JP5380494B2 - Method for producing calcined gypsum and gypsum board - Google Patents
Method for producing calcined gypsum and gypsum board Download PDFInfo
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Description
本発明は、原料石膏を焼成して焼石膏を製造する方法、およびその焼石膏を使用する石膏ボードの製造方法に関する。 The present invention relates to a method for producing a calcined gypsum by firing raw material gypsum, and a method for producing a gypsum board using the calcined gypsum.
焼石膏は、化学石膏、天然石膏などの原料石膏をそれぞれ単独または混合して、焼成し、主に二水石膏（ＣａＳＯ４・２Ｈ２Ｏ）である原料石膏を、主に半水石膏（ＣａＳＯ４・１／２Ｈ２Ｏ）に転移させて製造される。二水石膏及び半水石膏の化学式に基づく化合水（結晶水）の含有量の理論値はそれぞれ２０．９ｗｔ％及び６．２ｗｔ％である。なお原料石膏は化合水以外の自由水（付着水）を含んでいるのが普通である。 For calcined gypsum, raw gypsum such as chemical gypsum and natural gypsum are singly or mixed and calcined, and raw gypsum that is mainly dihydrate gypsum (CaSO 4 · 2H 2 O) is mainly hydrated gypsum (CaSO gypsum). (4 · 1 / 2H 2 O). The theoretical values of the combined water (crystal water) content based on the chemical formulas of dihydrate gypsum and hemihydrate gypsum are 20.9 wt% and 6.2 wt%, respectively. The raw material gypsum usually contains free water (adhesion water) other than compound water.
上記で得られた焼石膏は、適量の水を加えて泥漿にすると二水和物となって速やかに固化するので、さまざまな石膏製品の原料として好適に使用されるが、例えば石膏ボード製造用原料として使用される。 The calcined gypsum obtained above can be used as a raw material for various gypsum products because it forms a dihydrate when it is made into a slurry by adding an appropriate amount of water, and is used suitably as a raw material for various gypsum products. Used as a raw material.
石膏ボードは、二水石膏を主体とする芯を石膏ボード用原紙で被覆してなる板状体であり、製造に際し、焼石膏、接着助剤、硬化促進剤、軽量化を図るための泡、その他の添加剤等、更には、混和材及び水とを混練し、この結果得られた焼石膏スラリーを上下の石膏ボード用原紙の間に流し込み、板状に成形し、しかる後、硬化後に粗切断し、強制乾燥後に製品寸法に切断される。 Gypsum board is a plate-like body formed by coating a core mainly composed of dihydrate gypsum with base paper for gypsum board. During production, calcined gypsum, adhesion aid, curing accelerator, foam for weight reduction, Other additives, etc., and further admixture and water are kneaded, and the calcined gypsum slurry obtained as a result is poured between upper and lower gypsum board base paper, formed into a plate shape, and then roughened after curing. After cutting and forced drying, it is cut into product dimensions.
上記のように製造された石膏ボードは、防耐火性、遮音性、施工性及び経済性等から建築用内装材として広く使用されている。近年、産業廃棄物の減容化の社会的要請から、新築時及び解体時の廃石膏ボードの石膏ボードメーカーへのリサイクル率が増すに伴い、リサイクル石膏の石膏ボード用原料石膏への配合比率も向上している。しかし、リサイクル率の向上に伴い、主にリサイクル石膏の石膏結晶が微細であることに起因して、焼石膏スラリーに適度な流動性を持たせるための焼石膏の混水量が増大し、石膏ボードの乾燥工程において乾燥させなければならない余剰水が増大するため必要な乾燥エネルギーが増大し、石膏ボードの生産性が大幅に低下するという問題点がある。 The gypsum board manufactured as described above is widely used as an interior material for buildings because of fire resistance, sound insulation, workability and economy. In recent years, due to the social demand for volume reduction of industrial waste, as the rate of recycling gypsum board waste at the time of new construction and dismantling to gypsum board manufacturers has increased, the ratio of recycled gypsum to gypsum board raw material gypsum has also increased. It has improved. However, with the improvement of the recycling rate, mainly due to the fact that the gypsum crystals of recycled gypsum are fine, the amount of mixed water of calcined gypsum to give the calcined gypsum slurry proper fluidity increases, and the gypsum board In this drying process, excess water that must be dried increases, so that the necessary drying energy increases, and the productivity of gypsum board is greatly reduced.
石膏ボードを製造するために使用される焼石膏の混水量低減のための先行技術として次のようなものがある。 There are the following as prior arts for reducing the amount of mixed water of calcined gypsum used for manufacturing a gypsum board.
例えば、特公平３−５１６６５号公報（特許文献１）において、焼石膏原料をブレンダーに運ぶ工程と、焼石膏原料に、重量比で該原料の約１％乃至約１０％の範囲で、水を混合せしめて、少量の自由水により焼石膏粒子表面を短時間、粒子が必要以上に微細化され水溶することを防ぐ如きヒール処理する工程と、前記のヒール処理を施した焼石膏を高温で乾燥する工程と、乾燥し、ヒール処理した焼石膏を、石膏粒子の表面積を増加させるために粉砕し、それによってその表面が石膏ボード内の強度増加の割合を高め、かつ最終強度を高めるために水と反応させる工程とを含有してなることを特徴とし、加水処理しない焼石膏に比べ、約２０％の混水量が低減できる焼石膏の製造方法が開示されている。 For example, in Japanese Patent Publication No. 3-51665 (Patent Document 1), water is added to the blended gypsum raw material to the blender and the calcined gypsum raw material in a weight ratio of about 1% to about 10% of the raw material. Mixing and drying the surface of calcined gypsum particles with a small amount of free water for a short time to prevent the particles from becoming unnecessarily fine and water soluble, and drying the calcined gypsum subjected to the above heel treatment at high temperature Pulverizing the dried and heeled calcined gypsum to increase the surface area of the gypsum particles, thereby increasing the rate of strength increase in the gypsum board and increasing the final strength of the gypsum particles. And a method of producing calcined gypsum that can reduce the amount of mixed water by about 20% compared to calcined gypsum that is not hydrotreated.
