JP2019042624A - Coal ash treatment/physical distribution method - Google Patents

Abstract

To receive, at one place, coal ashes generated in heat power stations at respective places, and recover useful minor components, and effectively use coal ashes after recovery of the minor components.SOLUTION: According to this coal ash treatment/physical distribution method, coal ashes generated in heat power stations are received at one place, component analysis is performed for useful minor components of coal ashes, useful minor components are extracted, coal ashes from which the useful components are extracted are classified according to nature thereof and are stored in any one of plural storage facilities, and shipping is performed by a prescribed method as products according to use of coal ash and nature of coal ash stored in each storage facility. Extraction of useful components from coal ashes may be performed by an extraction method according to a result of the component analysis, and further, a concentration of useful minor components in coal ashes and a method for extraction of useful minor components are associated with each other and are recorded in adance in a database, and a method for extraction of useful minor components may be selected from the database according to a result of the component analysis.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for treating and distributing coal ash to effectively utilize coal ash generated at a coal-fired power plant.

  In the past, coal ash produced at a coal-fired thermal power plant was mainly disposed of at a final disposal site and treated. However, since the final disposal site capacity is approaching its limit, and it is becoming difficult to secure a new disposal site, there has been a need for a method of treating coal ash other than landfilling at the final disposal site.

  So, in recent years, in addition to using it as a substitute material of a clay raw material in a cement plant, effectively using coal ash, such as using it for roadbed materials, civil engineering work, coal mine filling, building materials, etc., is performed.

  In addition, in order to supply coal ash to each of these applications, coal ash generated at coal-fired power plants in various locations is received and stored at one location, and classification is appropriately performed, if necessary, according to the properties of the coal ash. After processing such as mixing, delivery to various applications is performed (see Patent Document 1).

JP 2005-313165 A

  By the way, although it is known that coal ash contains rare earths, precious metals, rare metals, etc., at present the treatment of coal ash has not been performed in view of recovery of such useful trace components. is there.

  Therefore, the present invention has been made in view of the problems in the above-mentioned conventional technology, and accepts coal ash generated at coal-fired thermal power plants in various places at one place and recovers useful trace components. An object of the present invention is to provide a coal ash processing / distribution method capable of effectively using the coal ash after the trace component recovery.

  In order to achieve the above object, the present invention is a method for treating and distributing coal ash, which receives coal ash generated at coal-fired power plants in various places at one place, and useful trace components contained in the received coal ash The component analysis is carried out with respect to and, as a result of the component analysis, when the useful trace component is equal to or higher than the predetermined concentration, the coal ash from which the useful trace component is extracted from the coal ash and the useful trace component is extracted The coal ash not extracted is classified according to the property, and it is judged which of the plurality of storage facilities the coal ash classified according to the property is to be distributed to, then stored in any storage facility, the use of coal ash and (A) coal ash is extracted from one storage facility of the plurality of storage facilities and shipped as a product according to the properties of the coal ash stored in the respective storage facilities, or (b) the plurality of the plurality of From storage facilities Shipping out as a product the product obtained by mixing coal ash or coal ash with each other or mixing coal ash with other raw materials, or (c) classifying coal ash extracted from one storage facility of the plurality of storage facilities Product obtained as a product is shipped as a product, or (d) coal ash extracted from one storage facility or a plurality of storage facilities of the plurality of storage facilities is classified, and the classified coal It is characterized in that either the product obtained by mixing the classified coal ash with another raw material is shipped as a product, and any of the selected (a) to (d) is performed. Do.

  ADVANTAGE OF THE INVENTION According to this invention, while receiving the coal ash produced | generated by the coal-fired-fired power plant of each place in one place and recovering a useful trace component, the coal ash after trace component recovery can be used effectively. In addition, by sorting and shipping each of the coal ash from which useful trace components have been extracted according to the properties, it is possible to achieve efficient processing of coal ash and distribution. Furthermore, according to the property of coal ash, after processing such as classification, mixing, etc. appropriately, it can be distributed to various uses, and more coal ash can be treated.

  In the said invention, extraction of the useful trace component from the said coal ash can be performed by the extraction method according to the result of the said component analysis. This enables efficient extraction of useful trace components.

  In the above invention, the concentration of useful minor component of coal ash and the method for extracting the useful minor component are linked in advance and recorded in the database, and the method for extracting the useful minor component from the database according to the result of the component analysis It can be selected. Thereby, extraction of an active trace amount ingredient can be performed still more quickly and efficiently.

