JP4387870B2 - Granular quicklime - Google Patents
Granular quicklime Download PDFInfo
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- JP4387870B2 JP4387870B2 JP2004154994A JP2004154994A JP4387870B2 JP 4387870 B2 JP4387870 B2 JP 4387870B2 JP 2004154994 A JP2004154994 A JP 2004154994A JP 2004154994 A JP2004154994 A JP 2004154994A JP 4387870 B2 JP4387870 B2 JP 4387870B2
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- granular
- slaked lime
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- quicklime
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- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 title claims description 109
- 239000000292 calcium oxide Substances 0.000 title claims description 55
- 235000012255 calcium oxide Nutrition 0.000 title claims description 55
- 239000002245 particle Substances 0.000 claims description 53
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 44
- 239000000920 calcium hydroxide Substances 0.000 claims description 44
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 44
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 44
- 239000000843 powder Substances 0.000 claims description 16
- 239000003230 hygroscopic agent Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000007908 dry granulation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 238000005550 wet granulation Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000004572 hydraulic lime Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- -1 plate Substances 0.000 description 1
- 229920006350 polyacrylonitrile resin Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Drying Of Gases (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Description
本発明は、粒状生石灰及びその製造方法に関するものである。 The present invention relates to granular quicklime and a method for producing the same.
生石灰（酸化カルシウム）は、従来より、吸湿剤、脱水剤、塩基性炉材、セメント材料などに利用されている。特に、最近では、有機ＥＬディスプレイなどの電子機器用の吸湿剤として利用することが検討されている。 Quick lime (calcium oxide) has been conventionally used for hygroscopic agents, dehydrating agents, basic furnace materials, cement materials, and the like. In particular, recently, use as a hygroscopic agent for electronic devices such as organic EL displays has been studied.
非特許文献１には、有機ＥＬディスプレイ用の吸湿剤として、ＰＴＦＥ樹脂と生石灰粉末との混合物をシート状に成形した吸湿性シート（水分ゲッター）が開示されている。この非特許文献では、生石灰粉末の吸湿速度を上げるためには、生石灰の比表面積を大きくすることが有効であると記載されている。 Non-Patent Document 1 discloses a hygroscopic sheet (moisture getter) obtained by molding a mixture of PTFE resin and quicklime powder into a sheet as a hygroscopic agent for an organic EL display. In this non-patent document, it is described that it is effective to increase the specific surface area of quicklime in order to increase the moisture absorption rate of quicklime powder.
比表面積の大きい生石灰粉末を製造する方法としては、消石灰（水酸化カルシウム）を真空下で焼成する方法が知られている。例えば、非特許文献２には、消石灰を真空下にて３００〜３９０℃の温度で焼成して製造した比表面積が１１０〜１３３ｍ2／ｇの生石灰が記載されている。
吸湿剤として用いる生石灰は、比表面積が大きい方が好ましいが、比表面積の大きい生石灰は微粒子であるため、嵩が高くなりがちで、容積当たりの吸湿性が低いという問題がある。また、微粒子の生石灰は、飛散し易くハンドリング性が低いという問題もある。
従って、本発明の目的は、容積当たりの吸湿性が高く、ハンドリング性の高い生石灰を製造する技術を提供することにある。
The quick lime used as the hygroscopic agent preferably has a large specific surface area. However, the quick lime having a large specific surface area is fine, and therefore tends to be bulky and has a problem of low hygroscopicity per volume. In addition, fine quicklime is also likely to be scattered and has low handling properties.
Accordingly, an object of the present invention is to provide a technique for producing quick lime having a high hygroscopicity per volume and a high handling property.
