JP5637345B2 - Carbon dioxide treatment method - Google Patents
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- JP5637345B2 JP5637345B2 JP2009064843A JP2009064843A JP5637345B2 JP 5637345 B2 JP5637345 B2 JP 5637345B2 JP 2009064843 A JP2009064843 A JP 2009064843A JP 2009064843 A JP2009064843 A JP 2009064843A JP 5637345 B2 JP5637345 B2 JP 5637345B2
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Description
本発明は、カルシウム溶液に炭酸ガスを接触させて、炭酸カルシウムを生成させる炭酸ガスの処理方法に関する。 The present invention relates to a method for treating carbon dioxide, which produces calcium carbonate by bringing carbon dioxide into contact with a calcium solution.
従来、炭酸ガスを処理する方法として、炭酸ガスを含む気体を、水と、アルカリ土類金属含有物質と、弱塩基と強酸との塩とから得られる水溶液に、接触させてアルカリ土類金属の炭酸塩を生成させる方法が知られている（例えば、特許文献１参照）。この方法では、安価で簡便に炭酸ガスを処理するために、アルカリ土類金属含有物質として、天然鉱物、廃材、製造工程で排出される副産物、セメント水和固形物で固化させたコンクリート、コンクリートを含む建築廃材または粉砕物、鉄鋼スラグ、ソーダ石灰ガラス、カリ石灰ガラス、石炭灰、焼却灰、煤塵等を用いることが検討されている。また、この方法により生成する炭酸塩は、例えば炭酸カルシウムの場合では、製鉄用の副原料、セメント用原料、耐火物原料、製紙填料、地盤改良材、肥料、環境浄化プロセル用原料、充填材、工業用原料等に利用される。 Conventionally, as a method for treating carbon dioxide, a gas containing carbon dioxide is brought into contact with an aqueous solution obtained from water, an alkaline earth metal-containing substance, and a salt of a weak base and a strong acid to thereby form an alkaline earth metal. A method for producing carbonate is known (for example, see Patent Document 1). In this method, in order to treat carbon dioxide gas inexpensively and easily, natural minerals, waste materials, by-products discharged in the manufacturing process, concrete solidified with cement hydrated solids, and concrete are used as alkaline earth metal-containing substances. The use of building waste materials or pulverized materials, steel slag, soda lime glass, potash lime glass, coal ash, incinerated ash, dust, etc. is being studied. Further, the carbonate produced by this method is, for example, in the case of calcium carbonate, an auxiliary raw material for iron making, a raw material for cement, a refractory raw material, a paper filler, a ground improvement material, a fertilizer, a raw material for an environmental purification process cell, a filler, Used for industrial raw materials.
従来の炭酸ガスの処理方法では、これまで、前記特許文献１に記載された方法のようにアルカリ土類金属等の原料を供給・確保することや生成する炭酸塩を再利用することについては検討されてきた。しかし、炭酸ガスの処理方法において、生成する炭酸塩自体に注目されることはなかった。
In the conventional carbon dioxide treatment method, it has been studied to supply and secure raw materials such as alkaline earth metals and reuse the generated carbonate as in the method described in
本発明は上記問題に鑑み案出されたものであり、炭酸塩として炭酸カルシウムが生成する炭酸ガスの処理方法において、生成する炭酸カルシウムの粒成長を制御できる炭酸ガスの処理方法を提供することを目的とする。 The present invention has been devised in view of the above problems, and provides a carbon dioxide gas treatment method capable of controlling grain growth of the produced calcium carbonate in a carbon dioxide gas treatment method in which calcium carbonate is produced as a carbonate. Objective.
