JP2020093222A - Method for manufacturing neutralizer comprising calcium carbonate molded body - Google Patents

Method for manufacturing neutralizer comprising calcium carbonate molded body Download PDF

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JP2020093222A
JP2020093222A JP2018233620A JP2018233620A JP2020093222A JP 2020093222 A JP2020093222 A JP 2020093222A JP 2018233620 A JP2018233620 A JP 2018233620A JP 2018233620 A JP2018233620 A JP 2018233620A JP 2020093222 A JP2020093222 A JP 2020093222A
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calcium carbonate
molded body
neutralizing agent
calcium hydroxide
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JP7178891B2 (en
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片桐　成人
Shigeto Katagiri
成人 片桐
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Rinnai Corp
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Abstract

To provide a method for manufacturing a neutralizer comprising a calcium carbonate molded body capable of continuously obtaining stable neutralization performance and easily manufacturing a molded body comprising calcium carbonate having a predetermined shape with good yield.SOLUTION: A manufacturing method includes a step of preparing a meadow soil of calcium hydroxide by mixing a calcium hydroxide powder, a binder and water, a step of obtaining a molded body comprising calcium hydroxide by extrusion molding the meadow soil, a step of obtaining a molded body comprising calcium hydroxide by carbonizing the molded body comprising calcium hydroxide and a step of obtaining a neutralizer comprising the calcium carbonate molded body by drying the molded body comprising calcium carbonate.SELECTED DRAWING: Figure 1

Description

本発明は、潜熱回収型熱交換器等で生じる酸性のドレン水の中和に用いられる中和剤の製造方法に関する。 The present invention relates to a method for producing a neutralizing agent used for neutralizing acidic drain water generated in a latent heat recovery type heat exchanger or the like.

潜熱回収型給湯器等の潜熱回収型熱交換器では、窒素酸化物（ＮＯｘ）やイオウ酸化物（ＳＯｘ）を含む燃料ガスを燃焼することによって酸性のドレン水が生じることが知られており、該酸性のドレン水を中和するために中和剤を用いることが知られている（例えば、特許文献１参照）。 In a latent heat recovery type heat exchanger such as a latent heat recovery type water heater, it is known that acidic drain water is generated by burning a fuel gas containing nitrogen oxides (NOx) and sulfur oxides (SOx), It is known to use a neutralizing agent to neutralize the acidic drain water (see, for example, Patent Document 1).

前記中和剤の製造方法として、例えば、粘土成分を含む炭酸カルシウムのスラリーをウレタンフォームに含浸させ、加熱して該スラリー中の粘土成分により炭酸カルシウムを固化すると共にウレタンフォームを分解除去して、炭酸カルシウム多孔質体からなる中和剤を得る方法が知られている（例えば、特許文献２参照）。 As a method for producing the neutralizing agent, for example, a urethane foam slurry is impregnated with a slurry of calcium carbonate containing a clay component, and the clay component in the slurry is heated to solidify the calcium carbonate and decompose and remove the urethane foam. A method of obtaining a neutralizing agent composed of a calcium carbonate porous body is known (see, for example, Patent Document 2).

特開２０１７−８７１５７号公報JP, 2017-87157, A 特開２０１１−２５１８８６号公報JP, 2011-251886, A

しかしながら、前記製造方法により得られる炭酸カルシウム多孔質体からなる中和剤は、炭酸カルシウムの固化のために中和に関与しない粘土成分を用いるため、継続的に安定した中和性能を得ることが難しいという不都合がある。 However, since the neutralizing agent composed of the calcium carbonate porous body obtained by the above-mentioned manufacturing method uses the clay component that does not participate in the neutralization for the solidification of calcium carbonate, it is possible to obtain a continuously stable neutralizing performance. It has the disadvantage of being difficult.