  In the above invention, the component analysis of the coal ash can be laser ablation inductively coupled plasma mass spectrometry performed on the surface of the coal ash and inside the coal ash exposed by crushing the coal ash. Thereby, the component of coal ash can be analyzed continuously accurately.

  In the above invention, the extraction of useful trace components from coal ash can be carried out by washing with water, leaching, total dissolution with strong acid, selective adsorption recovery and alkaline melting alone or in combination. Thereby, the useful trace component can be extracted according to the amount and the position of the useful trace component in the coal ash.

  In the above invention, the useful trace component can be one or more selected from rare earths, noble metals, rare metals, lithium, iron, silica, aluminum and carbon. Thus, useful trace components such as rare earths can be recovered in advance, and coal ash after resource recovery can be used effectively.

  As described above, according to the present invention, coal ash generated at coal-fired power plants in various places is received at one place, and useful trace components are recovered, and the coal ash after the recovery of the trace components is effectively used. can do.

It is a flow chart which shows an example of a system which enforces a coal ash processing and physical distribution method concerning the present invention.

  Next, an embodiment of a coal ash processing and distribution method according to the present invention will be described with reference to the drawings.

  FIG. 1 shows an example of a system for carrying out the coal ash processing and distribution method according to the present invention, and this coal ash processing and distribution combined system 1 is a coal-fired thermal power plant (hereinafter abbreviated as “power plant”) 2 (2A to 2D), an air transport machine including a pumping pipe (not shown) as a receiving facility for coal ash generated in (2A to 2D), a component analyzer 3 for analyzing components of useful trace components contained in received coal ash, Raw powder silo 4 (4A to 4C) as a plurality of storage facilities for storing coal ash sorted according to the analysis result after component analysis of the components, and an extraction device 5 for extracting useful trace components from coal ash Intermediate silo 6 (6A to 6C) for sorting and storing each of the coal ash after extraction of useful trace components according to the properties (5A to 5C) and cement for storing cement manufactured in a cement plant Rhino 7, a classifier 8 for classifying coal ash, a mixer 9 for mixing coal ash or coal ash with other raw materials, fly ash silo 10 and product silos 11 (11A to 11C), and a plurality of uses Separately, it comprises shipping equipment such as bulk truck loading equipment (not shown) for shipping coal ash or a mixture of coal ash and other raw materials.

  For transportation of coal ash from power plant 2 to coal ash processing / distribution combined system 1, a cement tanker or cement delivery vehicle etc. is used, and in order to receive coal ash from any of these, receiving facilities including a pressure pipe are Provided. In order to receive coal ash transported by cement tanker, it is preferable to provide a coal ash processing and distribution complex system 1 on the coast and provide a dedicated wharf, thereby reducing the cost of transporting coal ash. Can.

  The component analysis device 3 is an analysis device for measuring the content of useful trace components such as rare earths, precious metals, rare metals, lithium, iron, silica, aluminum, carbon, etc. contained in coal ash generated in the power plant 2 A laser ablation inductively coupled plasma mass spectrometer is used. Component analysis of coal ash by the component analyzer 3 is performed by applying laser ablation inductively coupled plasma mass spectrometry to the surface of the coal ash and the inside of the coal ash exposed by crushing the coal ash.

  The coal ash is sorted according to the result of component analysis by the component analyzer 3 and stored in the raw material silos 4A to 4C. In addition, for coal ash in which the content of useful minor components is lower than a predetermined value, storage in raw powder silo 4 and extraction of useful minor components by extraction device 5 described later are not performed, and intermediate silo 6A according to the property. It is stored in any of ~ 6C.

  Raw powder silo 4 is provided to store the coal ash after component analysis. Coal ash extracted from raw powder silos 4A to 4C is supplied to extraction devices 5A to 5C, respectively, via a transport machine (not shown).

  The extraction devices 5 (5A to 5C) extract useful trace components from the coal ash by the extraction method according to the result of the component analysis by the component analysis device 3, that is, the amount of useful trace components in the coal ash and the location. Extraction of useful trace components by the extraction device 5 is performed by washing with water, leaching to obtain different components stepwise by washing with solutions having different pH, total dissolution with strong acid, selective adsorption recovery for adsorbing the components in the solution to the polymer, and alkali Each treatment such as melting is performed by performing alone or in combination depending on the result of component analysis.

