JP2000279919A - Method of recycling incineration ash - Google Patents
Method of recycling incineration ashInfo
- Publication number
- JP2000279919A JP2000279919A JP11088431A JP8843199A JP2000279919A JP 2000279919 A JP2000279919 A JP 2000279919A JP 11088431 A JP11088431 A JP 11088431A JP 8843199 A JP8843199 A JP 8843199A JP 2000279919 A JP2000279919 A JP 2000279919A
- Authority
- JP
- Japan
- Prior art keywords
- incinerated ash
- incineration ash
- roasting
- ash
- incineration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、焼却灰の資源化方
法に関する。[0001] The present invention relates to a method for recycling incinerated ash.
【０００２】[0002]
【従来の技術】従来、廃棄物、特に生ごみや下水汚泥等
の廃棄物、産業廃棄物等は、一般に、焼却炉において燃
焼することにより処理されてきたが、焼却後に炉から大
量の焼却灰が排出され、かかる焼却灰中には有毒な重金
属やダイオキシンが含まれていることから、その処分に
つき、大きな問題となっている。2. Description of the Related Art Conventionally, wastes, particularly wastes such as garbage and sewage sludge, and industrial wastes have been generally treated by burning in incinerators. Is emitted, and since such incinerated ash contains toxic heavy metals and dioxins, disposal thereof poses a serious problem.
【０００３】近年、このような焼却灰を単に廃棄するの
ではなく、その有効利用を図るべく、資源化する試みが
なされている。そのような焼却灰の資源化、再利用方法
として、焼却灰を溶融・スラグ化する方法（特開平１０
―２８９５３号公報、特開平１０―１９２８１４号公
報）や、焼却灰を焙焼する方法（特許第２７０６６３４
号、特開平８―３１８２５５号公報）が提案されてい
る。[0003] In recent years, attempts have been made to recycle such incinerated ash as resources, in order to make effective use of the ash instead of simply discarding it. As a method of recycling and reusing such incinerated ash, a method of melting and converting slag to incinerated ash (Japanese Unexamined Patent Application Publication No.
-28953, JP-A-10-192814) and a method of roasting incinerated ash (Japanese Patent No. 2706634).
No. JP-A-8-318255) has been proposed.
【０００４】図７および図８に、従来の焼却灰焙焼プロ
セスを示す。図７に示すプロセスでは、破砕機により焼
却灰を破砕し、粗大物除去装置により粗大物を除去した
焼却灰を、焼却灰ホッパを介して焙焼装置に投入し、焙
焼し、その排ガスを排ガス処理装置により大気中に放出
し、焙焼された焼却灰を篩にかけて、製品とするもので
ある。FIGS. 7 and 8 show a conventional incineration ash roasting process. In the process shown in FIG. 7, the incinerated ash is crushed by a crusher, and the incinerated ash from which the bulky matter is removed by the bulky matter removing device is put into a torrefaction device via a incineration ash hopper, torrefaction and the exhaust gas is discharged. The incinerated ash released into the atmosphere by the exhaust gas treatment device and roasted is sieved to obtain a product.
【０００５】これに対し、図８に示すプロセスでは、図
７に示すプロセスと同様、破砕し、粗大物を除去した焼
却灰を、鉄選別機により鉄分を除去し、非鉄選別機によ
り非鉄金属分を除去しており、即ち、図８に示すプロセ
スは、鉄選別よび非鉄選別工程を設けた以外は、図７に
示すプロセスと同様である。On the other hand, in the process shown in FIG. 8, as in the process shown in FIG. 7, the incinerated ash which has been crushed and the bulky matter removed is removed from the incinerated ash by an iron separator, and the non-ferrous metal component is removed by a non-ferrous separator. 8, that is, the process shown in FIG. 8 is the same as the process shown in FIG. 7 except that iron and non-ferrous sorting steps are provided.
【０００６】しかし、以上説明した従来の方法のうち、
焼却灰を溶融・スラグ化する方法は、焼却灰をその融点
（約１３００℃以上）以上の高温に加熱する必要がある
ことから、多量のエネルギーを必要とするという難点が
ある。However, among the conventional methods described above,
The method of melting and converting slag to incineration ash has a drawback that a large amount of energy is required because it is necessary to heat the incineration ash to a high temperature higher than its melting point (about 1300 ° C. or higher).
【０００７】一方、図７や図８に示すような焼却灰焙焼
プロセスでは、焙焼温度が低いと（例えば３００〜５０
０℃）、重金属の揮散が不十分となり、焙焼後に薬剤を
添加したり、水洗するなどの、新たな重金属防止策をと
る必要がある。焙焼温度が高い場合（例えば５００〜１
３００℃）には、沸点の低い重金属は揮散するが、沸点
が高いＣｒは揮散せず、Ｃｒの酸化反応によりＣｒ６＋
が生成するので、その溶出を防止することが課題とな
る。On the other hand, in the incineration ash roasting process as shown in FIGS. 7 and 8, if the roasting temperature is low (for example, 300 to 50).