そこで、炭酸カルシウムのみからなる成形体を中和剤として用いることが望まれる。前記炭酸カルシウムのみからなる成形体の製造方法として、例えば、大理石、石灰岩等の炭酸カルシウムからなる石材から所定の形状の成形体を削り出すことが考えられるが、この場合には、歩留まりが悪い上に、欠け等の欠陥を生じやすく所定の形状の成形体を得ることが難しい。 Therefore, it is desired to use a molded product composed only of calcium carbonate as a neutralizing agent. As a method for producing a formed body composed of only calcium carbonate, for example, it is conceivable to carve out a formed body of a predetermined shape from a stone material made of calcium carbonate such as marble or limestone, but in this case, the yield is poor. In addition, defects such as chipping are likely to occur and it is difficult to obtain a molded product having a predetermined shape.

本発明は、かかる不都合を解消して、継続的に安定した中和性能を得ることができ、所定の形状を備える炭酸カルシウム成形体からなる中和剤を歩留まり良く容易に製造することができる中和剤の製造方法を提供することを目的とする。 INDUSTRIAL APPLICABILITY The present invention can eliminate such inconvenience, continuously obtain a stable neutralizing performance, and easily produce a neutralizing agent composed of a calcium carbonate molded product having a predetermined shape with high yield. It is an object of the present invention to provide a method for producing a solvate.

かかる目的を達成するために、本発明の中和剤の製造方法は、水酸化カルシウムの粉末と、バインダーと、水とを混合して、該バインダーを含む水酸化カルシウムの圷土を調製する工程と、該圷土を押出成形することにより、所定の形状の水酸化カルシウムからなる成形体を得る工程と、該水酸化カルシウムからなる成形体を二酸化炭素と接触させることにより水酸化カルシウムを炭酸化させ、炭酸カルシウムからなる成形体を得る工程と、該炭酸カルシウムからなる成形体を加熱して乾燥させることにより、炭酸カルシウム成形体からなる中和剤を得る工程とを備えることを特徴とする。 In order to achieve such an object, the method for producing a neutralizing agent of the present invention comprises a step of mixing calcium hydroxide powder, a binder, and water to prepare a calcium hydroxide dope containing the binder. And a step of obtaining a molded body made of calcium hydroxide in a predetermined shape by extruding the clay, and carbonizing the calcium hydroxide by bringing the molded body made of calcium hydroxide into contact with carbon dioxide. And a step of obtaining a molded product made of calcium carbonate, and a step of obtaining a neutralizing agent made of the calcium carbonate molded product by heating and drying the molded product made of calcium carbonate.

本発明の中和剤の製造方法では、まず、水酸化カルシウムの粉末と、バインダーと、水とを混合して、該バインダーを含む水酸化カルシウムの圷土を調製する。前記圷土は、前記バインダーを含むことにより、前記押出成形に適した硬度とすることができる。 In the method for producing a neutralizing agent of the present invention, first, a powder of calcium hydroxide, a binder, and water are mixed to prepare a calcium hydroxide dope containing the binder. By including the binder, the clay can have a hardness suitable for the extrusion molding.

本発明の中和剤の製造方法では、次に、前記圷土を押出成形する。このとき、前記圷土は前記バインダーを含み、前記押出成形に適した硬度となっているので、容易に所定の形状を備える水酸化カルシウムからなる成形体を得ることができる。 In the method for producing the neutralizing agent of the present invention, next, the clay is extruded. At this time, since the clay contains the binder and has a hardness suitable for the extrusion molding, it is possible to easily obtain a molded body made of calcium hydroxide having a predetermined shape.

本発明の中和剤の製造方法では、次に、前記水酸化カルシウムからなる成形体を二酸化炭素と接触させる。このようにすると、次式のように水酸化カルシウムが炭酸化され、炭酸カルシウムと水とが生成する。
Ｃａ（ＯＨ）２ ＋ ＣＯ２ → ＣａＣＯ３ ＋ Ｈ２Ｏ In the method for producing a neutralizing agent of the present invention, next, the molded body made of calcium hydroxide is brought into contact with carbon dioxide. By doing so, calcium hydroxide is carbonated as in the following formula, and calcium carbonate and water are produced.
Ca(OH) 2 + CO 2 → CaCO 3 + H 2 O

この結果、炭酸カルシウムからなる成形体を得ることができるが、該炭酸カルシウムからなる成形体は、前記水酸化カルシウムの炭酸化の際に生成する水を含んでいる。 As a result, a molded product made of calcium carbonate can be obtained, and the molded product made of calcium carbonate contains water generated during the carbonation of the calcium hydroxide.

