JP4532411B2 - Incineration fly ash treatment method and apparatus - Google Patents

Incineration fly ash treatment method and apparatus Download PDF

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JP4532411B2
JP4532411B2 JP2005508911A JP2005508911A JP4532411B2 JP 4532411 B2 JP4532411 B2 JP 4532411B2 JP 2005508911 A JP2005508911 A JP 2005508911A JP 2005508911 A JP2005508911 A JP 2005508911A JP 4532411 B2 JP4532411 B2 JP 4532411B2
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fly ash
cake
incineration
kneader
ash cake
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JPWO2005025768A1 (en
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紳一郎 齋藤
朋道 中村
敏章 廣瀬
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Taiheiyo Cement Corp
Taiheiyo Engineering Corp
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Taiheiyo Engineering Corp
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    • 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
    • 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
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B03B9/04—General arrangement of separating plant, e.g. flow sheets specially adapted for furnace residues, smeltings, or foundry slags
    • 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
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
    • C22B3/22—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/006—Wet processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/02—Working-up flue dust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Geology (AREA)
  • Manufacturing & Machinery (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Metallurgy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Engineering & Computer Science (AREA)
  • Processing Of Solid Wastes (AREA)

Description

【技術分野】
【０００１】
この発明は、焼却設備等より排出される焼却飛灰の処理方法及び装置に係り、特に焼却飛灰をセメント製造用原料として利用する方法及び装置に関する。
【背景技術】
【０００２】
従来、可燃性の家庭ごみ廃棄物及び産業廃棄物は、廃棄物焼却施設のストーカ式焼却炉、流動床式焼却炉、溶融式焼却炉、ロータリーキルン、バッチ炉等において焼却され、焼却灰として廃棄物最終処分場に埋立て処分される。焼却灰のうち集塵機等で捕集される飛灰（ばいじん）は、塩素濃度が高く、重金属類及びダイオキシン類で過度に汚染されており、平成３年の廃棄物処理法の改正により特別管理一般廃棄物に指定されている。一方、焼却灰のうち焼却残渣として排出される主灰（炉底灰、炉下灰）の塩素濃度、重金属類濃度及びダイオキシン類濃度は、飛灰と比較するとはるかに少ない。しかしながら、廃棄物最終処分場の安全性を確保するため、最終処分される焼却灰中の重金属類の濃度やダイオキシン類の含有量が、法律で定められる所定値を超過するものについては、遮断型最終処分場に埋立て処分するか、溶融、セメント固化、ダイオキシン類の分解処理を行なった後、管理型最終処分場に埋立て処分することが義務づけられている。
【０００３】
ところで、廃棄物焼却施設より発生する焼却灰は、セメント原料として必要なＣａＯ、ＳｉＯ２、Ａｌ２Ｏ３及びＦｅ２Ｏ３等を含んでいるため、セメント焼成用の原料として十分に再資源化することができる。加えて、セメント焼成工程のなかで原料は１４００℃以上の高温に晒されるため、焼却灰中のダイオキシン類の分解が可能であるほか、重金属類はセメントクリンカ鉱物中に取り込まれて固定化することができる。
【０００４】