ここに開示されたこの先行技術は図１に示された処理工程を有するものであるが、この方法は、乾燥工程において、ヒール処理した焼石膏の残存自由水を蒸発させることは示してあるが、焼石膏の化合的に結合した水をも除去することがないように選定する必要があると記載されている。しかしこの方法では、焼石膏の混水量が低減でき必要な乾燥エネルギーは削減できるものの、凝結時間が遅延するために石膏ボードの製造速度を低下させなければならない、又は、石膏ボードの製造速度を低下させないためには、大多量の凝結促進剤を用いなければならず石膏ボードの諸物性が低下するという問題点があった。 Although this prior art disclosed herein has the processing steps shown in FIG. 1, this method is shown to evaporate the remaining free water of the heeled calcined gypsum in the drying step. In addition, it is described that it is necessary to select so that the combined water of calcined gypsum is not removed. However, this method can reduce the amount of mixed water of calcined gypsum and reduce the required drying energy, but the setting time of gypsum board has to be reduced because the setting time is delayed, or the production speed of gypsum board is reduced. In order to prevent this, a large amount of setting accelerator must be used, and there is a problem that various physical properties of the gypsum board are lowered.
本発明は、原料石膏を焼成し、加水処理をして焼石膏の混水量を低減させても凝結時間が遅延しない焼石膏の製造方法を提供することを目的とする。 An object of the present invention is to provide a method for producing calcined gypsum that does not delay the setting time even if raw material gypsum is calcined and hydrotreated to reduce the mixed water amount of calcined gypsum.
本発明の他の目的は、上記の製造方法によって得られた焼石膏を一部または全部利用して石膏ボードを製造する方法を提供することである。 Another object of the present invention is to provide a method for producing a gypsum board using part or all of the calcined gypsum obtained by the above production method.
本発明者らは、鋭意検討を行った結果、原料石膏を焼成（１次焼成）し得られた焼石膏に加水処理を施し、再焼成（２次焼成）することにより、混水量が少なく凝結時間が遅延しない焼石膏が得られることを見出し本発明に至った。 As a result of intensive studies, the inventors of the present invention applied water treatment to the calcined gypsum obtained by calcining the raw gypsum (primary calcining) and re-calcining (secondary calcining), thereby reducing the amount of mixed water. The inventors have found that calcined gypsum that does not delay time can be obtained, and have reached the present invention.
すなわち、請求項１に記載の発明による焼石膏の製造方法は、原料石膏を焼成し焼石膏を得る１次焼成工程と、得られた焼石膏の一部または全量を１０〜５０℃に冷却する冷却工程と、冷却した焼石膏に加水処理を施す加水処理工程と、加水処理して得られた焼石膏を、さらに再焼成する２次焼成工程とからなることを特徴とする。 That is, in the method for producing calcined gypsum according to the first aspect of the present invention, a primary calcining step of calcining raw gypsum to obtain calcined gypsum, and a part or all of the obtained calcined gypsum is cooled to 10 to 50 ° C. It is characterized by comprising a cooling step, a water treatment step for subjecting the cooled calcined gypsum to a water treatment, and a secondary calcining step in which the calcined gypsum obtained by the water treatment is further refired.
本発明と図１に示す前記先行技術との差異は、加水処理して得られた焼石膏を更に再焼成する点にあり、先行技術においては、加水処理した焼石膏を、化合水を蒸発させない範囲で加熱するものに対し、本発明では、化合水を蒸発させるように焼成する点で相違している。 The difference between the present invention and the prior art shown in FIG. 1 is that the calcined gypsum obtained by hydrotreating is further refired. In the prior art, the hydrolyzed gypsum does not evaporate the combined water. In contrast to what is heated in the range, the present invention is different in that it is fired so as to evaporate the combined water.
請求項２に記載の発明による焼石膏の製造方法は、上記請求項１記載の焼石膏の製造方法において、原料石膏は、リサイクル石膏を含むことを特徴とする。 A method for producing calcined gypsum according to a second aspect of the present invention is the method for producing calcined gypsum according to the first aspect, wherein the raw material gypsum includes recycled gypsum.
請求項３に記載の発明による焼石膏の製造方法は、上記請求項１または２記載の焼石膏の製造方法において、リサイクル石膏の割合が原料石膏の２〜５０ｗｔ％であることを特徴とする。 The method for producing calcined gypsum according to the invention described in claim 3 is characterized in that, in the method for producing calcined gypsum according to claim 1 or 2, the ratio of recycled gypsum is 2 to 50 wt% of the raw gypsum.
請求項４に記載の発明による焼石膏の製造方法は、上記請求項１〜３記載の焼石膏の製造方法において、加水処理工程において、焼石膏に加水処理を施す水量が、焼石膏あたり１〜１０ｗｔ％であることを特徴とする。 The method for producing calcined gypsum according to the invention described in claim 4 is the method for producing calcined gypsum according to any one of claims 1 to 3, wherein in the hydrating process, the amount of water for hydrotreating the calcined gypsum is 1 to 1 per gypsum. It is characterized by 10 wt%.
請求項５に記載の発明による焼石膏の製造方法は、上記請求項１〜４記載の焼石膏の製造方法において、２次焼成工程において、加水処理された焼石膏の化合水を３〜７ｗｔ％にすることを特徴とする。 The method for producing calcined gypsum according to the invention described in claim 5 is the method for producing calcined gypsum according to claims 1 to 4, wherein the combined water of the calcined gypsum hydrotreated in the secondary firing step is 3 to 7 wt%. It is characterized by.
請求項６に記載の発明による焼石膏の製造方法は、上記請求項１〜５記載の焼石膏の製造方法において、１次焼成工程と２次焼成工程における焼成手段は、同じ焼成装置を利用することを特徴とする。 The method for producing calcined gypsum according to the invention described in claim 6 is the method for producing calcined gypsum according to any one of claims 1 to 5, wherein the firing means in the primary firing step and the secondary firing step use the same firing apparatus. It is characterized by that.
