JP3247347B2 - Exhaust gas treatment method - Google Patents
Exhaust gas treatment methodInfo
- Publication number
- JP3247347B2 JP3247347B2 JP27865698A JP27865698A JP3247347B2 JP 3247347 B2 JP3247347 B2 JP 3247347B2 JP 27865698 A JP27865698 A JP 27865698A JP 27865698 A JP27865698 A JP 27865698A JP 3247347 B2 JP3247347 B2 JP 3247347B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- treatment method
- gas treatment
- fluorine
- cleaning liquid
- 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 - Fee Related
Links
- 238000000034 method Methods 0.000 title claims description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 238000004140 cleaning Methods 0.000 claims description 23
- 239000011737 fluorine Substances 0.000 claims description 14
- 229910052731 fluorine Inorganic materials 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 13
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 9
- 239000000460 chlorine Substances 0.000 claims description 8
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 7
- 229910052801 chlorine Inorganic materials 0.000 claims description 7
- 229910001424 calcium ion Inorganic materials 0.000 claims description 5
- 239000001569 carbon dioxide Substances 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 239000002440 industrial waste Substances 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims 1
- 239000000243 solution Substances 0.000 description 20
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 13
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 238000006386 neutralization reaction Methods 0.000 description 7
- 239000002244 precipitate Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000012085 test solution Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 229910004261 CaF 2 Inorganic materials 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000011790 ferrous sulphate Substances 0.000 description 2
- 235000003891 ferrous sulphate Nutrition 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000012716 precipitator Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- -1 FeSO 4 can be added Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
-
- 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
- Y02W30/20—Waste processing or separation
Landscapes
- Treating Waste Gases (AREA)
- Processing Of Solid Wastes (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は排ガス処理方法に関
するものであり、さらに詳しく述べるならば、産業廃棄
物の焼却により発生する、塩素、フッ素及び炭酸ガス含
有排ガスを処理する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 treating exhaust gas, and more particularly to a method for treating an exhaust gas containing chlorine, fluorine and carbon dioxide generated by incineration of industrial waste.
【０００２】[0002]
【従来の技術】各種産業廃棄物を高温の焼却炉で焼却し
て、焼却灰を溶融してスラグ化してリサイクルする方法
は工業的に実施されている（「資源と素材」1997. Vol.
113,No.12 「リサイクル大特集号」1175- 1180頁参
照）。この焼却排ガスは乾式電気集塵機、中和塔、湿式
電気集塵機などで処理される（第１１８０頁）。中和塔
で、排ガス中に含有される高濃度の塩素を中和すること
により、後処理装置の腐食を防止し、かつ中和殿物とし
てＦなどを無害な形態に転換している。2. Description of the Related Art A method of incinerating various kinds of industrial waste in a high-temperature incinerator, melting the incinerated ash, converting it into slag, and recycling it is industrially implemented ("Resources and Materials", 1997. Vol.
113, No. 12, "Special Issue on Recycling", pages 1175 to 1180). This incineration exhaust gas is treated by a dry electric precipitator, a neutralization tower, a wet electric precipitator and the like (page 1180). The neutralization tower neutralizes high-concentration chlorine contained in the exhaust gas, thereby preventing the post-treatment device from corroding and converting F and the like into a harmless form as a neutralized residue.
【０００３】[0003]
【発明が解決しようとする課題】従来法の中和による排
ガス処理では、炭酸塩、フッ化物の混合物が回収される
が、この回収法では殿物の量が多くなる。さらに、現状
の洗浄液はＣＯ3 濃度が高いために、Ｆを回収除去しよ
うとしてＣａ（ＯＨ）2 を添加してもＣａＣＯ3 が下記
反応により沈殿するためにＦの回収が困難であった。こ
のために廃液中にＦ濃度が高いので、さらに環境対策上
別途処理をしなければならないという問題があった。 Ｃａ（ＯＨ）2 ＋ＣＯ2 ＝ＣａＣＯ3 ＋Ｈ2 Ｏ・・・・・・・（１） 本発明者はこれらの問題点の解決につき鋭意研究した結
果、このようにＣＯ3濃度が高いのは、洗浄液中に多量
のＮａＯＨを添加しているためにｐＨが高くなり、排ガ
ス中のＣＯ2 を多量に吸収するためとの結論に達した。
したがって、本発明は、塩素、フッ素及び炭酸ガスを含
有する排ガスの処理法においてフッ素を殿物として除去
し、かつ殿物量が少なくなる方法を提供することを目的
とする。In the exhaust gas treatment by neutralization in the conventional method, a mixture of carbonate and fluoride is recovered. However, in this recovery method, the amount of by-products increases. Further, since the current cleaning solution has a high CO 3 concentration, even if Ca (OH) 2 is added to recover and remove F, it is difficult to recover F because CaCO 3 precipitates by the following reaction. For this reason, there is a problem that since the F concentration is high in the waste liquid, a separate treatment must be performed for environmental measures. Ca (OH) 2 + CO 2 = CaCO 3 + H 2 O (1) As a result of intensive studies on solving these problems, the present inventors have found that the high CO 3 concentration is as follows. pH is increased because of the addition of large amount of NaOH in the cleaning liquid, it reached the conclusion that for a large amount absorbed CO 2 in the exhaust gas.