これらの理由により、近年、焼却灰を原料の一部に用いたセメント製造技術が確立され、焼却主灰及び焼却飛灰がセメントに再資源化されている。通常、焼却主灰は磁力選別による鉄分除去及びふるいによる異物除去のみを施してセメント原料とされる。一方、焼却飛灰にはＮａＣｌ等の形で塩素が高濃度で含まれており、キルンの安定操業及びセメントの品質に悪影響を及ぼさないように、水洗処理による塩素成分の除去の後にセメント原料化されている。
【発明の開示】
【発明が解決しようとする課題】
【０００５】
上述したように、特に焼却飛灰はダイオキシン類等の有害物質を多く含むことがあるが、セメント製造施設の配置上、焼却飛灰の水洗処理設備とセメント焼成設備は多くの場合互いに離れた場所に設置せざるを得ないため、各々の設備間をトラック等で輸送していた。従って、輸送途中で焼却飛灰が飛散することによる周辺環境への二次汚染を回避する方法が望まれている。
【０００６】
この発明はこのような問題点を解消するためになされたもので、周辺環境への二次汚染を防止しつつ焼却飛灰をセメント原料として利用することができる焼却飛灰の処理方法及び装置を提供することを目的とする。
【課題を解決するための手段】
【０００７】
本発明者は、飛灰ケークの物理的な性状を調査し、水分を含んだケークのまま密閉型のポンプを用いて配管内を圧送することにより、二次汚染の虞のない処理方法を考案するに至った。
【０００８】
ストーカ式焼却炉等の焼却設備から排出される飛灰には、通常、平均粒径３０μｍ程度の細かい粒子と、平均粒径５００μｍ程度の粗い粒子とが含まれている。この飛灰をスラリーとして輸送するために、適当な水分を添加して配管内を圧送しようとすると、配管中で粗い粒子が沈降分離して配管詰まりを起こす虞があった。
【０００９】
そこで、この発明においては、水洗脱塩後の飛灰ケークの水分量を調整した状態で飛灰ケークの流動性を高めることにより、粗い粒子が沈降分離することを防止した上で配管内へ圧送するようにした。
【００１０】
この発明に係る焼却飛灰の処理方法は、焼却施設から排出された焼却飛灰を水洗して脱塩し、脱塩した後の飛灰ケークを水分４５〜６０％に調整し、水分４５〜６０％に調整された飛灰ケークを混練することによりコンクリートスランプの値を２０ｃｍ以上とし、コンクリートスランプの値が２０ｃｍ以上となった後に飛灰ケークを密閉型のポンプにより配管内へ圧送する方法である。
なお、ニーダー又は２軸式ミキサーによって飛灰ケークを混練してもよい。
また、飛灰ケークの水分を４５〜６０％に調整する際に増粘剤を添加してもよい。
密閉型のポンプにより配管を介して飛灰ケークをセメント焼成用のキルンへ圧送することができる。
【００１１】
また、この発明に係る焼却飛灰の処理装置は、焼却施設から排出された焼却飛灰を水洗脱塩して水分４５〜６０％の飛灰ケークを形成する水洗手段と、水洗手段で形成された飛灰ケークの流動性をコンクリートスランプの値が２０ｃｍ以上となるように調整する混練機と、混練機で流動性が調整された飛灰ケークを配管内へ圧送する密閉型のポンプとを備えたものである。
なお、混練機としては、ニーダー又は２軸式ミキサーを使用することができる。
また、水洗手段としては、ベルトフィルタ、フィルタプレス、遠心分離機、ドラムフィルタ等の固液分離装置を用いることができる。
また、水洗手段において、飛灰ケークを形成する際に飛灰に増粘剤を添加してもよい。
【発明を実施するための最良の形態】
【００１２】
以下、この発明の実施の形態を添付図面に基づいて説明する。
図１にこの発明の実施の形態に係る焼却飛灰の処理方法の流れを概略的に示す。廃棄物焼却施設の焼却炉１から排出されてスラリーとされた焼却飛灰を固液分離するためのベルトフィルタ２が配設され、ベルトフィルタ２の直上に散水のためのスプレーノズル３が配置されている。ベルトフィルタ２の集水皿４には、固液分離後の水を浄化処理する水処理装置５が接続されている。また、ベルトフィルタ２の出口端には混練機６が配置され、混練機６に配管７及びホースポンプ８を介して密閉型のピストンポンプ９が接続されている。さらに、ピストンポンプ９に配管１０を介して図示しないセメント焼成用のキルンが接続されている。
【００１３】
焼却炉１から排出された焼却飛灰は、図示しない溶解槽で温水中でスラリーとされてベルトフィルタ２に供給され、上方のスプレーノズル３から散水されると共に下方から水分が真空吸引されつつベルトフィルタ２上を出口側へと移動する。すなわち、焼却飛灰はベルトフィルタ２上を移動しながら水洗脱塩され、直ちに固液分離がなされる。固液分離後の塩素成分が溶解した水は、ベルトフィルタ２の集水皿４に集められ、さらに水処理装置５へ送られ、ここで重金属類に対して適切な浄化処理がなされた後に排水される。
【００１４】
一方、塩素成分が除去されてベルトフィルタ２上に残留した固形物は、水分を含んだ飛灰ケークとなってベルトフィルタ２から排出される。このとき、飛灰ケークの水分が４５〜６０％となるように、ベルトフィルタ２の搬送速度、吸引の真空度、スプレーノズル３からの散水の流量等が調整される。なお、飛灰中の平均粒径５００μｍ程度の粗い粒子の含有量が多い場合には、ベルトフィルタ２から排出された飛灰ケークに水を添加して、水分４５〜６０％とすることもできる。
【００１５】
このようにして、水分４５〜６０％に調整された飛灰ケークは混練機６に供給され、コンクリートスランプの値が２０ｃｍ以上となるまで混練される。ここで、コンクリートスランプの値は、日本工業規格ＪＩＳ Ａ １１０１「コンクリートのスランプ試験方法」に準拠した試験により測定されるものとする。混練機６としては、ニーダーや２軸式ミキサー等の混練度の高いものを採用することが好ましい。
【００１６】
混練機６において流動性が調整された飛灰ケークは、ホースポンプ８により配管７内をピストンポンプ９へと送られ、さらにピストンポンプ９により配管１０内を図示しないセメント焼成用のキルンまで圧送される。これにより、飛灰ケークがキルンに安定供給され、セメントの製造が行われる。
