JP2013095605A - Incineration ash treatment method - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 99
- 238000005406 washing Methods 0.000 claims abstract description 68
- 239000002002 slurry Substances 0.000 claims abstract description 62
- 238000001914 filtration Methods 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 18
- 238000002360 preparation method Methods 0.000 claims abstract description 10
- 239000000446 fuel Substances 0.000 claims abstract description 9
- 238000003860 storage Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 37
- 239000000460 chlorine Substances 0.000 abstract description 37
- 229910052801 chlorine Inorganic materials 0.000 abstract description 37
- 238000000926 separation method Methods 0.000 abstract description 11
- 239000007788 liquid Substances 0.000 abstract description 8
- 239000007787 solid Substances 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 4
- 239000002956 ash Substances 0.000 description 65
- 230000007423 decrease Effects 0.000 description 8
- 239000010881 fly ash Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 239000002699 waste material Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000004056 waste incineration Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 150000002013 dioxins Chemical class 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229940043430 calcium compound Drugs 0.000 description 1
- 150000001674 calcium compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
本発明は、焼却灰の処理方法に関する。詳しくは、セメント製造の原燃料とする際に問題となる塩素量を低減できる焼却灰の処理方法、及びそのための装置に関する。 The present invention relates to a method for treating incinerated ash. More specifically, the present invention relates to a method for treating incinerated ash that can reduce the amount of chlorine, which is a problem when used as a raw material for cement production, and an apparatus therefor.
都市ゴミ等の焼却飛灰は、その発生量が多い、塩素含有量が多い、重金属を含む、ダイオキシンを含む、発生の場所によって成分が大きく変わるなどの特徴が有り、その利用方法は限られている。 Incineration fly ash such as municipal waste is characterized by a large amount of generation, high chlorine content, heavy metals, dioxins, and components that vary greatly depending on the location of generation. Yes.
その利用方法の一つに、セメントの原燃料とする方法がある。しかしながらセメント原燃料とする場合も無制限に使用できるわけではなく、特に、最終製品であるセメント中の塩素含有量をＪＩＳ規格に収めるために、焼却灰を洗浄し、その塩素含有量を減らす必要性がある（特許文献１〜３、非特許文献１等）。 One of the utilization methods is a method of using cement as a raw fuel. However, when used as a cement raw fuel, it can not be used without limitation. In particular, in order to keep the chlorine content in the cement, which is the final product, in JIS standards, it is necessary to clean the incineration ash and reduce its chlorine content. (Patent Documents 1 to 3, Non-Patent Document 1, etc.).
ところが、焼却灰スラリーのろ過後、多量の水を用いてろ過残渣の洗浄を行っても、得られた洗浄灰の塩素量が十分に低下していない場合があるという問題があった。 However, after filtering the incinerated ash slurry, there is a problem that even if the filtration residue is washed using a large amount of water, the chlorine content of the obtained washed ash may not be sufficiently reduced.
本発明者等は上記課題に鑑み、鋭意検討を行った。その結果、洗浄後の焼却灰中の塩素濃度は、ろ過後の洗浄水量を一定量以上にすると、その後はほとんど変化せず、むしろスラリー調製時のスラリー濃度（スラリー中の焼却灰の割合）によりその大部分が決せられることを見出し、本発明を完成するに至った。 In view of the above problems, the present inventors have conducted intensive studies. As a result, the chlorine concentration in the incinerated ash after washing hardly changes after the amount of washing water after filtration exceeds a certain level. Rather, it depends on the slurry concentration (ratio of incinerated ash in the slurry) at the time of slurry preparation. It has been found that most of them can be decided, and the present invention has been completed.
