JP4172942B2 - Adhesion improved slaked lime - Google Patents
Adhesion improved slaked lime Download PDFInfo
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- JP4172942B2 JP4172942B2 JP2002057319A JP2002057319A JP4172942B2 JP 4172942 B2 JP4172942 B2 JP 4172942B2 JP 2002057319 A JP2002057319 A JP 2002057319A JP 2002057319 A JP2002057319 A JP 2002057319A JP 4172942 B2 JP4172942 B2 JP 4172942B2
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- Prior art keywords
- slaked lime
- adhesion
- pearlite
- improved
- lime
- 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.)
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- 235000011116 calcium hydroxide Nutrition 0.000 title claims description 59
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 title claims description 58
- 239000000920 calcium hydroxide Substances 0.000 title claims description 58
- 229910001861 calcium hydroxide Inorganic materials 0.000 title claims description 58
- 229910001562 pearlite Inorganic materials 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 12
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 240000006909 Tilia x europaea Species 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Description
【０００１】
【発明が属する技術分野】
この発明は、付着性が改善された消石灰に関する。
【０００２】
【従来の技術】
消石灰は、安価な強塩基材料であり、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広く利用されている。これら消石灰は、製造後、貯蔵タンクに貯蔵された後、袋詰めにして出荷されたり、輸送配管等を経由して目的とする工場やプラントに輸送されることが多い。
【０００３】
しかし、一般に消石灰は付着性が強いため、貯蔵中にタンク内に付着したり、輸送配管等で輸送する際に配管内に付着し、閉塞を起こしやすいという問題がある。このため、時々配管を叩いたり、配管内を清掃することによって配管に付着した消石灰を除去しなければならず、維持管理に手間とコストがかかっている。
【０００４】
消石灰の付着性を改善する方法として、消石灰に粉末生石灰及びグリコール等の添加剤を混合する方法が提案されている（特許2963626号、特開平8-73217号など）。さらにこのような添加剤を添加した消石灰を電磁マイクロ波で加熱する方法も提案されている（特開平8-109016号）。
【０００５】
【発明が解決しようとする課題】
しかし、上述したグリコール等のような有機物を添加する方法は、消石灰の用途によっては採用できない場合がある。例えば、消石灰を水処理等に使用する場合、消石灰とともに水中にこれら有機物が溶解し、水中のＢＯＤ、ＣＯＤ、ＴＯＣを上昇させてしまう。また化学工業における反応用アルカリとして用いる場合にも、有機物の存在が化学反応や反応生成物の性質に好ましくない影響を与える可能性がある。添加物添加後の消石灰を電磁マイクロ波で加熱する方法では、そのための装置が必要となり、また大量の消石灰の処理には向かない。
【０００６】
そこで本発明は、消石灰の一般的な用途における消石灰の作用を阻害することなく、簡単に消石灰の付着性を改善し、貯蔵や輸送を円滑に行なうことができる付着性改善消石灰を提供することを目的とする。
【０００７】
【課題を解決するための手段】
上記目的を達成するため、本発明者らは、消石灰に添加しうる種々の無機化合物や鉱物について鋭意研究した結果、比較的少量のパーライトを混合することによって、消石灰の付着性が顕著に改善され、輸送性に優れた消石灰が得られることを見出し、本発明に至ったものである。
【０００８】
