JP2005281120A - Method for manufacturing calcium silicate having low bulk density - Google Patents
Method for manufacturing calcium silicate having low bulk density Download PDFInfo
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- JP2005281120A JP2005281120A JP2004127418A JP2004127418A JP2005281120A JP 2005281120 A JP2005281120 A JP 2005281120A JP 2004127418 A JP2004127418 A JP 2004127418A JP 2004127418 A JP2004127418 A JP 2004127418A JP 2005281120 A JP2005281120 A JP 2005281120A
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Abstract
Description
本発明は等モルの二酸化硅素と水酸化カルシウムの蒸熱処理による珪酸カルシウムの合成に際し該反応系に水と共にメタンガスを介在させて反応を進行させることを特徴とする嵩比重の低い珪酸カルシウムの製造方法に関する。
本発明はまた、無機性の珪酸カルシウム系保冷材、保温材、断熱材および、軽量骨材を提供するものである。The present invention relates to a method for producing calcium silicate having a low bulk specific gravity, characterized in that in the synthesis of calcium silicate by steaming heat treatment of equimolar silicon dioxide and calcium hydroxide, the reaction is allowed to proceed with methane gas together with water in the reaction system. About.
The present invention also provides an inorganic calcium silicate cold insulating material, a heat insulating material, a heat insulating material, and a lightweight aggregate.
珪酸カルシウムは熱伝導率が小さく、容易にその原料から成形体を作ることができるので保温材や断熱材料として広く使用されている。そして珪酸カルシウム保温材は珪藻土のような無定形珪酸を主体とする原料と適量の石綿及び消石灰を混合して蒸熱処理し、トバモライト、ゾノライト等の結晶を成長させ成型品として製造されている。このように珪藻土やシリカゲル等の無定形珪酸では反応が進むが石英、珪石、珪砂のような定形珪酸では反応が進まないのでこれらが珪藻土中に混入していると成型品が不均質となり嵩比重も大きくなり障害となる。 Calcium silicate has a low thermal conductivity and can easily be formed from the raw material, so it is widely used as a heat insulating material and a heat insulating material. The calcium silicate heat insulating material is produced as a molded product by mixing a raw material mainly composed of amorphous silicic acid such as diatomaceous earth with appropriate amounts of asbestos and slaked lime and growing crystals such as tobermorite and zonorite. In this way, the reaction proceeds with amorphous silicic acid such as diatomaceous earth and silica gel, but the reaction does not proceed with regular silicic acid such as quartz, quarzite, and silica sand. Will also become an obstacle.
また、上記珪藻土と消石灰等から製造された珪酸カルシウム保温材の嵩比重は一般にトバモライト系保温材は０．２０ｇ／ｃｍ３、ゾノライト系保温材は０．２３ｇ／ｃｍ３程度である。その点、石英等の定形珪酸も、珪藻土等の不定形珪酸と同様に蒸熱処理で珪酸カルシウムを生成することが望まれ、その際、従来品より嵩比重が低くなることが望まれるところである。例えば他材質ではあるがフォームグラス保冷剤の嵩比重は０．１３〜０．１６ｇ／ｃｍ３であり、これと同程度の嵩比重の低い珪酸カルシウムが廉価に製造することができれば珪酸カルシウム系保冷剤、保温材、断熱材、さらに軽量骨材として新規な用途が開けるものと思われる。The bulk density of the calcium silicate insulation material produced from the diatomaceous earth and slaked lime, etc. are generally tobermorite system thermal insulation material is 0.20 g / cm 3, the zonolite based heat insulating material is about 0.23 g / cm 3. In this regard, it is desired that the regular silicic acid such as quartz also produces calcium silicate by steaming as in the case of the irregular silicic acid such as diatomaceous earth, and at that time, the bulk specific gravity is desired to be lower than that of the conventional product. For example, although the bulk specific gravity of the foam glass cooling agent is 0.13 to 0.16 g / cm 3 although it is another material, if calcium silicate having a low bulk specific gravity can be produced at low cost, the calcium silicate type cold insulation It seems that new applications can be opened as an agent, a heat insulating material, a heat insulating material, and a lightweight aggregate.
珪藻土、シリカゲル等の無定形珪酸と水酸化カルシウムの蒸熱処理で珪酸カルシウムの成形体は生成するが石英、珪石、珪砂等の定形二酸化硅素を用いて同様な、そして更に、嵩比重の低い珪酸カルシウムの生成の可能性について鋭意検討がなされた。本発明は前記のような問題点を解決し従来のものより嵩比重の低い珪酸カルシウムの保冷材、保温材、断熱材或いは軽量骨材を提供することを目的とする。 Calcium silicate compacts are produced by steaming heat treatment of amorphous silicic acid such as diatomaceous earth and silica gel and calcium hydroxide, but the same and lower bulk specific gravity calcium silicate using regular silicon dioxide such as quartz, silica and silica sand. The study of the possibility of the generation of was carried out. An object of the present invention is to solve the above-mentioned problems and to provide a calcium silicate cold insulating material, a heat insulating material, a heat insulating material or a lightweight aggregate having a lower bulk specific gravity than the conventional one.