そこで、本発明の中和剤の製造方法では、次に、前記炭酸カルシウムからなる成形体を加熱して乾燥させて水を除去することにより、炭酸カルシウム成形体からなる中和剤を得ることができる。 Therefore, in the method for producing a neutralizing agent of the present invention, next, a neutralizing agent comprising a calcium carbonate molded body can be obtained by heating and drying the molded body comprising calcium carbonate to remove water. it can.

本発明の中和剤の製造方法によれば、水酸化カルシウムの圷土を押出成形するので、所定の形状の水酸化カルシウムからなる成形体を歩留まり良く容易に製造することができる上、該水酸化カルシウムからなる成形体の水酸化カルシウムを炭酸化させることにより所定の形状の炭酸カルシウム成形体を容易に製造することができる。しかも、前記炭酸カルシウム成形体は実質的に炭酸カルシウムのみからなるので、中和剤としたときに酸性のドレン水に対して継続的に安定した中和性能を得ることができる。 According to the method for producing a neutralizing agent of the present invention, since the calcium hydroxide body is extrusion-molded, it is possible to easily produce a molded body of calcium hydroxide having a predetermined shape with good yield and A calcium carbonate molded body having a predetermined shape can be easily manufactured by carbonating calcium hydroxide of the molded body made of calcium oxide. Moreover, since the calcium carbonate molded body is essentially composed of calcium carbonate, it is possible to obtain continuously stable neutralization performance against acidic drain water when used as a neutralizing agent.

本発明の中和剤の製造方法において、前記水酸化カルシウムの圷土は、全量に対し０．５〜１質量％の範囲のバインダーと、全量に対し２０〜３０質量％の範囲の水とを含み、残部が水酸化カルシウムであることが好ましい。 In the method for producing a neutralizing agent of the present invention, the calcium hydroxide body contains a binder in a range of 0.5 to 1% by mass based on the total amount and water in a range of 20 to 30% by mass relative to the total amount. It is preferable to include and balance calcium hydroxide.

前記水酸化カルシウムの圷土は、前記組成を備えることにより、前記押出成形に適した硬度とすることができる。前記水酸化カルシウムの圷土において、前記バインダーの含有量が全量に対し０．５質量％未満であるときには、該圷土の硬度が小となり、前記押出成形の際に型崩れを生じ、所定の形状の前記水酸化カルシウムの成形体を得ることができないことがある。一方、前記水酸化カルシウムの圷土において、前記バインダーの含有量が全量に対し１．０質量％を超えるときには、得られた中和剤において、該バインダーが中和に関与しないので継続的に安定した中和性能を得ることができないことがある。 The calcium hydroxide clay having the above composition can have a hardness suitable for the extrusion molding. In the calcium hydroxide clay, when the content of the binder is less than 0.5% by mass based on the total amount, the hardness of the clay becomes small, causing a shape collapse during the extrusion molding, and It may not be possible to obtain a shaped body of the above calcium hydroxide. On the other hand, when the content of the binder exceeds 1.0% by mass based on the total amount in the calcium hydroxide dough, the binder does not participate in neutralization in the obtained neutralizing agent, so that the binder is continuously stable. The desired neutralization performance may not be obtained.