Therefore, an object of the present invention is to provide a method for removing fluorine as a residue and reducing the amount of the residue in a method for treating an exhaust gas containing chlorine, fluorine and carbon dioxide gas.
【０００４】[0004]
【課題が解決するための手段】本発明に係る方法は、塩
素、フッ素及び炭酸ガスを含有する排ガスをアルカリ洗
浄する排ガス処理法において、ｐＨ８以下に調整した洗
浄液の一部である第１の洗浄液をアルカリ洗浄に繰返し
使用し、残部である第２の洗浄液のｐＨを２〜６に保持
して液中のＣＯ2 を気化除去し、次いでＣＯ2 除去後ｐ
Ｈ＝１０〜１１．５に保持された第３の洗浄液とＣａイ
オンを接触させることにより液中のＦを沈殿させること
を特徴とする方法である。以下本発明を詳しく説明す
る。According to the present invention, there is provided a method for treating an exhaust gas containing chlorine, fluorine and carbon dioxide gas with an alkaline gas, wherein the first cleaning solution is a part of a cleaning solution adjusted to pH 8 or less. Is repeatedly used for alkaline washing, the pH of the remaining second washing solution is kept at 2 to 6 to vaporize and remove CO 2 in the solution, and then p is removed after CO 2 is removed.
This method is characterized in that F in the solution is precipitated by contacting Ca ions with a third cleaning solution maintained at H = 10 to 11.5. Hereinafter, the present invention will be described in detail.
【０００５】本発明の処理対象とする排ガスは、産業廃
棄物を焼却することにより発生する塩素、フッ素及び炭
酸ガスを含有する排ガスであってＮａＯＨなどによりア
ルカリ水溶液により洗浄された洗浄液である。これらの
排ガス成分の濃度は特に限定されないが、全塩素が１〜
１０ｇ／Ｌ，全フッ素が０．１〜２ｇ／Ｌ，全炭酸が１
０〜５０ｇ／Ｌの濃度が一般的である。上記した洗浄に
より、 ＮａＯＨ＋ＨＣｌ＝ＮａＣｌ＋Ｈ2Ｏ・・・・・・・・・・・・（２） ＮａＯＨ＋ＣＯ2＝ＮａＨＣＯ3 ・・・・・・・・・・・・・・・・（３） の反応が起こり、ｐＨは従来法では８〜１０と高くなっ
ていた。本発明においては、洗浄液のｐＨを８以下に保
つことによりＣＯ2の吸収を抑制し、この洗浄液の一部
（第２の洗浄液）につき以下のフッ素回収処理を施すと
ともに、残部（第１の洗浄液）については洗浄液として
繰り返し再使用する。ｐＨ８以下に保持する方法として
は洗浄におけるＮａＯＨ使用量を従来より少なくする。The exhaust gas to be treated according to the present invention is an exhaust gas containing chlorine, fluorine and carbon dioxide gas generated by incineration of industrial waste, and is a cleaning solution which has been washed with an alkaline aqueous solution using NaOH or the like. The concentration of these exhaust gas components is not particularly limited, but total chlorine is 1 to
10g / L, total fluorine is 0.1~2g / L, the total coal acid 1
Concentrations of 0 to 50 g / L are common. By the above-mentioned washing, NaOH + HCl = NaCl + H 2 O (2) NaOH + CO 2 = NaHCO 3 (3) A reaction occurred, and the pH had increased to 8 to 10 in the conventional method. In the present invention, the absorption of CO 2 is suppressed by maintaining the pH of the cleaning solution at 8 or less, and a portion (the second cleaning solution) of the cleaning solution is subjected to the following fluorine recovery treatment, and the remainder (the first cleaning solution) is performed. About ()), it is reused repeatedly as a washing solution. As a method of maintaining the pH at 8 or less, the amount of NaOH used in the washing is made smaller than before.
