JP6905337B2 - Main ash desalination / cement raw material method and equipment - Google Patents

Main ash desalination / cement raw material method and equipment Download PDF

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JP6905337B2
JP6905337B2 JP2016549994A JP2016549994A JP6905337B2 JP 6905337 B2 JP6905337 B2 JP 6905337B2 JP 2016549994 A JP2016549994 A JP 2016549994A JP 2016549994 A JP2016549994 A JP 2016549994A JP 6905337 B2 JP6905337 B2 JP 6905337B2
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慶展 辰巳
慶展 辰巳
瞬 新島
瞬 新島
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
    • B03B1/04—Conditioning for facilitating separation by altering physical properties of the matter to be treated by additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/10—Burned or pyrolised refuse
    • C04B18/105—Gaseous combustion products or dusts collected from waste incineration, e.g. sludge resulting from the purification of gaseous combustion products of waste incineration
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J1/00—Removing ash, clinker, or slag from combustion chambers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Civil Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Processing Of Solid Wastes (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Description

本発明は、都市ごみ等を焼却した際に発生するごみ焼却灰（主灰）から塩素分を除去する方法及び装置、並びに主灰から塩素分を除去した後セメント原料として利用する方法及び装置に関する。 The present invention relates to a method and an apparatus for removing chlorine from waste incineration ash (main ash) generated when municipal waste is incinerated, and a method and apparatus for using as a cement raw material after removing chlorine from the main ash. ..

都市ごみ等を焼却した際に発生する主灰は、従来、そのほとんどが最終処分場で埋め立て処理されていたが、最終処分場の枯渇の虞に鑑み、近年、セメント原料として利用されている。主灰は塩素分を多く含むため、セメント原料として利用するにあたって事前に塩素分を除去する必要がある。主灰は粒子の粒度によって塩素濃度が異なり、微粒子側に塩素分が偏在している。 Most of the main ash generated when incinerating municipal waste has been landfilled at the final disposal site in the past, but in recent years it has been used as a raw material for cement in view of the risk of depletion of the final disposal site. Since the main ash contains a large amount of chlorine, it is necessary to remove the chlorine content before using it as a raw material for cement. The chlorine concentration of the main ash differs depending on the particle size of the particles, and the chlorine content is unevenly distributed on the fine particles side.

そこで、特許文献１等には、図２に示すように、ホッパ２に受け入れた主灰Ｍと、主灰Ｍの１倍〜１０倍の重量の水Ｗ４とを混合撹拌装置１２で混合撹拌した後、主灰スラリーＳ１を分級装置１３で微粒子スラリーＳ２と粗粒子Ｃとに分級し、微粒子スラリーＳ２をタンク１４に供給して水洗し、酸性ガス導入装置１５から酸性ガスＧをタンク１４に導入して微粒子スラリーＳ２に含まれる難溶性塩の分解を促進し、タンク１４から排出したスラリーＳ３を固液分離装置１６でろ液Ｌと微粒子Ｆとに固液分離し、ろ液Ｌを排水処理装置１７で水処理すると共に、微粒子Ｆを粗粒子Ｃと合流させてセメント原料として利用する装置１１が記載されている。 Therefore, in Patent Document 1 and the like, as shown in FIG. 2, the main ash M received in the hopper 2 and the water W4 having a weight 1 to 10 times that of the main ash M are mixed and stirred by the mixing and stirring device 12. After that, the main ash slurry S1 is classified into fine particle slurry S2 and coarse particles C by the classification device 13, the fine particle slurry S2 is supplied to the tank 14 and washed with water, and the acidic gas G is introduced into the tank 14 from the acidic gas introduction device 15. Then, the decomposition of the sparingly soluble salt contained in the fine particle slurry S2 is promoted, the slurry S3 discharged from the tank 14 is solid-liquid separated into the filtrate L and the fine particles F by the solid-liquid separation device 16, and the filtrate L is separated into the wastewater treatment apparatus. Described is an apparatus 11 in which fine particles F are combined with coarse particles C and used as a raw material for cement while being treated with water in No. 17.

