JP2000063116A - New calcium hydroxide, its production and acidic gas- treating agent including the same as effective component - Google Patents
New calcium hydroxide, its production and acidic gas- treating agent including the same as effective componentInfo
- Publication number
- JP2000063116A JP2000063116A JP10229818A JP22981898A JP2000063116A JP 2000063116 A JP2000063116 A JP 2000063116A JP 10229818 A JP10229818 A JP 10229818A JP 22981898 A JP22981898 A JP 22981898A JP 2000063116 A JP2000063116 A JP 2000063116A
- Authority
- JP
- Japan
- Prior art keywords
- calcium hydroxide
- specific gravity
- surface area
- treating agent
- apparent specific
- 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
- Treating Waste Gases (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ＢＥＴ比表面積が
大きく、かつ見掛比重が大きい新規水酸化カルシウム、
それを効率よく製造する方法及びそれを有効成分とする
酸性ガス処理剤に関するものである。TECHNICAL FIELD The present invention relates to a novel calcium hydroxide having a large BET specific surface area and a large apparent specific gravity,
The present invention relates to a method for efficiently producing the same and an acidic gas treating agent containing the same as an active ingredient.
【０００２】[0002]
【従来の技術】ごみ焼却炉、火力発電所その他のボイラ
ー等から生じる廃ガスは、一般に硫黄酸化物、塩化水素
等の酸性ガス成分を多量に含有するため、通常はこれを
廃ガス煙道中において塩基性アルカリ土類金属化合物粉
体と接触させて硫酸塩や塩化物の粉体とし、これをバグ
フィルタ（ｂａｇ ｆｉｌｔｅｒ）や電気集塵器で分離
した後にガス分を大気中に放出している。2. Description of the Related Art Waste gas generated from refuse incinerators, thermal power plants and other boilers generally contains a large amount of acidic gas components such as sulfur oxides and hydrogen chloride. A powder of sulfate or chloride is brought into contact with a powder of a basic alkaline earth metal compound, which is separated by a bag filter or an electrostatic precipitator, and then a gas component is released into the atmosphere. .
【０００３】ところで、一般的に廃ガス中に含まれる酸
性ガス成分と水酸化カルシウムとの反応性は水酸化カル
シウム粒子の表面積と相関があり、水酸化カルシウム粒
子の表面積にほぼ比例して酸性ガス成分との反応性が定
まるとされているが、酸性ガス処理剤として例えば市販
工業用消石灰を用いた場合、この粒子のＢＥＴ比表面積
は５〜２０ｍ2／ｇと小さいので、水酸化カルシウムと
廃ガス中の酸性ガス成分との反応が粒子の表面でしか起
こらず、酸性ガス処理剤の大部分は未反応のままダスト
として排出されてしまうため、モル比で酸性ガス成分の
２〜３倍量の酸性ガス処理剤を投入する必要があった。
また、粉体の流動性が良好でないために、貯蔵タンク内
でブリッジングを生じたり、貯蔵タンクと煙道の噴射口
との間の輸送管中で閉塞を起こしやすいという問題があ
った。By the way, generally, the reactivity of the acidic gas component contained in the waste gas with calcium hydroxide has a correlation with the surface area of the calcium hydroxide particles, and the acidic gas is almost proportional to the surface area of the calcium hydroxide particles. Although it is said that the reactivity with the components is determined, when, for example, commercial slaked lime for commercial use is used as the acid gas treating agent, the BET specific surface area of these particles is as small as 5 to 20 m 2 / g, and therefore calcium hydroxide and waste The reaction with the acidic gas component in the gas occurs only on the surface of the particles, and most of the acidic gas treating agent is discharged as dust without reaction. Therefore, the molar ratio is 2 to 3 times that of the acidic gas component. It was necessary to add the acid gas treating agent of.
Further, since the powder has poor fluidity, there is a problem that bridging is likely to occur in the storage tank and clogging is likely to occur in the transportation pipe between the storage tank and the flue nozzle.