【０００６】このようにｐＨを調整した（第２の）洗浄
液からＣＯ2 を気化させるために、ｐＨ＝２〜６に保持
する。ｐＨを８以下に中和した洗浄液に鉱酸を添加して
実験して得た中和曲線では次の二つの中和点があると考
えられた。 第１中和点（ｐＨ＝約８） ２Ｎａ2 ＣＯ3 ＋Ｈ2 ＳＯ4 ＝２ＮａＨＣＯ3 ＋Ｎａ2 ＳＯ4 ・・（４） 第２中和点（ｐＨ＝約５） ２ＮａＨＣＯ3 ＋Ｈ2 ＳＯ4 ＝Ｎａ2 ＳＯ4 ＋２Ｈ2 Ｏ＋２ＣＯ2 ↑ ・・・・・・・・・（５） したがって、ｐＨ＝２〜６となるように鉱酸を添加する
ことにより、フッ素の除去に必要なＣａの消耗を招くＣ
Ｏ2 ガスを駆逐することができる。ＦｅＳＯ4等の塩類
は添加することができるが、鉄が沈でんするため殿物量
が多くなる。反応式は以下のとおりである。 ２ＮａＨＣＯ3 ＋ＦｅＳＯ4 ＝Ｆｅ（ＯＨ）2 ＋Ｎａ2 ＳＯ4 ＋２ＣＯ2 ↑ ・・・・・・・・（６）[0006] To thus to adjust the pH (of a second) is vaporized CO 2 from the cleaning solution, maintained at pH = 2 to 6. A neutralization curve obtained by conducting an experiment by adding a mineral acid to a washing solution neutralized to a pH of 8 or less was considered to have the following two neutralization points. First neutralization point (pH = about 8) 2Na 2 CO 3 + H 2 SO 4 = 2NaHCO 3 + Na 2 SO 4 ... (4) Second neutralization point (pH = about 5) 2NaHCO 3 + H 2 SO 4 = Na 2 SO 4 + 2H 2 O + 2CO 2・ ・ ・ (5) Therefore, by adding a mineral acid so as to have a pH of 2 to 6, Ca required for removing fluorine is consumed. C
O 2 gas can be expelled. Salts such as FeSO 4 can be added, but iron precipitates and the amount of deposits increases. The reaction formula is as follows. 2NaHCO 3 + FeSO 4 = Fe (OH) 2 + Na 2 SO 4 + 2CO 2 (6)
【０００７】続いて、フッ素を除去するために、ＣＯ2
を除去した（第３の）洗浄液のｐＨを１０〜１１．５に
調整してＣａイオンと（第３の）洗浄液を接触させる。
Ｃａイオンとしては一般的には、Ｃａ（ＯＨ）2 を使用
するが、ＣａＯ、石こうなども使用することもできる。
Ｃａ（ＯＨ）2 を添加することにより次式によりフッ素
が沈殿する。 Ｃａ（ＯＨ）2 ＋２ＨＦ＝ＣａＦ2 ↓＋２Ｈ2 Ｏ・・・・・・・・・（７） その後処理液を濾過すると、得られる残渣（殿物）はＦ
の大部分を含む。またろ液は微量のＦイオンを含有し、
またＮａＣｌ，Ｎａ2 ＳＯ4 を含有する最終処理液が得
られる。Subsequently, CO 2 is removed to remove fluorine.
The pH of the (third) cleaning solution from which the is removed is adjusted to 10 to 11.5, and Ca ions are brought into contact with the (third) cleaning solution.
Generally, Ca (OH) 2 is used as Ca ions, but CaO, gypsum and the like can also be used.
By adding Ca (OH) 2 , fluorine precipitates according to the following formula. Ca (OH) 2 + 2HF = CaF 2 ↓ + 2H 2 O (7) After that, when the treatment liquid is filtered, the obtained residue (product) is F
Including most of The filtrate contains a small amount of F ions,
In addition, a final treatment liquid containing NaCl and Na 2 SO 4 is obtained.