0 ° C), the volatilization of heavy metals becomes insufficient, and it is necessary to take new heavy metal prevention measures such as adding a chemical after roasting or washing with water. When the roasting temperature is high (for example, 500 to 1
(300 ° C.), heavy metals having a low boiling point volatilize, but Cr having a high boiling point does not volatilize, and Cr 6+
Is generated, and it is a problem to prevent the elution.
【０００８】[0008]
【発明が解決しようとする課題】本発明は、このような
事情の下になされ、多量のエネルギーを必要とせず、し
かも焙焼後に新たな重金属防止策をとることなく、焼却
灰の再利用を可能とする焼却灰の資源化方法を提供する
ことを目的とする。DISCLOSURE OF THE INVENTION The present invention has been made under such circumstances, and does not require a large amount of energy, and does not require a new heavy metal prevention measure after roasting. An object of the present invention is to provide a method for recycling incinerated ash that can be used.
【０００９】[0009]
【課題を解決するための手段】本発明者らは、焼却灰の
高温での焙焼により沸点の低い重金属を揮散させるとと
もに、沸点の高いＣｒについては、還元剤の添加により
その酸化を防止し、またはベントナイトの添加によりＣ
ｒ６＋の溶出を防止し得ることを見出し、本発明をなす
に至った。本発明は、かかる知見に基づくものである。Means for Solving the Problems The present inventors volatilize heavy metals having a low boiling point by roasting incinerated ash at a high temperature, and prevent oxidation of Cr having a high boiling point by adding a reducing agent. Or by addition of bentonite
It has been found that elution of r 6+ can be prevented, and the present invention has been accomplished. The present invention is based on such findings.
【００１０】即ち、本発明は、焼却灰に還元剤を添加す
る工程、還元剤が添加された焼却灰を、焼却灰の融点以
下で、かつ低沸点重金属を揮散させるに十分な温度で焙
焼する工程、および焙焼された焼却灰を資源として回収
する工程を具備することを特徴とする焼却灰の資源化方
法を提供する。That is, the present invention provides a step of adding a reducing agent to incinerated ash, and roasting the incinerated ash to which the reducing agent has been added at a temperature below the melting point of the incinerated ash and at a temperature sufficient to volatilize low-boiling heavy metals. And a step of recovering the roasted incinerated ash as a resource.
【００１１】また、本発明は、焼却灰にベントナイトを
添加する工程、ベントナイトが添加された焼却灰を、焼
却灰の融点以下で、かつ低沸点重金属を揮散させるに十
分な温度で焙焼する工程、および焙焼された焼却灰を資
源として回収する工程を具備することを特徴とする焼却
灰の資源化方法を提供する。Further, the present invention provides a step of adding bentonite to incinerated ash, and a step of roasting incinerated ash to which bentonite has been added at a temperature below the melting point of incinerated ash and at a temperature sufficient to volatilize low-boiling heavy metals. And a step of recovering the roasted incinerated ash as a resource.
【００１２】以上の本発明の焼却灰の資源化方法におい
て、焼却灰を焙焼する前または後に、焼却灰から鉄分お
よび／または非鉄金属を除去し、回収することが望まし
い。また、焼却灰の焙焼により生じた排ガスを、廃棄物
の焼却により生じた排ガスと一緒に処理することが出来
る。そうすることにより、より効率のよい排ガスの処理
を行うことが出来る。In the above-mentioned method for recycling incinerated ash of the present invention, it is desirable to remove and recover iron and / or non-ferrous metals from the incinerated ash before or after roasting the incinerated ash. Further, the exhaust gas generated by the incineration ash roasting can be treated together with the exhaust gas generated by the waste incineration. By doing so, more efficient treatment of exhaust gas can be performed.
【００１３】なお、還元剤とベントナイトの双方を添加
することも可能である。即ち、還元剤の添加により、焙
焼により揮散しなかったＣｒの酸化の防止を図るととも
に、Ｃｒが酸化してＣｒ６＋が生成したとしても、ベン
トナイトの添加により、ベントナイトが焼却灰を覆うこ
とになり、 Ｃｒ６＋の溶出を防止することが出来る。It is also possible to add both a reducing agent and bentonite. That is, the addition of the reducing agent prevents the oxidation of Cr that has not been volatilized by roasting, and the bentonite covers the incinerated ash by the addition of bentonite even if Cr is oxidized to generate Cr 6+. And elution of Cr 6+ can be prevented.
【００１４】焙焼により揮散する低沸点重金属として
は、Ｐｂ、Ｚｎ、Ｈｇ、Ａｓ、Ｓｅ等を挙げることが出
来る。焙焼温度、即ち、焼却灰の融点以下で、かつ低沸
点重金属を揮散させるに十分な温度は、５００〜１３０
０℃であることが望ましい。The low-boiling heavy metals volatilized by roasting include Pb, Zn, Hg, As, Se and the like. The roasting temperature, that is, a temperature not higher than the melting point of the incinerated ash and sufficient to volatilize the low-boiling heavy metals is 500 to 130.
