JP5954863B2 - Waste incineration ash treatment method and treatment equipment - Google Patents
Waste incineration ash treatment method and treatment equipment Download PDFInfo
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- JP5954863B2 JP5954863B2 JP2012042904A JP2012042904A JP5954863B2 JP 5954863 B2 JP5954863 B2 JP 5954863B2 JP 2012042904 A JP2012042904 A JP 2012042904A JP 2012042904 A JP2012042904 A JP 2012042904A JP 5954863 B2 JP5954863 B2 JP 5954863B2
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- 238000004056 waste incineration Methods 0.000 title claims description 36
- 238000000034 method Methods 0.000 title claims description 15
- 239000010419 fine particle Substances 0.000 claims description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 238000000227 grinding Methods 0.000 claims description 35
- 239000002002 slurry Substances 0.000 claims description 34
- 239000004568 cement Substances 0.000 claims description 27
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 23
- 229910052801 chlorine Inorganic materials 0.000 claims description 23
- 239000000460 chlorine Substances 0.000 claims description 23
- 150000003839 salts Chemical class 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 20
- 238000004090 dissolution Methods 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 15
- 238000000926 separation method Methods 0.000 claims description 13
- 239000011362 coarse particle Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 9
- 238000000354 decomposition reaction Methods 0.000 claims description 7
- 238000003672 processing method Methods 0.000 claims description 3
- 239000000843 powder Substances 0.000 description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 7
- 238000007664 blowing Methods 0.000 description 6
- 238000007873 sieving Methods 0.000 description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000013256 coordination polymer Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 235000007237 Aegopodium podagraria Nutrition 0.000 description 2
- 244000045410 Aegopodium podagraria Species 0.000 description 2
- 235000014429 Angelica sylvestris Nutrition 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000001238 wet grinding Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
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- Combined Means For Separation Of Solids (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Description
本発明は、都市ごみ焼却灰等のごみ焼却灰から塩素分を除去した後、セメント原料として有効利用する方法及び装置に関する。 The present invention relates to a method and an apparatus for effectively using as a cement raw material after removing chlorine from incineration ash such as municipal waste incineration ash.
都市ごみ等を焼却した際に発生する焼却灰（以下、「ごみ焼却灰」という）は、従来、そのほとんどが最終処分場で埋め立て処理されていたが、最終処分場の枯渇の虞に鑑み、近年、セメント原料として有効利用されている。 Most of the incineration ash (hereinafter referred to as “waste incineration ash”) generated when incinerating municipal waste has been landfilled at the final disposal site, but in view of the danger of depletion of the final disposal site, In recent years, it has been effectively used as a cement raw material.
セメント原料として有効利用するにあたって、ごみ焼却灰から事前に塩素分を除去する必要があるが、ごみ焼却灰のうち、焼却残渣として排出される主灰は、塩素分の含有率が１〜２％と、飛灰に比較して格段に少ないが、水溶性塩だけでなく難溶性のフリーデル氏塩を含むため、水洗処理だけでは脱塩率を高めることが困難であった。このフリーデル氏塩は、酸で容易に分解するので、脱塩率を向上させるため、主灰全量を適宜粉砕し、酸を用いてフリーデル氏塩を分解した後、セメント原料として有効利用している（例えば、特許文献１参照）。 In order to use it effectively as a raw material for cement, it is necessary to remove the chlorine content from the waste incineration ash in advance, but the main ash discharged as an incineration residue in the waste incineration ash has a chlorine content of 1-2%. However, since it contains not only water-soluble salts but also sparingly soluble Friedel's salt, it is difficult to increase the desalting rate only by washing with water. Since Friedel's salt is easily decomposed with acid, in order to improve the desalination rate, the total amount of main ash is pulverized appropriately, and Friedel's salt is decomposed with acid, and then effectively used as a raw material for cement. (For example, refer to Patent Document 1).
しかし、処理量の多い主灰の全量を対象として酸を用いてフリーデル氏塩を分解した後、セメント原料として有効利用すると、装置コスト及び運転コストが高騰するという問題があった。 However, when Friedel's salt is decomposed using acid for the entire amount of main ash with a large amount of treatment and then effectively used as a raw material for cement, there is a problem that the apparatus cost and the operating cost are increased.