即ち、本発明は、スラリー貯槽中で焼却灰を水と混合してスラリーとする工程、該スラリーを洗浄灰と洗浄水とに分離する工程及びろ過残渣を水洗する工程を含んでなる、焼却灰をセメント原燃料とするための水洗処理方法において、
スラリー調製及び洗浄に使用できる合計水量をＹ質量部としたとき、
焼却灰１００質量部に対して、ろ過残渣を水洗する際に用いる水の量を５００〜２０００質量部とし、残部の水（Ｙ−５００〜Ｙ−２０００質量部）を全てスラリーを調製するために用いることを特徴とする焼却灰の水洗処理方法である。
That is, the present invention comprises a step of mixing incinerated ash with water in a slurry storage tank to form a slurry, a step of separating the slurry into washing ash and washing water, and a step of washing the filtration residue with water. In the water washing treatment method for making cement raw fuel,
When the total amount of water that can be used for slurry preparation and washing is Y parts by mass,
In order to prepare a slurry of all the remaining water (Y-500 to Y-2000 parts by mass) with respect to 100 parts by mass of incinerated ash, the amount of water used when washing the filtration residue with water is 500 to 2000 parts by mass. It is a water-washing method of incinerated ash characterized by using.
他の発明は、スラリー貯槽中で焼却灰を水と混合してスラリーとする工程、該スラリーを洗浄灰と洗浄水とに分離する工程及びろ過残渣を水洗する工程を含んでなる、焼却灰をセメント原燃料とするための水洗処理方法において、
焼却灰１００質量部に対して、ろ過残渣を水洗する際に用いる水の量を５００〜２０００質量部とし、かつ、前記スラリーの焼却灰濃度を１０質量％以下とする焼却灰の水洗処理方法である。
Another invention comprises a step of mixing incineration ash with water in a slurry storage tank to form a slurry, a step of separating the slurry into washing ash and washing water, and a step of washing the filtration residue with water. In the water washing method for making cement raw fuel,
A method for washing incinerated ash with 100 mass parts of incinerated ash, wherein the amount of water used when washing the filtration residue with water is 500 to 2000 parts by mass, and the incinerated ash concentration of the slurry is 10 mass% or less. is there.
上記焼却灰の水洗処理方法において、スラリーを洗浄灰と洗浄水とに分離する工程に用いる装置はフィルタープレスであることが望ましい。 In the incineration ash washing method, the apparatus used in the step of separating the slurry into washing ash and washing water is preferably a filter press.
本発明によれば、相対的に少量の水で、安定的に塩素含有量の少ない処理済み焼却灰を得ることができる。これにより、該焼却灰をセメント原燃料として使用しても、製造されるセメント中の塩素量を抑制することができ、よって、セメント原燃料として常に多量の焼却灰を使用することが容易となる。 According to the present invention, a treated incinerated ash having a low chlorine content can be stably obtained with a relatively small amount of water. As a result, even if the incinerated ash is used as a cement raw fuel, it is possible to suppress the amount of chlorine in the produced cement, and thus it becomes easy to always use a large amount of incinerated ash as the cement raw fuel. .
本発明において処理対象とされる焼却灰は特に限定されるものではないが、その発生量が多く、セメント原料以外の有用な用途が実質的に無く、かつ塩素含有量も比較的多い点で都市ゴミ焼却灰を対象とすることが好ましい。 The incinerated ash to be treated in the present invention is not particularly limited, but the amount of generated incineration ash is large, the city has no useful use other than the cement raw material, and the city has a relatively large chlorine content. It is preferable to target garbage incineration ash.
都市ゴミの焼却炉から排出される焼却灰のうち、主灰は、主としてストーカー炉の下部より燃え殻として排出される焼却灰であり、冷却焼却後に水と接触するため、水分を２０％ないし５０％（質量）程度含有する塊状物として得られる。また、その塩素含有量は、０．５ないし５．０％（質量）に及ぶ。一方、飛灰は、ストーカー炉の排ガスや流動床炉の排ガスより補足される微粉であり、一般に５ないし３０％（質量）程度の割合で塩素を含有している。 Of the incineration ash discharged from municipal waste incinerators, the main ash is mainly incinerated ash discharged from the lower part of the stalker furnace as burned husks, and because it comes into contact with water after cooling incineration, the water content is 20% to 50%. It is obtained as a lump containing about (mass). The chlorine content ranges from 0.5 to 5.0% (mass). On the other hand, fly ash is fine powder supplemented from exhaust gas from a stalker furnace or exhaust gas from a fluidized bed furnace, and generally contains chlorine at a ratio of about 5 to 30% (mass).
