JP2006273600A - Adhesion-suppressed slaked lime - Google Patents
Adhesion-suppressed slaked lime Download PDFInfo
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- JP2006273600A JP2006273600A JP2005090828A JP2005090828A JP2006273600A JP 2006273600 A JP2006273600 A JP 2006273600A JP 2005090828 A JP2005090828 A JP 2005090828A JP 2005090828 A JP2005090828 A JP 2005090828A JP 2006273600 A JP2006273600 A JP 2006273600A
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- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 title claims abstract description 120
- 239000000920 calcium hydroxide Substances 0.000 title claims abstract description 120
- 235000011116 calcium hydroxide Nutrition 0.000 title claims abstract description 120
- 229910001861 calcium hydroxide Inorganic materials 0.000 title claims abstract description 120
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 82
- 230000000694 effects Effects 0.000 claims abstract description 54
- 239000000292 calcium oxide Substances 0.000 claims abstract description 41
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 41
- 239000000654 additive Substances 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 16
- 150000002169 ethanolamines Chemical class 0.000 claims abstract description 6
- 150000002334 glycols Chemical class 0.000 claims abstract description 6
- 239000010455 vermiculite Substances 0.000 claims abstract description 5
- 229910052902 vermiculite Inorganic materials 0.000 claims abstract description 5
- 235000019354 vermiculite Nutrition 0.000 claims abstract description 5
- 230000002401 inhibitory effect Effects 0.000 claims description 6
- 239000010451 perlite Substances 0.000 claims description 2
- 235000019362 perlite Nutrition 0.000 claims description 2
- 229910001562 pearlite Inorganic materials 0.000 abstract description 5
- 230000000996 additive effect Effects 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 10
- 239000002994 raw material Substances 0.000 description 8
- 230000001629 suppression Effects 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 238000010304 firing Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 235000019738 Limestone Nutrition 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- 239000006028 limestone Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000911 decarboxylating effect Effects 0.000 description 1
- 230000001079 digestive effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- -1 glycol ethers Chemical class 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
本発明は、酸性物質の中和剤や排煙、排水中の酸除去剤として利用されるほか、各種化学工業の反応用アルカリとして一般的に用いられ、汎用消石灰に比べて流動性に優れ、かつ付着性を低減することができる付着抑制型消石灰に関するものである。 The present invention is used as a neutralizing agent and flue gas for acid substances, as an acid removing agent in wastewater, and is generally used as a reaction alkali in various chemical industries, and has excellent fluidity compared to general-purpose slaked lime, And it is related with the adhesion suppression type | mold slaked lime which can reduce adhesiveness.
ごみ焼却場等において発生する酸性ガス等の排ガス処理用途として使用される消石灰として、輸送時の配管への付着や配管閉塞などの問題が少ない消石灰が望まれている。特に、一般的に使用されている汎用消石灰においては、輸送や貯蔵、圧送時における配管等への付着や流動性不良の問題が存在する。従って、汎用消石灰を使用する際、輸送配管の維持管理などには多くの人的負担やコストが必要とされる。
上記諸問題を解決する方策として、消石灰、粉末生石灰及び、グリコール類、グリコールエーテル類又はエタノールアミン類から選択された少なくとも1種の添加剤からなり、前記の消石灰と粉末生石灰の重量割合が、98:2〜70:30である改質した低付着性消石灰が提案されている(例えば、特許文献1参照。)。また、付着性を改善する添加剤としてパーライトを含む付着性改善消石灰が提案されている(例えば、特許文献2参照。)。
As a measure for solving the above problems, slaked lime, powdered quicklime, and at least one additive selected from glycols, glycol ethers or ethanolamines, the weight ratio of the slaked lime and powdered quicklime is 98. : 2 to 70:30 modified low adhesion slaked lime has been proposed (for example, see Patent Document 1). Moreover, the adhesive improvement slaked lime containing pearlite is proposed as an additive which improves adhesiveness (for example, refer patent document 2).
