JP3112764B2 - Melting method of incinerated ash - Google Patents
Melting method of incinerated ashInfo
- Publication number
- JP3112764B2 JP3112764B2 JP05049186A JP4918693A JP3112764B2 JP 3112764 B2 JP3112764 B2 JP 3112764B2 JP 05049186 A JP05049186 A JP 05049186A JP 4918693 A JP4918693 A JP 4918693A JP 3112764 B2 JP3112764 B2 JP 3112764B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- incinerated ash
- parts
- melting
- ash
- 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.)
- Expired - Lifetime
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- Processing Of Solid Wastes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、下水汚泥焼却灰や都市
ごみ焼却灰等の溶融処理方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for melting ash from sewage sludge or municipal solid waste.
【０００２】[0002]
【従来の技術】上記のような焼却灰の減容処理方法とし
て、焼却灰を抵抗式電気炉（サブマージドアーク炉等）
やガス燃焼炉、オイル燃焼炉等によって溶融処理し、ガ
ラス化する方法が知られている。このような従来の溶融
処理は、焼却灰を完全に溶融するために1400〜1500℃の
高温で行われるのが普通であった。ところが、このよう
な高温溶融を行うと炉を構成する耐火物の損傷が激しい
という問題があった。また焼却灰中に含有されているC
d、Pb、Crのような重金属が揮散しやすいという問題も
あった。2. Description of the Related Art As a method for reducing the volume of incinerated ash as described above, incinerated ash is converted into a resistance type electric furnace (such as a submerged arc furnace).
There is known a method of melting and vitrifying with a gas combustion furnace, an oil combustion furnace, or the like. Such a conventional melting treatment is usually performed at a high temperature of 1400 to 1500 ° C. in order to completely melt the incinerated ash. However, there has been a problem that when such high-temperature melting is performed, refractories constituting the furnace are severely damaged. C contained in incineration ash
There was also a problem that heavy metals such as d, Pb, and Cr were easily volatilized.
【０００３】[0003]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決して、炉の耐火物の損傷や、焼却灰中に
含有されている重金属の揮散を抑制しつつ焼却灰を溶融
処理する方法を提供するためになされたものである。SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and melts incinerated ash while suppressing damage to the refractory of the furnace and volatilization of heavy metals contained in the incinerated ash. It has been done to provide a way to process.
【０００４】[0004]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明の焼却灰の溶融処理方法は、焼却灰
100 重量部に対して、10〜30重量部のNa2CO3と、５〜20
重量部のNaNO3 とを添加して溶融することを特徴とする
ものである。なおこの混合物に対して、更にガラス化安
定剤としてのSiO2を添加することが好ましい。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a method for melting incinerated ash according to the present invention is disclosed.
For 100 parts by weight, 10 to 30 parts by weight of Na 2 CO 3 and 5 to 20 parts by weight
It is characterized by adding and melting parts by weight of NaNO 3 . It is preferable to further add SiO 2 as a vitrification stabilizer to this mixture.
【０００５】本発明において使用されるNa2CO3は融点が
851 ℃であり、またNaNO3 は融点が308 ℃であり、焼却
灰と比較してはるかに低温で溶融塩となる。このために
これらを焼却灰に上記した比率で焼却灰中に混合する
と、混合物は800 ℃程度で溶融し完全にガラス化する。
従って、本発明によれば焼却灰の溶融処理の温度を従来
の1400〜1500℃から800 ℃程度まで大幅に低下させるこ
とが可能となり、炉の耐火物の損傷を防止することが可
能となる。また、Na2CO3の溶融塩とNaNO3 の溶融塩とは
重金属の溶解性に選択性があり、これらを両方添加する
ことによって、焼却灰中に含有されている重金属のほと
んどを捕捉してガラス中に取込み、ガス側への揮散を抑
制することができる。[0005] Na 2 CO 3 used in the present invention has a melting point.
It has a melting point of 851 ° C and NaNO 3 has a melting point of 308 ° C, and becomes a molten salt at a much lower temperature than incineration ash. For this reason, when these are mixed with the incinerated ash in the above ratio in the incinerated ash, the mixture melts at about 800 ° C. and is completely vitrified.
Therefore, according to the present invention, it is possible to drastically reduce the temperature of the incineration ash melting treatment from the conventional 1400 to 1500 ° C. to about 800 ° C., thereby preventing damage to the refractory of the furnace. In addition, the molten salt of Na 2 CO 3 and the molten salt of NaNO 3 have selectivity in the solubility of heavy metals, and by adding both of them, most of the heavy metals contained in the incineration ash are captured. It can be taken into the glass to suppress volatilization to the gas side.
【０００６】なお、本発明においてNa2CO3の添加量を焼
却灰100 重量部に対して10〜30重量部としたのは、これ
よりも添加量が少ないと上記した効果が不十分となり、
逆にこの範囲を越えて添加しても効果の増加がなく、不
経済となるためである。またNaNO3 の添加量を５〜20重
量部としたのも、同様の理由による。In the present invention, the amount of Na 2 CO 3 added is set to 10 to 30 parts by weight with respect to 100 parts by weight of incinerated ash.
Conversely, if added beyond this range, there is no increase in the effect, which is uneconomical. Also, the addition amount of NaNO 3 is set to 5 to 20 parts by weight for the same reason.
