JPH0699148B2 - Method for producing light calcium carbonate - Google Patents
Method for producing light calcium carbonateInfo
- Publication number
- JPH0699148B2 JPH0699148B2 JP26054389A JP26054389A JPH0699148B2 JP H0699148 B2 JPH0699148 B2 JP H0699148B2 JP 26054389 A JP26054389 A JP 26054389A JP 26054389 A JP26054389 A JP 26054389A JP H0699148 B2 JPH0699148 B2 JP H0699148B2
- Authority
- JP
- Japan
- Prior art keywords
- lime milk
- calcium carbonate
- temperature
- light calcium
- conductivity
- 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.)
- Expired - Lifetime
Links
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title claims description 54
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims description 26
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 36
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 36
- 239000004571 lime Substances 0.000 claims description 36
- 239000008267 milk Substances 0.000 claims description 33
- 235000013336 milk Nutrition 0.000 claims description 33
- 210000004080 milk Anatomy 0.000 claims description 33
- 239000013078 crystal Substances 0.000 claims description 32
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims 2
- 235000010216 calcium carbonate Nutrition 0.000 description 23
- 239000007789 gas Substances 0.000 description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- -1 hexagonal system Chemical compound 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
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
- C01F11/181—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、紙、プラスチック、ゴム等に充填料として
使用される軽質炭酸カルシュウムの製造方法に関する。
軽質炭酸カルシュウムの中でもその結晶構造が板状のも
のは、紙等の表面コーティング剤として、また、その結
晶構造が連鎖（繊維）状のものは内填用として用いられ
る。この発明は、石灰乳に炭酸ガスを作用させて炭酸カ
ルシュウムを製造する上で、上述のような板状結晶の軽
質炭酸カルシュウム及び連鎖状結晶の軽質炭酸カルシュ
ウムの混在物を所望にしたがって選択製造することがで
きる製造方法を提案するものである。Description: TECHNICAL FIELD The present invention relates to a method for producing light calcium carbonate used as a filler in paper, plastic, rubber and the like.
Among light calcium carbonates, those having a plate-like crystal structure are used as surface coating agents for paper and the like, and those having a chain (fiber) crystal structure are used for internal filling. This invention selectively manufactures a mixture of plate-like crystalline light calcium carbonate and chain-like crystalline calcium carbonate as described above in producing calcium carbonate by causing carbon dioxide gas to act on lime milk. It proposes a possible manufacturing method.
〔従来の技術〕 従来、軽質炭酸カルシュウムは、六方晶系、六角板状
晶、連鎖状結晶、板状結晶のもの等、それぞれの一種類
のみの製造がおこなわれてきた。[Prior Art] Conventionally, only one kind of light calcium carbonate such as hexagonal system, hexagonal plate crystal, chain crystal, and plate crystal has been manufactured.
（特公昭62−32130号参照） 〔発明が解決しようとする問題点〕 このため、例えば、六角板状晶の軽質炭酸カルシュウム
を紙の塗工用として使用した場合、破断に対する強度が
不足する。そこで、板状のものと連鎖状のものとを混合
して使用することが考えられるが、使用するためには、
混合機が必要であり、また、粉体を均一に混合すること
はむつかしい。(See Japanese Patent Publication No. 62-32130) [Problems to be Solved by the Invention] Therefore, for example, when hexagonal plate-shaped light calcium carbonate is used for coating paper, the strength against breakage is insufficient. Therefore, it is possible to use a mixture of a plate-shaped material and a chain-shaped material, but in order to use it,
A mixer is required and it is difficult to mix the powders uniformly.
この発明は、石灰乳と炭酸ガスを反応させて軽質炭酸カ
ルシュウムを製造する過程において、その反応を制御す
ることによって、その結晶構造が板状のもの、連鎖状の
もの、およびこれらの混在するものと、その用途によっ
て必要な結晶構造のものを製造できるようにしたもので
あって、その要旨とするところは、石灰乳に、石灰焼成
炉の排ガスを導入して反応させ、軽質炭酸カルシュウム
を製造するに当り、反応中の石灰乳の温度と電気電導度
を測定して反応を制御し、その反応温度と電気伝導度に
対応する結晶構造の軽質炭酸カルシュウムを得るように
したものである。The present invention, in the process of producing light calcium carbonate by reacting lime milk and carbon dioxide gas, by controlling the reaction, its crystal structure is plate-like, chain-like, or a mixture of these. And, the thing that makes it possible to produce the necessary crystal structure depending on the application, and the gist of it is to introduce the exhaust gas of the lime firing furnace into lime milk and react it to produce light calcium carbonate In doing so, the temperature and electric conductivity of lime milk during the reaction are measured to control the reaction, and light calcium carbonate having a crystal structure corresponding to the reaction temperature and electric conductivity is obtained.
