JPS63305919A - Process for recovering mg from flue gas desulfurization waste liquids - Google Patents
Process for recovering mg from flue gas desulfurization waste liquidsInfo
- Publication number
- JPS63305919A JPS63305919A JP62141971A JP14197187A JPS63305919A JP S63305919 A JPS63305919 A JP S63305919A JP 62141971 A JP62141971 A JP 62141971A JP 14197187 A JP14197187 A JP 14197187A JP S63305919 A JPS63305919 A JP S63305919A
- Authority
- JP
- Japan
- Prior art keywords
- waste liquid
- desulfurization
- flue gas
- liquid
- tank
- 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.)
- Pending
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 76
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 57
- 230000023556 desulfurization Effects 0.000 title claims abstract description 57
- 239000002699 waste material Substances 0.000 title claims abstract description 56
- 239000003546 flue gas Substances 0.000 title claims abstract description 23
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims description 7
- 239000000428 dust Substances 0.000 claims abstract description 12
- 239000003513 alkali Substances 0.000 claims abstract description 7
- 238000004062 sedimentation Methods 0.000 claims description 9
- 229910019440 Mg(OH) Inorganic materials 0.000 claims description 2
- 230000003009 desulfurizing effect Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 19
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 abstract description 14
- 239000000347 magnesium hydroxide Substances 0.000 abstract description 14
- 235000012254 magnesium hydroxide Nutrition 0.000 abstract description 14
- 229910001862 magnesium hydroxide Inorganic materials 0.000 abstract description 14
- 238000006386 neutralization reaction Methods 0.000 abstract description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 12
- 238000003860 storage Methods 0.000 abstract description 4
- 239000006228 supernatant Substances 0.000 abstract description 3
- 229910001868 water Inorganic materials 0.000 description 8
- 239000000243 solution Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000006227 byproduct Substances 0.000 description 5
- 239000012670 alkaline solution Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005273 aeration Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910052815 sulfur oxide Inorganic materials 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 101100006960 Caenorhabditis elegans let-2 gene Proteins 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、排煙中に含まれる硫黄酸化物（以下Ｓ０８と
記す）を除去する際に使用したＭｇ（ＯＨ）２溶液の脱
硫廃液からのＭｇ回収方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for removing sulfur oxides (hereinafter referred to as S08) contained in flue gas from desulfurization waste liquid of Mg(OH)2 solution used in removing sulfur oxides (hereinafter referred to as S08) contained in flue gas. The present invention relates to a Mg recovery method.
例えば、製鉄所における加熱炉、熱処理炉、あるいはボ
イラー等種々の燃焼装置から排出される排煙中には大気
汚染をもたらす５Ｏ１ｌが含有されており、この排煙中
のＳＯｘを除去すべく脱硫装置が燃焼装置に煙道を介し
て接続されている。For example, the flue gas emitted from various combustion devices such as heating furnaces, heat treatment furnaces, and boilers in steel plants contains 5O1l, which causes air pollution. is connected to the combustion device via a flue.
脱硫装置は、第１図にその概略を示すように、脱硫装置
本体（２）の中間部に燃焼装置からの煙道（りが接続さ
れ、その下部がＭｇ（ＯＨ）２溶液からなる脱硫吸収液
を貯留する脱硫吸収液槽（３）となして撹拌翼（４）を
備え、前記脱硫吸収液槽（３）内の脱硫吸収液は、循環
ライン（５）に設けられたポンプ（９）により脱硫装置
本体（２）上部に汲み上げられ、その位置でノズルによ
り噴霧し、気液反応にて排煙中のＳＯｘが脱硫され、落
下する前記脱硫吸収液は再び脱硫吸収液槽（３）内に貯
留するよう構成されている。又、循環ライン（５１には
、劣化した脱硫吸収液を脱硫廃液として脱硫装置から排
出されるべき廃液ライン（６）を設けている。なお、■
は脱硫吸収液ラインであり、新しい脱硫吸収液を補給す
るようになっており、又、（８）は希釈水ラインであり
、Ｍｇ （ＯＨ） ２濃度の希釈及び脱硫吸収液槽（３
）内の吸収液レベル管理等に設けたものである。As shown schematically in Figure 1, the desulfurization device has a flue from a combustion device connected to the middle part of the desulfurization device main body (2), and a desulfurization absorber made of Mg(OH)2 solution at the bottom. The desulfurization absorption liquid tank (3) for storing the liquid is equipped with a stirring blade (4), and the desulfurization absorption liquid in the desulfurization absorption liquid tank (3) is pumped through a pump (9) provided in the circulation line (5). is pumped up to the top of the desulfurization equipment main body (2), sprayed by a nozzle at that position, SOx in the flue gas is desulfurized by a gas-liquid reaction, and the desulfurization absorption liquid that falls is returned to the desulfurization absorption liquid tank (3). In addition, the circulation line (51) is provided with a waste liquid line (6) in which the degraded desulfurization absorption liquid is discharged from the desulfurization equipment as desulfurization waste liquid.