しかしながら、特許文献1又は2に示される消石灰では、一定の付着抑制効果は得られているが、添加剤を必ず加える必要があるため汎用消石灰に比べてコストが上昇してしまうこと、また用途によっては使用が制限されるなどの問題があり、更なる改良が要望されていた。また、上記特許文献1又は2に示される消石灰では流動性不良の問題点については、十分に解消されているとはいえなかった。
本発明の目的は、汎用消石灰に比べて流動性に優れ、かつ付着性を低減し得る付着抑制型消石灰を提供することにある。
However, in the slaked lime shown in Patent Document 1 or 2, a certain adhesion suppression effect is obtained, but since it is necessary to always add an additive, the cost is increased compared to general-purpose slaked lime, and depending on the use However, there is a problem that the use is limited, and further improvement has been demanded. Moreover, it cannot be said that the problem of fluidity | liquidity is fully solved in the slaked lime shown by the said patent document 1 or 2.
The objective of this invention is providing the adhesion suppression type | mold slaked lime which is excellent in fluidity | liquidity compared with general purpose slaked lime, and can reduce adhesiveness.
請求項1に係る発明は、活性度が20〜150mlの低活性生石灰を消化して得られた消石灰からなることを特徴とする付着抑制型消石灰である。
請求項2に係る発明は、活性度が20〜150mlの低活性生石灰を消化して得られた消石灰を40重量%以上の割合で含むことを特徴とする付着抑制型消石灰である。
請求項1又は2に係る発明では、活性度が20〜150mlの低活性生石灰を消化して得られた消石灰を使用しているので、高活性の生石灰を消化して得られた汎用消石灰に比べて流動性に優れ、かつ付着性を低減することができる。
The invention according to claim 1 is an adhesion-inhibiting slaked lime comprising slaked lime obtained by digesting low-activity quicklime having an activity of 20 to 150 ml.
The invention according to claim 2 is an adhesion-inhibiting slaked lime comprising 40% by weight or more of slaked lime obtained by digesting low-activity quicklime having an activity of 20 to 150 ml.
In the invention according to claim 1 or 2, since slaked lime obtained by digesting low-activity quicklime with an activity of 20 to 150 ml is used, compared with general-purpose slaked lime obtained by digesting highly active quicklime. In addition, the fluidity is excellent and the adhesion can be reduced.
請求項3に係る発明は、請求項1又は2に係る発明であって、グリコール類及びエタノールアミン類からなる群より選ばれた1種又は2種以上の添加剤を消石灰100重量%に対して0.1〜5重量%の割合で添加する付着抑制型消石灰である。
請求項3に係る発明では、消石灰に上記添加剤を添加することにより、付着抑制効果が一層促進される。
The invention according to claim 3 is the invention according to claim 1 or 2, wherein one or more additives selected from the group consisting of glycols and ethanolamines are added to 100% by weight of slaked lime. It is adhesion suppression type | mold slaked lime added in the ratio of 0.1 to 5 weight%.
In the invention which concerns on Claim 3, the adhesion inhibitory effect is further accelerated | stimulated by adding the said additive to slaked lime.
請求項4に係る発明は、請求項1ないし3いずれか1項に係る発明であって、シラスバルーン、バーミキュライト及びパーライトからなる群より選ばれた1種又は2種以上の無機粉体を消石灰100重量%に対して0.5〜5重量%の割合で添加する付着抑制型消石灰である。
請求項4に係る発明では、消石灰に上記無機粉体を添加することにより、流動性や付着性が更に改善される。
The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein one or more inorganic powders selected from the group consisting of shirasu balloon, vermiculite and perlite are used as slaked lime 100. It is the adhesion suppression type | mold slaked lime added in the ratio of 0.5-5 weight% with respect to weight%.
In the invention which concerns on Claim 4, fluidity | liquidity and adhesiveness are further improved by adding the said inorganic powder to slaked lime.