即ち、本発明の付着性改善消石灰は、付着性を改善する添加剤としてパーライトを含むものであり、好適には消石灰の1〜5重量％のパーライトを含むものである。さらに好適には、平均粒径が50μｍ以下のパーライトを含むものである。
【０００９】
以下、本発明の付着性改善消石灰について詳細に説明する。
本発明の消石灰は、粉末状のもの、例えば生石灰を消化することによって製造した粉末状消石灰が対象となる。
【００１０】
パーライトは、SiO2、Al2O3、K2Oなどを成分とする真珠岩を細かく粉砕し、高温で加熱処理したものであり、消石灰に混合することにより消石灰の付着性を１／３〜１／６程度まで低下させることができる。パーライト粒子は、消石灰に比べ粒子の硬度が高く、それ自体付着性を持たないものである。このように硬さの差が大きく、付着性を持たないパーライト粒子を消石灰粒子の間に均一に存在させることにより、消石灰の付着力が低下するものと推定される。
【００１１】
パーライトの粒子径は、消石灰の粒子径（通常、約5〜15μｍの範囲）よりも大きすぎると、付着性改善効果が低下するので、平均粒子径で50μｍ以下であることが好ましい。これにより上述したような粒子表面の作用を効果的に生じさせて消石灰の付着性を低下させることができる。また添加量が同一であれば、パーライト粒子が細かいほど粒子数が多くなり付着性改善に寄与しうると考えられる。
【００１２】
パーライトの添加量は、消石灰の1〜5重量％、好ましくは1.5〜3重量％とする。パーライトの添加量を１重量％以上とすることにより、消石灰の付着性を改善することができる。5重量％以上であっても付着性は改善されるが、5重量％以下で顕著に改善され、それ以上配合しても付着性は殆ど変わらずコスト増になる。
【００１３】
消石灰にパーライトを混合する方法は、特に限定されないが、各粉体が均一に混合されればよく、具体的には回転式容器による混合、気流中分散による混合、攪拌機を用いたせん断混合などが挙げられる。
【００１４】
【実施例】
以下、本発明の付着性改善消石灰の実施例を説明する。尚、以下の実施例において特に断らない限り「％」は「重量％」を意味する。
【００１５】
実施例１
生石灰を消化することによって製造した粉末状消石灰に、その2.5％のパーライト（メディアン径30μｍ）を添加、混合したものを貯蔵タンクに貯蔵し、この貯蔵タンクから輸送配管を用いて、消石灰を消費している清掃工場に平均40kg/hで１ヶ月連続して供給した。１ヶ月経過後、配管内に付着した消石灰の層の厚さを測定したところ、1mmであった。
【００１６】
またパーライト添加後の消石灰の付着性を評価するため、最大引張力を測定した。最大引張力の測定は、まず図１に示すような装置（アグロボット：ホソカワミクロン(株)製）を用い、上部セル1１及び下部セル12を接続した後、セル内に粉体20を入れ、上蓋15をして、上部セル11をセル固定リング13で固定する。次いで、圧縮押し込みヘッド14でセルの上蓋15を押し付け、セル内の粉体20を予圧密10kg（2.0kgf/cm2）となるように圧密方向(垂直方向)に圧縮する。その後、図示しない引張ユニットで上部セル11を圧密方向と逆方向に引き上げ、粉体層の破断に要する力（ｇ）を測定した。結果を表１に示す。
【００１７】
比較例１
実施例１と同じ消石灰に、パーライトを添加することなく貯蔵タンクに貯蔵し、実施例１と同じ清掃工場に平均40kg/hで１ヶ月連続して供給した。１ヶ月経過後、配管内に付着した消石灰の層の厚さを測定したところ、12mmであった。またこの消石灰の最大引張力を実施例１と同様に測定した結果を表１に示す。
【００１８】
実施例２、比較例２
実施例１と同じ消石灰に、パーライト(実施例２)及び珪藻土(比較例２)をそれぞれ5.0％添加し、最大引張力を測定した。結果を表１に示す。
【００１９】
実施例３、比較例３
実施例１とは異なるロットから得られた消石灰に、パーライトを5.0％添加し、最大引張力を測定した。パーライトを添加しないもの(比較例３)についても同様に最大引張力を測定した。結果を表１に示す。
【００２０】
【表１】
表に示す最大引張力の結果からも明らかなように、パーライトを添加することによって消石灰の付着性が顕著に改善された。また付着性が改善された消石灰を実際に輸送配管で１ヶ月輸送した場合に、配管内の消石灰の付着が大幅に減少することが確認された。
【００２２】
【発明の効果】
本発明によれば、消石灰にパーライトを添加することによって、消石灰の付着性を大幅に改善することができ、これにより消石灰の貯蔵時の固結や輸送時における配管の閉塞の問題を解消することができ、安定した消石灰の供給を行なうことができる。また貯蔵タンクや輸送配管の清掃作業を軽減し、維持管理を容易にすることができる。
【図面の簡単な説明】
【図１】 本発明の消石灰の付着性を測定するための装置の概要を示す図。
【符号の説明】
11・・・上部セル、12・・・下部セル、14・・・押し込みヘッド、20・・・粉体[0001]
[Technical field to which the invention belongs]
The present invention relates to slaked lime with improved adhesion.
