JPH0948646A - Production of powder of quicklime or lightly baked dolomite protected from dispersion - Google Patents
Production of powder of quicklime or lightly baked dolomite protected from dispersionInfo
- Publication number
- JPH0948646A JPH0948646A JP19689595A JP19689595A JPH0948646A JP H0948646 A JPH0948646 A JP H0948646A JP 19689595 A JP19689595 A JP 19689595A JP 19689595 A JP19689595 A JP 19689595A JP H0948646 A JPH0948646 A JP H0948646A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- quicklime
- fluororesin
- dispersion
- dolomite
- 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.)
- Withdrawn
Links
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 239000000843 powder Substances 0.000 title claims abstract description 52
- 239000000292 calcium oxide Substances 0.000 title claims abstract description 46
- 235000012255 calcium oxide Nutrition 0.000 title claims abstract description 46
- 239000006185 dispersion Substances 0.000 title claims abstract description 32
- 239000010459 dolomite Substances 0.000 title claims abstract description 23
- 229910000514 dolomite Inorganic materials 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 238000006703 hydration reaction Methods 0.000 claims abstract description 10
- 238000010008 shearing Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 239000011347 resin Substances 0.000 claims abstract description 7
- 229920005989 resin Polymers 0.000 claims abstract description 7
- 230000036571 hydration Effects 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims abstract description 3
- 235000019738 Limestone Nutrition 0.000 claims description 2
- 239000006028 limestone Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims 1
- 238000010304 firing Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 22
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 abstract description 2
- 239000000347 magnesium hydroxide Substances 0.000 abstract description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 abstract description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 abstract 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract 1
- 235000011941 Tilia x europaea Nutrition 0.000 abstract 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract 1
- 239000004571 lime Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 15
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 5
- 239000000920 calcium hydroxide Substances 0.000 description 5
- 235000011116 calcium hydroxide Nutrition 0.000 description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 5
- 206010061592 cardiac fibrillation Diseases 0.000 description 5
- 230000002600 fibrillogenic effect Effects 0.000 description 5
- 239000007787 solid Substances 0.000 description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229920006361 Polyflon Polymers 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 239000004811 fluoropolymer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/005—Halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/02—Lime
- C04B2/04—Slaking
- C04B2/06—Slaking with addition of substances, e.g. hydrophobic agents ; Slaking in the presence of other compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Fertilizers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は飛散を防止した生石灰ま
たは軽焼ドロマイトの粉末、すなわち取扱いや使用に当
って粉塵の発生が少ない粉末の製造方法に関する。 以
下の記載において、「生石灰」の語をもって、生石灰と
軽焼ドロマイトの両者を代表させる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing powder of quicklime or light-burnt dolomite which is prevented from scattering, that is, powder which produces little dust during handling and use. In the following description, the term "quick lime" is used to represent both quick lime and light burned dolomite.
【０００２】[0002]
【従来の技術】ある種のフッ素樹脂とくにポリテトラフ
ルオロエチレンを、飛散しやすい粉体に対してフィブリ
ル化条件下に混合することにより、粉塵の発生を効果的
に抑制することが提案され（特公昭５２−３２８７７
号）、ポルトランドセメント（特公平５−２４８７２
号）など広い分野でこの方法が利用されつつある。 フ
ィブリル化は圧縮−剪断下に起るが、温度が高いことが
もちろん望ましく、この熱源として生石灰と水との水和
反応を利用し、飛散を防止した消石灰粉末を製造するこ
となどが試みられている（特開平５−２１３６８５
号）。2. Description of the Related Art It has been proposed to effectively suppress the generation of dust by mixing a certain type of fluororesin, especially polytetrafluoroethylene, with a powder that easily scatters under fibrillation conditions. Kosho 52-32877
No.), Portland Cement (Japanese Patent Publication No. 5-24872)
No.) is being used in a wide range of fields. Fibrillation occurs under compression-shearing, but it is of course desirable that the temperature be high, and it has been attempted to produce a slaked lime powder that prevents scattering by utilizing the hydration reaction between quick lime and water as this heat source. (JP-A-5-213685)
issue).
【０００３】フッ素樹脂は高価なものであるし、多量に
配合して粉末の物性を変えることは一般に許されないか
ら、なるべく少量で間に合わせたい。 粉末の用途や所
望する飛散防止効果の程度によっても異なるが、最小
０．００５重量％、最大０．０５重量％使用され、通常
は０．０１〜０．０２重量％程度が適切とされている。Fluorine resins are expensive, and it is generally not allowed to change the physical properties of the powder by blending them in a large amount. Although it depends on the use of the powder and the desired degree of scattering prevention effect, a minimum amount of 0.005% by weight and a maximum amount of 0.05% by weight are used, and usually 0.01 to 0.02% by weight is appropriate. .