本発明の付着抑制型消石灰は、原料として活性度が20〜150mlの低活性生石灰を消化して得られた消石灰を使用しているので、高活性の生石灰を消化して得られた汎用消石灰に比べて流動性に優れ、かつ付着性を低減することができる。また、消石灰に添加剤を所定の割合で添加する、或いは消石灰に無機粉体を所定の割合で添加することによって、付着性や流動性が更に改善され、これにより消石灰の輸送時における配管への付着や貯蔵時の排出性などの問題を大幅に解消することが可能となる。 The adhesion-suppressed slaked lime of the present invention uses slaked lime obtained by digesting low-activity quick lime having an activity of 20 to 150 ml as a raw material, so that the general-purpose slaked lime obtained by digesting highly active quick lime is used. Compared with the fluidity, the adhesiveness can be reduced. In addition, by adding an additive to slaked lime at a predetermined ratio, or by adding an inorganic powder to the slaked lime at a predetermined ratio, the adhesion and fluidity are further improved. Problems such as adhesion and discharge during storage can be greatly eliminated.
次に本発明を実施するための最良の形態を説明する。
本発明の付着抑制型消石灰は、活性度が20〜150ml、好ましくは40〜100mlの低活性生石灰を消化して得られた消石灰からなることを特徴とする。本発明における活性度とは、粒度10〜3mmの生石灰50gをフェノールフタレイン指示薬2〜3滴を滴下した水2リットル中に投入し、攪拌しながら4規定の塩酸を滴下し続け、溶液が僅かに赤色を呈する状態を維持して、5分間経過したときの塩酸消費量(単位:ml)をいう。上記条件での塩酸消費量が多いほど活性が高いことを示す。
Next, the best mode for carrying out the present invention will be described.
The adhesion-suppressing slaked lime of the present invention is characterized by comprising slaked lime obtained by digesting low-activity quicklime having an activity of 20 to 150 ml, preferably 40 to 100 ml. The activity in the present invention means that 50 g of quick lime having a particle size of 10 to 3 mm is put into 2 liters of water in which 2 to 3 drops of phenolphthalein indicator is dropped, and 4N hydrochloric acid is continuously added dropwise with stirring. The amount of hydrochloric acid consumption (unit: ml) when 5 minutes have elapsed while maintaining a red state. It shows that activity is so high that there is much hydrochloric acid consumption in the said conditions.
汎用されている消石灰の製造においては、通常、原料である生石灰に対して重量比で約65%程度の水を加え、水和することで製造されるが、原料である消石灰は、一般的には活性度が250ml以上の活性度の高いものが用いられている。一方、活性度が150ml以下の低活性生石灰は、通常ALC用原料や静的破砕材原料等として用いられる。本発明の付着抑制型消石灰は、低活性の生石灰により製造した消石灰の流動性や付着性が、前述した高活性の生石灰により製造した汎用消石灰に比べ、非常に優れていることに着目し発明に至ったものである。活性度を上記範囲内に規定したのは、活性度が上限値を越える生石灰は、この生石灰を用いて製造した消石灰の流動性や付着性に劣り、活性度が下限値未満では生石灰或いは消石灰製造時の経済的コストが大きくなるためである。消石灰の流動性や付着性において十分な効果を得るため、また経済的コスト等を考慮すると、原料である生石灰の活性度は40〜100mlが好ましい。 In the production of slaked lime that is widely used, it is usually produced by adding about 65% water by weight to the raw lime, which is a raw material, and hydrated. High activity with an activity of 250 ml or more is used. On the other hand, low activity quicklime having an activity of 150 ml or less is usually used as a raw material for ALC, a raw material for static crushing material, or the like. In the invention, the adhesion-suppressed slaked lime of the present invention focuses on the fact that the fluidity and adhesion of slaked lime produced with low activity quick lime is very superior to the general-purpose slaked lime produced with high activity quick lime described above. It has come. The activity is regulated within the above range because quick lime whose activity exceeds the upper limit is inferior in fluidity and adhesion of slaked lime produced using this quick lime, and when the activity is less than the lower limit, quick lime or slaked lime is produced. This is because the economic cost of time increases. In order to obtain a sufficient effect in the flowability and adhesion of slaked lime, and considering economic costs, the activity of quick lime as a raw material is preferably 40 to 100 ml.