本発明は等モルの二酸化硅素と水酸化カルシウムの蒸熱処理による珪酸カルシウムの合成に際し該反応系にメタンガスを介在させることを特徴とする嵩比重の低い珪酸カルシウムの製造方法である。 The present invention is a method for producing calcium silicate having a low bulk density, characterized in that methane gas is interposed in the reaction system in the synthesis of calcium silicate by steaming heat treatment of equimolar silicon dioxide and calcium hydroxide.
メタンガスを介在させた蒸熱処理の反応系の二酸化硅素はコロイド状になり比較的よく水に溶けるのが観察される。このことは公知の技術であり、特開平１０−２１７２０８、に示すところである。このメタンガスの作用はつまびらかではないがメタンガスに浸透作用があり、この浸透作用により二酸化硅素が水中に分散されコロイド溶液になるものと思われる。メタンガスの浸透作用は強く、本発明の如くメタンガスを介在させてソーダガラス片を蒸熱処理すると該ガラス片から二酸化硅素が溶出するのがみられる。コロイド溶液に溶解している二酸化硅素の存在は紫外線照射による蛍光の発色で判定できる。かくして、コロイド溶液中の微小な二酸化硅素が、溶解している水酸化カルシウムと等モル化合して均質な嵩比重の低い珪酸カルシウムを生成するものと思われる。 It is observed that the silicon dioxide in the reaction system of steaming treatment with methane gas is colloidal and dissolves in water relatively well. This is a known technique and is disclosed in JP-A-10-217208. The action of methane gas is not trivial, but methane gas has an osmotic action, and this osmotic action seems to disperse silicon dioxide in water to form a colloidal solution. The penetration action of methane gas is strong, and when a soda glass piece is steamed with methane gas interposed as in the present invention, silicon dioxide is eluted from the glass piece. The presence of silicon dioxide dissolved in the colloidal solution can be determined by the color development of fluorescence by ultraviolet irradiation. Thus, it appears that the fine silicon dioxide in the colloidal solution is equimolarly combined with the dissolved calcium hydroxide to produce homogeneous calcium silicate with low bulk specific gravity.
この詳細は後記、実施例１に示すがこれは本発明の特徴であるメタンガスを介在させた蒸熱処理により石英のような定形珪酸と水酸化カルシウムの反応が進み嵩比重の低い珪酸カルシウムを生成する。
また、後記実施例２に不定形珪酸であるシリカゲルと水酸化カルシウムの、メタンガスを介在させた蒸熱処理で嵩比重の低い珪酸カルシウムが生成することを示している。これに先立って、メタンガスを添加しないで行った従来法のシリカゲルと水酸化カルシウムの蒸熱処理ではダイカルシウムシリケート等の水硬性物質やゾノライト等が生成し均質な生成物は得られないものであった。The details will be described later in Example 1. This is a heat treatment with methane gas, which is a feature of the present invention, and the reaction between the regular silicic acid such as quartz and calcium hydroxide proceeds to produce calcium silicate having a low bulk specific gravity. .
Further, Example 2 below shows that calcium silicate having a low bulk specific gravity is produced by steaming of silica gel and calcium hydroxide, which are amorphous silicic acid, with methane gas interposed. Prior to this, the conventional heat treatment of silica gel and calcium hydroxide without adding methane gas produced hydraulic substances such as dicalcium silicate, zonolite, etc., and homogeneous products could not be obtained. .
かくして実施例１及び実施例２で生成された嵩比重の低い珪酸カルシウムは二酸化硅素と水酸化カルシウムの溶融により生成する珪酸カルシウムと同型のものであるが嵩比重が極めて低いものであった。この成因もメタンガスの浸透作用によるものと思われる。 Thus, the calcium silicate having a low bulk specific gravity produced in Example 1 and Example 2 was the same type as the calcium silicate produced by melting silicon dioxide and calcium hydroxide, but the bulk specific gravity was extremely low. This cause is also thought to be due to the penetration of methane gas.
以上の結果から本発明に使用される二酸化硅素は石英、珪石、珪砂、珪藻土、シリカゲル又はこれらの混合物であり反応に預かる量は各成分中のＳｉＯ２の合計量である。その他、ガラス片、ポルトランドセメント片等の二酸化硅素を含有する物質には本発明の適用が可能である。
本発明に使用される水酸化カルシウムは生石灰が水と充分接触し反応が完結した消石灰である。From the above results, silicon dioxide used in the present invention is quartz, quartzite, quartz sand, diatomaceous earth, silica gel, or a mixture thereof, and the amount left for the reaction is the total amount of SiO 2 in each component. In addition, the present invention can be applied to substances containing silicon dioxide such as glass pieces and Portland cement pieces.