【０００８】[0008]
【作用】以上説明したように、洗浄液のｐＨを８以下に
保持することにより、ＮａＯＨの使用量が激減する。ま
たフッ素除去を妨げるＣＯ2を気化除去した洗浄液にＣ
ａ（ＯＨ）2を添加するとフッ素はＣａＦ2として沈殿す
る。またＣＯ2は気化除去するので殿物の量が激減す
る。以下、実施例によりさらに詳しく本発明を説明す
る。As described above, by maintaining the pH of the cleaning solution at 8 or less, the amount of NaOH used is drastically reduced. In addition, the cleaning solution that vaporizes and removes CO 2 that hinders the removal of fluorine contains C
When a (OH) 2 is added, fluorine precipitates as CaF 2 . Further, since CO 2 is vaporized and removed, the amount of the deposits is drastically reduced. Hereinafter, the present invention will be described in more detail with reference to examples.
【０００９】[0009]
【実施例】比較例 本出願人の日立工場にて稼動中のＺ炉（前掲「資源と素
材」第１１７５頁参照）のｐＨを９にしたときのＮａＯ
Ｈ洗浄廃液５００ｍＬを、試験液として使用し、硫酸第
１鉄または硫酸添加及びその後のＣａ（ＯＨ）2 添加を
行った。なお試験液中の、全Ｆ濃度は１３５０ｍｇ／
Ｌ，全ＣＯ3 濃度は２８ｇ／Ｌであった。試験の結果を
表１（図１）に示す。EXAMPLES Comparative Example NaO when the pH of a Z furnace (refer to the above-mentioned “Resources and Materials”, page 1175) operating at the Hitachi plant of the present applicant was 9
500 mL of H washing waste liquid was used as a test solution, and ferrous sulfate or sulfuric acid was added, and then Ca (OH) 2 was added. The total F concentration in the test solution was 1350 mg /
L, the total CO 3 concentration was 28 g / L. The test results are shown in Table 1 (FIG. 1).
【００１０】表１において、Ｎｏ．１はＣａ（ＯＨ）2
添加前のｐＨが高い（ｐＨ＝８．４）ために、ろ液中の
Ｆ濃度が高く、Ｆの除去が不完全である。また、Ｆｅが
沈殿するため残渣（殿物）重量も多くなっている。次
に、Ｎｏ．２〜７はｐＨ調整に硫酸を用いたが、ＣＯ2
の吸収が多いため多量の硫酸を必要としている。Ｆにつ
いても、Ｎｏ．３〜５は硫酸添加後のｐＨが高く、ＣＯ
2 の除去が不充分なためＦ除去が不完全である。Ｎｏ．
２，６，７はｐＨを６以下に調整し、ＣＯ2 を除去した
ためＦ濃度は低くなったが、Ｃａ（ＯＨ）2 添加量、殿
物量が多くなっているIn Table 1, No. 1 is Ca (OH) 2
Since the pH before the addition is high (pH = 8.4), the F concentration in the filtrate is high, and the removal of F is incomplete. Further, since Fe precipitates, the weight of the residue (deposit) increases. Next, No. 2-7 has been with sulfuric acid for pH adjustment, CO 2
It requires a large amount of sulfuric acid due to its high absorption. No. F, 3 to 5 have a high pH after addition of sulfuric acid,
F removal is incomplete due to insufficient removal of 2 . No.
In 2 , 6, and 7, the pH was adjusted to 6 or less, and the F concentration was lowered due to the removal of CO 2 , but the amount of Ca (OH) 2 added and the amount of by-products increased.
【００１１】実施例 Ｚ炉のＮａＯＨ洗浄廃液（ｐＨ８にコントロール）５０
０ｍＬを試験液として使用し、硫酸第１鉄又は硫酸添
加、及びその後Ｃａ（ＯＨ）2 添加を行った。試験液中
の全Ｆ濃度は１１４０ｍｇ／Ｌ，全ＣＯ2 濃度は１ｇ／
Ｌであった。試験結果を表２（図２）に示す。この結果
を表１と対比すると残渣量及び液中のＦ濃度ともに非常
に少なくなっていることが分かる。Example 50 NaOH washing waste liquid in the Z furnace (control to pH 8) 50
Using 0 mL as a test solution, ferrous sulfate or sulfuric acid was added, and then Ca (OH) 2 was added. The total F concentration in the test solution was 1140 mg / L and the total CO 2 concentration was 1 g /
L. The test results are shown in Table 2 (FIG. 2). When this result is compared with Table 1, it can be seen that both the amount of the residue and the F concentration in the liquid are extremely low.
