JP2016166115A - Fertilizer comprising reaction product of wood combustion ash and acid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize a wood combustion ash discharged after used as a biomass energy source as a fertilizer in consideration of environment in a recycling society.SOLUTION: There is obtained a fertilizer comprising a reaction product of a wood combustion ash and an inorganic acid exhibiting strong acidity.SELECTED DRAWING: None

Description

The present invention relates to a fertilizer comprising a reaction product of wood combustion ash and acid, and a method for producing the same.

Biomass represents the amount of biological resources and refers to renewable organic resources derived from living organisms. Among them, biomass made of wood is called woody biomass.
Woody biomass mainly consists of branches, leaves, and other forest land left over from logging and lumbering, bark and sawdust from lumber mills, etc. There are types such as pruned branches.

  In recent years, attention has been focused on the use of woody biomass, which is superior in terms of environment, in response to the problem of global warming and the problem of waste. For example, leftovers from sawmills and demolished houses become waste if they are not used, but if they are used effectively as biomass energy, they can reduce waste and help create a recycling-oriented society. I can expect. In addition, thinned wood, etc., is used by using unused local resources as energy, creating new industries and employment such as collection and transportation of resources, management and operation of biomass energy supply facilities and utilization facilities, etc. It also contributes to regional revitalization.

  Woody biomass is used as a source of biomass energy in this way, but in facilities such as power generation facilities, it is converted to ash if it is used for combustion in incinerators such as boilers. There is no choice but to dispose of it.

  Regarding recycling of combustion ash, as conventional techniques, there are chemical fertilizers obtained by reacting phosphoric acid with plant ash (Patent Document 1) and fertilizers obtained by reacting chicken manure combustion ash with phosphoric acid (Patent Document 2). known. However, these combustion ash has a low specific gravity and is liable to generate dust, which is not preferable in terms of work hygiene. In addition, when the combustion ash is actually used as a fertilizer, the reaction product is required to be granulated without remaining fine powder. That is, by increasing the granulating property, fertilization unevenness is suppressed, the growth of the cultivated plant is stabilized, and the handleability of the fertilizer is improved. Furthermore, the height of the fertilizer component is calculated | required by combustion ash. In particular, if it is derived from plants, potassium is included, but considering fertilization efficiency, it is desirable that the combustion ash used as a fertilizer raw material has a higher fertilizer component.

JP-A-11-157975 JP 2005-126252 A

  This invention pays attention to the wood combustion ash utilized as biomass energy, and makes it the subject which tries to solve that it can consider the environment in a recycling society, and can be used effectively, without discarding the said wood combustion ash as waste. .

  As a result of diligent research to solve the above problems, the present inventors have found that a fertilizer using a reaction product obtained by reacting a wood burning ash with a strongly acidic inorganic acid exhibits an excellent effect. The present invention has been completed.

  A fertilizer using a reaction product obtained by reacting woody combustion ash with an inorganic acid that exhibits strong acidity is excellent in granulation properties, improves the fertilization efficiency, and improves the ease of handling during fertilization. Moreover, fertilization efficiency can also be raised by containing many potassium components. In particular, when woody biomass is used as a biomass energy source in a facility such as a power generation facility, a large amount of combustion ash is discharged after combustion in an incineration facility such as a boiler, and this can be used effectively.

  The wood-burning ash used in the present invention is an ashed product obtained by burning wood bark, wood ends, sawdust, thinned wood chips, etc., and any wood-derived ash can be used. Any kind of tree such as cedar, pine, bamboo shoot and bamboo can be used.

  Any wood combustion ash can be used as described above, but wood combustion ash discharged after combustion in an incinerator such as a boiler in a facility such as a power generation facility is preferable. In other words, the wood combustion ash obtained from the power generation facility is performing the combustion process step by step, and by following this process, fine powder can be obtained, and the subsequent process in the present invention. Is preferable for obtaining a highly granulated fertilizer, and also contains a lot of potassium components. As the particle size of the woody combustion ash, the particle size distribution of less than 1 mm is preferably 80% or more, and the particle size distribution of less than 500 μm is particularly preferably 80% or more.

  The woody combustion ash exhibits alkalinity, and in the present invention, the woody combustion ash is then subjected to a neutralization treatment step with an acid. As an acid, an inorganic acid can be used among those which show strong acidity, a neutralization reaction can be efficiently performed, and appropriate granulation properties can be provided. Examples of the inorganic acid include phosphoric acid, phosphorous acid, sulfuric acid, nitric acid, etc. Among these, it is preferable to use phosphorous acid having a mild reaction in terms of handleability in the process. That is, there is an exothermic reaction in this neutralization step, and foaming occurs in the tank, but the degree of danger in terms of safety and health increases depending on the magnitude of the degree. Further, in proportion to the intensity of the reaction, the adhesion of the reactants to the apparatus increases and the yield decreases. In the addition of phosphorous acid, the reaction is gentle, reducing these disadvantages, and increasing the uniformity of the granulation properties of the resulting reaction product. In order for the inorganic acid to react efficiently and bring about high granulation properties, it is preferable to use a solution having a certain concentration or more, and it is preferable to use a solution of 1 mol / L or more. Thereby, the time of a subsequent drying process can be shortened.

