JP2006015290A - Fixing method for heavy metal in fly ash using no mixing nor kneading apparatus - Google Patents
Fixing method for heavy metal in fly ash using no mixing nor kneading apparatus Download PDFInfo
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Abstract
Description
本発明は廃棄物を焼却する際に発生する飛灰中の重金属の固定化処理方法に関する。 The present invention relates to a method for immobilizing heavy metals in fly ash generated when incinerating waste.
従来の飛灰中に含まれている重金属の固定化処理方法は廃棄物焼却施設に付属して設置されている集塵装置で捕集され、集塵装置から排出された後に、水および重金属処理薬剤を添加し、混合、混練装置により反応を完結する固定化処理方法が用いられている。
(特許文献1参照。)
The conventional method for immobilizing heavy metals contained in fly ash is collected by a dust collector installed at a waste incineration facility, discharged from the dust collector, and then treated with water and heavy metals. An immobilization method is used in which a chemical is added and the reaction is completed by a mixing and kneading apparatus.
(See
また、排ガス中に処理薬剤を噴霧する方法としては、ピペリジンジチオカルバミン酸ナトリウムの水溶液で水銀などと反応させる方法が開示されている。
(特許文献2参照。)
In addition, as a method of spraying the treatment chemical into the exhaust gas, a method of reacting with mercury or the like with an aqueous solution of piperidine dithiocarbamate is disclosed.
(See
その他、ケイソウ土、アルミナ、シリカ、および活性炭などのバグフィルター用助剤などに、ヨウ化亜鉛を担持させて、バグフィルター助剤と同様にバグフィルター表面上にプレコートした後に水銀他の重金属を吸着処理する方法が示されている。
(特許文献3参照。)
In addition, zinc iodide is supported on bag filter aids such as diatomaceous earth, alumina, silica, and activated carbon, and pre-coated on the surface of the bag filter in the same manner as the bag filter aid, and then adsorbs mercury and other heavy metals. The method of processing is shown.
(See Patent Document 3)
捕集装置で捕集された飛灰は混合、混練装置で水および処理薬剤を添加して、飛灰中に含まれる重金属を固定化処理する方法が多く用いられているが、混合、混練装置の設置の費用が高く、設置のためのスペースが必要であり、メンテナンス作業などの労力も必要になるなど課題がある。 The fly ash collected by the collection device is often mixed and mixed with a kneading device, and water and a treatment chemical are added to immobilize heavy metals contained in the fly ash. The installation cost is high, a space for installation is necessary, and labor such as maintenance work is also required.
また、焼却施設に付属する飛灰の集塵装置の前で処理薬剤を噴霧する方法として、ピペリジンジチオカルバミン酸ナトリウム水溶液他のジチオカルバミン酸塩の水溶液を噴霧する方法が開示されているが、処理薬剤が水溶液であるために噴霧薬剤の有害ガス発生など作業環境などの安全性に問題があり、水溶液を噴霧する装置を別途設置する必要がある。さらに水溶液を噴霧した煙道排ガス中に含まれる飛灰は電気集塵機には腐食や引火性などの点で適用できないなど、集塵装置も制限される。 In addition, as a method of spraying the treatment chemical in front of the fly ash dust collector attached to the incineration facility, a method of spraying an aqueous solution of piperidine dithiocarbamate aqueous solution or other dithiocarbamate is disclosed. Since it is an aqueous solution, there is a problem in safety such as the working environment such as generation of harmful gas of spray medicine, and a device for spraying the aqueous solution needs to be installed separately. Furthermore, the dust collector is also limited, for example, fly ash contained in flue gas sprayed with an aqueous solution cannot be applied to electric dust collectors in terms of corrosion and flammability.