また、前記水酸化カルシウムの圷土において、前記水の含有量が全量に対し２０質量％未満であるときには該圷土の硬度が大となり、前記押出成形が困難になることがある。一方、前記水酸化カルシウムの圷土において、前記水の含有量が全量に対し３０質量％を超えるときには該圷土の硬度が小となり、前記押出成形の際に型崩れを生じ、所定の形状の前記水酸化カルシウムの成形体を得ることができないことがある。 Further, in the calcium hydroxide clay, when the content of the water is less than 20 mass% with respect to the total amount, the hardness of the clay becomes large and the extrusion molding may become difficult. On the other hand, in the calcium hydroxide clay, when the content of the water exceeds 30 mass% with respect to the total amount, the hardness of the clay becomes small, and the shape of the clay is collapsed during the extrusion molding, resulting in a predetermined shape. In some cases, it is not possible to obtain a molded product of the calcium hydroxide.

また、本発明の中和剤の製造方法において、前記押出成形は、４０℃以下の範囲の成形温度下、１３０〜１９０ｋｇ／ｃｍ２の範囲の成形圧力で行うことが好ましい。前記押出成形は、成形温度が４０℃を超えると、前記水酸化カルシウムの圷土中のバインダーに熱硬化劣化を生じ、所定の形状の前記水酸化カルシウムの成形体を得ることができないことがある。 In addition, in the method for producing a neutralizing agent of the present invention, the extrusion molding is preferably performed at a molding temperature in the range of 40° C. or lower and a molding pressure in the range of 130 to 190 kg/cm 2 . In the extrusion molding, when the molding temperature exceeds 40° C., the binder in the calcium hydroxide emulsified material may be deteriorated by thermosetting, and a molded body of the calcium hydroxide having a predetermined shape may not be obtained. .

また、前記押出成形において、成形圧力が１３０ｋｇ／ｃｍ２未満であるときには、該押出成形が困難になることがある。一方、成形圧力が１９０ｋｇ／ｃｍ２を超えるときには、金型や押出成形機に大きな負荷がかかり、設備寿命を縮めるおそれがある。
前記押出成形の際に型崩れを生じ、所定の形状の前記水酸化カルシウムの成形体を得ることができないことがある。 Further, in the extrusion molding, when the molding pressure is less than 130 kg/cm 2 , the extrusion molding may be difficult. On the other hand, when the molding pressure exceeds 190 kg/cm 2 , a large load is applied to the mold and the extruder, which may shorten the equipment life.
In some cases, the shape of the calcium hydroxide may be lost during the extrusion molding, and it may not be possible to obtain a molded body of the calcium hydroxide having a predetermined shape.

また、本発明の中和剤の製造方法において、前記バインダーとしては、例えば、カルボキシメチルセルロース（ＣＭＣ）を用いることができる。 Further, in the method for producing a neutralizing agent of the present invention, as the binder, for example, carboxymethyl cellulose (CMC) can be used.

また、本発明の中和剤の製造方法において、前記中和剤は、例えば、四角柱状の内部に断面四角形状の複数の貫通孔を備えるハニカム形状を備える中空筒状体とすることができる。 In addition, in the method for producing a neutralizing agent of the present invention, the neutralizing agent may be, for example, a hollow cylindrical body having a honeycomb shape having a plurality of through holes each having a quadrangular cross section inside a quadrangular prism.

本発明の中和剤の製造方法を示すフローチャート。The flowchart which shows the manufacturing method of the neutralizer of this invention. 本発明の中和剤の製造方法により得られる炭酸カルシウムの成形体の一例を示す斜視図。The perspective view which shows an example of the molded object of the calcium carbonate obtained by the manufacturing method of the neutralizer of this invention.

次に、添付の図面を参照しながら本発明の実施の形態についてさらに詳しく説明する。 Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

図１に示すように、本実施形態の中和剤の製造方法では、まず、ＳＴＥＰ１で原材料を調合し、次いでＳＴＥＰ２で、該原材料を湿式混合することにより、水酸化カルシウムの圷土を調製する。 As shown in FIG. 1, in the method for producing a neutralizing agent of the present embodiment, first, raw materials are prepared in STEP 1, and then in STEP 2, the raw materials are wet-mixed to prepare calcium hydroxide dough. ..

