio of magnesium oxide is 3.5 or more, the solubility of phosphoric acid is approximately 100%, and the molar ratio of calcium oxide is approximately 3.0. Below, the molar ratio of magnesium oxide is approximately 3.
If it is 0 or less, the solubility of phosphoric acid monotonously increases with respect to the content of calcium oxide and magnesium oxide.

FIG. 7A shows a change in the dissolution rate of magnesium oxide with respect to the content of magnesium oxide, using the content of calcium oxide as a parameter. FIG. 7B shows a change in the dissolution rate of magnesium oxide with respect to the content of calcium oxide using the content of magnesium oxide as a parameter. From this result, the solubility of magnesium oxide becomes maximum when the molar ratio of magnesium oxide is around 3.5 regardless of the content of calcium oxide, and the solubility of magnesium oxide increases almost in proportion to the molar ratio of calcium oxide. . That is, the dissolution rate of magnesium oxide is maximized when the molar ratio of magnesium oxide to phosphoric acid is about 3.5, and the dissolution rate of magnesium oxide increases as the molar ratio of calcium oxide increases.

FIG. 8 and FIG. 9 are graphs showing the experimental results of the change in the solubility of phosphoric acid and the change in the solubility of magnesium oxide in incinerated ash B. As can be determined from these graphs, the dissolution rate of phosphoric acid shows almost the same tendency as in the case of incinerated ash A. That is, when both the molar ratio of magnesium oxide to phosphoric acid and the molar ratio of calcium oxide are 3.5 or more, the dissolution rate is almost 100%. However, when either the molar ratio of magnesium oxide or the molar ratio of calcium oxide is 3.5 or less, incineration ash A
In the case of incinerated ash B, the rate of dissolution is larger than that of incinerated ash B. That is, the higher the phosphoric acid content, the higher the solubility. In addition, regarding the dissolution rate of magnesium oxide, the dissolution rate becomes maximum when the molar ratio of magnesium oxide to phosphoric acid is about 3.5, and is substantially constant with respect to the molar ratio of calcium oxide. It decreases slightly with increasing molar ratio of calcium oxide.

From the above experimental results, the mixed raw material (incinerated ash +
When both the molar ratio of magnesium oxide and the molar ratio of calcium oxide to phosphoric acid in the additive are 3.5 or more, the dissolution rate of phosphoric acid becomes maximum at almost 100%,
When one of the molar ratios is 3.5 or less, the ratio increases with the molar ratio of magnesium oxide or calcium oxide. The solubility of magnesium oxide is maximized when the molar ratio of magnesium oxide to phosphoric acid is around 3.5. When the content of phosphoric acid is small (in the case of incinerated ash A), the dissolution rate of magnesium oxide increases with an increase in the molar ratio of calcium oxide to phosphoric acid, but when the content of phosphoric acid is large (incinerated ash A). In the case of B), it was confirmed that the solubility of magnesium oxide was substantially constant or decreased with an increase in the molar ratio of calcium oxide to phosphoric acid.

FIGS. 10 and 11 show the results of experiments conducted to determine the relationship between the composition of the raw materials and the case where the raw material is produced by performing a predetermined process. FIG. 10 (A) shows incineration ash A and incineration ash B
FIG. 10 shows the composition and amount of the additive added to FIG.
(B) shows a table obtained by calculating the composition and the molar ratio when additives are added and mixed. In the table of FIG. 10B, the sample numbers are the same as the order shown in FIG. When an additive was added, a molar ratio at which the solubility was substantially maximized was selected. FIG. 11 shows the results obtained by determining the amount of co-soluble phosphoric acid, the amount of co-soluble magnesium oxide, the amount of alkali and the residual amount of cadmium when the product is produced by performing a predetermined treatment such as melting.

From the results of this experiment, it was found that the amount of phosphoric acid in the mixed raw material was set to approximately 18% by weight, and the molar ratio of magnesium oxide and calcium oxide was set to a value close to the value at which the dissolution rate became maximum. It has been found that the ingredients that can be sold as single fertilizers are obtained by clearing the regulation values of the law. However, in order to use incinerated ash effectively, it is not necessary to clear the regulation values of the Fertilizer Control Law, but if it is used as an auxiliary fertilizer such as a mixed fertilizer or a chemical fertilizer, depending on the composition and other properties of the incinerated ash Incineration ash can be used, and effective recycling of natural resources can be planned.

Further, in order to be able to use as a fertilizer, a large amount of harmful substances must not be contained. The maximum allowable amount of harmful components is determined by the Fertilizer Control Law, and the maximum regulatory value for sewage sludge fertilizer is shown in the lowermost column of the table in FIG.
In addition, the upper column of the table shows harmful components contained in incineration ash A, and the left column of the middle column shows a case where no additive is added (sample A-3) and after a predetermined treatment such as melting. The remaining amount of harmful substances is shown, and the right side of the middle column shows the removal rate of harmful substances by the treatment. Note that mercury was too small to be measured.

