JP4799470B2 - Method for producing slaked lime slurry - Google Patents
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- JP4799470B2 JP4799470B2 JP2007108634A JP2007108634A JP4799470B2 JP 4799470 B2 JP4799470 B2 JP 4799470B2 JP 2007108634 A JP2007108634 A JP 2007108634A JP 2007108634 A JP2007108634 A JP 2007108634A JP 4799470 B2 JP4799470 B2 JP 4799470B2
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- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 title claims description 62
- 239000000920 calcium hydroxide Substances 0.000 title claims description 62
- 235000011116 calcium hydroxide Nutrition 0.000 title claims description 62
- 229910001861 calcium hydroxide Inorganic materials 0.000 title claims description 62
- 239000002002 slurry Substances 0.000 title claims description 32
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 41
- 239000000292 calcium oxide Substances 0.000 claims description 26
- 235000012255 calcium oxide Nutrition 0.000 claims description 26
- 230000029087 digestion Effects 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 3
- 230000020169 heat generation Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 13
- 239000000843 powder Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000001035 drying Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 230000002378 acidificating effect Effects 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000001079 digestive effect Effects 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000004056 waste incineration Methods 0.000 description 2
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- -1 alcohol amines Chemical class 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 238000000209 wet digestion Methods 0.000 description 1
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Description
本発明は、消石灰スラリー特にごみ焼却施設において発生する酸性排ガスの中和処理剤として好適な消石灰スラリーの製造方法に関するものである。 The present invention relates to a method for producing a slaked lime slurry suitable as a neutralizing agent for acidic exhaust gas generated in a slaked lime slurry, particularly a waste incineration facility.
ごみ焼却施設において発生する酸性排ガスの処理法として、消石灰スラリーを排ガス中に噴霧する、いわゆる半乾式法（Ｓｅｍｉ−ｗｅｔ ｐｒｏｃｅｓｓ）が知られている。そして、この際、中和用として使用される消石灰スラリーは、通常消化工程において生石灰を消化して生成させた消石灰を乾燥工程でいったん乾燥して粉末としたのち、これを水と混合することにより調製されている。 As a method for treating acidic exhaust gas generated in a waste incineration facility, a so-called semi-dry process (Semi-wet process) in which slaked lime slurry is sprayed into exhaust gas is known. At this time, the slaked lime slurry used for neutralization is obtained by once drying the slaked lime produced by digesting quick lime in the normal digestion process into a powder and then mixing it with water. Has been prepared.
そして、このようにして用いる消石灰の活性を向上させるための方法として、酸化カルシウム１重量部に対し消化水２〜１０重量部を加えて水和反応させて水酸化カルシウムのスラリーを形成させたのち、このスラリーを加圧ろ過して含水率５０％以下のケーキとし、これを解砕しながら熱ガスで乾燥し、粉末化する方法（特許文献１参照）、粉末状生石灰を消化に必要な理論量の１．５質量倍以上の水に接触させて消化する際に、この水に、生成する消石灰の量の０．８〜３質量％に相当する量のエチレングリコールを含ませて消化して含水率５〜３０質量％の含水消石灰を得た後、乾燥してＢＥＴ比表面積５０ｍ2／ｇ以上の高活性消石灰とする方法（特許文献２参照）、粉末状生石灰に、オキシカルボン酸又はその塩、糖類、糖アルコール、アルコール類、アミン類、アルコールアミン、コハク酸、金属コハク酸及びリグニンスルホン酸塩の中から選ばれた水溶性化合物を含む消化水を、生石灰の消化に必要な理論量の１．５〜５質量倍の消化水と接触させて消化を行い、含水率３５〜５５質量％の高含水消石灰を生成させたのち、これを乾燥して比表面積３０ｍ2／ｇ以上、直径２０〜１０００Åの範囲にある全細孔の容積が０．３０ｍｌ／ｇ以上の多孔質消石灰とする方法（特許文献３参照）などが提案されている。 