Desirably, the temperature is 0 ° C.
【００１５】以上のように構成される本発明の焼却灰の
資源化方法においては、焼却灰に還元剤および／または
ベントナイトを添加し、次いで低沸点重金属を揮散させ
るに十分な温度で焙焼している。それによって沸点の低
い重金属を揮散させるとともに、沸点の高いＣｒについ
ては、還元剤の添加によりその酸化を防止し、および／
またはベントナイトの添加によりＣｒ６＋の溶出を防止
することが出来る。In the method for recycling incinerated ash of the present invention configured as described above, a reducing agent and / or bentonite are added to the incinerated ash, and then the ash is roasted at a temperature sufficient to volatilize low-boiling heavy metals. ing. As a result, heavy metals having a low boiling point are volatilized, and oxidation of Cr having a high boiling point is prevented by adding a reducing agent, and / or
Alternatively , elution of Cr 6+ can be prevented by adding bentonite.
【００１６】その結果、重金属やダイオキシン等の有毒
物質を含まない、無害な焼却灰を回収することが出来
る。回収された焼却灰は、土木用資材、建材等として、
広範な用途に用いることが出来る。As a result, harmless incinerated ash that does not contain toxic substances such as heavy metals and dioxins can be recovered. The collected incinerated ash is used as civil engineering materials, building materials, etc.
Can be used for a wide range of applications.
【００１７】[0017]
【発明の実施の形態】以下、図面を参照して、本発明の
実施の形態について説明する。本発明の第１の実施形態
は、焼却灰の焙焼の際に、還元剤を添加するものであ
る。図１は、本発明の第１の実施形態に係る焼却灰焙焼
プロセスを示す図である。図１において、焼却炉から排
出された焼却灰は、まず破砕機により平均サイズが５ｍ
ｍ〜３０ｍｍとなるように破砕され、次いで粗大物除去
装置によりサイズ３００ｍｍ以上の粗大物が除去され
る。Embodiments of the present invention will be described below with reference to the drawings. In the first embodiment of the present invention, a reducing agent is added when roasting incinerated ash. FIG. 1 is a diagram showing an incineration ash roasting process according to the first embodiment of the present invention. In FIG. 1, the incineration ash discharged from the incinerator has an average size of 5 m by a crusher.
It is crushed so as to have a size of m to 30 mm, and then a coarse substance having a size of 300 mm or more is removed by a coarse substance removing device.
【００１８】粗大物が除去された焼却灰は、次に焼却灰
ホッパーに投入される。焼却灰ホッパーは焙焼装置に接
続されており、その経路の途中に還元剤ホッパーが配置
され、焼却灰に還元剤を添加出来るようにされている。
還元剤は、Ｃｒの酸化反応によるＣｒ６＋の生成を防止
するために添加されるものであり、コークスや微粉炭等
の炭素質材料を用いることが出来る。The incinerated ash from which the bulky matter has been removed is then introduced into an incinerated ash hopper. The incineration ash hopper is connected to a roasting device, and a reducing agent hopper is arranged in the middle of the route, so that a reducing agent can be added to the incineration ash.
The reducing agent is added to prevent the generation of Cr 6+ by the oxidation reaction of Cr, and a carbonaceous material such as coke or pulverized coal can be used.
【００１９】還元剤の粒度は、特に限定されないが、あ
まり細かすぎると飛散して取り扱いにくくなり、粗過ぎ
ると焼却灰中への均一な分布が困難となることから、５
ｍｍ〜３０ｍｍ程度が適当である。The particle size of the reducing agent is not particularly limited, but if it is too fine, it will scatter and become difficult to handle, and if it is too coarse, uniform distribution in the incineration ash will be difficult.
About 30 mm is suitable.
【００２０】なお、焼却灰中に添加される還元剤の量
は、焼却灰重量の２５重量％以下が好ましく、より好ま
しくは１〜２５重量％がよい。２５重量を越えても、そ
れ以上の効果は期待出来ないからである。The amount of the reducing agent added to the incineration ash is preferably not more than 25% by weight of the weight of the incineration ash, more preferably 1 to 25% by weight. Even if the weight exceeds 25, no further effect can be expected.