【０００４】このような問題を解決するために、水酸化
カルシウム粒子の表面積を大きくする方法が知られてい
るが（例えば特公平６−８１９４号公報）、得られた水
酸化カルシウム製品は工業用消石灰に比べ、表面積は増
大するものの、見掛比重はゆるみ見掛比重で０．２〜
０．３ｇ／ｃｍ3、固め見掛比重で０．４ｇ／ｃｍ3前後
と、それぞれ工業用消石灰の約０．４ｇ／ｃｍ3、約
０．７ｇ／ｃｍ3より小さくなるため、重量の割には広
大な貯蔵スペースを要するし、また製品使用時に貯蔵タ
ンク出口から製品を排出するのが困難になるなど、作業
性に難があった。また、製品を陸上輸送する際にトラッ
クやエアースライド車などの輸送用車両で輸送している
が、見掛比重が小さいため、輸送用車両に所定重量まで
積載することができず、輸送コストが増大するという問
題があった。In order to solve such a problem, a method of increasing the surface area of calcium hydroxide particles is known (for example, Japanese Patent Publication No. 6-8194), but the obtained calcium hydroxide product is for industrial use. Compared to slaked lime, the surface area is increased, but the apparent specific gravity is loose and the apparent specific gravity is 0.2-
0.3g / cm 3 and a solidified apparent specific gravity of 0.4g / cm 3 , which are smaller than the industrial slaked lime of about 0.4g / cm 3 and about 0.7g / cm 3 , respectively. Requires a large storage space, and it is difficult to discharge the product from the outlet of the storage tank when using the product. In addition, when products are transported by land, they are transported by transportation vehicles such as trucks and air slide vehicles, but their apparent specific gravity is so small that they cannot be loaded to a prescribed weight on the transportation vehicles, which reduces transportation costs. There was a problem of increase.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、酸性ガス処
理剤などとして用いられる従来の水酸化カルシウムがも
つ問題点を解決し、酸性ガスとの反応性が向上し、廃ガ
ス中の酸性ガス成分を効率よく除去でき、使用量の減
少、貯蔵タンクからの排出時のトラブルの減少、貯蔵ス
ペースの縮小及び輸送コストの低減を可能にし、流動性
が改良されて、配管詰まりや排出不良などのトラブルが
減少し、作業性が向上した水酸化カルシウムを提供する
ことを目的としてなされたものである。DISCLOSURE OF THE INVENTION The present invention solves the problems of the conventional calcium hydroxide used as an acid gas treating agent and the like, improves the reactivity with acid gas, and increases the acid gas in waste gas. The components can be removed efficiently, the usage amount can be reduced, the trouble at the time of discharging from the storage tank can be reduced, the storage space can be reduced and the transportation cost can be reduced, and the fluidity can be improved to prevent clogging of pipes and defective discharge. The purpose of the present invention is to provide calcium hydroxide with reduced troubles and improved workability.
【０００６】[0006]
【課題を解決するための手段】本発明者らは、上記した
好ましい特性を有する水酸化カルシウムを開発すべく鋭
意研究を重ねた結果、所定値以上の高比表面積を有する
とともに、所定値以上の大きい見掛比重を有する水酸化
カルシウムがその目的に適合しうることを見出し、この
知見に基づいて本発明を完成するに至った。Means for Solving the Problems As a result of intensive studies to develop calcium hydroxide having the above-mentioned preferable characteristics, the present inventors have a high specific surface area of not less than a predetermined value and It has been found that calcium hydroxide having a large apparent specific gravity can meet the purpose, and the present invention has been completed based on this finding.
【０００７】すなわち、本発明は、４５ｍ2／ｇ以上の
ＢＥＴ比表面積、０．４ｇ／ｃｍ3以上のゆるみ見掛比
重、及び０．７ｇ／ｃｍ3以上の固め見掛比重を有する
水酸化カルシウムを提供するものである。本発明の水酸
化カルシウムは、酸化カルシウムを消化してＢＥＴ比表
面積が少なくとも３５ｍ2／ｇ以上の水酸化カルシウム
を調製し、次いでこれに粉砕と圧密造粒の処理を単独の
装置で施すことによって製造することができる。また、
本発明の水酸化カルシウムは、それを有効成分とする酸
性ガス処理剤として用いられる。That is, the present invention provides calcium hydroxide having a BET specific surface area of 45 m 2 / g or more, a loose apparent specific gravity of 0.4 g / cm 3 or more, and a solid apparent specific gravity of 0.7 g / cm 3 or more. Is provided. The calcium hydroxide of the present invention is prepared by digesting calcium oxide to prepare calcium hydroxide having a BET specific surface area of at least 35 m 2 / g or more, and then subjecting this to crushing and consolidation granulation in a single apparatus. It can be manufactured. Also,
The calcium hydroxide of the present invention is used as an acidic gas treating agent containing it as an active ingredient.
【０００８】[0008]
【発明の実施の形態】本発明の水酸化カルシウムはＢＥ
Ｔ比表面積及び見掛比重が共に大きい点で新規なもので
あって、ＢＥＴ比表面積が大きいことで、反応性が向上
するので、このような水酸化カルシウム粉体を使用する
ことで、より高効率の反応が期待でき、例えば廃ガス処
理に用いて酸性ガス成分を効率よく除去するなど酸性ガ
スとの反応性を向上させ、また反応性の向上により使用
量も減少させることが可能になる。また、見掛比重が大
きいので、貯蔵スペースを縮小したり、輸送コストを低
減したりすることができる。また、流動性も改良され、
それにより配管詰まりや排出不良などのトラブルを減少
させるなど、作業性を向上させることが可能になる。BEST MODE FOR CARRYING OUT THE INVENTION The calcium hydroxide of the present invention is BE
It is novel in that both T specific surface area and apparent specific gravity are large, and since the BET specific surface area is large, the reactivity is improved. A reaction with high efficiency can be expected, and it is possible to improve the reactivity with the acidic gas, for example, to efficiently remove the acidic gas component in the waste gas treatment, and to improve the reactivity to reduce the amount used. Moreover, since the apparent specific gravity is large, it is possible to reduce the storage space and the transportation cost. Also, the fluidity is improved,
As a result, it is possible to improve workability by reducing troubles such as pipe clogging and defective discharge.