そこで、本発明は、装置コスト及び運転コストを低く抑えながら、ごみ焼却灰、特に主灰をセメント原料として有効利用することを目的とする。 Therefore, an object of the present invention is to effectively use waste incineration ash, particularly main ash, as a cement raw material while keeping the apparatus cost and operation cost low.
上記目的を達成するため、本発明は、ごみ焼却灰の処理方法であって、研削刃を備える表面研削機を用いてごみ焼却灰の表面を研削し、該研削後のごみ焼却灰を、前記研削した表面部分を含む微粒子と、粗粒子とに分別し、該分別した微粒子に水を添加してスラリー化し、該スラリーを固液分離し、該固液分離によって得られたケーキをセメント原料として利用することを特徴とする。 In order to achieve the above object, the present invention provides a method for treating waste incineration ash, wherein the surface of the waste incineration ash is ground using a surface grinding machine equipped with a grinding blade , The fine particles including the ground surface portion and coarse particles are separated, and water is added to the separated fine particles to form a slurry. The slurry is solid-liquid separated, and the cake obtained by the solid-liquid separation is used as a cement raw material. It is characterized by using.
そして、本発明によれば、ごみ焼却灰の塩素分が多く偏在する微粒子側や粒子の表面部分のみを水洗処理することで、水洗処理対象物を少なくすることができるため、使用水量を低減し、運転コストを低く抑えることができる。 And according to the present invention, only the fine particle side and the surface portion of the particles that are unevenly distributed with a large amount of chlorine in the waste incineration ash can be washed with water, so that the number of washing objects can be reduced. The operating cost can be kept low.
上記ごみ焼却灰の処理方法において、前記表面研削をごみ焼却灰の水分量（湿灰又は乾灰）によって湿式又は乾式で行うことができる。水分を含む湿灰では、湿式の表面研削方法を用いる。一方、水分を含まない乾灰では、乾式の表面研削方法を用いる。 In the method for treating waste incineration ash, the surface grinding can be performed wet or dry depending on the amount of moisture (wet ash or dry ash) of the waste incineration ash. For wet ash containing moisture, a wet surface grinding method is used. On the other hand, for dry ash containing no moisture, a dry surface grinding method is used.
上記処理方法において、前記スラリーに酸を添加して該スラリー中の難溶性塩の分解を促進させ、該酸添加後のスラリーに対して前記固液分離を行うことができる。これにより、ごみ焼却灰に含まれる水溶性塩だけでなく難溶性塩も除去することができる。 In the above treatment method, the slurry by adding an acid and promotes decomposition of the sparingly soluble salt in the slurry, Ru can be performed the solid-liquid separation with respect to the slurry after the acid addition. Thereby , not only the water-soluble salt contained in the waste incineration ash but also the hardly soluble salt can be removed.
上記処理方法において、前記スラリーにセメントキルン排ガスを導入して該スラリー中の難溶性塩の分解を促進させ、該排ガス導入後のスラリーに対して前記固液分離を行うことができる。セメントキルン排ガスを利用することで、酸を添加する必要がなくなり、薬剤コストを不要とすることができる。 In the above processing method, cement kiln exhaust gas can be introduced into the slurry to promote decomposition of hardly soluble salts in the slurry, and the solid-liquid separation can be performed on the slurry after the exhaust gas is introduced. By using the cement kiln exhaust gas, it is not necessary to add an acid and the cost of the medicine can be eliminated.
上記処理方法において、前記表面部分を含む微粒子の最大粒径を１ｍｍ以下に調整することができる。これにより、微粒子側に濃縮させた塩素を少ない水量で効率よく水洗脱塩することができる。 In the above processing method, the maximum particle size of the fine particles including the surface portion can be adjusted to 1 mm or less. Thereby, the chlorine concentrated on the fine particle side can be efficiently washed and desalted with a small amount of water.
前記スラリー化において、前記研削した表面部分を含む微粒子に添加する水量を、該微粒子の量の１倍以上４倍以下に調整することができ、少ない水量で水洗を行い、運転コストを低く抑えることができる。 In the slurrying, the amount of water added to the fine particles including the ground surface portion can be adjusted to 1 to 4 times the amount of the fine particles, and the water is washed with a small amount of water to keep the operation cost low. Can do.