And as a method for improving the activity of the slaked lime used in this way, after adding 2 to 10 parts by weight of digested water to 1 part by weight of calcium oxide, a hydration reaction is carried out to form a calcium hydroxide slurry. The slurry is subjected to pressure filtration to obtain a cake having a water content of 50% or less, and this is pulverized, dried with hot gas and pulverized (see Patent Document 1), theory necessary for digestion of powdered quicklime When it is digested by bringing it into contact with more than 1.5 mass times the amount of water, this water is digested with an amount of ethylene glycol corresponding to 0.8 to 3% by mass of the amount of slaked lime produced. After obtaining hydrous slaked lime having a water content of 5 to 30% by mass, drying to obtain highly active slaked lime having a BET specific surface area of 50 m 2 / g or more (see Patent Document 2), powdered quick lime, oxycarboxylic acid or its Salt, sugar, sugar arco Digestive water containing a water-soluble compound selected from the group consisting of water, alcohols, amines, alcohol amines, succinic acid, metal succinic acid and lignin sulfonate is 1.5 to the theoretical amount necessary for digestion of quicklime. Digestion is carried out by bringing it into contact with 5 mass times digestion water to produce a highly hydrous slaked lime having a moisture content of 35 to 55% by mass, and then dried to have a specific surface area of 30 m 2 / g or more and a diameter of 20 to 1000 kg. A method of making porous slaked lime having a total pore volume of 0.30 ml / g or more (see Patent Document 3) has been proposed.
しかしながら、このようにして高活性化した消石灰粉末を水と混合してスラリー化すると、折角活性度を高めたにもかかわらず、スラリー化前に比べてＢＥＴ比表面積が２０〜３０％減少し、活性度が低下するのを免れない。 However, when slaked lime powder highly activated in this way is mixed with water to form a slurry, the BET specific surface area is reduced by 20 to 30% compared to before slurrying, despite the increase in the corner angle activity, It is inevitable that the activity will decrease.
本発明は、生石灰を消化し、乾燥して得た消石灰粉末を用いて、例えば酸性排ガスの中和処理剤として使用するための消石灰スラリーを調製する際に伴う消石灰粉末粒子のＢＥＴ比表面積の減少を防止し、高活性を維持することを目的としてなされたものである。 The present invention reduces the BET specific surface area of slaked lime powder particles when preparing slaked lime slurry for use as a neutralizing agent for acidic exhaust gas, for example, by using slaked lime powder obtained by digesting and drying quick lime It was made for the purpose of preventing the above and maintaining high activity.
本発明者らは、高活性の消石灰を用いて活性低下なしに消石灰スラリーを調製する方法について種々研究を重ねた結果、生石灰を消化する際の消化水の使用量を少なくして、含有水分の少ない含水消石灰を生成させ、これを乾燥することなく、そのまま水と混合してスラリー化することにより、スラリー化前の消石灰粒子のＢＥＴ比表面積を低下させることなく、消化スラリーを調製しうることを見出し、この知見に基づいて本発明をなすに至った。 The present inventors have conducted various studies on a method for preparing a slaked lime slurry without reducing the activity using highly active slaked lime. As a result, the amount of digested water used when digesting quick lime is reduced, It is possible to prepare a digested slurry without reducing the BET specific surface area of the slaked lime particles before slurrying by generating a small amount of hydrous slaked lime and mixing it with water as it is to make a slurry without drying it. Based on the finding and this finding, the present invention has been made.
すなわち、本発明は、生石灰を消化して得た消石灰を水と混合して消石灰スラリーを製造するに当り、生石灰１００質量部に対して消化水７５〜１４０質量部を加えて、含有水分が１５〜３０質量％の含水消石灰が得られるまで消化したのち、得られた含水消石灰に水を加えてスラリー化することを特徴とする消石灰スラリーの製造方法を提供するものである。 That is, in the present invention, when slaked lime obtained by digesting quick lime is mixed with water to produce a slaked lime slurry, 75 to 140 parts by mass of digested water is added to 100 parts by mass of quick lime, and the water content is 15 The present invention provides a method for producing a slaked lime slurry characterized by digesting until -30% by mass of hydrous slaked lime is obtained, and then adding water to the obtained hydrous slaked lime to form a slurry.