請求項７に記載の発明による焼石膏の製造方法は、上記請求項１〜６記載の方法により得た焼石膏を一部または全量使用することを特徴とする。 The method for producing calcined gypsum according to the invention described in claim 7 is characterized in that a part or all of the calcined gypsum obtained by the method described in claims 1 to 6 is used.
本発明によれば、原料石膏を焼成し、加水処理をして焼石膏を再焼成させると、混水量が少なくかつ凝結時間が遅延しない焼石膏を製造することができる。また、混水量の増大を招くリサイクル石膏を石膏原料として多量に使用しても、上記のように製造された焼石膏は混水量が少なくかつ凝結時間が遅延しないので、石膏ボードの生産性を低減させることなく、通常の石膏ボードを製造することができる。 According to the present invention, calcined gypsum can be produced by calcining raw material gypsum, hydrotreating it, and recalculating the calcined gypsum, which has a small amount of mixed water and does not delay the setting time. Moreover, even if a large amount of recycled gypsum that causes an increase in the amount of mixed water is used as a raw material for gypsum, calcined gypsum manufactured as described above has a small amount of mixed water and does not delay the setting time, thus reducing the productivity of gypsum board A normal gypsum board can be produced without causing it.
以下、本発明の実施の形態を説明する。 Embodiments of the present invention will be described below.
本発明の焼石膏は、原料石膏を１次焼成して得られた焼石膏の全量またはその一部を加水処理して、２次焼成して製造される。 The calcined gypsum of the present invention is produced by subjecting the entire amount or a part of the calcined gypsum obtained by primary firing of the raw material gypsum to secondary firing.
本発明の原料石膏としては、天然石膏または中和石膏もしくは副産石膏などの化学石膏を単独で、あるいはそれらの二種以上を混合したものが使用できる。主な化学石膏としてはリン酸石膏、フッ酸石膏、チタン石膏または排煙脱硫石膏などが例示される。 As the raw material gypsum of the present invention, natural gypsum, chemical gypsum such as neutralized gypsum or by-product gypsum, or a mixture of two or more types thereof can be used. Examples of main chemical gypsum include phosphate gypsum, hydrofluoric acid gypsum, titanium gypsum, and flue gas desulfurization gypsum.
原料石膏（天然石膏または化学石膏）はそれぞれ１〜２５ｗｔ％の付着水を含んでいる。 The raw gypsum (natural gypsum or chemical gypsum) contains 1 to 25 wt% of adhering water.
また、本発明の原料石膏には、リサイクル石膏を含んでもよい。 The raw gypsum of the present invention may include recycled gypsum.
リサイクル石膏は、石膏ボードメーカーで自家発生する廃石膏ボード、新築時及び解体時に発生する廃石膏ボード等から回収されるリサイクル石膏であればいずれでも良い。 The recycled gypsum may be any recycled gypsum that is recovered from waste gypsum board generated by a gypsum board manufacturer, waste gypsum board generated at the time of new construction or dismantling, and the like.
リサイクル石膏の通常の原料石膏への配合比率は、２〜５０ｗｔ％の範囲、より好ましくは１０〜３０ｗｔ％の範囲である。リサイクル率が少なければ回収されるリサイクル石膏を消化できず、リサイクル率が多すぎるとリサイクル石膏の石膏結晶が微細であることに起因して、石膏ボードの生産性が大幅に低下するので好ましくない。 The mixing ratio of the recycled gypsum to the normal raw material gypsum is in the range of 2 to 50 wt%, more preferably in the range of 10 to 30 wt%. If the recycle rate is low, the collected recycle gypsum cannot be digested, and if the recycle rate is too high, the gypsum crystal of the recycle gypsum is fine and the productivity of the gypsum board is greatly reduced.
１次焼成工程において、当業者で用いられているケトル、ロータリーキルン等の焼成装置を用いて、常法で原料石膏を焼成して焼石膏を得る。使用される焼成装置は、特に限定されるものではない。焼成完了時（焼き上がり）の焼石膏の品温は１３０〜１８０℃が好ましく、更に好ましくは、速やかに加水処理できる１３０〜１５５℃である。得られる焼石膏の品温が１３０℃〜１５５℃の場合、加水処理時に焼石膏を強制的に冷却しなくても（加水処理時の焼石膏の品温は１００℃〜１３０℃）、焼石膏は混水量の低減効果を発揮するが、加水処理時の焼石膏の品温を室温程度（約１０〜５０℃）にすると、焼石膏の混水量はさらに低減する。得られる焼石膏の品温が１５５〜１８０℃の場合、加水処理の際に、焼石膏は、混水量の低減効果を発揮させるために、ドラムクーラーなどの冷却装置を用いて室温程度（約１０〜５０℃）に冷却する必要がある。 加水処理工程において、１次焼成後の焼石膏に、１〜１０ｗｔ％の水を加え、分散攪拌して、加水処理された焼石膏を得る。混合攪拌装置としては、分散攪拌できれば何でも良い。加水水量が１０ｗｔ％よりも多ければ二水石膏が析出し、１ｗｔ％よりも少なければ混水量低減効果がほとんど得られないので好ましくない。加水水量は２〜５ｗｔ％がより好ましい。 In the primary firing step, the raw gypsum is fired by a conventional method using a kettle, a rotary kiln or the like used by those skilled in the art to obtain calcined gypsum. The baking apparatus used is not particularly limited. The product temperature of the calcined gypsum upon completion of firing (baked) is preferably 130 to 180 ° C., more preferably 130 to 155 ° C., which allows rapid water treatment. When the product temperature of the calcined gypsum obtained is 130 ° C. to 155 ° C., the calcined gypsum is not forcedly cooled during the water treatment (the product temperature of the calcined gypsum during the water treatment is 100 ° C. to 130 ° C.). Exhibits an effect of reducing the amount of mixed water. However, when the product temperature of the calcined gypsum during the hydration treatment is about room temperature (about 10 to 50 ° C.), the amount of mixed water of the calcined gypsum is further reduced. In the case where the product temperature of the obtained calcined gypsum is 155 to 180 ° C., the calcined gypsum uses a cooling device such as a drum cooler in order to exert the effect of reducing the amount of mixed water during the hydration treatment. To 50 ° C.). In the hydration treatment step, 1 to 10 wt% of water is added to the calcined gypsum after the primary firing, and dispersed and stirred to obtain a hydrotreated calcined gypsum. Any mixing and stirring device may be used as long as it can disperse and stir. If the amount of water is more than 10 wt%, dihydrate gypsum precipitates, and if it is less than 1 wt%, the effect of reducing the amount of mixed water is hardly obtained. The amount of water added is more preferably 2 to 5 wt%.
