JP2007253029A - Incineration residue treatment method and incineration residue treated matter - Google Patents
Incineration residue treatment method and incineration residue treated matter Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 48
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 60
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- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 15
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
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- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 159000000014 iron salts Chemical class 0.000 description 1
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本発明は、焼却炉、溶融炉などの排ガス処理にともなって発生する飛灰、又は焼却処理等で生じる主灰（焼却灰）などの焼却残渣を処理するための焼却残渣処理方法、及びこの焼却残渣処理方法によって得られる焼却残渣処理物に関する。 The present invention relates to an incineration residue treatment method for treating incineration residues such as fly ash generated during exhaust gas treatment of incinerators, melting furnaces, etc., or main ash (incineration ash) produced by incineration, etc., and this incineration The present invention relates to an incineration residue treatment product obtained by a residue treatment method.
焼却炉、溶融炉などの燃焼設備では、排ガス処理にともなって飛灰が発生するが、飛灰が大気中に放出されるのを防止するために、電気集塵機やバグフィルタ等を備えた集塵装置を用いて飛灰を回収している。特に産業廃棄物、一般廃棄物などを焼却処理することにより発生する飛灰には、多種雑多な成分が含まれており、その成分、含有量もまちまちである。しかし、このように成分等が一定しない廃棄物であっても、２次汚染等の防止のため、環境に影響を及ぼさないように飛灰を処理しなければならない。 In combustion facilities such as incinerators and melting furnaces, fly ash is generated during exhaust gas treatment, but in order to prevent the fly ash from being released into the atmosphere, a dust collector equipped with an electric dust collector or bag filter is used. Fly ash is collected using the device. In particular, fly ash generated by incineration of industrial waste, general waste, and the like contains a variety of components, and the components and contents vary. However, even in the case of wastes whose components and the like are not constant, fly ash must be treated so as not to affect the environment in order to prevent secondary contamination.
この飛灰中には、場合によっては、銅、鉄、亜鉛、鉛等の有価金属の酸化物、化合物等が含まれており、それらの金属成分を抽出できれば資源として利用できることになる。更に、焼却で発生する塩化水素ガスや硫黄酸化物（ＳＯｘ）などの酸性ガスを中和・除去するために、消石灰（主成分はＣａ（ＯＨ）２）を煙道などに吹き込む場合が多く、その場合には、飛灰中に、Ｃａ（ＯＨ）２、ＣａＳＯ４、ＣａＣｌ２などが含有される場合が多い。 In some cases, the fly ash contains oxides, compounds, etc. of valuable metals such as copper, iron, zinc, lead, etc. If these metal components can be extracted, they can be used as resources. Furthermore, in order to neutralize and remove acidic gases such as hydrogen chloride gas and sulfur oxide (SOx) generated by incineration, slaked lime (the main component is Ca (OH) 2 ) is often blown into the flue, etc. In that case, Ca (OH) 2 , CaSO 4 , CaCl 2 and the like are often contained in the fly ash.
飛灰を処理する技術としては、下記の特許文献１に示されるように、廃液中のＣＯＤ（化学的酸素要求量、Ｃｈｅｍｉｃａｌ Ｏｘｙｇｅｎ Ｄｅｍａｎｄ）成分を湿式に処理する方法が知られている。また、飛灰を乾式処理する方法として、下記の特許文献２には、飛灰に塩基を添加して、熱処理することを特徴とする飛灰の処理方法が提案されている。 As a technique for treating fly ash, as shown in Patent Document 1 below, a method of treating a COD (Chemical Oxygen Demand) component in a waste liquid in a wet process is known. Further, as a method for dry-treating fly ash, Patent Document 2 below proposes a fly ash treatment method characterized by adding a base to fly ash and heat-treating it.
しかしながら、上記の発明は、いずれもカルシウム成分の回収を目的とするものではなく、カルシウム成分の回収に関する開示は存在しない。また、一般的に、湿式処理によって特定成分の回収を行う場合、含水状態では回収物の搬送重量が大きく、取扱い性にも劣るため、回収物の乾燥工程が必要になるといった問題がある。 However, none of the above-described inventions are intended to recover the calcium component, and there is no disclosure regarding the recovery of the calcium component. Further, generally, when recovering a specific component by wet processing, there is a problem that a drying step of the recovered product is required because the transported weight of the recovered product is large and the handling property is poor in a water-containing state.
一方、焼却処理等で生じる主灰にも、飛灰と同様に重金属や塩化カルシウムが含有され、更に酸化カルシウム、二酸化珪素（シリカ）、酸化アルミニウム（アルミナ）、酸化第二鉄などが含有される場合がある。このため、酸化カルシウム等を回収して、セメント原料に利用する技術が存在するが、その用途では、塩化カルシウムや重金属を除去するのが望ましい。 On the other hand, the main ash produced by incineration treatment contains heavy metals and calcium chloride as well as fly ash, and further contains calcium oxide, silicon dioxide (silica), aluminum oxide (alumina), ferric oxide and the like. There is a case. For this reason, there exists a technique for recovering calcium oxide or the like and using it as a cement raw material. However, it is desirable to remove calcium chloride and heavy metals in that application.
そこで、本発明の目的は、不要成分を増加させずに必要なカルシウム成分を回収することができ、回収物の乾燥工程を不要にできるためコスト的にも有利な焼却残渣処理方法、及びこの処理方法によって得られる焼却残渣処理物を提供することにある。 Therefore, an object of the present invention is to recover a necessary calcium component without increasing an unnecessary component, and to eliminate a drying step of the recovered material, so that an incineration residue treatment method that is advantageous in terms of cost, and this treatment It is providing the incineration residue processed material obtained by a method.
本発明者らは、上記目的を達成すべく、湿式処理で飛灰等を処理する方法について鋭意研究したところ、水洗後の水分付着ケーキに酸化カルシウムを添加することで、不要成分を増加させずに、化学反応と蒸発により水分除去が可能になることを見出し、本発明を完成するに至った。 In order to achieve the above-mentioned object, the present inventors diligently studied a method for treating fly ash and the like by wet treatment, and by adding calcium oxide to the water-adhered cake after washing, the unnecessary components are not increased. In addition, the present inventors have found that moisture can be removed by chemical reaction and evaporation, and have completed the present invention.
