JP2022042242A - Method of manufacturing recycled article of ash and system for manufacturing recycled article of ash - Google Patents

Abstract

To provide a method of manufacturing a recycled article of ash which is managed at an appropriate environmentally-regulated material concentration, even when fluctuation is caused in the state of ash.SOLUTION: Concerning a method of manufacturing a recycled article of ash in which an environmentally-regulated material concentration is managed, the method of manufacturing the recycled article of ash includes an analysis process (S11) of analyzing an element concentration of ash used in the recycled article of ash, a calculation process (S21) of calculating a raw material concentration for setting the environmentally-regulated material concentration of the recycled article of ash so as to be a managed value or less, with respect to element concentration of the ash analyzed in the analysis process, based on an estimation relation of concentration correlation provided by performing multivariate analysis by using element concentration of ash, the raw material concentration of raw material to be used for the recycled article and the environmentally-regulated material concentration of the recycled article of ash provided by combination of these as teacher data, and a mixing process (S31) of mixing the raw material at a raw material concentration calculated in the calculation process.SELECTED DRAWING: Figure 2

Description

The present invention relates to a method for producing a recycled ash product by reducing environmentally regulated substances in the ash, and a system for producing a recycled ash product.

Thermal power generation is also performed at power plants such as electric power companies and various factories, and is an important power source. Various fuel sources such as coal and biomass are used for this thermal power generation, and incinerator ash is generated with the power generation. In addition to thermal power generation, incineration ash is also generated when used as a heat source or when incinerating waste.

These incinerator ash may also contain environmentally regulated substances such as heavy metals. The final disposal of incinerated ash includes landfill processing and use for building materials such as cement. Before performing this final disposal, it is necessary to treat the incinerator ash with environmentally regulated substances.

The main ash and fly ash of the incinerated ash that remains after being incinerated, which are also used as appropriate fuels, are used as cinders, soot and dust, etc., depending on their origin, condition, treatment facility, treatment status, reuse destination, etc. Laws and regulations are in place. Then, when trying to reuse these ashes, various treatment methods for environmentally regulated substances have been proposed and implemented.

Patent Document 1 classifies heavy metal-containing fly ash based on the amount of calcium in the heavy metal-containing fly ash and the pH of the heavy metal-containing fly ash suspended aqueous solution, and corresponds to the type of the classified heavy metal-containing fly ash. The solidification of heavy metal-containing fly ash is characterized by using either a) siliceous substance, b) Irwin-based cement, or c) Irwin-based cement or pH-reducing material. The processing method is disclosed.

Patent Document 2 discloses a method for treating heavy metal-containing ash, which comprises immobilizing heavy metals in heavy metal-containing ash by adding water and activated carbon to heavy metal-containing ash and kneading them.

According to Patent Document 3, when a heavy metal fixing agent containing an aqueous solution of dithiocarbamate as a main component is used for fly ash treatment, the pH of the diluted solution when the fixing agent is diluted with water is 12 or more. Disclosed is a method for treating fly ash containing a harmful heavy metal, which is characterized by being kneaded with fly ash and then treated.

In Patent Document 4, water is added to heavy metal-containing ash, an acid or an alkali containing an OH group is added to adjust the pH to 9 to 12, and then an acid and ferrous iron are added to adjust the pH of this mixture to 6.0 to 8.5. Discloses a method for treating heavy metal-containing ash, which is characterized by the above.

Japanese Unexamined Patent Publication No. 9-108649 Japanese Unexamined Patent Publication No. 9-174017 Japanese Unexamined Patent Publication No. 10-18612 Japanese Unexamined Patent Publication No. 7-108248

Various ash treatment techniques have been proposed as in Patent Documents 1 to 4. However, ash is a variety of waste such as coal, wood, industrial waste, and household waste, which are treated under various conditions depending on the purpose of incineration and the environment. Therefore, if the type of ash changes or fluctuations occur over time, the treatment conditions may not be appropriate. If the treatment is continued under such inappropriate conditions, it may be discharged in a state that does not satisfy the environmental standard, ash that cannot be discharged may be accumulated, or the treatment may have to be repeated.

Under such circumstances, it is an object of the present invention to provide a method and a system for producing a recycled ash product controlled at an appropriate concentration of environmentally regulated substances even if the state of the ash fluctuates.

As a result of diligent research to solve the above problems, the present inventor has found that the following invention meets the above object, and has arrived at the present invention. That is, the present invention relates to the following invention.