加水処理工程において、１次焼成後の焼石膏を、原料石膏と混合し、原料石膏に含まれる付着水を利用して、加水処理された焼石膏を得てもよい。この場合、１次焼成で得られた焼石膏と原料石膏を混合する方法は、特に限定するものではないが、例えば、焼石膏をスクリューコンベア等の輸送手段を用い、循環させて、原料石膏に混合させてもよいし、１次焼成後の焼石膏に、ベルトコンベア等の輸送手段を用いて原料石膏を新たに混合してもよい。また、焼石膏と原料石膏とを混合する手段は既設の設備を利用すれば、新たな設備投資のコストがかからず好ましい。加水処理のために原料石膏に付着している水を利用するので、付着水以外の水は加える必要がなく、加水処理のための新たな設備を取付ける必要もないのでコストを大幅に削減できる。 In the hydration treatment step, the calcined gypsum after the primary firing may be mixed with the raw gypsum, and the hydrotreated calcined gypsum may be obtained using the adhering water contained in the raw gypsum. In this case, the method of mixing the calcined gypsum obtained by the primary firing and the raw gypsum is not particularly limited. For example, the calcined gypsum is circulated using a transport means such as a screw conveyor to form the raw gypsum. You may make it mix and raw material gypsum may be newly mixed with calcined gypsum after primary baking using transport means, such as a belt conveyor. In addition, it is preferable to use existing equipment as a means for mixing calcined gypsum and raw material gypsum because it does not require new equipment investment costs. Since the water adhering to the raw material gypsum is used for the hydrating treatment, it is not necessary to add water other than the adhering water, and it is not necessary to install new equipment for the hydrating treatment, so the cost can be greatly reduced.
加水処理工程において、１次焼成後の焼石膏を、原料石膏と混合し、原料石膏に含まれる付着水を利用して、加水処理された焼石膏を得る場合、焼石膏の割合は、原料石膏に対し５〜１５０ｗｔ％が好ましい。上記の割合で原料石膏と焼石膏を混合すると、既存の設備のみで焼石膏の加水処理ができ、加水処理された焼石膏を２次焼成することにより、混水量の低減した、凝結時間の遅延しない焼石膏が得られる。 In the hydration process, the calcined gypsum after the primary firing is mixed with the raw material gypsum, and the hydrotreated calcined gypsum is obtained using the adhering water contained in the raw material gypsum. 5 to 150 wt% is preferable. When raw gypsum and calcined gypsum are mixed in the above ratio, calcined gypsum can be hydrotreated only with existing equipment, and the amount of mixed water is reduced by secondary calcining of the hydrotreated calcined gypsum, delaying the setting time No calcined gypsum is obtained.
２次焼成工程（再焼成）において、当業者で用いられているケトル、ロータリーキルン等の焼成装置を用いて、常法で加水処理された焼石膏を焼成して焼石膏を得る。得られた焼石膏の化合水は３〜７ｗｔ％が好ましく、より好ましくは、焼石膏の凝結が促進される傾向にある３〜５ｗｔ％である。化合水が、７ｗｔ％より多くなれば、未焼成の二水石膏が残存し、焼石膏の凝結時間や焼石膏スラリーの流動性に悪影響を及ぼすので好ましくない。２次焼成で使用される焼成装置は、１次焼成で使用されたものと同じものを使用すれば、新たに焼成装置を設置する必要がなくコストを大幅に削減できて好ましいが、特に同じものを使用することに限定するものでもない。 In the secondary firing step (re-firing), the calcined gypsum hydrotreated by a conventional method is calcined using a calcining apparatus such as a kettle or a rotary kiln used by those skilled in the art to obtain calcined gypsum. The combined water of the obtained calcined gypsum is preferably 3 to 7 wt%, and more preferably 3 to 5 wt% which tends to promote the setting of calcined gypsum. If the combined water is more than 7 wt%, unfired dihydrate gypsum remains, which adversely affects the setting time of the calcined gypsum and the fluidity of the calcined gypsum slurry. It is preferable to use the same firing device used in the secondary firing as the one used in the primary firing because it is not necessary to install a new firing device and the cost can be greatly reduced. It is not limited to using.
本発明では、１次焼成処理工程、加水処理工程、及び２次焼成処理工程に、さらにチューブミルなどの粉砕装置を用い焼石膏を粉砕する粉砕処理工程を含んでも良い。 In the present invention, the primary firing treatment step, the hydration treatment step, and the secondary firing treatment step may further include a grinding treatment step of grinding the calcined gypsum using a grinding device such as a tube mill.
粉砕処理工程は、加水処理工程の前後、または２次焼成の後で行われるが、好ましくは、２次焼成工程後に行われる。 The pulverization treatment step is performed before or after the hydration treatment step or after the secondary calcination, but preferably is performed after the secondary calcination step.