消石灰の原料である生石灰は、石灰石を堅炉又はキルン等の焼成炉、或いは電気炉等により焼成し、脱炭酸して得られる。生石灰の活性度は元の石灰石の性状やサイズ或いは焼成温度や焼成時間、焼成雰囲気等の条件等で変わるが、前述した汎用消石灰の原料となっている生石灰は、900℃以上1100℃未満の温度で2〜3時間焼成することにより得られ、生石灰結晶粒子の発達が小さく空隙率が比較的大きいもので、250〜400ml程度と高い活性度を示す。一方、本発明に用いる低活性の生石灰は、上記焼成温度より高温の1100℃〜1200℃で1〜3時間焼成することにより得られ、生石灰結晶粒子の発達が大きく空隙率が小さいものとなり、活性度20〜150mlと低活性の生石灰が得られる。 Quick lime, which is a raw material for slaked lime, is obtained by calcining limestone in a firing furnace such as a hard furnace or kiln, or an electric furnace, and decarboxylating. The activity of quicklime varies depending on the properties and size of the original limestone, the firing temperature, the firing time, the firing atmosphere, etc. The quicklime used as the raw material for the above-mentioned general-purpose slaked lime has a temperature of 900 ° C. or higher and lower than 1100 ° C. It is obtained by baking for 2 to 3 hours, has a small development of quick lime crystal particles and a relatively large porosity, and exhibits a high activity of about 250 to 400 ml. On the other hand, the low activity quick lime used in the present invention is obtained by firing for 1 to 3 hours at 1100 ° C. to 1200 ° C., which is higher than the above firing temperature, and the development of quick lime crystal particles is large and the porosity is small. A quick lime having a low activity of 20 to 150 ml is obtained.
また、本発明の別の付着抑制型消石灰としては、活性度が20〜150mlの低活性生石灰を消化して得られた消石灰を40重量%以上の割合で含むことを特徴とする。低活性生石灰を消化して得られた消石灰を前述した汎用消石灰と所定の割合で混合することができ、用途に併せて、使い分けすることができる。このうち、流動性や付着性で実用的な効果を得るために、低活性生石灰から得られた消石灰を60重量%以上の割合で含むことが好ましく、60〜80重量%の割合で含むことが特に好ましい。 Moreover, as another adhesion suppression type | mold slaked lime of this invention, the slaked lime obtained by digesting the low activity quick lime whose activity is 20-150 ml is included in the ratio of 40 weight% or more. Slaked lime obtained by digesting low-active quicklime can be mixed with the above-mentioned general-purpose slaked lime at a predetermined ratio, and can be properly used according to the application. Among these, in order to obtain practical effects with fluidity and adhesion, it is preferable to include slaked lime obtained from low-active quicklime in a proportion of 60% by weight or more, and in a proportion of 60 to 80% by weight. Particularly preferred.
また、本発明の付着抑制型消石灰に、グリコール類及びエタノールアミン類からなる群より選ばれた1種又は2種以上の添加剤を消石灰100重量%に対して0.1〜5重量%の割合で添加しても良い。消石灰に上記添加剤を所定の割合で添加することにより、付着抑制効果が一層促進される。グリコール類としては、ジエチレングリコールやエチレングリコールが、エタノールアミン類としてはトリエタノールアミンなどが挙げられる。添加剤量が下限値未満では十分な付着抑制効果が得られず、上限値を越えてもその効果は変わらずコスト増となる。添加剤量は0.5〜1.5重量%が特に好ましい。消石灰に上記添加剤を所定の割合で添加し、混合攪拌することにより、消石灰表面に付着させることによって、消石灰の流動性や付着性を改善できる。混合攪拌方法としては、縦型或いは横型の羽根付きミキサーや流動層型の気流攪拌ミキサー等が使用できる。なお、上記添加剤を前述した汎用消石灰に添加することで流動性や付着性の改善効果はある程度認められるが、本発明の付着抑制型消石灰に上記添加剤を付着させることにより、改善効果が一層促進される。なお、添加剤の添加方法は、消石灰製造時に使用する消化水に添加混合することによっても同様の効果が得られる。 