上記目的を達成するための本発明に係る炭酸ガスの処理方法の第１特徴手段は、ｐＨ７以上のカルシウム溶液に炭酸ガスを接触させて、炭酸カルシウムを生成させる炭酸ガスの処理方法において、前記カルシウム溶液を、前記炭酸カルシウムの粒成長の促進・抑制がｐＨに依存するカルシウム濃度０．００１≦［Ｃａ2+］（ｍｏｌ／５００ｍＬ）≦０．０４に維持すると共に、前記カルシウム溶液のｐＨを７〜９の範囲に設定し、ｐＨが１０〜１２．８の範囲で生成させる炭酸カルシウムよりも粒径の大きい炭酸カルシウムを生成させる点にある。 In order to achieve the above object, the first characteristic means of the carbon dioxide gas treatment method according to the present invention is the carbon dioxide gas treatment method for producing calcium carbonate by bringing carbon dioxide gas into contact with a calcium solution having a pH of 7 or higher. The solution is maintained at a calcium concentration of 0.001 ≦ [Ca 2+ ] (mol / 500 mL) ≦ 0.04, in which the promotion / suppression of the calcium carbonate grain growth depends on the pH, and the pH of the calcium solution is 7 It is in the point which produces | generates a calcium carbonate with a larger particle size than the calcium carbonate set to the range of -9 and pH produced | generated in the range of 10-12.8 .
本手段によれば、カルシウム溶液のカルシウム濃度（以下、［Ｃａ2+］と記載する場合がある）とｐＨとを調整するだけで、生成する炭酸カルシウムの粒径を容易に制御することができる。また、炭酸ガスを処理すると共に、利用用途に応じた粒径の炭酸カルシウムを提供することができるため、炭酸カルシウムの付加価値が高まり、全体として処理コストを下げることができる。 According to this means, the particle size of the calcium carbonate to be generated can be easily controlled simply by adjusting the calcium concentration of the calcium solution (hereinafter sometimes referred to as [Ca 2+ ]) and the pH. . Moreover, since carbon dioxide having a particle size corresponding to the intended use can be provided while treating carbon dioxide, the added value of calcium carbonate is increased, and the processing cost can be reduced as a whole.
カルシウム溶液のｐＨを７〜９の範囲に維持することにより、生成する炭酸カルシウムの粒成長を促進させて、炭酸カルシウムの粒径を容易に制御することができる。By maintaining the pH of the calcium solution in the range of 7 to 9, the particle growth of the calcium carbonate to be generated can be promoted and the particle size of the calcium carbonate can be easily controlled.
また、カルシウム溶液のｐＨを１０〜１２．８の範囲に維持することにより、生成する炭酸カルシウムの粒成長を抑制し、炭酸カルシウムの生成を促進させて、炭酸カルシウムの粒径を容易に制御することができる。Further, by maintaining the pH of the calcium solution in the range of 10 to 12.8, the grain growth of the generated calcium carbonate is suppressed, the generation of calcium carbonate is promoted, and the particle diameter of the calcium carbonate is easily controlled. be able to.
本発明に係る炭酸ガスの処理方法の第２特徴手段は、前記カルシウム溶液に水酸化カルシウムを添加して、前記カルシウム溶液のｐＨを前記所定の範囲に維持する点にある。 The second characteristic means of the method for treating carbon dioxide gas according to the present invention is that calcium hydroxide is added to the calcium solution to maintain the pH of the calcium solution in the predetermined range.
炭酸カルシウムの生成により、カルシウム溶液のｐＨは低下する。また、水酸化カルシウムは安価で取り扱い易い。このため、カルシウム溶液のｐＨが低下した場合に、本手段のように水酸化カルシウムを添加すれば、簡便にｐＨを上昇させて所定の範囲に維持することができる。 Due to the formation of calcium carbonate, the pH of the calcium solution decreases. In addition, calcium hydroxide is inexpensive and easy to handle. For this reason, when the pH of the calcium solution is lowered, if calcium hydroxide is added as in this means, the pH can be easily raised and maintained within a predetermined range.