(8) is the desulfurization absorption liquid line, which is used to supply new desulfurization absorption liquid, and (8) is the dilution water line, which is used for diluting the Mg (OH) 2 concentration and desulfurization absorption liquid tank (3).
) is provided for controlling the absorption liquid level, etc.
このような脱硫装置において、煙道（１）からの排煙は
、脱硫装置本体（匈の中間部に導入され、その上方から
噴霧された脱硫吸収液と反応し、下記反応式により排煙
中の Ｓ０８が除去され、無害となった排煙が脱硫装置
本体（２）の上端より導出される。In such a desulfurization device, the flue gas from the flue (1) reacts with the desulfurization absorption liquid that is introduced into the desulfurization device main body (the middle part of the hood and sprayed from above), and the flue gas reacts with the desulfurization absorption liquid that is sprayed from above. S08 is removed, and the harmless exhaust gas is led out from the upper end of the desulfurization device main body (2).
一方、排煙の脱硫反応により劣化したＭｇ分を含む脱硫
廃液は、廃液ライン（６）より糸外に排出され、新たな
脱硫吸収液は、脱硫吸収液ライン（７）より補給される
。On the other hand, the desulfurization waste liquid containing Mg degraded by the desulfurization reaction of flue gas is discharged to the outside of the line from the waste liquid line (6), and new desulfurization absorption liquid is replenished from the desulfurization absorption liquid line (7).
Ｈ２Ｏ＋ＳＯ２→Ｈ２ＳＯ３
Ｈ２０十ＳＯ＋−０２→Ｈ２ＳＯ３
Ｈ２ＳＯｓ ＋ Ｍｇ （ＯＨ） ２→Ｍ ｇ Ｓ ０
３ ＋ ２ Ｈ２ＯＭｇ ＳＯ３＋ ＳＯ２＋Ｈ２０＋
Ｍｇ （Ｈ３Ｏ３） ２Ｍｇ （Ｈ３Ｏ３） ２ ＋
Ｍｇ （ＯＨ） ２ →２Ｍｇ５（ｈ ＋ ２Ｈ２Ｏ
Ｍｇ ３０３ ＋−０２→Ｍｇ ＳＯ＆上記反応式にお
いて、排煙中のＳ０８が除去された後の脱硫吸収液は、
ＭｇＳＯ３やＭｇ５Ｏ↓を含む酸性の脱硫廃液となり、
このままの状態では系外排水できない。従って、現状で
は廃液ライン（６）からの脱硫廃液は、中和処理を行っ
たのち、更に曝気処理して排水している。H2O+SO2→H2SO3 H20 SO+-02→H2SO3 H2SOs + Mg (OH) 2→M g S 0
3 + 2 H2OMg SO3+ SO2+H20+
Mg (H3O3) 2Mg (H3O3) 2 +
Mg (OH) 2 → 2Mg5(h + 2H2O
Mg 303 +-02 → Mg SO & In the above reaction formula, the desulfurization absorption liquid after S08 in the flue gas is removed is
It becomes acidic desulfurization waste liquid containing MgSO3 and Mg5O↓,
In this state, water cannot be drained out of the system. Therefore, at present, the desulfurization waste liquid from the waste liquid line (6) is subjected to neutralization treatment and then further aeration treatment before being discharged.
前述したように脱硫廃液は、化学反応により生じたＭｇ
ＳＯ３やＭｇＳＯ４を含有して劣化したものであり、こ
れを廃液として中和処理−１曝気処理して排水するのは
省資源の立場から非常に無駄なことである。As mentioned above, desulfurization waste liquid contains Mg produced by chemical reactions.
It contains SO3 and MgSO4 and has deteriorated, and it is very wasteful from the standpoint of resource conservation to use this as waste liquid and perform the neutralization treatment-1 aeration treatment and drain it.