本発明方法において、原料として用いる生石灰は、消石灰の製造に際して慣用されている粉末状又は粒状の生石灰を用いることができる。
そして、これまで知られている湿式消化法においては、生石灰１００質量部当り、消化水２００〜１０００質量部を用いるのが普通であるが、本発明方法においては、生石灰１００質量部当り消化水７５〜１４０質量部を用い、含有水分１５〜３０質量％の含水消石灰が得られまで消化させることが必要である。
In the method of the present invention, quick lime used as a raw material can be powdered or granular quick lime conventionally used in the production of slaked lime.
In the conventional wet digestion method, it is usual to use 200 to 1000 parts by mass of digested water per 100 parts by mass of quick lime, but in the method of the present invention, 75 parts of digested water per 100 parts by mass of quick lime. Using ~ 140 parts by mass, it is necessary to digest until a hydrous slaked lime having a water content of 15 to 30% by mass is obtained.
生石灰１００質量部当りのこの消化水の量が７５質量部よりも少ないと十分な比表面積が得られないし、また消化水の量があまり多くなると取り扱いしにくくなる。本発明方法において好適な消化水の量は、生石灰１００質量部当り９０〜１１０質量部の範囲内である。 If the amount of digested water per 100 parts by weight of quicklime is less than 75 parts by weight, a sufficient specific surface area cannot be obtained, and if the amount of digested water is too large, handling becomes difficult. The amount of digestion water suitable in the method of the present invention is in the range of 90 to 110 parts by mass per 100 parts by mass of quicklime.
この粉末状又は粒状の生石灰の粒度としては、平均粒径１０〜５００μｍ、好ましくは５０〜１５０μｍの範囲で選ばれる。これよりも粒度を小さくすると取り扱いがむずかしくなる上にコスト高になるのを免れないし、また、これよりも粒度が大きくなると反応速度が遅くなり、好ましくない。
また、高比表面積の消石灰を得るためには、生石灰の活性が高いことが重要である。本発明において、生石灰の活性は欧州域内規格（ＥＮ規格）４５９−２で示される消化発熱速度（ｔu）を用いて規定した。生石灰のｔuとしては、５分以下の範囲で選ばれる。５分より大きい場合は反応速度が低下するために、比較的粗大な１次粒子が生成し、高比表面積の消石灰を得るには不利である。
この消化水には、比表面積を向上させるために炭酸ナトリウム、炭酸カリウム、クエン酸や酒石酸又はそれらの水溶性塩、ソルビトール、プロピレングリコール、ジエチレングリコールなどを含ませることができる。これらの添加剤の量としては、生成する消石灰の量に基づき、０．５〜３質量％、好ましくは１．０〜２．０質量％の範囲内で選ばれる。
The particle size of the powdered or granular quicklime is selected in the range of an average particle size of 10 to 500 μm, preferably 50 to 150 μm. If the particle size is smaller than this, the handling becomes difficult and the cost is inevitable, and if the particle size is larger than this, the reaction rate becomes slow, which is not preferable.
Moreover, in order to obtain slaked lime with a high specific surface area, it is important that the activity of quicklime is high. In the present invention, the activity of quicklime is defined using the digestive fever rate (t u ) indicated by European regional standard (EN standard) 459-2. The quicklime t u, is selected in the range of less than 5 minutes. When the time is longer than 5 minutes, the reaction rate is lowered, so that relatively coarse primary particles are generated, which is disadvantageous for obtaining slaked lime having a high specific surface area.