日本国特許第５５６１３２６号公報Japanese Patent No. 556132

しかし、上記特許文献１等に記載の主灰の脱塩・セメント原料化装置１１では、主灰Ｍのスラリー化及び水洗に大量の水Ｗ４を用いるため、運転コストが高くなると共に、分級装置１３、タンク１４、固液分離装置１６や排水処理設備１７等が大規模なものとなり設備コストが高くなるという問題があった。 However, in the main ash desalting / cement raw material apparatus 11 described in Patent Document 1 and the like, since a large amount of water W4 is used for slurrying and washing the main ash M, the operating cost is high and the classification apparatus 13 is used. , The tank 14, the solid-liquid separation device 16, the wastewater treatment facility 17, and the like are large-scale, and there is a problem that the equipment cost is high.

そこで、本発明は、上記従来技術における問題点に鑑みてなされたものであって、運転コスト及び設備コストを低く抑えながら主灰を脱塩し、セメント原料等に利用することを目的とする。 Therefore, the present invention has been made in view of the above-mentioned problems in the prior art, and an object of the present invention is to desalt the main ash and use it as a raw material for cement or the like while keeping the operating cost and the equipment cost low.

上記目的を達成するため、本発明は、主灰の脱塩方法であって、主灰に、該主灰の０．１倍以上１倍未満の重量の水を添加して解泥し、該解泥後の主灰スラリーを分級し、該分級によって得られた微粒子スラリーを水洗することを特徴とする。尚、解泥とは、液体と混合状態にある固体の粒子凝集体を分散させることをいう。 In order to achieve the above object, the present invention is a method for desalting main ash, in which water having a weight of 0.1 times or more and less than 1 times the weight of the main ash is added to the main ash to demud the main ash. The main ash slurry after demudification is classified, and the fine particle slurry obtained by the classification is washed with water. In addition, demud refers to dispersing solid particle agglomerates in a state of being mixed with a liquid.

本発明によれば、少量の水で解泥を行うことで主灰の粒子同士が磨砕し合い、短時間で固体の粒子凝集体を分散させることができ、その後の分級、水洗、固液分離を少量の水で行うことができ、水処理の対象となる排水の量も大幅に低下するため、運転コスト及び設備コストを著しく低減することができる。また、粒子同士の磨砕により粗粒子の表面の塩素濃度の高い部分を削り落とし、脱塩効率を向上させることができる。 According to the present invention, by demudging with a small amount of water, the particles of the main ash are ground to each other, and solid particle agglomerates can be dispersed in a short time, followed by classification, washing with water, and solid liquid. Since the separation can be performed with a small amount of water and the amount of wastewater to be treated with water is significantly reduced, the operating cost and the equipment cost can be significantly reduced. In addition, by grinding the particles together, the portion of the surface of the coarse particles having a high chlorine concentration can be scraped off, and the desalting efficiency can be improved.

上記主灰の脱塩方法において、前記分級時に、前記主灰スラリーに散水することができ、これによって分級効率を向上させると共に、合わせて水洗も行うことができる。 In the method for desalting the main ash, water can be sprinkled on the main ash slurry at the time of the classification, thereby improving the classification efficiency and also washing with water.

さらに、前記分級における分級点を０．５ｍｍを超え１ｍｍ以下とすることができる。主灰が十分に解泥され、粒子凝集体が分散していること、及び粒子同士の磨砕により粗粒子の表面の塩素濃度の高い部分が削り落とされているため、分級点の上限値を小さく設定し、効率よく主灰の脱塩を行うことができる。 Further, the classification point in the classification can be more than 0.5 mm and 1 mm or less. Since the main ash is sufficiently demudified, the particle agglomerates are dispersed, and the high chlorine concentration part on the surface of the coarse particles is scraped off by grinding the particles, the upper limit of the classification point is set. It can be set small and the main ash can be efficiently desalted.

前記水洗時に、前記微粒子スラリーに酸性ガス又は酸を添加することができ、微粒子スラリーに含まれるフリーデル氏塩等の難溶性塩の分解を促進することで、主灰の脱塩率をさらに向上させることができる。 At the time of washing with water, an acid gas or an acid can be added to the fine particle slurry, and the demineralization rate of the main ash is further improved by promoting the decomposition of the sparingly soluble salt such as Friedel's salt contained in the fine particle slurry. Can be made to.