その他、ケイソウ土、アルミナ、シリカおよび活性炭などのバグフィルター用ろ過補助剤に、ヨウ化亜鉛(ZnI2)を担持させ、活性化させた吸着剤を煙道中に噴霧する方法でHg等重金属類を吸着し、灰の処理量が低減でき、処理法方が簡略化できる方法が開示されているが、排ガス中に含まれている揮散性の高い水銀ガスは比表面積の大きい活性化されたろ過補助剤には物理的あるいは化学的に吸着されるが、その他の重金属、例えば鉛(Pb)やカドミウム(Cd)あるいはクロム(Cr)などは捕集装置の下部から排出される飛灰中に含まれ、排出する際の基準値を満足する事ができないために、セメント固化装置あるいは溶融処理装置などの固定化処理が必要となり、処理費用が膨大になるなどの課題がある。 In addition, Hg and other heavy metals such as Hg can be sprayed into the flue by supporting zinc iodide (ZnI 2 ) on filter aids for bag filters such as diatomaceous earth, alumina, silica and activated carbon. Although a method has been disclosed that can reduce the amount of ash that can be adsorbed and simplify the treatment method, the highly volatile mercury gas contained in the exhaust gas is an activated filtration aid with a large specific surface area. The agent is physically or chemically adsorbed, but other heavy metals such as lead (Pb), cadmium (Cd), and chromium (Cr) are contained in the fly ash discharged from the lower part of the collector. However, since the standard value for discharging cannot be satisfied, a fixing process such as a cement solidifying apparatus or a melting processing apparatus is necessary, and there is a problem that processing costs become enormous.
本発明は焼却施設に付属する集塵装置や排ガス処理のために噴霧される消石灰、高反応消石灰、活性炭、ドロマイトなどの薬剤や既設の装置など改良する事なく、また、混合、混練の装置を必要としない重金属処理薬剤および処理方法を提供する事を目的とする。 The present invention provides a dust collecting device attached to an incineration facility, a slaked lime sprayed for exhaust gas treatment, highly reactive slaked lime, activated carbon, dolomite and other chemicals and existing devices, and without mixing, mixing and kneading devices. It aims at providing the heavy metal processing chemical | medical agent and processing method which are not required.
本発明は上記課題を解決するために煙道中へ重金属固定化処理薬剤を注入して、飛灰中の重金属と十二分に化学反応する薬剤の選定を行った。煙道排ガス中には塩化水素ガスや硫黄酸化物などの酸性ガスやダイオキシンなどが含まれ、温度は100〜250℃程度が一般的で水分も5〜30%含まれている。 In order to solve the above-mentioned problems, the present invention injects a heavy metal immobilization treatment chemical into the flue and selects a chemical that sufficiently reacts with the heavy metal in the fly ash. The flue exhaust gas contains acid gas such as hydrogen chloride gas and sulfur oxide, dioxin, etc., and the temperature is generally about 100 to 250 ° C. and the water also contains 5 to 30%.
薬剤の選定には、酸性ガス除去用あるいはダイオキシン吸着用に注入される消石灰、高反応消石灰、ドロマイトあるいは活性炭に悪影響を及ぼさない薬剤である事が必要である。例えば、特開平05−208117号のようにジチオカルバミン酸のアンモニウムやカリウムの塩ではダイオキシン吸着用に注入される活性炭に吸着され、ダイオキシン吸着効果を阻害する事が予想され、特開平10−109016号のようにケイソウ土、アルミナ、シリカおよび活性炭にヨウ化亜鉛を担持させて活性化されたバグフィルター用ろ過補助剤では飛灰が従来と同じように排出され、重金属固定化薬剤および処理装置を用いて、処理する必要がある。 In selecting a chemical, it is necessary that the chemical does not adversely affect slaked lime, highly reactive slaked lime, dolomite, or activated carbon injected for removing acidic gas or adsorbing dioxin. For example, as disclosed in JP-A No. 05-208117, an ammonium or potassium salt of dithiocarbamate is expected to be adsorbed on activated carbon injected for dioxin adsorption and inhibit the dioxin adsorption effect. In the filter aid for bag filters activated by supporting zinc iodide on diatomaceous earth, alumina, silica and activated carbon, fly ash is discharged as before, using heavy metal immobilization chemicals and processing equipment Need to be processed.