<1> A method for manufacturing recycled ash with controlled concentration of environmentally regulated substances.
An analysis process that analyzes the elemental concentration of ash used in recycled ash products,
Based on the concentration correlation prediction formula obtained by multivariate analysis using the element concentration of ash, the material concentration of the material used for the recycled product, and the environmentally regulated substance concentration of the recycled ash product obtained by these combinations as teacher data. In addition, a calculation step of calculating the material concentration for keeping the concentration of the environmentally regulated substance of the recycled product of the ash below the control value with respect to the element concentration of the ash analyzed in the analysis step.
A method for producing a recycled ash product, which comprises a mixing step of mixing the materials at the material concentration calculated by the calculation step.
<2> The elements of ash analyzed in the analysis step are Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Ni, Cu, Zn, As, Se, The method according to <1> above, which analyzes 5 or more elements selected from the group consisting of Br, Ag, Cd, and Pb.
<3> The method according to <1> or <2>, wherein the material is ash, a solidifying material, water, and a chemical.
<4> The chemicals are gypsum, lime, calcium chloride, sodium sulfide, ferric chloride, ferric polysulfate, sodium silicate, sodium aluminate, calcium aluminate, aluminum hydroxide, aluminum dross, and organic. The method according to <3> above, which is one or more agents selected from the group consisting of chelating agents.
<5> Environmentally regulated substances are F (fluorine), Hg (mercury), Cd (cadmium), Pb (lead), Cr ⁶⁺ (hexavalent chromium), As (arsenic), Se (selenium), and B ( The method according to any one of <1> to <4>, which is selected from the group consisting of (boron).
<6> A system for manufacturing recycled ash products with controlled concentrations of environmentally regulated substances.
Analytical means for analyzing the elemental concentration of ash used in recycled ash products,
Based on the concentration correlation prediction formula obtained by multivariate analysis using the element concentration of ash, the material concentration of the material used for the recycled product, and the environmentally regulated substance concentration of the recycled ash product obtained by these combinations as teacher data. In addition, a calculation means for calculating the material concentration for keeping the concentration of the environmentally regulated substance of the recycled product of the ash below the control value with respect to the element concentration of the ash analyzed in the analysis step.
A system for producing a recycled ash product, which comprises a mixing means for mixing the materials at the material concentration calculated by the calculation step.

According to the method and system of the present invention, it is possible to produce a recycled ash product controlled at an appropriate concentration of environmentally regulated substances.

It is a figure which shows the composition example of ash. It is a figure which shows an example of the flow for performing the manufacturing method of this invention. It is a figure which shows an example of the structure which concerns on the manufacturing system of this invention. It is a figure which shows another example of the structure which concerns on the manufacturing system of this invention.

Hereinafter, embodiments of the present invention will be described in detail, but the description of the constituent elements described below is an example (representative example) of the embodiments of the present invention, and the present invention is described below unless the gist thereof is changed. It is not limited to the contents of. In addition, when the expression "-" is used in this specification, it is used as an expression including numerical values before and after it.

[Method for manufacturing recycled ash of the present invention]
The method for producing a recycled ash product of the present invention is based on an analysis step of analyzing the elemental concentration of ash used in the recycled ash product, the elemental concentration of ash, the material concentration of the material used in the recycled product, and a combination thereof. Based on the concentration correlation prediction formula obtained by multivariate analysis using the concentration of environmentally regulated substances in the obtained recycled ash as teacher data, the ash is compared with the element concentration of the ash analyzed in the analysis step. It has a calculation step of calculating the material concentration for keeping the concentration of the environmentally regulated substance of the recycled product below the control value, and a mixing step of mixing the material with the material concentration calculated by the calculation step. In the present application, the method for producing a recycled ash product of the present invention may be simply referred to as the production method of the present invention.

The production method of the present invention is for producing a recycled ash product in which the concentration of an environmentally regulated substance is controlled. According to the production method of the present invention, even if the state of ash fluctuates, it is possible to obtain a recycled ash product controlled at an appropriate concentration of environmentally regulated substances.