こうして得られる焼石膏は、接着助剤、硬化促進剤及び軽量化を図るための泡、その他の添加剤等、更には、混和材及び水とを混練し、この結果得られた焼石膏スラリー（以下、泥漿という）を上下の原紙の間に流し込み、上下に配した成型ロールの間や上下のプレートの間を通して板状に成形し、しかる後、搬送ベルト上で硬化させ、粗切断し、強制乾燥後に製品寸法に切断して生産される通常の石膏ボード製造の原料等として有効に利用できる。 The calcined gypsum thus obtained is kneaded with an adhesion aid, a curing accelerator, foam for weight reduction, other additives and the like, and further an admixture and water. (Hereinafter referred to as “sludge”) is poured between upper and lower base papers, formed into a plate shape between upper and lower forming rolls and between upper and lower plates, and then cured on a conveyor belt, roughly cut, and forced It can be effectively used as a raw material for the production of normal gypsum board produced by cutting into product dimensions after drying.
原料石膏としては、天然石膏４０ｗｔ％、および排煙脱硫石膏６０ｗｔ％の混合品の１００メッシュパス９０ｗｔ％のもの、天然石膏３５ｗｔ％、排煙脱硫石膏５５ｗｔ％、およびリサイクル石膏１０ｗｔ％の混合品の１００メッシュパス９０ｗｔ％のもの、天然石膏３０ｗｔ％、排煙脱硫石膏５０ｗｔ％、およびリサイクル石膏２０ｗｔの混合品の１００メッシュパス９０ｗｔ％のもの、および天然石膏２５ｗｔ％、排煙脱硫石膏４５ｗｔ％、およびリサイクル石膏３０ｗｔ％の混合品の１００メッシュパス９０ｗｔ％のものの４種類を用いた。
［実施例１］
処理工程を図３に示す。
The raw material gypsum is a mixture of natural gypsum 40 wt% and flue gas desulfurization gypsum 60 wt% 100 mesh pass 90 wt%, natural gypsum 35 wt%, flue gas desulfurization gypsum 55 wt%, and recycled gypsum 10 wt%. 100 mesh pass 90 wt%, natural gypsum 30 wt%, flue gas desulfurization gypsum 50 wt%, and recycled gypsum 20 wt mixture 100 mesh pass 90 wt%, and natural gypsum 25 wt%, flue gas desulfurization gypsum 45 wt%, and Four types of a mixed product of 30 wt% recycled gypsum having a 100 mesh pass and 90 wt% were used.
[Example 1]
The processing steps are shown in FIG.
原料石膏３ｋｇを小型ケトルに仕込み、焼き上がり品温を１６５℃として１次焼成を行い、焼石膏を得た。１次焼成後の焼石膏から約１．０ｇ採取して化合水（化合水Ａ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏を密閉容器に入れ２４時間放置した後、焼石膏を密閉容器から取り出して、小型ポットミルを用いて粉砕し、焼石膏のブレーン 比表面積を約７０００cm2／gに調整した。これらの焼石膏は品温を測定した後、密閉容器に入れ焼石膏当たり３ｗｔ％の水を加え、直ちに１分間激しく攪拌することにより加水処理を行った。加水処理後の焼石膏から約１．０ｇ採取して化合水（化合水Ｂ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏は再び小型ケトルに仕込み、焼き上がり品温１６５℃として２次焼成を行った。得られた焼石膏を室温に放冷後、小型ポットミルを用いて粉砕しブレーン 比表面積を約８０００cm2／gに調整してサンプルの焼石膏を得た。
［参考例１］
処理工程を図３に示す。
3 kg of raw material gypsum was charged into a small kettle, and the final baking was performed at a baked product temperature of 165 ° C. to obtain calcined gypsum. About 1.0 g was collected from the calcined gypsum after the primary firing, and the combined water (compound water A) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was placed in a sealed container and allowed to stand for 24 hours, and then the calcined gypsum was taken out of the sealed container and pulverized using a small pot mill, and the bran specific surface area of the calcined gypsum was adjusted to about 7000 cm 2 / g. These calcined gypsums were measured for product temperature, then placed in a sealed container, added with 3 wt% water per calcined gypsum, and immediately subjected to hydration by vigorously stirring for 1 minute. About 1.0 g was collected from the calcined gypsum after the hydrolysis treatment, and the combined water (compound water B) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was again charged into a small kettle and subjected to secondary firing at a baked product temperature of 165 ° C. The obtained calcined gypsum was allowed to cool to room temperature and then pulverized using a small pot mill to adjust the brain specific surface area to about 8000 cm 2 / g to obtain a calcined gypsum sample.
[ Reference Example 1 ]
The processing steps are shown in FIG.
原料石膏３ｋｇを小型ケトルに仕込み、焼き上がり品温を１５０℃として１次焼成を行い、焼石膏を得た。１次焼成後の焼石膏から約１．０ｇ採取して化合水（化合水Ａ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏を直ちに、小型ポットミルを用いて粉砕し、焼石膏のブレーン 比表面積を約７０００cm2／gに調整した。これらの焼石膏は品温を測定した後、密閉容器に入れ焼石膏当たり３ｗｔ％の水を加え、直ちに１分間激しく攪拌することにより加水処理を行った。加水処理後の焼石膏から約１．０ｇ採取して化合水（化合水Ｂ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏は再び小型ケトルに仕込み、焼き上がり品温１６５℃として２次焼成を行った。得られた焼石膏を室温に放冷後、小型ポットミルを用いて粉砕しブレーン 比表面積を約８０００cm2／gに調整してサンプルの焼石膏を得た。
［実施例２］
処理工程を図３に示す。
3 kg of raw material gypsum was charged into a small kettle, and the final baking was performed at a baked product temperature of 150 ° C. to obtain calcined gypsum. About 1.0 g was collected from the calcined gypsum after the primary firing, and the combined water (compound water A) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was immediately pulverized using a small pot mill, and the bran specific surface area of the calcined gypsum was adjusted to about 7000 cm 2 / g. These calcined gypsums were measured for product temperature, then placed in a sealed container, added with 3 wt% water per calcined gypsum, and immediately subjected to hydration by vigorously stirring for 1 minute. About 1.0 g was collected from the calcined gypsum after the hydrolysis treatment, and the combined water (compound water B) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was again charged into a small kettle and subjected to secondary firing at a baked product temperature of 165 ° C. The obtained calcined gypsum was allowed to cool to room temperature and then pulverized using a small pot mill to adjust the brain specific surface area to about 8000 cm 2 / g to obtain a calcined gypsum sample.