即ち、本発明の焼却残渣処理方法は、焼却残渣の水洗および固液分離を含む処理により水分付着ケーキを得る第1工程と、その水分付着ケーキに酸化カルシウムを添加して水酸化カルシウムを生成させる第2工程とを含むことを特徴とする。ここで、水分付着ケーキとは付着水分を含有するケーキをさし、脱水工程を経た脱水ケーキなども含まれる。 That is, the incineration residue treatment method of the present invention includes a first step of obtaining a moisture-adhering cake by a treatment including washing of the incineration residue and solid-liquid separation, and adding calcium oxide to the moisture-adhering cake to generate calcium hydroxide. And a second step. Here, the moisture-attached cake refers to a cake containing attached moisture, and includes a dehydrated cake that has undergone a dehydration step.
本発明の焼却残渣処理方法によると、第1工程によって、飛灰等に含まれる水溶性成分（例えば、金属精錬用途に有害なＣａＣｌ２等）を水洗・除去して、有用なカルシウム成分（例えば、Ｃａ（ＯＨ）２、ＣａＳＯ４等）を効率良く、水分付着ケーキとして回収することができる。更に、第２工程において、水分付着ケーキに酸化カルシウムを添加することで、水との反応により水分が除去され、その際に生じる反応熱によって水分の蒸発（気化）が生じるため、特に乾燥工程を行わなくても、水分を十分に除去することが可能になる。更に、酸化カルシウムを添加し、これが全部又は一部だけ水酸化カルシウムになるため、不要成分を増加させずに、必要なカルシウム成分を回収することができる。 According to the incineration residue treatment method of the present invention, in the first step, water-soluble components contained in fly ash and the like (for example, CaCl 2 harmful to metal refining applications) are washed and removed, and useful calcium components (for example, , Ca (OH) 2 , CaSO 4, etc.) can be efficiently recovered as a moisture adhesion cake. Furthermore, in the second step, by adding calcium oxide to the moisture-adhering cake, moisture is removed by reaction with water, and moisture evaporation (vaporization) occurs due to reaction heat generated at that time. Even if it is not performed, it becomes possible to sufficiently remove moisture. Furthermore, since calcium oxide is added and becomes all or part of calcium hydroxide, the necessary calcium component can be recovered without increasing unnecessary components.
上記において、前記水分付着ケーキ中の付着水分の重量に対して、前記酸化カルシウムを１〜３倍の重量で添加することが好ましい。この範囲の重量で酸化カルシウムを添加すると、化学反応と蒸発による水分除去がより確実に行え、過剰な酸化カルシウムの添加も避けることができる。 In the above, it is preferable to add 1 to 3 times the weight of the calcium oxide with respect to the weight of the adhered moisture in the moisture adhered cake. When calcium oxide is added in a weight within this range, moisture removal by chemical reaction and evaporation can be performed more reliably, and addition of excess calcium oxide can also be avoided.
また、前記焼却残渣が飛灰の場合、前記第１工程が重金属の凝集沈殿処理を含むものであることが好ましい。飛灰を処理する場合、重金属の凝集沈殿処理を行うことによって、水洗の廃液中から重金属を除去することができ廃液処理が軽減でき、また、飛灰処理物に重金属が含有されていても、特定の金属精錬工程や焼却設備などに対しては、重金属の含有が問題となる場合は少ない。 Moreover, when the said incineration residue is fly ash, it is preferable that the said 1st process includes the aggregation precipitation process of a heavy metal. When processing fly ash, heavy metal can be removed from the waste liquid of washing by reducing the waste liquid treatment by aggregating and precipitating the heavy metal, and even if heavy metal is contained in the fly ash treatment product, For specific metal refining processes and incineration facilities, the inclusion of heavy metals is rare.
一方、本発明の焼却残渣処理物は、上記いずれかに記載の本発明の焼却残渣処理方法によって得られる焼却残渣処理物である。本発明の焼却残渣処理物によると、上記の如き作用効果によって、不要成分を増加させずに必要なカルシウム成分が十分回収されており、含水量が小さいため、搬送重量が小さく取扱い性にも優れたものとなる。また、製造コスト的にも有利な焼却残渣処理物となる。 On the other hand, the incineration residue processed product of the present invention is an incineration residue processed product obtained by the incineration residue processing method of the present invention described above. According to the incineration residue-treated product of the present invention, the necessary calcium components are sufficiently recovered without increasing unnecessary components due to the above-described effects, and since the water content is small, the transport weight is small and the handleability is excellent. It will be. In addition, the incineration residue treatment product is advantageous in terms of manufacturing cost.
以下、本発明の実施の形態について、図面を参照しながら説明する。図１は、本発明の焼却残渣処理方法の一例（飛灰を処理する場合）を示す工程図である。図３は、本発明の焼却残渣処理方法の他の例（主灰を処理する場合）を示す工程図である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a process diagram showing an example of the incineration residue treatment method of the present invention (when fly ash is treated). FIG. 3 is a process diagram showing another example of the incineration residue treatment method of the present invention (when main ash is treated).
本発明の焼却残渣処理方法は、図１に示すように、焼却残渣の水洗および固液分離を含む処理により水分付着ケーキを得る第1工程を含むものである。この工程によって、飛灰等に含まれる水溶性成分（例えば、金属精錬用途に有害なＣａＣｌ２等）を水洗・除去することができる。 As shown in FIG. 1, the incineration residue treatment method of the present invention includes a first step of obtaining a moisture-attached cake by a treatment including washing of the incineration residue and solid-liquid separation. By this step, water-soluble components (for example, CaCl 2 that is harmful to metal refining applications) contained in fly ash and the like can be washed and removed.
処理対象としては、飛灰又は主灰等が挙げられるが、飛灰としては、例えば産業廃棄物、一般廃棄物等を焼却処理した際に発生する飛灰や、廃棄物等をそのまま溶融処理した際に発生する飛灰が含まれる。代表的なものとして、焼却設備においてバグフィルタ等で捕集された飛灰などがあげられる。また、処理対象となる主灰としては、例えば産業廃棄物、一般廃棄物等を焼却処理した際に生じる主灰が挙げられる。 Examples of treatment targets include fly ash or main ash, but as fly ash, for example, fly ash generated when incinerating industrial waste, general waste, etc., or melted waste as it is The fly ash generated at the time is included. A typical example is fly ash collected by a bag filter or the like in an incineration facility. Moreover, as main ash used as a process target, the main ash produced, for example when industrial waste, general waste, etc. are incinerated.