本発明に係る炭酸ガスの処理方法は、ｐＨ７以上のカルシウム溶液に炭酸ガスを接触させて、炭酸カルシウムを生成させる炭酸ガスの処理方法において、前記カルシウム溶液を、前記炭酸カルシウムの粒成長の促進・抑制がｐＨに依存するカルシウム濃度に維持すると共に、前記カルシウム溶液のｐＨを所定の範囲に維持して、前記炭酸カルシウムの粒成長を制御する。すなわち、本発明者らは、炭酸ガスを接触させるカルシウム溶液に着目し、カルシウム溶液のカルシウム濃度とｐＨとによって、生成する炭酸カルシウムの粒径が変化することを見出した。この方法によれば、カルシウム溶液のカルシウム濃度とｐＨとをそれぞれ所定の範囲に維持しながら炭酸ガスを接触させることにより、生成する炭酸カルシウムの粒径を制御することができる。また、炭酸ガスを処理すると共に、利用用途に応じた粒径の炭酸カルシウムを提供することができるため、炭酸カルシウムの付加価値が高まり、全体として処理コストを下げることができる。 The carbon dioxide treatment method according to the present invention is a carbon dioxide treatment method in which carbon dioxide is brought into contact with a calcium solution having a pH of 7 or more to produce calcium carbonate. The calcium solution is used to promote the growth of calcium carbonate grains. Inhibition is maintained at a calcium concentration that depends on the pH, and the pH of the calcium solution is maintained within a predetermined range to control grain growth of the calcium carbonate. That is, the present inventors paid attention to a calcium solution in contact with carbon dioxide gas, and found that the particle size of the generated calcium carbonate changes depending on the calcium concentration and pH of the calcium solution. According to this method, the particle diameter of the calcium carbonate to be generated can be controlled by contacting the carbon dioxide gas while maintaining the calcium concentration and pH of the calcium solution in a predetermined range. Moreover, since carbon dioxide having a particle size corresponding to the intended use can be provided while treating carbon dioxide, the added value of calcium carbonate is increased, and the processing cost can be reduced as a whole.
本発明における炭酸ガスは、純粋な炭酸ガスに限らず、炭酸ガスを含む気体であれば適用できる。例えば、液化天然ガス（ＬＮＧ）・液化石油ガス（ＬＰ）等の気体燃料、ガソリン・軽油等の液体燃料、石炭等の固体燃料等を燃焼させて発生する燃焼排ガス等を炭酸ガスとして用いることができる。 The carbon dioxide gas in the present invention is not limited to pure carbon dioxide gas, and any gas containing carbon dioxide gas can be applied. For example, gaseous fuel such as liquefied natural gas (LNG) and liquefied petroleum gas (LP), liquid fuel such as gasoline and light oil, and combustion exhaust gas generated by burning solid fuel such as coal are used as carbon dioxide gas. it can.
本発明に用いるカルシウム溶液は、特に限定されないが、例えば、キュポラスラグや高炉スラグ等のスラグを２０〜５００μｍ程度に粉砕し、酸または水に溶解させることで調製可能である。スラグは２０〜１００μｍに粉砕して使用することが特に好ましい。スラグをこの程度まで粉砕するとカルシウム分が粉砕物の表面に現れるため、酸を用いなくても水によって好ましく溶解可能となる。もちろん、従来公知の水酸化カルシウム等のカルシウム化合物を添加することによってもカルシウム溶液は調製可能である。 Although the calcium solution used for this invention is not specifically limited, For example, it can prepare by grind | pulverizing slags, such as cupola slag and blast furnace slag, to about 20-500 micrometers, and making it melt | dissolve in an acid or water. The slag is particularly preferably used after being pulverized to 20 to 100 μm. When the slag is pulverized to this extent, calcium content appears on the surface of the pulverized product, so that it can be preferably dissolved in water without using an acid. Of course, a calcium solution can also be prepared by adding a conventionally known calcium compound such as calcium hydroxide.