さらに、本発明は、ごみ焼却灰の処理装置であって、ごみ焼却灰の表面を研削する研削刃を備える表面研削機と、該研削後のごみ焼却灰を、前記研削した表面部分を含む微粒子と、粗粒子とに分別する篩装置と、該分別した微粒子に水を添加して該微粒子に含まれる塩素分を溶解させる溶解槽と、該溶解槽からのスラリーを固液分離するための固液分離機と、該固液分離によって得られたケーキをセメントキルンに投入する投入装置とを備えることを特徴とする。本発明によれば、上記発明と同様に、水洗処理対象物を少なくすることができ、使用水量を低減し、運転コストを低く抑えることができる。 Furthermore, the present invention is a waste incineration ash treatment apparatus, a surface grinding machine having a grinding blade for grinding the surface of the waste incineration ash, and fine particles including the ground surface portion of the ground waste incineration ash When a sieve device for separating the coarse particles, the dissolving tank for dissolving the chlorine component contained in the fine particles by adding water converting said different particulate solid to slurry solid-liquid separation from the dissolving tank It is characterized by comprising a liquid separator and a charging device for charging the cake obtained by the solid-liquid separation into a cement kiln. According to the present invention, similarly to the above-described invention, the number of objects to be washed can be reduced, the amount of water used can be reduced, and the operating cost can be kept low.
以上のように、本発明によれば、装置コスト及び運転コストを低く抑えながら、ごみ焼却灰をセメント原料として有効利用することができる。 As described above, according to the present invention, the waste incineration ash can be effectively used as a cement raw material while keeping the apparatus cost and the operation cost low.
次に、本発明を実施するための形態について、図面を参照しながら詳細に説明する。 Next, an embodiment for carrying out the present invention will be described in detail with reference to the drawings.
図１は、本発明に係るごみ焼却灰の処理装置（以下、適宜「処理装置」という）の一実施の形態を示し、この処理装置１は、ごみ焼却灰Ａ１の表面を研削する表面研削機２と、表面研削機２から排出された表面研削後のごみ焼却灰Ａ２を、研削した表面部分を含む微粒子ＦＰと、粗粒子ＣＰとに分別する篩装置３と、分別した微粒子ＦＰに水Ｗ１を添加して微粒子ＦＰに含まれる塩素分を溶解させる溶解槽４と、溶解槽４からのスラリーＳを固液分離するための固液分離機としてのフィルタープレス５と、固液分離によって得られたケーキＣをセメントキルン６に投入する投入装置（不図示）等を備える。
FIG. 1 shows an embodiment of a waste incineration ash treatment apparatus according to the present invention (hereinafter referred to as “treatment apparatus” as appropriate). This
表面研削機２は、例えば、回転する胴体と、該胴体と反対方向に回転する回転軸の両方に刃を備え、胴体側の回転刃と、回転軸側の回転刃との間でごみ焼却灰Ａ１の表面を研削する。この表面研削機２は、乾式又は湿式の両方式が存在する。 The surface grinding machine 2 includes, for example, blades on both a rotating body and a rotating shaft that rotates in a direction opposite to the rotating body, and waste incineration ash between the rotating blade on the body side and the rotating blade on the rotating shaft side. The surface of A1 is ground. The surface grinding machine 2 has both a dry type and a wet type.
篩装置３は、表面研削機２によって研削されたごみ焼却灰Ａ１の表面部分を含む微粒子ＦＰと、粗粒子ＣＰとに分別するために備えられ、湿式又は乾式の振動式や回転式の篩装置等を用いることができる。
Sieving device 3, and the fine particles FP that contains the table surface portion of waste incineration ash A1 which is ground by a surface grinding machine 2, provided for separating the coarse particles CP, wet or dry vibratory or rotary sieve A device or the like can be used.