【０００７】さらにガラスの網目形成剤であるSiO2を添
加することにより、ガラス化を安定化することができ
る。SiO2の量は特に限定されるものではなく、多量に添
加するとより安定なガラスが得られるが、次第に融点が
上昇することと不経済であることから、焼却灰100 重量
部に対して10〜100 重量部程度が適当である。このよう
なSiO2の添加により得られる安定なガラスは、重金属を
安定に閉じ込めるうえで有利である。Na2CO3源として
は、例えば加熱によってNa2CO3となるNaHCO3を用いても
良く、SiO2源としては水ガラス等を用いれば溶解が容易
に進行する。Further, vitrification can be stabilized by adding SiO 2 which is a glass network forming agent. The amount of SiO 2 is not particularly limited, and a more stable glass can be obtained by adding a large amount, but since the melting point gradually increases and it is uneconomical, 10 to 10 parts by weight of incinerated ash is required. About 100 parts by weight is appropriate. Such a stable glass obtained by adding SiO 2 is advantageous for stably confining heavy metals. As the Na 2 CO 3 source, for example, NaHCO 3 which becomes Na 2 CO 3 by heating may be used, and if water glass or the like is used as the SiO 2 source, the dissolution proceeds easily.
【０００８】[0008]
【実施例】以下に本発明を実施例により更に詳細に説明
する。１kg中にCdを190mg 、Pbを4900mg、Cr（トータル
−クロム）を4900mg含有する下水汚泥の焼却灰の100 重
量部に対して、Na2CO3を20重量部、NaNO3 を10重量部添
加し、更にSiO2を30重量部添加した。これをサブマージ
ドアーク炉により800〜900℃で溶融した。The present invention will be described in more detail with reference to the following examples. 20 parts by weight of Na 2 CO 3 and 10 parts by weight of NaNO 3 are added to 100 parts by weight of sewage sludge incineration ash containing 190 mg of Cd, 4900 mg of Pb, and 4900 mg of Cr (total chromium) in 1 kg. Then, 30 parts by weight of SiO 2 was further added. This was melted at 800-900 ° C in a submerged arc furnace.
【０００９】得られたガラスを冷却固化して組成分析を
行った結果、ガラス１kg中のCd量は160mg 、Pbは4750m
g、Cr（トータル−クロム）は4800mgであった。またガ
ラス中からのこれらの各成分の溶出試験を行ったが、い
ずれも検出限界以下であり、重金属が安定にガラス中に
封じ込められたことが分かる。The obtained glass was cooled and solidified, and the composition was analyzed. As a result, the amount of Cd in 1 kg of glass was 160 mg, and that of Pb was 4750 m.
g and Cr (total-chromium) were 4800 mg. In addition, a dissolution test of each of these components from the glass was performed. The results were all below the detection limit, indicating that the heavy metal was stably encapsulated in the glass.
【００１０】[0010]
【発明の効果】以上に説明したように、本発明の焼却灰
の溶融処理方法によれば、焼却灰に対してNa2CO3とNaNO
3 とを添加して溶融することにより、溶融温度を従来よ
りも数100 ℃も低下させることができ、炉の耐火物の損
傷を防止することができる。また焼却灰中に含有される
重金属の揮散を防止し、各種の重金属を安定にガラス中
に封じ込めることができる。さらにSiO2の添加により、
より安定なガラスを得ることができる。よって本発明は
従来の問題点を解消した焼却灰の溶融処理方法として、
産業の発展に寄与するところはきわめて大きいものであ
る。As described above, according to the incineration ash melting method of the present invention, Na 2 CO 3 and NaNO 3
By adding 3 and melting, the melting temperature can be lowered by several hundred degrees centigrade as compared with the conventional method, and damage to the refractory of the furnace can be prevented. Further, volatilization of heavy metals contained in the incineration ash can be prevented, and various heavy metals can be stably contained in the glass. The further addition of SiO 2,
More stable glass can be obtained. Therefore, the present invention is a method of melting incineration ash that has solved the conventional problems,
The contribution to industrial development is very large.
Claims (2)
部のNa2CO3と、５〜20重量部のNaNO3 とを添加して溶融
することを特徴とする焼却灰の溶融処理方法。1. Melting of incinerated ash, wherein 10 to 30 parts by weight of Na 2 CO 3 and 5 to 20 parts by weight of NaNO 3 are added to 100 parts by weight of incinerated ash and melted. Processing method.
剤としてSiO2を添加することを特徴とする請求項１記載
の焼却灰の溶融処理方法。2. The method according to claim 1, wherein SiO 2 is further added to the mixture as a vitrification stabilizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05049186A JP3112764B2 (en) | 1993-03-10 | 1993-03-10 | Melting method of incinerated ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05049186A JP3112764B2 (en) | 1993-03-10 | 1993-03-10 | Melting method of incinerated ash |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06262162A JPH06262162A (en) | 1994-09-20 |
| JP3112764B2 true JP3112764B2 (en) | 2000-11-27 |
Family
ID=12824007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05049186A Expired - Lifetime JP3112764B2 (en) | 1993-03-10 | 1993-03-10 | Melting method of incinerated ash |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3112764B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR970069157A (en) * | 1996-04-30 | 1997-11-07 | 이대원 | Stabilization Method of Municipal Waste Incineration Ash using Waste Desulfurization Slag |
-
1993
- 1993-03-10 JP JP05049186A patent/JP3112764B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06262162A (en) | 1994-09-20 |
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