また、本発明は、主灰の脱塩・セメント原料化方法であって、前記分級によって得られた粗粒子をセメント原料として利用することを特徴とする。本発明によれば、上述のように低コストで脱塩した主灰のうち粗粒子をそのままセメント原料として利用することができる。 Further, the present invention is a method for desalting main ash and using it as a raw material for cement, characterized in that the coarse particles obtained by the classification are used as a raw material for cement. According to the present invention, coarse particles of the main ash desalted at low cost as described above can be used as they are as a cement raw material.

前記分級によって得られた粗粒子に空気を吹き付けた後セメント原料として利用することができ、粗粒子に付着した水分量を低減することで、セメント焼成装置における熱損失を低減することができる。 After blowing air on the coarse particles obtained by the classification, it can be used as a raw material for cement, and by reducing the amount of water adhering to the coarse particles, heat loss in the cement firing apparatus can be reduced.

前記分級によって得られた微粒子スラリーを水洗した後固液分離して得られた微粒子、又は前記微粒子スラリーを水洗しながら固液分離して得られた微粒子をセメント原料として利用することができる。本発明によれば、上述のように低コストで脱塩した主灰のうち微粒子をセメント原料として利用することができる。 The fine particles obtained by solid-liquid separation after washing the fine particle slurry obtained by the classification with water, or the fine particles obtained by solid-liquid separation while washing the fine particle slurry with water can be used as a cement raw material. According to the present invention, fine particles of the main ash desalted at low cost as described above can be used as a cement raw material.

さらに、本発明は、主灰の脱塩装置であって、主灰に、該主灰の０．１倍以上１倍未満の重量の水を添加して解泥する解泥装置と、該解泥後の主灰スラリーを分級する分級装置と、該分級によって得られた微粒子スラリーを水洗する水洗装置とを備えることを特徴とする。本発明によれば、少量の水で解泥を行うことで運転コスト及び設備コストを大幅に低減し、脱塩効率を向上させることができる。 Further, the present invention is a desalination apparatus for main ash, which comprises adding water having a weight of 0.1 times or more and less than 1 times that of the main ash to the main ash to demud the main ash. It is characterized by comprising a classification device for classifying the main ash slurry after mud and a water washing device for washing the fine particle slurry obtained by the classification with water. According to the present invention, it is possible to significantly reduce the operating cost and the equipment cost and improve the desalination efficiency by dehumidifying with a small amount of water.

また、本発明は、主灰の脱塩・セメント原料化装置であって、前記分級装置による分級によって得られた粗粒子をセメント製造装置に供給する供給装置をさらに備えることを特徴とする。本発明によれば、低コストで脱塩した主灰のうち粗粒子をそのままセメント原料として利用することができる。 The present invention is further provided with a main ash desalting / cement raw material apparatus, further comprising a supply apparatus for supplying coarse particles obtained by classification by the classification apparatus to a cement production apparatus. According to the present invention, coarse particles of the main ash desalted at low cost can be used as they are as a raw material for cement.

前記分級装置による分級によって得られた微粒子スラリーを水洗した後固液分離して得られた微粒子、又は前記微粒子スラリーを水洗しながら固液分離して得られた微粒子をセメント製造装置に供給する供給装置をさらに備えることができる。本発明によれば、低コストで脱塩した主灰のうち微粒子をセメント原料として利用することができる。 Supply to the cement manufacturing apparatus the fine particles obtained by solid-liquid separation after washing the fine particle slurry obtained by the classification by the classification device with water, or the fine particles obtained by solid-liquid separation while washing the fine particle slurry with water. Further equipment can be provided. According to the present invention, fine particles of the main ash desalted at low cost can be used as a cement raw material.

以上のように、本発明によれば、運転コスト及び設備コストを低く抑えながら主灰を脱塩し、セメント原料等に利用することができる。 As described above, according to the present invention, the main ash can be desalted and used as a raw material for cement while keeping the operating cost and the equipment cost low.

本発明に係る主灰の脱塩・セメント原料化装置の一実施の形態を示す全体構成図である。It is an overall block diagram which shows one Embodiment of the main ash desalting / cement raw material conversion apparatus which concerns on this invention. 従来の主灰の脱塩・セメント原料化装置の一例を示す全体構成図である。It is an overall block diagram which shows an example of the conventional main ash desalting / cement raw material use apparatus.

次に、本発明を実施するための形態について、図面を参照しながら詳細に説明する。 Next, a mode for carrying out the present invention will be described in detail with reference to the drawings.