【００１７】
なお、ベルトフィルタ２において水分４５〜６０％の飛灰ケークを形成する際に、飛灰に増粘剤を添加すれば、飛灰から平均粒径５００μｍ程度の粗い粒子が分離することを効果的に防止することができる。増粘剤は、通常、グラウト（セメント液注入）用、水中不分離性コンクリート用、高流動コンクリート用等に用いられるもので、具体的には、１）メチルセルロース、ヒドロキシプロピルメチルセルロース、ヒドロキシエチルセルロース等のセルロース系、２）ポリアクリルアミド、ポリアクリル酸ソーダ等のアクリル系、３）ポリビニルアルコール等の水溶性ポリマー、４）カードラン、ウェランガム等の多糖類の使用が可能である。また、高炉スラグ微粉末、フライアッシュ微粉末、石灰石微粉末等の無機系微粉末も増粘剤として使用することもできる。
【００１８】
また、ベルトフィルタ２の代わりに、フィルタプレス等を用いて固液分離を行うこともできる。
【００１９】
飛灰ケークを圧送する密閉型のポンプとしては、ピストンポンプ９の他、チューブ式、ロータ型あるいはダイヤフラム式のポンプ等を用いることもできる。
【００２０】
さらに、ホースポンプ８は、混練機６からピストンポンプ９へ飛灰ケークを送り込むためのものであり、混練機６とピストンポンプ９の位置関係によっては、ホースポンプ８を省略し、ピストンポンプ９のみで混練機６からキルンへ飛灰ケークを圧送することができる。
【００２１】
図２に示されるように、混練機６の代わりにタンク１１をベルトフィルタ２の出口端に配置し、水分４５〜６０％に調整された飛灰ケークをタンク１１内で撹拌貯蔵することにより、飛灰ケークの流動性をコンクリートスランプの値が２０ｃｍ以上となるように調整することも可能である。
【００２２】
以上説明したように、この発明によれば、周辺環境への二次汚染を防止しつつ焼却飛灰を配管内へ圧送し、セメント原料として利用することができる。飛灰ケークを水分４５〜６０％に調整し、コンクリートスランプの値が２０ｃｍ以上となった後に飛灰ケークを圧送するので、配管詰まりが防止されると共に不必要に多量の水分を添加することによる熱エネルギーロスを最小限に抑えることが可能となる。
【図面の簡単な説明】
【００２３】
【図１】この発明の実施の形態に係る焼却飛灰の処理方法の流れを概略的に示すフロー図である。
【図２】他の実施の形態に係る焼却飛灰の処理方法の流れを概略的に示すフロー図である。【Technical field】
[0001]
The present invention relates to a method and apparatus for treating incinerated fly ash discharged from incineration facilities and the like, and more particularly, to a method and apparatus for using incinerated fly ash as a raw material for producing cement.
[Background]
[0002]
Conventionally, combustible household waste and industrial waste have been incinerated in waste incineration facilities such as stoker type incinerators, fluidized bed incinerators, melting incinerators, rotary kilns, batch furnaces, etc. Landfilled at the final disposal site. Of the incinerated ash, fly ash collected by dust collectors, etc. has a high chlorine concentration and is excessively contaminated with heavy metals and dioxins. Special management is generally implemented by the revision of the Waste Management Law in 1991. Designated as waste. On the other hand, the chlorine concentration, heavy metal concentration, and dioxin concentration of main ash (furnace bottom ash, bottom ash) discharged from the incineration ash are much lower than that of fly ash. However, in order to ensure the safety of the final disposal site, if the concentration of heavy metals and the content of dioxins in the incinerated ash to be disposed of in excess of the prescribed values stipulated by law, It is obliged to landfill at the final disposal site or landfill at the managed final disposal site after melting, cement solidification, and dioxin decomposition.