  In the neutralization treatment step, an acid is added in a ratio of 70:30 to 50:50 to the wood combustion ash. By treatment at this ratio, a reaction product having a neutral pH is obtained. The wood-burning ash is put into a stirrer, and acid is added while stirring. The addition is gradually performed while observing the state of intense foaming caused by the reaction. The apparatus used for stirring can be used for any type and shape as long as it can be mixed and stirred. For example, a container-fixed ribbon type, paddle type, or container rotating type mixer can be used. Screw conveyors, paddle mixer conveyors, etc. can be used. After adding the whole amount, leave it still and wait for the pH to stabilize. Thereafter, the reaction product is dried to remove moisture.

  The reaction product obtained by reacting the woody combustion ash of the present invention with a strongly acidic inorganic acid can be used as it is as a fertilizer, but other fertilizer raw materials are appropriately selected and mixed with these. Chemical fertilizer, compound fertilizer, liquid fertilizer can also be used.

(Reactivity test)
In the power generation system, wood combustion ash discharged after combustion was prepared using cedar oga and bark as combustion sources. Table 1 shows the temporary specific gravity and particle size distribution of the wood combustion ash, and Table 2 shows the component analysis. This was reacted with inorganic acids (phosphoric acid: concentration 75% (WP54%), phosphorous acid: concentration 70% (WP61.6%), sulfuric acid: concentration 70%) in the proportions shown in Table 3 and stirred. It was. The table at the time of reaction and chemical data after standing are shown in the same table.

  In any of the reactants, the granule was granulated, and had a shape suitable for use as a fertilizer or blended with it to be used as a fertilizer. Furthermore, although all were in the state of powder particle mixing, the state where the water content was about 10% or slightly exceeded was low in the degree of powder and having a moderate wet feeling. In addition, foaming occurred at the time of the addition of the inorganic acid and did not affect the reaction product. However, the reaction of Test No. 3 was the most preferable in the working process.

(Cultivation test)
The cultivation test was conducted in triplicate by the method shown below.
A 1L pot was filled with 1L of alluvial soil and fertilized with ammonium sulfate so that N would be 150mg / kg. Furthermore, among the wood combustion ash reactants obtained in Example 1, No. 1, 3 and 6 reactants (component analysis values are as shown in Table 4), potassium chloride as a control, 75 as K ₂ O, respectively. 150 and 225 mg / kg were applied.

In each pot, 3 komatsuna seeds were sown in 4 places and cultivated. Two strains after thinning were examined for harvest on day 54 after sowing. In the same manner as described above, a test group and a control group were provided, and 3 seeds of spinach seeds were sown in 4 places in each pot for cultivation. Two strains after thinning were examined for harvest on day 54 after sowing.
The test results are shown in Table 5.

  In all the test plots, the dry matter weight exceeded the control potash chloride, and the potash absorption was equal or higher.

  The fertilizer which uses the reaction material obtained by making the inorganic acid which shows strong acidity to the woody combustion ash of this invention has high granulation property, and is rich in a potassium component. In a recycling-oriented society, waste can be reduced to reduce the burden on the environment and can be used effectively in the agricultural industry.

Claims (13)

A fertilizer comprising a reaction product obtained by reacting woody combustion ash with an inorganic acid having strong acidity. 2. The fertilizer according to claim 1, wherein the woody combustion ash is an ashed product obtained by burning wood bark, wood ends, sawdust and / or thinned wood chips. The fertilizer according to claim 1 or 2, wherein the wood combustion ash is recovered after burning the wood combustion source in the steam power generation system. The fertilizer according to any one of claims 1 to 3, characterized in that it uses wood-burning ash having a particle size distribution of less than 1 mm and a particle size distribution of 80% or more. The fertilizer according to any one of claims 1 to 4, wherein the burned wood ash has a particle size distribution of less than 500 µm and a particle size distribution of 80% or more. The fertilizer according to any one of claims 1 to 5, wherein the strongly acidic inorganic acid is one or more selected from phosphoric acid, phosphorous acid, sulfuric acid and nitric acid. The fertilizer according to claim 1, wherein the inorganic acid exhibiting strong acidity is phosphorous acid. The manufacturing method of the fertilizer obtained by making the inorganic acid which shows strong acidity to woody combustion ash react. The method for producing a fertilizer according to claim 8, wherein wood combustion ash having a particle size distribution of less than 1 mm and a particle size distribution of 80% or more is used. The method for producing a fertilizer according to claim 8 or 9, characterized by using woody combustion ash having a particle size distribution of less than 500 µm and a particle size distribution of 80% or more. 11. The method for producing a fertilizer according to claim 8, wherein the inorganic acid exhibiting strong acidity is one or more selected from phosphoric acid, phosphorous acid, sulfuric acid and nitric acid. The method for producing a fertilizer according to claim 8 or 11, wherein the inorganic acid exhibiting strong acidity is phosphorous acid. The method for producing a fertilizer according to claim 8, wherein the fertilizer is produced using an aqueous solution having a concentration of 1 mol / L or more as an inorganic acid exhibiting strong acidity.