【００２１】還元剤が添加された焼却灰は、次いで焙焼
装置、例えばロータリーキルン内で焙焼される。焙焼温
度は、焼却灰の融点より低い、５００〜１３００℃が好
ましい。このように高温での焙焼により、沸点の低い、
Ｐｂ、Ｚｎ、Ｈｇ、Ａｓ等のＣｒ以外の重金属は揮散し
てしまうので、焙焼後に、新たな重金属の除去策をとる
必要はない。また、ダイオキシン等の有害有機物質は、
このような高温下で分解され、無害化される。The incinerated ash to which the reducing agent has been added is then roasted in a roasting device, for example, a rotary kiln. The roasting temperature is preferably 500 to 1300 ° C., which is lower than the melting point of the incinerated ash. By roasting at such a high temperature, the boiling point is low,
Since heavy metals other than Cr, such as Pb, Zn, Hg, and As, volatilize, it is not necessary to take new measures for removing heavy metals after roasting. In addition, harmful organic substances such as dioxin,
It is decomposed and detoxified under such high temperature.
【００２２】なお、焙焼温度が５００℃未満では、Ｐ
ｂ、Ｚｎ、Ｈｇ、Ａｓ等のＣｒ以外の重金属の揮散が不
十分となり、これら重金属は焼却灰中に残留し、焼却灰
の再利用を妨げてしまう。一方、焙焼温度が１３００℃
を越えても、それ以上の効果は得られず、エネルギーの
損失となってしまう。If the roasting temperature is lower than 500 ° C., P
The volatilization of heavy metals other than Cr, such as b, Zn, Hg, and As, becomes insufficient, and these heavy metals remain in the incineration ash and hinder the reuse of the incineration ash. On the other hand, the roasting temperature is 1300 ° C
Beyond the above, no further effect is obtained, resulting in energy loss.
【００２３】焼却灰の焙焼においては、Ｃｒ２Ｏ３の形
で存在するＣｒは、以下の反応式に従って、酸化され、
Ｃｒ６＋を含むクロム酸カルシウムが生成されるが、還
元剤の存在により酸素の供給が抑制されるので、そのよ
うな酸化反応は進行しない。In the roasting of incinerated ash, Cr present in the form of Cr 2 O 3 is oxidized according to the following reaction formula:
Although calcium chromate containing Cr 6+ is produced, such an oxidation reaction does not proceed because the supply of oxygen is suppressed by the presence of the reducing agent.
【００２４】２Ｃｒ２Ｏ３＋４ＣａＯ＋３Ｏ２ → ４
ＣａＣｒＯ４（ Ｃｒ６＋）焙焼炉の熱源は、灯油、重
油、ＲＤＦ等、各種の燃料を使用することが出来る。加
熱方式は、直接バーナーで加熱する方法、別途熱風を生
成し、焙焼炉内に送り込む方法等がある。2Cr 2 O 3 + 4CaO + 3O 2 → 4
As a heat source of the CaCrO 4 (Cr 6+ ) roasting furnace, various fuels such as kerosene, heavy oil, and RDF can be used. As a heating method, there is a method of directly heating with a burner, a method of separately generating hot air, and sending it into a roasting furnace.
【００２５】焙焼装置内で焙焼された後の焼却灰は、篩
にかけられて、焼結等により粗大化したものが除かれ、
回収される。焙焼装置からの排ガスは、排ガス処理装置
により処理された後、大気中に放出される。回収された
焼却灰は、土木用資材、建材等として、広い用途への利
用が可能である。[0025] The incinerated ash after roasting in the roasting apparatus is sieved to remove coarsened sinter and the like.
Collected. The exhaust gas from the roasting device is released into the atmosphere after being processed by the exhaust gas treatment device. The collected incinerated ash can be used for a wide range of purposes as civil engineering materials, building materials, and the like.
【００２６】図２は、本発明の第１の形態の変形例に係
る焼却灰焙焼プロセスを示す図である。図２に示すプロ
セスでは、図１に示すプロセスと同様、破砕し、粗大物
を除去した焼却灰を、鉄選別機により鉄分を除去し、非
鉄選別機により非鉄金属分を除去しており、即ち、図２
に示すプロセスは、鉄選別よび非鉄選別工程を設けた以
外は、図１に示すプロセスと同様である。なお、鉄選別
よび非鉄選別工程は、焙焼前に限らず、焙焼後に行うこ
とも可能である。FIG. 2 is a diagram showing an incineration ash roasting process according to a modification of the first embodiment of the present invention. In the process shown in FIG. 2, as in the process shown in FIG. 1, the incinerated ash that has been crushed to remove coarse substances is subjected to iron removal by an iron separator, and non-ferrous metal is removed by a non-ferrous separator. , FIG. 2
1 is the same as the process shown in FIG. 1 except that iron sorting and non-ferrous sorting steps are provided. Note that the iron sorting and non-ferrous sorting steps are not limited to before roasting, but can be performed after roasting.