本発明は、ゆるみ見掛けかさ密度が０．５〜１．０ｇ／ｃｍ3の範囲にあり、かつ比表面積が１０ｍ2／ｇ以上の粒状消石灰を、３００Ｐａ以下の圧力下、３２５〜５００℃の温度にて１時間以上焼成する粒状生石灰の製造方法にある。ここで、ゆるみ見掛けかさ密度（ゆるみ見掛け比重ともいう）とは、試料を定量容器に振動（タップ）を加えることなく充填したときの単位体積当たりの質量をいう。 In the present invention, granular slaked lime having a loose apparent bulk density in the range of 0.5 to 1.0 g / cm 3 and a specific surface area of 10 m 2 / g or more is subjected to a temperature of 325 to 500 ° C. under a pressure of 300 Pa or less. It is in the manufacturing method of the granular quicklime baked for 1 hour or more. Here, the loose apparent bulk density (also referred to as loose apparent specific gravity) refers to the mass per unit volume when a sample is filled in a quantitative container without applying vibration (tap).
本発明の粒状生石灰の製造方法の好ましい態様は、次の通りである。
（１）粒状消石灰が、粒子径が０．０７５ｍｍ以上の粒子を５０質量％以上含む。
（２）粒状消石灰が、粒子径が１．０ｍｍ以上の粒子を１０質量％以上含まない。
（３）粒状消石灰が、ゆるみ見掛けかさ密度が０．１〜０．４５ｇ／ｃｍ3の範囲にあり、比表面積が１０ｍ2／ｇ以上の消石灰粉末を乾式造粒して得たものである。
（４）粒状消石灰の比表面積が１５〜６０ｍ2／ｇの範囲にある。
The preferable aspect of the manufacturing method of the granular quicklime of this invention is as follows.
(1) The granular slaked lime contains 50% by mass or more of particles having a particle size of 0.075 mm or more.
(2) The granular slaked lime does not contain 10% by mass or more of particles having a particle size of 1.0 mm or more.
(3) Granular slaked lime is obtained by dry granulating slaked lime powder having a loose apparent bulk density in the range of 0.1 to 0.45 g / cm 3 and a specific surface area of 10 m 2 / g or more.
(4) The specific surface area of the granular slaked lime is in the range of 15 to 60 m 2 / g.
本発明はまた、温度２３℃、相対湿度４５％ＲＨの調整された大気中に１時間静置したときの質量増加量が、１ｃｍ3あたりに換算して０．１５ｇ以上である粒状生石灰にもある。 The present invention also relates to granular quicklime that has a mass increase of 0.15 g or more per 1 cm 3 when left in an adjusted atmosphere at a temperature of 23 ° C. and a relative humidity of 45% RH for 1 hour. is there.
本発明の粒状生石灰の好ましい態様は、次の通りである。
（１）ゆるみ見掛けかさ密度が０．４〜０．８ｇ／ｃｍ3の範囲にある。
（２）粒子径が０．０７５ｍｍ以上の粒子を５０質量％以上含む。
（３）粒子径が１．０ｍｍ以上の粒子を１０質量％以上含まない。
The preferable aspect of the granular quicklime of this invention is as follows.
(1) The loose apparent bulk density is in the range of 0.4 to 0.8 g / cm 3 .
(2) 50 mass% or more of particle | grains whose particle diameter is 0.075 mm or more are included.
(3) Does not contain 10% by mass or more of particles having a particle size of 1.0 mm or more.
本発明はさらに、上記本発明の粒状生石灰からなる吸湿剤にもある。 The present invention is also a hygroscopic agent comprising the granular quicklime of the present invention.
本発明の方法によれば、容積当たりの吸湿性が高く、かつハンドリング性が向上した粒状の生石灰を工業的に効率よく製造することができる。
本発明の粒状生石灰は、容積あたりの吸湿性が高い。従って、本発明の粒状生石灰からなる吸湿剤は、有機ＥＬディスプレイなどの各種電子機器用の吸湿剤として有利に使用することができる。
According to the method of the present invention, granular quicklime having high hygroscopicity per volume and improved handling properties can be industrially efficiently produced.