【０００９】本発明の水酸化カルシウムを製造するに
は、例えば先ず酸化カルシウムを消化して所定比表面積
の水酸化カルシウムを調製する。この調製方法について
は特に制限はないが、好ましくは消化反応の際に水酸化
カルシウム粒子の表面積を大きくする方法（例えば、特
公平６−８１９４号公報）が挙げられ、中でもアルコー
ルなどの消化反応を遅延させる有機溶媒の存在下に消化
する方法が有利である。酸化カルシウムは特に制限され
ず、石灰石を仮焼したものが一般的であるが、好ましく
は乾式粉砕されたもの、例えばケージミル、バイブロミ
ル、ボールミルなどで粉砕されたものが用いられる。In order to produce the calcium hydroxide of the present invention, for example, calcium oxide is first digested to prepare calcium hydroxide having a predetermined specific surface area. The preparation method is not particularly limited, but a method of increasing the surface area of the calcium hydroxide particles during the digestion reaction (for example, Japanese Examined Patent Publication No. 6-8194) is preferable, and among them, the digestion reaction of alcohol or the like is performed. A method of digesting in the presence of a retarding organic solvent is advantageous. The calcium oxide is not particularly limited and is generally calcined limestone, but preferably dry crushed one, for example, crushed by cage mill, vibro mill, ball mill or the like is used.
【００１０】次いで、このようにして調製された水酸化
カルシウムに、粉砕と圧密造粒の処理を単独の装置で施
す。このようにして、水酸化カルシウムはＢＥＴ比表面
積４５ｍ2／ｇ以上、ゆるみ見掛比重０．４ｇ／ｃｍ3以
上、固め見掛比重０．７ｇ／ｃｍ3以上になるように調
製される。ここで、ゆるみ見掛比重とは疎充填時の見掛
比重を意味し、また固め見掛比重とは密充填時の見掛比
重を意味する。このような見掛比重は、原料粉体の種
類、入手経路や調製手段、使用目的などにより様々に調
整される。水酸化カルシウムの各見掛比重が上記各下限
値よりも小さいと、積載重量も少なくなってしまうため
輸送コストが増大し、また貯蔵スペースも大きくなるの
で好ましくない。また、水酸化カルシウムのＢＥＴ比表
面積が４５ｍ2／ｇ未満では水酸化カルシウムの反応性
向上効果が十分には得られないので好ましくない。Then, the calcium hydroxide thus prepared is subjected to pulverization and compaction granulation treatments in a single apparatus. In this way, calcium hydroxide is prepared to have a BET specific surface area of 45 m 2 / g or more, a loose apparent specific gravity of 0.4 g / cm 3 or more, and a solidified apparent specific gravity of 0.7 g / cm 3 or more. Here, the loose apparent specific gravity means an apparent specific gravity at the time of sparse filling, and the solid apparent specific gravity means an apparent specific gravity at the time of dense filling. Such apparent specific gravity is variously adjusted depending on the type of raw material powder, the acquisition route, the preparation means, the purpose of use, and the like. When the apparent specific gravity of calcium hydroxide is smaller than the lower limit values described above, the loading weight is reduced, the transport cost increases, and the storage space also increases, which is not preferable. If the BET specific surface area of calcium hydroxide is less than 45 m 2 / g, the effect of improving the reactivity of calcium hydroxide cannot be sufficiently obtained, which is not preferable.
【００１１】また、粉砕と圧密造粒の処理を単独で施す
装置としては、粉砕と同時に圧密造粒の処理が行えるよ
うな装置、例えば粉砕媒体を備えた装置などが好まし
く、中でも特に振動ミルやボールミルが有利である。As the apparatus for independently performing the crushing and the compaction granulation treatment, an apparatus capable of simultaneously performing the crushing and the compaction granulation treatment, for example, an apparatus equipped with a pulverizing medium is preferable. Ball mills are preferred.
【００１２】このような方法によって見掛比重及びＢＥ
Ｔ比表面積が大きくなるのは、見掛比重の小さい水酸化
カルシウムの比較的大きな一次粒子が一度粉砕され、そ
の後の粉砕工程中で圧密造粒作用が誘発され、該作用に
より一度粉砕されて生じた細かい水酸化カルシウム粒子
が二次凝集を生じることで粒子が肥大化し、このような
作用が繰り返されることで平均粒径が大きくなること
と、このような肥大化がいったんは粉砕された上記粒子
の増大した表面積を減少させないような点接着でもたら
されるからであると推測される。By such a method, the apparent specific gravity and BE
The T specific surface area becomes large because a relatively large primary particle of calcium hydroxide having a small apparent specific gravity is pulverized once, and a compaction granulation action is induced in the subsequent pulverization step, and the pulverization is caused by the action. Fine calcium hydroxide particles undergo secondary agglomeration to enlarge the particles, and by repeating such actions, the average particle diameter increases, and the above-mentioned particles once pulverized to such enlargement. It is presumed that this is because the point adhesion does not reduce the increased surface area of.