【００２７】図３は、本発明の第１の形態の他の変形例
に係る焼却灰焙焼プロセスを示す図である。廃棄物を焼
却炉で焼却した際に発生する排ガスは、一般に排ガス処
理装置において処理されているが、図３に示すプロセス
では、焙焼炉の排ガスを焼却炉からの排ガスと一緒に処
理していることにおいて、図１に示すプロセスと異な
る。それ以外の工程は、すべて図１に示すプロセスと同
様である。FIG. 3 is a diagram showing an incineration ash roasting process according to another modification of the first embodiment of the present invention. Exhaust gas generated when waste is incinerated in an incinerator is generally treated in an exhaust gas treatment device, but in the process shown in FIG. 3, the exhaust gas from the roasting furnace is treated together with the exhaust gas from the incinerator. In that it differs from the process shown in FIG. All other steps are the same as the process shown in FIG.
【００２８】本発明の第２の実施形態は、焼却灰の焙焼
の際に、ベントナイトからなる添加剤を添加するもので
ある。図４は、本発明の第２の実施形態に係る焼却灰焙
焼プロセスを示す図である。図４において、焼却炉から
排出された焼却灰は、まず破砕機により平均サイズが５
ｍｍ〜３０ｍｍとなるように破砕され、次いで粗大物除
去装置によりサイズ３００以上の粗大物が除去される。In the second embodiment of the present invention, an additive consisting of bentonite is added during roasting of the incinerated ash. FIG. 4 is a diagram illustrating an incineration ash roasting process according to the second embodiment of the present invention. In FIG. 4, the incineration ash discharged from the incinerator has an average size of 5 mm by a crusher.
It is crushed so as to have a size of 30 mm to 30 mm, and then a coarse substance having a size of 300 or more is removed by a coarse substance removing device.
【００２９】粗大物が除去された焼却灰は、次に焼却灰
ホッパーに投入される。焼却灰ホッパーは焙焼装置に接
続されており、その経路の途中に添加剤ホッパーが配置
され、焼却灰にベントナイトを添加出来るようにされて
いる。ベントナイトは、焼却灰を覆う形で固溶化し、Ｃ
ｒの酸化反応により生成されたＣｒ６＋の溶出を防止す
るために添加されるものである。The incinerated ash from which the bulky matter has been removed is then introduced into an incinerated ash hopper. The incineration ash hopper is connected to a roasting device, and an additive hopper is arranged in the middle of the route, so that bentonite can be added to the incineration ash. Bentonite forms a solid solution over the incineration ash,
It is added to prevent elution of Cr 6+ generated by the oxidation reaction of r.
【００３０】ベントナイトの粒度は、特に限定されない
が、あまり細かすぎると飛散して取り扱いにくくなり、
粗過ぎると焼却灰中への均一な分布が困難となることか
ら、０．５ｍｍ〜５ｍｍ程度が適当である。The particle size of the bentonite is not particularly limited, but if it is too fine, it will scatter and become difficult to handle.
If it is too coarse, uniform distribution in the incineration ash becomes difficult, so that about 0.5 mm to 5 mm is appropriate.
【００３１】なお、焼却灰中に添加されるベントナイト
の量は、焼却灰重量の２〜５０重量％が望ましい。ベン
トナイトの添加量が２重量％未満では、Ｃｒ６＋の溶出
防止効果が不十分となり、一方、５０重量％を越えて
も、それ以上の効果は期待出来ないからである。The amount of bentonite added to the incineration ash is desirably 2 to 50% by weight based on the weight of the incineration ash. If the amount of bentonite is less than 2% by weight, the effect of preventing the elution of Cr 6+ becomes insufficient, and if it exceeds 50% by weight, no further effect can be expected.
【００３２】ベントナイトが添加された焼却灰は、次い
で、焙焼装置、例えばロータリーキルン内で焙焼され
る。焙焼温度は、焼却灰の融点より低い、５００〜１３
００℃が好ましい。このように高温での焙焼により、Ｐ
ｂ、Ｚｎ、Ｈｇ、Ａｓ等のＣｒ以外の重金属は揮散して
しまうので、焙焼後に、新たな重金属の除去策をとる必
要はない。また、ダイオキシン等の有害有機物質は、こ
のような高温下で分解され、無害化される。The incinerated ash to which bentonite has been added is then roasted in a roasting apparatus, for example, a rotary kiln. The roasting temperature is 500 to 13 lower than the melting point of the incinerated ash.
00 ° C is preferred. By roasting at such a high temperature, P
Since heavy metals other than Cr, such as b, Zn, Hg, and As, volatilize, it is not necessary to take new heavy metal removal measures after roasting. In addition, harmful organic substances such as dioxin are decomposed at such high temperatures and made harmless.
【００３３】なお、焙焼温度が５００℃未満では、Ｐ
ｂ、Ｚｎ、Ｈｇ、Ａｓ、Ｓｅ等のＣｒ以外の重金属の揮
散が不十分となり、これら重金属は焼却灰中に残留し、
焼却灰の再利用を妨げてしまう。一方、焙焼温度が１３
００℃を越えても、それ以上の効果は得られず、エネル
ギーの損失となってしまう。When the roasting temperature is lower than 500 ° C., P
The volatilization of heavy metals other than Cr such as b, Zn, Hg, As, and Se becomes insufficient, and these heavy metals remain in the incineration ash,
This prevents reuse of incinerated ash. On the other hand, when the roasting temperature is 13
If the temperature exceeds 00 ° C., no further effect can be obtained, resulting in energy loss.