  In addition, the concentration of the useful trace component of coal ash and the extraction method of the useful trace component are linked in advance and recorded in a database, and the coal ash is classified into raw silo 4A to 4C according to the result of component analysis by the component analyzer 3. After sorting automatically, useful trace components may be extracted by the extraction devices 5A to 5C. Thereby, extraction of an active trace amount ingredient can be performed still more quickly and efficiently.

  The coal ash after extraction of useful trace components is characterized by measuring its fineness and chemical components other than useful trace components to classify properties, and according to the classification, it is determined which of multiple intermediate silos 6 to be stored in Distribute the coal ash to the intermediate silo 6 (6A to 6C) for each property.

  An intermediate silo 6 (6A-6C) is provided for storing each of the coal ash classified according to the nature after extraction of the useful trace constituents. The intermediate silo 6A is directly provided with a shipping facility (not shown), and the coal ash extracted from the intermediate silos 6B and 6C is supplied to the classifier 8 or the mixer 9 via a transporter (not shown). It is configured.

  The cement silo 7 is provided to store cement manufactured in a cement plant located outside the coal ash processing and distribution complex system 1. In addition, it can also be comprised so that the cement manufactured by the cement factory attached to the coal ash processing and physical distribution composite system 1 may be stored.

  The classifier 8 includes O-SEPA (registered trademark), CLASSIEL (registered trademark), cyclone separator, and other centrifugal classifiers, gravity classifiers, and inertias that are generally used for classification of powders such as cement and fly ash. A classifier, a sieving machine, etc. can be used. The classifier 8 classifies coal ash from the intermediate silo 6B or 6C to a desired particle size.

  The mixer 9 includes Ploughshare® mixers, Henschel mixers®, and other container rotary mixers, mechanical stirring mixers, and airflows usually used for mixing powders such as cement and fly ash. A mixer, a vibration mixer, etc. can be used. Coal ash is supplied directly from this intermediate silo 6B or 6C to this mixer 9, or coal ash whose particle size is adjusted by the classifier 8 is supplied, and other raw materials such as cement from the cement silo 7 Be mixed.

  The fly ash silo 10 stores JIS fly ash (fly ash specified in JIS A 6201) obtained by the classifier 8, and the product silo 11 stores the mixed material for CA concrete, the mixed material for FA mortar, etc. Each of these silos is provided with a shipping facility (not shown).

  Next, an example of use of the coal ash processing / distribution combined system 1 having the above-described configuration as a base of processing and distribution of coal ash will be described.

  Coal ash generated at the power plant 2 is transported by a cement tanker or a cement delivery vehicle or the like, and is sent to the coal ash processing / distribution combined system 1 via a receiving facility including a delivery pipe and the like. Here, when the coal ash processing / distribution complex system 1 is provided on the coast and equipped with a dedicated wharf, coal ash can be received directly from the power plant 2 located in the waterfront via the cement tanker, and inland From the power plant 2, coal ash is received by land transportation by cement transportation.

  Next, the content of useful trace components such as rare earths, noble metals, rare metals, lithium, iron, silica, aluminum, carbon and the like is measured using the component analyzer 3 for the received coal ash. The measurement of the content of useful trace components is performed on the surface of the coal ash and the inside of the coal ash exposed by crushing the coal ash.

  Next, according to the result of component analysis, the coal ash is sorted and distributed to raw powder silo 4 (4A to 4C). In addition, when the content rate of the useful trace component of coal ash is less than a predetermined value, storage by the raw powder silo 4 is not performed, and depending on the property, it is sent to any of the intermediate silo 6 (6A to 6C).

  Next, with respect to the coal ash stored in the raw powder silos 4A to 4C, extraction of useful trace components is performed by the extraction devices 5A to 5C by the extraction method according to the result of the component analysis. The selection of the extraction method according to the result of the component analysis may be performed by automatically reading out and executing the extraction method stored in advance in the database in association with the result of the component analysis. You may choose the method.

  Next, with regard to coal ash after extraction of useful trace components, residuals of coal ash or coal ash for which extraction of useful trace components has not been performed, characteristics are classified by measuring chemical components other than useful trace components and fineness, and classification thereof According to the above, it is determined which of the plurality of intermediate silos 6 is to be stored, and the coal ash is distributed to the intermediate silos 6 (6A to 6C) for each property.