【００１３】ところで、粉体の流動性の指標となる粉体
物性については、例えば安息角や圧縮度などが知られて
いるが、中でも圧縮度は粉体の流動性との関係が深いと
され、以下の式で表わされる。
Ｃ＝（Ｐ−Ａ）×１００／Ｐ
（式中のＣ、Ｐ及びＡはそれぞれ圧縮度、固め見掛比重
及びゆるみ見掛比重を示す）
圧縮度が小さいほど、その粉体の流動性は良好であると
されている。この流動性について、本発明の水酸化カル
シウムを従来のそれと比べると、本発明のものの方が良
好である。この理由については必ずしも明確ではない
が、粉体の流動性との関係が深い圧縮度に注目した場
合、本発明の水酸化カルシウムの方が従来のそれより小
さくなっていることも一因であると推測される。Regarding the physical properties of powder, which is an index of the fluidity of powder, for example, the angle of repose and the degree of compression are known. Among them, the degree of compression is said to be closely related to the fluidity of the powder. , Is expressed by the following equation. C = (P−A) × 100 / P (C, P and A in the formula represent compression degree, compacted apparent specific gravity and loose apparent specific gravity, respectively) It is said to be good. With respect to this fluidity, the calcium hydroxide of the present invention is better than that of the conventional one in the present invention. The reason for this is not always clear, but when attention is paid to the degree of compression, which has a deep relationship with the fluidity of the powder, it is partly because the calcium hydroxide of the present invention is smaller than the conventional one. Presumed to be.
【００１４】本発明の水酸化カルシウムは、ごみ焼却
炉、火力発電所その他のボイラー等の廃ガス中の酸性ガ
スを除去するためなどに用いられる酸性ガス処理剤にお
いて、その有効成分とすることができる。The calcium hydroxide of the present invention can be used as an effective component in an acid gas treating agent used for removing acid gas in waste gas of waste incinerators, thermal power plants and other boilers. it can.
【００１５】[0015]
【実施例】次に実施例により本発明をさらに詳細に説明
するが、本発明はこれらの例によって何ら限定されるも
のではない。なお、水酸化カルシウム粉体の物性は以下
のようにして求めた。
（１）平均粒径：堀場製作所製の粒度分布計（ＬＡ−９
２０、乾式ユニット）を用い５０％累積粒子径として求
めた。
（２）見掛比重：ホソカワミクロン社製のパウダーテス
タ（ＰＴ−Ｎ型）を用いて測定した。
（３）圧縮度：ホソカワミクロン社製のパウダーテスタ
（ＰＴ−Ｎ型）を用いて測定した。
（４）ＢＥＴ比表面積：島津製作所製Ｆｌｏｗ Ｓｏｒ
ｂ ＩＩ ２３００を用いて測定した。The present invention will be described in more detail by way of examples, which should not be construed as limiting the invention thereto. The physical properties of the calcium hydroxide powder were determined as follows. (1) Average particle size: Particle size distribution meter (LA-9 manufactured by Horiba, Ltd.)
No. 20, dry unit) was used as the 50% cumulative particle size. (2) Apparent specific gravity: Measured using a powder tester (PT-N type) manufactured by Hosokawa Micron. (3) Compressibility: Measured using a powder tester (PT-N type) manufactured by Hosokawa Micron. (4) BET specific surface area: Flow Sor manufactured by Shimadzu Corporation
b II 2300.
【００１６】まず、比較のために比較例を示す。
比較例１
ＢＥＴ比表面積１４．８ｍ2／ｇ、ゆるみ見掛比重０．
４１ｇ／ｃｍ3、固め見掛比重０．７７ｇ／ｃｍ3、圧縮
度４６．８％、平均粒径７．３μｍのＪＩＳ特号消石灰
を酸性ガス処理剤として用い、処理能力１２０ｔ／日の
ごみ焼却炉の稼働時の廃ガス処理を行った。廃ガス処理
塔の廃ガス煙道入口における廃ガス中の酸性成分濃度は
ＨＣｌが５８０ｐｐｍ、ＳＯ2が４０ｐｐｍであり、Ｈ
ＣｌとＳＯ2の入口合計量に対して酸性ガス処理剤を消
石灰の量が約４当量となるような割合で噴射した。塔出
口における酸性成分濃度はＨＣｌが２９ｐｐｍ、ＳＯ2
が１３ｐｐｍであり、除去率はＨＣｌが９５％、ＳＯ2
が６８％であった。この際の飛灰の集塵はバグフィルタ
ーで良好に行われ、また、廃ガス温度は１７５〜１８５
℃であった。また、配管中における目詰まりが一時間平
均で２回発生した。First, a comparative example will be shown for comparison. Comparative Example 1 BET specific surface area of 14.8 m 2 / g, loose apparent specific gravity of 0.
41 g / cm 3 , compacted apparent specific gravity 0.77 g / cm 3 , compression degree 46.8%, average particle size 7.3 μm JIS special slaked lime is used as an acid gas treatment agent, and the incineration of refuse is 120 t / day. Waste gas was treated when the furnace was operating. The concentration of acidic components in the waste gas at the inlet of the waste gas flue of the waste gas treatment tower is 580 ppm for HCl and 40 ppm for SO 2 ,
The acid gas treating agent was injected at a ratio such that the amount of slaked lime was about 4 equivalents with respect to the total amount of Cl and SO 2 inlets. The concentration of acidic components at the outlet of the tower was 29 ppm for HCl and SO 2
Is 13 ppm, the removal rate is 95% HCl, SO 2
Was 68%. The fly ash at this time is satisfactorily collected by a bag filter, and the waste gas temperature is 175 to 185.