溶解槽４は、セメントキルン６からの排ガスＧ１を槽内に吹き込むための吹込装置４ａを備え、分別した微粒子ＦＰに水Ｗ１を添加してスラリー化し、微粒子ＦＰに含まれる水溶性塩素分を水Ｗ１に溶解させると共に、槽内に吹き込んだ排ガスＧ１に含まれる炭酸ガス（ＣＯ2）によって発生した炭酸によってフリーデル氏塩を分解する。
The dissolution tank 4 is provided with a blowing device 4a for blowing the exhaust gas G1 from the
フィルタープレス５は、溶解槽４から排出されたスラリーＳを固液分離すると共に、スラリーＳに洗浄水Ｗ２を供給して洗浄しながら固液分離する洗浄装置５ａを備える。フィルタープレス５以外にもベルトフィルタ等を用いることもできる。
The
次に、上記構成を有するごみ焼却灰の処理装置１を用いた処理方法について、図１を参照しながら説明する。尚、以下の説明においては、乾式の表面研削機２及び篩装置３を用いる場合について説明する。
Next, a treatment method using the waste incineration
ごみ焼却灰Ａ１を表面研削機２に投入し、ごみ焼却灰Ａ１の表面を研削する。表面研削機２から排出された表面研削後のごみ焼却灰Ａ２を篩装置３に供給し、研削された表面部分を含む微粒子ＦＰと、粗粒子ＣＰとに分別する。ここで、微粒子ＦＰの最大粒径を１ｍｍ以下に調整することが好ましく、微粒子ＦＰの最大粒径が１ｍｍを超えると、水洗処理対象物が増加し、水洗用の使用水量の低減効果が低下するため好ましくない。 The waste incineration ash A1 is put into the surface grinding machine 2 and the surface of the waste incineration ash A1 is ground. The incinerated ash A2 after surface grinding discharged from the surface grinding machine 2 is supplied to the sieving device 3, and is separated into fine particles FP including the ground surface portion and coarse particles CP. Here, it is preferable to adjust the maximum particle size of the fine particles FP to 1 mm or less. When the maximum particle size of the fine particles FP exceeds 1 mm, the number of objects to be washed increases and the effect of reducing the amount of water used for washing decreases. Therefore, it is not preferable.
次に、表面研削機２によって研削された表面部分を含む微粒子ＦＰを溶解槽４に供給する。尚、この研削された表面部分を含む微粒子ＦＰとは、表面研削機２によって研削された表面部分だけでなく、ごみ焼却灰Ａ１に当初から含まれる微粉も含むものである。一方、篩装置３で分別された粗粒子ＣＰは、系外にて別途処理する。 Next, the fine particles FP including the surface portion ground by the surface grinder 2 are supplied to the dissolution tank 4. The fine particles FP including the ground surface portion include not only the surface portion ground by the surface grinding machine 2 but also fine powder contained in the incineration ash A1 from the beginning. On the other hand, the coarse particles CP separated by the sieving device 3 are separately processed outside the system.
溶解槽４において、微粒子ＦＰと水Ｗ１とを混合撹拌してスラリーＳを生成し、溶解槽４において、微粒子ＦＰに含まれる水溶性塩素分を水Ｗ１に溶解させる。この際、微粒子ＦＰに添加する水Ｗ１の量を、微粒子ＦＰの量の１倍以上４倍以下に調整することが好ましい。水Ｗ１の量が微粒子ＦＰの１倍未満であると、微粒子ＦＰからの塩素の溶出が十分でなく、４倍を超えると、排水量が多くなり好ましくない。 In the dissolution tank 4, the fine particles FP and the water W1 are mixed and stirred to produce a slurry S. In the dissolution tank 4, water-soluble chlorine contained in the fine particles FP is dissolved in the water W1. At this time, the amount of water W1 added to the fine particles FP is preferably adjusted to 1 to 4 times the amount of the fine particles FP. If the amount of water W1 is less than 1 times that of the fine particles FP, the elution of chlorine from the fine particles FP is not sufficient, and if it exceeds 4 times, the amount of drainage is undesirably increased.
これと同時に、スラリーＳに吹込装置４ａよりセメントキルン６の排ガスＧ１を吹き込み、排ガスＧ１に含まれるＣＯ2によって発生した炭酸によってフリーデル氏塩を分解する。一方、溶解槽４からの排ガスＧ２は、適宜排ガス処理を施した後大気に放出する。
At the same time, the exhaust gas G1 of the
尚、フリーデル氏塩とは、化学式で表すと、３ＣａＯ・Ａｌ2Ｏ3・ＣａＣｌ2・１０Ｈ2Ｏであり、下記のように、アルミン酸三石灰（３ＣａＯ・Ａｌ2Ｏ3）が水和反応の際に塩化物イオンを取り込んで生成される塩である。
３ＣａＯ・Ａｌ2Ｏ3＋ＣａＣｌ2＋１０Ｈ2Ｏ→３ＣａＯ・Ａｌ2Ｏ3・ＣａＣｌ2・１０Ｈ2Ｏ
In addition, Friedel's salt is 3CaO · Al 2 O 3 · CaCl 2 · 10H 2 O in chemical formula, and trilime aluminate (3CaO · Al 2 O 3 ) is hydrated as described below. It is a salt produced by taking in chloride ions during the reaction.