【００３４】焙焼炉の熱源は、灯油、重油、ＲＤＦ等、
各種の燃料を使用することが出来る。加熱方式は、直接
バーナーで加熱する方法、別途熱風を生成し、焙焼炉内
に送り込む方法等がある。The heat source of the roasting furnace is kerosene, heavy oil, RDF, etc.
Various fuels can be used. As a heating method, there is a method of directly heating with a burner, a method of separately generating hot air, and sending it into a roasting furnace.
【００３５】焙焼装置内で焙焼された後の焼却灰は、篩
にかけられて、焼結等により粗大化したものが除かれ、
回収される。焙焼装置からの排ガスは、排ガス処理装置
により処理された後、大気中に放出される。図５は、本
発明の第２の形態の変形例に係る焼却灰焙焼プロセスを
示す図である。図５に示すプロセスでは、図４に示すプ
ロセスと同様、破砕し、粗大物を除去した焼却灰を、鉄
選別機により鉄分を除去し、非鉄選別機により非鉄金属
分を除去しており、即ち、図５に示すプロセスは、鉄選
別よび非鉄選別工程を設けた以外は、図４に示すプロセ
スと同様である。なお、鉄選別よび非鉄選別工程は、焙
焼前に限らず、焙焼後に行うことも可能である。The incinerated ash that has been roasted in the roasting apparatus is sieved to remove coarsened sinter and the like.
Collected. The exhaust gas from the roasting device is released into the atmosphere after being processed by the exhaust gas treatment device. FIG. 5 is a diagram showing an incineration ash roasting process according to a modification of the second embodiment of the present invention. In the process shown in FIG. 5, as in the process shown in FIG. 4, the incinerated ash obtained by crushing and removing coarse substances is subjected to iron removal by an iron separator, and non-ferrous metal is removed by a non-ferrous separator. The process shown in FIG. 5 is the same as the process shown in FIG. 4 except that iron sorting and non-ferrous sorting steps are provided. Note that the iron sorting and non-ferrous sorting steps are not limited to being performed before roasting, and can be performed after roasting.
【００３６】図６は、本発明の第２の形態の他の変形例
に係る焼却灰焙焼プロセスを示す図である。廃棄物を焼
却炉で焼却した際に発生する排ガスは、一般に排ガス処
理装置において処理されているが、図６に示すプロセス
では、焙焼炉の排ガスを焼却炉からの排ガスと一緒に処
理していることにおいて、図４に示すプロセスと異な
る。それ以外の工程は、すべて図４に示すプロセスと同
様である。FIG. 6 is a view showing an incineration ash roasting process according to another modification of the second embodiment of the present invention. Exhaust gas generated when waste is incinerated in an incinerator is generally treated in an exhaust gas treatment device. In the process shown in FIG. 6, exhaust gas from a roasting furnace is treated together with exhaust gas from an incinerator. In that it differs from the process shown in FIG. All other steps are the same as the process shown in FIG.
【００３７】[0037]
【発明の効果】以上、詳細に説明したように、本発明の
焼却灰の資源化方法によると、焼却灰に還元剤および／
またはベントナイトを添加し、次いで低沸点重金属を揮
散させるに十分な温度で焙焼することにより、沸点の低
い重金属を揮散させるとともに、沸点の高いＣｒについ
ては、還元剤の添加によりその酸化を防止し、および／
またはベントナイトの添加によりＣｒ６＋の溶出を防止
することが出来、それによって、重金属やダイオキシン
等の有害物質を含まない、無害な焼却灰を資源として得
ることが出来る。As described above, according to the method for recycling incinerated ash of the present invention, a reducing agent and / or
Alternatively, by adding bentonite and then roasting at a temperature sufficient to volatilize low-boiling heavy metals, heavy metals with low boiling points are volatilized, and for high-boiling Cr, the oxidation is prevented by adding a reducing agent. ,and/
Alternatively , Cr 6+ elution can be prevented by the addition of bentonite, whereby harmless incinerated ash that does not contain harmful substances such as heavy metals and dioxins can be obtained as a resource.
【図１】本発明の第１の実施形態に係る焼却灰焙焼プロ
セスを示す図。FIG. 1 is a diagram showing an incineration ash roasting process according to a first embodiment of the present invention.
【図２】本発明の第１の実施形態に係る焼却灰焙焼プロ
セスの変形例を示す図。FIG. 2 is a view showing a modification of the incineration ash roasting process according to the first embodiment of the present invention.
【図３】本発明の第１の実施形態に係る焼却灰焙焼プロ
セスの他の変形例を示す図。FIG. 3 is a view showing another modification of the incineration ash roasting process according to the first embodiment of the present invention.