It was ℃. In addition, clogging in the piping occurred twice per hour on average.
【００１７】比較例２
ＢＥＴ比表面積４３．７ｍ2／ｇ、ゆるみ見掛比重０．
２５ｇ／ｃｍ3、固め見掛比重０．４６ｇ／ｃｍ3、圧縮
度４５．７％、平均粒径２．８μｍの高比表面積水酸化
カルシウムを酸性ガス処理剤として用い、処理能力１２
０ｔ／日のごみ焼却炉の稼働時の廃ガス処理を行った。
廃ガス処理塔の廃ガス煙道入口における廃ガス中の酸性
成分濃度はＨＣｌが５８０ｐｐｍ、ＳＯ2が４０ｐｐｍ
であり、ＨＣｌとＳＯ2の入口合計量に対して酸性ガス
処理剤を消石灰の量が約２当量となるような割合で噴射
した。塔出口における酸性成分濃度はＨＣｌが２３ｐｐ
ｍ、ＳＯ2が１２ｐｐｍであり、除去率はＨＣｌが９６
％、ＳＯ2が７０％であった。この際の飛灰の集塵はバ
グフィルターで良好に行われ、また、廃ガス温度は１７
５〜１８５℃であった。また、配管中の目詰まりはなか
ったが、貯蔵タンク内の酸性ガス処理剤の排出が困難に
なるトラブルが発生した。Comparative Example 2 BET specific surface area of 43.7 m 2 / g, loose apparent specific gravity of 0.
25 g / cm 3, solidifying the apparent specific gravity of 0.46 g / cm 3, the compression degree of 45.7 percent, with a high specific surface area of calcium hydroxide having an average particle diameter of 2.8μm as the acidic gas treating agent, capacity 12
Waste gas treatment was performed during the operation of the refuse incinerator at 0 t / day.
The concentration of acidic components in the exhaust gas at the exhaust gas flue inlet of the exhaust gas processing tower is 580 ppm for HCl and 40 ppm for SO 2.
The acid gas treating agent was injected at a ratio such that the amount of slaked lime was about 2 equivalents with respect to the total amount of HCl and SO 2 at the inlet. The concentration of acidic components at the outlet of the tower is 23 pp for HCl.
m, SO 2 is 12 ppm, and the removal rate is 96 for HCl.
%, SO 2 was 70%. The fly ash at this time is well collected by the bag filter, and the waste gas temperature is 17
It was 5-185 degreeC. Further, although the piping was not clogged, there was a problem that it became difficult to discharge the acid gas treating agent from the storage tank.
【００１８】実施例１
ロータリーキルン炉で焼成され、バイブロミルで乾式粉
砕された酸化カルシウム１００重量部に対して、６０重
量％のエタノール水溶液９２重量部を消化液として加
え、消化機中で１５分間混合後、１００℃で３０分間混
合した後、熟成機に供給するとともに、熟成機内が１１
０℃になるようにジャケットに加熱蒸気を導通して加熱
し、熟成しながら、水及びエタノールを気化させ、さら
に連続式振動ミル〔容器容積２００００ｃｍ3、媒体
（ＳＵＪ−２、φ１２ｍｍ、充填率８０％）〕により加
振力約７Ｇで処理し、水酸化カルシウムを得た。得られ
た水酸化カルシウムの粉体物性を測定したところ、ＢＥ
Ｔ比表面積４９．２ｍ2／ｇ、ゆるみ見掛比重０．５０
ｇ／ｃｍ3、固め見掛比重０．７４ｇ／ｃｍ3、圧縮度３
２．２％、平均粒径８．５μｍであった。この粉体を酸
性ガス処理剤として用い、処理能力１２０ｔ／日のごみ
焼却炉の稼働時の廃ガス処理を行った。廃ガス処理塔の
廃ガス煙道入口における廃ガス中の酸性成分濃度はＨＣ
ｌが６４０ｐｐｍ、ＳＯ2が４５ｐｐｍであり、ＨＣｌ
とＳＯ2の入口合計量に対して酸性ガス処理剤を消石灰
の量が約２当量となるような割合で噴射した。塔出口に
おける酸性成分濃度はＨＣｌが１０ｐｐｍ、ＳＯ2が８
ｐｐｍであり、除去率はＨＣｌが９８％、ＳＯ2が８２
％であった。この際の飛灰の集塵はバグフィルターで良
好に行われ、また、廃ガス温度は１７５〜１８５℃であ
った。また、配管中の目詰まりはなく、貯蔵タンク内の
酸性ガス処理剤の排出性は良好であった。Example 1 To 100 parts by weight of calcium oxide calcined in a rotary kiln furnace and dry-ground in a vibromill, 92 parts by weight of a 60% by weight aqueous ethanol solution was added as a digestive solution, and after mixing for 15 minutes in a digester. , Mix at 100 ℃ for 30 minutes, then supply to the aging machine and
Water and ethanol are vaporized while heating by passing heating steam through a jacket so that the temperature becomes 0 ° C., and a continuous vibration mill [container volume 20000 cm 3 , medium (SUJ-2, φ12 mm, filling rate 80 %)] With a vibrating force of about 7 G to obtain calcium hydroxide. The powder physical properties of the obtained calcium hydroxide were measured and found to be BE
T specific surface area 49.2 m 2 / g, loose apparent specific gravity 0.50
g / cm 3, solidifying the apparent specific gravity of 0.74g / cm 3, the degree of compression 3
The average particle size was 2.2% and the average particle size was 8.5 μm. Using this powder as an acid gas treating agent, a waste gas treatment was performed when the refuse incinerator was operated at a treatment capacity of 120 t / day. The concentration of acidic components in the exhaust gas at the exhaust gas flue inlet of the exhaust gas treatment tower is HC
l is 640 ppm, SO 2 is 45 ppm, HCl
And the acid gas treating agent was injected at a ratio such that the amount of slaked lime was about 2 equivalents with respect to the total amount of SO 2 inlet. The concentration of acidic components at the outlet of the tower was 10 ppm for HCl and 8 for SO 2.