The granular quicklime of the present invention has a high hygroscopicity per volume. Therefore, the hygroscopic agent comprising the granular quicklime of the present invention can be advantageously used as a hygroscopic agent for various electronic devices such as an organic EL display.
本発明において、粒状生石灰の製造原料として用いる粒状消石灰は、ゆるみ見掛けかさ密度が０．５〜１．０ｇ／ｃｍ3の範囲にあり、かつ比表面積が１０ｍ2／ｇ以上である。
ゆるみ見掛けかさ密度は、０．６〜１．０ｇ／ｃｍ3の範囲にあることが好ましく、０．７〜１．０ｇ／ｃｍ3の範囲にあることがより好ましい。比表面積は、１５〜６０ｍ2／ｇの範囲にあることが好ましく、４０〜６０ｍ2／ｇの範囲にあることがより好ましい。
In the present invention, the granular slaked lime used as a raw material for producing granular quicklime has a loose apparent bulk density in the range of 0.5 to 1.0 g / cm 3 and a specific surface area of 10 m 2 / g or more.
Bulk density loose apparent is preferably in the range of 0.6~1.0g / cm 3, more preferably in the range of 0.7~1.0g / cm 3. The specific surface area is preferably in the range of 15 to 60 2 / g, and more preferably in the range of of 40 to 60 2 / g.
粒状消石灰の純度は、９５質量％以上であることが好ましく、９７質量％以上であることがより好ましい。消石灰は空気中の炭酸ガスと反応して炭酸カルシウムを生成し易いが、炭酸カルシウムは、消石灰と比べて生石灰になりにくいため、その含有量は少ない方が好ましい。炭酸カルシウムの含有量は、５質量％以下であることが好ましく、３質量％以下であることがより好ましく、２質量％以下であることが特に好ましい。 The purity of the granular slaked lime is preferably 95% by mass or more, and more preferably 97% by mass or more. Although slaked lime is likely to react with carbon dioxide gas in the air to produce calcium carbonate, calcium carbonate is less likely to become quick lime compared to slaked lime, so that its content is preferably small. The content of calcium carbonate is preferably 5% by mass or less, more preferably 3% by mass or less, and particularly preferably 2% by mass or less.
粒状消石灰は、粒子径が０．０７５ｍｍ以上の粒子を５０質量％以上、特に６０質量％以上含んでいることが好ましい。また、粒子径が１．０ｍｍ以上の粒子を１０質量％以上、特に５質量％以上含まないことが好ましい。 The granular slaked lime preferably contains 50% by mass or more, particularly 60% by mass or more of particles having a particle size of 0.075 mm or more. Moreover, it is preferable not to contain particles having a particle diameter of 1.0 mm or more in an amount of 10% by mass or more, particularly 5% by mass or more.
一般に市販されている高比表面積の消石灰粉末は、微粒子であるため嵩が高い（ゆるみ見掛けかさ密度が０．１〜０．４５ｇ／ｃｍ3）。本発明では、その嵩高い消石灰粉末を造粒した粒状消石灰を使用することができる。 Generally, slaked lime powder having a high specific surface area that is commercially available is bulky and has a high bulk (a loose apparent bulk density of 0.1 to 0.45 g / cm 3 ). In the present invention, granular slaked lime obtained by granulating the bulky slaked lime powder can be used.
消石灰粉末の造粒方法には、消石灰粉末を乾燥状態のまま造粒する乾式造粒法、あるいは消石灰粉末に水を加えて混練して造粒する湿式造粒法のいずれかの方法を利用することができる。但し、湿式造粒法の場合は水中の炭酸イオンと消石灰とが反応して炭酸カルシウムを生成することがあるため、乾式造粒法を利用する方が好ましい。
乾式造粒法としては、消石灰粉末をロール成形機を用いて加圧して板状に成形し、次いでこの板状消石灰を解砕して、整粒する方法を好ましく用いることができる。
The slaked lime powder is granulated by using either a dry granulation method in which the slaked lime powder is granulated in a dry state or a wet granulation method in which water is added to the slaked lime powder to knead and granulate. be able to. However, in the case of the wet granulation method, since carbonate ions in water and slaked lime may react to generate calcium carbonate, it is preferable to use the dry granulation method.