[0003]
By the way, incineration ash generated from waste incineration facilities contains CaO, SiO 2 , Al 2 O 3, Fe 2 O 3, etc., which are necessary as cement raw materials, so they are sufficiently recycled as raw materials for cement firing. can do. In addition, since raw materials are exposed to high temperatures of 1400 ° C or higher in the cement firing process, dioxins in incineration ash can be decomposed, and heavy metals must be incorporated into cement clinker minerals and fixed. Can do.
[0004]
For these reasons, in recent years, cement manufacturing technology using incinerated ash as a part of raw materials has been established, and incinerated main ash and incinerated fly ash have been recycled into cement. Normally, incinerated main ash is used as a cement raw material by only removing iron by magnetic separation and removing foreign matter by sieving. On the other hand, incinerated fly ash contains a high concentration of chlorine in the form of NaCl, etc., so that it does not adversely affect the stable operation of the kiln and the quality of the cement, and after the removal of the chlorine component by water washing treatment, it is converted into a raw material for cement. Has been.
DISCLOSURE OF THE INVENTION
[Problems to be solved by the invention]
[0005]
As mentioned above, incineration fly ash may contain a lot of harmful substances such as dioxins, but due to the location of the cement production facility, incineration fly ash water washing treatment equipment and cement firing equipment are often separated from each other. Therefore, it was transported by truck between each equipment. Therefore, a method for avoiding secondary contamination to the surrounding environment due to incineration fly ash scattered during transportation is desired.
[0006]
The present invention was made to solve such problems, and a method and apparatus for treating incinerated fly ash capable of using incinerated fly ash as a cement raw material while preventing secondary contamination to the surrounding environment. The purpose is to provide.
[Means for Solving the Problems]
[0007]
The present inventor investigated the physical properties of the fly ash cake, and devised a treatment method free from the risk of secondary contamination by pumping the inside of the pipe using a hermetic pump with the moisture-containing cake. It came to do.
[0008]
Fly ash discharged from an incinerator such as a stoker-type incinerator usually contains fine particles having an average particle size of about 30 μm and coarse particles having an average particle size of about 500 μm. In order to transport the fly ash as a slurry, if an appropriate amount of water is added to try to pump the inside of the pipe, coarse particles may settle and separate in the pipe, causing clogging of the pipe.
[0009]
Therefore, in the present invention, by increasing the fluidity of the fly ash cake after adjusting the water content of the fly ash cake after washing and desalting, the coarse particles are prevented from settling and separating into the pipe. I was pumped.
[0010]
Processing method of incineration fly ash according to the present invention is washed with water incineration fly ash discharged from incineration facilities desalted, fly ash cake after desalted adjusted moisture 45-60% moisture 45 By kneading the fly ash cake adjusted to 60%, the value of the concrete slump is set to 20 cm or more, and after the value of the concrete slump reaches 20 cm or more, the fly ash cake is pumped into the pipe by a sealed pump. is there.
Note that the fly ash cake may be kneaded by a kneader or a biaxial mixer.
Moreover, you may add a thickener when adjusting the water | moisture content of a fly ash cake to 45 to 60%.
The fly ash cake can be pumped to the cement firing kiln through a pipe by a hermetic pump.
[0011]
Further, the incineration fly ash treatment apparatus according to the present invention is formed by a water washing means for forming a fly ash cake having a moisture content of 45 to 60% by washing and desalting the incineration fly ash discharged from the incineration facility, and a water washing means. a kneader to adjust the fluidity of the fly ash cake is such that the value of the concrete slump is more than 20 cm, and a sealed pump for pumping fly ash cake fluidity is adjusted with a kneading machine to the pipe It is provided.
In addition, as a kneader, a kneader or a biaxial mixer can be used.
Further, as the water washing means, a solid-liquid separation device such as a belt filter, a filter press, a centrifuge, or a drum filter can be used.
Further, in the water washing means, a thickener may be added to the fly ash when forming the fly ash cake.