図１は、本発明に係る主灰の脱塩・セメント原料化装置の一実施の形態を示し、この装置１は、ごみ焼却灰（以下「主灰」という。）Ｍを受け入れるホッパ２と、ホッパ２から供給された主灰Ｍを解泥するドラムウォッシャ３と、ドラムウォッシャ３から排出された主灰スラリーＳ１を分級する分級装置４と、分級装置４内の粗粒子Ｃに空気Ａを吹き付ける空気吹き付け装置５と、分級装置４から排出された微粒子スラリーＳ２の微粒子を水洗するタンク６と、タンク６に酸性ガスＧを導入する酸性ガス導入装置７と、タンク６から排出されたスラリーＳ３を固液分離するフィルタプレス等の固液分離装置８と、固液分離装置８から排出されたろ液Ｌを水処理する排水処理装置９等とを備える。 FIG. 1 shows an embodiment of an apparatus for desalting and cement raw material of main ash according to the present invention, in which the apparatus 1 includes a hopper 2 for receiving waste incineration ash (hereinafter referred to as “main ash”) M. Air A is blown onto the drum washer 3 that dehumidifies the main ash M supplied from the hopper 2, the classifying device 4 that classifies the main ash slurry S1 discharged from the drum washer 3, and the coarse particles C in the classifying device 4. The air blowing device 5, the tank 6 for washing the fine particles of the fine particle slurry S2 discharged from the classification device 4, the acidic gas introducing device 7 for introducing the acidic gas G into the tank 6, and the slurry S3 discharged from the tank 6 A solid-liquid separation device 8 such as a filter press for solid-liquid separation, and a wastewater treatment device 9 for water-treating the filtrate L discharged from the solid-liquid separation device 8 are provided.

解泥装置としてのドラムウォッシャ３は、例えば、株式会社気工社製のＫＤＷ型等を用いることができる。このドラムウォッシャ３は、内部に多数のリフタが立設された回転式のドラムを備える解泥装置であって、少量の水で主灰Ｍの粒子同士の磨砕を効率的に生じさせ、短時間で固体の粒子凝集体を分散させることができる。 As the drum washer 3 as the mud removing device, for example, a KDW type manufactured by Kiko Co., Ltd. or the like can be used. The drum washer 3 is a mud-decomposing device provided with a rotary drum having a large number of lifters erected inside, and efficiently grinds particles of main ash M with a small amount of water, and is short. Solid particle agglomerates can be dispersed over time.

分級装置４には水篩（振動篩）等を用いることができ、分級の対象となる主灰スラリーＳ１に散水する散水装置を備える。 A water sieve (vibration sieve) or the like can be used for the classification device 4, and a watering device for sprinkling water on the main ash slurry S1 to be classified is provided.

空気吹き付け装置５は、分級装置４において主灰スラリーＳ１が分級される際に、分級装置４内の粗粒子Ｃに空気Ａを吹き付けて粗粒子Ｃに付着している水分を除去するために備えられる。尚、分級装置４から排出された粗粒子Ｃに空気Ａを吹き付けてもよい。 The air blowing device 5 is provided for blowing air A onto the coarse particles C in the classifying device 4 to remove the moisture adhering to the coarse particles C when the main ash slurry S1 is classified in the classifying device 4. Be done. Air A may be blown onto the coarse particles C discharged from the classifying device 4.

酸性ガス導入装置７は、タンク６に酸性ガスＧを導入するために設けられ、導入する酸性ガスＧとしては、ＣＯ2を多く含むセメントキルンの排ガスやＳＯ2を多く含む塩素バイパス設備の排ガスを利用することができる。酸性ガスＧに代えて、硫酸、硝酸、酢酸、ギ酸等の酸をタンク６内の微粒子スラリーＳ２に添加してもよい。The acid gas introduction device 7 is provided to introduce the acid gas G into the tank 6, and the acid gas G to be introduced includes the exhaust gas of a cement kiln containing a large amount of CO 2 and the exhaust gas of a chlorine bypass facility containing a large amount of SO 2. It can be used. Instead of the acid gas G, an acid such as sulfuric acid, nitric acid, acetic acid, or formic acid may be added to the fine particle slurry S2 in the tank 6.