As can be seen from the above table, chromium (Cr)
Except for the above, the composition of the harmful substance is significantly reduced by a predetermined treatment such as melting. Although chromium slightly exceeds the regulation value, when it is a chemical fertilizer or a mixed fertilizer, it is possible to clear the regulation value by adding another fertilizer having a low chromium content. Therefore, after the prescribed treatment such as melting without adding phosphoric acid, magnesium oxide, and calcium oxide, the amounts of the soluble phosphoric acid, the soluble magnesium oxide, and the alkali content do not meet the regulation values. There is a possibility that it can be used as an auxiliary fertilizer. Based on the experimental results and considerations described above, the following method has been invented as means for solving the above-mentioned problems.

[0018]

The present invention employs the following means to solve the above-mentioned problems. That is, claim 1
The described invention is characterized by including a step of using sludge containing phosphorus or other incinerated ash as a raw material, melting the raw material, and then rapidly cooling to form slag. The invention according to claim 2 is characterized in that, in the invention according to claim 1, after the quenching step, a step of pulverizing the slag is included.

According to a third aspect of the present invention, in the first aspect of the present invention, before the melting step, the content of phosphorus in the incinerated ash is 50% by weight or less. It is characterized by including a step of adding an additive.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the phosphorus-containing additive is obtained by converting the content of phosphorus in the mixed raw material after addition to 20 to 2 parts by conversion to phosphoric acid.
It is characterized by having a composition containing 5% by weight of phosphorus.

The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein before the melting step, magnesium having a value of 60% by weight or less based on the incinerated ash is contained. It is characterized by including a step of adding an additive.

According to a sixth aspect of the present invention, in the invention of any one of the first to fourth aspects, in the adding step, the amount of magnesium contained in the mixed raw material is converted into magnesium oxide. The molar ratio with respect to the content of phosphoric acid contained in the raw material or the mixed raw material is 2.
It is characterized in that it has a composition containing 5 to 4.5 magnesium.

The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein before the melting step, calcium having a value of 80% by weight or less based on the incinerated ash is contained. It is characterized by including a step of adding an additive.

[0024] According to an eighth aspect of the present invention, in the first aspect of the present invention, the adding step includes the step of:
The amount of calcium contained in the mixed raw material is converted into calcium oxide, and the molar ratio to the content of phosphoric acid contained in the raw material or the mixed raw material is 2.5 to 4.5.
Is characterized by having a composition containing calcium.

According to a ninth aspect of the present invention, in the invention according to any one of the first to eighth aspects, in the adding step, the addition amounts of magnesium and calcium contained in the mixed raw material are reduced by magnesium oxide. Alternatively, the composition is characterized in that the composition is such that the molar ratio to the content of phosphoric acid contained in the raw material or the mixed raw material is 3 to 4 in terms of calcium oxide.

According to a tenth aspect of the present invention, in the invention according to any one of the first to ninth aspects, the incinerated ash has a phosphoric acid content of 10 to 40% by weight. .

According to an eleventh aspect of the present invention, in the invention according to any one of the first to tenth aspects, before the adding step, a sample of the incinerated ash is analyzed and produced based on the analysis result. It is characterized by including a step of determining the rank of the phosphorus fertilizer, and determining the components and the amount of the additive.

[0028]

Embodiments and examples of the present invention will be described below with reference to the drawings. FIG. 1 shows a production process according to an embodiment of the present invention. In FIG. 1, step S1
Then, a sample of incineration ash is collected and the composition is analyzed.
The composition analysis analyzes the content of phosphoric acid, magnesium oxide, and calcium oxide, as well as the composition of substances and harmful substances that may serve as raw materials for fertilizers. The incinerated ash is obtained by incinerating sludge, municipal garbage, industrial waste, or the like, and using ash containing phosphorus components. The content of phosphorus is preferably 20% by weight or more in terms of phosphoric acid. Examples of those containing a high concentration of phosphorus include industrial wastewater, livestock wastewater, and human waste input wastewater. FIG. 4B shows the composition of the incineration ashes A and B in this embodiment.
Shown in

In step 2, the rank of the product to be produced is determined in consideration of the results of the composition analysis, the price of the product, the price of the added raw material, the conditions of the equipment, and the like. As the rank of the product, for example, whether it is a single fertilizer that cleared the regulation value, or a product that is a raw material of chemical fertilizer without clearing the regulation value,
Alternatively, it may be a three-stage rank of adding an additive to the product as a mixed fertilizer with almost no addition, or may further classify the rank more finely, or may classify it into two ranks. . In this embodiment, the products are classified into the ranks shown as the target products in FIG.

In step 3, the components of the additive and the amount of addition (or the range of the amount of addition) are determined from the composition of the incineration ash and the composition of the rank of the product to be produced using the above-described experimental results, or Calculate by other methods. The additives include a magnesium component and a calcium component. The magnesium component may be added alone, or the calcium component may be added simultaneously with the magnesium component. The amount of addition depends on the degree to which the incinerated ash contains these components and also on the rank of the product to be produced. The amount of magnesium added is calculated in terms of magnesium oxide (MgO). In the case of sludge incineration ash, the molar ratio to phosphoric acid in the mixed raw material is 2.5 to 4.
Preferably, about 5 is added. In addition, the amount of calcium to be added is preferably about 2.5 to 3.5 in terms of calcium oxide (CaO) in terms of molar ratio to phosphoric acid in the mixed raw material. In addition, in order to adjust the components of the fertilizer, other components may be further added, or the magnesium component and the calcium component may not be added in some cases.

One of the purposes of adding the magnesium and calcium components is, for example, in the case of sewage sludge incineration ash, magnesium oxide (MgO) is a few percent, alkali (a content of soluble calcium and soluble magnesium converted into calcium oxide amount). In some cases) may contain only about 5 to 20% by weight. In order to use as fused phosphorus fertilizer (referred to as fused magnesium phosphorus fertilizer), it is necessary to adjust the components to increase the content of these. In addition, the other purpose is to lower the melting point to homogenize the molten components, increase the destruction rate of the fluorapatite structure, increase the solubility of phosphorus in the fertilizer in citric acid, and increase the effect and value as a fertilizer That is. Further, when a magnesium component is added, the melting point decreases and the solubility of phosphorus in citric acid increases.
Further, when the calcium component is added, the composition ratio of the alkali component increases, and the value of the fertilizer increases. The composition of the additive may be determined by another method (criterion) without being determined by the above method. FIG. 2 shows an example of the composition and amount of the additive in the present embodiment.

In step S4, the mixture is heated and melted in a melting furnace. As the melting furnace, a conventionally known melting furnace such as an electric furnace or a flat furnace is used. The heating temperature is equal to or higher than the melting temperature. The melting temperature varies depending on the composition of the raw material, but is generally in the range of 1200 to 1500 degrees Celsius. When heated above the melting temperature for a suitable period of time, the mixture completely melts and fluidizes into molten slag. In this embodiment, as shown in FIG.
It is 20 minutes in degrees.

In step S5, the molten slag is taken out from a discharge port (for example, a discharge port provided in the furnace bottom), poured into, for example, a water tank, and quenched. Quenching is an important treatment for solubilizing phosphoric acid in citric acid. If the quenching is insufficient, fluorapatite or the like precipitates, and the solubility of the polymer decreases. The term "soluble" refers to phosphoric acid dissolved in a 2% citric acid solution. Cu-soluble phosphoric acid is dissolved and absorbed by the action of the roots of the crop, and has no significant effect in the early stage of fertilization, but has a characteristic that the fertilizing effect is persistent. In addition, the ku-soluble phosphoric acid does not run off due to rainwater or combine with aluminum or iron in the soil to become unsupplied. Therefore, it is important to solubilize the phosphoric acid content contained in the fertilizer so that the fertilizer performs energy metabolism and substance synthesis for a long time and does not cause phosphorus deficiency. The molten slag cooled in the water tank becomes glassy fine particles.

In step S6, the fertilizer in the form of glassy fine particles is dried and pulverized to obtain a product. FIGS. 11 and 12 show the analysis results of the product in this example. As can be understood from the analysis data shown in FIG. 11, both the product A-1 and the product B-1 have cleared the regulation values, and can be sold as a single fertilizer. Although the product A-2 has not cleared the regulation value, it can be used as a raw material for chemical fertilizer. Product A-
3. As can be seen from the data in FIG. 12, the product B-2 has no harmful components removed and can be used as a fertilizer raw material.

As described above, the present embodiment has the following effects. Since the fertilizer product can be selected according to the composition of the incineration ash, there is an effect that incineration ash of a wide composition range can be used. As a result, the resources can be effectively recycled, and the resources can be protected and the environment can be protected. In addition, by adding additives so that the composition of the mixed raw material becomes the best ratio, it is possible to produce low-cost single fertilizer that increases the rate of dissolution and clears regulatory values, thereby improving profits. There is also. In addition, since the composition of the added raw material can be determined based on the market price of the product and the like, there is an effect that the production adjustment of the fertilizer can be easily performed.

The embodiments and examples of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the examples, and changes in design and the like may be made without departing from the gist of the present invention. Even if there is, it is included in the present invention. For example, the present invention can be applied to incinerated ash such as municipal waste or industrial waste containing phosphorus. Cooling for slag formation is not limited to cooling in a water tank. For example, the cooling may be performed in another container or a water stream. In addition, when other components are added, and an additive that does not have a remarkable effect or a unique effect is added, it belongs to the technical scope of the present invention. In addition, the method for determining the components and amounts of the additives is not limited to the method described above, and may be determined based on any criteria.

[0037]

As described above, according to the configuration of the present invention, it is possible to produce an effective fertilizer having high solubility in water by using incineration ash and to produce a product according to the rank of the product. There is an effect that incineration ash of a wide composition range can be used. Therefore, the resources can be effectively recycled, and the resources can be effectively protected and the environment can be protected. In addition, there can be obtained an economical and low-cost production. Further, if the composition of the added raw material is determined based on the market price of the product, etc., there is an effect that the production adjustment of the fertilizer can be easily performed.

[Brief description of the drawings]

FIG. 1 shows a flowchart of a production method according to an embodiment of the present invention.

FIG. 2 shows various conditions of the present embodiment.

FIG. 3 shows the composition of sewage sludge incineration ash.

FIG. 4 (A) shows the component range of the incinerated ash, and FIG. 4 (B) shows the composition of the sample.

FIGS. 5A and 5B show an experimental plan using a sample.

6 (A) and 6 (B) show changes in the dissolution rate of phosphoric acid in sample A. FIG.

7 (A) and 7 (B) show changes in the solubility of magnesium oxide in sample A. FIG.

8 (A) and 8 (B) show changes in phosphoric acid dissolution rate of sample B. FIG.

FIGS. 9A and 9B show changes in the dissolution rate of magnesium oxide in Sample B. FIGS.

10A shows the composition of an additive, and FIG. 10B shows the composition of a mixed raw material.

FIG. 11 shows the composition of the sample after processing.

FIG. 12 shows a residual composition of a harmful component.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C05D 3:02) (C05G 1/00 C05D 5:00) (72) Inventor Tetsuji Sadazuka Yurakucho, Chiyoda-ku, Tokyo 1-4-1 Sanki Kogyo Co., Ltd.

Claims (11)

[Claims] 1. Production of fertilizer using incinerated ash as a raw material, comprising a step of using sludge containing phosphorus or other incinerated ash as a raw material, melting the raw material, and then rapidly cooling the slag to form a slag. Method. 2. The method according to claim 1, further comprising a step of pulverizing the slag after the quenching step. 3. Prior to the melting step, 5 min.
The method for producing a fertilizer using incinerated ash as a raw material according to any one of claims 1 and 2, further comprising a step of adding an additive containing phosphorus having a value of 0% by weight or less. 4. In the addition step, the phosphorus-containing additive has a composition containing 20 to 25% by weight of phosphorus in terms of phosphoric acid in terms of the content of phosphorus in the mixed raw material after addition. The method for producing a fertilizer using the incinerated ash according to claim 3 as a raw material. 5. The method according to claim 5, wherein before the melting step, 6 incineration ash is applied.
The method for producing a fertilizer from incinerated ash according to any one of claims 1 to 4, further comprising a step of adding an additive containing magnesium having a value of 0% by weight or less. 6. In the adding step, the amount of magnesium contained in the mixed raw material is converted into magnesium oxide, and the molar ratio to the content of phosphoric acid contained in the raw material or the mixed raw material is 2. The method for producing a fertilizer using incinerated ash as a raw material according to any one of claims 1 to 4, wherein the composition contains a magnesium containing 5 to 4.5 magnesium. 7. The method according to claim 8, wherein said incineration ash is treated with 8
The method for producing a fertilizer from incinerated ash according to any one of claims 1 to 6, further comprising a step of adding an additive containing calcium having a value of 0% by weight or less. 8. In the adding step, the amount of calcium contained in the mixed raw material is converted into calcium oxide, and the molar ratio to the content of phosphoric acid contained in the raw material or the mixed raw material is 2. The method for producing a fertilizer using incinerated ash as a raw material according to any one of claims 1 to 6, wherein the composition contains calcium of 5 to 4.5. 9. The content of phosphoric acid contained in the raw material or the mixed raw material, wherein the amount of magnesium and calcium contained in the mixed raw material is converted into magnesium oxide or calcium oxide in the adding step. The method for producing a fertilizer using incinerated ash as a raw material according to any one of claims 1 to 8, wherein the composition has a composition containing a component having a molar ratio of 3 to 4 respectively. 10. The incinerated ash has a phosphoric acid content of 10 to 10.
10. The composition according to claim 1, comprising 40% by weight.
A method for producing a fertilizer using the incinerated ash according to any one of the above. 11. The method according to claim 1, further comprising, before the adding step, a step of analyzing a sample of the incinerated ash, determining a rank of the phosphorus fertilizer to be produced based on the analysis result, and determining a component and an additive amount of the additive. A method for producing a fertilizer using the incinerated ash according to any one of claims 1 to 10 as a raw material.