本発明は上記課題を解決するために耐熱温度が高く、ガス処理用薬剤注入に影響のない、ニ水酸化アルミニウム重合物〔Al2SO4(OH)4・XH2O・2Al(OH)3〕nの無機化合物やジエチルジチオカルバミン酸の塩(カリウム、ナトリウム、アンモニウム、カルシウムなどのアルカリ塩)と亜鉛と鉄の硫化物、塩化物、炭酸化物、リン酸化物からなる化合物から選ばれた1種以上と化学反応により合成されたジエチルジチオカルバミン酸亜鉛・鉄の生成物やゴム工業で加硫促進剤、加硫剤として市販され、公知の製造法で合成可能なジエチルジチオカルバミン酸亜鉛(C2H5)2NCS2Znおよびジエチルジチオカルバミン酸鉄(C2H5)2NCS2Feの混合物あるいはピペラジンジチオカルバミン酸カリウム(CH2)4N2C2S4K2の有機キレート化合物の粉状薬剤の中から選ばれた少なくとも1種以上を含有する事を特徴とする重金属固定化処理薬剤である。
In order to solve the above-mentioned problems, the present invention has a high heat-resistant temperature and does not affect the injection of chemicals for gas treatment. Aluminum dihydroxide polymer [Al 2 SO 4 (OH) 4 · XH 2 O · 2Al (OH) 3 ] One kind selected from inorganic compounds of n and salts of diethyldithiocarbamic acid (alkali salts such as potassium, sodium, ammonium, calcium) and sulfides, chlorides, carbonates, and phosphorus oxides of zinc and iron Zinc diethyldithiocarbamate (C 2 H 5 ), which is a product of zinc diethyldithiocarbamate and iron synthesized by the above chemical reaction and is commercially available as a vulcanization accelerator and vulcanizing agent in the rubber industry and can be synthesized by a known production method. mixture or piperazine dithiocarbamates of) 2 NCS 2 Zn and
本発明の重金属固定化処理薬剤は耐熱温度(融点150℃以上)に優れているので煙道中に排ガス処理用薬剤などと同様に注入し、使用する。すなわち、排ガス処理薬剤の消石灰、高反応消石灰ドロマイト(酸性ガス吸着用)、ケイソウ土、パーライト(バグフィルター用ろ過助剤)、活性炭(ダイオキシン吸着用)などの中から選ばれた1種以上と事前混合して用いる事ができる事を特徴とする。 Since the heavy metal immobilization treatment chemical of the present invention is excellent in heat-resistant temperature (melting point 150 ° C. or higher), it is injected into the flue in the same manner as the exhaust gas treatment chemical. That is, one or more selected from slaked lime, highly reactive slaked lime dolomite (for acid gas adsorption), diatomaceous earth, perlite (filter aid for bag filter), activated carbon (for dioxin adsorption), etc. It can be used as a mixture.
また、本発明の重金属固定化処理薬剤を単独で煙道中に注入して使用する事もできる。さらに既設の飛灰の重金属固定化処理用として、水と共に混合、混練装置へ注入して用いる事もできる。 Further, the heavy metal immobilization treatment agent of the present invention can be used alone by being injected into the flue. Furthermore, it can be mixed with water and injected into a kneading apparatus for use in fixing heavy metals in existing fly ash.
上記重金属固定化処理薬剤は各種セメント、ポルトランドセメント、早強セメント、アルミナセメント早強セメント、炭酸水素ナトリウム、炭酸ナトリウム、炭酸カリウム、炭酸水素カリウム、炭酸カルシウム、炭酸水素カルシウム、セッコウ、硫酸第1鉄、チオ硫酸ナトリウムなどの中から選ばれた1種以上と混合して用いる事ができる事を特徴とする。 The above heavy metal fixation treatment chemicals are various cements, Portland cement, early strong cement, early cemented alumina cement, sodium bicarbonate, sodium carbonate, potassium carbonate, potassium bicarbonate, calcium carbonate, calcium bicarbonate, gypsum, ferrous sulfate It can be used as a mixture with one or more selected from sodium thiosulfate and the like.