[0002]
[Prior art]
Slaked lime is an inexpensive strong base material, and is widely used as an alkali for reaction in various chemical industries, in addition to being used as a neutralizing agent for acidic substances, an acid removing agent in flue gas and wastewater. These slaked limes are often produced, stored in storage tanks, then packaged and shipped, or transported to a target factory or plant via a transportation pipe or the like.
[0003]
However, since slaked lime is generally highly adherent, there is a problem that the slaked lime adheres to the tank during storage, or adheres to the pipe when transported by a transport pipe or the like, and is liable to be clogged. For this reason, it is necessary to remove slaked lime adhering to the pipes by occasionally hitting the pipes or cleaning the inside of the pipes, which requires labor and cost for maintenance.
[0004]
As a method for improving the adhesion of slaked lime, a method in which additives such as powdered lime and glycol are mixed with slaked lime has been proposed (Japanese Patent No. 2963626, Japanese Patent Laid-Open No. 8-73217, etc.). Furthermore, a method of heating slaked lime to which such an additive has been added with an electromagnetic microwave has also been proposed (Japanese Patent Laid-Open No. Hei 8-09016).
[0005]
[Problems to be solved by the invention]
However, the method of adding an organic substance such as glycol described above may not be employed depending on the use of slaked lime. For example, when slaked lime is used for water treatment or the like, these organic substances are dissolved in water together with slaked lime, and BOD, COD, and TOC in the water are increased. Also, when used as a reaction alkali in the chemical industry, the presence of organic substances may adversely affect the properties of chemical reactions and reaction products. In the method of heating slaked lime after addition of additives with electromagnetic microwaves, an apparatus for that is required, and it is not suitable for processing a large amount of slaked lime.
[0006]
Therefore, the present invention provides an improved adhesion slaked lime that can easily improve the adhesion of slaked lime and can be smoothly stored and transported without impeding the action of the slaked lime in general uses of slaked lime. Objective.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, as a result of intensive studies on various inorganic compounds and minerals that can be added to slaked lime, the inventors have noticeably improved the adhesion of slaked lime by mixing a relatively small amount of pearlite. The present inventors have found that slaked lime excellent in transportability can be obtained, and have reached the present invention.
[0008]
That is, the adhesion improving slaked lime of the present invention contains pearlite as an additive for improving adhesion, and preferably contains 1 to 5% by weight of pearlite of the slaked lime. More preferably, pearlite having an average particle size of 50 μm or less is included.
[0009]
Hereinafter, the adhesion improving slaked lime of the present invention will be described in detail.
The slaked lime of the present invention is a powdery slaked lime produced by digesting quick lime, for example.
[0010]
Pearlite is obtained by finely pulverizing pearlite composed of SiO 2 , Al 2 O 3 , K 2 O, etc., and heat-treating it at a high temperature. It can be reduced to about 1/6. Pearlite particles have a higher particle hardness than slaked lime and do not have adhesiveness per se. Thus, it is presumed that the adhesion force of slaked lime is reduced by making the pearlite particles having a large difference in hardness and having no adhesion evenly between the slaked lime particles.
[0011]
If the particle size of pearlite is too larger than the particle size of slaked lime (usually in the range of about 5 to 15 μm), the effect of improving adhesion decreases, and therefore the average particle size is preferably 50 μm or less. Thereby, the effect | action of the particle | grain surface as mentioned above can be produced effectively, and the adhesiveness of slaked lime can be reduced. Moreover, if the addition amount is the same, the finer the pearlite particles, the larger the number of particles, which may contribute to the improvement of adhesion.