本発明は、飛灰がカルシウム成分をＣａＯ換算で２０重量％以上含有する場合に有効であり、３０重量％以上含有する場合に特に有効となる。このような飛灰は、焼却で発生する酸性ガスを中和・除去するために、消石灰（主成分はＣａ（ＯＨ）２）を煙道などに吹き込む場合に得られ、その場合には、飛灰がＣａ（ＯＨ）２、ＣａＳＯ４、ＣａＣｌ２などを主として含有する。 The present invention is effective when the fly ash contains a calcium component of 20% by weight or more in terms of CaO, and is particularly effective when the fly ash contains 30% by weight or more. Such fly ash is obtained when slaked lime (the main component is Ca (OH) 2 ) is blown into a flue or the like in order to neutralize and remove the acid gas generated by incineration. Ash mainly contains Ca (OH) 2 , CaSO 4 , CaCl 2 and the like.
水洗に使用する水は、水道水、工業用水などが使用でき、必要により温水を用いることも可能である。水洗は、バッチ処理、循環水洗、連続水洗などいずれでもよいが、循環水洗の場合、ＣａＣｌ２等の濃度が高くなり過ぎないように、一部の水を追加・放出するのが好ましい。逆に、ＣａＣｌ２等の回収をも目的とする場合、少量の水（例えば、焼却残渣重量の５倍以下）を用いるのが好ましい。 The water used for washing can be tap water, industrial water or the like, and hot water can be used if necessary. The water washing may be any of batch processing, circulating water washing, continuous water washing, and the like, but in the case of circulating water washing, it is preferable to add and release some water so that the concentration of CaCl 2 and the like does not become too high. On the other hand, when the purpose is to recover CaCl 2 or the like, it is preferable to use a small amount of water (for example, 5 times or less the weight of the incineration residue).
水洗は、撹拌操作を伴うのが好ましく、混合撹拌槽を用いて水洗を行うことが好ましい。 Washing with water is preferably accompanied by a stirring operation, and it is preferable to perform washing with a mixed stirring tank.
焼却残渣の水洗および固液分離を含む処理は、水洗と固液分離とからなる処理（水洗と固液分離とを同時に行ってもよい）であってもよいが、焼却残渣から溶出した重金属を凝集沈殿させるための凝集沈殿処理を含んでいてもよい。あるいは、活性炭槽を通過させて重金属を吸着させてもよく、その場合、吸着後の活性炭を焼却すればよい。焼却残渣に含まれる重金属としては、亜鉛、鉛、クロム、銀、水銀、カドミウムなどが挙げられる。 The treatment including water washing and solid-liquid separation of the incineration residue may be a treatment comprising water washing and solid-liquid separation (water washing and solid-liquid separation may be performed simultaneously), but heavy metals eluted from the incineration residue A coagulation sedimentation treatment for coagulation sedimentation may be included. Alternatively, the heavy metal may be adsorbed by passing through an activated carbon tank. In that case, the activated carbon after the adsorption may be incinerated. Examples of heavy metals contained in the incineration residue include zinc, lead, chromium, silver, mercury, cadmium and the like.
凝集剤としては、キレート剤、高分子凝集剤、ＰＡＣ(ポリ塩化アルミニウム)、硫酸バンド、鉄塩などを用いることができる。このような凝集沈殿処理を行う場合、集泥機構を有する沈殿濃縮装置、例えばシックナー等を用いて、集泥を行うことが好ましい。 As the flocculant, chelating agents, polymer flocculants, PAC (polyaluminum chloride), sulfate bands, iron salts, and the like can be used. When such a coagulation sedimentation process is performed, it is preferable to perform the mud collection using a precipitation concentrator having a mud collection mechanism, such as a thickener.
凝集沈殿処理を行う場合、必要に応じて中和剤を添加して中和処理した後、キレート剤で重金属をキレート化し、無機系凝集剤でフロック形成し、更に、高分子凝集剤でフロックの沈降速度を高めるのが好ましい。これらの添加量などの条件は、従来公知の条件が何れも採用でき、焼却残渣中の成分に応じて、薬剤や添加量が適宜選択される。 When coagulating and precipitating, if necessary, neutralize by adding a neutralizing agent, then chelate heavy metals with a chelating agent, form flocs with an inorganic coagulant, and further add flocs with a polymeric coagulant. It is preferable to increase the sedimentation rate. Conventionally known conditions can be adopted for these addition amounts and other conditions, and the chemicals and addition amounts are appropriately selected according to the components in the incineration residue.
図１に示す工程図では、１系統の流れによって、水洗、凝集沈殿処理、及び固液分離を行っているが、これを２系統に分けて、一方で水洗、凝集沈殿処理、及び固液分離を行い、他方で水洗、及び固液分離を行うようにしてもよい。 In the process diagram shown in FIG. 1, water washing, coagulation sedimentation treatment, and solid-liquid separation are performed by one system flow, but this is divided into two systems, while water washing, coagulation sedimentation treatment, and solid-liquid separation are performed. May be performed, and on the other hand, water washing and solid-liquid separation may be performed.
固液分離は、このようなスラリー又は泥を、水分付着ケーキと水分に分離する処理であり、例えば、遠心脱水機、フィルタプレス、ベルトプレス、真空脱水機、スクリュプレスなどを用いて行うことができる。 Solid-liquid separation is a process of separating such slurry or mud into a moisture-adhering cake and moisture, and can be performed using, for example, a centrifugal dehydrator, a filter press, a belt press, a vacuum dehydrator, a screw press, or the like. it can.
固液分離後の水分付着ケーキは、例えば付着水分量（重量％）として、３０〜８０重量％の水分を含有しているが、本発明では、６０重量％以上の水分を含有する水分付着ケーキでも、次の第２工程によって、水分付着ケーキの十分な乾燥を行うことができる。 The moisture-attached cake after solid-liquid separation contains, for example, 30 to 80% by weight of moisture as the amount of attached moisture (% by weight). In the present invention, the moisture-attached cake contains 60% by weight or more of moisture. However, the moisture-adhering cake can be sufficiently dried by the next second step.