【００１２】[0012]
【発明の効果】以上説明したように、従来はフッ素炭酸
塩を含む多量の殿物が発生し、処理後のＦ濃度も不完全
であったが、本発明によると炭酸は気化し、フッ素は少
量の弗化物として回収し、無害化することができる。さ
らに洗浄液のｐＨを８以下にし、ＣＯ2 の不要の吸収を
抑制するために、アルカリ使用量を削減することもでき
る。よって、本発明法は資源の有効再使用を図り、また
殿物処理量を少なくすることができる非常に優れた方法
である。As described above, conventionally, a large amount of deposits containing fluorocarbonate were generated, and the F concentration after the treatment was incomplete. However, according to the present invention, carbonic acid was vaporized and fluorine was reduced. It can be recovered as a small amount of fluoride and rendered harmless. Further, in order to reduce the pH of the cleaning solution to 8 or less and suppress unnecessary absorption of CO 2 , the amount of alkali used can be reduced. Therefore, the method of the present invention is a very excellent method capable of effectively reusing resources and reducing the amount of processed by-products.
【図１】 本発明の比較例の試験条件及び結果を示す図
表（表１）である。FIG. 1 is a table (Table 1) showing test conditions and results of a comparative example of the present invention.
【図２】 本発明の実施例の試験条件及び結果を示す図
表（表２）である。FIG. 2 is a table (Table 2) showing test conditions and results of Examples of the present invention.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B01D 53/34,53/62,53/68 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) B01D 53 / 34,53 / 62,53 / 68
Claims (5)
ガスをアルカリ洗浄する排ガス処理法において、ｐＨ８
以下に調整した洗浄液の一部である第１の洗浄液を前記
アルカリ洗浄に繰返し使用し、残部である第２の洗浄液
のｐＨを２〜６に保持して液中のＣＯ2 を気化除去し、
次いでＣＯ2 除去後ｐＨ＝１０〜１１．５に保持された
第３の洗浄液とＣａイオンを接触させることにより液中
のＦを沈殿させることを特徴とする排ガス処理方法。In an exhaust gas treatment method for washing an exhaust gas containing chlorine, fluorine and carbon dioxide gas with an alkali, a pH of 8 is used.
The first cleaning liquid, which is a part of the cleaning liquid adjusted below, is repeatedly used for the alkali cleaning, and the pH of the remaining second cleaning liquid is maintained at 2 to 6 to vaporize and remove CO 2 in the liquid,
An exhaust gas treatment method characterized by contacting Ca ions with a third cleaning solution maintained at a pH of 10 to 11.5 after removing CO 2 to precipitate F in the solution.
ある請求項１記載の排ガス処理方法。2. The exhaust gas treatment method according to claim 1, wherein the exhaust gas is an incineration exhaust gas of industrial waste.
りｐＨを２〜６に保持する請求項１又は２記載の排ガス
処理方法。3. The exhaust gas treatment method according to claim 1, wherein the pH is maintained at 2 to 6 by adding a mineral acid to the second cleaning liquid.
加する請求項１から３までのいずれか１項記載の排ガス
処理方法。4. The exhaust gas treatment method according to claim 1, wherein Ca ions are added in the form of Ca (OH) 2 .
によりｐＨを８以下に調整する請求項１から４までのい
ずれか１項記載の排ガス処理方法。5. The exhaust gas treatment method according to claim 1, wherein the pH is adjusted to 8 or less by adding NaOH to the exhaust gas cleaning liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27865698A JP3247347B2 (en) | 1998-09-30 | 1998-09-30 | Exhaust gas treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27865698A JP3247347B2 (en) | 1998-09-30 | 1998-09-30 | Exhaust gas treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000107561A JP2000107561A (en) | 2000-04-18 |
| JP3247347B2 true JP3247347B2 (en) | 2002-01-15 |
Family
ID=17600333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27865698A Expired - Fee Related JP3247347B2 (en) | 1998-09-30 | 1998-09-30 | Exhaust gas treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3247347B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8696634B2 (en) | 2010-01-27 | 2014-04-15 | Panasonic Corporation | Syringe drive device |
-
1998
- 1998-09-30 JP JP27865698A patent/JP3247347B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8696634B2 (en) | 2010-01-27 | 2014-04-15 | Panasonic Corporation | Syringe drive device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000107561A (en) | 2000-04-18 |
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