[Example 2 ]
The processing steps are shown in FIG.
原料石膏３ｋｇを小型ケトルに仕込み、焼き上がり品温を１５０℃として１次焼成を行い、焼石膏を得た。１次焼成後の焼石膏から約１．０ｇ採取して化合水（化合水Ａ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏を密閉容器に入れ２４時間放置した後、焼石膏を密閉容器から取り出して、小型ポットミルを用いて粉砕し、焼石膏のブレーン 比表面積を約７０００cm2／gに調整した。これらの焼石膏は品温を測定した後、密閉容器に入れ焼石膏当たり３ｗｔ％の水を加え、直ちに１分間激しく攪拌することにより加水処理を行った。加水処理後の焼石膏から約１．０ｇ採取して化合水（化合水Ｂ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏は再び小型ケトルに仕込み、焼き上がり品温１６５℃として２次焼成を行った。得られた焼石膏を室温に放冷後、小型ポットミルを用いて粉砕しブレーン 比表面積を約８０００cm2／gに調整してサンプルの焼石膏を得た。
［実施例３］
処理工程を図３に示す。
3 kg of raw material gypsum was charged into a small kettle, and the final baking was performed at a baked product temperature of 150 ° C. to obtain calcined gypsum. About 1.0 g was collected from the calcined gypsum after the primary firing, and the combined water (compound water A) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was placed in a sealed container and allowed to stand for 24 hours, and then the calcined gypsum was taken out of the sealed container and pulverized using a small pot mill, and the bran specific surface area of the calcined gypsum was adjusted to about 7000 cm 2 / g. These calcined gypsums were measured for product temperature, then placed in a sealed container, added with 3 wt% water per calcined gypsum, and immediately subjected to hydration by vigorously stirring for 1 minute. About 1.0 g was collected from the calcined gypsum after the hydrolysis treatment, and the combined water (compound water B) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was again charged into a small kettle and subjected to secondary firing at a baked product temperature of 165 ° C. The obtained calcined gypsum was allowed to cool to room temperature and then pulverized using a small pot mill to adjust the brain specific surface area to about 8000 cm 2 / g to obtain a calcined gypsum sample.
[Example 3 ]
The processing steps are shown in FIG.
原料石膏３ｋｇを小型ケトルに仕込み、焼き上がり品温を１６５℃として１次焼成を行い、焼石膏を得た。１次焼成後の焼石膏から約１．０ｇ採取して化合水（化合水Ａ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏を密閉容器に入れ２４時間放置した後、焼石膏を密閉容器から取り出して、小型ポットミルを用いて粉砕し、焼石膏のブレーン 比表面積を約７０００cm2／gに調整した。これらの焼石膏は品温を測定した後、密閉容器に入れ焼石膏当たり３ｗｔ％の水を加え、直ちに１分間激しく攪拌することにより加水処理を行った。加水処理後の焼石膏から約１．０ｇ採取して化合水（化合水Ｂ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏は再び小型ケトルに仕込み、焼き上がり品温１７５℃として２次焼成を行った。得られた焼石膏を室温に放冷後、小型ポットミルを用いて粉砕しブレーン 比表面積を約８０００cm2／gに調整してサンプルの焼石膏を得た。
［参考例２］
処理工程を図３に示す。
3 kg of raw material gypsum was charged into a small kettle, and the final baking was performed at a baked product temperature of 165 ° C. to obtain calcined gypsum. About 1.0 g was collected from the calcined gypsum after the primary firing, and the combined water (compound water A) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was placed in a sealed container and allowed to stand for 24 hours, and then the calcined gypsum was taken out of the sealed container and pulverized using a small pot mill, and the bran specific surface area of the calcined gypsum was adjusted to about 7000 cm 2 / g. These calcined gypsums were measured for product temperature, then placed in a sealed container, added with 3 wt% water per calcined gypsum, and immediately subjected to hydration by vigorously stirring for 1 minute. About 1.0 g was collected from the calcined gypsum after the hydrolysis treatment, and the combined water (compound water B) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was again charged into a small kettle and subjected to secondary firing at a baked product temperature of 175 ° C. The obtained calcined gypsum was allowed to cool to room temperature and then pulverized using a small pot mill to adjust the brain specific surface area to about 8000 cm 2 / g to obtain a calcined gypsum sample.
[ Reference Example 2 ]
The processing steps are shown in FIG.
原料石膏３ｋｇを小型ケトルに仕込み、焼き上がり品温を１５０℃として１次焼成を行い、焼石膏を得た。１次焼成後の焼石膏から約１．０ｇ採取して化合水（化合水Ａ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏を直ちに、小型ポットミルを用いて粉砕し、焼石膏のブレーン 比表面積を約７０００cm2／gに調整した。これらの焼石膏は品温を測定した後、密閉容器に入れ焼石膏当たり３ｗｔ％の水を加え、直ちに１分間激しく攪拌することにより加水処理を行った。加水処理後の焼石膏から約１．０ｇ採取して化合水（化合水Ｂ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏は再び小型ケトルに仕込み、焼き上がり品温１７５℃として２次焼成を行った。得られた焼石膏を室温に放冷後、小型ポットミルを用いて粉砕しブレーン 比表面積を約８０００cm2／gに調整してサンプルの焼石膏を得た。
［実施例４］
処理工程を図３に示す。
3 kg of raw material gypsum was charged into a small kettle, and the final baking was performed at a baked product temperature of 150 ° C. to obtain calcined gypsum. About 1.0 g was collected from the calcined gypsum after the primary firing, and the combined water (compound water A) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was immediately pulverized using a small pot mill, and the bran specific surface area of the calcined gypsum was adjusted to about 7000 cm 2 / g. These calcined gypsums were measured for product temperature, then placed in a sealed container, added with 3 wt% water per calcined gypsum, and immediately subjected to hydration by vigorously stirring for 1 minute. About 1.0 g was collected from the calcined gypsum after the hydrolysis treatment, and the combined water (compound water B) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was again charged into a small kettle and subjected to secondary firing at a baked product temperature of 175 ° C. The obtained calcined gypsum was allowed to cool to room temperature and then pulverized using a small pot mill to adjust the brain specific surface area to about 8000 cm 2 / g to obtain a calcined gypsum sample.