本発明の焼却残渣処理方法は、水分付着ケーキに酸化カルシウムを添加して水酸化カルシウムを生成させる第2工程を含むものである。この第2工程によって、水分付着ケーキ中の水分と、酸化カルシウムとの反応により、水分が除去され、その際に生じる反応熱によって水分の蒸発が生じるため、特に乾燥工程を行わなくても、水分を十分に除去することが可能になる。 The incineration residue treatment method of the present invention includes a second step of generating calcium hydroxide by adding calcium oxide to a moisture-adhering cake. In this second step, moisture is removed by the reaction between the moisture in the moisture-adhering cake and calcium oxide, and the evaporation of moisture occurs due to the reaction heat generated at that time. Can be sufficiently removed.
酸化カルシウムの添加は、主成分として酸化カルシウムを含むものが使用でき、例えば市販の生石灰などを用いることができる。添加を行う際には、反応を効率良く行い、反応物の固化等を防止する観点から、水分付着ケーキ等の混合・撹拌を行うことが好ましい。従って、本発明では、混合装置を備えた消化反応機を用いるのが好ましい。 For the addition of calcium oxide, one containing calcium oxide as a main component can be used, and for example, commercially available quicklime can be used. When the addition is performed, it is preferable to mix and stir the moisture-adhered cake and the like from the viewpoint of efficiently performing the reaction and preventing the reaction product from solidifying. Therefore, in the present invention, it is preferable to use a digestion reactor equipped with a mixing device.
また、酸化カルシウムの粒度は１０ｍｍ以下のものが望ましく、粉末状が特に望ましい。酸化カルシウムの添加は、水分付着ケーキ中の付着水分の重量に対して、前記酸化カルシウムを１〜３倍の重量で添加するのが好ましく、より好ましくは、１．５〜２．５倍の重量である。酸化カルシウムの添加量が、１倍未満であると、化学反応と蒸発による水分除去が不十分になる場合がある。 The particle size of calcium oxide is desirably 10 mm or less, and powder is particularly desirable. The addition of calcium oxide is preferably performed by adding 1 to 3 times the weight of the calcium oxide, more preferably 1.5 to 2.5 times the weight of the attached moisture in the moisture-attached cake. It is. If the amount of calcium oxide added is less than 1 time, chemical reaction and water removal by evaporation may be insufficient.
また、この第2工程において、処理物の温度変化の最大値が９０℃以上となるように処理することが好ましい。反応熱を利用して、処理物の温度変化の最大値を９０℃以上とすることによって、水分の蒸発を効果的に行うことができ、処理もより迅速に行うことができる。このため、消化反応機は、保温機構を備えたものが好ましい。 Further, in this second step, it is preferable to perform the treatment so that the maximum value of the temperature change of the treated product is 90 ° C. or more. By making the maximum value of the temperature change of the processed material 90 ° C. or more using the heat of reaction, moisture can be effectively evaporated and the processing can be performed more quickly. For this reason, the digestion reactor is preferably equipped with a heat retaining mechanism.
第2工程では、水分の蒸発と共に粉塵が生じるが、湿った粉塵はバグフィルタ等の目詰まりなどの原因となるため、これをバーナなどで加熱して、バグフィルタ等の集塵機で捕集するのが好ましい。捕集したものは、第2工程の原料に添加して再利用することができる。 In the second step, dust is generated as the water evaporates, but the wet dust causes clogging of the bag filter, etc., so it is heated with a burner and collected with a dust collector such as a bag filter. Is preferred. The collected material can be added to the raw material of the second step and reused.
第2工程で得られた処理物は、付着水分量として０．２重量％以下が好ましい。この付着水分量を超えると、輸送途中で塊状になるなどの問題が生じる傾向がある。また、未反応の酸化カルシウムの含有量は０．２重量％以下が好ましい。一方、処理物の防塵対策として、１０重量％程度の水分を含有させる場合があるが、このようなケースでも、本発明では、酸化カルシウムの添加量を少なくすることによって、処理物の含水量をコントロールすることができる。 The treated product obtained in the second step is preferably 0.2% by weight or less in terms of moisture content. If this amount of adhering moisture is exceeded, there is a tendency that problems such as lumps occur during transportation. Further, the content of unreacted calcium oxide is preferably 0.2% by weight or less. On the other hand, about 10% by weight of water may be contained as a dust-proof measure for the treated product. Even in such a case, in the present invention, the moisture content of the treated product is reduced by reducing the amount of calcium oxide added. Can be controlled.
第2工程で得られた処理物は、例えば、熟成機中で、未反応物の反応や経時的な変化が終了した後、分級機で粗粒や不純物などが除去され、最終処理物が貯槽に蓄えられる。 The processed product obtained in the second step is, for example, in the aging machine, after the reaction of unreacted materials and changes over time are completed, coarse particles and impurities are removed with a classifier, and the final processed product is stored in the storage tank. Stored in
以上で得られる本発明における飛灰処理物は、Ｃａ（ＯＨ）２、ＣａＳＯ４、重金属などを含んでおり、金属精錬（亜鉛、鉛等）において鉱石を焼結する工程のカルシウム材や、金属精錬の湿式工程のアルカリ中和剤として用いることができる。また、焼却設備におけるアルカリ造滓剤として用いることができる。 The fly ash treated product in the present invention obtained as described above contains Ca (OH) 2 , CaSO 4 , heavy metal, etc., and a calcium material or metal in the step of sintering ore in metal refining (zinc, lead, etc.) It can be used as an alkali neutralizing agent in a refining wet process. Moreover, it can be used as an alkaline fouling agent in incineration facilities.
次に、図３に基づいて、主灰を処理する場合について説明する。主灰を処理する場合、焼却残渣の水洗および固液分離を含む処理により水分付着ケーキを得る第1工程において、重金属を水中に溶出させて、固液分離する水分付着ケーキから重金属を除去するのが、最終処理物をセメントの製造原料として利用する上で好ましい。 Next, the case where main ash is processed will be described with reference to FIG. When treating the main ash, in the first step of obtaining a moisture-attached cake by washing with incineration residue and solid-liquid separation, heavy metals are eluted in water to remove heavy metals from the moisture-attached cake to be solid-liquid separated. However, it is preferable to use the final treated product as a raw material for producing cement.