3CaO.Al 2 O 3 + CaCl 2 + 10H 2 O → 3CaO.Al 2 O 3 .CaCl 2 .10H 2 O
上述のように、スラリーＳに吹込装置４ａよりセメントキルン６の排ガスＧ１を吹き込むと、下式に示すように、フリーデル氏塩を分解することができ、溶解槽４において主灰の脱塩を行うことができる。
３ＣａＯ・Ａｌ2Ｏ3・ＣａＣｌ2・１０Ｈ2Ｏ＋３ＣＯ2→３ＣａＣＯ3＋２Ａｌ（ＯＨ）3＋ＣａＣｌ2＋７Ｈ2Ｏ
As described above, when the exhaust gas G1 of the
3CaO · Al 2 O 3 · CaCl 2 · 10H 2 O + 3CO 2 → 3CaCO 3 + 2Al (OH) 3 + CaCl 2 + 7H 2 O
次に、溶解槽４から排出されたスラリーＳをフィルタープレス５に供給し、洗浄装置５ａからの水Ｗ２によってスラリーＳを洗浄しながら固液分離して脱塩ケーキＣとろ液（塩水）Ｌとに分離する。スラリーＳの洗浄に用いた水Ｗ２は、洗浄装置５から排水Ｗ３として排出されて溶解槽４に戻される。
Next, the slurry S discharged from the dissolution tank 4 is supplied to the
フィルタープレス５で塩素分が除去された脱塩ケーキＣをセメントキルン６に投入装置を介して投入してセメント原料として利用する。一方、塩素分を含むろ液Ｌは、一部を循環水Ｌ１として溶解槽４等に戻すと共に、残りの排水Ｌ２に適宜排水処理を施した後、系外へ排出する。
The desalted cake C from which the chlorine content has been removed by the
以上のように、本実施の形態によれば、表面研削機２によってごみ焼却灰Ａ１の表面を研削し、研削した表面部分を含む、塩素分が多く偏在する微粒子ＦＰのみをスラリー化して水洗して脱塩することで、使用水量を低減し、運転コストを低く抑えることができる。 As described above, according to the present embodiment, the surface of the refuse incineration ash A1 is ground by the surface grinder 2, and only the fine particles FP containing a large amount of chlorine and unevenly distributed including the ground surface portion are slurried and washed with water. Thus, the amount of water used can be reduced and the operating cost can be kept low.
これに加え、溶解槽４においてスラリー化したごみ焼却灰Ａ２に排ガスＧ１を吹き込むことで、ごみ焼却灰Ａ２に含まれる難溶性塩の分解を促進させることができるため、塩素分をさらに低減することができる。尚、排ガスＧ１を吹き込むことで、薬剤を用いることなく難溶性塩の分解を促進させることができて好ましいが、排ガスＧ１を吹き込まずに、溶解槽４に、硝酸、炭酸、硫酸、亜硝酸、塩酸、酢酸等の酸を添加して難溶性塩の分解を促進させることもできる。 In addition to this, by blowing the exhaust gas G1 into the waste incineration ash A2 slurried in the dissolution tank 4, the decomposition of the hardly soluble salt contained in the waste incineration ash A2 can be promoted, so that the chlorine content is further reduced. Can do. It is preferable to blow the exhaust gas G1 because the decomposition of the hardly soluble salt can be promoted without using a chemical. However, nitric acid, carbonic acid, sulfuric acid, nitrous acid, An acid such as hydrochloric acid or acetic acid can be added to promote the decomposition of the hardly soluble salt.
また、上記実施の形態においては、乾式の表面研削機２及び篩装置３を用いた場合について説明したが、湿式の表面研削機２及び篩装置３を用いることもできる。その場合には、表面研削機２に水を供給すると共に、循環水Ｌ１を表面研削機２や篩装置３に戻すことができる。湿式で表面改質や篩い分けを行うことで、水分を含んだ湿灰に対して有効である。 Moreover, in the said embodiment, although the case where the dry type surface grinder 2 and the sieve apparatus 3 were used was demonstrated, the wet type surface grinder 2 and the sieve apparatus 3 can also be used. In that case, while supplying water to the surface grinding machine 2, the circulating water L1 can be returned to the surface grinding machine 2 and the sieve device 3. By wet surface modification and sieving, it is effective for wet ash containing moisture.