[System for manufacturing recycled ash of the present invention]
The system for producing a recycled ash product of the present invention is based on an analytical means for analyzing the elemental concentration of ash used in the recycled ash product, the elemental concentration of ash, the material concentration of the material used in the recycled product, and a combination thereof. Based on the concentration correlation prediction formula obtained by multivariate analysis using the concentration of environmentally regulated substances in the obtained recycled ash as teacher data, the ash is compared with the element concentration of the ash analyzed in the analysis step. It has a calculation means for calculating the material concentration for reducing the concentration of the environmentally regulated substance of the recycled product to the control value or less, and a mixing means for mixing the material with the material concentration calculated by the calculation step. In the present application, the system for producing a recycled ash product of the present invention may be simply referred to as the production system of the present invention.

The manufacturing system of the present invention manufactures a recycled ash product in which the concentration of an environmentally regulated substance is controlled. According to the manufacturing system of the present invention, even if the state of ash fluctuates, it is possible to obtain a recycled ash product controlled at an appropriate concentration of environmentally regulated substances.

It should be noted that the manufacturing method of the present invention can also be performed using the manufacturing system of the present invention in the present application, and the configurations corresponding to the respective can be mutually used in the present application.

Incinerated ash such as fuel and garbage used for thermal power generation and hot water boilers is classified into main ash, fly ash, cinders, soot and dust, etc. according to the fuel source and combustion method. The state will be different.

It is necessary to comply with environmental regulations when landfilling or reclaiming for these final disposals. Environmental regulations are in place because fluorine and heavy metals may be detected in these ash. Various ash treatment methods have been proposed, but in many cases, a single method can sufficiently comply with environmental regulations with a typical system of ash. However, in the actual field, even if processing is performed under steady-state conditions, it may not be possible to control within environmental regulations or voluntary standards.

Conventionally, the proposed ash treatment method has focused on a specific heavy metal for a specific type of ash, for example, reducing hexavalent chromium in coal ash. However, as described above, the composition of the actual ash varies greatly depending on the type, burning method, lot, and the like. Furthermore, many of these differences in composition can affect reactivity such as ionization tendency, pH, solubility, and solubility product. In addition, many of them are subject to environmental regulations, and different treatment conditions and chemicals are required for each.

On the other hand, ash used in a single business establishment is often treated with the recognition that the composition is basically limited. For this reason, there has been no accumulation of knowledge on how to deal with unsteady objects being mixed in or variations over time such as treatment dates and seasons. The present inventors have investigated the causes of such problems and their countermeasures by analyzing the ash recovered from various sites.

The present inventors focused on the relationship with the treatment status of environmentally regulated substances such as heavy metals and fluorine depending on the ash and the chemicals used. As a result, the following studies were carried out based on the conditions for producing a recycled ash product, and the knowledge according to the present invention was obtained.

Multivariate analysis was performed using the elemental concentration of ash, the material concentration of the material used for the recycled product, and the environmentally regulated substance concentration of the recycled ash product obtained by the combination as teacher data. It was found that the prediction formula for the concentration correlation obtained by this multivariate analysis is actually highly reproducible even when a known value or a set value is input and used. Therefore, by using this prediction formula, the element concentration of the ash to be treated and the concentration of the environmentally regulated substance to be controlled can be set, and the material concentration for that purpose can be efficiently grasped.

Then, using this prediction formula, ash that has not been treated, such as those that have not been used by the business operator in the past or those that have been experimentally mixed, was treated. Even in such a treatment, it was possible to obtain a recycled ash product in which the concentration of environmentally regulated substances was controlled by utilizing the analysis result of the component concentration related to the composition. This is because various elements of ash affect the reaction, prevent competition between drugs, suppress the use of excess drugs, etc. to find a range to comprehensively adjust. it is conceivable that. The present invention is based on such findings.

Regarding the findings for the present invention, FIG. 1 shows the composition of coal ash and biomass ash when XRD analysis is performed. Si (silica) is the main component of coal ash, and Al, Ca, Fe, K, Ti, S, P and the like are also detected. On the other hand, in the biomass ash, Ca (calcium) is the main component, and K, Si, Fe, S, Mg, Al, P, Mn and the like are detected. Thus, the composition is very different even if it is simply called ash. In addition, the composition of coal ash and biomass ash varies, and the composition when other fuel sources are used is also different. In addition, these mixed-burning ash and the like may occur. It is considered that the present invention can efficiently find treatment conditions based on the influence of such compositions having significantly different component concentrations.