【図４】本発明の第２の実施形態に係る焼却灰焙焼プロ
セスを示す図。FIG. 4 is a diagram showing an incineration ash roasting process according to a second embodiment of the present invention.
【図５】本発明の第２の実施形態に係る焼却灰焙焼プロ
セスの変形例を示す図。FIG. 5 is a view showing a modification of the incineration ash roasting process according to the second embodiment of the present invention.
【図６】本発明の第２の実施形態に係る焼却灰焙焼プロ
セスの他の変形例を示す図。FIG. 6 is a view showing another modified example of the incineration ash roasting process according to the second embodiment of the present invention.
【図７】従来の焼却灰焙焼プロセスを示す図。FIG. 7 is a view showing a conventional incineration ash roasting process.
【図８】従来の焼却灰焙焼プロセスの他の例を示す図。FIG. 8 is a diagram showing another example of a conventional incineration ash roasting process.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 奥野 敏 神奈川県横浜市中区錦町12番地 三菱重工 業株式会社横浜製作所内 (72)発明者 山本 洋民 神奈川県横浜市中区錦町12番地 三菱重工 業株式会社横浜製作所内 Ｆターム(参考） 4D004 AA36 AB03 BA02 BA05 CA08 CA09 CA30 CA37 CC11 DA02 DA03 DA06 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoshi Okuno 12 Nishiki-cho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Inside Mitsubishi Heavy Industries, Ltd. F-term (reference) in Yokohama Works 4D004 AA36 AB03 BA02 BA05 CA08 CA09 CA30 CA37 CC11 DA02 DA03 DA06
Claims (10)
添加された焼却灰を、焼却灰の融点以下で、かつ低沸点
重金属を揮散させるに十分な温度で焙焼する工程、およ
び焙焼された焼却灰を資源として回収する工程を具備す
ることを特徴とする焼却灰の資源化方法。A step of adding a reducing agent to the incinerated ash; a step of roasting the incinerated ash to which the reducing agent has been added at a temperature below the melting point of the incinerated ash and at a temperature sufficient to volatilize low-boiling heavy metals. A method for recycling incinerated ash, comprising a step of collecting roasted incinerated ash as a resource.
灰から鉄分を除去し、回収することを特徴とする請求項
１に記載の焼却灰の資源化方法。2. The method for recycling incinerated ash according to claim 1, wherein iron is removed from the incinerated ash before or after roasting the incinerated ash.
灰から非鉄金属を除去し、回収することを特徴とする請
求項１または２に記載の焼却灰の資源化方法。3. The method for recycling incinerated ash according to claim 1, wherein the non-ferrous metal is removed from the incinerated ash before or after roasting the incinerated ash.
廃棄物の焼却により生じた排ガスと一緒に処理すること
を特徴とする請求項１〜３のいずれかの項に記載の焼却
灰の資源化方法。4. An exhaust gas generated by roasting the incinerated ash,
The method for recycling incinerated ash according to any one of claims 1 to 3, wherein the incinerated ash is treated together with exhaust gas generated by incineration of waste.
ントナイトが添加された焼却灰を、焼却灰の融点以下
で、かつ低沸点重金属を揮散させるに十分な温度で焙焼
する工程、および焙焼された焼却灰を資源として回収す
る工程を具備することを特徴とする焼却灰の資源化方
法。5. A step of adding bentonite to the incinerated ash, a step of roasting the incinerated ash to which the bentonite is added at a temperature lower than the melting point of the incinerated ash and at a temperature sufficient to volatilize low-boiling heavy metals, and roasting. A method for recycling incinerated ash, comprising a step of recovering the incinerated ash as a resource.
灰から鉄分を除去し、回収することを特徴とする請求項
５に記載の焼却灰の資源化方法。6. The method according to claim 5, wherein iron is removed from the incinerated ash before or after the incinerated ash is roasted and recovered.
灰から非鉄金属を除去し、回収することを特徴とする請
求項５または６に記載の焼却灰の資源化方法。7. The method for recycling incinerated ash according to claim 5, wherein the non-ferrous metal is removed from the incinerated ash before or after roasting the incinerated ash.
廃棄物の焼却により生じた排ガスと一緒に処理すること
を特徴とする請求項５〜７のいずれかの項に記載の焼却
灰の資源化方法。8. An exhaust gas generated by roasting the incinerated ash,
The incineration ash recycling method according to any one of claims 5 to 7, wherein the incineration ash is treated together with exhaust gas generated by incineration of waste.
Ｃｄ、ＳｅおよびＡｓからなる群から選ばれた少なくと
も１種であることを特徴とする請求項５〜８のいずれか
の項に記載の焼却灰の資源化方法。9. The low-boiling heavy metal includes Pb, Zn, Hg,
The method for recycling incinerated ash according to any one of claims 5 to 8, wherein the method is at least one selected from the group consisting of Cd, Se, and As.