選定された処理薬剤は耐熱性に優れている上に一般的に市販されている水溶性のジチオカルバミン酸塩、例えばジエチルジチオカルバミン酸カリウムやテトラ(ジチオカルボキシ)テトラエチレンペンタミンナトリウムあるいはピペラジンニウム−1,4−ピペラジンジカルボジチエートカリウムなどと較べて、飛灰重量比で極端に少ない添加量で飛灰中の重金属を固定化処理する事ができる。 The selected treatment agent is excellent in heat resistance and is a commercially available water-soluble dithiocarbamate, such as potassium diethyldithiocarbamate, tetra (dithiocarboxy) tetraethylenepentamine sodium or piperazinenium-1, Compared with potassium 4-piperazine dicarbodithiate and the like, the heavy metal in the fly ash can be fixed with an extremely small amount added by the fly ash weight ratio.
一般的に焼却施設に付属する集塵装置から排出される飛灰は混合,混練装置で上記の水溶性キレート薬剤と水を添加し、処理され、飛灰中の重金属を固定化処理されているが本発明で選定した処理薬剤および処理方法を用いる事により、混合、混練装置が不必要で水の添加も不必要となり、混合、混練装置の設置スペース、設置費用および関連する人材も全く不要となり、飛灰中の重金属固定化処理が飛躍的に合理化される。 In general, fly ash discharged from a dust collector attached to an incineration facility is processed by adding the above water-soluble chelating agent and water in a mixing and kneading device, and the heavy metal in the fly ash is fixed. However, the use of the treatment chemical and treatment method selected in the present invention eliminates the need for mixing and kneading equipment and the addition of water, and eliminates the need for mixing and kneading equipment installation space, installation costs and related personnel. The heavy metal immobilization process in fly ash is dramatically streamlined.
さらに処理薬剤の添加量も少なく、排ガス処理薬剤(消石灰、高反応消石灰、ドロマイト、活性炭)と混合して用いる事により、排出される飛灰量が極端に少なくなり、埋立て処分場への搬入量が少なくなり、埋立処分費の節減や処理場の延命化に寄与する。 In addition, the amount of processing chemicals added is small, and when used in combination with exhaust gas processing chemicals (slaked lime, highly reactive slaked lime, dolomite, activated carbon), the amount of fly ash discharged becomes extremely small, and it is carried into landfill sites The amount is reduced, which contributes to the reduction of landfill costs and the extension of the life of the treatment plant.
以上、実施例を挙げて本発明を具体的に説明するが、本発明はこれに限定されるものではない。本発明の処理薬剤および処理方法を説明するための試料は都市ごみ焼却炉(ストーカー式連続運転)に消石灰を吹き込み後、バグフィルター式集塵装置で集塵された灰を用いた。重金属固定化の処理効果は環境庁告示第13号の溶出試験方法により、検液を調整し、飛灰中の重金属含有項目の中から代表的な鉛(Pb)を分析し、陸上埋立処分基準値(0.3mg/l)を用いて評価を行った。 As mentioned above, although an Example is given and this invention is demonstrated concretely, this invention is not limited to this. As samples for explaining the treatment chemical and the treatment method of the present invention, ash collected with a bag filter type dust collector after blowing slaked lime into a municipal waste incinerator (stoker-type continuous operation) was used. The effect of immobilizing heavy metals is determined by the dissolution test method of the Environmental Agency Notification No. 13 and the test solution is adjusted, and typical lead (Pb) is analyzed from the heavy metal-containing items in the fly ash. Evaluation was performed using the value (0.3 mg / l).