【０００４】いうまでもないが、このような低い含有量
でフッ素樹脂を粉末に均一に混合することは、原理的に
きわめて困難である。 そこで、フッ素樹脂を水性ディ
スパージョンの形で混合することが一般に行なわれてい
る。 水性ディスパージョンであれば、許容される限度
の水量に対し、任意の低い濃度の液を用意して使用する
ことにより、上記した低いフッ素樹脂含有量をもつ粉末
を、容易に調製することができる。Needless to say, it is extremely difficult in principle to uniformly mix the fluororesin with the powder at such a low content. Therefore, it is common practice to mix the fluororesin in the form of an aqueous dispersion. If it is an aqueous dispersion, a powder having an above-mentioned low fluororesin content can be easily prepared by preparing and using a liquid having an arbitrarily low concentration with respect to an allowable amount of water. .
【０００５】従来のフッ素樹脂配合による粉末の飛散防
止法は、上記のように稀釈されたフッ素樹脂水性エマル
ジョンを使用するため、粉体にかなりの量の水分を添加
することになるため生石灰に対しては適用できないとし
て、顧みられなかった。 粉末に対して添加する水分の
量は、生石灰の消化による消石灰の製造のような場合を
別にすれば、一般に、ゼロでなければならないか、そう
でないとしてもできるだけ少ない方がよい。 しかし、
ある限度までは許容されることもあり、たとえば生石灰
粉末でも、消石灰の含有をパーセントのレベルで許すグ
レードがある。このことに注目して、発明者らは、稀釈
しない濃厚なフッ素樹脂水性ディスパージョンを使用し
て生石灰の飛散防止を行なうことを着想して実験の結
果、予想外の好成績を得た。The conventional method for preventing powder scattering by blending a fluororesin uses the fluororesin aqueous emulsion diluted as described above, so that a considerable amount of water is added to the powder, so that quicklime is added to quicklime. Was disregarded as not applicable. The amount of water added to the powder should generally be zero or, if not, as low as possible, except in cases such as the production of slaked lime by digestion of quick lime. But,
It may be allowed up to a certain limit, for example even quicklime powders have grades that allow the inclusion of slaked lime at a percentage level. Paying attention to this fact, the inventors obtained an unexpected good result as a result of the experiment, which was conceived to prevent the quick lime from scattering by using a concentrated fluororesin aqueous dispersion which is not diluted.
【０００６】[0006]
【発明が解決しようとする課題】従って本発明の目的
は、微量のフッ素樹脂の配合により飛散を防止した生石
灰粉末を製造する方法であって、水性ディスパージョン
を使用するが粉末に与える水分の量はわずかであり、し
かも配合に過大なエネルギーを必要とすることのない製
造方法を提供することにある。Therefore, an object of the present invention is to provide a method for producing quicklime powder in which scattering is prevented by blending a small amount of fluororesin, wherein an aqueous dispersion is used, but the amount of water given to the powder. Is to provide a manufacturing method that requires a small amount of energy and does not require excessive energy for compounding.
【０００７】[0007]
【課題を解決するための手段】上記の目的を達する本発
明の飛散を防止した生石灰（または軽焼ドロマイト）の
粉末の製造方法は、生石灰（または軽焼ドロマイト）の
粉末にフッ素樹脂の水性ディスパージョンを加え、剪断
力を作用させながら混合し、局部的な水和により生成し
た水酸化物すなわち消石灰（または消石灰および水酸化
マグネシウム）の微粉末に水和反応熱によりフィブリル
化したフッ素樹脂がからんだ状態のものを生石灰（また
は軽焼ドロマイト）の粉末中に分散させることにより、
フッ素樹脂を０．００５〜０．０５重量％含有する粉末
を得ることを特徴とする。Means for Solving the Problems A method for producing powder of quick lime (or light burned dolomite) which prevents scattering according to the present invention which achieves the above-mentioned object is a method of quick lime (or light burned dolomite) powder containing an aqueous dispersion of fluororesin. John is added and mixed under the action of a shearing force to form a hydroxide produced by local hydration, that is, a fine powder of slaked lime (or slaked lime and magnesium hydroxide), and a fluororesin fibrillated by the heat of hydration reaction By dispersing the mixed state in the powder of quick lime (or light burned dolomite),
A powder containing 0.005 to 0.05% by weight of a fluororesin is obtained.
