JPH0673690A - Production of precipitated light calcium carbonate for papermaking - Google Patents
Production of precipitated light calcium carbonate for papermakingInfo
- Publication number
- JPH0673690A JPH0673690A JP11675092A JP11675092A JPH0673690A JP H0673690 A JPH0673690 A JP H0673690A JP 11675092 A JP11675092 A JP 11675092A JP 11675092 A JP11675092 A JP 11675092A JP H0673690 A JPH0673690 A JP H0673690A
- Authority
- JP
- Japan
- Prior art keywords
- calcium carbonate
- light calcium
- papermaking
- lime milk
- surface area
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、製紙用軽質炭酸カルシ
ウムを製造する方法に関するものである。FIELD OF THE INVENTION The present invention relates to a method for producing light calcium carbonate for papermaking.
【０００２】[0002]
【従来の技術】炭酸カルシウムは従来からゴム、プラス
チック、塗料、製紙、インキなどの充填剤として広く使
用されてきた。このような炭酸カルシウムには大別して
天然の白色石灰石を機械的に粉砕して製造される重質炭
酸カルシウムと，水酸化カルシウム（石灰乳）と炭酸ガ
スを化学的に反応させて製造する軽質炭酸カルシウムと
に分類される。重質炭酸カルシウムは機械的な粉砕・分
級で製造するため、一般に平均粒子径が大きく、具体的
には１．０μm 以上あり、又粒度分布も非常に広範囲に
なっている。このため各分野での厳密な所望物性を満た
すためには不十分であり主として増量剤として使用され
ることが多い。2. Description of the Related Art Calcium carbonate has been widely used as a filler for rubber, plastics, paints, papers, inks and the like. Such calcium carbonate is roughly classified into heavy calcium carbonate produced by mechanically crushing natural white limestone and light carbonate produced by chemically reacting calcium hydroxide (lime milk) and carbon dioxide gas. It is classified as calcium. Since ground calcium carbonate is produced by mechanical pulverization and classification, it generally has a large average particle size, specifically 1.0 μm or more, and has a very wide particle size distribution. For this reason, it is insufficient to satisfy the strict desired physical properties in each field, and it is often used mainly as an extender.
【０００３】製紙業界では抄紙用填料として使用した場
合、抄紙機の脱水パ−トで使用されているワイヤ−に対
する摩耗性が大きく、操業性及び経済性（ワイヤ−ライ
フの縮小）などの問題がある一方軽質炭酸カルシウムは
化学反応によって合成させるため粒子径及び粒子形状を
ある程度調整することが可能であり粒度分布も非常に狭
い範囲に収まる。又、不純物の除去、硬度の低下により
製紙用填料としての上記問題もほぼ解消される。又、製
紙用の軽質炭酸カルシウムは、それを用いた紙、板紙の
品質上（特に不透明度）の観点から通常ＢＥＴ比表面積
６ｍ2 ／ｇ以上の物性が要求される。When used as a filler for papermaking in the papermaking industry, it has a large abrasion property with respect to the wire used in the dewatering part of the papermaking machine, resulting in problems such as operability and economy (shortening of wire life). On the other hand, since light calcium carbonate is synthesized by a chemical reaction, the particle size and particle shape can be adjusted to some extent, and the particle size distribution is also within a very narrow range. Also, the above problems as a papermaking filler are almost eliminated by removing impurities and decreasing hardness. Further, light calcium carbonate for papermaking is usually required to have physical properties of BET specific surface area of 6 m 2 / g or more from the viewpoint of the quality of paper and paperboard using the same (especially opacity).
【０００４】その物性を満足させる手段として生石灰の
品質、特に不純物の含有率及び焼成具合あるいは炭酸化
時の温度をコントロ−ルすることが定法であった。従っ
て製紙用内添軽質炭酸カルシウムの原料として使える生
石灰は限定されていた。又、炭酸化時の温度コントロ−
ルする場合でも比表面積を大きくするためには反応温度
を下げなければならず（２５℃以下）、そのためにコス
トがかかるという問題があった。As a means for satisfying the physical properties, it has been a standard method to control the quality of quicklime, especially the content of impurities and the firing condition or the temperature during carbonation. Therefore, quicklime that can be used as a raw material for lightly added calcium carbonate internally for papermaking has been limited. Also, the temperature control during carbonation
However, even if the reaction is carried out, the reaction temperature has to be lowered (25 ° C. or less) in order to increase the specific surface area, which causes a problem of cost increase.