The removal rate is 98% for HCl and 82 for SO 2.
%Met. The fly ash at this time was satisfactorily collected by a bag filter, and the waste gas temperature was 175 to 185 ° C. Further, there was no clogging in the pipe, and the dischargeability of the acid gas treating agent in the storage tank was good.
【００１９】実施例２
ＢＥＴ比表面積４２．８ｍ2／ｇ、ゆるみ見掛比重０．
２３ｇ／ｃｍ3、固め見掛比重０．４６ｇ／ｃｍ3、圧縮
度４９．０％、平均粒径３．４μｍである市販の高比表
面積水酸化カルシウムを、連続式振動ミル〔容器容積２
００００ｃｍ3、媒体（ＳＵＪ−２、φ１２ｍｍ、充填
率８０％）〕により加振力約７Ｇで処理した。得られた
水酸化カルシウムの粉体物性を測定したところ、ＢＥＴ
比表面積５０．５ｍ2／ｇ、ゆるみ見掛比重０．５８ｇ
／ｃｍ3、固め見掛比重０．８７ｇ／ｃｍ3、圧縮度３
３．５％、平均粒径７．１μｍであった。この粉体を酸
性ガス処理剤として用い、処理能力１２０ｔ／日のごみ
焼却炉の稼働時の廃ガス処理を行った。廃ガス処理塔の
廃ガス煙道入口における廃ガス中の酸性成分濃度はＨＣ
ｌが５７０ｐｐｍ、ＳＯ2が３７ｐｐｍであり、ＨＣｌ
とＳＯ2の入口合計量に対して酸性ガス処理剤を消石灰
の量が約２当量となるような割合で噴射した。塔出口に
おける酸性成分濃度はＨＣｌが８ｐｐｍ、ＳＯ2が６ｐ
ｐｍであり、除去率はＨＣｌが９９％、ＳＯ2が８４％
であった。この際の飛灰の集塵はバグフィルターで良好
に行われ、また、廃ガス温度は１７５〜１８５℃であっ
た。また、配管中の目詰まりはなく、貯蔵タンク内の酸
性ガス処理剤の排出性は良好であった。Example 2 BET specific surface area of 42.8 m 2 / g, loose apparent specific gravity of 0.
23 g / cm 3, solidifying the apparent specific gravity of 0.46 g / cm 3, the compression degree of 49.0%, an average particle size of commercially available high-specific surface area of calcium hydroxide is 3.4 .mu.m, continuous vibration mill [vessel volume 2
0000 cm 3 , a medium (SUJ-2, φ12 mm, filling rate 80%)] was applied with a vibrating force of about 7 G. When the powder physical properties of the obtained calcium hydroxide were measured, BET
Specific surface area 50.5 m 2 / g, loose apparent specific gravity 0.58 g
/ Cm 3 , compacted apparent specific gravity 0.87 g / cm 3 , compressibility 3
The average particle size was 3.5% and the average particle size was 7.1 μm. Using this powder as an acid gas treating agent, a waste gas treatment was performed when the refuse incinerator was operated at a treatment capacity of 120 t / day. The concentration of acidic components in the exhaust gas at the exhaust gas flue inlet of the exhaust gas treatment tower is HC
1 is 570 ppm, SO 2 is 37 ppm, HCl
And the acid gas treating agent was injected at a ratio such that the amount of slaked lime was about 2 equivalents with respect to the total amount of SO 2 inlet. The concentration of acidic components at the outlet of the tower is 8 ppm for HCl and 6 p for SO 2.
The removal rate is 99% for HCl and 84% for SO 2.
Met. The fly ash at this time was satisfactorily collected by a bag filter, and the waste gas temperature was 175 to 185 ° C. Further, there was no clogging in the pipe, and the dischargeability of the acid gas treating agent in the storage tank was good.