【０００８】フッ素樹脂のディスパージョンは、生石灰
製品中に許容される水分量に応じて、水で稀釈すること
ができる。 たとえば、フッ素樹脂添加に伴う水分量の
増大が１重量％まで許容されるのであれば、固形分濃度
５０％の水性ディスパージョンによりフッ素樹脂０．０
２％を混合しようとする場合、ディスパージョンを最高
２５倍まで稀釈することができる。The fluororesin dispersion can be diluted with water, depending on the amount of water allowed in the quicklime product. For example, if the increase in water content due to the addition of the fluororesin is allowed up to 1% by weight, the fluororesin 0.0% by the aqueous dispersion having a solid content concentration of 50% is used.
When trying to mix 2%, the dispersion can be diluted up to 25 times.
【０００９】一方、生石灰またはドロマイトに与える水
分の量をできるだけ低く抑えたい場合は、水性ディスパ
ージョンを稀釈しないで使用する。 この場合は、フィ
ブリル化に粉末自体がもっている熱を利用することが望
ましい。 粉末自体がもっている熱とは、石灰石または
ドロマイトを焼成して生石灰または軽焼ドロマイトを製
造したとき、冷却途上にあるものが保有している熱であ
る。 この焼成品は粗粒で、通常は粉砕機が耐える温度
まで冷えたところで粉砕して製品としている。その粉砕
中に、または粉砕後にフッ素樹脂の水性ディスパージョ
ンを加えれば、余熱を利用してフィブリル化を行なうこ
とができる。On the other hand, when it is desired to keep the amount of water given to quicklime or dolomite as low as possible, the aqueous dispersion is used without dilution. In this case, it is desirable to utilize the heat of the powder itself for fibrillation. The heat possessed by the powder itself is the heat possessed by what is being cooled when limestone or dolomite is fired to produce quicklime or light-burnt dolomite. This baked product is coarse-grained, and is usually crushed when cooled to a temperature that the crusher can withstand, to obtain a product. If an aqueous dispersion of a fluororesin is added during the pulverization or after the pulverization, fibrillation can be performed by utilizing the residual heat.
【００１０】[0010]
【作用】フッ素樹脂の水性ディスパージョンは、粒径２
０〜４０μｍで固形分濃度６０％程度のものが市販され
ている。 このようなフッ素樹脂ディスパージョンまた
はそれを適量の水で稀釈したものは、生石灰粉末に混合
するとディスパージョン中の水分と生石灰のＣａＯとが
直ちに水和反応してＣａ(ＯＨ)2 が生成する。反応はデ
ィスパージョンに触れたＣａＯ粒子の表面で起り、生成
したＣa(ＯＨ)2は体積膨張により微粉末となってＣａＯ
粒子表面を覆う。 水和に伴い局部的に熱が発生し、デ
ィスパージョン中のフッ素樹脂は水を奪われるとともに
熱を加えられるので、剪断的撹拌によりフィブリル化し
て、上記のＣａ(ＯＨ)2 微粉末にからみ、それらを連結
したような状態になる。[Function] The aqueous dispersion of fluororesin has a particle size of 2
A product having a solid content of about 60% and a size of 0 to 40 μm is commercially available. When such a fluororesin dispersion or a product obtained by diluting it with an appropriate amount of water is mixed with quicklime powder, the water in the dispersion and CaO of quicklime immediately undergo a hydration reaction to produce Ca (OH) 2 . The reaction takes place on the surface of the CaO particles that have come into contact with the dispersion, and the Ca (OH) 2 produced becomes a fine powder due to volume expansion and becomes CaO.
Cover the particle surface. Heat is locally generated due to hydration, and the fluororesin in the dispersion is deprived of water and heated, so that fibrillation is caused by shearing stirring, and the above Ca (OH) 2 fine powder is entangled, It will be like connecting them.
【００１１】ディスパージョンの量は、稀釈した場合で
も生石灰粉末にくらべれば小量であるから、粒子表面が
Ｃａ(ＯＨ)2 微粉末で覆われてそれらにフッ素樹脂フィ
ブリルがからんだ状態は、すべてのＣａＯ粒子において
みられるわけでないが、剪断的な混合により、孤立して
いたＣａＯ粒子に対してもフッ素樹脂のフィブリルがか
らんで行くようになる。 このようにして、Ｃａ(ＯＨ)
2 微粉末をフィブリル化したフッ素樹脂がつないだネッ
トワークの中にＣａＯ粒子がとり込まれた状態が実現
し、飛散防止が実現する。Since the amount of dispersion is smaller than that of quicklime powder even when diluted, the state in which the surface of the particles is covered with Ca (OH) 2 fine powder and the fluororesin fibrils are entangled therein is as follows. Although not found in all CaO particles, shear mixing causes the fibrils of the fluororesin to become entangled with the isolated CaO particles. In this way, Ca (OH)
2 CaO particles are incorporated in the network that is connected to the fluorinated fluoropolymer of fine powder, and scattering is realized.