【０００５】[0005]
【発明が解決しようとする課題】本発明者らは各種生石
灰の成分と、それから通常の方法で合成して得られる軽
質炭酸カルシウムの比表面積との関係を調べた結果、生
石灰中の３価の金属酸化物（以下、Ｒ2 Ｏ3 という）含
有量が軽質炭酸カルシウムの比表面積に大きく影響する
ことを見出だした。すなわち、Ｒ2 Ｏ3 含有量が０．４
％（ＪＩＳ Ｒ９０１１の測定方法に準拠）以上の生石
灰からは従来の方法では比表面積６ｍ2 ／ｇ以上の軽質
炭酸カルシウムを合成することは不可能であった。DISCLOSURE OF THE INVENTION The present inventors have investigated the relationship between the components of various quicklimes and the specific surface area of light calcium carbonate obtained by synthesizing them by a usual method. It has been found that the content of metal oxide (hereinafter referred to as R 2 O 3 ) has a great influence on the specific surface area of light calcium carbonate. That is, the R 2 O 3 content is 0.4
% (According to the measurement method of JIS R9011) or more, it was impossible to synthesize light calcium carbonate having a specific surface area of 6 m 2 / g or more by a conventional method from quicklime.
【０００６】本発明の目的は、生石灰の品質を選ばず製
紙用軽質炭酸カルシウムとして好適な比表面積６ｍ2 ／
ｇ以上の軽質炭酸カルシウムを合成することにある。単
に比表面積を上げる方法としては従来の方法で合成した
軽質炭酸カルシウム自体を粉砕し比表面積を上げる方法
も考えられるが粒度が下がることにより抄紙用として用
いた場合、歩留まりが下がるという好ましくない問題が
発生する。The object of the present invention is to select a specific surface area of 6 m 2 / which is suitable as a light calcium carbonate for papermaking regardless of the quality of quicklime.
It is to synthesize more than g of light calcium carbonate. As a method of simply increasing the specific surface area, a method of crushing light calcium carbonate itself synthesized by a conventional method to increase the specific surface area can be considered, but when used for papermaking due to a decrease in particle size, there is an unfavorable problem that the yield decreases. Occur.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、かかる実
情に鑑み、軽質炭酸カルシウムの原料である生石灰の品
質、とりわけＲ2 Ｏ3 含有量で代表される不純物の多い
原料から製紙用内添に使用するに良好なＢＥＴ比表面積
６ｍ2 ／ｇ以上の軽質炭酸カルシウムを得んとして鋭意
研究の結果、炭酸化反応前に石灰乳を湿式粉砕すること
によりＢＥＴ比表面積６ｍ2 ／ｇ以上の軽質炭酸カルシ
ウムを製造することに成功したものである。SUMMARY OF THE INVENTION In view of the above situation, the present inventors have found that the quality of quicklime, which is a raw material for light calcium carbonate, and in particular, the use of a raw material containing a large amount of impurities represented by the content of R 2 O 3 for papermaking. As a result of earnest research to obtain light calcium carbonate having a BET specific surface area of 6 m 2 / g or more, which is good for use as an additive, as a result of wet grinding of lime milk before the carbonation reaction, a BET specific surface area of 6 m 2 / g or more was obtained. It has succeeded in producing light calcium carbonate.
【０００８】本発明において原料として用いられる生石
灰は、一般的なものに限らず各種のものが使用できる。
例えば、クラフトパルプ製造の薬品回収工程より発生す
る生石灰、中性抄紙工程より発生するスラッジの焼却灰
なども使用可能である。本発明では従来の製造工程では
製紙用軽質炭酸カルシウムとして不適であった、Ｒ2 Ｏ
3 含有量０．４％以上のものも使用できる。生石灰を消
和する条件としては特に制約はないがＣａＯ濃度が１０
〜３５重量％、反応開始温度３０〜６０℃で行うのが好
ましい。The quicklime used as a raw material in the present invention is not limited to general one, and various kinds can be used.