次に、上記構成を有する装置１の動作について図１を参照しながら説明する。 Next, the operation of the device 1 having the above configuration will be described with reference to FIG.

ホッパ２に受け入れた主灰Ｍをドラムウォッシャ３の回転するドラム内に投入すると共に、この主灰Ｍの０．５倍程度の重量の水Ｗ１をドラム内の主灰Ｍに添加し、主灰Ｍの粒子同士を磨砕させながら固体の粒子凝集体を分散させる。ドラムウォッシャ３に供給する水Ｗ１の重量を、主灰Ｍの重量の０．１倍〜１倍の範囲で調整することができる。 The main ash M received in the hopper 2 is put into the rotating drum of the drum washer 3, and water W1 having a weight about 0.5 times that of the main ash M is added to the main ash M in the drum to add the main ash M. Solid particle agglomerates are dispersed while grinding the M particles. The weight of the water W1 supplied to the drum washer 3 can be adjusted in the range of 0.1 to 1 times the weight of the main ash M.

次に、ドラムウォッシャ３から排出された主灰スラリーＳ１を分級装置４に供給して分級する。この際、主灰Ｍの０．８倍程度の重量の水Ｗ２を分級装置４に散水し、分級によって得られた粒径が０．７ｍｍ程度以上の粗粒子Ｃに、空気吹き付け装置５から空気Ａを吹き付け、粗粒子Ｃに付着している水分を除去する。分級装置４に散水する水Ｗ２の重量を、主灰Ｍの重量の０．１倍〜２倍の範囲で調整することで、分級効率を向上させると共に、微粒子スラリーＳ２の水分含有量を調整することができる。分級装置４の分級点を０．５を超え１ｍｍ以下の範囲で調整する。 Next, the main ash slurry S1 discharged from the drum washer 3 is supplied to the classification device 4 for classification. At this time, water W2 having a weight of about 0.8 times that of the main ash M is sprinkled on the classification device 4, and air is blown from the air blowing device 5 onto the coarse particles C having a particle size of about 0.7 mm or more obtained by the classification. A is sprayed to remove the water adhering to the coarse particles C. By adjusting the weight of the water W2 sprinkled on the classification device 4 in the range of 0.1 to 2 times the weight of the main ash M, the classification efficiency is improved and the water content of the fine particle slurry S2 is adjusted. be able to. The classification point of the classification device 4 is adjusted within a range of more than 0.5 and 1 mm or less.

分級装置４から微粒子を含む微粒子スラリーＳ２をタンク６に供給して微粒子を水洗する。さらに、酸性ガス導入装置７から酸性ガスＧをタンク６に添加し、微粒子スラリーＳ２に含まれるフリーデル氏塩等の難溶性塩の分解を促進させる。この際、タンク６内の微粒子スラリーＳ２のｐＨを２〜１２、より好ましくは４〜９、さらに好ましくは６〜８に調整する。 The fine particle slurry S2 containing fine particles is supplied from the classification device 4 to the tank 6 to wash the fine particles with water. Further, the acid gas G is added to the tank 6 from the acid gas introduction device 7 to promote the decomposition of the sparingly soluble salt such as Friedel's salt contained in the fine particle slurry S2. At this time, the pH of the fine particle slurry S2 in the tank 6 is adjusted to 2 to 12, more preferably 4 to 9, and even more preferably 6 to 8.

タンク６からスラリーＳ３を固液分離装置８に供給し、洗浄水として水Ｗ３を固液分離装置８に供給し、スラリーＳ３を水洗しながら固液分離し、微粒子Ｆとろ液Ｌとに分離する。ろ液Ｌは排水処理装置９で水処理した後放流し、微粒子Ｆは、分級装置４から排出した粗粒子Ｃと合流させて供給装置（不図示）を介してセメント製造装置に供給し、セメント原料として利用する。 The slurry S3 is supplied from the tank 6 to the solid-liquid separation device 8, water W3 is supplied to the solid-liquid separation device 8 as washing water, the slurry S3 is solid-liquid separated while being washed with water, and separated into fine particles F and a filtrate L. .. The filtrate L is treated with water by the wastewater treatment device 9 and then discharged, and the fine particles F are merged with the coarse particles C discharged from the classification device 4 and supplied to the cement production device via a supply device (not shown), and the cement is cemented. Used as a raw material.