[Example 4 ]
The processing steps are shown in FIG.
原料石膏３ｋｇを小型ケトルに仕込み、焼き上がり品温を１５０℃として１次焼成を行い、焼石膏を得た。１次焼成後の焼石膏から約１．０ｇ採取して化合水（化合水Ａ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏を密閉容器に入れ２４時間放置した後、焼石膏を密閉容器から取り出して、小型ポットミルを用いて粉砕し、焼石膏のブレーン 比表面積を約７０００cm2／gに調整した。これらの焼石膏は品温を測定した後、密閉容器に入れ焼石膏当たり３ｗｔ％の水を加え、直ちに１分間激しく攪拌することにより加水処理を行った。加水処理後の焼石膏から約１．０ｇ採取して化合水（化合水Ｂ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏は再び小型ケトルに仕込み、焼き上がり品温１７５℃として２次焼成を行った。得られた焼石膏を室温に放冷後、小型ポットミルを用いて粉砕しブレーン 比表面積を約８０００cm2／gに調整してサンプルの焼石膏を得た。
［実施例５］
処理工程を図４に示す。
3 kg of raw material gypsum was charged into a small kettle, and the final baking was performed at a baked product temperature of 150 ° C. to obtain calcined gypsum. About 1.0 g was collected from the calcined gypsum after the primary firing, and the combined water (compound water A) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was placed in a sealed container and allowed to stand for 24 hours, and then the calcined gypsum was taken out of the sealed container and pulverized using a small pot mill, and the bran specific surface area of the calcined gypsum was adjusted to about 7000 cm 2 / g. These calcined gypsums were measured for product temperature, then placed in a sealed container, added with 3 wt% water per calcined gypsum, and immediately subjected to hydration by vigorously stirring for 1 minute. About 1.0 g was collected from the calcined gypsum after the hydrolysis treatment, and the combined water (compound water B) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was again charged into a small kettle and subjected to secondary firing at a baked product temperature of 175 ° C. The obtained calcined gypsum was allowed to cool to room temperature and then pulverized using a small pot mill to adjust the brain specific surface area to about 8000 cm 2 / g to obtain a calcined gypsum sample.
[Example 5 ]
The processing steps are shown in FIG.
原料石膏３ｋｇを小型ケトルに仕込み、焼き上がり品温を１６５℃として１次焼成を行い、焼石膏を得た。１次焼成後の焼石膏から約１．０ｇ採取して化合水（化合水Ａ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏を密閉容器に入れ２４時間放置した後、焼石膏を密閉容器から取り出して、小型ポットミルを用いて粉砕し、焼石膏のブレーン 比表面積を約７０００cm2／gに調整した。得られた焼石膏の５０ｗｔ％は加水処理後２次焼成し、残りの５０ｗｔ％の焼石膏（１次焼成のみの焼石膏）はそのままにした。加水処理後２次焼成する焼石膏は品温測定後、密閉容器に入れ焼石膏当たり３ｗｔ％の水を加え、直ちに１分間激しく攪拌することにより加水処理を行った。加水処理後の焼石膏から０．５ｇと１次焼成のみの焼石膏から０．５ｇを採取して混合し化合水（化合水Ｂ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。加水処理後の焼石膏の残りは、再び小型ケトルに仕込み、焼き上がり品温１６５℃として２次焼成を行った。得られた焼石膏を室温に放冷後、上記で得られた１次焼成のみの焼石膏の残りと併せて小型ポットミルを用いて粉砕し、ブレーン 比表面積を約８０００cm2／gに調整してサンプルの焼石膏を得た。
［参考例３］
処理工程を図４に示す。
3 kg of raw material gypsum was charged into a small kettle, and the final baking was performed at a baked product temperature of 165 ° C. to obtain calcined gypsum. About 1.0 g was collected from the calcined gypsum after the primary firing, and the combined water (compound water A) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was placed in a sealed container and allowed to stand for 24 hours, and then the calcined gypsum was taken out of the sealed container and pulverized using a small pot mill, and the bran specific surface area of the calcined gypsum was adjusted to about 7000 cm 2 / g. 50 wt% of the obtained calcined gypsum was subjected to secondary firing after the water treatment, and the remaining 50 wt% calcined gypsum (calcined gypsum only for primary firing) was left as it was. The calcined gypsum to be secondarily fired after the water treatment was placed in an airtight container, added with 3 wt% water per calcined gypsum, and immediately stirred vigorously for 1 minute for water treatment. 0.5 g from the calcined gypsum after the hydrolysis treatment and 0.5 g from the calcined gypsum only subjected to the primary firing were mixed and mixed water (compound water B) was measured by a test method according to JIS R 9101. The remainder of the calcined gypsum after the hydration treatment was again charged into a small kettle and subjected to secondary firing at a baked product temperature of 165 ° C. The obtained calcined gypsum is allowed to cool to room temperature, and then pulverized using a small pot mill together with the rest of the calcined gypsum obtained only above, and the brain specific surface area is adjusted to about 8000 cm 2 / g. A sample calcined gypsum was obtained.
[ Reference Example 3 ]
The processing steps are shown in FIG.