上記主灰には、空き缶、針金等の異物が多く含まれる場合があり、これらをあらかじめ除去することが好ましい。また、主灰は塊状物であるため、あらかじめ平均粒径が２００μｍ以下、好ましくは、１５０μｍ以下、さらに好ましくは、５０ないし１００μｍとなるように調整することが必要である。さらに、主灰粉砕後においても、未粉砕物や粉砕前に除去しきれていない異物を除去することが好ましい。 The main ash may contain a large amount of foreign matter such as empty cans and wires, and it is preferable to remove these in advance. Further, since the main ash is a lump, it is necessary to adjust in advance so that the average particle size is 200 μm or less, preferably 150 μm or less, and more preferably 50 to 100 μm. Furthermore, it is preferable to remove the unground product and foreign matter that has not been completely removed before pulverization even after the main ash pulverization.
一方、飛灰は主灰に対して多量のダイオキシン類を含有しているため、予め脱ダイオキシン類処理をされていることが好ましい。 On the other hand, since fly ash contains a large amount of dioxins with respect to main ash, it is preferable that the diash is treated in advance.
脱ダイオキシン類の方法は特に限定されず公知の条件にて行えばよいが、例えば、飛灰を無酸素雰囲気下、３００ないし４５０℃、好ましくは３５０℃ないし４５０℃の温度で処理すればよい。上記無酸素雰囲気下とは、酸素が完全に存在しない場合の他に、装置等の構造により不可避的に進入する酸素、被処理物に同伴される酸素等が含有されている態様を含むものである。脱ダイオキシン類は、無酸素雰囲気を窒素ガスによって形成し、加熱機により加熱を行う態様が好ましい。なお、脱ダイオキシン類処理における加熱により、水銀も揮発除去でき、比較的高濃度の水銀を含む都市ゴミ焼却灰の前処理としては有効である。 The method for dedioxins is not particularly limited, and may be performed under known conditions. For example, fly ash may be treated at a temperature of 300 to 450 ° C., preferably 350 to 450 ° C. in an oxygen-free atmosphere. The oxygen-free atmosphere includes not only the case where oxygen is not completely present, but also includes an aspect in which oxygen that inevitably enters due to the structure of an apparatus or the like, oxygen that accompanies the object to be processed, and the like are contained. As for dedioxins, the aspect which forms an oxygen-free atmosphere with nitrogen gas, and heats with a heater is preferable. Mercury can also be volatilized and removed by heating in the dedioxin treatment, which is effective as a pretreatment for municipal waste incineration ash containing a relatively high concentration of mercury.
本発明においては、上記の如くして前処理された主灰、飛灰等の焼却灰をそれぞれ、或いは同時に水と混合してスラリー化する。スラリー化の方法は特に限定されるものではなく、公知の方法を適宜選択して行えばよい。 In the present invention, incinerated ash such as main ash and fly ash pretreated as described above is mixed with water, respectively, or slurried. The method of slurrying is not particularly limited, and a known method may be selected as appropriate.
本発明においては上記の如き焼却灰を水と混合してスラリーとする。当該スラリー化の方法は特に限定されず、例えば、スラリー貯槽内に、焼却灰及び水を入れて攪拌する方法が挙げられる。 In the present invention, the incinerated ash as described above is mixed with water to form a slurry. The method of slurrying is not particularly limited, and examples thereof include a method in which incinerated ash and water are placed in a slurry storage tank and stirred.
本発明においては、上記の如くして前処理された主灰、飛灰等の焼却灰をそれぞれ、或いは同時に水と混合してスラリー化する。スラリー化の方法は特に限定されるものではなく、公知の方法を適宜選択して行えばよい。例えば、スラリー貯槽内に、焼却灰及び水を入れて攪拌する方法が挙げられる。 In the present invention, incinerated ash such as main ash and fly ash pretreated as described above is mixed with water, respectively, or slurried. The method of slurrying is not particularly limited, and a known method may be selected as appropriate. For example, the method of putting incineration ash and water in a slurry storage tank and stirring it can be mentioned.