The calcium hydroxide used in the present invention is slaked lime in which quick lime is in sufficient contact with water and the reaction is complete.
本発明に使用される二酸化硅素と水酸化カルシウムの比率は、１：１の等モル量であるが実用上二酸化硅素１モルに対して水酸化カルシウム０．９５〜１．０５モルである。この範囲の製品が均質な嵩比重の低い珪酸カルシウムとなる。 The ratio of silicon dioxide and calcium hydroxide used in the present invention is an equimolar amount of 1: 1, but is practically 0.95 to 1.05 moles of calcium hydroxide per mole of silicon dioxide. Products in this range are homogeneous calcium silicates with low bulk specific gravity.
本発明の嵩比重の低い珪酸カルシウムの製造方法における蒸熱処理では水蒸気とメタンガスを確保するためオートクレーブを用いた高温、高圧の反応となる。 The steam heat treatment in the method for producing calcium silicate having a low bulk specific gravity according to the present invention is a high-temperature and high-pressure reaction using an autoclave to secure water vapor and methane gas.
オートクレーブに最初に収容する反応物の量は最終の生成物が水中によく分散されるよう制限する。水量はオートクレーブ内容積の１０％以上、二酸化硅素と水酸化カルシウムの合計量は水量の５０％以下の量とする。上部空間部にメタンガスを常温で１Ｍｐａ以上の圧力に封入し２００℃以上に加熱する。
次に実施例を示すがこれは本発明を限定するものではない。The amount of reactant initially contained in the autoclave is limited so that the final product is well dispersed in water. The amount of water is 10% or more of the internal volume of the autoclave, and the total amount of silicon dioxide and calcium hydroxide is 50% or less of the amount of water. Methane gas is sealed in the upper space at a pressure of 1 Mpa or higher at room temperature and heated to 200 ° C. or higher.
The following examples illustrate but do not limit the invention.
内容積５００ｃｍ３のオートクレーブに水２５０ｃｍ３、二酸化硅素（試薬）１２ｇ及び水酸化カルシウム（試薬）１５ｇを収容しメタンガスを５ＭＰａ（ゲージ圧）封入し、３７０℃まで加熱した。オートクレーブを冷却、ガス解放後内容物を濾過、乾燥させて微粉末状の反応生成物を得た。この粉末の嵩比重は０．１４２ｇ／ｃｍ３であった。An autoclave with an internal volume of 500 cm 3 contained 250 cm 3 of water, 12 g of silicon dioxide (reagent) and 15 g of calcium hydroxide (reagent), sealed with 5 MPa (gauge pressure) of methane gas, and heated to 370 ° C. After cooling the autoclave and releasing the gas, the contents were filtered and dried to obtain a fine powdery reaction product. The bulk specific gravity of this powder was 0.142 g / cm 3 .
内容積５００ｃｍ３のオートクレーブに水２５０ｃｍ３、よく乾燥したシリカゲル（試薬）１２ｇ及び水酸化カルシウム（試薬）１５ｇを収容しメタンガスを５ＭＰａ（ゲージ圧）封入し、３７０℃まで加熱した。オートクレーブを冷却、ガス解放後内容物を濾過、乾燥させて微粉末状の反応生成物を得た。この粉末の嵩比重は０．１４０ｇ／ｃｍ３であった。An autoclave with an internal volume of 500 cm 3 was filled with 250 cm 3 of water, 12 g of well-dried silica gel (reagent) and 15 g of calcium hydroxide (reagent), filled with 5 MPa (gauge pressure) of methane gas, and heated to 370 ° C. After cooling the autoclave and releasing the gas, the contents were filtered and dried to obtain a fine powdery reaction product. The bulk specific gravity of this powder was 0.140 g / cm 3 .
以上のとおり、本発明の嵩比重の低い珪酸カルシウムは原料が珪藻土、シリカゲル等の不定形珪酸から石英、珪石、珪砂、等の定形珪酸まで幅広く用いることができ生成物も均質な粉末であることから保温材の現地施工が容易になり嵩比重は従来品よりかなり低くなり保温材のほか、保冷剤、断熱材或いは軽量骨材にも用いられ用途がかなり広まりその効果は頗る大きい。 As described above, calcium silicate having a low bulk specific gravity according to the present invention can be used widely from amorphous silicic acid such as diatomaceous earth and silica gel to regular silicic acid such as quartz, quartzite and silica sand, and the product is also a homogeneous powder. Therefore, the construction of the heat insulating material becomes easy and the bulk specific gravity is considerably lower than that of the conventional product. In addition to the heat insulating material, it can be used for a cold insulating material, a heat insulating material, or a lightweight aggregate, and the effect is greatly increased.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116375442A (en) * | 2023-03-02 | 2023-07-04 | 武汉理工大学 | High-strength calcium silicate board containing white calcium zeolite and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116375442A (en) * | 2023-03-02 | 2023-07-04 | 武汉理工大学 | High-strength calcium silicate board containing white calcium zeolite and preparation method thereof |
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