前記原材料の調合は、例えば、前記水酸化カルシウムの圷土の全量に対し０．５〜１質量％の範囲のバインダーと、全量に対し２０〜３０質量％の範囲の水と、残部が水酸化カルシウムの粉末となるよう行う。前記バインダーとしては、例えば、カルボキシメチルセルロース（ＣＭＣ）を用いることができる。また、前記水酸化カルシウムの粉末としては、例えば、工業用の消石灰（Ｃａ（ＯＨ）２）を用いることができる。 The raw materials are mixed by, for example, a binder in the range of 0.5 to 1% by mass with respect to the total amount of the calcium hydroxide body, water in the range of 20 to 30% by mass with respect to the total amount, and the balance being hydroxylated. Do so as to make calcium powder. As the binder, for example, carboxymethyl cellulose (CMC) can be used. As the calcium hydroxide powder, industrial slaked lime (Ca(OH) 2 ) can be used, for example.

また、前記原材料の湿式混合は、例えば、高速ミキサーを用いて行うことができる。この結果、全量に対し０．５〜１質量％の範囲のバインダーと、全量に対し２０〜３０質量％の範囲の水とを含み、残部が水酸化カルシウムである水酸化カルシウムの圷土を得ることができる。 The wet mixing of the raw materials can be performed using, for example, a high speed mixer. As a result, a calcium hydroxide body containing a binder in the range of 0.5 to 1% by mass with respect to the total amount and water in the range of 20 to 30% by mass with respect to the total amount and the balance being calcium hydroxide is obtained. be able to.

本実施形態の中和剤の製造方法では、次に、ＳＴＥＰ３で、前記水酸化カルシウムの圷土を図示しない混練押出機のシリンダーに供給し、例えば４０℃以下の成形温度下に、１３０〜１９０ｋｇ／ｃｍ２の範囲の成形圧力で、該シリンダーの先端に備えられた金型（ダイ）から押し出し成形する。このようにすると、水酸化カルシウムからなり所定の形状を備える成形体が長尺状に押し出される。 In the method for producing the neutralizing agent of the present embodiment, next, in STEP 3, the clay of calcium hydroxide is supplied to a cylinder of a kneading extruder (not shown), and for example, at a molding temperature of 40° C. or lower, 130 to 190 kg. Extrusion molding is performed from a mold (die) provided at the tip of the cylinder at a molding pressure in the range of /cm 2 . By doing so, a molded body made of calcium hydroxide and having a predetermined shape is extruded in a long shape.

そこで、次に、ＳＴＥＰ４で例えばピアノ線を用いて長尺状に押し出された前記水酸化カルシウムからなる成形体を所定の長さに切断することにより、所定の形状の水酸化カルシウムからなる成形体を得ることができる。前記切断は、金型（ダイ）から押し出された長尺状の成形体の長さ方向に対し、直交する方向にピアノ線を押圧することにより行うことができる。 Then, next, in STEP 4, the molded body made of calcium hydroxide extruded in a long shape using, for example, a piano wire is cut into a predetermined length to form a molded body made of calcium hydroxide in a predetermined shape. Can be obtained. The cutting can be performed by pressing a piano wire in a direction orthogonal to the length direction of the long shaped body extruded from the mold (die).

前記水酸化カルシウムからなる成形体は、中実柱状体、中実板状体であってもよく、図２に示す中空筒状体１であってもよい。図２に示す中空筒状体１は、四角柱状の内部に断面四角形状の複数の貫通孔２を備えるハニカム形状を備えている。 The molded body made of calcium hydroxide may be a solid columnar body, a solid plate body, or the hollow cylindrical body 1 shown in FIG. The hollow cylindrical body 1 shown in FIG. 2 has a honeycomb shape having a plurality of through holes 2 each having a quadrangular cross section inside a quadrangular prism.