スラリーとする際の水の水温は特に限定されるものではないが、１０℃以上が好ましく、１５℃以上がより好ましく、２０℃以上が最も好ましい。この際に用いる水としては、一般的な工水、地下水、水道水等を用いることができる。 The temperature of water when making the slurry is not particularly limited, but is preferably 10 ° C. or higher, more preferably 15 ° C. or higher, and most preferably 20 ° C. or higher. As the water used at this time, general industrial water, ground water, tap water and the like can be used.
攪拌を行う時間は、全体が均一なスラリーとなる程度であればよく、攪拌装置にもよるが、一般的には５〜６０分間程度で十分である。 The stirring time is sufficient if it becomes a uniform slurry as a whole, and depending on the stirring device, about 5 to 60 minutes is generally sufficient.
本発明における特徴は、使用可能な全水量から、必要最小限の洗浄水量を確保し、残部の水を全てスラリーを調製するために用い、可能な限りスラリー濃度を低くする点にある。これは前述のとおり洗浄後の焼却灰中の塩素濃度は、ろ過後の洗浄水量にはほとんど依存せず、スラリー調製時のスラリー濃度によりその大部分が決せられるためである。むろん無制限に水が使用できれば、洗浄水を多量に使用してよいが、通常は使用できる水量に制限がある。そこで、本発明においては限られた水を塩素低減効果を最大限に得るために、上述の通り水をスラリー調製水と、ろ過残洗浄水とに振り分けるものである。 The feature of the present invention is that the necessary minimum amount of washing water is secured from the total amount of water that can be used, and all the remaining water is used for preparing the slurry, and the slurry concentration is made as low as possible. This is because, as described above, the chlorine concentration in the incinerated ash after washing hardly depends on the amount of washing water after filtration, and is largely determined by the slurry concentration at the time of slurry preparation. Of course, if water can be used without limitation, a large amount of washing water may be used, but usually there is a limit to the amount of water that can be used. Therefore, in the present invention, in order to obtain the maximum chlorine reduction effect of the limited water, the water is divided into the slurry preparation water and the filtration residual washing water as described above.
具体的には図１に示すように、ろ過後のろ過残を洗浄するための洗浄水量としては焼却灰１００質量部に対して５００質量部以上では、ろ過残の塩素濃度の低減効果は頭打ちとなる傾向が強い。一方、図２に示すように焼却灰スラリーのスラリー濃度を薄くするほど、塩素濃度は低くなる傾向にある。 Specifically, as shown in FIG. 1, the amount of washing water for washing the filtered residue after filtration is 500 parts by mass or more with respect to 100 parts by mass of incinerated ash, and the effect of reducing the chlorine concentration of the filtered residue is peak. The tendency to become strong. On the other hand, as shown in FIG. 2, the chlorine concentration tends to decrease as the slurry concentration of the incineration ash slurry decreases.
従って、本発明においては該洗浄水量を焼却灰１００質量部に対して５００質量部以上、好ましくは５５０質量部以上、より好ましく６００質量部以上とする。一方、使用可能な全水量が限定された範囲内でできるだけスラリー調製用の水に回すため上限を２０００質量部、好ましくは１８００質量部、さらに好ましくは１５００質量部以下、特に好ましくは１０００質量部以下とする。 Therefore, in the present invention, the amount of the washing water is 500 parts by mass or more, preferably 550 parts by mass or more, more preferably 600 parts by mass or more with respect to 100 parts by mass of the incineration ash. On the other hand, the upper limit is 2000 parts by weight, preferably 1800 parts by weight, more preferably 1500 parts by weight or less, and particularly preferably 1000 parts by weight or less in order to turn the total amount of water that can be used into water for slurry preparation as much as possible. And
本発明を他の観点からみると、焼却灰スラリーのスラリー濃度を薄くするほど塩素濃度は低くなるという点に鑑み、該スラリー濃度を１０質量％以下、好ましくは７質量％以下とすることにより、焼却灰１００質量部に対して５００〜２０００質量部程度の少量の洗浄水で十分に塩素濃度を低減できるものである。 From another point of view of the present invention, in view of the fact that the chlorine concentration decreases as the slurry concentration of the incineration ash slurry decreases, the slurry concentration is 10% by mass or less, preferably 7% by mass or less, The chlorine concentration can be sufficiently reduced with a small amount of washing water of about 500 to 2000 parts by mass with respect to 100 parts by mass of incinerated ash.
