JPH06271313A - Production of spindle-shaped light calcium carbonate - Google Patents
Production of spindle-shaped light calcium carbonateInfo
- Publication number
- JPH06271313A JPH06271313A JP6004593A JP6004593A JPH06271313A JP H06271313 A JPH06271313 A JP H06271313A JP 6004593 A JP6004593 A JP 6004593A JP 6004593 A JP6004593 A JP 6004593A JP H06271313 A JPH06271313 A JP H06271313A
- Authority
- JP
- Japan
- Prior art keywords
- calcium carbonate
- light calcium
- spindle
- shaped light
- 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.)
- Pending
Links
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Paper (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、紙の填料として好適な
紡錘状軽質炭酸カルシウムの製造方法に関する。FIELD OF THE INVENTION The present invention relates to a process for producing spindle-shaped light calcium carbonate suitable as a filler for paper.
【０００２】[0002]
【従来の技術】従来の紡錘状軽質炭酸カルシウムを製造
する方法では、石灰乳と１０〜４０容量％の濃度で供給
されるＣＯ2ガスを使用するため、粒径の揃った紡錘状
軽質炭酸カルシウムを製造することができる。但し、上
記の様なＣＯ2ガスを確保し、供給するためには、かな
り大規模な設備を要し、また、コストアップとなってい
るのが現状である。2. Description of the Related Art In the conventional method for producing a spindle-shaped light calcium carbonate, since lime milk and CO 2 gas supplied at a concentration of 10 to 40% by volume are used, the spindle-shaped light calcium carbonate having a uniform particle size is used. Can be manufactured. However, in order to secure and supply the CO 2 gas as described above, a considerably large-scale facility is required and the cost is increased at present.
【０００３】上記従来の方法で製造された紡錘状軽質炭
酸カルシウムの市販品は、一般的に粒径が２μｍよりも
大きいものの割合が増加する傾向にある。粒径の大きな
ものは、紙の白色度、不透明度に悪影響を与えるので好
ましくないものである。In the commercial products of the spindle-shaped light calcium carbonate produced by the above-mentioned conventional method, the proportion of particles having a particle size larger than 2 μm generally tends to increase. A material having a large particle size is not preferable because it adversely affects the whiteness and opacity of the paper.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上記の粒径
の大きなものの割合を少なくすることを課題とするもの
である。本発明は、安価な燃焼炉における低濃度のＣＯ
2ガスを用い、紙の内填用として好ましい粒径に揃える
ことのできる紡錘状の軽質炭酸カルシウムの製造方法を
提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to reduce the proportion of the above-mentioned particles having a large particle size. The present invention provides a low concentration CO in an inexpensive combustion furnace.
An object of the present invention is to provide a method for producing spindle-shaped light calcium carbonate, which can be made to have a preferable particle size for paper filling by using 2 gases.
【０００５】[0005]
【課題を解決するための手段】本発明は、石灰乳とＣＯ
２ガスを反応させて紡錘状の軽質炭酸カルシウムを製造
する方法において、ＣａＯ純度９０％以上、ＣＯ2残留
率３％以下、粒度３〜１０mmの生石灰を用いて、濃度５
０〜６２ｇ／ｌの範囲の石灰乳を調製し、５０〜６５℃
の該石灰乳にＣＯ2濃度が９容量％以下のＣＯ2ガスを吹
き込み反応させ、紡錘状軽質炭酸カルシウムの平均粒径
を１〜２μｍにすることを特徴とする紡錘状軽質炭酸カ
ルシウムの製造方法である。The present invention relates to lime milk and CO
In the method for producing spindle-shaped light calcium carbonate by reacting two gases, CaO purity is 90% or more, CO 2 residual rate is 3% or less, and quick lime having a particle size of 3 to 10 mm is used to obtain a concentration of 5%.
Prepare lime milk in the range of 0 to 62 g / l, 50 to 65 ° C
A method for producing a spindle-shaped light calcium carbonate, characterized in that CO 2 gas having a CO 2 concentration of 9% by volume or less is blown into the lime milk to cause a reaction so that the average particle diameter of the spindle-shaped light calcium carbonate is 1 to 2 μm. Is.
【０００６】本発明は、石灰乳濃度とＣＯ2ガス濃度を
制御することにより、紡錘状軽質炭酸カルシウムの平均
粒径を制御するものであり、その諸条件をいかに示す。The present invention controls the average particle size of spindle-shaped light calcium carbonate by controlling the lime milk concentration and the CO 2 gas concentration, and how the various conditions are shown.
【０００７】 石灰乳の原料である生石灰の品質は、
酸化カルシウム（ＣａＯ）純度９０％以上（蛍光Ｘ線に
て測定）、二酸化炭素（ＣＯ2）残留率が３％以下（熱
天秤にて測定）、粒度が３〜１０ｍｍのものである。Ｃ
ａＯ純度が９０％以下の場合は、不純物が多いので、Ｃ
ａＯが反応してＣａＣＯ3になる際の結晶成長を阻害す
る為好ましくない。ＣＯ2残留率が３％以上の場合は、
原料ＣａＯ中のＣａＣＯ3分の比率が多いという事で、
やはりこれも結晶成長を阻害する為、好ましくない。粒
度が３〜１０ｍｍの範囲を越えると、出来上がりの軽質
炭酸カルシウムの２μｍ以上の割合を増加させるので、
好ましくない。又、３〜１０ｍｍの範囲より小さいと出
来上りの軽質炭酸カルシウムの２μｍ以上の割合を減少
させるので、好ましくない。The quality of quicklime, a raw material of lime milk, is
Calcium oxide (CaO) purity is 90% or more (measured by fluorescent X-ray), carbon dioxide (CO 2 ) residual rate is 3% or less (measured by thermobalance), and particle size is 3 to 10 mm. C
If the aO purity is 90% or less, there are many impurities, so C
This is not preferable because it inhibits crystal growth when aO reacts to form CaCO 3 . If the CO 2 residual rate is 3% or more,
Since the ratio of CaCO 3 in the raw material CaO is high,
Again, this also hinders crystal growth and is not preferable. When the particle size exceeds the range of 3 to 10 mm, the ratio of the finished light calcium carbonate of 2 μm or more increases,
Not preferable. Further, if it is smaller than the range of 3 to 10 mm, the ratio of the finished light calcium carbonate of 2 μm or more is reduced, which is not preferable.
【０００８】 石灰乳の濃度は、５０〜６２ｇ／ｌの
範囲であれば良いが、好ましくは５５〜６２ｇ／ｌであ
る。６２ｇ／ｌを越えると出来上りの軽質炭酸カルシウ
ムの２μｍ以上の割合を増加させるので好ましくない。
又、５０ｇ／ｌより小さいと出来上りの軽質炭酸カルシ
ウムの２μｍ以上の割合を減少させるので、これも好ま
しくない。The concentration of lime milk may be in the range of 50 to 62 g / l, but is preferably 55 to 62 g / l. If it exceeds 62 g / l, the proportion of the finished light calcium carbonate of 2 μm or more increases, which is not preferable.
Also, if it is less than 50 g / l, the ratio of the finished light calcium carbonate of 2 μm or more is reduced, which is also not preferable.
【０００９】 石灰乳の温度は５０〜６５℃の範囲で
あれば良いが、好ましくは５６〜６２℃である。６５℃
を越えると反応速度が遅くなる為製造原単位（コスト）
の面から好ましくない。又、５０℃より低いと結晶形が
変化し、紡錘状のものが減少するので好ましくない。The temperature of the lime milk may be in the range of 50 to 65 ° C., but is preferably 56 to 62 ° C. 65 ° C
Per unit of production (cost) because the reaction speed becomes slower
It is not preferable from the viewpoint of. On the other hand, if the temperature is lower than 50 ° C., the crystal form changes and the spindle-shaped ones decrease, which is not preferable.
【００１０】 ＣＯ2ガス濃度は９容量％以下の範囲
であれば良いが、好ましくは５〜９容量％であり、工程
で排出される排ガスを用いれば良く、例えばクラフトパ
ルプ製造工程のライムキルン等の安価な排ガスを使用す
ることが可能である。The CO 2 gas concentration may be in the range of 9% by volume or less, but is preferably 5 to 9% by volume, and the exhaust gas discharged in the process may be used, such as lime kiln in the kraft pulp manufacturing process. It is possible to use cheap exhaust gas.
【００１１】 ＣＯ2ガス温度は、好ましくは５０〜
６５℃の範囲で用いられる。この範囲を外れると、低い
場合は反応温度を低くし、高い場合は反応温度を高くす
るので好ましくない。The CO 2 gas temperature is preferably 50-
Used in the range of 65 ° C. When it is out of this range, the reaction temperature is lowered when it is low, and the reaction temperature is raised when it is high, which is not preferable.
【００１２】上記の条件の組合わせにより、紡錘状軽質
炭酸カルシウムの粒度分布は、２μｍ以下の累積％が６
０％以上で、平均粒径が１．５±０．５μｍのものが得
られる。累積％とは、得られた炭酸カルシウムの粒径分
布を光透過式粒度分布測定器を用いて測定し、２μｍ以
下のものの累積を全体に対する比率で表したものであ
る。By the combination of the above conditions, the particle size distribution of the spindle-shaped light calcium carbonate has a cumulative% of 2 μm or less of 6%.
A content of 0% or more and an average particle size of 1.5 ± 0.5 μm is obtained. The cumulative% is a value obtained by measuring the particle size distribution of the obtained calcium carbonate using a light transmission type particle size distribution measuring device and expressing the cumulative value of particles having a particle size of 2 μm or less as a ratio to the whole.
【００１３】[0013]
【実施例】以下に実施例を挙げて本発明を説明する。EXAMPLES The present invention will be described below with reference to examples.
【００１４】実施例１ ＣａＯ純度９５．０％、ＣＯ2残留率０．５％、粒度３
〜１０mmの生石灰１．１３ｔと４５℃の水を混合して２
０ｍ3とし、１７rpm で約３時間撹拌し、約５６．６ｇ
／ｌの石灰乳２０ｍ3を調製し、この時の石灰乳の温度
は５６℃であった。該５６℃の石灰乳にＣＯ2約５容量
％のＣＯ2ガスを、石灰乳２０ｍ3に対して２０Ｎｍ３／
分の割合で吹き込み続け、９時間反応させた。反応終了
後、約７６．５ｇ／ｌの軽質炭酸カルシウムスラリーを
得た。得られたスラリーを遠心分離機にて３６３ｇ／ｌ
まで濃縮した。得られた紡錘状軽質炭酸カルシウムの粒
径の結果を表１に示す。また、得られた紡錘状軽質炭酸
カルシウムを紙に内填した場合の物性データの結果を表
２に示す。Example 1 CaO purity 95.0%, CO 2 residual rate 0.5%, particle size 3
Mix 1.13t of 10mm quicklime with water at 45 ° C for 2
0m 3 and stir at 17 rpm for about 3 hours, about 56.6g
20 m 3 of lime milk of 1 / l was prepared, and the temperature of the lime milk at this time was 56 ° C. The CO 2 about 5 volume% of CO 2 gas into milk of lime of the 56 ° C., 20 Nm against lime milk 20 m 3 3 /
Blowing was continued at a rate of minutes and reaction was carried out for 9 hours. After completion of the reaction, a light calcium carbonate slurry of about 76.5 g / l was obtained. The resulting slurry is centrifuged at 363 g / l
Concentrated to. The results of the particle diameter of the obtained spindle-shaped light calcium carbonate are shown in Table 1. In addition, Table 2 shows the results of physical property data when the obtained spindle-shaped light calcium carbonate was internally filled in paper.
【００１５】実施例２ 実施例１の石灰乳の濃度を６０ｇ／ｌにした以外は実施
例１と同様に行った。結果を表１に示す。Example 2 Example 2 was repeated except that the concentration of lime milk in Example 1 was changed to 60 g / l. The results are shown in Table 1.
【００１６】実施例３ 実施例１のＣＯ2ガスの濃度を８容量％にした以外は実
施例１と同様に行った。結果を表１に示す。Example 3 Example 1 was repeated except that the concentration of CO 2 gas in Example 1 was changed to 8% by volume. The results are shown in Table 1.
【００１７】実施例４ 実施例１の石灰乳の温度を６２℃にした以外は実施例１
と同様に行った。結果を表１に示す。Example 4 Example 1 except that the temperature of the lime milk of Example 1 was set to 62 ° C.
I went the same way. The results are shown in Table 1.
【００１８】比較例１ 実施例１の石灰乳の濃度を６６．７ｇ／ｌにした以外は
実施例１と同様に行った。結果を表１に示す。Comparative Example 1 Example 1 was repeated except that the lime milk concentration in Example 1 was changed to 66.7 g / l. The results are shown in Table 1.
【００１９】比較例２ 実施例１の石灰乳の濃度を６６．７ｇ／ｌに、ＣＯ2ガ
スの濃度を８容量％にした以外は、実施例１と同様に行
った。結果を表１に示す。Comparative Example 2 The procedure of Example 1 was repeated, except that the lime milk concentration of Example 1 was 66.7 g / l and the CO 2 gas concentration was 8% by volume. The results are shown in Table 1.
【００２０】[0020]
【表１】 [Table 1]
【００２１】[0021]
【発明の効果】本発明は、ＣＯ2源として、ＣＯ2が低濃
度の排ガス等を利用するため、安価であり、設備的にも
大きな改造や設備導入を必要としない。また、本発明の
方法によれば、例えば紙の内填用として市販されている
軽質炭酸カルシウムとまったく同等の特性を有した紡錘
状軽質炭酸カルシウムを得ることができ、問題なく使用
することができる。INDUSTRIAL APPLICABILITY The present invention uses an exhaust gas or the like having a low concentration of CO 2 as a CO 2 source, so that it is inexpensive and does not require major modification or installation of equipment. Further, according to the method of the present invention, it is possible to obtain spindle-shaped light calcium carbonate having exactly the same characteristics as those of light calcium carbonate commercially available for paper filling, and it can be used without problems. .
Claims (1)
の軽質炭酸カルシウムを製造する方法において、ＣａＯ
純度９０％以上、ＣＯ2残留率３％以下、粒度３〜１０m
mの生石灰を用いて、濃度５０〜６２ｇ／ｌの範囲の石
灰乳を調製し、５０〜６５℃の該石灰乳にＣＯ2濃度が
９容量％以下のＣＯ2ガスを吹き込み反応させ、紡錘状
軽質炭酸カルシウムの平均粒径を１〜２μｍにすること
を特徴とする紡錘状軽質炭酸カルシウムの製造方法。1. A method for producing spindle-shaped light calcium carbonate by reacting lime milk with CO 2 gas, wherein CaO is used.
Purity 90% or more, CO 2 residual rate 3% or less, particle size 3 to 10 m
A lime milk having a concentration in the range of 50 to 62 g / l was prepared using m quicklime, and CO 2 gas having a CO 2 concentration of 9% by volume or less was blown into the lime milk at 50 to 65 ° C. to cause a reaction. A method for producing a spindle-shaped light calcium carbonate, characterized in that the light calcium carbonate has an average particle diameter of 1 to 2 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6004593A JPH06271313A (en) | 1993-03-19 | 1993-03-19 | Production of spindle-shaped light calcium carbonate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6004593A JPH06271313A (en) | 1993-03-19 | 1993-03-19 | Production of spindle-shaped light calcium carbonate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06271313A true JPH06271313A (en) | 1994-09-27 |
Family
ID=13130720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6004593A Pending JPH06271313A (en) | 1993-03-19 | 1993-03-19 | Production of spindle-shaped light calcium carbonate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06271313A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015516358A (en) * | 2012-03-23 | 2015-06-11 | オムヤ インターナショナル アーゲー | Method for preparing declinated trihedral precipitated calcium carbonate |
| CN109502622A (en) * | 2018-11-21 | 2019-03-22 | 上海碳酸钙厂有限公司 | A kind of preparation method of medicinal precipitated calcium carbonate |
| KR20220149195A (en) * | 2021-04-30 | 2022-11-08 | 주식회사 우룡 | Method of manufacturing calcium carbonate |
-
1993
- 1993-03-19 JP JP6004593A patent/JPH06271313A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015516358A (en) * | 2012-03-23 | 2015-06-11 | オムヤ インターナショナル アーゲー | Method for preparing declinated trihedral precipitated calcium carbonate |
| JP2016164116A (en) * | 2012-03-23 | 2016-09-08 | オムヤ インターナショナル アーゲー | Method for preparing scalenohedral precipitated calcium carbonate |
| US9981855B2 (en) | 2012-03-23 | 2018-05-29 | Omya International Ag | Process for preparing scalenohedral precipitated calcium carbonate |
| CN109502622A (en) * | 2018-11-21 | 2019-03-22 | 上海碳酸钙厂有限公司 | A kind of preparation method of medicinal precipitated calcium carbonate |
| KR20220149195A (en) * | 2021-04-30 | 2022-11-08 | 주식회사 우룡 | Method of manufacturing calcium carbonate |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6251356B1 (en) | High speed manufacturing process for precipitated calcium carbonate employing sequential perssure carbonation | |
| AU756269B2 (en) | Method of producing synthetic silicates and use thereof in glass production | |
| JP3995761B2 (en) | Method for producing light calcium carbonate | |
| JP6970469B1 (en) | Calcium carbonate manufacturing method | |
| EP0826630B1 (en) | Method of producing synthethic silicates and use thereof in glass production | |
| JP4249115B2 (en) | Method for producing strontium carbonate fine particles | |
| JPH06271313A (en) | Production of spindle-shaped light calcium carbonate | |
| JP3860834B2 (en) | Co-production method of calcium carbonate and sodium hydroxide | |
| JP3874449B2 (en) | Method for producing light calcium carbonate | |
| US3592674A (en) | Method of preparing a calcium carbonate-magnesium hydroxide pigment and the pigment produced | |
| JP2011225390A (en) | Method for producing spindle-like light calcium carbonate | |
| JPS5926927A (en) | Preparation of fusiform calcium carbonate crystal | |
| JP2604202B2 (en) | Method for producing spindle-shaped calcium carbonate | |
| JPH0656422A (en) | Production of spindle-like calcium carbonate | |
| JP3924019B2 (en) | Method for producing light calcium carbonate | |
| JP2002234726A (en) | Continuous producing method of calcium carbonate | |
| JPH07196317A (en) | Production of precipitated calcium carbonate light | |
| CN116528963A (en) | Method for producing calcium carbonate and calcium carbonate | |
| JP2000086237A (en) | Production of spindle shaped calcium carbonate | |
| JPH0130766B2 (en) | ||
| JPH0360774B2 (en) | ||
| JPH0319165B2 (en) | ||
| JP2004284952A (en) | Indium oxide-tin oxide powder | |
| JP3626620B2 (en) | Method for producing calcium carbonate | |
| JP2958838B2 (en) | Method for producing light calcium carbonate for internal use in papermaking |