For example, quicklime generated in the chemical recovery process of kraft pulp production, incineration ash of sludge generated in the neutral papermaking process, and the like can also be used. In the present invention, R 2 O, which was unsuitable as a light calcium carbonate for papermaking in the conventional manufacturing process,
3 Content of 0.4% or more can also be used. There is no particular limitation on the condition for calcining quicklime, but CaO concentration is 10
It is preferable to carry out the reaction at a reaction starting temperature of 30 to 60 ° C.
【０００９】こうして出来た石灰乳の粉砕を行う。粉砕
前の濃度は特に制約はないが１０〜４０重量％が好まし
い。この濃度より低いと経済的に不利となるし、この濃
度より高いと作業性が悪くなる恐れがある。この粉砕の
方法はバッチ式、連続式のどちらでも良く、要するに生
成した水酸化カルシウム粒子を細かくするものならば良
い。例えば、リングロ−ラ−ミル・ボ−ルベアリングミ
ルのようなロ−ラミル、ケ−ジメル・スクリ−ンミルの
ような高速回転粉砕機、タワ−ミル・アトライタ−のよ
うな撹拌ミルのほかジェット粉砕機、剪断ミル、コロイ
ドミルなどの微粉砕機はもとより乳化器、分散機などで
も粉砕の効果が有るものならば使用出来る。粉砕の度合
いとして粉砕後の石灰乳が３。 ボ−メに希釈した１時間
後の沈降体積が６０％以上が望ましい。沈降体積が６０
％未満であると６ｍ2 ／ｇ以上の軽質炭酸カルシウムを
定法で合成することは困難である。The lime milk thus produced is crushed. The concentration before pulverization is not particularly limited, but is preferably 10 to 40% by weight. If it is lower than this concentration, it is economically disadvantageous, and if it is higher than this concentration, workability may be deteriorated. This pulverization method may be either a batch method or a continuous method, and in short, any method may be used so long as the produced calcium hydroxide particles are finely divided. For example, a roller mill such as a ring roller mill, a ball bearing mill, a high speed rotary crusher such as a Kedmel screen mill, a stirring mill such as a tower mill attritor, and a jet crusher. A fine pulverizer such as a shear mill or a colloid mill, as well as an emulsifier or a disperser can be used as long as it has a pulverizing effect. As the degree of crushing, lime milk after crushing was 3 . It is desirable that the sedimentation volume after 1 hour of diluting into the water is 60% or more. Settling volume is 60
If it is less than%, it is difficult to synthesize 6 m 2 / g or more of light calcium carbonate by a conventional method.
【００１０】本発明における炭酸化の条件として特に制
約は無いが石灰乳濃度３〜２０重量％、反応開始温度３
０〜６０℃、導入炭酸ガスはＣａ（ＯＨ）2 が１００ｇ
当たり０．１〜２リットル／分で行うのが好ましい。こ
こで使用するガスは必ずしも炭酸ガス１００％のもので
無くてもよく、窒素、不活性ガス、その他反応に寄与し
ないガスが混っていても炭酸ガスが含まれていれば差し
支えない。又、撹拌は石灰乳が均一に保たれる程度でよ
い。本発明の目的が達成される限り、分散剤、ＰＨ調整
剤、その他の添加剤が加えられてもよい。こうして得ら
れた軽質炭酸カルシウムは、ＢＥＴ比表面積６ｍ2／ｇ
以上の製紙用内添填料として使用することができる。There are no particular restrictions on the carbonation conditions in the present invention, but the lime milk concentration is 3 to 20% by weight, and the reaction start temperature is 3
0-60 ° C, introduced carbon dioxide gas is 100 g of Ca (OH) 2.
It is preferable to carry out at 0.1 to 2 liter / min. The gas used here does not necessarily have to be 100% carbon dioxide, and nitrogen, an inert gas, and other gases that do not contribute to the reaction may be mixed as long as carbon dioxide is contained. The stirring may be such that lime milk is kept uniform. Dispersants, pH adjusters, and other additives may be added as long as the object of the present invention is achieved. The light calcium carbonate thus obtained has a BET specific surface area of 6 m 2 / g.