カルシウム溶液は、生成する炭酸カルシウムの粒成長にｐＨ依存性が生じるカルシウム濃度に設定する。例えば、カルシウム溶液のカルシウム濃度は、１．０×１０-8.3≦［Ｃａ2+］（ｍｏｌ／Ｌ）となるように設定することが好ましい。［Ｃａ2+］［ＣＯ3 2-］＝Ｋｓｐ＝５．４×１０-9であることから、カルシウム濃度を上記の濃度に設定すれば、ＣＯ3 2-の濃度に関わらず、炭酸カルシウムを析出させて生成させることができる。そして、この濃度において、カルシウム溶液のｐＨを調整すれば、炭酸カルシウムの粒径が制御し易くなる。尚、カルシウム濃度はスラグ等の溶解量によって調整することができる。 The calcium solution is set to a calcium concentration at which pH dependence occurs in the grain growth of the generated calcium carbonate. For example, the calcium concentration of the calcium solution is preferably set to satisfy 1.0 × 10 −8.3 ≦ [Ca 2+ ] (mol / L). Since [Ca 2+ ] [CO 3 2− ] = Ksp = 5.4 × 10 −9 , if the calcium concentration is set to the above-mentioned concentration, calcium carbonate can be used regardless of the CO 3 2− concentration. It can be formed by precipitation. If the pH of the calcium solution is adjusted at this concentration, the particle size of the calcium carbonate can be easily controlled. The calcium concentration can be adjusted by the amount of slag or the like dissolved.
カルシウム溶液のｐＨは、炭酸カルシウムの生成により低下するため、７以上の所定の範囲に維持する。例えば、生成する炭酸カルシウムの粒成長を抑え、粒子の生成を促進させる場合には、ｐＨを１０〜１２．８の範囲に維持することが好ましい。炭酸カルシウムの粒成長を促進させる場合には、ｐＨを７〜９の範囲に維持することが好ましい。また、カルシウム溶液のｐＨを１０〜１２．８の範囲から７〜９の範囲に変動させながら炭酸ガスを接触させれば、ｐＨが１０〜１２．８の範囲では炭酸カルシウムの粒子の生成が促進され、ｐＨが７〜９の範囲になると生成した炭酸カルシウムの粒成長が促進される。このため、ｐＨを変動させる範囲を調整して炭酸カルシウムの粒成長を制御することで、求める粒径の炭酸カルシウムを生成させることができる。カルシウム溶液のｐＨは、スラグを溶解させることでｐＨ７以上のアルカリ性となるため、スラグの溶解量を変えることで任意に調整可能である。もちろん、酸、アルカリ等の従来公知のｐＨ調整剤を添加することによってｐＨを調製することもできる。炭酸カルシウムの生成に伴い、カルシウム溶液のｐＨが低下した場合には、スラグやカルシウム含有塩基性物質またはカルシウム含有物と塩基とを成分とする溶液（水酸化カルシウム等が例示される）等を添加することにより、ｐＨを所定に範囲に維持することができる。ｐＨ調整剤を添加することによってもｐＨを所定の範囲に維持することはできるが、スラグやカルシウム含有塩基性物質またはカルシウム含有物と塩基とを成分とする溶液を添加すれば、同時にカルシウムを補充することもできる。尚、カルシウム溶液には、その他の各種添加剤や不純物等が混合されていても何ら構わない。 Since the pH of the calcium solution decreases due to the formation of calcium carbonate, it is maintained in a predetermined range of 7 or more. For example, when the grain growth of the generated calcium carbonate is suppressed and the generation of particles is promoted, the pH is preferably maintained in the range of 10 to 12.8. When promoting the growth of calcium carbonate grains, the pH is preferably maintained in the range of 7-9. Moreover, if the carbon dioxide gas is brought into contact while changing the pH of the calcium solution from the range of 10 to 12.8 to the range of 7 to 9, the generation of calcium carbonate particles is promoted in the range of the pH of 10 to 12.8. When the pH is in the range of 7-9, grain growth of the generated calcium carbonate is promoted. For this reason, it is possible to generate calcium carbonate having a desired particle diameter by adjusting the range in which pH is varied to control the grain growth of calcium carbonate. Since the pH of the calcium solution becomes alkaline with a pH of 7 or more by dissolving the slag, it can be arbitrarily adjusted by changing the dissolved amount of the slag. Of course, the pH can also be adjusted by adding a conventionally known pH adjusting agent such as acid or alkali. If the pH of the calcium solution decreases with the formation of calcium carbonate, add slag, a calcium-containing basic substance, or a solution containing a calcium-containing substance and a base (such as calcium hydroxide). By doing so, the pH can be maintained within a predetermined range. Although the pH can be maintained within a predetermined range by adding a pH adjuster, calcium can be replenished at the same time by adding a slag, a calcium-containing basic substance, or a solution containing a calcium-containing substance and a base as components. You can also The calcium solution may be mixed with other various additives and impurities.