[Embodiment of the manufacturing method of the present invention]
FIG. 2 is a diagram showing an example of a flow for manufacturing a recycled ash product of the present invention. In the production method of the present invention, step S11 for analyzing the element concentration of ash according to the analysis step is performed, step S21 for calculating the material concentration from the prediction formula for the calculation step, and step S31 for mixing at the material concentration according to the mixing step. Can be. A mixture of materials can be recycled, for example, by expanding it to the place where it is used and curing it, or by curing it in a mold.

[Analysis process]
The production method of the present invention includes an analysis step for analyzing the elemental concentration of ash used in a recycled ash product. The elemental components of the ash to be analyzed are the elements that make up the ash used in production. For the analysis, the one that can obtain a sufficient correspondence between the time when it is used as the teacher data at the stage of creating the prediction formula and the time when the analysis process is performed is adopted. Therefore, either use a common analysis method when creating the prediction formula and when performing the analysis process, or use one with a high numerical correlation or correspondence. For example, XRF (X-ray fluorescence) analysis can be performed.

The elements for which the elemental concentration of ash is analyzed in the analysis step are Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Ni, Cu, Zn, As, Se, Br. , Ag, Cd, and Pb are preferably analyzed for 5 or more elements selected from the group. The number of elements may be 7 or more, 8 or more, 10 or more, and 12 or more. Although it is not necessary to set an upper limit, an upper limit of 20 or less or 18 or less may be set because elements that are hardly detected in ash are considered to have a slight influence on the prediction formula. Further, this number may be set in order from the one having the highest concentration detected as an element. In particular, among these, it is preferable that at least Si, Al, Ca, K, and Fe are contained. Further, it is more preferable that Cr, Pb, As, Se, and Cd are also contained.

For example, the element concentration of ash is analyzed by XRF (fluorescent X-ray), the amount of elements with atomic numbers of Na (atomic number: 11) or higher is measured, and the value calculated as the ratio of each element in it is used. be able to. For example, in elemental analysis (XRF), "JSX-1000s" manufactured by JEOL Ltd. can be used to analyze the elemental concentration of ash.

It is also effective to analyze and measure information on ash and conditions that affect reaction conditions. For example, as information on ash, it is preferable to measure the bulk specific density and the particle size. In addition, it is preferable to measure the air temperature as a factor that affects the reaction conditions.

[Calculation process]
The production method of the present invention is obtained by multivariate analysis of the element concentration of ash, the material concentration of the material used for the recycled product, and the environmentally regulated substance concentration of the recycled ash product obtained by combining these as teacher data. Calculation to calculate the material concentration to keep the concentration of environmentally regulated substances in the recycled ash product below the control value with respect to the element concentration of the ash analyzed in the analysis step based on the concentration correlation prediction formula. Has a process.

[Prediction formula setting]
In order to perform the calculation process, "elemental concentration of ash" and "concentration of environmentally regulated substances in recycled ash (concentration of recycled product) set as control values)" are set as explanatory variables, and "concentration of material used in recycled product (concentration of recycled product)". Multivariate analysis with "material concentration)" as the objective variable is performed to construct a predetermined map (for example, search space). This is used as a prediction formula for the elemental concentration of ash and the material concentration with respect to the concentration of recycled products.

Multivariate analysis is a method for summarizing the characteristics of multivariate (other types of characteristic values) data that are related to each other and integrating them according to the purpose.

The multivariate analysis includes the following (1) to (3) and the like. It also includes those that are applied by combining them as appropriate. Which of these methods should be adopted may be selected as an acceptable prediction formula obtained by using the multivariate analysis. (1) Multiple regression analysis and canonical correlation analysis used for finding relational expressions and estimating quantities, and response surface methodology to which these methods are applied. (2) Cluster analysis and discriminant analysis used for sample classification and quality estimation. (3) Principal component analysis and factor analysis used for integrated organization (reduction) of multivariates, classification of variables, and discovery of representative variables.

f (elemental concentration of ash, concentration of material) → Concentration of recycled product ・ ・ ・ Equation (1)
In the process of creating the prediction formula, the concentration of the recycled product is obtained based on the elemental concentration of ash and the concentration of the material, as in formula (1), according to the work flow for manufacturing the recycled product. You may create something that grasps the sex.

f'(elemental concentration of ash, concentration of recycled product) → Concentration of material ・ ・ ・ Equation (2)
In the manufacturing method of the present invention and the manufacturing system of the present invention, the element concentration of the ash to be treated is analyzed in the analysis step, the concentration of the recycled product is set in advance, and the concentration of the corresponding material is obtained. Set the prediction formula of 2). The teacher data for creating the prediction formula can be created based on the model test for performing the prediction formula in advance. Further, the result obtained by performing the manufacturing method of the present invention or the like may be further used as teacher data for continuous learning.