It can be used as the above-mentioned internal filler for papermaking.
【００１１】[0011]
【作用】本発明は、炭酸化反応前に石灰乳を粉砕するこ
とに関するものである。詳しいことは不明であるが下記
のようなことが考えられる。得られる軽質炭酸カルシウ
ムは単結晶ではなく、コロイド粒子の凝集体と推測さ
れ、石灰乳をより細かくしたものを使用することによ
り、よりコロイド粒子が細かくなり、その結果表面の凸
凹が多くなることにより比表面積が大きくなるものと本
発明者らは推測する。The present invention relates to grinding lime milk before the carbonation reaction. Although details are unknown, the following may be considered. It is assumed that the obtained light calcium carbonate is not a single crystal, but an aggregate of colloidal particles, and by using a finer lime milk, the colloidal particles become finer, and as a result, the surface irregularities increase. The present inventors presume that the specific surface area becomes large.
【００１２】（実施例）以下、実施例により、本発明を
具体的に説明するが勿論これらに限定されるものではな
い。尚、特に断らない限り、例中の部及び％はそれぞれ
重量部及び重量％を示す。 実施例１ 粒径５〜２５ｍｍ、Ｒ2 Ｏ3 含有量が０．５３％の生石
灰１部を５部の５０℃の水道水４部に１時間撹拌しなが
ら消和し、これを１５０メッシュのスクリ−ンに通して
残査を除去し、２２％の石灰乳を得た。この石灰乳をダ
イノ−ミル（ウイリ−・エ・バッコ−フェン社：スイス
製）に１回通すことにより連続湿式粉砕した後、希釈し
て濃度８％の石灰乳を５ｋｇに調整した。処理後の沈降
体積は６６％であった。次いで細長形の６リットル容量
の反応容器で炭酸化を行った。反応終了後、１５０メッ
シュのスクリ−ンを通し、軽質炭酸カルシウムを得た。(Examples) The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, parts and% in the examples mean parts by weight and% by weight, respectively. Example 1 1 part of quicklime having a particle size of 5 to 25 mm and an R 2 O 3 content of 0.53% was soaked in 5 parts of 4 parts of tap water at 50 ° C. for 1 hour while stirring, and this was mixed with 150 parts of 150 mesh. The residue was removed by passing through a screen to obtain 22% lime milk. This lime milk was continuously wet-milled by passing it once through a Dyno-Mill (Willi-e-Baccofen Company, made in Switzerland) and then diluted to prepare 5 kg of lime milk having a concentration of 8%. The sedimentation volume after the treatment was 66%. Carbonation was then carried out in an elongated 6 liter capacity reaction vessel. After the reaction was completed, it was passed through a screen of 150 mesh to obtain light calcium carbonate.
【００１３】実施例２ 実施例１で得られた連続粉砕前の石灰乳をダイノ−ミル
に３回通して連続湿式粉砕し、沈降体積８４％の石灰乳
を得た以外は実施例１と同様にして軽質炭酸カルシウム
を得た。 実施例３ 実施例１で得られた連続粉砕前の石灰乳をダイノ−ミル
に５回通して連続湿式粉砕し、沈降体積９１％の石灰乳
を得た以外は実施例１と同様にして軽質炭酸カルシウム
を得た。Example 2 The same as Example 1 except that the lime milk obtained in Example 1 before continuous crushing was passed through a Dyno-mill three times to continuously wet crush it to obtain lime milk having a sedimentation volume of 84%. As a result, light calcium carbonate was obtained. Example 3 The lime milk obtained in Example 1 before continuous crushing was passed through a Dyno-mill 5 times to perform continuous wet crushing to obtain lime milk having a sedimentation volume of 91%, and lightness was obtained in the same manner as in Example 1. Obtained calcium carbonate.
