JPH0234514A - Preparation of fibrous calium carbonate - Google Patents
Preparation of fibrous calium carbonateInfo
- Publication number
- JPH0234514A JPH0234514A JP18236588A JP18236588A JPH0234514A JP H0234514 A JPH0234514 A JP H0234514A JP 18236588 A JP18236588 A JP 18236588A JP 18236588 A JP18236588 A JP 18236588A JP H0234514 A JPH0234514 A JP H0234514A
- Authority
- JP
- Japan
- Prior art keywords
- reaction
- fibrous
- reaction tank
- suspension
- calcium carbonate
- 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.)
- Granted
Links
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 69
- 238000006243 chemical reaction Methods 0.000 claims abstract description 41
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 32
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 23
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 23
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 8
- 239000000725 suspension Substances 0.000 claims abstract description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 30
- 239000001569 carbon dioxide Substances 0.000 claims description 15
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 15
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 10
- 229910001424 calcium ion Inorganic materials 0.000 claims description 10
- 239000007900 aqueous suspension Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 235000010216 calcium carbonate Nutrition 0.000 abstract description 32
- 239000000835 fiber Substances 0.000 abstract description 14
- 239000000919 ceramic Substances 0.000 abstract description 10
- 238000005452 bending Methods 0.000 abstract description 3
- 239000011575 calcium Substances 0.000 abstract description 3
- 238000007664 blowing Methods 0.000 abstract description 2
- 235000011116 calcium hydroxide Nutrition 0.000 abstract 4
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- -1 etc. Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- HFNQLYDPNAZRCH-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O.OC(O)=O HFNQLYDPNAZRCH-UHFFFAOYSA-N 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000000635 electron micrograph Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、長径１０−１００μ寓、かつ短径０．１〜３
．０μ肩である繊維状炭酸カルシウムの製造方法に関す
る。さらに詳しくは、本発明は、曲げ強度などの強度や
靭性、耐熱性、吸油能に優れ、しかもセラミック繊維系
複合材料などに用いられるセラミック繊維等の代替物な
どとして有用である、安価な繊維状炭酸カルシウムを簡
単に、かつ効率良く製造しうる工業的製法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention has a major axis of 10-100μ and a minor axis of 0.1-3.
．． The present invention relates to a method for producing fibrous calcium carbonate having a 0μ shoulder. More specifically, the present invention provides an inexpensive fibrous material that has excellent bending strength and other strength, toughness, heat resistance, and oil absorption ability, and is useful as a substitute for ceramic fibers used in ceramic fiber-based composite materials. This invention relates to an industrial method for easily and efficiently producing calcium carbonate.
従゛来の技術
水酸化カルシウムと二酸化炭素又は二酸化炭素含有ガス
との反応によって紡錘状、立方体状、柱状、球状等の種
々の形状の炭酸カルシウムが生成することはよく知られ
ている（特開昭５９−２６９２７号公報、特公昭５９−
１２６０７号公報、特公昭５５−５１８５２号公報）。Conventional technology It is well known that calcium carbonate in various shapes such as spindle, cubic, columnar, and spherical shapes are produced by the reaction of calcium hydroxide with carbon dioxide or carbon dioxide-containing gas (Japanese Patent Application Laid-Open No. Publication No. 59-26927, Special Publication No. 59-
12607, Japanese Patent Publication No. 55-51852).
これら炭酸カルシウムは、紙、ゴム、プラスチックなど
の白色光てん剤、紙塗工顔料、医薬や化粧品等の添加剤
として広く使用されている。These calcium carbonates are widely used as white brightening agents for paper, rubber, plastics, etc., paper coating pigments, and additives for medicines, cosmetics, etc.
しかしながら、これらの炭酸カルシウムは、例えばプラ
スチック等に充てんした場合、補強効果はなく、増量剤
として用いる場合がほとんどであった。However, when these calcium carbonates are filled into plastics, for example, they have no reinforcing effect and are mostly used as fillers.