BEST MODE FOR CARRYING OUT THE INVENTION
[0012]
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 schematically shows a flow of a method for treating incinerated fly ash according to an embodiment of the present invention. A belt filter 2 for solid-liquid separation of the incineration fly ash discharged from the incinerator 1 of the waste incineration facility into a slurry is disposed, and a spray nozzle 3 for watering is disposed immediately above the belt filter 2. ing. A water treatment device 5 for purifying water after solid-liquid separation is connected to the water collecting tray 4 of the belt filter 2. A kneader 6 is disposed at the outlet end of the belt filter 2, and a hermetic piston pump 9 is connected to the kneader 6 via a pipe 7 and a hose pump 8. Furthermore, a cement firing kiln (not shown) is connected to the piston pump 9 via a pipe 10.
[0013]
The incineration fly ash discharged from the incinerator 1 is made into a slurry in warm water in a melting tank (not shown) and supplied to the belt filter 2, sprayed from the upper spray nozzle 3, and water is vacuum sucked from below while the belt is sucked. Move on the filter 2 to the outlet side. That is, the incinerated fly ash is washed and desalted while moving on the belt filter 2, and solid-liquid separation is immediately performed. The water in which the chlorine component after the solid-liquid separation is dissolved is collected in the water collecting tray 4 of the belt filter 2 and further sent to the water treatment device 5 where the heavy metal is appropriately purified and drained. Is done.
[0014]
On the other hand, the solid matter remaining on the belt filter 2 from which the chlorine component has been removed becomes a fly ash cake containing moisture and is discharged from the belt filter 2. At this time, the conveyance speed of the belt filter 2, the vacuum degree of suction, the flow rate of water spray from the spray nozzle 3 and the like are adjusted so that the moisture of the fly ash cake is 45 to 60%. In addition, when there is much content of coarse particle | grains with an average particle diameter of about 500 micrometers in fly ash, water can be added to the fly ash cake discharged | emitted from the belt filter 2, and it can also be set to moisture 45-60%. .
[0015]
Thus, the fly ash cake adjusted to moisture of 45 to 60% is supplied to the kneader 6 and kneaded until the value of the concrete slump becomes 20 cm or more. Here, the value of the concrete slump shall be measured by a test in accordance with Japanese Industrial Standard JIS A 1101 “Concrete Slump Test Method”. As the kneading machine 6, it is preferable to employ a kneading machine such as a kneader or a biaxial mixer.
[0016]
The fly ash cake whose fluidity is adjusted in the kneader 6 is sent to the piston pump 9 through the pipe 7 by the hose pump 8, and further sent to the cement firing kiln (not shown) by the piston pump 9. The Thereby, a fly ash cake is stably supplied to a kiln, and manufacture of a cement is performed.
[0017]
In addition, when forming a fly ash cake having a moisture content of 45 to 60% in the belt filter 2, it is effective to separate coarse particles having an average particle size of about 500 μm from the fly ash by adding a thickener to the fly ash. Can be prevented. Thickeners are usually used for grout (cement liquid injection), underwater inseparable concrete, high fluid concrete, etc. Specifically, 1) such as methylcellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose, etc. Cellulose, 2) acrylics such as polyacrylamide and sodium polyacrylate, 3) water-soluble polymers such as polyvinyl alcohol, 4) polysaccharides such as curdlan and welan gum can be used. Inorganic fine powders such as blast furnace slag fine powder, fly ash fine powder, and limestone fine powder can also be used as a thickener.
[0018]
Moreover, solid-liquid separation can be performed using a filter press or the like instead of the belt filter 2.
[0019]
As a sealed pump for pumping the fly ash cake, in addition to the piston pump 9, a tube type, rotor type or diaphragm type pump can be used.
[0020]
Further, the hose pump 8 is for feeding fly ash cake from the kneading machine 6 to the piston pump 9. Depending on the positional relationship between the kneading machine 6 and the piston pump 9, the hose pump 8 is omitted and only the piston pump 9 is used. The fly ash cake can be pumped from the kneader 6 to the kiln.
[0021]
As shown in FIG. 2, the tank 11 is disposed at the outlet end of the belt filter 2 instead of the kneader 6, and the fly ash cake adjusted to a moisture content of 45 to 60% is stirred and stored in the tank 11. It is also possible to adjust the fluidity of the fly ash cake so that the value of the concrete slump is 20 cm or more.