本発明は、脱硫廃液中のＭｇ分の再利用を図ろうとする
ものであり、脱硫廃液中のＭｇ５Ｃｈ、Ｍｇ５Ｏ＋ある
いは未反応のＭｇ（ＯＨ）２等の成分で含有するＭｇを
回収しようとするものである。The present invention aims to reuse the Mg content in the desulfurization waste solution, and aims to recover Mg contained in components such as Mg5Ch, Mg5O+ or unreacted Mg(OH)2 in the desulfurization waste solution. It is.
本発明は、Ｍｇ （ＯＨ） ２溶液により排煙を脱硫処
理した後の廃液に含有するダストを除去し、除去後の廃
液にアルカリを添加して中和廃液とし、該中和廃液中の
Ｍｇ （ＯＨ） ２を沈降分離させてＭｇを回収するこ
とを特徴とするものである。The present invention removes the dust contained in the waste liquid after desulfurizing flue gas with a Mg (OH) 2 solution, adds an alkali to the removed waste liquid to make a neutralized waste liquid, and removes the Mg in the neutralized waste liquid. This method is characterized by recovering Mg by sedimentation and separation of (OH)2.
以下、第２図にもとづいて詳細に説明する。A detailed explanation will be given below based on FIG. 2.
第２図は、本発明の処理フローを示したものである。排
煙の脱硫装置から排出された脱硫廃液は、含有ダストを
除去するために沈降ｉｆｆ ’ＱＤに導かれる。FIG. 2 shows the processing flow of the present invention. The desulfurization waste liquid discharged from the flue gas desulfurization equipment is led to a settling iff'QD to remove the contained dust.
排煙に含有されていたダストは、脱硫装置本体において
排煙に脱硫吸収液を噴霧し脱硫処理する際、ダストも同
時に脱硫廃液中に捕捉して含有しているからである。沈
降槽００は、脱硫廃液を固液分離するものであり、該廃
液中のダストがその底部に沈降し、沈降槽ａｔ＋下端よ
り排出される。除塵された脱硫廃液は中和反応槽０つに
導かれる。又、この中和反応＋＝ ａＺには、アルカリ
貯ｔｆｆｏｍよりアルカリ溶液が導かれる。従って、中
和反応槽０２１内は、脱硫廃液とアルカリ溶液とが混合
されることになり、ＰＨ９〜ＰＨ１２に保たれる。ＰＨ
９以下では、Ｍｇイオンの水酸化物の沈殿が始まらず、
すなわち、Ｍｇ（ＯＨ）２が生成せず、またＰＩ−１１
２以上では、生成したＭｇ（ＯＨ）２の再溶解が始まり
、Ｍｇ （Ｏｆ（） ２を回収することができない。ア
ルカリ貯Ｐａａ：ａより添加するアルカリ溶液としては
、ＮａＯＨ，Ｃａ （ＯＨ）２゜ＮＨ４ＯＨ等があり、
ＮａＯＨを使用する場合は何の問題も生じないが、Ｃａ
（ＯＨ）２を使用するとＣａ５Ｏｔの副生、ＮＨ４０１
１を使用すると（ＮＨ４）２ＳＯ４の副生があり、副生
物の生じる場合は、遠心分離機等により前記副生物とＭ
ｇ （ＯＨ） ２とを分離する必要かある。前記中和反
応槽０２）内で撹拌翼［相］にて十分撹拌混合しながら
ＰＨ９〜ＰＨ１２０Ｍｇ（ＯＨ）２の沈降条件に調整し
て中和廃液とし、該中和反応槽側内にＭｇ （０１０２
が沈降しないようにして沈降槽ＯＩ９に前記中和廃液を
導く。沈降槽ＯＩＯは、中和された中和廃液を固液分離
するものであり、該沈降槽０Φの底部にＭｇ （０１−
１） ２を沈降させ、上澄水は排水とする。沈降槽圓の
底部に沈降したＭｇ（ＯＨ）２は、その下端から取出し
Ｍｇ回収とする。回収されたＭｇ分、すなわち、Ｍｇ（
ＯＨ）２は再び排煙脱硫装置の脱硫吸収液として再利用
することができる。This is because the dust contained in the flue gas is simultaneously captured and contained in the desulfurization waste liquid when the desulfurization absorption liquid is sprayed onto the flue gas in the desulfurization apparatus main body to perform desulfurization treatment. The sedimentation tank 00 separates the desulfurization waste liquid into solid and liquid, and the dust in the waste liquid settles to the bottom of the sedimentation tank 00 and is discharged from the lower end of the sedimentation tank at+. The desulfurized waste liquid from which dust has been removed is led to zero neutralization reaction tanks. Further, an alkaline solution is introduced from the alkaline storage tffom to this neutralization reaction +=aZ. Therefore, the desulfurization waste liquid and the alkaline solution are mixed in the neutralization reaction tank 021, and the pH is maintained at PH9 to PH12. P.H.