以上説明したように、本実施の形態では、ドラムウォッシャ３等を用いて少量の水で主灰Ｍを解泥することで主灰Ｍの粒子同士が磨砕し合い、短時間で固体の粒子凝集体を分散させることができる。そのため、解泥後の主灰スラリーＳ１の分級を行う分級装置４、タンク６、固液分離装置８等における各工程を少量の水で行うことができ、分級装置４、タンク６、固液分離装置８を大規模なものとする必要がない。また、排水処理装置９において水処理の対象となる排水の量も大幅に低減させることができ、装置１全体において運転コスト及び設備コストを著しく低減することができる。また、ドラムウォッシャ３では、粒子同士の磨砕により主灰Ｍの粗粒子の表面の塩素濃度の高い部分を削り落として水洗することで脱塩効率を向上させることができる。 As described above, in the present embodiment, the particles of the main ash M are ground by demudging the main ash M with a small amount of water using a drum washer 3 or the like, and the particles of the main ash M are solid particles in a short time. Aggregates can be dispersed. Therefore, each step in the classification device 4, the tank 6, the solid-liquid separation device 8 and the like for classifying the main ash slurry S1 after demudification can be performed with a small amount of water, and the classification device 4, the tank 6, and the solid-liquid separation device 4 can be separated. The device 8 does not need to be large. Further, the amount of wastewater to be treated by the wastewater treatment apparatus 9 can be significantly reduced, and the operating cost and the equipment cost of the entire apparatus 1 can be significantly reduced. Further, in the drum washer 3, the desalting efficiency can be improved by scraping off the portion of the surface of the coarse particles of the main ash M having a high chlorine concentration and washing with water by grinding the particles.

尚、本実施の形態では、解泥装置としてドラムウォッシャ３を用いたが、少量の水で主灰Ｍを解泥することのできる他の形式の装置を用いることもできる。 In the present embodiment, the drum washer 3 is used as the mud removing device, but another type of device capable of removing the main ash M with a small amount of water can also be used.

また、タンク６から排出されたスラリーＳ３をフィルタプレス等の固液分離装置８で水洗しながら固液分離したが、脱水機等を用いてスラリーＳ３を単に固液分離することもできる。 Further, the slurry S3 discharged from the tank 6 is separated into solid and liquid while being washed with water by a solid and liquid separating device 8 such as a filter press, but the slurry S3 can be simply separated into solid and liquid by using a dehydrator or the like.

また、ろ液Ｌの一部はドラムウォッシャ３又は／及び分級装置４又は／及び固液分離装置８に戻して再使用することもできる。この際、循環量するろ液の電気伝導度を測定してろ液の循環量を決定することが望ましい。 Further, a part of the filtrate L can be returned to the drum washer 3 and / and the classification device 4 and / and the solid-liquid separation device 8 for reuse. At this time, it is desirable to determine the circulating amount of the filtrate by measuring the electrical conductivity of the filtrate to be circulated.

さらに、脱塩した粗粒子Ｃ及び微粒子Ｆの用途はセメント原料に限らず、路盤材原料等に利用することもできる。 Further, the desalted coarse particles C and fine particles F are not limited to cement raw materials, but can also be used as roadbed material raw materials and the like.

１ 主灰の脱塩・セメント原料化装置
２ ホッパ
３ ドラムウォッシャ
４ 分級装置
５ 空気吹き付け装置
６ タンク
７ 酸性ガス導入装置
８ 固液分離装置
９ 排水処理装置
Ａ 空気
Ｃ 粗粒子
Ｆ 微粒子
Ｇ 酸性ガス
Ｌ ろ液
Ｍ 主灰
Ｓ１ 主灰スラリー
Ｓ２ 微粒子スラリー
Ｓ３ スラリー
Ｗ１〜Ｗ３ 水1 Main ash desalination / cement raw material 2 Hopper 3 Drum washer 4 Classification device 5 Air blowing device 6 Tank 7 Acid gas introduction device 8 Solid-liquid separation device 9 Wastewater treatment device A Air C Coarse particles F Fine particles G Acid gas L Filtrate M Main ash S1 Main ash slurry S2 Fine particle slurry S3 Slurry W1 to W3 Water

Claims (10)