This digested water can contain sodium carbonate, potassium carbonate, citric acid, tartaric acid or their water-soluble salts, sorbitol, propylene glycol, diethylene glycol, and the like in order to improve the specific surface area. The amount of these additives is selected within the range of 0.5 to 3% by mass, preferably 1.0 to 2.0% by mass, based on the amount of slaked lime produced.
本発明方法において用いる消石灰は、次のようにして調製することができる。
すなわち、粉末状又は粒状の生石灰１００質量部に対して、消化水又は所望に応じて比表面積向上のための添加剤を含む消化水７５〜１４０質量部を加え、消化を行わせ、含有水分１５〜３０質量％、好ましくは２０〜２５質量％の消石灰を生成させる。この消化に要する時間は通常１０〜３０時間である。
この際の消化発熱速度は５分以下、好ましくは３０秒〜２分の範囲にする。
Slaked lime used in the method of the present invention can be prepared as follows.
That is, with respect to 100 parts by mass of powdered or granular quicklime, 75 to 140 parts by mass of digestion water or digestion water containing an additive for improving the specific surface area as required is added to cause digestion, and the moisture content is 15 -30% by mass, preferably 20-25% by mass of slaked lime is produced. The time required for this digestion is usually 10 to 30 hours.
In this case, the digestion heat generation rate is 5 minutes or less, preferably 30 seconds to 2 minutes.
このようにして得られた消石灰を１００〜１１０℃において１５時間以上、好ましくは２４時間以上乾燥したものは、４０ｍ2／ｇ以上のＢＥＴ比表面積を有する。 The slaked lime thus obtained is dried at 100 to 110 ° C. for 15 hours or more, preferably 24 hours or more, and has a BET specific surface area of 40 m 2 / g or more.
本発明方法においては、上記のようにして得た含有水分１５〜３０質量％の含水消石灰を乾燥することなく、これに水を加えて消石灰スラリーを調製する。この際のスラリー濃度は通常２０〜３５質量％である。 In the method of the present invention, slaked lime slurry is prepared by adding water to the hydrated slaked lime having a water content of 15 to 30% by mass obtained as described above without drying. The slurry concentration at this time is usually 20 to 35% by mass.
そして、従来方法に従い、消化した水分含有消石灰を、いったん乾燥して得た消石灰粉末に水を加えてスラリー化すると、スラリー化する前の消石灰粒子のＢＥＴ比表面積が２０〜３０％程度減少し、活性が低下するにもかかわらず、消化により得られる含水消石灰を乾燥することなく、そのまま水を加えてスラリー化すると消石灰粒子の高いＢＥＴ比表面積を維持したままスラリー化することができる。 And according to the conventional method, when the water-containing slaked lime digested is slurried by adding water to the slaked lime powder obtained once dried, the BET specific surface area of the slaked lime particles before slurrying is reduced by about 20 to 30%, In spite of the decrease in activity, the water-containing slaked lime obtained by digestion can be made into a slurry while maintaining the high BET specific surface area of the slaked lime particles by adding water as it is to make a slurry without drying.
本発明方法によると、乾燥消石灰粉末を用いてスラリーを調製する際の、消石灰粒子の比表面積の低下を生じることなく、スラリー形成前の消石灰粒子の比表面積を維持したまま、消石灰スラリーを製造することができる。 According to the method of the present invention, a slaked lime slurry is produced while maintaining the specific surface area of the slaked lime particles before forming the slurry without causing a decrease in the specific surface area of the slaked lime particles when preparing the slurry using the dried slaked lime powder. be able to.
次に、実施例により、本発明を実施するための最良の形態を説明するが、本発明はこれによりなんら限定されるものではない。なお、各例中の含水量及びＢＥＴ比表面積は、次のようにして測定した。 Next, the best mode for carrying out the present invention will be described by way of examples, but the present invention is not limited thereto. In addition, the water content and BET specific surface area in each example were measured as follows.