すなわち、石灰乳に、炭酸ガスを約30％含む石灰焼成炉
の排ガスを導入すると、炭酸カルシュウムが生成する
が、この炭酸カルシュウムの生成すること等によって一
時的に石灰乳の電導度が低下したのち一転上昇し、反応
をさらに継続させると二次的に石灰乳の電導度が低下す
る。発明者は、実験の結果この電導度の二次降下時に生
成されている炭酸カルシュウムの結晶構造は、排ガスと
反応させる石灰乳の初温および一時電導度の降下のあと
の石灰乳の温度に関連することを知得て、この知見に基
づいて新規な軽質炭酸カルシュウムの製造方法を完成し
たものである。That is, when flue gas of a lime baking furnace containing about 30% carbon dioxide is introduced into lime milk, calcium carbonate is produced, but after the calcium carbonate is produced, the conductivity of lime milk is temporarily reduced. When the temperature rises once more and the reaction is further continued, the conductivity of lime milk decreases secondarily. As a result of the experiment, the inventor has found that the crystal structure of calcium carbonate generated during the secondary drop of the conductivity is related to the initial temperature of the lime milk to be reacted with the exhaust gas and the temperature of the lime milk after the temporary decrease of the conductivity. Based on this finding, a new method for producing light calcium carbonate was completed.
以下、添付の図に基づき前述石灰乳の温度と電導度の関
係を詳述する。第１図は、石灰乳を低温度範囲で上昇さ
せて排ガスと反応させ、その電導度の変化を測定したも
ので、反応初期の石灰乳の温度は略10℃、一時降下時の
電導度7ms/cmであり、石灰乳の温度が略25℃に上昇した
とき、二次降下した電導度は3ms/cmであった。その後、
石灰乳の温度を30℃以下に抑え、電導度が二次的に3ms/
cmに降下したとき反応を停止させた。このようにして生
成した軽質炭酸カルシュウムの結晶構造は第４図として
示す写真の如く、板状の結晶構造であった。Hereinafter, the relationship between the temperature and the conductivity of the lime milk will be described in detail with reference to the accompanying drawings. Fig. 1 shows lime milk that was raised in a low temperature range to react with exhaust gas, and the change in its electrical conductivity was measured. The temperature of lime milk at the beginning of the reaction was approximately 10 ° C, and the electrical conductivity during a temporary drop was 7 ms. / cm, and when the temperature of lime milk increased to about 25 ° C, the second-decreased conductivity was 3 ms / cm. afterwards,
The temperature of lime milk is kept below 30 ° C, and the conductivity is secondarily 3ms /
The reaction was stopped when it dropped to cm. The light calcium carbonate thus produced had a plate-like crystal structure as shown in the photograph of FIG.
次に、第２図は、初温が略９℃の石灰乳を排ガスと反応
させ、その電導度が約7ms/cmに一次的に降下したのちに
石灰乳を40℃迄加熱し乍ら排ガスと反応させ、その電導
度が約3ms/cmに二次的に降下したところで反応を停止さ
せたものである。このように反応させて生成した軽質炭
酸カルシュウムの結晶構造は、第５図の写真に示すよう
に成長した板状結晶に連鎖状結晶の混在したものであっ
た。Next, Fig. 2 shows that lime milk with an initial temperature of about 9 ° C is reacted with exhaust gas, and its conductivity temporarily drops to about 7ms / cm, and then lime milk is heated to 40 ° C to generate exhaust gas. The reaction was stopped when the conductivity secondarily dropped to about 3 ms / cm. The crystal structure of the light calcium carbonate produced by the reaction as described above was a mixture of chain-like crystals in the grown plate-like crystals as shown in the photograph of FIG.