Further, the prediction formula may include information on ash and information on reaction conditions as variables for analysis. In particular, it is preferable to use the bulk density of the ash and the air temperature at the time of reaction in addition to the component concentration of the ash. By using these, it is possible to obtain a recycled ash product in which the concentration of the environmentally regulated substance is controlled with higher accuracy.

[Recycled ash]
The ash was formed by solidifying it in a mold, granulating, solidifying, crushing, etc., using a solidifying agent, etc., in a state where the environmentally restrictive substances contained in the ash were treated so as not to elute. It can be used as a recycled product such as artificially recycled crushed stone. This recycled product can be shaped so as to correspond to, for example, stone, sand, soil, rock, concrete block, roadbed material, or the like.

[material]
The material is used to recycle ash. The recycled product is appropriately set according to the mode of the recycled product. Recycled products are typically solidified artificially regenerated crushed stones. The ash itself is also a material because it is used in recycled products. Targets for setting the material concentration are, for example, solidifying materials such as ash and cement, water, and chemicals. That is, the calculation step calculates the amount of ash, the amount of solidifying material, the amount of water, and the amount of chemicals when manufacturing a recycled product.

[Drug]
The chemical is used as a material for adjusting the degree of solidification and preventing the elution of environmentally regulated substances in ash when manufacturing recycled products. The drug is appropriately selected depending on the type of recycled product. As the drug, a salt-based drug, an iron-based drug, a sodium silicate-based drug, an aluminometer drug, a chelate-based drug, a sulfuric acid-based drug, a polymer-based drug, a combination thereof, or the like can be used. More specifically, gypsum, lime, calcium chloride, sodium sulfide, ferric chloride, ferric polysulfate, sodium silicate, sodium aluminate, calcium aluminate, aluminum hydroxide, aluminum dross, organic chelating agents. , PAC (polyaluminum chloride), one or more agents selected from the group consisting of a sulfate band, and the like can be used. These may use 2 or more types, 3 or more types, or 4 or more types.

[Environmentally regulated substances]
In the ash regeneration process, it is required that the concentration of environmentally regulated substances be a predetermined level. Various laws and regulations are set for this environmentally regulated substance. The control value of the concentration of environmentally regulated substances in the recycled ash product in the present invention may be the concentration itself according to various laws and regulations, or the concentration lower than the concentration of various laws and regulations by setting a safety factor is controlled in the usage environment. It may be a value.

Environmentally regulated substances include, for example, F (fluorine), Hg (mercury), Cd (cadmium), lead (Pb), Cr ⁶⁺ (hexavalent chromium), As (arsenic), Se (selenium), and B (boron). ) Can be selected from the group. All of these may be environmentally regulated substances for which control values are set. Alternatively, the substance detected in the analysis step may be used as an environmentally regulated substance for which a control value is set. Alternatively, substances that are highly necessary to be controlled in consideration of the background of ash generation may be used as environmentally regulated substances for which control values are set. The environmentally regulated substances to be controlled may be 1 or more, 2 or more, 3 or more, and 4 or more.

[Mixing process]
The production method of the present invention includes a mixing step of mixing the materials at the material concentration calculated by the calculation step. The mixing is carried out in a predetermined order of production thereof, depending on the type of the recycled product. A recycled product can be obtained by performing this mixing, installing it in a use environment in a mixed state and curing it, or appropriately molding it.

[Example of an embodiment of a manufacturing system]
FIG. 3 is a diagram showing a manufacturing system 100 which is an example of the configuration according to the manufacturing system of the present invention. The manufacturing system 100 includes an analysis means 1, a calculation means 2, and a mixing means 3. Further, it has a storage unit 4 for storing data and the like used for these purposes.

The manufacturing system 100 is a system for manufacturing recycled ash products in which the concentration of environmentally regulated substances is controlled. The analysis means 1 is a means for analyzing the elemental concentration of ash used in the recycled ash product. The calculation means 2 is a material concentration corresponding to the element concentration of ash analyzed by the analysis means 1 and the control value of the environmentally regulated substance concentration of the recycled product based on the prediction formula stored in the storage unit 4 in advance. Is calculated. The mixing means 3 mixes ash and recycled ash materials such as water, solidifying material, and chemicals based on the calculation result of the calculating means 2.