例えば、図３に示すように、硫酸等の無機酸を用いてｐＨを下げることによって、重金属を水中に溶出させ易くなり、上澄をシックナーで分離した後、中和剤を添加し、キレート剤、高分子凝集剤などで重金属を沈殿させる。この沈殿物をシックナーから取り出してプレスにより脱水することで、水分付着ケーキ（重金属含有物）が得られるが、この水分付着ケーキは、前述した飛灰処理の第２工程に用いることができる。 For example, as shown in FIG. 3, by reducing the pH using an inorganic acid such as sulfuric acid, it becomes easier to elute heavy metals into water, and after the supernatant is separated by a thickener, a neutralizing agent is added and a chelating agent is added. Then, heavy metals are precipitated with a polymer flocculant or the like. The precipitate is taken out from the thickener and dehydrated with a press to obtain a moisture-attached cake (heavy metal-containing material). The moisture-attached cake can be used in the second step of the fly ash treatment described above.
一方、水洗後に必要により凝沈剤（高分子凝集剤他）を添加して、重金属が除去された沈殿物は、シックナーで分離され、プレスにより脱水することで、水分付着ケーキ（重金属除去物）が得られる。その後の工程は、飛灰処理の場合と同じであり、消化機において、水分付着ケーキに酸化カルシウムを添加して水酸化カルシウムを生成させる第2工程が実施される。 On the other hand, if necessary, a coagulant (polymer flocculant, etc.) is added after washing with water, and the precipitate from which heavy metals have been removed is separated by a thickener and dehydrated with a press to give a cake with moisture adhesion (heavy metal removed product). Is obtained. The subsequent steps are the same as in the fly ash treatment, and the second step of generating calcium hydroxide by adding calcium oxide to the moisture-attached cake is performed in the digester.
このようにして得られた本発明における主灰処理物は、Ｃａ（ＯＨ）２、シリカ、アルミナなどを含んでおり、セメントの製造原料として好適に利用することができる。また、溶融炉等スラグを製造する場合の造滓剤として有効利用できる。 The main ash treatment product in the present invention thus obtained contains Ca (OH) 2 , silica, alumina and the like and can be suitably used as a raw material for producing cement. Moreover, it can be effectively used as a slag-forming agent in the case of producing slag such as a melting furnace.
以下、本発明の構成と効果を具体的に示す実施例等について説明する。なお、各種測定は次のようにして行った。 Examples and the like specifically showing the configuration and effects of the present invention will be described below. Various measurements were performed as follows.
（１）検出元素の含有比率
水洗前の飛灰と、水洗・固液分離後の水分付着ケーキを１１０℃で完全に乾燥させた乾燥処理物とをサンプルとして、次のようにして測定した。即ち、波長分散型蛍光Ｘ線装置（ＺＳＸ１００ｅ、理化学電機社製）を用いて、希ガスを除くＦ〜Ｕ元素を測定し、検出成分中の含有比率を算出する半定量分析を行った。
(1) Content ratio of detection element The fly ash before washing with water and the dried product obtained by completely drying the water-adhered cake after washing and solid-liquid separation at 110 ° C. were measured as follows. That is, the semi-quantitative analysis which measured the FU element except a rare gas using the wavelength dispersion type | mold fluorescence X-ray apparatus (ZSX100e, Riken Denki Co., Ltd.), and computed the content rate in a detection component was performed.
（２）水分付着ケーキの付着水分量
水分付着ケーキを乾燥機内で、約９０℃で十分乾燥させ、乾燥前後の重量の差を付着水分量として測定し、これを水分付着ケーキの乾燥前重量で割って、付着水分量の百分率（％）を求めた。
(2) Moisture adhering moisture content of the moisture adhering cake The moisture adhering cake is sufficiently dried at about 90 ° C. in the dryer, and the difference in weight before and after drying is measured as the adhering moisture amount. By dividing, the percentage (%) of the amount of adhering water was obtained.
（３）処理物の付着水分量
上記（２）と同様にして、処理物を乾燥機内で十分乾燥させ、乾燥前後の重量の差を付着水分量として測定し、これを処理物の乾燥前重量で割って、付着水分量の百分率（％）を求めた。
(3) Moisture content of treated product In the same manner as in (2) above, the treated product was sufficiently dried in a dryer, and the difference in weight before and after drying was measured as the amount of adhered moisture. The percentage (%) of the amount of adhering water was determined by dividing by.
実施例１
処理対象物として、ストーカ炉のバグフィルタで回収された、表１に示す検出元素の含有比率を有する飛灰１００ｇを準備した。この飛灰には、表１の元素含有比率とその他の分析結果（ＴＧ−ＤＴＡによる分析）から、Ｃａ（ＯＨ）２、ＣａＳＯ４、ＣａＣｌ２（例えば重量比５７、１６、２７）などを主として含有していることが分かる。
Example 1
As processing objects, 100 g of fly ash having a detection element content ratio shown in Table 1 collected by a bag filter of a stoker furnace was prepared. The fly ash mainly contains Ca (OH) 2 , CaSO 4 , CaCl 2 (for example, weight ratios 57, 16, and 27) based on the element content ratio in Table 1 and other analysis results (analysis by TG-DTA). It turns out that it contains.
この飛灰１００ｇに対し、水１Ｌを加えて、水洗タンク内で撹拌翼により１０分間撹拌して、水洗を行った。これをフィルタで濾過した後、再度、水１Ｌを加えて、水洗タンク内で撹拌翼により１０分間撹拌して、水洗した処理物をフィルタで濾過して、更に加圧脱水することによって、付着水分量が３２．７重量％の水分付着ケーキを得た。 1 L of water was added to 100 g of this fly ash, and the mixture was stirred for 10 minutes with a stirring blade in a water washing tank, and washed with water. After filtering this with a filter, 1 L of water is added again, and the mixture is stirred for 10 minutes with a stirring blade in a washing tank, and the washed product is filtered with a filter and further dehydrated under pressure, thereby adhering moisture. A moisture adhering cake having an amount of 32.7% by weight was obtained.