上述の如くしてスラリー化され、洗浄されることにより、焼却灰中の塩素分の大部分は水中に溶解する。本発明においてはスラリーを洗浄灰と洗浄水とに分離することにより、洗浄灰の塩素量を大幅に低減できる。 By slurrying and washing as described above, most of the chlorine content in the incinerated ash is dissolved in water. In the present invention, the amount of chlorine in the washing ash can be greatly reduced by separating the slurry into washing ash and washing water.
当該分離方法は固液分離の可能な公知の方法を特に限定することなく採用できるが、分離効率、及び分離後の固形分の洗浄が容易な点でフィルタープレスが好ましい。 Although the said separation method can employ | adopt without specifically limiting the well-known method in which solid-liquid separation is possible, a filter press is preferable at the point which is easy to wash | clean separation efficiency and solid content after isolation | separation.
むろんフィルタープレス以外にも、ヌッチェ式吸引ろ過機、ドラムフィルター、ベルトフィルター等、公知ものものが際限なく利用できる。 Of course, besides the filter press, known things such as Nutsche suction filter, drum filter and belt filter can be used without limitation.
上記フィルタープレス等により水と固形分（ろ過残渣）とに分離した後、分離仕切れなかったろ過残渣に含まれる塩素分（多くはろ別しきれなかった洗浄水中に含まれる）を除去するため、固形分をさらに水洗するが、この際の水量を前記した範囲の量とすることにより総使用水量の削減が可能となる。なおこの洗浄工程における水温は、特に限定されるものではないが、１０℃以上が好ましく、１５℃以上がより好ましく、２０℃以上が最も好ましい。 After separating into water and solids (filter residue) by the above filter press etc., solids are removed to remove chlorine contained in the filter residue that was not separated and separated (mostly contained in the wash water that could not be filtered off). The water is further washed with water, and the total amount of water used can be reduced by setting the amount of water in this range to the above-mentioned range. The water temperature in this washing step is not particularly limited, but is preferably 10 ° C or higher, more preferably 15 ° C or higher, and most preferably 20 ° C or higher.
洗浄方法は、用いた固液分離装置に応じて公知の方法を採用すればよい。例えばフィルタープレスを用いた場合には、脱水ケーキをフィルターで挟んだまま貫通洗浄を行う方法などが挙げられる。 As a cleaning method, a known method may be employed depending on the solid-liquid separation device used. For example, when a filter press is used, a method of performing through-cleaning with a dehydrated cake sandwiched between filters can be used.
上記の如き本発明は、使用可能な水量が限られている際に特に有効であり、スラリー調製及び洗浄に使用できる合計水量が焼却灰１００質量部に対して５０００質量部以下、特に３０００質量部以下の際にその有効性が高い。 The present invention as described above is particularly effective when the amount of water that can be used is limited, and the total amount of water that can be used for slurry preparation and washing is 5000 parts by mass or less, particularly 3000 parts by mass with respect to 100 parts by mass of incinerated ash. Its effectiveness is high in the following cases.
本発明において、上記洗浄工程で得られた固形分（洗浄灰）は、カルシウム化合物、シリカを主成分とし、かつ塩素分が大幅に低減されているため、セメント製造工場にてセメント原料として使用される。この場合、上記固形分は水分を含有しているため、原料調製行程でセメント原料とともにドライヤーを経てサスペンションプレヒーターに供給することが好ましい。また、本発明で得られる排水は、公知の排水処理を行い処理排水として排出すればよい。 In the present invention, the solid content (washed ash) obtained in the above washing step is mainly used as a cement raw material in a cement manufacturing plant because it contains a calcium compound and silica as main components and the chlorine content is greatly reduced. The In this case, since the solid content contains water, it is preferably supplied to the suspension preheater through the dryer together with the cement raw material in the raw material preparation process. Moreover, what is necessary is just to discharge | emit the waste_water | drain obtained by this invention as a treated waste water after performing a known waste water treatment.