[Mixing process]
FIG. 4 is a diagram showing a manufacturing system 101 which is another example of the configuration according to the manufacturing system of the present invention. The manufacturing system 101 has a configuration in which the unit 51 related to the analysis means 1 and the mixing means (mixing tank 30 and the like) and the unit 52 related to the calculation means 2 are provided at different locations.

The unit 51 has a configuration related to a mixing means such as an analysis means 1 and a mixing tank 30. These are the units corresponding to the means that require direct handling of the ash. Therefore, the unit 51 is provided in a factory or a power plant where ash is generated, or a recycling factory that collects and regenerates them. On the other hand, the unit 52 is a calculation means 2 or the like, and these are related to a configuration as long as information related to the material concentration or the like can be transmitted so that the mixing means can use it based on the analysis result of the analysis means. Can be managed separately from the unit 51 at a facility for central control or the like.

In the unit 51, the analysis means 1 analyzes the elemental concentration of the ash of the ash 10. The information of the analysis result is transmitted to the communication means 21 of the unit 52 via the communication means 11 by any method such as wired or wireless. Further, the result calculated by the unit 52 and the like are transmitted from the communication means 21 to the communication means 11, and mixing is performed based on the information. The mixing tank 30 is a tank for mixing materials. The ash 10 is mixed by adding an amount designated as a material amount to the mixing tank 30 by using the adjusting means 31 for adjusting the mixing amount of the ash. Further, regarding other materials, the materials contained in the material tanks 321, 331, 341 are mixed tanks based on the information calculated by the calculation means 2 by using the adjustment means 32, 33, 34 corresponding to each. 30 is added and mixed. These adjusting means 31 to 34 may be combined with a monitor that displays the amount of material to be mixed, a feeder, a pump, a controller, and the like that send various materials to the mixing tank 30.

In the unit 52, the calculation means 2 calculates the material concentration. Further, the information received by the communication means 21, the prediction formula for performing the calculation by the calculation means 2, the material density of the calculation result, and the like can be appropriately stored in the storage unit 4. The material concentration calculated by the calculation means 2 is transmitted to the communication means 11 via the communication means 21 as described above, and is used as information for controlling the adjustment means 31 to 34. Such a configuration related to the unit 51 and the unit 52 can be realized by appropriately assembling a personal computer, a server, a portable terminal, various communication systems, and the like.

By providing the configuration related to the unit 52 separately from the unit 51, various advantages can be obtained. For example, if the information corresponding to the unit 52 can be displayed and managed, the actual ash processing can be managed by remote control. Further, the unit 51 is required to be installed at each site where the ash is regenerated. On the other hand, the unit 52 may be interlocked with a plurality of units 51. If it is linked with such a plurality of units 51, it is possible to collect and manage information on places where the types of ash are significantly different. Therefore, even if ash that is unsteady and difficult to process is generated for a specific unit 51, it is easy to calculate and provide information for appropriate processing thereof. Further, by continuously learning the data related to these plurality of units 51 as teacher data, a more reliable manufacturing system 101 can be obtained.

In the manufacturing system of the present invention, a unit 52 related to the calculation means 2 is installed in a company or the like that analyzes treatment conditions, and a partner company or the like that is affiliated for ash treatment or the like wants to carry out a business of manufacturing recycled ash products. Occasionally, the unit 51 can be introduced. Ash treatment is widespread and diverse, and there is a demand for a variety of ash. By using the manufacturing system of the present invention and performing such an operation, a local company or the like in the vicinity thereof can measure the ash corresponding to the unit 51, detoxify the ash, and regenerate the ash in response to these demands. It is possible to commercialize the product. At this time, by using the processing conditions and the like collected by the unit 52, it is possible to reduce the examination time and cost for introducing the ash processing equipment and technology. This is also very useful for related partner companies such as ash emitters and processors.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples unless the gist thereof is changed.

[Example 1]
For recycled ash including tire ash, we measured the concentration of environmentally regulated substances with respect to the material concentration of the recycled product and tried to understand the correlation with the material concentration. In the untreated state, lead (Pb), hexavalent chromium (Cr ⁶⁺ ), fluorine (F), and selenium (Se) may be particularly detected among the environmentally regulated substances in this ash.