As the dry granulation method, a method in which slaked lime powder is pressed into a plate shape using a roll molding machine and then crushed and sized is preferably used.
本発明では、上記の粒状消石灰を３００Ｐａ以下、好ましくは１〜２００Ｐａの範囲、より好ましくは１〜１５０Ｐａの範囲の圧力下にて焼成することによって粒状生石灰を製造する。粒状消石灰の焼成温度は３２５〜５００℃の範囲、好ましくは４００〜５００℃の範囲である。粒状消石灰の焼成時間は１時間以上、好ましくは２０時間以下である。 In the present invention, granular quicklime is produced by firing the above-mentioned granular slaked lime under a pressure of 300 Pa or less, preferably in the range of 1 to 200 Pa, more preferably in the range of 1 to 150 Pa. The calcination temperature of granular slaked lime is in the range of 325 to 500 ° C, preferably in the range of 400 to 500 ° C. The calcining time of granular slaked lime is 1 hour or longer, preferably 20 hours or shorter.
上記のようにして得られる生石灰は、生石灰の微粒子が緻密に凝集した粒状物である。この粒状生石灰は、温度２３℃、相対湿度４５％ＲＨの調整された大気中に１時間静置したときの質量増加量が、１ｃｍ3あたりに換算して０．１５ｇ以上（特に０．２０〜０．２５ｇ）であり、容積当たりの吸湿性が極めて高い。 The quicklime obtained as described above is a granular material in which fine particles of quicklime are densely aggregated. This granular quicklime has a mass increase of 0.15 g or more per 1 cm 3 (especially from 0.20 to 0.20) when left in an atmosphere adjusted to a temperature of 23 ° C. and a relative humidity of 45% RH for 1 hour. 0.25 g), and the hygroscopicity per volume is extremely high.
粒状生石灰のゆるみ見掛けかさ密度は、０．４〜０．８ｇ／ｃｍ3の範囲にあることが好ましい。粒子サイズは粒子径が０．０７５ｍｍ以上の粒子を５０質量％以上、特に６０質量％以上含んでいることが好ましい。また、粒子径が１．０ｍｍ以上の粒子を１０質量％以上、特に５質量％以上含まないことが好ましい。 The loose apparent bulk density of granular quicklime is preferably in the range of 0.4 to 0.8 g / cm 3 . The particle size preferably contains 50% by mass or more, particularly 60% by mass or more of particles having a particle size of 0.075 mm or more. Moreover, it is preferable not to contain particles having a particle diameter of 1.0 mm or more in an amount of 10% by mass or more, particularly 5% by mass or more.
本発明の粒状生石灰は、合成樹脂に分散させて、シート状、ペレット状、板状、フィルム状に形成して、吸湿剤として利用することができる。これらの形成物は、有機ＥＬディスプレイなどの電子機器用の乾燥剤として有利に使用することができる。合成樹脂には、ポリオレフィン樹脂、ポリアクリル樹脂、ポリアクリルニトリル樹脂、ポリアミド樹脂、ポリエステル樹脂、エポキシ樹脂、ポリカーボネート樹脂及びフッ素樹脂を用いることができる。 The granular quicklime of the present invention can be dispersed in a synthetic resin and formed into a sheet, pellet, plate, or film, and used as a hygroscopic agent. These formed products can be advantageously used as a desiccant for electronic devices such as organic EL displays. As the synthetic resin, polyolefin resin, polyacrylic resin, polyacrylonitrile resin, polyamide resin, polyester resin, epoxy resin, polycarbonate resin, and fluorine resin can be used.