主灰に、該主灰の０．１倍以上１倍未満の重量の水を添加して解泥し、
該解泥後の主灰スラリーを分級し、
該分級によって得られた微粒子スラリーを水洗することを特徴とする主灰の脱塩方法。To the main ash, water having a weight of 0.1 times or more and less than 1 times the weight of the main ash was added to remove the mud.
The main ash slurry after the demudification is classified and
A method for desalting main ash, which comprises washing the fine particle slurry obtained by the classification with water. 前記分級時に、前記主灰スラリーに散水することを特徴とする請求項１に記載の主灰の脱塩方法。 The method for desalting the main ash according to claim 1, wherein water is sprinkled on the main ash slurry at the time of the classification. 前記分級における分級点を０．５ｍｍを超え１ｍｍ以下とすることを特徴とする請求項１又は２に記載の主灰の脱塩方法。 The method for desalting main ash according to claim 1 or 2, wherein the classification point in the classification is more than 0.5 mm and 1 mm or less. 前記水洗時に、前記微粒子スラリーに酸性ガス又は酸を添加することを特徴とする請求項１、２又は３に記載の主灰の脱塩方法。 The method for desalting main ash according to claim 1, 2 or 3, wherein an acid gas or an acid is added to the fine particle slurry at the time of washing with water. 請求項１乃至４のいずれかに記載の主灰の脱塩方法における前記分級によって得られた粗粒子をセメント原料として利用することを特徴とする主灰の脱塩・セメント原料化方法。 A method for desalting and converting a main ash into a cement raw material, which comprises using the coarse particles obtained by the classification in the method for desalting the main ash according to any one of claims 1 to 4 as a cement raw material. 前記分級によって得られた粗粒子に空気を吹き付けた後セメント原料として利用することを特徴とする請求項５に記載の主灰の脱塩・セメント原料化方法。
The method for desalting and converting main ash into a cement raw material according to claim 5, wherein the coarse particles obtained by the classification are blown with air and then used as a cement raw material.
 請求項１乃至４のいずれかに記載の主灰の脱塩方法における前記分級によって得られた微粒子スラリーを水洗した後固液分離して得られた微粒子、又は前記微粒子スラリーを水洗しながら固液分離して得られた微粒子をセメント原料として利用することを特徴とする主灰の脱塩・セメント原料化方法。 The fine particle slurry obtained by the classification according to the method for desalting the main ash according to any one of claims 1 to 4 is washed with water and then solid-liquid separated, or the fine particle slurry is washed with water and solid-liquid. A method for desalting main ash and converting it into a cement raw material, which comprises using the fine particles obtained by separation as a cement raw material. 主灰に、該主灰の０．１倍以上１倍未満の重量の水を添加して解泥する解泥装置と、
該解泥後の主灰スラリーを分級する分級装置と、
該分級によって得られた微粒子スラリーを水洗する水洗装置とを備えることを特徴とする主灰の脱塩装置。A dehumidifying device that demud by adding water having a weight of 0.1 times or more and less than 1 times that of the main ash to the main ash.
A classifying device for classifying the main ash slurry after demudging, and
A main ash desalting apparatus comprising a water washing apparatus for washing the fine particle slurry obtained by the classification. 請求項８に記載の主灰の脱塩装置における前記分級装置による分級によって得られた粗粒子をセメント製造装置に供給する供給装置をさらに備えることを特徴とする主灰の脱塩・セメント原料化装置。 The main ash desalting / cement raw material is further provided with a supply device for supplying the coarse particles obtained by the classification by the classification device in the main ash desalting device according to claim 8 to the cement manufacturing device. Device. 請求項８に記載の主灰の脱塩装置における前記分級装置による分級によって得られた微粒子スラリーを水洗した後固液分離して得られた微粒子、又は前記微粒子スラリーを水洗しながら固液分離して得られた微粒子をセメント製造装置に供給する供給装置をさらに備えることを特徴とする主灰の脱塩・セメント原料化装置。

The fine particle slurry obtained by the classification by the classification device in the main ash desalting apparatus according to claim 8 is washed with water and then solid-liquid separated, or the fine particle slurry is solid-liquid separated while being washed with water. A main ash desalination / cement raw material apparatus, which further comprises a supply apparatus for supplying the obtained fine particles to a cement production apparatus.
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