The elemental concentration of ash, the combination of materials for producing crushed stone as a recycled product, and the concentration of the elution environment regulated substance in the recycled product at that time were measured under 47 experimental conditions.

-Elemental concentration of ash The elemental concentration of ash is Na, Mg, Al, Si, P, S, Cl, K, Ca, Mn, Fe, Ni, Cu, Zn, As, Se, Br, Ag, Cd, Pb. As a measurement target, "JSX-1000s" manufactured by JEOL Ltd. was used, and the measurement conditions were: tube voltage 50 kV, filter ND, and collimator 9. In this system, Cl, Ni, As, and Cd were not detected.

In this test system, as the measurement results of the element concentration, for example, Ca is 41% to 65% (average 56%), Pb is 0.0009% to 0.084% (average 0.043%), and Cr is 0. Examples thereof include 0012% to 0.049% (average 0.025%). The bulk density of the ash was 0.55 to 0.80 (average 0.70).

-Material concentration In the test system, ash was 100 parts by mass, cement was 28 parts by mass to 52 parts by mass (40 parts by mass on average), and FeCl ₃ was 0.27 parts by mass to 6.9 parts by mass (average 3). .6 parts by mass), Na ₂ SiO ₃ was 0 parts by mass to 5.1 parts by mass (1.5 parts by mass on average), and 60 parts by mass to 100 parts by mass of water (80 parts by mass on average). The concentrations of such materials were mixed at a temperature of about 24 ° C. and then cured.

-Concentration of environmentally regulated substances in recycled products In the test system, Pb eluted from recycled products was 0 mg / L (below the lower limit of detection) to 0.016 mg / L (average 0.0052 mg / L), and hexavalent chromium was 0.013 mg / L to 0.22 mg / L (average 0.07 mg / L), fluorine 0.15 mg / L to 0.79 mg / L, selenium 0.001 mg / L to 0.003 mg / L (average 0) It was .002 mg / L).

Forty-seven examples of this test system are used as teacher data, and the element concentration of ash, the concentration of the material, and the concentration of environmentally regulated substances are used as teacher data. A prediction formula was created by multivariate analysis by the response surface methodology using the Science and Technology Training Institute). As for the prediction formulas, the hardness, lead elution, and hexavalent chromium elution prediction formulas were created for those with cement as the solution, those with Na ₂ SiO ₃ as the solution, and those with FeCl ₃ as the solution, and these were satisfied at the same time. The prediction formula (A1) used for mixing was used.

-Manufacturing of recycled products using the prediction formula For the three samples of new ash for which the regeneration treatment was examined, the elemental concentration of the ash was measured by the same means as the test system used for the above-mentioned examination of the prediction formula. Using the measured data, a control value was set for the concentration of the environmentally regulated substance, and the material concentration was calculated by the prediction formula (A1). As a result of manufacturing recycled products by mixing the materials based on the calculation results, the concentrations of the environmentally regulated substances were less than or equal to the values set as the control values.

[Example 2]
Attempts to measure the concentration of environmentally regulated substances with respect to the material concentration of recycled products and to understand the correlation with the material concentration, targeting recycled ash products including mixed ash that is obtained by mixing and burning biomass ash and coal. rice field. In the untreated state, this ash is especially when lead (Pb), hexavalent chromium (Cr ⁶⁺ ), fluorine (F), selenium (Se), and boron (B) are detected among the environmentally regulated substances. was there.

The elemental concentration of ash, the combination of materials for producing crushed stone as a recycled product, and the concentration of the elution environment regulated substance in the recycled product at that time were measured under 27 experimental conditions.

-Elemental concentration of ash The elemental concentration of ash is Na, Mg, Al, Si, P, S, Cl, K, Ca, Mn, Fe, Ni, Cu, Zn, As, Se, Br, Ag, Cd, Pb. As a measurement target, "JSX-1000s" manufactured by JEOL Ltd. was used, and the measurement conditions were: tube voltage 50 kV, filter ND, and collimator 9.

In this test system, as the measurement result of the element concentration, for example, Al is 9.4% to 11.5% (10.5%), Si is 26.3% to 34.6% (average 29.5%). , Ca is 20.1% to 27.9% (average 24.1%), Pb is 0.137% to 0.952% (average 0.223%), and the like. The bulk density of the ash was 0.4 to 0.80 (average 0.69).