この水分付着ケーキに含まれる元素の含有比率を表１に示す。また、水洗前後の含有比率の差を表に併せて示すとともに、表１の結果を図１のグラフに示した。この結果から、水洗・固液分離によって、飛灰中の水溶性成分（例えば、ＣａＣｌ２、ＮａＣｌ等）を水洗・除去して、有用なカルシウム成分（例えば、水不溶性であるＣａ（ＯＨ）２、ＣａＳＯ４等）を効率良く回収していることが分かる。 Table 1 shows the content ratio of elements contained in the moisture-adhering cake. Moreover, while showing the difference of the content ratio before and behind water washing | cleaning together to the table | surface, the result of Table 1 was shown on the graph of FIG. From this result, water-soluble components (for example, CaCl 2 , NaCl, etc.) in the fly ash are washed and removed by water washing and solid-liquid separation, and useful calcium components (for example, Ca (OH) 2 that is water-insoluble). It can be seen that CaSO 4 and the like are efficiently recovered.
上記と同様にして得られた水分付着ケーキ１０００ｇ（付着水分重量３２７ｇ）を発泡スチロールにより保温したビーカ内に入れて、市販の生石灰（ＣａＯ純度９８％）７００ｇを添加して（ＣａＯは付着水分重量の２．１倍）、撹拌棒で混合撹拌を開始した。約２分後に撹拌を停止したが、反応による昇温が起こり、処理物は最高温度で１００℃以上となった。やがて、温度が低下して反応が終了したことが確認できた。最終的に得られた処理物は１５５０ｇとなり、水分１５０ｇが蒸発しており、付着水分量は０．０重量％であった。 1000 g of moisture-attached cake (attached moisture weight 327 g) obtained in the same manner as described above was placed in a beaker kept warm with foamed polystyrene, and 700 g of commercially available quicklime (CaO purity 98%) was added (CaO is the amount of attached moisture weight). 2.1 times), mixing stirring was started with a stirring rod. Stirring was stopped after about 2 minutes, but the temperature rose due to the reaction, and the treated product reached a maximum temperature of 100 ° C. or higher. Eventually, it was confirmed that the temperature was lowered and the reaction was completed. The final processed product was 1550 g, 150 g of water had evaporated, and the amount of adhering water was 0.0% by weight.
実施例２
実施例１において、市販の生石灰（ＣａＯ純度９８％）６００ｇ（ＣａＯは付着水分重量の１．８倍）を添加すること以外は、実施例１と全く同じ条件で、飛灰の処理を行った。最終的に得られた処理物は１４５０ｇとなり、水分１５０ｇが蒸発しており、付着水分量は０．５重量％であった。
Example 2
In Example 1, fly ash was treated under exactly the same conditions as Example 1 except that 600 g of commercially available quicklime (CaO purity 98%) (CaO is 1.8 times the weight of adhering water) was added. . The final processed product was 1450 g, 150 g of water had evaporated, and the amount of adhering water was 0.5% by weight.
実施例３
実施例１において、固液分離の条件を変えることによって、付着水分量が４５．７重量％の水分付着ケーキを得た。このようにして得られた水分付着ケーキ１０００ｇ（付着水分重量４５７ｇ）を発泡スチロールにより保温したビーカ内に入れて、市販の生石灰（ＣａＯ純度９８％）７５０ｇを添加して（ＣａＯは付着水分重量の１．６倍）、撹拌棒で混合撹拌を開始した。約２分後に撹拌を停止したが、反応による昇温が起こり、処理物は最高温度で１００℃以上となった。やがて、温度が低下して反応が終了したことが確認できた。最終的に得られた処理物は１４７０ｇとなり、水分２８０ｇが蒸発しており、付着水分量は１．２重量％であった。
Example 3
In Example 1, by changing the solid-liquid separation conditions, a moisture-adhered cake having a moisture content of 45.7% by weight was obtained. 1000 g of the moisture-attached cake thus obtained (attached moisture weight 457 g) was placed in a beaker kept warm with expanded polystyrene, and 750 g of commercially available quicklime (CaO purity 98%) was added (CaO is 1 of the attached moisture weight). 6 times), mixing stirring was started with a stirring rod. Stirring was stopped after about 2 minutes, but the temperature rose due to the reaction, and the treated product reached a maximum temperature of 100 ° C. or higher. Eventually, it was confirmed that the temperature was lowered and the reaction was completed. The finally obtained processed product was 1470 g, 280 g of water was evaporated, and the amount of attached water was 1.2% by weight.
実施例４
実施例１において、固液分離の条件を変えることによって、付着水分量が３７．２重量％の水分付着ケーキを得た。このようにして得られた水分付着ケーキ１０００ｇ（付着水分重量３７２ｇ）を発泡スチロールにより保温したビーカ内に入れて、市販の生石灰（ＣａＯ純度９８％）６００ｇを添加して（ＣａＯは付着水分重量の１．６倍）、撹拌棒で混合撹拌を開始した。約２分後に撹拌を停止したが、反応による昇温が起こり、処理物は最高温度で１００℃以上となった。やがて、温度が低下して反応が終了したことが確認できた。最終的に得られた処理物は１４００ｇとなり、水分２００ｇが蒸発しており、付着水分量は７．５重量％であった。
Example 4
In Example 1, by changing the solid-liquid separation conditions, a moisture-adhered cake having a moisture content of 37.2% by weight was obtained. 1000 g of the moisture-attached cake thus obtained (attached moisture weight 372 g) was placed in a beaker kept warm with expanded polystyrene, and 600 g of commercially available quicklime (CaO purity 98%) was added (CaO is 1 of the attached moisture weight). 6 times), mixing stirring was started with a stirring rod. Stirring was stopped after about 2 minutes, but the temperature rose due to the reaction, and the treated product reached a maximum temperature of 100 ° C. or higher. Eventually, it was confirmed that the temperature was lowered and the reaction was completed. The processed product finally obtained was 1400 g, 200 g of water was evaporated, and the amount of adhering water was 7.5% by weight.
実施例５
実施例１において、水分付着ケーキを得る際に、次のようにしてキレート剤と高分子凝集剤とを添加したこと以外は、全て実施例１と同じ条件で、水洗・固液分離と酸化カルシウムの添加とを実施した。その結果、処理物の最高温度は１００℃以上となり、最終的に得られた処理物の付着水分量は０重量％であった。
Example 5
In Example 1, the water-washing / solid-liquid separation and calcium oxide were all performed under the same conditions as in Example 1 except that the chelating agent and the polymer flocculant were added as follows when obtaining the moisture-adhering cake. Was added. As a result, the maximum temperature of the treated product was 100 ° C. or higher, and the amount of moisture adhered to the finally obtained treated product was 0% by weight.