次に、本発明に係るごみ焼却灰の処理方法及び処理装置の実施例について説明する。 Next, examples of the method and apparatus for treating waste incineration ash according to the present invention will be described.
実施例として、埼玉県内のごみ焼却施設から受け入れた主灰の表面を表面研削機（新六精機株式会社製ハリケーンを使用）で研削し、研削した表面部分を含む微粒子（最大粒径０．５ｍｍ以下）と、粗粒子とに分別し、分別した微粒子に水を添加してスラリー化し、スラリーにセメントキルンの排ガスを吹き込まない場合（実施例１）と、セメントキルンの排ガスを吹き込んだ場合（実施例２）、比較例として、主灰の表面を研削せずに水を添加してスラリー化し、スラリーにセメントキルンの排ガスを吹き込まない場合（比較例１）と、セメントキルンの排ガスを吹き込んだ場合（比較例２）とを比較した。その結果を表１に示す。 As an example, the surface of main ash received from a waste incineration facility in Saitama Prefecture was ground with a surface grinding machine (using a hurricane made by Shinroku Seiki Co., Ltd.), and fine particles containing the ground surface portion (maximum particle size 0.5 mm) Below) and coarse particles, water is added to the separated fine particles to make a slurry, and cement kiln exhaust gas is not blown into the slurry (Example 1), and cement kiln exhaust gas is blown (implemented) Example 2) As a comparative example, when the surface of the main ash is not ground and water is added to make a slurry, and the cement kiln exhaust gas is not blown into the slurry (Comparative Example 1), and the cement kiln exhaust gas is blown (Comparative Example 2) was compared. The results are shown in Table 1.
同表より、実施例１と比較例２とは、略々同等の脱塩率を示したが、実施例２については、脱塩率が大幅に上昇し、主灰の表面研削とセメントキルンの排ガスの導入を共に行うことで、主灰からの塩素分の除去効率が大きく上昇することが判る。 From the table, Example 1 and Comparative Example 2 showed substantially the same salt rejection, but for Example 2, the salt rejection increased significantly, and the main ash surface grinding and cement kiln It can be seen that the efficiency of removing chlorine from the main ash greatly increases when the exhaust gas is introduced together.
また、埼玉県内のごみ焼却施設から受け入れた主灰の表面を湿式研削し、湿式研削された主灰スラリーを乾燥させ、乾燥物を篩い分けて得られた粒度分布と、粒群毎の塩素濃度を測定し、主灰の原粉について同様のことを行って、粒度分布及び粒群毎の塩素濃度を比較した。塩素濃度は、蛍光Ｘ線分析により測定した。 In addition, the particle size distribution obtained by wet grinding the main ash surface received from a waste incineration facility in Saitama Prefecture, drying the wet ground ash slurry, and sieving the dried product, and the chlorine concentration for each particle group The same thing was done about the raw powder of the main ash, and the particle size distribution and the chlorine concentration for every particle group were compared. Chlorine concentration was measured by fluorescent X-ray analysis.
図２は、上記のように表面研削した主灰と、主灰原粉の粒度分布を示す。同図より、表面研削により粒径の小さい領域での頻度が増加し、粒径の大きい領域での頻度が減少し、微粒子の量が増加していることが判る。 FIG. 2 shows the main ash whose surface has been ground as described above and the particle size distribution of the main ash raw powder. From the figure, it can be seen that surface grinding increases the frequency in the small particle size region, decreases the frequency in the large particle size region, and increases the amount of fine particles.
図３は、上記表面研削した主灰と、主灰原粉の粒群毎の塩素濃度を示す。同図より、粒径０．１５ｍｍ以下の塩素頻度が原粉よりも大きくなっていることが判る。これにより、表面研削及び篩分けにより得られた微粒子のみを水洗処理することで、少ない使用水量で効果的に塩素分を除去できることが判る。 FIG. 3 shows the main ground ash and the chlorine concentration for each grain group of the main ash raw powder. From the figure, it can be seen that the frequency of chlorine having a particle size of 0.15 mm or less is larger than that of the raw powder. Thereby, it turns out that only the fine particles obtained by surface grinding and sieving can be washed with water to effectively remove the chlorine content with a small amount of water used.