-Material concentration In the test system, ash is 100 parts by mass, cement is 15 parts by mass to 55 parts by mass (35 parts by mass on average), and water is 60 parts by mass to 96 parts by mass (71 parts by mass on average). And said. The concentrations of such materials were mixed at a temperature of about 24 ° C. and then cured.

-Concentration of environmentally regulated substances in recycled products In the test system, Pb eluted from recycled products was 0 mg / L (below the lower limit of detection) to 0.031 mg / L (average 0.009 mg / L), and hexavalent chromium was 0.008 mg / L to 0.079 mg / L (average 0.032 mg / L), fluorine 0.10 mg / L to 0.69 mg / L (average 0.28 mg / L), selenium 0.002 mg / L to 0.010 mg / L (average 0.0046 mg / L)) and boron were 0.21 mg / L to 0.49 mg / L (average 0.41 mg / L).

Twenty-seven examples of this test system are used as teacher data, and the element concentration of ash, the concentration of materials, and the concentration of environmentally regulated substances are used as teacher data. Statistical analysis business package JUSE-StatWorks (registered trademark) / V5 (Japan Co., Ltd.) A prediction formula was created by multivariate analysis by the response surface methodology using the Science and Technology Training Institute). As the prediction formula, a prediction formula for hardness, lead elution, and hexavalent chromium elution was prepared for cement as a solution, and a prediction formula (B1) was used in which those satisfying these at the same time were used for mixing.

-Manufacturing of recycled products using the prediction formula For the four samples of new ash for which the regeneration treatment was examined, the elemental concentration of the ash was measured by the same means as the test system used for the above-mentioned examination of the prediction formula. Using the measured data, a control value was set for the concentration of the environmentally regulated substance, and the material concentration was calculated by the prediction formula (B1). As a result of manufacturing recycled products by mixing the materials based on the calculation results, the concentrations of the environmentally regulated substances were less than or equal to the values set as the control values.

INDUSTRIAL APPLICABILITY The present invention can be used for producing a recycled ash product such as artificial crushed stone, and is industrially useful.

1 Analytical means 10 Ash 11, 21 Communication means 100, 101 Manufacturing system 2 Calculation means 3 Mixing means 30 Mixing tanks 31 to 34 Adjusting means 321, 331, 341 Material tank 4 Storage units 51, 52 units

Claims (6)

It is a method of manufacturing recycled ash with controlled concentration of environmentally regulated substances.
An analysis process that analyzes the elemental concentration of ash used in recycled ash products,
Based on the concentration correlation prediction formula obtained by multivariate analysis using the element concentration of ash, the material concentration of the material used for the recycled product, and the environmentally regulated substance concentration of the recycled ash product obtained by these combinations as teacher data. In addition, a calculation step of calculating the material concentration for keeping the concentration of the environmentally regulated substance of the recycled product of the ash below the control value with respect to the element concentration of the ash analyzed in the analysis step.
It has a mixing step of mixing the material at the material concentration calculated by the calculation step.
A method of manufacturing recycled ash. The elements of ash analyzed in the analysis step are Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Ni, Cu, Zn, As, Se, Br, Ag. The method of claim 1, wherein 5 or more elements selected from the group consisting of, Cd, and Pb are analyzed. The method according to claim 1 or 2, wherein the material is ash, a solidifying material, water, and a drug. The agents are from gypsum, lime, calcium chloride, sodium sulfide, ferric chloride, ferric polysulfate, sodium silicate, sodium aluminate, calcium aluminate, aluminum hydroxide, aluminum dross, and organic chelating agents. The method according to claim 3, wherein the agent is one or more agents selected from the group. The method according to any one of claims 1 to 4, wherein the environmentally regulated substance is selected from the group consisting of fluorine, mercury, cadmium, lead, hexavalent chromium, arsenic, selenium, and boron. A system for manufacturing recycled ash products with controlled concentrations of environmentally regulated substances.
Analytical means for analyzing the elemental concentration of ash used in recycled ash products,
Based on the concentration correlation prediction formula obtained by multivariate analysis using the element concentration of ash, the material concentration of the material used for the recycled product, and the environmentally regulated substance concentration of the recycled ash product obtained by these combinations as teacher data. In addition, a calculation means for calculating the material concentration for keeping the concentration of the environmentally regulated substance of the recycled product of the ash below the control value with respect to the element concentration of the ash analyzed in the analysis step.
It has a mixing means for mixing the material at the material concentration calculated by the calculation step.
A system for manufacturing recycled ash.

Images