本発明の粒状生石灰は、また、通常の吸湿剤に用いられている透湿性の袋や容器に収容して使用することもできる。
本発明の粒状生石灰は、単独で使用してもよいし、他の吸湿性材料（例えば、シリカゲル）と併用してもよい。
The granular quicklime of the present invention can also be used by being housed in a moisture-permeable bag or container used for a normal moisture absorbent.
The granular quicklime of this invention may be used independently, and may be used together with another hygroscopic material (for example, silica gel).
本実施例において、ゆるみ見掛けかさ密度（ゆるみ見掛比重）は、ホソカワミクロン（株）製のパウダテスタを用いて測定した。粒度分布は、篩を用いて測定した。
なお、生石灰のゆるみ見掛けかさ密度及び粒度分布の測定は、低湿度環境下（温度：２５℃、湿度：３％ＲＨ以下)で行った。
In this example, the loose apparent bulk density (loose apparent specific gravity) was measured using a powder tester manufactured by Hosokawa Micron Corporation. The particle size distribution was measured using a sieve.
The loose bulk density and particle size distribution of quicklime were measured in a low humidity environment (temperature: 25 ° C., humidity: 3% RH or less).
［実施例１］
比表面積が４９．４ｍ2／ｇの消石灰粉末（純度：９６．７５質量％、炭酸カルシウム含有量：１．６８質量％、ゆるみ見掛けかさ密度：０．３８８ｇ／ｃｍ3、粒子径０．０７５ｍｍ以上の粒子含有量：３３．６質量％、粒子径０．８５ｍｍ以上の粒子含有量：０質量％）を、ロール成形機を用いてロール線圧１０００ｋｇ／ｃｍの条件下で加圧して板状消石灰を得た。次いで、板状消石灰を破砕した後、篩を用いて０．８５ｍｍ以上の粗大粒子を除去した。こうして得られた粒状消石灰のゆるみ見掛けかさ密度は０．７１２ｇ／ｃｍ3、粒子径０．０７５ｍｍ以上の粒子含有量は７９．４質量％であった。
[Example 1]
Slaked lime powder having a specific surface area of 49.4 m 2 / g (purity: 96.75% by mass, calcium carbonate content: 1.68% by mass, loose apparent bulk density: 0.388 g / cm 3 , particle size of 0.075 mm or more The plate content of 33.6% by mass and the content of particles having a particle diameter of 0.85 mm or more: 0% by mass) under a roll linear pressure of 1000 kg / cm using a roll molding machine. Got. Next, after crushing the plate-like slaked lime, coarse particles of 0.85 mm or more were removed using a sieve. The loose apparent bulk density of the granular slaked lime thus obtained was 0.712 g / cm 3 , and the content of particles having a particle diameter of 0.075 mm or more was 79.4% by mass.
上記粒状消石灰を管状炉に入れ、真空ポンプを用いて管状炉内の圧力を１×１０2Ｐａとした後、４２５℃の温度にて６時間焼成して、粒状生石灰を製造した。得られた粒状生石灰のゆるみ見掛けかさ密度は、０．５４０ｇ／ｃｍ3であった。また、粒度分布は、粒子径０．０７５ｍｍ以上の粒子含有量が７７．０質量％、粒子径０．８５ｍｍ以上の粒子含有量が０質量％であった。 The granular slaked lime was put into a tubular furnace, and the pressure in the tubular furnace was set to 1 × 10 2 Pa using a vacuum pump, followed by firing at a temperature of 425 ° C. for 6 hours to produce granular quicklime. The loose apparent bulk density of the obtained granular quicklime was 0.540 g / cm 3 . In addition, the particle size distribution was 77.0% by mass for particles having a particle diameter of 0.075 mm or more, and 0% by mass for particles having a particle diameter of 0.85 mm or more.