本発明の焼却施設に付属している集塵装置から排出される飛灰の処理方法として、混合、混練装置を用いない実施例として、12時間稼動で15tの廃棄物が焼却処理できる施設の集塵装置から排出される飛灰で事前の処理薬剤添加試験を行い、排ガス処理用薬剤(活性炭と混合した高反応消石灰)に本発明で選定した処理薬剤を混合して、既設のサイロに入れ、定量を煙道中に吹き込んで集塵装置の下部より排出された飛灰中の鉛(Pb)の溶出試験により求められた溶出量により評価を行った。 As a method for treating fly ash discharged from the dust collector attached to the incineration facility of the present invention, as an embodiment not using a mixing and kneading device, a collection of facilities capable of incinerating 15 tons of waste for 12 hours of operation. A preliminary treatment chemical addition test is performed with the fly ash discharged from the dust device, the treatment chemical selected in the present invention is mixed with the exhaust gas treatment chemical (highly reactive slaked lime mixed with activated carbon), and the mixture is placed in an existing silo. A fixed amount was blown into the flue and evaluated by the amount of elution obtained by the elution test of lead (Pb) in the fly ash discharged from the lower part of the dust collector.
本発明の処理薬剤の添加効果
図1はストーカー式焼却設備の概要を示したもので、1からごみが投入されて、2で乾燥工程を経て、燃焼に至り、3は燃焼し切れない残渣物が落下し冷却される。4は排ガス中の未燃物を再燃焼させて、5で排ガスを急令し、ダイオキシン類を発生し難くしたり、バグフィルターのフィルター部分の耐熱温度以下まで温度を下げる。6は排ガス処理用薬剤用のサイロで(消石灰や活性炭)、7のバグフィルター式集塵装置の前に噴霧(注入)される。7のバグフィルター式集塵装置で捕集された飛灰や排ガス処理用薬剤が飛灰として、図2.詳細説明1の8飛灰貯留用サイロに排出され、9の重金属固定化用薬剤と11の水タンクから12の水注入ポンプから注入された水と共に10の混合、混練装置で固定化処理されて、13のトラックなどで埋立処分場へ搬出される。
Effect of Addition of Treatment Agent of the Present Invention FIG. 1 shows an outline of a stalker-type incineration facility. Garbage is introduced from 1 and a drying process is performed in 2 to lead to combustion, and 3 is a residue that cannot be burned completely. Falls and cools. 4 recombusts the unburned matter in the exhaust gas, and 5 prompts the exhaust gas to make it difficult to generate dioxins, or lowers the temperature to below the heat resistance temperature of the filter portion of the bag filter. 6 is a silo for chemicals for exhaust gas treatment (slaked lime or activated carbon), which is sprayed (injected) before the bag filter
本発明の処理薬剤の添加効果の確認は現在一般的に用いられている上記システムと同様の操作手順を実験室のビーカースケールで再現して、確認を行った。8の飛灰サイロから採取した飛灰を用いて、各種の処理薬剤を無害化処理が完結するまで添加し、水は飛灰重量に対して、40重量部添加して行った。 Confirmation of the effect of adding the treatment chemical of the present invention was performed by reproducing the same operation procedure as that of the above-mentioned system that is generally used at present on a beaker scale in a laboratory. Using the fly ash collected from No. 8 fly ash silo, various treatment chemicals were added until the detoxification treatment was completed, and 40 parts by weight of water was added to the fly ash weight.