水分付着ケーキは、まず実施例１と同じ飛灰１００ｇに対し、水１Ｌを加えて、水洗タンク内で撹拌翼により１０分間撹拌した後、更に、キレート剤（東ソー社製、ＴＸ−１０）５０ｍｇ／Ｌを添加して撹拌した後、高分子凝集剤（オルガノ社製）３ｍｇ／Ｌを添加して、凝集沈殿処理を行った。沈殿を確認した後、上澄液を除去した後、処理物をフィルタで濾過して、更に加圧脱水することによって、付着水分量が４０重量％の水分付着ケーキを得た。なお、除去した上澄液をサンプルとして、元素分析を行ったところ、重金属（亜鉛、鉛）は、検出されなかった。 First, after adding 1 L of water to 100 g of fly ash as in Example 1 and stirring with a stirring blade in a washing tank for 10 minutes, a chelating agent (manufactured by Tosoh Corporation, TX-10) 50 mg After / L was added and stirred, a polymer flocculant (manufactured by Organo) 3 mg / L was added to perform a coagulation precipitation treatment. After confirming the precipitation, the supernatant was removed, and the treated product was filtered through a filter and further dehydrated under pressure to obtain a moisture-attached cake having a moisture content of 40% by weight. In addition, when elemental analysis was performed using the removed supernatant as a sample, heavy metals (zinc and lead) were not detected.
比較例１
実施例１と同じ条件で得られた水分付着ケーキ１０００ｇを乾燥機で乾燥させて、付着水分量０重量％の処理物を得た。この処理物は、表１の水洗後の元素含有比率を有しているため、実施例１〜２と比べて、カルシウム成分が相対的に低いので、その用途が限定される。しかも、乾燥にかかる電力コストが大きくコスト的に不利なため、リサイクル利用が困難であると考えられる。
Comparative Example 1
1000 g of the moisture-attached cake obtained under the same conditions as in Example 1 was dried with a drier to obtain a treated product having an attached moisture amount of 0% by weight. Since this processed material has the element content ratio after water washing shown in Table 1, the calcium component is relatively low as compared with Examples 1 and 2, and therefore, its use is limited. Moreover, since the power cost for drying is large and disadvantageous in terms of cost, it is considered that recycling is difficult.
即ち、本発明の焼却残渣処理方法は、飛灰の水洗、重金属の凝集沈殿処理および固液分離を含む処理により水分付着ケーキを得る第1工程と、その水分付着ケーキに酸化カルシウムを添加して水酸化カルシウムを生成させる第2工程とを含むことを特徴とする。ここで、水分付着ケーキとは付着水分を含有するケーキをさし、脱水工程を経た脱水ケーキなども含まれる。 That is, the incineration residue treatment method of the present invention includes a first step of obtaining a moisture-attached cake by a treatment including fly ash washing , heavy metal coagulation precipitation treatment and solid-liquid separation, and adding calcium oxide to the moisture-attached cake. And a second step of generating calcium hydroxide. Here, the moisture-attached cake refers to a cake containing attached moisture, and includes a dehydrated cake that has undergone a dehydration step.
本発明の焼却残渣処理方法によると、第1工程によって、飛灰等に含まれる水溶性成分（例えば、金属精錬用途に有害なＣａＣｌ２等）を水洗・除去して、有用なカルシウム成分（例えば、Ｃａ（ＯＨ）２、ＣａＳＯ４等）を効率良く、水分付着ケーキとして回収することができる。更に、第２工程において、水分付着ケーキに酸化カルシウムを添加することで、水との反応により水分が除去され、その際に生じる反応熱によって水分の蒸発（気化）が生じるため、特に乾燥工程を行わなくても、水分を十分に除去することが可能になる。更に、酸化カルシウムを添加し、これが全部又は一部だけ水酸化カルシウムになるため、不要成分を増加させずに、必要なカルシウム成分を回収することができる。また、飛灰を処理する場合、重金属の凝集沈殿処理を行うことによって、水洗の廃液中から重金属を除去することができ廃液処理が軽減でき、また、飛灰処理物に重金属が含有されていても、特定の金属精錬工程や焼却設備などに対しては、重金属の含有が問題となる場合は少ない。 According to the incineration residue treatment method of the present invention, in the first step, water-soluble components contained in fly ash and the like (for example, CaCl 2 harmful to metal refining applications) are washed and removed, and useful calcium components (for example, , Ca (OH) 2 , CaSO 4, etc.) can be efficiently recovered as a moisture adhesion cake. Furthermore, in the second step, by adding calcium oxide to the moisture-adhering cake, moisture is removed by reaction with water, and moisture evaporation (vaporization) occurs due to reaction heat generated at that time. Even if it is not performed, it becomes possible to sufficiently remove moisture. Furthermore, since calcium oxide is added and becomes all or part of calcium hydroxide, the necessary calcium component can be recovered without increasing unnecessary components. Also, when treating fly ash, heavy metal can be removed from the waste liquid of washing by performing agglomeration and precipitation treatment of heavy metal, and waste liquid treatment can be reduced, and the fly ash treated product contains heavy metal. However, for a specific metal refining process or incineration facility, the inclusion of heavy metals is rare.
一方、本発明の焼却残渣処理物は、上記いずれかに記載の本発明の焼却残渣処理方法によって得られる焼却残渣処理物である。本発明の焼却残渣処理物によると、上記の如き作用効果によって、不要成分を増加させずに必要なカルシウム成分が十分回収されており、含水量が小さいため、搬送重量が小さく取扱い性にも優れたものとなる。また、製造コスト的にも有利な焼却残渣処理物となる。また、飛灰を処理する場合、重金属の凝集沈殿処理を行うことによって、水洗の廃液中から重金属を除去することができ廃液処理が軽減でき、また、飛灰処理物に重金属が含有されていても、特定の金属精錬工程や焼却設備などに対しては、重金属の含有が問題となる場合は少ない。 On the other hand, the incineration residue processed product of the present invention is an incineration residue processed product obtained by the incineration residue processing method of the present invention described above. According to the incineration residue-treated product of the present invention, the necessary calcium components are sufficiently recovered without increasing unnecessary components due to the above-described effects, and since the water content is small, the transport weight is small and the handleability is excellent. It will be. In addition, the incineration residue treatment product is advantageous in terms of manufacturing cost. Also, when treating fly ash, heavy metal can be removed from the waste liquid of washing by performing agglomeration and precipitation treatment of heavy metal, and waste liquid treatment can be reduced, and the fly ash treated product contains heavy metal. However, for a specific metal refining process or incineration facility, the inclusion of heavy metals is rare.