図２に示す中空筒状体１は、例えば、前記押出成形において、断面がＬ字状、十字状、ト字状の各柱状体を成形し、前記金型を通過した直後に、各柱状体を相互に接着させることにより製造することができる。本実施形態では、前記バインダーを含む水酸化カルシウムの圷土を用い、前記成形温度及び前記成形圧力で前記押出成形を行うことにより、図２に示すニカム形状を備える中空筒状体１を容易に成形することができる。 The hollow cylindrical body 1 shown in FIG. 2 is, for example, in the above-mentioned extrusion molding, each columnar body having a L-shaped, cross-shaped, and G-shaped cross section is formed, and immediately after passing through the mold, each columnar body is formed. Can be manufactured by adhering them to each other. In the present embodiment, the hollow cylindrical body 1 having the Nicam shape shown in FIG. 2 is easily formed by performing the extrusion molding at the molding temperature and the molding pressure using the calcium hydroxide clay containing the binder. It can be molded.

本実施形態の中和剤の製造方法では、次に、ＳＴＥＰ５で、前記水酸化カルシウムからなる成形体の炭酸化を行う。前記炭酸化は、前記水酸化カルシウムからなる成形体を図示しない密閉された炉に収容し、該炉内に所定量の炭酸ガス（ＣＯ２）を充填して、１０〜６０℃、例えば４０℃の温度に、１〜４日間、例えば２日間以上保持することにより行う。この結果、次式のように水酸化カルシウム（Ｃａ（ＯＨ）２）が炭酸化され、炭酸カルシウム（ＣａＣＯ３）と水（Ｈ２Ｏ）とが生成する。
Ｃａ（ＯＨ）２ ＋ ＣＯ２ → ＣａＣＯ３ ＋ Ｈ２Ｏ In the method for producing the neutralizing agent of the present embodiment, next, in STEP 5, the formed body of calcium hydroxide is carbonated. For the carbonation, the molded body made of calcium hydroxide is housed in a closed furnace (not shown), and a predetermined amount of carbon dioxide gas (CO 2 ) is charged into the furnace, and the temperature is 10 to 60° C., for example, 40° C. The temperature is kept for 1 to 4 days, for example, 2 days or more. As a result, calcium hydroxide (Ca(OH) 2 ) is carbonated as in the following formula, and calcium carbonate (CaCO 3 ) and water (H 2 O) are produced.
Ca(OH) 2 + CO 2 → CaCO 3 + H 2 O

前記炭酸化は、例えば、水酸化カルシウム（Ｃａ（ＯＨ）２）が炭酸化されて炭酸カルシウム（ＣａＣＯ３）となることによるＸ線回折での水酸化カルシウムと炭酸カルシウムとの回折ピーク強度を測定することにより、その終点を判断することができる。この結果、炭酸カルシウムからなる成形体を得ることができるが、該炭酸カルシウムからなる成形体は前記炭酸化により生成した水を含んでいる。 For the carbonation, for example, the diffraction peak intensity of calcium hydroxide and calcium carbonate in X-ray diffraction is measured by calcium carbonate (Ca(OH) 2 ) being carbonized to form calcium carbonate (CaCO 3 ). By doing so, the end point can be determined. As a result, a molded product made of calcium carbonate can be obtained, but the molded product made of calcium carbonate contains water produced by the carbonation.

そこで、本実施形態の中和剤の製造方法では、次に、ＳＴＥＰ６で、前記炭酸カルシウムからなる成形体の乾燥を行う。前記乾燥は、前記炭酸カルシウムからなる成形体を、図示しない熱風乾燥機に収容し、例えば、５０〜８０℃の熱風流通下に４〜１２時間保持することにより行うことができ、この結果、ＳＴＥＰ７で、炭酸カルシウム成形体からなる中和剤（成形品）を得ることができる。 Therefore, in the method for producing the neutralizing agent of the present embodiment, next, in STEP 6, the formed body of calcium carbonate is dried. The drying can be carried out by accommodating the formed body made of the calcium carbonate in a hot air drier (not shown) and keeping it in the hot air flow at 50 to 80° C. for 4 to 12 hours. As a result, STEP7 Thus, a neutralizing agent (molded product) composed of a calcium carbonate molded product can be obtained.