[0012]
The amount of pearlite added is 1 to 5% by weight of slaked lime, preferably 1.5 to 3% by weight. By making the addition amount of pearlite 1% by weight or more, the adhesion of slaked lime can be improved. Adhesion is improved even at 5% by weight or more, but remarkably improved at 5% by weight or less. Adhesion is almost unchanged even when blending more than 5%, resulting in an increase in cost.
[0013]
The method of mixing pearlite with slaked lime is not particularly limited, as long as each powder is uniformly mixed. Specifically, mixing by a rotary container, mixing by dispersion in an air current, shear mixing using a stirrer, etc. Can be mentioned.
[0014]
【Example】
Hereinafter, the Example of the adhesion improvement slaked lime of this invention is described. In the following examples, “%” means “% by weight” unless otherwise specified.
[0015]
Example 1
2.5% pearlite (median diameter 30μm) is added to powdered slaked lime produced by digesting quick lime, the mixture is stored in a storage tank, and slaked lime is consumed from this storage tank using a transportation pipe. Was supplied to an incineration plant at an average of 40 kg / h for one month. After one month, when the thickness of the slaked lime layer adhering to the inside of the pipe was measured, it was 1 mm.
[0016]
Moreover, in order to evaluate the adhesiveness of the slaked lime after pearlite addition, the maximum tensile force was measured. To measure the maximum tensile force, first use an apparatus as shown in Fig. 1 (Ag Robot: manufactured by Hosokawa Micron Corporation). After connecting the
[0017]
Comparative Example 1
The same slaked lime as in Example 1 was stored in a storage tank without adding pearlite, and supplied to the same cleaning plant as in Example 1 at an average of 40 kg / h for one month continuously. After one month, the thickness of the slaked lime layer adhering in the pipe was measured and found to be 12 mm. Table 1 shows the results of measuring the maximum tensile force of this slaked lime in the same manner as in Example 1.
[0018]
Example 2 and Comparative Example 2
To the same slaked lime as in Example 1, 5.0% of pearlite (Example 2) and diatomaceous earth (Comparative Example 2) were added, and the maximum tensile force was measured. The results are shown in Table 1.
[0019]
Example 3 and Comparative Example 3
5.0% of pearlite was added to slaked lime obtained from a lot different from Example 1, and the maximum tensile force was measured. The maximum tensile force was measured in the same manner for the sample to which pearlite was not added (Comparative Example 3). The results are shown in Table 1.
[0020]
[Table 1]
As is apparent from the results of the maximum tensile force shown in the table, the adhesion of slaked lime was significantly improved by adding pearlite. It was also confirmed that when slaked lime with improved adhesion was actually transported for 1 month on a transportation pipe, the adhesion of slaked lime in the pipe was greatly reduced.
[0022]
【The invention's effect】
According to the present invention, by adding pearlite to slaked lime, adhesion of slaked lime can be greatly improved, thereby eliminating the problem of caking during storage and piping blockage during transportation. Therefore, stable slaked lime can be supplied. In addition, the maintenance work can be facilitated by reducing the cleaning work of the storage tank and the transport piping.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of an apparatus for measuring the adhesion of slaked lime according to the present invention.
[Explanation of symbols]
11 ... upper cell, 12 ... lower cell, 14 ... pushing head, 20 ... powder
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002057319A JP4172942B2 (en) | 2002-03-04 | 2002-03-04 | Adhesion improved slaked lime |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002057319A JP4172942B2 (en) | 2002-03-04 | 2002-03-04 | Adhesion improved slaked lime |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003252621A JP2003252621A (en) | 2003-09-10 |
| JP4172942B2 true JP4172942B2 (en) | 2008-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002057319A Expired - Fee Related JP4172942B2 (en) | 2002-03-04 | 2002-03-04 | Adhesion improved slaked lime |
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| JP (1) | JP4172942B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4511398B2 (en) * | 2005-03-28 | 2010-07-28 | 菱光石灰工業株式会社 | Adhesion suppression slaked lime |
| JP5434149B2 (en) * | 2009-03-05 | 2014-03-05 | 吉澤石灰工業株式会社 | Highly reactive and low adhesion slaked lime and method for producing the same |
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| Publication number | Publication date |
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| JP2003252621A (en) | 2003-09-10 |
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