即ち、本発明の焼却残渣処理方法は、飛灰の水洗、その水洗で溶出した重金属の薬剤による凝集沈殿処理および凝集沈殿処理後のスラリーの固液分離を含む処理により、重金属を含む沈殿物及び水酸化カルシウムを含有する水分付着ケーキを得る第1工程と、その水分付着ケーキに酸化カルシウムを添加して水酸化カルシウムを生成させ、得られた焼却残渣処理物をリサイクル用のカルシウム成分として回収する第2工程と、を含むことを特徴とする。ここで、水分付着ケーキとは付着水分を含有するケーキをさし、脱水工程を経た脱水ケーキなども含まれる。 In other words, the incineration residue treatment method of the present invention comprises heavy metal precipitates obtained by washing with fly ash, coagulation precipitation treatment with heavy metal chemicals eluted by the water washing and solid-liquid separation of the slurry after the aggregation precipitation treatment , and First step of obtaining a moisture-adhering cake containing calcium hydroxide , adding calcium oxide to the moisture-adhering cake to generate calcium hydroxide , and recovering the resulting incineration residue treatment product as a calcium component for recycling And a second step. Here, the moisture-attached cake refers to a cake containing attached moisture, and includes a dehydrated cake that has undergone a dehydration step.
本発明の焼却残渣処理方法によると、第1工程によって、飛灰等に含まれる水溶性成分（例えば、金属精錬用途に有害なＣａＣｌ２等）を水洗・除去して、有用なカルシウム成分（例えば、Ｃａ（ＯＨ）２、ＣａＳＯ４等）を効率良く、水分付着ケーキとして回収することができる。更に、第２工程において、水分付着ケーキに酸化カルシウムを添加することで、水との反応により水分が除去され、その際に生じる反応熱によって水分の蒸発（気化）が生じるため、特に乾燥工程を行わなくても、水分を十分に除去することが可能になる。更に、酸化カルシウムを添加し、これが全部又は一部だけ水酸化カルシウムになるため、不要成分を増加させずに、必要なカルシウム成分をリサイクル用のカルシウム成分として回収することができる。また、飛灰を処理する場合、重金属の凝集沈殿処理を行うことによって、水洗で溶出した重金属を回収できるため水洗後の廃液処理が軽減でき、また、飛灰処理物（即ち、リサイクル用の回収物）に重金属が含有されていても、特定の金属精錬工程や焼却設備などに対しては、重金属の含有が問題となる場合は少ない。 According to the incineration residue treatment method of the present invention, in the first step, water-soluble components contained in fly ash and the like (for example, CaCl 2 harmful to metal refining applications) are washed and removed, and useful calcium components (for example, , Ca (OH) 2 , CaSO 4, etc.) can be efficiently recovered as a moisture adhesion cake. Furthermore, in the second step, by adding calcium oxide to the moisture-adhering cake, moisture is removed by reaction with water, and moisture evaporation (vaporization) occurs due to reaction heat generated at that time. Even if it is not performed, it becomes possible to sufficiently remove moisture. Furthermore, since calcium oxide is added and becomes calcium hydroxide only in whole or in part, the necessary calcium component can be recovered as a calcium component for recycling without increasing unnecessary components. Also, when processing fly ash, by performing coagulation precipitation treatment of heavy metals, the waste liquid treatment after washing because it can collect the eluted heavy metals can be reduced by washing with water, also fly ash treated (i.e., recovered for recycling Even if heavy metals are contained in the product, there are few cases where the inclusion of heavy metals becomes a problem for specific metal refining processes and incineration facilities.
一方、本発明のリサイクル方法は、本発明の焼却残渣処理方法により焼却残渣処理物を回収した後、この焼却残渣処理物をカルシウム成分として利用するものである。 On the other hand, the recycling method of the present invention uses the incineration residue treatment product as a calcium component after the incineration residue treatment product is recovered by the incineration residue treatment method of the present invention.
即ち、本発明の焼却残渣処理方法は、焼却設備の飛灰の水洗、その水洗で溶出した重金属のキレート剤添加による凝集沈殿処理および凝集沈殿処理後のスラリーの固液分離を含む処理により、重金属を含む沈殿物及び水酸化カルシウムを含有する水分付着ケーキを得る第1工程と、その水分付着ケーキに酸化カルシウムを添加して水酸化カルシウムを生成させ、得られた焼却残渣処理物をリサイクル用のカルシウム成分として回収する第2工程と、を含むことを特徴とする。ここで、水分付着ケーキとは付着水分を含有するケーキをさし、脱水工程を経た脱水ケーキなども含まれる。 That is, the incineration residue treatment method of the present invention comprises heavy metal by treatment including washing of fly ash in the incineration facility, coagulation precipitation treatment by adding a chelating agent of heavy metal eluted by the water washing, and solid-liquid separation of the slurry after coagulation precipitation treatment. First step of obtaining a moisture-containing cake containing precipitates containing calcium and calcium hydroxide, and adding calcium oxide to the moisture-attached cake to produce calcium hydroxide, and recycling the incineration residue treatment product obtained for recycling And a second step of recovering as a calcium component. Here, the moisture-attached cake refers to a cake containing attached moisture, and includes a dehydrated cake that has undergone a dehydration step.
Claims (4)
その水分付着ケーキに酸化カルシウムを添加して水酸化カルシウムを生成させる第2工程とを含む焼却残渣処理方法。 A first step of obtaining a moisture-attached cake by a treatment including washing of incineration residue and solid-liquid separation;
A method for treating incineration residues comprising a second step of adding calcium oxide to the moisture-adhering cake to produce calcium hydroxide.
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| CN108126974A (en) * | 2018-02-05 | 2018-06-08 | 北京中科国润环保科技有限公司 | Filter residue drying system and method after a kind of incineration of refuse flyash or the elution dechlorination of kiln ash |
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