炭酸ガスのカルシウム溶液への接触は、従来公知の方法により行うことができ、特に制限はない。例えば、カルシウム溶液に炭酸ガスをバブリングする（吹き込む）方法、カルシウム溶液と炭酸ガスとを同一容器に封入して振とうする方法等が挙げられる。また、炭酸ガスとして燃焼排ガス等を用いる場合には、カルシウム溶液と接触させる前に吸着フィルタ等を通過させて、塵埃、炭酸ガス以外のガス等を除去することもできる。尚。カルシウム溶液は、任意の温度で使用できるが、温度は高いほど炭酸ガスが溶け込み難くなるため、常温（５〜３５℃）で使用することが好ましく、５〜２５℃で使用することがより好ましい。 The contact of the carbon dioxide gas with the calcium solution can be performed by a conventionally known method and is not particularly limited. For example, a method of bubbling (blowing) carbon dioxide into a calcium solution, a method of shaking a calcium solution and carbon dioxide enclosed in the same container, and the like can be mentioned. Moreover, when using combustion exhaust gas etc. as a carbon dioxide gas, before making it contact with a calcium solution, it can also pass an adsorption filter etc., and can remove gas other than dust and a carbon dioxide gas. still. The calcium solution can be used at any temperature, but the higher the temperature, the more difficult the carbon dioxide gas dissolves. Therefore, the calcium solution is preferably used at room temperature (5-35 ° C.), more preferably 5-25 ° C.
本発明の炭酸ガスの処理方法により生成した炭酸カルシウムは、ろ過等の従来公知の方法によって回収することができる。回収した炭酸カルシウムは、例えば、製紙、顔料、塗料、プラスチック、ゴム、織編物等の産業において充填材として利用することができる。 The calcium carbonate produced by the carbon dioxide treatment method of the present invention can be recovered by a conventionally known method such as filtration. The recovered calcium carbonate can be used as a filler in industries such as papermaking, pigments, paints, plastics, rubber, woven and knitted fabrics.
以下に、本発明を用いた実施例を示し、本発明をより詳細に説明する。但し、本発明はこれらの実施例に限定されるものではない。 Hereinafter, examples using the present invention will be shown to describe the present invention in more detail. However, the present invention is not limited to these examples.