【００１４】比較例１ 実施例１で得られた連続粉砕前の沈降体積３５％の石灰
乳を希釈して濃度８％に調整しそのまま、実施例１と同
様の炭酸化条件で炭酸化を行い、軽質炭酸カルシウムを
得た。 実施例４ 実施例１で得られた連続前の石灰乳をカウレス（島崎製
作所）に移し、周速５３００ｆｔ／分で３０分間分散・
湿式粉砕を行い、沈降体積６２％の石灰乳を得た以外は
実施例１と同様にして軽質炭酸カルシウムを得た。Comparative Example 1 The lime milk having a sedimentation volume of 35% before continuous pulverization obtained in Example 1 was diluted and adjusted to a concentration of 8%, and carbonation was carried out under the same carbonation conditions as in Example 1. , Light calcium carbonate was obtained. Example 4 The lime milk before continuous obtained in Example 1 was transferred to Cowles (Shimazaki Seisakusho) and dispersed at a peripheral speed of 5300 ft / min for 30 minutes.
Light calcium carbonate was obtained in the same manner as in Example 1 except that wet pulverization was performed to obtain lime milk having a sedimentation volume of 62%.
【００１５】実施例５ 実施例１で得られた連続粉砕前の石灰乳をカウレス（島
崎製作所）に移し、周速５３００ｆｔ／分で６０分間・
分散湿式粉砕を行い、沈降体積６８％の石灰乳を得た以
外は実施例１と同様にして軽質炭酸カルシウムを得た。
以上の実施例、比較例で得られた軽質炭酸カルシウムの
ＢＥＴ比表面積の値、及び使用例として手抄き紙物性値
を表１に示した。Example 5 The lime milk before continuous crushing obtained in Example 1 was transferred to Cowles (Shimazaki Seisakusho) and the peripheral speed was 5300 ft / min for 60 minutes.
Light calcium carbonate was obtained in the same manner as in Example 1 except that dispersion wet grinding was performed to obtain lime milk having a sedimentation volume of 68%.
Table 1 shows the BET specific surface area values of the light calcium carbonates obtained in the above Examples and Comparative Examples, and the physical properties of handmade paper as a usage example.
【００１６】[0016]
【表１】 [Table 1]
【００１７】評価方法 ＢＥＴ比表面積 フロ−ソ−ブII２３００（島津製作所製）を使用してＢ
ＥＴ一点法により測定した。 手抄き紙作成方法 ＴＴＳ式標準角型シ−トマシン（東洋精機製作所製）を
使用してＪＩＳ Ｐ８２０９、ＴＡＰＰＩ Ｔ２０５に
従い手抄き紙を作成した。 白色度 デジタルハンタ−反射率計（東洋精機製作所製）を使用
してＪＩＳ Ｐ８１２３に準拠した。 不透明度 デジタルハンタ−反射率計（東洋精機製作所製）を使用
してＪＩＳ Ｐ８１３８に準拠した。 実填料率 強熱温度を４５０℃にする以外はＪＩＳ Ｐ８１２８に
準拠した。Evaluation method BET specific surface area B was measured using Fro-Soave II2300 (manufactured by Shimadzu Corporation)
It was measured by the ET single point method. Method of making handmade paper A handmade paper was prepared according to JIS P8209 and TAPPI T205 using a TTS standard square sheet machine (manufactured by Toyo Seiki Seisakusho). Whiteness A digital hunter-reflectometer (manufactured by Toyo Seiki Seisaku-sho, Ltd.) was used to comply with JIS P8123. Opacity A digital hunter-reflectometer (manufactured by Toyo Seiki Seisakusho) was used to comply with JIS P8138. Actual filling rate According to JIS P8128 except that the ignition temperature was set to 450 ° C.