１ ごみ焼却灰の処理装置
２ 表面研削機
３ 篩装置
４ 溶解槽
４ａ 吹込装置
５ フィルタープレス
５ａ 洗浄装置
６ セメントキルン
Ａ１ ごみ焼却灰（原粉）
Ａ２ ごみ焼却灰（表面研削後）
Ｃ ケーク
ＣＰ 粗粒子
ＦＰ 微粒子
Ｇ１ （セメントキルンの）排ガス
Ｇ２ （溶解槽の）排ガス
Ｌ ろ液
Ｌ１ 循環水
Ｌ２ 排水
Ｓ スラリー
Ｗ１ 水
Ｗ２ 洗浄水
Ｗ３ 排水
DESCRIPTION OF
A2 Waste incineration ash (after surface grinding)
C Cake CP Coarse particles FP Fine particles G1 Exhaust gas G2 (from cement kiln) Exhaust gas L (from dissolution tank) Filtrate L1 Circulating water L2 Drainage S Slurry W1 Water W2 Washing water W3 Drainage
Claims (7)
該研削後のごみ焼却灰を、前記研削した表面部分を含む微粒子と、粗粒子とに分別し、
該分別した微粒子に水を添加してスラリー化し、
該スラリーを固液分離し、
該固液分離によって得られたケーキをセメント原料として利用することを特徴とするごみ焼却灰の処理方法。 Grind the surface of waste incineration ash using a surface grinder equipped with a grinding blade ,
The incinerated ash after grinding is separated into fine particles including the ground surface portion and coarse particles,
Water is added to the fractionated fine particles to make a slurry,
The slurry is solid-liquid separated,
A method for treating waste incineration ash, wherein the cake obtained by the solid-liquid separation is used as a cement raw material.
該研削後のごみ焼却灰を、前記研削した表面部分を含む微粒子と、粗粒子とに分別する篩装置と、
該分別した微粒子に水を添加して該微粒子に含まれる塩素分を溶解させる溶解槽と、
該溶解槽からのスラリーを固液分離するための固液分離機と、
該固液分離によって得られたケーキをセメントキルンに投入する投入装置とを備えることを特徴とするごみ焼却灰の処理装置。 A surface grinding machine equipped with a grinding blade for grinding the surface of garbage incineration ash;
A sieve device for separating the incinerated ash after grinding into fine particles including the ground surface portion and coarse particles;
A dissolution tank for adding water to the separated fine particles to dissolve chlorine contained in the fine particles;
A solid-liquid separator for solid-liquid separation of the slurry from the dissolution tank;
A waste incineration ash treatment apparatus, comprising: a charging device for charging a cake obtained by the solid-liquid separation into a cement kiln.
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| JP6198635B2 (en) * | 2014-02-27 | 2017-09-20 | 太平洋セメント株式会社 | Method and apparatus for converting incinerated ash into cement raw material |
| JP6226776B2 (en) * | 2014-02-28 | 2017-11-08 | 太平洋セメント株式会社 | Method and apparatus for converting incinerated ash into cement raw material |
| JP6198651B2 (en) * | 2014-03-20 | 2017-09-20 | 太平洋セメント株式会社 | Method and apparatus for converting incinerated ash into cement raw material |
| CN104190690B (en) * | 2014-08-06 | 2016-05-04 | 华南理工大学 | A kind of method and application that utilizes ammonia-soda process alkaline residue to prepare dechlorination alkaline residue mixture |
| JP6521482B2 (en) * | 2015-03-26 | 2019-05-29 | Ｊｆｅエンジニアリング株式会社 | Incineration ash treatment apparatus, waste incineration apparatus, incineration ash treatment method and waste incineration method |
| CN105478225B (en) * | 2016-01-05 | 2019-04-19 | 北京科技大学 | A kind of tailings Grading And Zoning high concentration exhaust system and discharge method |
| SG11202101617RA (en) * | 2018-09-10 | 2021-03-30 | Taiheiyo Cement Corp | Washing treatment method for chlorine-containing powder, and washing treatment system for chlorine-containing powder |
| CN109520295B (en) * | 2018-11-26 | 2020-05-05 | 江苏鹏飞集团股份有限公司 | Cement decomposing furnace processing system capable of feeding materials vertically in layered mode |
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