Moreover, the ratio of 0.1-5 weight% with respect to 100 weight% of slaked lime with 1 type, or 2 or more types of additives chosen from the group which consists of glycols and ethanolamines to the adhesion suppression type | mold slaked lime of this invention May be added. By adding the additive to the slaked lime at a predetermined ratio, the adhesion suppressing effect is further promoted. Examples of glycols include diethylene glycol and ethylene glycol, and examples of ethanolamines include triethanolamine. If the amount of the additive is less than the lower limit, a sufficient adhesion suppressing effect cannot be obtained, and even if the upper limit is exceeded, the effect does not change and the cost increases. The additive amount is particularly preferably 0.5 to 1.5% by weight. The fluidity and adhesion of slaked lime can be improved by adding the additive to the slaked lime at a predetermined ratio and mixing and stirring the slaked lime to adhere to the slaked lime surface. As the mixing and stirring method, a vertical or horizontal bladed mixer, a fluidized bed type airflow stirring mixer, or the like can be used. In addition, although the improvement effect of fluidity | liquidity and adhesiveness is recognized to some extent by adding the said additive to the general purpose slaked lime mentioned above, an improvement effect is further improved by making the said additive adhere to the adhesion suppression type | mold slaked lime of this invention. Promoted. In addition, the same effect is acquired also by the addition method of the additive by adding and mixing to the digestive water used at the time of slaked lime manufacture.
また、本発明の付着抑制型消石灰に、シラスバルーン、バーミキュライト及びパーライトからなる群より選ばれた1種又は2種以上の無機粉体を消石灰100重量%に対して0.5〜5重量%の割合で添加しても良い。消石灰に上記無機粉体を所定の割合で添加することにより、流動性や付着性が更に改善される。シラスバルーンとは、火山灰に含まれるシラスを加熱処理することにより得られる中空球状の微粒子である。バーミキュライトは、SiO2、MgO、Al2O3等を主成分とする薄片状の鉱物であり、原石をある粒度に粉砕、分級し、加熱炉で急速に加熱することにより膨張させたものである。パーライトは、SiO2、Al2O3、K2O等を主成分とする真珠石を粉砕し、高熱処理して原石の約10倍の容積に膨張させたものである。 無機粉体の添加量が下限値未満では十分な付着抑制効果が得られず、上限値を越えてもその効果は変わらず、コスト増となる。添加量は1〜3重量%が特に好ましい。排ガス処理剤などにおいて、これらの無機粉体を消石灰とともに使用する方法は既に公知であるが、本発明にある付着抑制型消石灰にこれらの無機粉体を添加することにより、流動性や付着性を更に改善することができる。 In addition, in the adhesion-suppressing slaked lime of the present invention, 0.5 to 5% by weight of one or more inorganic powders selected from the group consisting of shirasu balloon, vermiculite and pearlite with respect to 100% by weight of slaked lime. You may add in a ratio. By adding the inorganic powder to the slaked lime at a predetermined ratio, fluidity and adhesion are further improved. Shirasu balloons are hollow spherical fine particles obtained by heat-treating shirasu contained in volcanic ash. Vermiculite is a flaky mineral mainly composed of SiO 2 , MgO, Al 2 O 3, etc., which is obtained by pulverizing or classifying a rough ore into a certain particle size and rapidly expanding it by heating in a heating furnace. . Pearlite is obtained by pulverizing pearlite mainly composed of SiO 2 , Al 2 O 3 , K 2 O, etc., and expanding it to a volume approximately 10 times that of the original ore by high heat treatment. If the addition amount of the inorganic powder is less than the lower limit value, a sufficient adhesion suppressing effect cannot be obtained, and even if the upper limit value is exceeded, the effect does not change and the cost increases. The addition amount is particularly preferably 1 to 3% by weight. A method of using these inorganic powders with slaked lime in exhaust gas treatment agents and the like is already known, but by adding these inorganic powders to the adhesion-suppressing slaked lime in the present invention, fluidity and adhesion are improved. Further improvements can be made.