［実施例２］
消石灰粉末の加圧処理をロール線圧１５００ｋｇ／ｃｍの条件で行う以外は実施例１と同様にして粒状消石灰を得た。得られた粒状消石灰のゆるみ見掛けかさ密度は、０．７４９ｇ／ｃｍ3で、粒子径０．０７５ｍｍ以上の粒子含有量は、８０．０質量％であった。
この粒状消石灰を管状炉に入れ、実施例１と同じ条件で焼成して、粒状生石灰を製造した。得られた粒状生石灰のゆるみ見掛けかさ密度は０．５７０ｇ／ｃｍ3、粒子径０．０７５ｍｍ以上の粒子含有量は７８．２質量％であった。
[Example 2]
Granular slaked lime was obtained in the same manner as in Example 1 except that the slaked lime powder was pressed under a roll linear pressure of 1500 kg / cm. The loose apparent bulk density of the obtained granular slaked lime was 0.749 g / cm 3 , and the content of particles having a particle diameter of 0.075 mm or more was 80.0% by mass.
This granular slaked lime was put in a tubular furnace and fired under the same conditions as in Example 1 to produce granular quicklime. The loose quick bulk density of the obtained granular quicklime was 0.570 g / cm 3 , and the content of particles having a particle diameter of 0.075 mm or more was 78.2% by mass.
［実施例３］
消石灰粉末の加圧処理をロール線圧２０００ｋｇ／ｃｍの条件で行う以外は実施例１と同様にして粒状消石灰を得た。得られた粒状消石灰のゆるみ見掛けかさ密度は、０．７６７ｇ／ｃｍ3で、粒子径０．０７５ｍｍ以上の粒子含有量は、８１．１質量％であった。
この粒状消石灰を管状炉に入れ、実施例１と同じ条件で焼成して、粒状生石灰を製造した。得られた粒状生石灰のゆるみ見掛けかさ密度は、０．５８５ｇ／ｃｍ3であった。また、粒度分布は、粒子径０．０７５ｍｍ以上の粒子含有量は７９．０質量％であり、粒子径０．８５ｍｍ以上の粒子含有量は０質量％であった。
[Example 3]
Granular slaked lime was obtained in the same manner as in Example 1 except that the slaked lime powder was pressed under the condition of a roll linear pressure of 2000 kg / cm. The loose apparent bulk density of the obtained granular slaked lime was 0.767 g / cm 3 , and the content of particles having a particle diameter of 0.075 mm or more was 81.1% by mass.
This granular slaked lime was put in a tubular furnace and fired under the same conditions as in Example 1 to produce granular quicklime. The loose apparent bulk density of the obtained granular quicklime was 0.585 g / cm 3 . As for the particle size distribution, the content of particles having a particle diameter of 0.075 mm or more was 79.0% by mass, and the content of particles having a particle diameter of 0.85 mm or more was 0% by mass.
［比較例１］
消石灰粉末を、加圧処理を行わずに管状炉に入れ、実施例１と同じ条件で焼成した。得られた生石灰は粉末状であり、そのゆるみ見掛けかさ密度は、０．２９０ｇ／ｃｍ3であった。また、粒度分布は、粒子径０．０７５ｍｍ以上の粒子含有量は３３．６質量％で、粒子径０．８５ｍｍ以上の粒子含有量は０質量％であった。
[Comparative Example 1]
The slaked lime powder was put into a tubular furnace without performing pressure treatment and fired under the same conditions as in Example 1. The obtained quicklime was powdery, and its loose apparent bulk density was 0.290 g / cm 3 . As for the particle size distribution, the content of particles having a particle diameter of 0.075 mm or more was 33.6% by mass, and the content of particles having a particle diameter of 0.85 mm or more was 0% by mass.