炭酸ガスの処理は、図１に示す装置で行った。すなわち、反応容器１にカルシウム溶液を入れ、攪拌機２を用いて４００ｒｐｍで攪拌しながら、炭酸ガスとして模擬燃焼排ガスをカルシウム溶液液中に導入してバブリングし、析出した炭酸カルシウムを調べた。炭酸ガスとカルシウム溶液との反応状況は、計測計７でカルシウム溶液の酸化還元電位及びｐＨを測定することにより調べた。導入後のカルシウム溶液に吸収されなかった炭酸ガスの濃度は、ガスクロマトグラフ８によって測定した。尚、９は逆流防止装置、３はカルシウム溶液の温度を調整する水浴槽である。
Carbon dioxide treatment was performed with the apparatus shown in FIG. That is, while putting a calcium solution into the
カルシウム溶液は、蒸留水５００ｍｌに水酸化カルシウム（Ｃａ(ＯＨ)2）を添加し、カルシウム（Ｃａ）濃度、ｐＨを調整し、室温で用いた。 The calcium solution was used at room temperature by adding calcium hydroxide (Ca (OH) 2 ) to 500 ml of distilled water to adjust the calcium (Ca) concentration and pH.
模擬燃焼排ガスは、炭酸ガス（ＣＯ2）と窒素（Ｎ2）ガスとの混合ガスを用いた。模擬燃焼排ガスは、炭酸ガスと窒素ガスとを、それぞれ流量調整器４，５で流量を調整し、混合装置６において所定の混合比で混合して供給する。
本実施例では、模擬燃焼排ガスを１０ｖｏｌ％ＣＯ2−９０ｖｏｌ％Ｎ2に調整し、１リットル／分でカルシウム溶液に導入した。
As the simulated combustion exhaust gas, a mixed gas of carbon dioxide (CO 2 ) and nitrogen (N 2 ) gas was used. The simulated combustion exhaust gas is supplied with carbon dioxide gas and nitrogen gas mixed at a predetermined mixing ratio in the
In this example, the simulated combustion exhaust gas was adjusted to 10 vol% CO 2 -90 vol% N 2 and introduced into the calcium solution at 1 liter / min.
カルシウム溶液のｐＨを７〜９の範囲に維持した場合（以下、ｐＨ８と示す場合がある）とｐＨを１０〜１２．８（１２．８は水酸化カルシウムの飽和溶解度に相当するｐＨ）の範囲に維持した場合（以下、ｐＨ１１と示す場合がある）とにおいて、カルシウム濃度（水酸化カルシウムの投入量）を変えて模擬燃焼排ガスを導入し、生成する炭酸カルシウムの粒径を調べた。その結果、図２に示すように、カルシウム濃度が０．００１≦［Ｃａ2+］（ｍｏｌ／５００ｍＬ）≦０．０４においては、炭酸カルシウムの粒径は、それぞれのｐＨでカルシウム濃度に関わらず略一定であったが、ｐＨ８の方がｐＨ１１に比べて大きくなっていた。また、カルシウム濃度が０．０４＜［Ｃａ2+］（ｍｏｌ／５００ｍＬ）≦０．２においては、いずれのｐＨもカルシウム濃度の増加に伴い、炭酸カルシウムの粒径が大きくなっており、カルシウム濃度が０．１ｍｏｌ／５００ｍＬの付近以降では、炭酸カルシウムの粒径はｐＨ１１の方がｐＨ８よりも大きくなっていた。
したがって、カルシウム濃度が０．００１≦［Ｃａ2+］（ｍｏｌ／５００ｍＬ）≦０．０４の時に炭酸カルシウムの粒成長の促進・抑制がｐＨに依存しており、ｐＨ８では粒成長が促進され、ｐＨ１１では粒成長が抑制されて粒子の生成が優先されることが分かった。また、０．０４＜［Ｃａ2+］（ｍｏｌ／５００ｍＬ）≦０．２の時には、炭酸カルシウムの粒成長の促進・抑制にｐＨ依存性はなく、いずれのｐＨの場合も粒成長が促進されることが分かった。
When the pH of the calcium solution is maintained in the range of 7 to 9 (hereinafter sometimes referred to as pH 8) and the pH is in the range of 10 to 12.8 (12.8 is a pH corresponding to the saturated solubility of calcium hydroxide). In this case (hereinafter sometimes referred to as pH 11), the simulated combustion exhaust gas was introduced while changing the calcium concentration (input amount of calcium hydroxide), and the particle diameter of the generated calcium carbonate was examined. As a result, as shown in FIG. 2, when the calcium concentration is 0.001 ≦ [Ca 2+ ] (mol / 500 mL) ≦ 0.04, the particle size of calcium carbonate is independent of the calcium concentration at each pH. Although it was substantially constant,