  Among the coal ash stored in the intermediate silo 6, the coal ash stored in the intermediate silo 6A is directly transported to the inland cement plant group via the shipping facility and cement transportation vehicle, and the clay raw material in cement production Used as a substitute for Thus, the intermediate silo 6A stores coal ash which does not need to be classified.

  A part of the coal ash stored in the intermediate silo 6B or 6C is classified by the classifier 8, and the powder obtained by classification conforms to the fly ash standard defined in JIS A 6201, Store in fly ash silo 10 In addition, a part of the coal ash whose particle size is adjusted by the classifier 8 is supplied to the mixer 9 for producing a mixed material for CA concrete, a mixed material for FA mortar, and the like.

  When producing the CA concrete mixed material, the coal ash and slag powder supplied from the classifier 8 are mixed in the mixer 9 and the CA concrete mixed material obtained by mixing is stored in the product silo 11 .

  When manufacturing the mixed material for FA mortar, the coal ash and limestone powder supplied from the classifier 8 are mixed in the mixer 9, and the mixed material for FA mortar obtained by mixing is stored in the product silo 11 Be done.

  JIS fly ash stored in the fly ash silo 10 is shipped as it is to the cement plant 20 by cement transportation, mixed with cement by the mixer 21, and stored in the fly ash cement silo 22 in the cement plant 20, Shipment by cement transportation.

  In the above embodiment, the cement plant 20 is disposed outside the coal ash processing / distribution composite system 1, but by including the cement production facility in the coal ash processing / distribution complex system 1, the coal ash processing / distribution After JIS fly ash cement is manufactured by the mixer 9 in the combined system 1 and stored in the product silo 11 in the coal ash processing and distribution combined system 1, it can be shipped by cement transportation.

Reference Signs List 1 coal ash processing / distribution complex system 2 power plant 3 component analysis device 4 raw powder silo 5 extraction device 6 intermediate product silo 7 cement silo 8 classification machine 9 mixer 10 fly ash silo 11 product silo 20 cement plant 21 mixer 22 fly Ash cement silo

Claims (6)

Accept coal ash generated at coal-fired thermal power plants at various locations at one location,
Perform component analysis on useful trace components contained in the received coal ash,
As a result of the component analysis, when the useful trace component is at a predetermined concentration or more, the useful trace component is extracted from the coal ash,
Classification according to the characteristics of coal ash from which the useful minor component has been extracted or coal ash from which the useful minor component has not been extracted;
It is stored in one of the storage facilities after determining which of multiple storage facilities the coal ash classified according to the property is to be distributed to,
(A) coal ash is extracted from one storage facility of the plurality of storage facilities and shipped as it is as a product according to the use of the coal ash and the properties of the coal ash stored in the respective storage facilities or b) shipping as a product a product obtained by mixing coal ash extracted from the plurality of storage facilities or coal ash and another raw material, or (c) storing one of the plurality of storage facilities The product obtained by classifying coal ash extracted from equipment is shipped as a product, or (d) coal ash extracted from one storage facility or multiple storage facilities of the plurality of storage facilities is classified, Further, either the classified coal ash or a product obtained by mixing the classified coal ash and another raw material is shipped as a product, and the selected (a) to (d) are selected. Coal ash processing and distribution method characterized by performing either.   The coal ash processing / distribution method according to claim 1, wherein the extraction of useful trace components from the coal ash is performed by an extraction method according to the result of the component analysis.   The concentration of the useful trace component of the coal ash and the method of extracting the useful trace component are linked in advance and recorded in a database, and the method of extracting the useful trace component is selected from the database according to the result of the component analysis. The coal ash processing and distribution method according to claim 2, characterized in that   The component analysis of the coal ash is characterized in that it is laser ablation inductively coupled plasma mass spectrometry performed on the surface of the coal ash and inside the coal ash exposed by crushing the coal ash. Coal ash processing and distribution method described in.   The extraction of useful trace components from the coal ash is carried out by washing with water, leaching, total dissolution with a strong acid, selective adsorption recovery and alkaline melting alone or in combination. Coal ash processing and distribution method described in.   The coal ash treatment / distribution according to any one of claims 1 to 5, wherein the useful trace component is one or more selected from rare earths, noble metals, rare metals, lithium, iron, silica, aluminum and carbon. Method.

Images