【００１２】水和反応の熱を利用する上で、水性ディス
パージョン中の水分の形で生石灰に与える水の量は、適
切にえらぶことが望ましい。 そこで、実際に使用する
フッ素樹脂の水性ディスパージョン濃度は、製品生石灰
中のフッ素樹脂濃度と粉末への添加が許容される水分の
量を考え合わせて、決定する。 水性ディスパージョン
に水を加えてうすめることは、とくに問題なく行なえ
る。 一例を挙げれば、固形分濃度６％のフッ素樹脂水
性ディスパージョン（たとえば６０％のものを１０倍に
稀釈して得られる）１ｇを生石灰ＣａＯ２９９ｇに混合
した場合、フッ素樹脂添加量は０．０６ｇ（０．０２
％）となり、このときディスパージョン中の水分が蒸発
などのロスなしにＣａＯと反応したと仮定すると、反応
にかかわるＣａＯは２．９２ｇ（全体の０．９７％)、
生成するＣａ(ＯＨ)2は３．８７ｇ（１．２９％）であ
る。In utilizing the heat of the hydration reaction, it is desirable that the amount of water given to the quick lime in the form of water in the aqueous dispersion is appropriately selected. Therefore, the aqueous dispersion concentration of the fluororesin that is actually used is determined by considering the concentration of the fluororesin in the product quicklime and the amount of water that is allowed to be added to the powder. Adding water to an aqueous dispersion to dilute it can be done without any problems. As an example, when 1 g of an aqueous fluororesin dispersion having a solid concentration of 6% (for example, obtained by diluting 60% with 10 times) is mixed with 299 g of quick lime CaO, the addition amount of the fluororesin is 0.06 g ( 0.02
%), And assuming that the water in the dispersion reacted with CaO without loss such as evaporation, the CaO involved in the reaction was 2.92 g (0.97% of the whole),
The Ca (OH) 2 produced is 3.87 g (1.29%).
【００１３】[0013]
〔実施例１〕下記の粒度分布（累積重量％）をもった生
石灰粉末を用意した：10％粒径 ０．９μｍ，50％粒径
２４．５μｍ，90％粒径 ７３．２μｍ フッ素樹脂の水性ディスパージョンである「ポリフロ
ン」ＴＦＥディスパージョン（ダイキン工業）Ｄ−１
（固形分濃度６０％）を水で１０倍に稀釈したもの１重
量部を、上記の生石灰粉末２９９重量部に加え、ファイ
ンミキサー（ドラム内に低速で逆方向に回転する一対の
撹拌羽根を有する構造）中で、剪断力を加えながら混合
した。 これにより、フィブリル化したフッ素樹脂０．
０２重量％を含有する生石灰粉末を得た。Example 1 Quicklime powder having the following particle size distribution (cumulative weight%) was prepared: 10% particle size 0.9 μm, 50% particle size.
24.5 μm, 90% particle size 73.2 μm “Polyflon” TFE dispersion (Daikin Industries) D-1 which is an aqueous dispersion of fluororesin
1 part by weight of (concentration of solid content 60%) diluted 10 times with water was added to 299 parts by weight of the above quicklime powder, and a fine mixer (having a pair of stirring blades rotating in the opposite direction at low speed in the drum) was added. (Structure) and mixed with applying shearing force. As a result, the fibrillated fluororesin 0.
A quicklime powder containing 02% by weight was obtained.
【００１４】この粉末の飛散性を、つぎのように試験し
た。 すなわち、内寸が３４cm×３４cmの正方形で長さ
が２００cmの風洞を横に置いて、その一端から送風機で
風を送り、他端においてベルトコンベアから落下する粉
末を吹きとばし、落下位置に３４cm×３４cmの受板を置
き、この板の外に飛ばされて落ちた粉末の量を「飛散率
（％）」であらわす。 未処理のものおよびフッ素樹脂
添加による飛散防止処理をしたものの飛散率は、それぞ
れ５６．７％および２．７％であった。The scattering properties of this powder were tested as follows. In other words, a wind tunnel with an inner size of 34 cm x 34 cm and a length of 200 cm is placed sideways, the wind is blown from one end by a blower, and the powder falling from the belt conveyor is blown out at the other end, and the drop position is 34 cm x A 34 cm receiving plate is placed, and the amount of the powder that is thrown out of this plate is represented by "scattering rate (%)". The scatter rates of the untreated product and the product subjected to the shatterproof treatment by adding a fluororesin were 56.7% and 2.7%, respectively.