最近、針状の炭酸カルシウムの製造法として、長径５〜
ｌＯＯμｍで短径０．２〜５μｍの針状粒子炭酸カルシ
ウムを水酸化カルシウムの飽和溶液に二酸化炭素含有ガ
スを吹き込むことにより生成させる方法が提案されてい
るが（特開昭６２−２７８１２３号公報）、このものは
炭酸カルシウムの生成量が水酸化カルシウムの溶解度に
支配されるため、生産性が低下するのを免れない。Recently, as a method for producing acicular calcium carbonate, major axis 5~
A method has been proposed in which acicular calcium carbonate particles with a width of 100 μm and a minor axis of 0.2 to 5 μm are produced by blowing carbon dioxide-containing gas into a saturated solution of calcium hydroxide (Japanese Patent Laid-Open No. 62-278123). However, since the amount of calcium carbonate produced is controlled by the solubility of calcium hydroxide, productivity inevitably decreases.
また、本発明者らは、先に長径１５〜５０μｍで短径０
．５〜２μｍである繊維状炭酸カルシウムから成るプラ
スチック月光てん剤を提案したが（特願昭６３−５８９
４３号）、この繊維状炭酸カルシウムでは粒子径範囲が
狭く、セラミック繊維の代替物として用いることは難し
いという問題がある。In addition, the present inventors previously found that the major axis was 15 to 50 μm and the minor axis was 0.
．． A plastic moonlight agent made of fibrous calcium carbonate with a diameter of 5 to 2 μm was proposed (Japanese Patent Application No. 63-589).
No. 43), this fibrous calcium carbonate has a problem that the particle size range is narrow and it is difficult to use it as a substitute for ceramic fibers.
他方、セラミック繊維としては、カーボン、炭化ケイ素
、アルミナ、チタン酸カリウムなどの繊維があるものの
、非常に高価であるため、安価なセラミック繊維の代替
物の開発が要望されていた。On the other hand, although there are ceramic fibers made of carbon, silicon carbide, alumina, potassium titanate, etc., they are very expensive, so there has been a demand for the development of an inexpensive substitute for ceramic fibers.
発明が解決しようとする課題
本発明は、このような従来の欠点を克服し、セラミック
繊維の代替物として有用な繊維状炭酸カルシウムを簡単
かつ効率的で、しかも安価に製造しうる工業的方法を提
供することを目的としてなされたものである。Problems to be Solved by the Invention The present invention overcomes these conventional drawbacks and provides an industrial method for easily, efficiently, and inexpensively producing fibrous calcium carbonate useful as a substitute for ceramic fibers. It was made for the purpose of providing.
課題を解決するための手段
本発明者らは、セラミック繊維の代替物として有用な繊
維状炭酸カルシウムの工業的製法を開発するために種々
研究を重ねた結果、まず二酸化炭素を反応槽中に吹き込
み、次いで水酸化カルシウム水性懸濁液を導入するとと
もに、これら反応成分の供給量をカルシウムイオン濃度
が所定範囲になるように調整し、かつ反応槽内温度を所
定範囲内に維持しながら反応させることにより、その目
的を達成しうろことを見出し、この知見に基づいて本発
明を完成するに至った。Means for Solving the Problems The present inventors have conducted various studies to develop an industrial method for producing fibrous calcium carbonate useful as a substitute for ceramic fibers. Then, an aqueous suspension of calcium hydroxide is introduced, and the supply amount of these reaction components is adjusted so that the calcium ion concentration is within a predetermined range, and the reaction is carried out while maintaining the temperature inside the reaction tank within a predetermined range. As a result, the inventors discovered that the object could be achieved, and based on this knowledge, they completed the present invention.
すなわち、本発明は、水酸化カルシウムと二酸化炭素を
反応させて炭酸カルシウムを製造するに当り、反応槽中
に二酸化炭素を吹き込み、水酸化カルシウム水性懸濁液
を連続的に導入するとともに、反応槽中のカルシウムイ
オン濃度が帆００１〜０．００５ｍｏＱ／ Ｑの範囲に
なるように二酸化炭素及び水酸化カルシウム水性懸濁液
の供給量を調整し、かつ反応槽内の温度を５０〜１００
℃に保ちながら、反応を行うことを特徴とする、平均粒
子径が長径ｌＯ〜１００μｍ１かつ短径０．１〜３．０
μｍである繊維状炭酸カルシウムの製造方法を提供する
ものである。That is, in the present invention, when calcium hydroxide and carbon dioxide are reacted to produce calcium carbonate, carbon dioxide is blown into the reaction tank, an aqueous calcium hydroxide suspension is continuously introduced, and the reaction tank is The supply amount of carbon dioxide and calcium hydroxide aqueous suspension was adjusted so that the calcium ion concentration in the reactor was in the range of 0.001 to 0.005 moQ/Q, and the temperature in the reaction tank was adjusted to 50 to 100%.
The reaction is carried out while maintaining the temperature at °C, and the average particle diameter is 10 to 100 μm in major axis and 0.1 to 3.0 in minor axis.
The present invention provides a method for producing fibrous calcium carbonate having a diameter of .mu.m.
本発明方法に用いる反応槽は、プロペラ又はタービン型
かくはん翼を備えた円筒型のものが好ましい。また、連
続反応であるため、オーバーフローｆｆｉの反応槽が好
ましい。The reaction vessel used in the method of the present invention is preferably a cylindrical type equipped with a propeller or turbine type stirring blade. Moreover, since the reaction is continuous, a reaction tank with overflow ffi is preferable.
本発明方法においては、まず反応槽中に二酸化炭素を吹
き込むことが重要である。二酸化炭素は純粋なものを用
いる必要はなく、通常窒素等で希釈した二酸化炭素含有
ガスが用いられる。次いで、水酸化カルシウム水性懸濁
液が連続的に導入される。反応は、反応槽中のカルシウ
ムイオン濃度が０．００１〜０．００５ｍｏ（２／１２
、好ましくは０．００２−０．００４ｒａｏ１２／Ｑの
範囲になるように二酸化炭素及び水酸化カルシウム水性
懸濁液の供給量を調整しながら行う必要がある。カルシ
ウムイオン濃度がこの範囲を逸脱すると、３〜５μ讃の
角状炭酸カルシウムが生成するのを免れない。また、反
応槽内の温度は５０〜１００℃、好ましくは６０〜９０
°Ｃに保つことが必要である。この温度が５０’Ｏ未満
では３〜５μｍの角状炭酸カルシウム、又は３〜５μｍ
の角状炭酸カルシウムと、長径３〜６μｍ１短径０．５
〜ｌｐｍの柱状炭酸カルシウムとの混合物が生成する。In the method of the present invention, it is important to first blow carbon dioxide into the reaction tank. It is not necessary to use pure carbon dioxide, and a carbon dioxide-containing gas diluted with nitrogen or the like is usually used. An aqueous calcium hydroxide suspension is then introduced continuously. The reaction was carried out when the calcium ion concentration in the reaction tank was 0.001 to 0.005 mo (2/12
It is necessary to adjust the supply amount of carbon dioxide and calcium hydroxide aqueous suspension so that the amount is preferably in the range of 0.002-0.004 rao12/Q. If the calcium ion concentration deviates from this range, 3 to 5 μm of calcium carbonate crystals are inevitably produced. In addition, the temperature inside the reaction tank is 50 to 100°C, preferably 60 to 90°C.
It is necessary to keep it at °C. If this temperature is less than 50'O, 3-5 μm of calcium carbonate, or 3-5 μm
of angular calcium carbonate with a major axis of 3 to 6 μm and a minor axis of 0.5
A mixture with ~lpm of columnar calcium carbonate is formed.
また、供給される水酸化カルシウム水性懸濁液濃度は５
〜１００ｇ／１２であることが好ましい。この濃度がこ
れよりも低すぎると生産性が低下するし、またこれを越
えると生成する炭酸カルシウムが繊維状であるため粘度
が高くなりすぎてかくはんやポンプ輸送等が困難になる
。In addition, the concentration of the supplied calcium hydroxide aqueous suspension is 5
It is preferable that it is -100g/12. If this concentration is too low, productivity will decrease, and if it exceeds this concentration, the calcium carbonate produced will be fibrous and have too high a viscosity, making stirring, pumping, etc. difficult.
また、反応槽中のカルシウムイオン濃度を上記所定範囲
に保つために、供給される水酸化カルシウム水性懸濁液
中にＭｇやＳｒ等の塩、例えば炭酸塩などのようなカル
シウムイオンの溶出を抑制しうる添加物を加えてもよい
。この際、この添加物は水酸化カルシウムに対し、通常
帆ｌ〜５重量％用いられる。In addition, in order to maintain the calcium ion concentration in the reaction tank within the above-mentioned predetermined range, elution of calcium ions such as salts such as Mg and Sr, such as carbonates, into the supplied calcium hydroxide aqueous suspension is suppressed. Additional additives may be added. At this time, this additive is usually used in an amount of 1 to 5% by weight based on calcium hydroxide.
さらに、繊維状炭酸カルシウムを安定に生成させるため
、特開昭５４−５０４９９号公報に記載の製造方法で製
造された、長径１〜２μｍ１短径０．１〜０．２μｍの
アラゴナイト系柱状炭酸カルシウムを水酸化カルシウム
水懸濁液中に水酸化カルシウムに対し、 ０．１−１０
重量％添加してもよい。Furthermore, in order to stably produce fibrous calcium carbonate, aragonite-based columnar calcium carbonate having a major axis of 1 to 2 μm and a minor axis of 0.1 to 0.2 μm was manufactured using the manufacturing method described in JP-A No. 54-50499. for calcium hydroxide in aqueous suspension of calcium hydroxide, 0.1-10
It may be added in weight percent.
本発明方法によって得られる繊維状炭酸カルシウムは、
平均粒子径が長径１０〜１００２票、短径０．１〜３．
０μ肩であり、０．２〜０．０３ｇ／ｃｃの嵩比重及び
１００〜２５０ＣＣ／ １００ｇの吸油能を示す。The fibrous calcium carbonate obtained by the method of the present invention is
The average particle diameter is a major axis of 10 to 1002, and a minor axis of 0.1 to 3.
It has a 0μ shoulder, a bulk specific gravity of 0.2 to 0.03 g/cc, and an oil absorption capacity of 100 to 250 CC/100 g.
反応槽中のカルシウムイオン濃度は、イオン濃度計等を
用いて測定される。この測定は連続的に行うのが望まし
い。The calcium ion concentration in the reaction tank is measured using an ion concentration meter or the like. It is desirable to perform this measurement continuously.
発明の効果
本発明方法によれば、高品質の繊維状炭酸カルシウムを
簡単かつ効率的で、しかも安価に製造することができ、
工業的に有利である。Effects of the Invention According to the method of the present invention, high-quality fibrous calcium carbonate can be produced easily, efficiently, and inexpensively.
Industrially advantageous.
本発明方法により得られる繊維状炭酸カルシウムは、安
価であり、かつ曲げ強度などの強度や靭性、耐熱性、吸
油性に優れ、セラミック繊維系複合材料などに用いられ
るセラミック繊維等の代替物などとして好適に利用しう
る。The fibrous calcium carbonate obtained by the method of the present invention is inexpensive and has excellent strength such as bending strength, toughness, heat resistance, and oil absorption, and can be used as a substitute for ceramic fibers used in ceramic fiber composite materials. It can be suitably used.
実施例 次に実施例によって本発明をさらに詳細に説明する。Example Next, the present invention will be explained in more detail with reference to Examples.
実施例１
プロペラ型かくはん機を備えた容量３０ｆｆの円筒状オ
ーバーフロー型連続反応槽に、二酸化炭素濃度３０容量
％の二酸化炭素含有ガスを０．７Ｎｍ’／ｈｒ吹き込み
、反応槽内温度を７５℃に保ちながら、３０ｇ／１２の
濃度の水酸化カルシウム水性懸濁液を、反応槽内のカル
シウムイオン濃度が０．００３ｍｏ（Ｌ／ Ｑになるよ
うに供給し、６時間連続反応を行った。Example 1 A carbon dioxide-containing gas with a carbon dioxide concentration of 30% by volume was blown at 0.7 Nm'/hr into a 30 ff capacity cylindrical overflow continuous reaction tank equipped with a propeller type stirrer, and the temperature inside the reaction tank was brought to 75°C. While maintaining the temperature, an aqueous calcium hydroxide suspension having a concentration of 30 g/12 was supplied so that the calcium ion concentration in the reaction tank was 0.003 mo (L/Q), and a continuous reaction was performed for 6 hours.
反応槽よりオーバーフローする炭酸カルシウムの量は１
０１２／ｈｒであった。The amount of calcium carbonate overflowing from the reaction tank is 1
It was 012/hr.
このようにして平均粒子径が長径３５μｍ１短径０．８
ｐｒａであり、０．０５ｇ／ＣＣの嵩比重及び１９８ｃ
ｃ／１０ｈの吸油能を有する繊維状炭酸カルシウムを得
た。このものの繊維形状を示す走査型電子顕微鏡写真を
第１図に示す。In this way, the average particle diameter is 35 μm in major axis and 0.8 in short axis.
pra, bulk specific gravity of 0.05g/CC and 198c
Fibrous calcium carbonate having an oil absorption capacity of c/10h was obtained. A scanning electron micrograph showing the fiber shape of this material is shown in FIG.
実施例２〜６
容量３０Ｑ又は５００１２の反応槽を用い、次表に示し
た反応条件−下で実施例１と同様に反応を行った。Examples 2 to 6 Using a reaction tank with a capacity of 30Q or 50012, reactions were carried out in the same manner as in Example 1 under the reaction conditions shown in the following table.
得られた繊維状炭酸カルシウムの物性を次表に示す。The physical properties of the obtained fibrous calcium carbonate are shown in the table below.
比較例１
反応槽内のカルシウムイオン濃度が０．０００８ｍｏＱ
／Ｑになるように水酸化カルシウム水性懸濁液を供給す
る以外は実施例１と同様に反応を行った。Comparative Example 1 Calcium ion concentration in the reaction tank is 0.0008moQ
The reaction was carried out in the same manner as in Example 1, except that the calcium hydroxide aqueous suspension was supplied so that the amount of
反応槽よりオーバーフローする炭酸カルシウムの量はＩ
ＩＱ／ｈｒであった。The amount of calcium carbonate overflowing from the reaction tank is I
IQ/hr.
このようにして平均粒子径３．５μ肩の角状炭酸カルシ
ウムを得た。このものの繊維形状を示す走査を電子顕微
鏡写真を第２図に示す。In this way, angular calcium carbonate having an average particle diameter of 3.5 μm was obtained. A scanned electron micrograph showing the fiber shape of this material is shown in FIG.
比較例２．３
容量３０ｍ又は５００ａの反応槽を用い、次表に示した
反応条件下で比較例１と同様に反応を行った。Comparative Example 2.3 Using a reaction tank with a capacity of 30 m or 500 a, a reaction was carried out in the same manner as in Comparative Example 1 under the reaction conditions shown in the following table.
得られた炭量カルシウムの形状を次表に示す。The shape of the obtained charcoal calcium is shown in the table below.
第１図は実施例１の繊維状炭酸カル／ラムの繊維形状を
示す走査型電子顕微鏡写真、第２図は比較例１の角状炭
酸力ルンウムの繊維形状を示す走査型電子顕微鏡写真で
ある。FIG. 1 is a scanning electron micrograph showing the fiber shape of the fibrous carbonate cal/rum of Example 1, and FIG. 2 is a scanning electron micrograph showing the fiber shape of the angular carbonate carbonate of Comparative Example 1. .
Claims (1)
ルシウムを製造するに当り、反応槽中に二酸化炭素を吹
き込み、水酸化カルシウム水性懸濁液を連続的に導入す
るとともに、反応槽中のカルシウムイオン濃度が０．０
０１〜０．００５ｍｏｌ／ｌの範囲になるように二酸化
炭素及び水酸化カルシウム水性懸濁液の供給量を調整し
、かつ反応槽内の温度を５０〜１００℃に保ちながら、
反応を行うことを特徴とする、平均粒子径が長径１０〜
１００μｍ、かつ短径０．１〜３．０μｍである繊維状
炭酸カルシウムの製造方法。1. When producing calcium carbonate by reacting calcium hydroxide and carbon dioxide, carbon dioxide is blown into the reaction tank, an aqueous calcium hydroxide suspension is continuously introduced, and the calcium ion concentration in the reaction tank is is 0.0
While adjusting the supply amount of carbon dioxide and calcium hydroxide aqueous suspension to be in the range of 0.01 to 0.005 mol/l, and maintaining the temperature in the reaction tank at 50 to 100°C,
Characterized by the ability to carry out a reaction, the average particle diameter is 10 to 10-
A method for producing fibrous calcium carbonate having a width of 100 μm and a short axis of 0.1 to 3.0 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18236588A JPH075302B2 (en) | 1988-07-21 | 1988-07-21 | Method for producing fibrous calcium carbonate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18236588A JPH075302B2 (en) | 1988-07-21 | 1988-07-21 | Method for producing fibrous calcium carbonate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0234514A true JPH0234514A (en) | 1990-02-05 |
| JPH075302B2 JPH075302B2 (en) | 1995-01-25 |
Family
ID=16117039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18236588A Expired - Fee Related JPH075302B2 (en) | 1988-07-21 | 1988-07-21 | Method for producing fibrous calcium carbonate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH075302B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1280735A4 (en) * | 2000-03-06 | 2003-07-09 | 3P Technologies Ltd | Precipitated aragonite and a process for producing it |
| WO2003020642A3 (en) * | 2001-09-05 | 2003-09-25 | 3P Technologies Ltd | Precipitated aragonite and a process for producing it |
| US6685908B1 (en) * | 2000-03-06 | 2004-02-03 | 3P Technologies Ltd. | Precipitated aragonite and a process for producing it |
| JP2008273853A (en) * | 2007-04-26 | 2008-11-13 | New Raimu Kenkyusha:Kk | Cosmetic composition |
| CN103539188A (en) * | 2013-10-30 | 2014-01-29 | 成都新柯力化工科技有限公司 | Preparation method of calcium carbonate fibers |
| JP2014524876A (en) * | 2011-06-21 | 2014-09-25 | オムヤ インターナショナル アーゲー | Method for producing precipitated calcium carbonate, precipitated calcium carbonate and use thereof |
-
1988
- 1988-07-21 JP JP18236588A patent/JPH075302B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1280735A4 (en) * | 2000-03-06 | 2003-07-09 | 3P Technologies Ltd | Precipitated aragonite and a process for producing it |
| US6685908B1 (en) * | 2000-03-06 | 2004-02-03 | 3P Technologies Ltd. | Precipitated aragonite and a process for producing it |
| WO2003020642A3 (en) * | 2001-09-05 | 2003-09-25 | 3P Technologies Ltd | Precipitated aragonite and a process for producing it |
| JP2008273853A (en) * | 2007-04-26 | 2008-11-13 | New Raimu Kenkyusha:Kk | Cosmetic composition |
| JP2014524876A (en) * | 2011-06-21 | 2014-09-25 | オムヤ インターナショナル アーゲー | Method for producing precipitated calcium carbonate, precipitated calcium carbonate and use thereof |
| CN103539188A (en) * | 2013-10-30 | 2014-01-29 | 成都新柯力化工科技有限公司 | Preparation method of calcium carbonate fibers |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH075302B2 (en) | 1995-01-25 |
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