[0022]
As described above, according to the present invention, incinerated fly ash can be pumped into a pipe and used as a cement raw material while preventing secondary contamination to the surrounding environment. By adjusting the fly ash cake to a moisture content of 45-60% and feeding the fly ash cake after the concrete slump value reaches 20 cm or more, clogging of the piping is prevented and an excessive amount of moisture is added. Thermal energy loss can be minimized.
[Brief description of the drawings]
[0023]
FIG. 1 is a flowchart schematically showing a flow of a method for treating incinerated fly ash according to an embodiment of the present invention.
FIG. 2 is a flowchart schematically showing a flow of a method for treating incinerated fly ash according to another embodiment.

Claims (8)

焼却施設から排出された焼却飛灰を水洗して脱塩し、
脱塩した後の飛灰ケークを水分４５〜６０％に調整し、
水分４５〜６０％に調整された飛灰ケークを混練することによりコンクリートスランプの値を２０ｃｍ以上とし、
コンクリートスランプの値が２０ｃｍ以上となった後に飛灰ケークを密閉型のポンプにより配管内へ圧送する
ことを特徴とする焼却飛灰の処理方法。The incineration fly ash discharged from the incineration facility is washed with water and desalted,
Adjust the fly ash cake after desalting to moisture of 45-60%,
By kneading the fly ash cake adjusted to a moisture of 45-60%, the value of the concrete slump is 20 cm or more,
A method for treating incinerated fly ash, characterized in that after the concrete slump value reaches 20 cm or more, the fly ash cake is pumped into the pipe by a sealed pump. ニーダー又は２軸式ミキサーによって前記飛灰ケークを混練する請求項１に記載の焼却飛灰の処理方法。The method for treating incinerated fly ash according to claim 1, wherein the fly ash cake is kneaded by a kneader or a biaxial mixer. 飛灰ケークの水分を４５〜６０％に調整する際に増粘剤を添加する請求項１または２に記載の焼却飛灰の処理方法。The method for treating incinerated fly ash according to claim 1 or 2 , wherein a thickener is added when the moisture of the fly ash cake is adjusted to 45 to 60%. 密閉型のポンプにより配管を介して飛灰ケークをセメント焼成用のキルンへ圧送する請求項１〜３のいずれか一項に記載の焼却飛灰の処理方法。The method for treating incinerated fly ash according to any one of claims 1 to 3, wherein the fly ash cake is pumped to a cement firing kiln through a pipe by a sealed pump. 焼却施設から排出された焼却飛灰を水洗脱塩して水分４５〜６０％の飛灰ケークを形成する水洗手段と、
前記水洗手段で形成された飛灰ケークの流動性をコンクリートスランプの値が２０ｃｍ以上となるように調整する混練機と、
前記混練機で流動性が調整された飛灰ケークを配管内へ圧送する密閉型のポンプと
を備えたことを特徴とする焼却飛灰の処理装置。Washing means for washing and desalting the incinerated fly ash discharged from the incineration facility to form a fly ash cake having a moisture content of 45 to 60%;
A kneader for adjusting the fluidity of the fly ash cake formed by the water washing means so that the value of the concrete slump is 20 cm or more;
An incineration fly ash treatment apparatus, comprising: a sealed pump that pumps a fly ash cake whose flowability is adjusted by the kneader into a pipe. 前記混練機は、ニーダー又は２軸式ミキサーである請求項５に記載の焼却飛灰の処理装置。The incinerator fly ash treatment apparatus according to claim 5, wherein the kneader is a kneader or a biaxial mixer. 前記水洗手段は、ベルトフィルタ、フィルタプレス、遠心分離機及びドラムフィルタのうちのいずれかを含む請求項５または６に記載の焼却飛灰の処理装置。The incineration fly ash treatment apparatus according to claim 5 or 6 , wherein the water washing means includes any one of a belt filter, a filter press, a centrifuge, and a drum filter. 前記水洗手段において、前記飛灰ケークを形成する際に前記飛灰に増粘剤が添加される、請求項５〜７のいずれか一項に記載の焼却飛灰の処理装置。The incinerator fly ash treatment apparatus according to any one of claims 5 to 7, wherein in the water washing means, a thickener is added to the fly ash when the fly ash cake is formed.
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