If it is less than 9, precipitation of Mg ion hydroxide does not start,
That is, Mg(OH)2 is not produced and PI-11
2 or more, the generated Mg(OH)2 starts to be redissolved and Mg(Of()2 cannot be recovered.The alkaline solution added from the alkaline storage Paa:a is NaOH, Ca(OH)2゜There are NH4OH etc.
No problem occurs when using NaOH, but when using Ca
When (OH)2 is used, Ca5Ot by-product, NH401
When using 1, there is a by-product of (NH4)2SO4, and if a by-product is generated, the by-product and M
Is it necessary to separate g (OH) 2? In the neutralization reaction tank 02), the settling conditions are adjusted to pH 9 to 120 Mg(OH)2 while thoroughly stirring and mixing with a stirring blade [phase] to obtain a neutralization waste liquid, and Mg ( 0102
The neutralized waste liquid is introduced into the settling tank OI9 in such a manner that it does not settle. The sedimentation tank OIO separates the neutralized waste liquid into solid and liquid, and Mg (01-
1) Let 2 settle and drain the supernatant water. The Mg(OH)2 settled at the bottom of the settling tank circle is taken out from the lower end and is used for Mg recovery. The recovered Mg portion, that is, Mg (
OH)2 can be reused as a desulfurization absorption liquid in the flue gas desulfurization equipment.
更に、前記回収したＭｇ（ＯＨ）２を焙焼炉０９に供給
して９００°Ｃ以上に加熱すると、ＭｇＯとして回収す
ることができる。Furthermore, when the recovered Mg(OH)2 is supplied to the roasting furnace 09 and heated to 900°C or higher, it can be recovered as MgO.
なお、第２図において、ａｅ、ａｉは、沈降槽下端から
の切出し用のバルブであり、０υ、０９は、送水用のポ
ンプを示したものである。In addition, in FIG. 2, ae and ai are valves for cutting out from the lower end of the sedimentation tank, and 0υ and 09 are pumps for water supply.
更に、脱硫廃液を中和する際のアルカリ溶液は、必ずし
も市販の前記薬品を使用しなくとも良（、製鉄所におけ
るＣａＣＯ３あるいはＮ ａ２Ｃ０３を使用した溶鋼処
理の際に生成するスラグの冷却廃水、その他製造工程で
副生するアルカリ廃液でも十分使用可能である。Furthermore, the alkaline solution used to neutralize the desulfurization waste liquid does not necessarily have to be the commercially available chemicals mentioned above. Alkaline waste liquid produced as a by-product during the manufacturing process can also be used.
本発明は、まず脱硫廃液を沈降槽に導いて廃液中に含有
するダストを除去することによりＭｇ分回収に際しての
Ｍｇ純度を高め、次いでダスト除去後の廃液にアルカリ
を添加することにより中和廃液としてＭｇ（ＯＨ）２の
沈降を容易とし、脱硫廃液から充分にＭｇ分を回収され
る。In the present invention, the desulfurization waste liquid is first introduced into a settling tank to remove the dust contained in the waste liquid, thereby increasing the Mg purity during Mg recovery, and then neutralizing the waste liquid by adding alkali to the waste liquid after dust removal. This facilitates the precipitation of Mg(OH)2 and sufficiently recovers Mg from the desulfurization waste solution.
製鉄所における排煙発生量３００，０００ Ｎ ｍ”
／ｌ−１ｒの焼結機に接続した排煙脱硫装置にて、該装
置に前記排煙を導き、Ｍｇ （ＯＨ）２ ｉ０度が３０
％の脱硫吸収液を ０．４ ｒ＋？ ／ １−１ ｒ
の割合で供給して排煙を脱硫処理し、脱硫廃液として表
１に示す廃液を回収した。300,000 Nm of flue gas generated at a steelworks
/l-1r sintering machine, the flue gas is introduced into the device and Mg (OH)2 i0 is 30 degrees.