【００１５】〔実施例２〕軽焼ドロマイトを粉砕して、
下記の粒度分布の粉末を得た：10％粒径 １．３μｍ，5
0％粒径 ２９．０μｍ，90％粒径 ８１．３μｍ 実施例１で用いたものと同じフッ素樹脂の水性ディスパ
ージョンを水で２０倍に稀釈したもの１重量部を、上記
の粉末１９９重量部に対して徐々に加え、化学ミキサー
で剪断力を加えながら混合した。 フッ素樹脂０．０１
５重量％をフィブリル化した状態で含有する軽焼ドロマ
イト粉末が得られた。 前記した方法で測定した飛散率
は、未処理のもの５３．９％、処理したもの３．５％で
あった。Example 2 Light burned dolomite was crushed,
A powder having the following particle size distribution was obtained: 10% particle size 1.3 μm, 5
0% particle size 29.0 μm, 90% particle size 81.3 μm An aqueous dispersion of the same fluororesin used in Example 1 was diluted 20 times with water, 1 part by weight was used, and 199 parts by weight of the above powder was used. Was gradually added and mixed with a chemical mixer while applying a shearing force. Fluorine resin 0.01
A light-burned dolomite powder containing 5% by weight in a fibrillated state was obtained. The scattering rate measured by the method described above was 53.9% for untreated and 3.5% for treated.
【００１６】[0016]
【発明の効果】本発明に従い、生石灰または軽焼ドロマ
イトの粉末にフッ素樹脂の水性ディスパージョンを剪断
力を作用させながら混合することにより、全体として水
分量の添加または増加が僅小で、かつエネルギーの消費
も少ない条件で、飛散防止をした生石灰または軽焼ドロ
マイトの粉末を製造することができる。EFFECTS OF THE INVENTION According to the present invention, by mixing an aqueous dispersion of a fluororesin with a powder of quicklime or light-burnt dolomite while applying a shearing force, the addition or increase of the water content as a whole is small, and the energy consumption is small. It is possible to produce quick-lime or light-burnt dolomite powder that is prevented from scattering under the condition that the consumption of the above is small.
Claims (2)
ッ素樹脂の水性ディスパージョンを加え、剪断力を作用
させながら混合し、局部的な水和により生成した水酸化
物の微粉末に水和反応熱によりフィブリル化したフッ素
樹脂がからんだ状態のものを生石灰または軽焼ドロマイ
トの粉末中に分散させることにより、フッ素樹脂を０.
００５〜０.０５重量％含有する粉末を得ることを特徴
とする、飛散を防止した生石灰または軽焼ドロマイトの
粉末の製造方法。1. A hydration reaction heat is added to a fine powder of hydroxide produced by local hydration by adding an aqueous dispersion of a fluororesin to powder of quicklime or light-burnt dolomite and mixing them while applying a shearing force. By dispersing the entangled fluorinated fluorinated resin by quick lime or light burned dolomite powder,
A method for producing powder of quick-lime or light-burned dolomite which prevents scattering, which comprises obtaining a powder containing 005 to 0.05% by weight.
造された生石灰または軽焼ドロマイトの冷却途上にある
ものを対象に実施し、その粉砕中に、または粉砕後に、
フッ素樹脂の水性ディスパージョンを加える請求項１の
製造方法。2. Carrying out quicklime or light burned dolomite produced by firing limestone or dolomite, which is in the process of cooling, and during or after the crushing.
The method according to claim 1, wherein an aqueous dispersion of a fluororesin is added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19689595A JPH0948646A (en) | 1995-08-01 | 1995-08-01 | Production of powder of quicklime or lightly baked dolomite protected from dispersion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19689595A JPH0948646A (en) | 1995-08-01 | 1995-08-01 | Production of powder of quicklime or lightly baked dolomite protected from dispersion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0948646A true JPH0948646A (en) | 1997-02-18 |
Family
ID=16365442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19689595A Withdrawn JPH0948646A (en) | 1995-08-01 | 1995-08-01 | Production of powder of quicklime or lightly baked dolomite protected from dispersion |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0948646A (en) |
-
1995
- 1995-08-01 JP JP19689595A patent/JPH0948646A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20021001 |