以下、実験例により本発明をより具体的に説明するが、本発明はこれらの実施例に限定されるものではない。 Hereinafter, the present invention will be described in more detail with reference to experimental examples, but the present invention is not limited to these examples.
各実験例における焼却灰中の塩素濃度の測定は、試料の焼却灰を１００℃で乾燥後、蛍光Ｘ線分析によって測定した。 The chlorine concentration in the incinerated ash in each experimental example was measured by fluorescent X-ray analysis after drying the incinerated ash of the sample at 100 ° C.
実験例１〜８
スラリー貯層中で、都市ゴミ焼却炉より得られたゴミ焼却灰１００質量部に対して水１４００質量部（水温２５℃）を加えてスラリー濃度６．７質量％の焼却灰スラリーを得た。このスラリーをフィルタープレスに導入し固液分離を行った。さらにろ過残ケーキ（固形分）を、前記ゴミ焼却灰１００質量部に対して０〜１４０００質量部相当の水量で貫通洗浄した。洗浄後の洗浄ケーキの塩素量を測定した結果を、洗浄に際して用いた水量等と共に表１に示す。
Experimental Examples 1-8
In the slurry reservoir, 1400 parts by mass of water (
実験例９〜１６
スラリー貯層中で、都市ゴミ焼却炉より得られたゴミ焼却灰１００質量部に対して水９００質量部（水温１８℃）を加えてスラリー濃度１０質量％の焼却灰スラリーを得た。このスラリーをフィルタープレスに導入し固液分離を行った。さらにろ過残ケーキ（固形分）を、前記ゴミ焼却灰１００質量部に対して０〜４０００質量部相当の水量で貫通洗浄した。洗浄後の洗浄ケーキの塩素量を測定した結果を、洗浄に際して用いた水量等と共に表２に示す。
Experimental Examples 9-16
In the slurry reservoir, 900 parts by mass of water (water temperature 18 ° C.) was added to 100 parts by mass of garbage incineration ash obtained from a municipal waste incinerator to obtain an incineration ash slurry having a slurry concentration of 10% by mass. This slurry was introduced into a filter press for solid-liquid separation. Further, the filtration residue cake (solid content) was subjected to through washing with a water amount corresponding to 0 to 4000 parts by mass with respect to 100 parts by mass of the dust incineration ash. The results of measuring the chlorine content of the washed cake are shown in Table 2 together with the amount of water used for washing.
実験例１から１６の結果を、横軸を洗浄に用いた水量（対焼却灰１００質量部）、縦軸を洗浄後の洗浄ケーキの塩素量としてプロットした結果を図１として示す。 The results of Experimental Examples 1 to 16 are plotted in FIG. 1 as a result of plotting the amount of water used for cleaning (100 parts by mass of incinerated ash) on the horizontal axis and the amount of chlorine in the washed cake after cleaning on the vertical axis.
この図１及び表１、２から読み取れるように、焼却灰１００質量部に対して洗浄水が５００質量部までは洗浄ケーキの塩素量は低下していくが、洗浄水量をそれ以上増加させても塩素量の低下はない。 As can be seen from FIG. 1 and Tables 1 and 2, the amount of chlorine in the washing cake decreases until the washing water reaches 500 parts by mass with respect to 100 parts by mass of the incinerated ash, but even if the amount of washing water is increased further. There is no decrease in chlorine content.
実験例１７〜２０
スラリー濃度を変化させてスラリーを調製し、各々フィルタープレスで固液分離を行った後、焼却灰１００質量部に対して５００質量部以上の洗浄水で洗浄を行った。洗浄後の洗浄ケーキの塩素量を測定した結果を、スラリー濃度等と共に表３及び図２に示す。この図表に示されているように、スラリー濃度が低いほど洗浄ケーキの塩素量は低下していく。
Experimental Examples 17-20
Slurries were prepared by changing the slurry concentration, and each was subjected to solid-liquid separation with a filter press, and then washed with 500 parts by mass or more of washing water with respect to 100 parts by mass of incinerated ash. The results of measuring the amount of chlorine in the washed cake after washing are shown in Table 3 and FIG. 2 together with the slurry concentration and the like. As shown in this chart, the chlorine content of the washing cake decreases as the slurry concentration decreases.