１…中空筒状体、 ２…貫通孔。 1... Hollow cylindrical body, 2... Through hole.

Claims (5)

水酸化カルシウムの粉末と、バインダーと、水とを混合して、該バインダーを含む水酸化カルシウムの圷土を調製する工程と、
該圷土を押出成形することにより、所定の形状の水酸化カルシウムからなる成形体を得る工程と、
該水酸化カルシウムからなる成形体を二酸化炭素と接触させることにより水酸化カルシウムを炭酸化させ、炭酸カルシウムからなる成形体を得る工程と、
該炭酸カルシウムからなる成形体を加熱して乾燥させることにより、炭酸カルシウム成形体からなる中和剤を得る工程とを備えることを特徴とする炭酸カルシウム成形体からなる中和剤の製造方法。 A step of mixing calcium hydroxide powder, a binder, and water to prepare a calcium hydroxide clay containing the binder;
A step of obtaining a molded body made of calcium hydroxide in a predetermined shape by extrusion molding the clay,
A step of carbonizing the calcium hydroxide by contacting the formed body made of calcium hydroxide with carbon dioxide to obtain a formed body made of calcium carbonate;
And a step of obtaining a neutralizing agent composed of the calcium carbonate molded body by heating and drying the molded body composed of the calcium carbonate, the method for producing a neutralizing agent composed of the calcium carbonate molded body. 請求項１記載の炭酸カルシウム成形体からなる中和剤の製造方法において、前記水酸化カルシウムの圷土は、全量に対し０．５〜１質量％の範囲のバインダーと、全量に対し２０〜３０質量％の範囲の水とを含み、残部が水酸化カルシウムの粉末であることを特徴とする炭酸カルシウム成形体からなる中和剤の製造方法。 The method for producing a neutralizing agent comprising a molded calcium carbonate body according to claim 1, wherein the calcium hydroxide body is in a range of 0.5 to 1% by mass with respect to the total amount, and 20 to 30 with respect to the total amount. A method for producing a neutralizing agent comprising a calcium carbonate molded body, which comprises water in the range of mass% and the balance being powder of calcium hydroxide. 請求項１又は請求項２記載の炭酸カルシウム成形体からなる中和剤の製造方法において、前記押出成形は、４０℃以下の範囲の成形温度下、１３０〜１９０ｋｇ／ｃｍ２の範囲の成形圧力で行うことを特徴とする炭酸カルシウム成形体からなる中和剤の製造方法。 The method for producing a neutralizing agent comprising the calcium carbonate molded body according to claim 1 or 2, wherein the extrusion molding is performed at a molding temperature in the range of 40°C or less and a molding pressure in the range of 130 to 190 kg/cm 2. A method for producing a neutralizing agent comprising a calcium carbonate molded body, which is characterized by being carried out. 請求項１乃至請求項３のいずれか１項記載の炭酸カルシウム成形体からなる中和剤の製造方法において、前記バインダーはカルボキシメチルセルロースであることを特徴とする炭酸カルシウム成形体からなる中和剤の製造方法。 The method for producing a neutralizing agent comprising a calcium carbonate molded body according to any one of claims 1 to 3, wherein the binder is carboxymethyl cellulose. Production method. 請求項１乃至請求項４のいずれか１項記載の炭酸カルシウム成形体からなる中和剤の製造方法において、前記中和剤は、四角柱状の内部に断面四角形状の複数の貫通孔を備えるハニカム形状を備える中空筒状体であることを特徴とする炭酸カルシウム成形体からなる中和剤の製造方法。 The method for producing a neutralizing agent comprising the calcium carbonate molded body according to any one of claims 1 to 4, wherein the neutralizing agent has a honeycomb shape having a plurality of through holes each having a rectangular cross section inside a quadrangular prism shape. A method for producing a neutralizing agent comprising a calcium carbonate molded body, which is a hollow cylindrical body having a shape.
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