次に、第３図は、初温が約９℃の石灰乳を排ガスと反応
させ、その電導度が約7ms/cmに一次的に降下したのち
に、石灰乳を50℃以上に急速に加熱し、その電導度が約
3ms/cmに二次的に降下したところで反応を停止させたも
のである。このように反応させて生成した軽質炭酸カル
シュウムの結晶構造は、第６図に示すように、その柱が
長く成長した（４μｍ程度）連鎖状結晶に板状結晶が混
在したものであった。Next, Fig. 3 shows that lime milk with an initial temperature of about 9 ° C is reacted with exhaust gas, and its conductivity temporarily drops to about 7 ms / cm, after which lime milk is rapidly heated to 50 ° C or higher. And its conductivity is about
The reaction was stopped when the secondary fall to 3 ms / cm. As shown in FIG. 6, the crystal structure of the light calcium carbonate produced by the reaction as described above was such that plate-like crystals were mixed with chain-like crystals in which the pillars grew long (about 4 μm).
以上の説明で明らかなように、石灰乳と排ガスを反応さ
せて軽質炭酸カルシュウムを製造する場合、石灰乳の初
期の温度を略10℃としてこれに排ガスを反応させて、そ
の電導度が一次的に低下したのちも、加熱することなく
自然昇温で30℃以下で反応を継続させると板状結晶構造
のものを得ることができ、一次的電導度の降下ののちに
石灰乳を加熱してその温度を40℃と上昇させると板状結
晶中に連鎖状の結晶が混在するようになり、さらに、温
度を50℃以上に上昇させることで連鎖状の結晶が主体と
なり、これが成長することが判明した。As is clear from the above description, when light calcium carbonate is produced by reacting lime milk with exhaust gas, the initial temperature of lime milk is set to about 10 ° C. and the exhaust gas is reacted therewith, and its electrical conductivity is primary. Even after the temperature has dropped to 0, it is possible to obtain a plate-shaped crystal structure by continuing the reaction at 30 ° C or less at a natural temperature rise without heating, and heating the lime milk after the decrease in the primary conductivity. When the temperature is raised to 40 ° C, chain crystals become mixed in the plate crystal, and further, when the temperature is raised to 50 ° C or higher, the chain crystal becomes the main component, and this can grow. found.
石灰乳（CaOとして約５％）を温度10℃に保ち、CO2はCa
O1000gに対して約1/186の重量ｇのCO2を毎分反応槽に導
入すると共に石灰乳を強制撹拌しつつ、その電導度が一
次降下して上昇後反応液（石灰乳）を加温することなく
反応を続行させ、その電導度が二次的に降下して３〜4m
s/cmを示したとき反応を停止させ、板状の結晶構造の軽
質炭酸カルシュウムを得た。Maintaining lime milk (about 5% as CaO) to a temperature 10 ° C., CO 2 is Ca
About 1/186 weight g of CO 2 is introduced into the reaction tank every minute and the lime milk is forcibly stirred and the conductivity of the lime milk is first lowered to increase the temperature of the reaction liquid (lime milk). The reaction is continued without being carried out, and the conductivity drops secondarily to 3-4m.
When s / cm was exhibited, the reaction was stopped and light calcium carbonate having a plate-like crystal structure was obtained.
以上の説明で明らかなように、この発明に係る方法によ
れば、簡単な反応温度の制御操作および電導度の測定で
所望の結晶構造の軽質炭酸カルシュウムを製造すること
ができるものであり、然も、使用目的に適合するものを
選択して製造できるもので、工業的に使用して著大な利
益を得ることができるものである。As is clear from the above description, according to the method of the present invention, it is possible to produce light calcium carbonate having a desired crystal structure by a simple control operation of reaction temperature and measurement of electric conductivity. Also, it is possible to select and manufacture the one suitable for the purpose of use, and it is possible to obtain a great profit by industrially using it.
第１図は軽質炭酸カルシュウムを製造する際における石
灰乳の温度と電導度の関係グラフで板状結晶構造のもの
を製造する場合のもの、第２図および第３図は同じく、
板状結晶と連鎖状結晶の混在する結晶構造のものを製造
する場合のもの、第４図は板状結晶構造の軽質炭酸カル
シュウムの顕微鏡写真、第５図および第６図はそれぞ
れ、板状結晶と連鎖状結晶と混在する軽質炭酸カルシュ
ウムの顕微鏡写真である。FIG. 1 is a graph showing the relationship between the temperature and the electrical conductivity of lime milk during the production of light calcium carbonate in the case of producing a plate-like crystal structure, and FIGS. 2 and 3 are the same.