% desulfurization absorption liquid 0.4 r+? / 1-1 r
The flue gas was desulfurized by supplying it at a ratio of 1, and the waste liquid shown in Table 1 was recovered as desulfurization waste liquid.
表 １
前記廃液を５ｒｎ’／Ｈｒの割合でシックナーに導き、
ダスト１８ ｋｇ／Ｈｒを除去したのちの上澄水を、更
に中和反応槽に導いた。中和反応槽では、濃度１０％の
Ｎ ａＯＨを ０．５２／Ｈｒ の割合で添加してＰＩ
−１９，５に調整した中和廃液とし、更にこの中和廃液
をシックナーに導き、Ｍｇ （ＯＨ） ２を８３ ｋｇ
／Ｈｒ の割合で回収した。回収Ｍｇ （ＯＨ） ２の
純度は７５％であった。回収した７５％のＭｇ（ＯＨ）
２の試験焙焼炉に装入し焙焼温度９５０°Ｃで１時間焙
焼した結果、純度６５％のＭｇＯクリンカーを得た。Table 1 The waste liquid was introduced into a thickener at a rate of 5rn'/Hr,
After removing 18 kg/Hr of dust, the supernatant water was further led to a neutralization reaction tank. In the neutralization reaction tank, PI was added by adding NaOH with a concentration of 10% at a rate of 0.52/Hr.
The neutralized waste liquid was adjusted to -19.5, and this neutralized waste liquid was further led to a thickener, and 83 kg of Mg (OH) 2 was added.
/Hr. The purity of the recovered Mg(OH)2 was 75%. 75% Mg(OH) recovered
As a result, MgO clinker with a purity of 65% was obtained as a result of charging it into the test roasting furnace of No. 2 and roasting it at a roasting temperature of 950°C for 1 hour.
本発明は、排煙脱硫装置から発生する脱硫廃液を、ダス
ト除去処理、中和処理することにより従来の投棄処理と
同程度の処理工程で脱硫廃液中に含有するＭｇ分を精度
よく回収することができて省資源の立場から有効であり
、また、従来処理していた脱硫廃液の中和処理、曝気処
理を不要とする効果がある。The present invention is capable of precisely recovering the Mg content in the desulfurization waste liquid in a treatment process comparable to that of conventional dumping treatment by subjecting the desulfurization waste liquid generated from the flue gas desulfurization equipment to dust removal treatment and neutralization treatment. This method is effective in terms of resource conservation, and also eliminates the need for neutralization and aeration of desulfurization waste fluid, which were conventionally treated.
第１図は、排煙脱硫装置の概略図であり、第２図は、本
発明の脱硫廃液の処理フロー図である。
１１・・・沈降槽 １２・・・中和反応槽１
３・・・アルカリ貯槽 １４・・・沈降槽１５・・
・焙焼炉FIG. 1 is a schematic diagram of a flue gas desulfurization apparatus, and FIG. 2 is a processing flow diagram of desulfurization waste liquid according to the present invention. 11... Sedimentation tank 12... Neutralization reaction tank 1
3... Alkali storage tank 14... Sedimentation tank 15...
・Roasting furnace
Claims (1)
液に含有するダストを除去し、除去後の廃液にアルカリ
を添加して中和廃液とし、該中和廃液中のＭｇ（ＯＨ）
＿２を沈降分離させてＭｇを回収する排煙脱硫廃液から
のＭｇ回収方法。After desulfurizing flue gas with Mg(OH)_2 solution, remove the dust contained in the waste liquid, add alkali to the removed waste liquid to make a neutralized waste liquid, and remove the Mg(OH) in the neutralized waste liquid.
A method for recovering Mg from flue gas desulfurization waste liquid, which recovers Mg by sedimentation and separation of _2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62141971A JPS63305919A (en) | 1987-06-05 | 1987-06-05 | Process for recovering mg from flue gas desulfurization waste liquids |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62141971A JPS63305919A (en) | 1987-06-05 | 1987-06-05 | Process for recovering mg from flue gas desulfurization waste liquids |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63305919A true JPS63305919A (en) | 1988-12-13 |
Family
ID=15304385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62141971A Pending JPS63305919A (en) | 1987-06-05 | 1987-06-05 | Process for recovering mg from flue gas desulfurization waste liquids |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63305919A (en) |
-
1987
- 1987-06-05 JP JP62141971A patent/JPS63305919A/en active Pending
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