【００２０】実施例３
ＢＥＴ比表面積４８．９ｍ2／ｇ、ゆるみ見掛比重０．
２５ｇ／ｃｍ3、固め見掛比重０．４６ｇ／ｃｍ3、圧縮
度４５．７％、平均粒径２．９μｍである市販の高比表
面積水酸化カルシウムを、連続式振動ミル〔容器容積１
０００００ｃｍ 3、媒体（ＳＵＪ−２、φ１２ｍｍ、充
填率８０％）〕により加振力約７Ｇで処理した。得られ
た水酸化カルシウムの粉体物性を測定したところ、ＢＥ
Ｔ比表面積５６．７ｍ2／ｇ、ゆるみ見掛比重０．５８
ｇ／ｃｍ3、固め見掛比重０．８６ｇ／ｃｍ3、圧縮度３
２．６％、平均粒径８．６μｍであった。この粉体を酸
性ガス処理剤として用い、処理能力１２０ｔ／日のごみ
焼却炉の稼働時の廃ガス処理を行った。廃ガス処理塔の
廃ガス煙道入口における廃ガス中の酸性成分濃度はＨＣ
ｌが６５０ｐｐｍ、ＳＯ2が３９ｐｐｍであり、ＨＣｌ
とＳＯ2の入口合計量に対して酸性ガス処理剤を消石灰
の量が約１．８当量となるような割合で噴射した。塔出
口における酸性成分濃度はＨＣｌが２０ｐｐｍ、ＳＯ2
が９ｐｐｍであり、除去率はＨＣｌが９７％、ＳＯ2が
７７％であった。この際の飛灰の集塵はバグフィルター
で良好に行われ、また、廃ガス温度は１７５〜１８５℃
であった。また、配管中の目詰まりはなく、貯蔵タンク
内の酸性ガス処理剤の排出性は良好であった。Example 3
BET specific surface area 48.9m2/ G, loose apparent specific gravity of 0.
25 g / cm3, Solidified apparent specific gravity 0.46g / cm3,compression
High ratio table with a degree of 45.7% and an average particle size of 2.9 μm
A continuous vibrating mill [area of calcium hydroxide] [container volume 1
00000 cm 3, Medium (SUJ-2, φ12 mm, full
The filling rate was 80%)] and the vibration force was about 7 G. Obtained
The powder physical properties of calcium hydroxide were measured and found to be BE
T specific surface area 56.7 m2/ G, loose apparent specific gravity 0.58
g / cm3, Solidified apparent specific gravity 0.86g / cm3, Compression 3
The average particle size was 2.6% and the average particle size was 8.6 μm. Acid this powder
Used as a noble gas treatment agent, with a processing capacity of 120 t / day
Waste gas was treated when the incinerator was in operation. Waste gas treatment tower
The concentration of acidic components in the exhaust gas at the inlet of the exhaust gas flue is HC
l is 650ppm, SO2Is 39 ppm, and HCl
And SO2Slaked liquor with acid gas treatment agent to the total amount of inlet
Was sprayed at a rate such that the amount was about 1.8 equivalents. Tower
Concentration of acidic components in the mouth is 20 ppm for HCl, SO2
Is 9 ppm, and the removal rate is 97% for HCl and SO2But
It was 77%. The fly ash dust collected at this time is a bag filter
The exhaust gas temperature is 175-185 ° C.
Met. In addition, there is no clogging in the piping and the storage tank
The dischargeability of the acidic gas treating agent was good.
【００２１】[0021]
【発明の効果】本発明の水酸化カルシウムは、ＢＥＴ比
表面積が増大し、かつ見掛比重が大きい新規なものであ
って、酸性ガスとの反応性が向上し、廃ガス中の酸性ガ
ス成分を効率よく除去でき、使用量の減少、貯蔵タンク
からの排出時のトラブルの減少、貯蔵スペースの縮小及
び輸送コストの低減を可能にし、流動性が改良されて、
配管詰まりや排出不良などのトラブルが減少し、作業性
が向上するなど種々の利点を有する。また、このものを
有効成分とする酸性ガス処理剤は、ごみ焼却廃ガスなど
の廃ガスから効率よく酸性ガス成分を除去でき、反応性
の向上により使用量を減少させることができ、飛灰の減
容化に貢献しうるという利点を有する。INDUSTRIAL APPLICABILITY The calcium hydroxide of the present invention is a novel one having a large BET specific surface area and a large apparent specific gravity, has improved reactivity with an acidic gas, and is an acidic gas component in waste gas. Can be efficiently removed, the amount of use can be reduced, the trouble at the time of discharging from the storage tank can be reduced, the storage space can be reduced and the transportation cost can be reduced, and the fluidity can be improved.