【００１８】[0018]
【発明の効果】本発明は、炭酸カルシウムを得る定法で
ＢＥＴ比表面製６ｍ2 ／ｇ以下となる生石灰を使用して
も消和反応後、その使用石灰乳を湿式粉砕した後炭酸化
することによりＢＥＴ比表面積６ｍ2 ／ｇ以上の軽質炭
酸カルシウムを得ることができ、生石灰の品質を選ばな
くとも使用できる。また、粉砕後の石灰乳は３。 ボ−メ
に希釈した１時間後の沈降体積が６０％以上とすること
により、製紙用軽質炭酸カルシウムとして好適な比表面
積６ｍ2 ／ｇ以上の軽質炭酸カルシウムを定法で容易に
合成することができる。INDUSTRIAL APPLICABILITY According to the present invention, even if quick lime having a BET specific surface area of 6 m 2 / g or less is used in a standard method for obtaining calcium carbonate, after the slaking reaction, the lime milk used is wet pulverized and then carbonated. As a result, light calcium carbonate having a BET specific surface area of 6 m 2 / g or more can be obtained, and it can be used regardless of the quality of quicklime. The lime milk after crushing was 3 . By adjusting the sedimentation volume after 1 hour of diluting to the brome to 60% or more, it is possible to easily synthesize light calcium carbonate having a specific surface area of 6 m 2 / g or more, which is suitable as a light calcium carbonate for papermaking, by a conventional method. .
【００１９】したがって、本発明によれば従来製紙用軽
質炭酸カルシウムの原料として使用できなかった生石灰
を使用できることから、以下の効果が期待できる。 （１）資源の有効利用につながる。 （２）原料生石灰の品質が変動しても安定した品質の軽
質炭酸カルシウムを合成できる。 （３）製紙工場内で本発明を適用した場合、製紙工場内
で発生する廃炭酸ガス、廃生石灰等を利用できるため、
廃棄物の有効利用ができ省資源となる。 以上のように本発明は産業的利用価値が極めて高いもの
である。Therefore, according to the present invention, quick lime which could not be used as a raw material of light calcium carbonate for papermaking can be used. Therefore, the following effects can be expected. (1) It leads to effective use of resources. (2) Light calcium carbonate of stable quality can be synthesized even if the quality of the raw material quicklime changes. (3) When the present invention is applied in a paper mill, waste carbon dioxide gas, waste quicklime, etc. generated in the paper mill can be used,
Waste can be effectively used and resources can be saved. As described above, the present invention has extremely high industrial utility value.
Claims (2)
シウムを合成する方法において、炭酸化反応前に石灰乳
を粉砕することを特徴とする製紙用軽質炭酸カルシウム
の製造方法。1. A method for synthesizing light calcium carbonate using lime milk and carbon dioxide, wherein lime milk is crushed before a carbonation reaction, and a method for producing light calcium carbonate for papermaking.
１時間後の沈降体積が６０％以上であることを特徴とす
る請求項１記載の製紙用軽質炭酸カルシウムの製造方
法。2. The method for producing light calcium carbonate for papermaking according to claim 1, wherein the lime milk after crushing has a sedimentation volume of 60% or more after 1 hour when diluted to 3 ° Baume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11675092A JPH0673690A (en) | 1992-04-10 | 1992-04-10 | Production of precipitated light calcium carbonate for papermaking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11675092A JPH0673690A (en) | 1992-04-10 | 1992-04-10 | Production of precipitated light calcium carbonate for papermaking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0673690A true JPH0673690A (en) | 1994-03-15 |
Family
ID=14694839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11675092A Pending JPH0673690A (en) | 1992-04-10 | 1992-04-10 | Production of precipitated light calcium carbonate for papermaking |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0673690A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996032354A1 (en) * | 1995-04-11 | 1996-10-17 | Ecc International Ltd. | Treatment of solid-containing material derived from effluent |
| WO1997028087A1 (en) * | 1996-01-31 | 1997-08-07 | Papiertechnische Stiftung | Process for producing calcium carbonate from calcium-containing residues |
| EP0798268A1 (en) * | 1996-03-29 | 1997-10-01 | Ecc International Limited | Treatment of solid containing material derived from effluent |
| JP2002233851A (en) * | 2001-02-13 | 2002-08-20 | Oji Paper Co Ltd | Particle coated with light calcium carbonate obtained by using calcination ash, its manufacturing method and paper made therefrom |