温度は、５００〜１３００℃であることを特徴とする請
求項５〜９のいずれかの項に記載の焼却灰の資源化方
法。10. The method for recycling incinerated ash according to claim 5, wherein a temperature sufficient to volatilize said low-boiling heavy metal is 500 to 1300 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08843199A JP3917775B2 (en) | 1999-03-30 | 1999-03-30 | Recycling method of incineration ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08843199A JP3917775B2 (en) | 1999-03-30 | 1999-03-30 | Recycling method of incineration ash |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000279919A true JP2000279919A (en) | 2000-10-10 |
| JP3917775B2 JP3917775B2 (en) | 2007-05-23 |
Family
ID=13942611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08843199A Expired - Fee Related JP3917775B2 (en) | 1999-03-30 | 1999-03-30 | Recycling method of incineration ash |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3917775B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009041897A (en) * | 2007-07-19 | 2009-02-26 | Mhi Environment Engineering Co Ltd | Roasting facility juxtaposed to incinerator |
| JP2016523790A (en) * | 2013-05-03 | 2016-08-12 | オウトテック （フィンランド） オサケ ユキチュアＯｕｔｏｔｅｃ （Ｆｉｎｌａｎｄ） Ｏｙ | Method and plant for separating heavy metals from phosphorus starting materials |
-
1999
- 1999-03-30 JP JP08843199A patent/JP3917775B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009041897A (en) * | 2007-07-19 | 2009-02-26 | Mhi Environment Engineering Co Ltd | Roasting facility juxtaposed to incinerator |
| JP2016523790A (en) * | 2013-05-03 | 2016-08-12 | オウトテック （フィンランド） オサケ ユキチュアＯｕｔｏｔｅｃ （Ｆｉｎｌａｎｄ） Ｏｙ | Method and plant for separating heavy metals from phosphorus starting materials |
| US10081545B2 (en) | 2013-05-03 | 2018-09-25 | Outotec (Finland) Oy | Process and plant for separating heavy metals from phosphoric starting material |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3917775B2 (en) | 2007-05-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO1997017573A1 (en) | Method and apparatus for waste treatment | |
| JP2020077625A (en) | Treatment method of coated wire | |
| JP3856711B2 (en) | Method and apparatus for recycling inorganic waste containing inorganic chemical components that can be reused as ceramic raw materials | |
| JP4686227B2 (en) | Treatment method of sulfuric acid pitch | |
| JP2000279919A (en) | Method of recycling incineration ash | |
| JP2001132930A (en) | Method and device for changing incineration ash to resource | |
| JP5583360B2 (en) | Purification equipment for contaminated soil | |
| JP2006207909A (en) | Waste and contaminant recycling device and method | |
| JPH10156313A (en) | Treatment of waste containing heavy metal and chlorine and device therefor | |
| JP2004323255A (en) | Method and system for converting soil to cement raw material | |
| JPH09122617A (en) | Treatment method for shredder dust of large-sized industrial waste | |
| JP3957232B2 (en) | Pretreatment equipment for reusing municipal waste incineration ash | |
| JP2003212618A (en) | Method for treating organic contaminated soil | |
| JP2000282154A (en) | Method for recovering metal from fused slag of waste material | |
| JP2002102835A (en) | Method and apparatus for treating dust produced from waste incineration | |
| JP3893266B2 (en) | Detoxification / recycling method and apparatus of incineration residue in waste incineration process | |
| JP4068356B2 (en) | Incineration residue treatment equipment | |
| JP2000246232A (en) | Method for making contaminated soil harmless and method for making contaminated soil harmless and utilizing it | |
| JP6731811B2 (en) | Slurry heat treatment method and melting apparatus | |
| JP2007154236A (en) | Method for separating lead from combustion ash | |
| JP2002119820A (en) | Waste incineration waste gas and treatment method for dust | |
| JP2010247047A (en) | Method and apparatus for purifying polluted soil | |
| JP4008430B2 (en) | Processing system and method for improving combustion residue characteristics | |
| JP2002119945A (en) | Method for treating waste incineration exhaust gas and dust | |
| JP3849961B2 (en) | Thermal decomposition melting treatment method of waste |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20050513 |
|
| RD03 | Notification of appointment of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7423 Effective date: 20060130 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A821 Effective date: 20060130 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20060608 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20060620 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20060818 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20060919 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20070123 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20070209 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 3917775 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100216 Year of fee payment: 3 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313115 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100216 Year of fee payment: 3 |
|
| R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100216 Year of fee payment: 3 |
|
| R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
| R371 | Transfer withdrawn |
Free format text: JAPANESE INTERMEDIATE CODE: R371 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100216 Year of fee payment: 3 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313115 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100216 Year of fee payment: 3 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100216 Year of fee payment: 3 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110216 Year of fee payment: 4 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110216 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120216 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120216 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130216 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140216 Year of fee payment: 7 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |