JPWO2020122068A5

JPWO2020122068A5 -

Info

Publication number: JPWO2020122068A5
Application number: JP2020559254A
Authority: JP
Filing date: 2019-12-10
Publication date: 2022-09-09
Anticipated expiration: 2039-12-10

Description

本発明の自然水用肥料は、汚泥灰を原料とし、
リンとケイ素と鉄とを含み、
ケイ素の含有率が２０質量％以上４０質量％以下であり、
重金属の含有率が１０００ｐｐｍ以下であることを特徴とする。 The natural water fertilizer of the present invention uses sludge ash as a raw material,
containing phosphorus, silicon and iron,
The content of silicon is 20% by mass or more and 40% by mass or less,
It is characterized by having a heavy metal content of 1000 ppm or less.

本発明の自然水用肥料では、リンの含有率が１．０質量％以上２０質量％以下であることが好ましい。 In the natural water fertilizer of the present invention, the phosphorus content is preferably 1.0% by mass or more and 20% by mass or less .

本発明の自然水用肥料では、リンの含有率をＸ_Ｐ［質量％］、ケイ素の含有率をＸ_Ｓｉ［質量％］としたとき、１．０≦Ｘ _Ｓｉ／Ｘ _Ｐ ≦５０．０の関係を満足することが好ましい。 In the natural water fertilizer of the present invention, when the phosphorus content is X _P [mass %] and the silicon content is X _Si [mass %] , 1.0 ≤ X _Si /X _P ≤ 50.0 Satisfying relationships are preferred.

Claims

a first dissolving step of mixing sludge ash and an acidic liquid to dissolve heavy metals and phosphorus contained in the sludge ash;
a first solid-liquid separation step of separating and removing the first liquid in which the heavy metal and phosphorus are dissolved from the first solid;
a reactive ionic substance addition step of adding a reactive ionic substance that is a hydroxide and/or salt of an alkali metal and/or a Group 2 element to the first solid;
and a baking step of baking the composition containing the first solid and the reactive ionic substance.

2. The method for producing natural water fertilizer according to claim 1, wherein said reactive ionic substance is a hydroxide and/or salt containing Na and/or Ca.

_3. The nature of claim ₂ , wherein said reactive ionic substance is one or more selected from the group consisting of _Na2CO3 , NaOH, _CaCO3 , Ca(OH) ₂ , CaCl2 and NaCl. A method for producing water fertilizer.

The method for producing a natural water fertilizer according to any one of claims 1 to 3, wherein the firing temperature in the firing treatment is 150°C or higher and 1100°C or lower.

5. The method for producing a natural water fertilizer according to any one of claims 1 to 4, wherein the treatment time of the calcination treatment is 0.5 hours or more and 100 hours or less.

6. The method for producing a natural water fertilizer according to any one of claims 1 to 5, further comprising a reduction step of adding a reducing agent to the first solid and subjecting the first solid to reduction treatment.

7. The method for producing a natural water fertilizer according to any one of claims 1 to 6, further comprising an N component addition step of adding a nitrogen-based fertilizer component into the system after the first solid-liquid separation step. .

8. The method for producing a natural water fertilizer according to any one of claims 1 to 7, further comprising a P component addition step of adding a phosphorus-based fertilizer component into the system after the first solid-liquid separation step. .

The phosphorus-based fertilizer component is
A first precipitation step of mixing the first liquid separated in the first solid-liquid separation step with a precipitation agent and increasing the pH to precipitate a second solid containing the heavy metal and phosphorus;
a second solid-liquid separation step of separating the second solid from a liquid component;
a second dissolving step of dissolving phosphorus contained in the second solid with an alkaline liquid;
9. The production of natural water fertilizer according to claim 8, wherein the second liquid in which phosphorus is dissolved is separated by a method comprising a third solid-liquid separation step of separating the solid component containing the heavy metal. Method.

After the third solid-liquid separation step, the phosphorus-based fertilizer component is mixed with the second liquid with a precipitation agent and the pH is lowered to precipitate a third solid containing phosphorus. 10. The method for producing natural water fertilizer according to claim 9, which is obtained by using a method further comprising steps.

11. The method for producing a natural water fertilizer according to claim 10, wherein the liquid phase has a pH of 2.0 or more and 12.0 or less at the end of the second precipitation step.

12. The method for producing a natural water fertilizer according to claim 10 or 11, wherein an acidic liquid having a pH of -1.0 or more and 2.0 or less is used in said second precipitation step.

13. The method for producing a natural water fertilizer according to any one of claims 10 to 12, wherein the reactive ionic substance is used in the second precipitation step.

Using sludge ash as a raw material,
containing phosphorus, silicon and iron,
The content of silicon is 20% by mass or more and 40% by mass or less,
A natural water fertilizer characterized by having a heavy metal content of 1000 ppm or less.

The natural water fertilizer according to claim 14, wherein the phosphorus content is 1.0% by mass or more and 20% by mass or less .

16. Satisfies the relationship 1.0≦X _Si /X _P ≦50.0, where X _P [mass %] is the phosphorus content and X _Si [mass %] is the silicon content. Fertilizer for natural water according to .