| US6719879B2 (en) | 1997-05-21 | 2004-04-13 | S & S Lime, Inc. | Method for kraft waste reclamation |
| JP2012158844A (en) * | 2011-01-31 | 2012-08-23 | Hokuetsu Kishu Paper Co Ltd | White paperboard |
| US8288312B2 (en) | 2007-03-06 | 2012-10-16 | S&S Lime, Inc. | Particulate matter and methods of obtaining same from a Kraft waste reclamation |
| EP2524898A1 (en) | 2011-05-16 | 2012-11-21 | Omya Development AG | Precipitated calcium carbonate from pulp mill waste having an improved brightness, method for the production and use thereof |
| JP2014125423A (en) * | 2012-12-27 | 2014-07-07 | Tosoh Corp | Method of manufacturing calcium hydroxide aqueous suspension |
| US9181103B2 (en) | 2010-06-11 | 2015-11-10 | Wetend Technologies Oy | Method and apparatus for in-line production of milk of lime into an in-line production process of PCC arranged in connection with a fibrous web machine |
| US10774471B2 (en) | 2018-01-31 | 2020-09-15 | Korea Institute Of Geoscience And Mineral Resource | Method of recycling by-product generated in papermaking process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5373498A (en) * | 1976-12-13 | 1978-06-29 | Shiraishi Kogyo Kaisha Ltd | Method of producing belllshaped calicium carbonate having diameters of 0*1 to 1*0 micrometer |
-
1992
- 1992-04-10 JP JP11675092A patent/JPH0673690A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5373498A (en) * | 1976-12-13 | 1978-06-29 | Shiraishi Kogyo Kaisha Ltd | Method of producing belllshaped calicium carbonate having diameters of 0*1 to 1*0 micrometer |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996032354A1 (en) * | 1995-04-11 | 1996-10-17 | Ecc International Ltd. | Treatment of solid-containing material derived from effluent |
| AU689715B2 (en) * | 1995-04-11 | 1998-04-02 | Ecc International Limited | Treatment of solid-containing material derived from effluent |
| WO1997028087A1 (en) * | 1996-01-31 | 1997-08-07 | Papiertechnische Stiftung | Process for producing calcium carbonate from calcium-containing residues |
| EP0798268A1 (en) * | 1996-03-29 | 1997-10-01 | Ecc International Limited | Treatment of solid containing material derived from effluent |
| US8088199B2 (en) | 1997-05-21 | 2012-01-03 | S&S Lime, Inc. | Method for kraft waste reclamation |
| US6719879B2 (en) | 1997-05-21 | 2004-04-13 | S & S Lime, Inc. | Method for kraft waste reclamation |
| JP4607351B2 (en) * | 2001-02-13 | 2011-01-05 | 奥多摩工業株式会社 | Light calcium carbonate-coated particles using calcined ash, method for producing the same, and paper using the same |
| JP2002233851A (en) * | 2001-02-13 | 2002-08-20 | Oji Paper Co Ltd | Particle coated with light calcium carbonate obtained by using calcination ash, its manufacturing method and paper made therefrom |
| US8288312B2 (en) | 2007-03-06 | 2012-10-16 | S&S Lime, Inc. | Particulate matter and methods of obtaining same from a Kraft waste reclamation |
| US9181103B2 (en) | 2010-06-11 | 2015-11-10 | Wetend Technologies Oy | Method and apparatus for in-line production of milk of lime into an in-line production process of PCC arranged in connection with a fibrous web machine |
| JP2012158844A (en) * | 2011-01-31 | 2012-08-23 | Hokuetsu Kishu Paper Co Ltd | White paperboard |
| EP2524898A1 (en) | 2011-05-16 | 2012-11-21 | Omya Development AG | Precipitated calcium carbonate from pulp mill waste having an improved brightness, method for the production and use thereof |
| WO2012156231A1 (en) | 2011-05-16 | 2012-11-22 | Omya Development Ag | Precipitated calcium carbonate from pulp mill waste having an improved brightness, method for the production and use thereof |
| JP2014125423A (en) * | 2012-12-27 | 2014-07-07 | Tosoh Corp | Method of manufacturing calcium hydroxide aqueous suspension |
| US10774471B2 (en) | 2018-01-31 | 2020-09-15 | Korea Institute Of Geoscience And Mineral Resource | Method of recycling by-product generated in papermaking process |
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