［吸湿性の評価］
実施例１〜３及び比較例１にて製造した生石灰の吸湿性を次のようにして評価した。
試料の粒状生石灰０．１ｇを正確に量り取り、これを温度２３℃、湿度４５％ＲＨに調整したグローブボックスに入れ、１時間静置した。静置後の生石灰の質量を測定して、０．１ｇあたりの重量増加量（ｇ）を算出し、下記の式により１ｃｍ3あたりの重量増加量（ｇ／ｃｍ3）に換算した。その結果を表１に示す。
１ｃｍ3あたりの重量増加量（ｇ／ｃｍ3）＝０．１ｇあたりの重量増加量（ｇ）／０．１ｇ×生石灰のゆるみ見掛けかさ密度（ｇ／ｃｍ3）
[Evaluation of hygroscopicity]
The hygroscopicity of quicklime produced in Examples 1 to 3 and Comparative Example 1 was evaluated as follows.
A sample of 0.1 g of granular quicklime was accurately weighed and placed in a glove box adjusted to a temperature of 23 ° C. and a humidity of 45% RH, and allowed to stand for 1 hour. The mass of quicklime after standing was measured, the weight increase (g) per 0.1 g was calculated, and converted to the weight increase per 1 cm 3 (g / cm 3 ) by the following formula. The results are shown in Table 1.
Weight increase per 1 cm 3 (g / cm 3 ) = Weight increase per 0.1 g (g) /0.1 g × Lack apparent bulk density of quick lime (g / cm 3 )
表１
────────────────────────────────────────
ゆるみ見掛けかさ密度 ０．１ｇあたりの重量 １ｃｍ3あたりの重量
（ｇ／ｃｍ3） 増加量（ｇ） 増加量（ｇ／ｃｍ3）
────────────────────────────────────────
実施例１ ０．５４０ ０．０３６９ ０．２０
実施例２ ０．５７０ ０．０３６４ ０．２１
実施例３ ０．５８５ ０．０３５４ ０．２１
────────────────────────────────────────
比較例１ ０．２９０ ０．０３６８ ０．１１
────────────────────────────────────────
Table 1
────────────────────────────────────────
Loose apparent bulk density Weight per 0.1 g Weight per cm 3
(G / cm 3 ) Increase (g) Increase (g / cm 3 )
────────────────────────────────────────
Example 1 0.540 0.0369 0.20
Example 2 0.570 0.0364 0.21
Example 3 0.585 0.0354 0.21
────────────────────────────────────────
Comparative Example 1 0.290 0.0368 0.11
────────────────────────────────────────
表１の結果から、実施例１〜３にて製造した粒状生石灰は、比較例１にて製造した粉末状生石灰と比べて、０．１ｇあたりの重量増加量は同等であるが、１ｃｍ3あたりの重量増加量が顕著に高いことが分かる。 From the results in Table 1, the granular quicklime produced in Examples 1 to 3 has the same weight increase per 0.1 g as that of the powdered quicklime produced in Comparative Example 1, but per cm 3 It can be seen that the amount of weight increase is significantly high.
Claims (10)
A hygroscopic agent comprising the granular quicklime according to any one of claims 6 to 9.
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| US9115033B2 (en) | 2011-07-14 | 2015-08-25 | Ube Material Industries, Ltd. | Moisture absorbent for organic electroluminescence element and production method for same |
| KR20150106909A (en) | 2013-01-10 | 2015-09-22 | 우베 마테리알즈 가부시키가이샤 | Water absorbent and method for producing same |
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| JP2006021945A (en) * | 2004-07-07 | 2006-01-26 | Yoshizawa Lime Industry | Highly reactive quick lime and its manufacturing method |
| JP2006169062A (en) * | 2004-12-17 | 2006-06-29 | Ube Material Industries Ltd | Porous particulate containing calcium oxide |
| JP5165213B2 (en) * | 2006-06-20 | 2013-03-21 | 宇部マテリアルズ株式会社 | Calcium oxide powder and method for producing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9115033B2 (en) | 2011-07-14 | 2015-08-25 | Ube Material Industries, Ltd. | Moisture absorbent for organic electroluminescence element and production method for same |
| KR20150106909A (en) | 2013-01-10 | 2015-09-22 | 우베 마테리알즈 가부시키가이샤 | Water absorbent and method for producing same |
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