It has various advantages such as reduced troubles such as clogging of pipes and defective discharge and improved workability. In addition, the acid gas treating agent containing this as an active ingredient can efficiently remove acid gas components from waste gas such as waste incineration waste gas, and can reduce the amount of use due to improved reactivity. It has an advantage that it can contribute to volume reduction.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 石原 正行 東京都羽村市緑ヶ丘５−10−１−103 Ｆターム(参考） 4D002 AA02 AA19 AB01 AC04 BA03 BA14 CA01 DA05 DA12 EA06 GA01 GB03 GB12 GB20 4G076 AA10 AB02 AC04 BA24 BA45 BD02 CA26 CA27 CA28 DA29 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Masayuki Ishihara 5-10-1-103 Midorigaoka, Hamura-shi, Tokyo F-term (reference) 4D002 AA02 AA19 AB01 AC04 BA03 BA14 CA01 DA05 DA12 EA06 GA01 GB03 GB12 GB20 4G076 AA10 AB02 AC04 BA24 BA45 BD02 CA26 CA27 CA28 DA29
Claims (3)
０．４ｇ／ｃｍ3以上のゆるみ見掛比重、及び０．７ｇ
／ｃｍ3以上の固め見掛比重を有する水酸化カルシウ
ム。1. A BET specific surface area of 45 m 2 / g or more,
Loose apparent specific gravity of 0.4 g / cm 3 or more, and 0.7 g
Calcium hydroxide having a solidified apparent specific gravity of not less than / cm 3 .
積が少なくとも３５ｍ2／ｇ以上の水酸化カルシウムを
調製し、次いでこれに粉砕と圧密造粒の処理を単独の装
置で施すことを特徴とする、請求項１記載の水酸化カル
シウムの製造方法。2. A method of digesting calcium oxide to prepare calcium hydroxide having a BET specific surface area of at least 35 m 2 / g, and then subjecting this to pulverization and consolidation granulation in a single apparatus. The method for producing calcium hydroxide according to claim 1.
成分とする酸性ガス処理剤。3. An acid gas treating agent containing the calcium hydroxide according to claim 1 as an active ingredient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22981898A JP4194001B2 (en) | 1998-08-14 | 1998-08-14 | Acid gas treatment agent and waste gas treatment method using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22981898A JP4194001B2 (en) | 1998-08-14 | 1998-08-14 | Acid gas treatment agent and waste gas treatment method using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000063116A true JP2000063116A (en) | 2000-02-29 |
| JP4194001B2 JP4194001B2 (en) | 2008-12-10 |
Family
ID=16898158
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22981898A Expired - Lifetime JP4194001B2 (en) | 1998-08-14 | 1998-08-14 | Acid gas treatment agent and waste gas treatment method using the same |
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| Country | Link |
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| JP (1) | JP4194001B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002029738A (en) * | 2000-07-18 | 2002-01-29 | Okutama Kogyo Co Ltd | Calcium hydroxide and acidic gas treating agent by using the same |
| JP2003093837A (en) * | 2001-09-26 | 2003-04-02 | Okutama Kogyo Co Ltd | Exhaust gas treatment agent |
| JP2007000721A (en) * | 2005-06-22 | 2007-01-11 | Hokkaido Kyodo Sekkai Kk | Flue gas treatment method and production method of flue gas treatment agent |
| JP2007302555A (en) * | 2007-06-26 | 2007-11-22 | Kaisui Kagaku Kenkyusho:Kk | Calcium hydroxide-based compound and its producing method |
| JP2008255007A (en) * | 2008-05-26 | 2008-10-23 | Ube Material Industries Ltd | High reactive slaked lime |
| JP2015085303A (en) * | 2013-11-01 | 2015-05-07 | 栗田工業株式会社 | Treatment method of acidic exhaust gas and exhaust gas treatment agent |
| CN114950096A (en) * | 2022-07-29 | 2022-08-30 | 大唐环境产业集团股份有限公司 | Calcium hydroxide dechlorinating agent and preparation method and application thereof |
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| JP7272382B2 (en) | 2021-03-17 | 2023-05-12 | 栗田工業株式会社 | Combustion exhaust gas treatment method and combustion exhaust gas treatment device |
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1998
- 1998-08-14 JP JP22981898A patent/JP4194001B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002029738A (en) * | 2000-07-18 | 2002-01-29 | Okutama Kogyo Co Ltd | Calcium hydroxide and acidic gas treating agent by using the same |
| JP2003093837A (en) * | 2001-09-26 | 2003-04-02 | Okutama Kogyo Co Ltd | Exhaust gas treatment agent |
| JP2007000721A (en) * | 2005-06-22 | 2007-01-11 | Hokkaido Kyodo Sekkai Kk | Flue gas treatment method and production method of flue gas treatment agent |
| JP2007302555A (en) * | 2007-06-26 | 2007-11-22 | Kaisui Kagaku Kenkyusho:Kk | Calcium hydroxide-based compound and its producing method |
| JP2008255007A (en) * | 2008-05-26 | 2008-10-23 | Ube Material Industries Ltd | High reactive slaked lime |
| JP2015085303A (en) * | 2013-11-01 | 2015-05-07 | 栗田工業株式会社 | Treatment method of acidic exhaust gas and exhaust gas treatment agent |
| CN114950096A (en) * | 2022-07-29 | 2022-08-30 | 大唐环境产业集团股份有限公司 | Calcium hydroxide dechlorinating agent and preparation method and application thereof |
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| Publication number | Publication date |
|---|---|
| JP4194001B2 (en) | 2008-12-10 |
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