次に本発明の実施例を比較例とともに詳しく説明するが、本発明は以下の例によって限定されるものではない。
<実施例1〜4,比較例1〜3>
先ず、石灰石を電気炉により1100℃、3時間で焼成し、活性度が148mlの生石灰を作製した。次いで、作製した生石灰を10mm以下の粒度にそれぞれ調整し、生石灰100重量部に対し水65重量部を加えて水和、熟成した。次に、得られた消化物を乾燥した後、粒度を150μm以下に調整して所望の消石灰を得た(実施例1)。また、石灰石の焼成条件を次の表1に示す条件にそれぞれ変更させて所望の消石灰を得た(実施例2〜4,比較例1〜3)。
Next, examples of the present invention will be described in detail together with comparative examples, but the present invention is not limited to the following examples.
<Examples 1-4 and Comparative Examples 1-3>
First, limestone was baked in an electric furnace at 1100 ° C. for 3 hours to produce quick lime having an activity of 148 ml. Next, the prepared quicklime was adjusted to a particle size of 10 mm or less, hydrated and aged by adding 65 parts by weight of water to 100 parts by weight of quicklime. Next, after the obtained digest was dried, the particle size was adjusted to 150 μm or less to obtain desired slaked lime (Example 1). Moreover, the calcination conditions of limestone were changed to the conditions shown in the following Table 1 to obtain desired slaked lime (Examples 2 to 4, Comparative Examples 1 to 3).
得られた消石灰を図1及び図2に示される粉体付着力測定装置を用いてその付着力を測定した。図1に示すように、試料容器11は2個の円筒状枠、即ち円筒状の上枠11aと、上枠11aと同形同大の下枠11bとから構成され、上枠11aは下枠11bに重ねて配置されている。下枠11bの下部にはフランジ11cが設けられる。この試料容器11を台座12に載せ、試料容器11内の底部に、枠の内径と同径であって複数の連通孔を有するプラスチック製円盤13aと濾紙14aをこの順に配置した。続いて、得られた消石灰を試料16として上枠11aから溢れるまでまんべんなく入れて軽くすり切り操作をし、その上に枠の内径と同径の濾紙14bと複数の連通孔を有するプラスチック製円盤13bをこの順に配置した。次に、円盤13bの上にピストン17を配置し、プレス機18によりピストン17に対して垂直方向に6kgf/cm2の圧力をかけて試料容器11内部に充填した消石灰試料16を圧縮した。
The adhesion strength of the obtained slaked lime was measured using a powder adhesion force measuring device shown in FIGS. As shown in FIG. 1, the sample container 11 includes two cylindrical frames, that is, a cylindrical
次に、図2に示すように、圧縮した試料16を有する試料容器11を容器固定材22により台座21に固定し、続いて試料容器11の上枠11a上端にワイヤケーブル23の一端を接続した。ワイヤケーブル23は滑車24a,24bにより加重の伝達方向が変換されて、その他端が水容器26の上端に接続される。この水容器26はワイヤケーブル23により台座21から一定の間隔をあけて宙吊り状態で保持されている。続いて、水27を貯留したビュレット28から水容器26に注水し、注水した水容器26の重量によりワイヤケーブル23を介して試料容器11に対して上方向に引張り荷重をかけた。所定の引張り荷重により、試料16が上試料16aと下試料16bとに破断して上枠11aと下枠11bとが分離したとき、水容器26への注水を停止した。水容器26とこの水容器26に注入した水27の重量及び破断した上試料16aと上枠11aの重量をともに秤量し、秤量した各重量から次の式(1)に示す式により付着力を求めた。
Next, as shown in FIG. 2, the sample container 11 having the compressed
また、得られた消石灰をパウダーテスター(ホソカワミクロン社製)により分析を行い、安息角を測定した。その結果を表1に示す。 Moreover, the obtained slaked lime was analyzed with a powder tester (manufactured by Hosokawa Micron Corporation), and the angle of repose was measured. The results are shown in Table 1.