（１）含水量；試料１０ｇを分取し、２００℃で１．５時間真空乾燥し、減量分を百分比で表わし、含水量とした。
（２）ＢＥＴ比表面積；ＢＥＴ比表面積計（島津製作所製、製品名「フローソープＩＩ ２３００」）を用い、試料０．２ｇを、あらかじめ２００℃で窒素を１時間通じながら脱気乾燥したものについて、測定した。
(1) Water content: 10 g of a sample was collected and vacuum dried at 200 ° C. for 1.5 hours, and the weight loss was expressed as a percentage.
(2) BET specific surface area: About BET specific surface area meter (manufactured by Shimadzu Corporation, product name “Flow Soap II 2300”), 0.2 g of sample was deaerated and dried while passing nitrogen at 200 ° C. for 1 hour in advance. ,It was measured.
参考例
生石灰を焼成し、焼成物を粉砕したのち、２００メッシュ通過部分（平均粒径３５μｍ）を捕集して原料生石灰として用いた。
上記の生石灰１００質量部に消化水１００質量部を加え、高速でかきまぜながら、２４時間消化を行うことにより、含水量２０．５質量％の消石灰を得た。この際の消化発熱速度は１分であった。
Reference Example After calcining quick lime and pulverizing the fired product, a 200-mesh passing portion (average particle size 35 μm) was collected and used as raw quick lime.
100 mass parts of digestion water was added to 100 mass parts of the above-mentioned quick lime, and digestion was performed for 24 hours while stirring at high speed to obtain slaked lime having a water content of 20.5 mass%. The digestion exotherm rate at this time was 1 minute.
参考例で得た消石灰１００ｇを２０℃の水１０００ｍｌに溶解し、かきまぜ機により３００ｒｐｍで１時間かきまぜた。
次いで、ヌッチェを用いてろ過することにより、濃度９．１質量％の消石灰スラリーを調製した。このスラリーの１０ｍｌを分取し、１０５℃のオーブンに入れ、２４時間乾燥した。このようにして得た消石灰粉末のＢＥＴ比表面積を測定したところ、４０．１ｍ2／ｇであった。
100 g of slaked lime obtained in the reference example was dissolved in 1000 ml of water at 20 ° C. and stirred for 1 hour at 300 rpm by a stirrer.
Subsequently, the slaked lime slurry with a density | concentration of 9.1 mass% was prepared by filtering using Nutsche. 10 ml of this slurry was collected and placed in an oven at 105 ° C. and dried for 24 hours. The BET specific surface area of the slaked lime powder thus obtained was measured and found to be 40.1 m 2 / g.
比較例
参考例で得た消石灰を、ケージミルで解砕しながら、４００℃の熱風で１時間乾燥した。このようにして得た乾燥後の消石灰粉末のＢＥＴ比表面積は４２．３ｍ2／ｇであった。この消石灰粉末１００ｇに２０℃の水１０００ｍｌを加えて消石灰スラリーを調製した。このスラリー１０ｍｌを分取し、実施例と同様にして乾操したのち、得られた消石灰についてＢＥＴ比表面積を測定したところ、３３．６ｍ2／ｇであった。
Comparative Example The slaked lime obtained in the reference example was dried with hot air at 400 ° C. for 1 hour while being crushed with a cage mill. The BET specific surface area of the dried slaked lime powder thus obtained was 42.3 m 2 / g. To 100 g of this slaked lime powder, 1000 ml of 20 ° C. water was added to prepare a slaked lime slurry. 10 ml of this slurry was collected and dried in the same manner as in the Example, and the BET specific surface area of the obtained slaked lime was measured to be 33.6 m 2 / g.
本発明方法により得られる消石灰スラリーは、特に都市ごみ焼却炉から排出される排ガス中の有害酸性物質を除去するのに好適である。 The slaked lime slurry obtained by the method of the present invention is particularly suitable for removing harmful acidic substances in exhaust gas discharged from municipal waste incinerators.
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