When manufacturing a crystal structure having a mixture of plate crystals and chain crystals, FIG. 4 is a micrograph of light calcium carbonate having a plate crystal structure, and FIGS. 5 and 6 are plate crystals, respectively. 2 is a photomicrograph of light calcium carbonate mixed with and chain crystals.
Claims (2)
応させ軽質炭酸カルシュウムを製造するに当りCaOとCO2
の反応速度を所定の割合いにし、石灰乳の初温を８〜15
℃とし、石灰乳と排ガスが反応してその電導度が６〜8m
s/cmに降下後上昇したのち、石灰乳を加熱してその温度
を略40℃迄上昇させ、その電導度が二次的に２〜4ms/cm
に降下したとき、反応を停止させることを特長とする板
状結晶と連鎖状結晶の混在する軽質炭酸カルシュウムの
製造方法1. CaO and CO 2 for producing light calcium carbonate by introducing exhaust gas from a lime baking furnace into lime milk and reacting
The reaction rate of is set to a predetermined ratio, and the initial temperature of lime milk is 8 to 15
℃, lime milk reacts with exhaust gas and its electrical conductivity is 6-8m
After descending to s / cm and rising, lime milk is heated to raise its temperature to about 40 ° C, and its conductivity is secondarily 2-4ms / cm.
Method for producing light calcium carbonate in which plate crystals and chain crystals are mixed, characterized by stopping the reaction when the temperature drops to
を所定の割合にし８℃〜15℃温度の石灰乳と排ガスが反
応してその電導度が６〜8ms/cmに降下後上昇したのち、
その石灰乳を加熱してその温度を急速に50℃以上に上昇
させ、その石灰乳の電導度が二次的に２〜4ms/cmに降下
したとき反応を停止させることを特長とする連鎖状結晶
を主体とする板状軽質炭酸カルシュウムの製造方法。2. The method according to claim 1, wherein the reaction rate of CaO and CO 2 is set to a predetermined ratio and lime milk at a temperature of 8 ° C. to 15 ° C. reacts with the exhaust gas to reduce the conductivity to 6 to 8 ms / cm. After rising
A chain-like feature characterized by heating the lime milk to rapidly raise its temperature to 50 ° C or higher, and stopping the reaction when the conductivity of the lime milk drops secondarily to 2 to 4 ms / cm. A method for producing plate-like light calcium carbonate mainly composed of crystals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26054389A JPH0699148B2 (en) | 1989-10-04 | 1989-10-04 | Method for producing light calcium carbonate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26054389A JPH0699148B2 (en) | 1989-10-04 | 1989-10-04 | Method for producing light calcium carbonate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03261618A JPH03261618A (en) | 1991-11-21 |
| JPH0699148B2 true JPH0699148B2 (en) | 1994-12-07 |
Family
ID=17349420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26054389A Expired - Lifetime JPH0699148B2 (en) | 1989-10-04 | 1989-10-04 | Method for producing light calcium carbonate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0699148B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1079697C (en) * | 1998-05-04 | 2002-02-27 | 李成义 | Producing chemical product by using sugar manufacturing equipment of sugar refinery |
| US7056419B2 (en) * | 2002-09-30 | 2006-06-06 | American Air Liquide, Inc. | Methods for modifying electrical properties of papermaking compositions using carbon dioxide |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6232130B2 (en) | 2013-11-29 | 2017-11-15 | シージェイ ヘルスケア コーポレイションＣｊ Ｈｅａｌｔｈｃａｒｅ Ｃｏｒｐｏｒａｔｉｏｎ | Method for purifying darbepoetin alfa |
-
1989
- 1989-10-04 JP JP26054389A patent/JPH0699148B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6232130B2 (en) | 2013-11-29 | 2017-11-15 | シージェイ ヘルスケア コーポレイションＣｊ Ｈｅａｌｔｈｃａｒｅ Ｃｏｒｐｏｒａｔｉｏｎ | Method for purifying darbepoetin alfa |
Non-Patent Citations (2)
| Title |
|---|
| Ｇｙｐｓｕｍ＆ＬｉｍｅＮｏ．１９４（１９８５）Ｐ．３〜１２ |
| Ｇｙｐｓｕｍ＆ＬｉｍｅＮｏ．１９６（１９８５）Ｐ．１３０〜１４０ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03261618A (en) | 1991-11-21 |
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