表1に示すように、原料として活性度が比較的高い生石灰を使用した比較例1〜3の消石灰に比べ、活性度が150ml以下の低活性生石灰を使用した実施例1〜4の消石灰では、付着力が低減しており、安息角の結果からも流動性に優れることが判る。 As shown in Table 1, compared with the slaked lime of Comparative Examples 1 to 3 using quick lime having a relatively high activity as a raw material, the slaked lime of Examples 1 to 4 using low activity quick lime having an activity of 150 ml or less, It can be seen that the adhesive force is reduced and the repose angle results in excellent fluidity.
<実施例5〜7、実施例8〜10、比較例4>
実施例3で作製した消石灰を用い、この消石灰に次の表2に示す割合で添加剤を添加して所望の消石灰を得た(実施例5〜7)。また、生石灰の水和時に次の表2に示す割合で添加剤を消化水に添加した以外は実施例3と同様にして消石灰を作製し、この消石灰を乾燥した後、粒度を150μm以下に調整して所望の消石灰を得た(実施例8〜10)。更に、比較例1で作製した消石灰を用い、この消石灰に次の表2に示す割合で添加剤を添加して所望の消石灰を得た(比較例4)。得られた消石灰を用いて実施例1と同様にして付着力測定及び安息角測定を行った。その結果を表2に示す。
<Examples 5-7, Examples 8-10, Comparative Example 4>
Using the slaked lime produced in Example 3, an additive was added to the slaked lime at a ratio shown in Table 2 below to obtain desired slaked lime (Examples 5 to 7). In addition, slaked lime was prepared in the same manner as in Example 3 except that the additive was added to digested water at the ratio shown in Table 2 below when quicklime was hydrated. After drying this slaked lime, the particle size was adjusted to 150 μm or less. Thus, desired slaked lime was obtained (Examples 8 to 10). Furthermore, the desired slaked lime was obtained by using the slaked lime produced in Comparative Example 1 and adding additives to the slaked lime in the proportions shown in Table 2 below (Comparative Example 4). Using the obtained slaked lime, adhesion force measurement and repose angle measurement were performed in the same manner as in Example 1. The results are shown in Table 2.
表2より明らかなように、添加剤を添加した実施例5〜10の消石灰では、前述した表1に示す同じ活性度の生石灰を使用した実施例3の消石灰の結果に比べて付着性及び流動性が改善されていることが判った。また、添加剤を添加した高い活性度の生石灰を用いた比較例4の消石灰と比べても、付着性及び流動性が改善されていた。 As is clear from Table 2, in the slaked lime of Examples 5 to 10 to which the additive was added, adhesion and flow compared to the results of the slaked lime of Example 3 using quick lime having the same activity shown in Table 1 described above. It was found that the sex was improved. Moreover, compared with the slaked lime of the comparative example 4 using the quick lime of high activity which added the additive, adhesiveness and fluidity | liquidity were improved.
<実施例11〜13>
実施例3で作製した消石灰を消石灰A、比較例1で作製した消石灰を消石灰Bとし、これら消石灰A及びBを次の表3に示す割合で混合して所望の消石灰を得た。得られた消石灰を用いて実施例1と同様にして付着力測定及び安息角測定を行った。その結果を表3に示す。
<Examples 11 to 13>
The slaked lime produced in Example 3 was designated as slaked lime A, the slaked lime produced in Comparative Example 1 was designated as slaked lime B, and these slaked lime A and B were mixed at the ratio shown in Table 3 to obtain the desired slaked lime. Using the obtained slaked lime, adhesion force measurement and repose angle measurement were performed in the same manner as in Example 1. The results are shown in Table 3.
表3の結果から、実施例11〜13の消石灰では、付着抑制効果を有する消石灰Aの割合が40重量%以上であれば比較例1の消石灰に比べて半分以下にまで付着力を低減した消石灰を得ることができていた。このことから低活性生石灰を消化して得られた消石灰を前述した汎用消石灰と所定の割合で混合することにより、用途に併せて使い分けできることが確認された。 From the result of Table 3, in the slaked lime of Examples 11-13, if the ratio of the slaked lime A which has an adhesion inhibitory effect is 40 weight% or more, the slaked lime which reduced the adhesive force to half or less compared with the slaked lime of the comparative example 1. Could have obtained. From this, it was confirmed that the slaked lime obtained by digesting the low activity quicklime can be properly used according to the intended use by mixing with the above-mentioned general-purpose slaked lime at a predetermined ratio.