実験例２１〜２７
１００質量部の焼却灰と２９００質量部の水を用意し、０乃至２７５０質量部の水を洗浄水として確保し、残部の水を用いて濃度の異なるスラリーを調製した。各々フィルタープレスで固液分離を行った後、洗浄水で洗浄を行った。洗浄後の洗浄ケーキの塩素量を測定した。結果を表４及び図３に示す。
Experimental Examples 21-27
100 parts by mass of incinerated ash and 2900 parts by mass of water were prepared, 0 to 2750 parts by mass of water were secured as washing water, and slurries with different concentrations were prepared using the remaining water. Each was subjected to solid-liquid separation with a filter press and then washed with washing water. The amount of chlorine in the washed cake after washing was measured. The results are shown in Table 4 and FIG.
Claims (3)
スラリー調製及び洗浄に使用できる合計水量をＹ質量部としたとき、
焼却灰１００質量部に対して、ろ過残渣を水洗する際に用いる水の量を５００〜２０００質量部とし、残部の水（Ｙ−５００〜Ｙ−２０００質量部）を全てスラリーを調製するために用いることを特徴とする焼却灰の水洗処理方法。 Incineration ash is used as a raw cement fuel, comprising a step of mixing incinerated ash with water in a slurry storage tank to form a slurry, a step of separating the slurry into washing ash and washing water, and a step of washing the filtration residue with water. In the water washing method for
When the total amount of water that can be used for slurry preparation and washing is Y parts by mass,
In order to prepare a slurry of all the remaining water (Y-500 to Y-2000 parts by mass) with respect to 100 parts by mass of incinerated ash, the amount of water used when washing the filtration residue with water is 500 to 2000 parts by mass. A method for washing with water of incinerated ash, characterized by being used.
焼却灰１００質量部に対して、ろ過残渣を水洗する際に用いる水の量を５００〜２０００質量部とし、かつ、前記スラリーの焼却灰濃度を１０質量％以下とする焼却灰の水洗処理方法。 Incineration ash is used as a raw cement fuel, comprising a step of mixing incinerated ash with water in a slurry storage tank to form a slurry, a step of separating the slurry into washing ash and washing water, and a step of washing the filtration residue with water. In the water washing method for
A method for washing incinerated ash with water, wherein the amount of water used for washing the filtration residue with respect to 100 parts by mass of incinerated ash is 500 to 2000 parts by mass, and the incinerated ash concentration of the slurry is 10% by mass or less.
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| JP2016137451A (en) * | 2015-01-28 | 2016-08-04 | 太平洋セメント株式会社 | Method and device for desalting and converting main ash into cement raw material |
| WO2023100541A1 (en) * | 2021-11-30 | 2023-06-08 | 太平洋セメント株式会社 | Method for desalting treatment of chlorine-containing powder |
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| JP2006110508A (en) * | 2004-10-18 | 2006-04-27 | Ebara Corp | Method and apparatus for washing and dehydrating incineration ash and/or cement kiln dust |
| JP2006150332A (en) * | 2004-10-27 | 2006-06-15 | Mitsubishi Materials Corp | Treatment method for dust |
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| JP2006110508A (en) * | 2004-10-18 | 2006-04-27 | Ebara Corp | Method and apparatus for washing and dehydrating incineration ash and/or cement kiln dust |
| JP2006150332A (en) * | 2004-10-27 | 2006-06-15 | Mitsubishi Materials Corp | Treatment method for dust |
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| JP2016137451A (en) * | 2015-01-28 | 2016-08-04 | 太平洋セメント株式会社 | Method and device for desalting and converting main ash into cement raw material |
| WO2023100541A1 (en) * | 2021-11-30 | 2023-06-08 | 太平洋セメント株式会社 | Method for desalting treatment of chlorine-containing powder |
| JP2023080949A (en) * | 2021-11-30 | 2023-06-09 | 太平洋セメント株式会社 | Desalination treatment method for chlorine-containing powder |
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