*1 処理薬剤 P:形状(粉体)ピペラジンジチオカルバミン酸カリウム
*2 処理薬剤 H:形状(粉体)ジエチルジチオカルバミン酸鉄・亜鉛の合成生成物
*3 処理薬剤 M:形状(粉体)ニ水酸化アルミニウム化合物
〔比較例〕
*4 市販品処理薬剤 A:形状(液体)ジエチルジチオカルバミン酸カリウム
*5 市販品処理薬剤 B:形状(液体)テトラエチレンペンタミンナトリウム
*6 市販品処理薬剤 C:形状(液体)ピペラジンジチオカルバミン酸カリウム
飛灰試料(薬剤無添加):pH=12.5 Pb溶出量=204mg/l
検定方法:環境庁告示第13号法
陸上埋立処分基準値:Pb0.3mg/l以下
表1に見られるように本発明に使用する粉体状処理薬剤は市販されている液状の処理薬剤に較べて、Pb溶出量を埋立処分基準値(0.3mg/l)以下にするための薬剤の添加率が低い事が認められた。したがって、現状行われている混合、混練装置を用いての飛灰の重金属固定化用薬剤としての適用も排出する処理後の飛灰量も減量化して埋立処分場へ搬出できる事になり、経費節減も含めて合理的にできる事が明らかになった。
* 1 Treatment agent P: Shape (powder) potassium piperazine dithiocarbamate * 2 Treatment agent H: Shape (powder) Synthesis product of iron and zinc diethyldithiocarbamate * 3 Treatment agent M: Shape (powder) dihydroxide Aluminum compound (comparative example)
* 4 Commercial treatment agent A: Shape (liquid) potassium diethyldithiocarbamate * 5 Commercial treatment agent B: Shape (liquid) sodium tetraethylenepentamine * 6 Commercial treatment agent C: Shape (liquid) potassium piperazine dithiocarbamate Ash sample (no chemical added): pH = 12.5 Pb elution amount = 204 mg / l
Test method: Environmental Agency Notification No. 13 landfill disposal standard value: Pb 0.3 mg / l or less As shown in Table 1, the powdery treatment chemical used in the present invention is compared with the commercially available liquid treatment chemical Thus, it was confirmed that the rate of addition of the drug to make the Pb elution amount equal to or less than the landfill disposal standard value (0.3 mg / l) was low. Therefore, it is possible to reduce the amount of fly ash after processing and to apply it as a chemical for immobilizing fly ash using heavy mixing and kneading equipment currently used, and to transport it to a landfill site. It became clear that we can do rationally, including savings.
本発明の処理薬剤(ジエチルジチオカルバミン酸亜鉛・鉄の合成生成物)を排ガス処理薬剤(消石灰80%:活性炭20%)と混合して、排ガス処理薬剤と共に直接煙道中へ吹き込み、排ガス処理と飛灰中の重金属を同時に無害化処理して、バグフィルター集塵装置から排出される飛灰を混合、混練装置を用いないで処理する方法を行った。排ガス処理薬剤との混合比は消石灰76%:活性炭19%:飛灰処理薬剤5%を用いて、15kg/hで煙道中に吹き込んだ。排ガス量は11000Nm3/hでバグフィルター集塵装置前の排ガス温度は160〜175℃の条件下で行った。排出された飛灰は運転開始から1時間後に採取し、その後、1時間毎に採取して、Pb溶出量により評価を行った。 The treatment chemical of the present invention (zinc diethyldithiocarbamate / iron synthesis product) is mixed with the exhaust gas treatment chemical (80% slaked lime: 20% activated carbon) and directly blown into the flue together with the exhaust gas treatment chemical. The heavy metal contained therein was detoxified at the same time, and the fly ash discharged from the bag filter dust collector was mixed and treated without using a kneader. The mixture ratio with the exhaust gas treatment chemical was blown into the flue at 15 kg / h using 76% slaked lime: 19% activated carbon: 5% fly ash treatment chemical. The exhaust gas amount was 11000 Nm 3 / h, and the exhaust gas temperature before the bag filter dust collector was 160 to 175 ° C. The discharged fly ash was collected 1 hour after the start of operation, and then collected every hour, and evaluated based on the Pb elution amount.
表2に見られるように、焼却炉運転開始後から約4時間後にバグフィルター集塵装置内に残存する重金属固定化処理薬剤の含まれていない飛灰と重金属固定化処理薬剤の含まれた飛灰が置換された飛灰が排出され、4時間経過後の飛灰はPb溶出量が検出下限界以下(0.05mg/l)で混合、混練装置を用いないでも処理が行われた事が明らかになった。 As can be seen in Table 2, about 4 hours after the start of incinerator operation, fly ash that does not contain heavy metal immobilization treatment chemical remaining in the bag filter dust collector and heavy metal immobilization treatment chemical contained It is clear that fly ash substituted with ash was discharged, and the fly ash after 4 hours was mixed with Pb elution amount below the detection limit (0.05 mg / l) and processed without using a kneader. Became.