<実施例14〜16>
実施例3で作製した消石灰を用い、この消石灰に次の表4に示す割合で無機粉体を添加して所望の消石灰を得た。なお、無機粉体は開き目150μmの篩通過率が90%以上のものを用いた。得られた消石灰を用いて実施例1と同様にして付着力測定及び安息角測定を行った。その結果を表4に示す。
<Examples 14 to 16>
Using the slaked lime produced in Example 3, an inorganic powder was added to the slaked lime at a ratio shown in Table 4 below to obtain a desired slaked lime. In addition, the inorganic powder having an opening of 150 μm and a sieve passing rate of 90% or more was used. Using the obtained slaked lime, adhesion force measurement and repose angle measurement were performed in the same manner as in Example 1. The results are shown in Table 4.
表4より明らかなように、無機粉体を添加した実施例14〜16の消石灰では、前述した表1に示す同じ活性度の生石灰を使用した実施例3の消石灰の結果に比べて付着性及び流動性が改善されていることが判った。 As is clear from Table 4, in the slaked lime of Examples 14 to 16 to which inorganic powder was added, the adhesion and the slaked lime results of Example 3 using quick lime having the same activity shown in Table 1 described above were compared. It was found that the fluidity was improved.
11 試料容器
16 消石灰試料
11
Claims (4)
4. One or more inorganic powders selected from the group consisting of shirasu balloon, vermiculite and perlite are added at a ratio of 0.5 to 5% by weight with respect to 100% by weight of slaked lime. 2. The adhesion-suppressing slaked lime according to item 1.
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JP2010042970A (en) * | 2008-08-18 | 2010-02-25 | Ube Material Industries Ltd | Slaked lime and method for producing the same |
JP2010202481A (en) * | 2009-03-05 | 2010-09-16 | Yoshizawa Lime Industry | Slaked lime having high reactivity and low adhesiveness, and method for producing the same |
WO2019225202A1 (en) * | 2018-05-19 | 2019-11-28 | 株式会社センテック | Treatment method for reducing carbon dioxide discharge amount of combustion exhaust gas |
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JPH10120448A (en) * | 1996-10-16 | 1998-05-12 | Maruai Sekkai Kogyo Kk | Production of slaked lime |
JP2963626B2 (en) * | 1994-09-06 | 1999-10-18 | 菱光石灰工業株式会社 | Low adhesion slaked lime and method for modifying it |
JP2003252621A (en) * | 2002-03-04 | 2003-09-10 | Okutama Kogyo Co Ltd | Adherability-improved slaked lime |
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JP2963626B2 (en) * | 1994-09-06 | 1999-10-18 | 菱光石灰工業株式会社 | Low adhesion slaked lime and method for modifying it |
JPH10120448A (en) * | 1996-10-16 | 1998-05-12 | Maruai Sekkai Kogyo Kk | Production of slaked lime |
JP2003252621A (en) * | 2002-03-04 | 2003-09-10 | Okutama Kogyo Co Ltd | Adherability-improved slaked lime |
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JP2010042970A (en) * | 2008-08-18 | 2010-02-25 | Ube Material Industries Ltd | Slaked lime and method for producing the same |
JP2010202481A (en) * | 2009-03-05 | 2010-09-16 | Yoshizawa Lime Industry | Slaked lime having high reactivity and low adhesiveness, and method for producing the same |
WO2019225202A1 (en) * | 2018-05-19 | 2019-11-28 | 株式会社センテック | Treatment method for reducing carbon dioxide discharge amount of combustion exhaust gas |
US11414323B2 (en) | 2018-05-19 | 2022-08-16 | Sentec Co. Ltd. | Treatment method for reducing carbon dioxide emission of combustion exhaust gas |
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