Therefore, when the calcium concentration is 0.001 ≦ [Ca 2+ ] (mol / 500 mL) ≦ 0.04, the promotion / suppression of grain growth of calcium carbonate depends on pH, and at
以上により、本実施例においては、カルシウム溶液のカルシウム濃度及びｐＨと、生成する炭酸カルシウムの粒径との関係は、図３に示す通りである。すなわち、炭酸カルシウムの粒成長の促進・抑制がｐＨに依存するカルシウム濃度は０．０４ｍｏｌ／５００ｍＬ以下であり、ｐＨ１０を境に、ｐＨが１０〜１２．８の場合のように大きくなると粒成長が抑制されると共に粒子の生成が優先され、ｐＨが７〜９の場合のように小さくなると粒成長が促進される。尚、カルシウム濃度が０．０４ｍｏｌ／５００ｍＬを越えた場合には、ｐＨに関わらず粒成長が促進される。
このため、本実施例の条件においては、カルシウム濃度は、０．５×１０-8.3≦［Ｃａ2+］（ｍｏｌ／５００ｍＬ）≦０．０４の範囲に維持することが好ましく、０．００１≦［Ｃａ2+］（ｍｏｌ／５００ｍＬ）≦０．０４の範囲に維持することがより好ましい。
As described above, in this embodiment, the relationship between the calcium concentration and pH of the calcium solution and the particle size of the generated calcium carbonate is as shown in FIG. That is, the calcium concentration that depends on the pH for the promotion and suppression of the grain growth of calcium carbonate is 0.04 mol / 500 mL or less, and when the pH is increased from 10 to 12.8, In addition to being suppressed, the generation of particles is prioritized, and when the pH is reduced as in the case of 7 to 9, grain growth is promoted. In addition, when the calcium concentration exceeds 0.04 mol / 500 mL, grain growth is promoted regardless of pH.
Therefore, under the conditions of this example, the calcium concentration is preferably maintained in the range of 0.5 × 10 −8.3 ≦ [Ca 2+ ] (mol / 500 mL) ≦ 0.04, and 0.001 ≦ It is more preferable to maintain in the range of [Ca 2+ ] (mol / 500 mL) ≦ 0.04.
本発明の炭酸ガスの処理方法は、燃焼排ガス中の炭酸ガス等の処理に適用することができる。 The method for treating carbon dioxide of the present invention can be applied to the treatment of carbon dioxide in combustion exhaust gas.
Claims (2)
前記カルシウム溶液を、前記炭酸カルシウムの粒成長の促進・抑制がｐＨに依存するカルシウム濃度０．００１≦［Ｃａ2+］（ｍｏｌ／５００ｍＬ）≦０．０４に維持すると共に、
前記カルシウム溶液のｐＨを７〜９の範囲に設定し、ｐＨが１０〜１２．８の範囲で生成させる炭酸カルシウムよりも粒径の大きい炭酸カルシウムを生成させる炭酸ガスの処理方法。 In the carbon dioxide treatment method for producing calcium carbonate by bringing carbon dioxide into contact with a calcium solution having a pH of 7 or more,
The calcium solution is maintained at a calcium concentration of 0.001 ≦ [Ca 2+ ] (mol / 500 mL) ≦ 0.04, in which the promotion and suppression of the grain growth of the calcium carbonate depends on the pH,
A method for treating carbon dioxide, wherein the calcium solution is set to a pH of 7 to 9, and calcium carbonate having a particle diameter larger than that of calcium carbonate generated at a pH of 10 to 12.8 is generated .
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