本発明の重金属固定化用処理薬剤は固化強度向上、サイロ内での分散性向上、物理吸着性能向上などの使用目的に応じて、各種材料と混合して用いる。実施試験はストーカ式焼却炉のバグフィルター集塵装置から排出された飛灰を用いて、各種材料を飛灰重量に対して10%および20%添加し、水40%を添加して処理した後に規定の溶出試験方法にて、Pb溶出量を求めた。各種材料のPb溶出量の抑制効果および使用目的例を次の表3に示す。 The treatment agent for immobilizing heavy metals of the present invention is used by mixing with various materials according to the purpose of use such as improvement of solidification strength, improvement of dispersibility in silos, and improvement of physical adsorption performance. The test was conducted using fly ash discharged from a bag filter dust collector of a stoker-type incinerator, adding 10% and 20% of various materials to the fly ash weight, and adding 40% water. The amount of Pb elution was determined by the specified dissolution test method. Table 3 below shows the effect of suppressing the amount of Pb eluted from various materials and examples of the purpose of use.
検定方法:環境庁告示第13号法
Examination method: Environmental Agency Notification No.13
本発明の飛灰用の重金属固定化処理薬剤は混合、混練装置を用いない処理方法あるいは混合、混練装置を用いて処理する場合においても表3の各種材料を使用目的に応じて混合して用いる事により、さらに用途が広がる。分散性向上はストックサイロでのブリッジング防止目的で使用される事が多く、一般的には添加比率も0.5〜5%の範囲内である。物理吸着性能向上は、水銀(Hg)やダイオキシン(DXN)あるいはPCBなどを吸着固定化する事に用いる。添加比率も対象物質の含有量や溶出量に起因し、変動する。強度向上は重金属固定化処理後に埋立処分場へ搬出する際の飛散防止のために行われる事が多く、一般的には安価なポリトランドセメントが多く使用されている。 The heavy metal immobilization treatment chemical for fly ash of the present invention is used by mixing various materials shown in Table 3 according to the purpose of use even in the case of processing using a mixing and kneading apparatus or when using a mixing and kneading apparatus. Depending on the situation, the application will be further expanded. Improvement in dispersibility is often used for the purpose of preventing bridging in stock silos, and the addition ratio is generally in the range of 0.5 to 5%. The physical adsorption performance is improved by adsorbing and fixing mercury (Hg), dioxin (DXN) or PCB. The addition ratio also varies due to the content and elution amount of the target substance. Strength improvement is often performed to prevent scattering when transported to a landfill after heavy metal immobilization treatment, and generally inexpensive polyland cement is used.
1 ごみ投入ホッパー
2 ストーカー式焼却炉
3 焼却残渣物冷却水槽
4 二次燃焼室
5 ガス冷却室
6 排ガス処理用薬剤サイロ
6A 重金属固定化用薬剤混入排ガス処理用薬剤サイロ
7 バグフィルター式集塵装置
8 貯留サイロ
9 重金属固定化用薬剤サイロ
10 混合、混練装置
11 水タンク
12 水道水用ポンプ
13 飛灰搬出用トラック
14 誘因送風機
15 煙突
16 飛灰処理物バンカーピット
1
Claims (5)
The treatment agent according to claim 1 and claim 2 is mixed with at least one selected from various cements, solidification materials, gypsum, diatomaceous earth, perlite, activated carbon, metal powder, metal salt compound, reducing agent, oxidizing agent, and the like. It can also be used for the purpose of improving solidification strength, dispersibility, physical adsorption performance and the like.
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JP2007167818A (en) * | 2005-12-26 | 2007-07-05 | Ebara Engineering Service Co Ltd | Treating agent for exhaust gas and treating method of exhaust gas |
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