原料石膏３ｋｇを小型ケトルに仕込み、焼き上がり品温を１４０℃として１次焼成を行い、焼石膏を得た。１次焼成後の焼石膏から約１．０ｇ採取して化合水（化合水Ａ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏を直ちに、小型ポットミルを用いて粉砕し、焼石膏のブレーン 比表面積を約７０００cm2／gに調整した。得られた焼石膏の５０ｗｔ％は加水処理後２次焼成し、残りの５０ｗｔ％の焼石膏（１次焼成のみの焼石膏）はそのままにした。加水処理後２次焼成する焼石膏は品温測定後、密閉容器に入れ焼石膏当たり３ｗｔ％の水を加え、直ちに１分間激しく攪拌することにより加水処理を行った。加水処理後の焼石膏から０．５ｇと１次焼成のみの焼石膏から０．５ｇを採取して混合し化合水（化合水Ｂ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。加水処理後の焼石膏の残りは、再び小型ケトルに仕込み、焼き上がり品温１６５℃として２次焼成を行った。得られた焼石膏を室温に放冷後、上記で得られた１次焼成のみの焼石膏の残りと併せて小型ポットミルを用いて粉砕し、ブレーン 比表面積を約８０００cm2／gに調整してサンプルの焼石膏を得た。
［実施例６］
処理工程を図４に示す。
3 kg of raw material gypsum was charged into a small kettle, and the final baking was performed at a baked product temperature of 140 ° C. to obtain calcined gypsum. About 1.0 g was collected from the calcined gypsum after the primary firing, and the combined water (compound water A) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was immediately pulverized using a small pot mill, and the bran specific surface area of the calcined gypsum was adjusted to about 7000 cm 2 / g. 50 wt% of the obtained calcined gypsum was subjected to secondary firing after the water treatment, and the remaining 50 wt% calcined gypsum (calcined gypsum only for primary firing) was left as it was. The calcined gypsum to be secondarily fired after the water treatment was placed in an airtight container, added with 3 wt% water per calcined gypsum, and immediately stirred vigorously for 1 minute for water treatment. 0.5 g from the calcined gypsum after the hydrolysis treatment and 0.5 g from the calcined gypsum only subjected to the primary firing were mixed and mixed water (compound water B) was measured by a test method according to JIS R 9101. The remainder of the calcined gypsum after the hydration treatment was again charged into a small kettle and subjected to secondary firing at a baked product temperature of 165 ° C. The obtained calcined gypsum is allowed to cool to room temperature, and then pulverized using a small pot mill together with the rest of the calcined gypsum obtained only above, and the brain specific surface area is adjusted to about 8000 cm 2 / g. A sample calcined gypsum was obtained.
[Example 6 ]
The processing steps are shown in FIG.
原料石膏３ｋｇを小型ケトルに仕込み、焼き上がり品温を１４０℃として１次焼成を行い、焼石膏を得た。１次焼成後の焼石膏から約１．０ｇ採取して化合水（化合水Ａ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏を密閉容器に入れ２４時間放置した後、焼石膏を密閉容器から取り出して、小型ポットミルを用いて粉砕し、焼石膏のブレーン 比表面積を約７０００cm2／gに調整した。得られた焼石膏の５０ｗｔ％は加水処理後２次焼成し、残りの５０ｗｔ％の焼石膏（１次焼成のみの焼石膏）はそのままにした。加水処理後２次焼成する焼石膏は品温を測定後、密閉容器に入れ焼石膏当たり３ｗｔ％の水を加え、直ちに１分間激しく攪拌することにより加水処理を行った。加水処理後の焼石膏から０．５ｇと１次焼成のみの焼石膏から０．５ｇを採取して混合し化合水（化合水Ｂ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。加水処理後の焼石膏の残りは、再び小型ケトルに仕込み、焼き上がり品温１６５℃として２次焼成を行った。得られた焼石膏を室温に放冷後、上記で得られた１次焼成のみの焼石膏の残りと併せて小型ポットミルを用いて粉砕し、ブレーン 比表面積を約８０００cm2／gに調整してサンプルの焼石膏を得た。
［実施例７］
処理工程を図５に示す。
3 kg of raw material gypsum was charged into a small kettle, and the final baking was performed at a baked product temperature of 140 ° C. to obtain calcined gypsum. About 1.0 g was collected from the calcined gypsum after the primary firing, and the combined water (compound water A) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was placed in a sealed container and allowed to stand for 24 hours, and then the calcined gypsum was taken out of the sealed container and pulverized using a small pot mill, and the bran specific surface area of the calcined gypsum was adjusted to about 7000 cm 2 / g. 50 wt% of the obtained calcined gypsum was subjected to secondary firing after the water treatment, and the remaining 50 wt% calcined gypsum (calcined gypsum only for primary firing) was left as it was. The calcined gypsum to be secondarily fired after the hydration treatment was subjected to the hydration treatment by placing it in a sealed container, adding 3 wt% water per calcined gypsum, and immediately stirring vigorously for 1 minute. 0.5 g from the calcined gypsum after the hydrolysis treatment and 0.5 g from the calcined gypsum only subjected to the primary firing were mixed and mixed water (compound water B) was measured by a test method according to JIS R 9101. The remainder of the calcined gypsum after the hydration treatment was again charged into a small kettle and subjected to secondary firing at a baked product temperature of 165 ° C. The obtained calcined gypsum is allowed to cool to room temperature, and then pulverized using a small pot mill together with the rest of the calcined gypsum obtained only above, and the brain specific surface area is adjusted to about 8000 cm 2 / g. A sample calcined gypsum was obtained.
[Example 7 ]
The processing steps are shown in FIG.
原料石膏１．５ｋｇを小型ケトルに仕込み、焼き上がり品温を１６５℃として１次焼成を行い、焼石膏を得た。１次焼成後の焼石膏から約１．０ｇ採取して化合水（化合水Ａ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏を密閉容器に入れ２４時間放置した後、焼石膏を密閉容器から取り出し、焼石膏の品温を測定後、新たな原料石膏１．５ｋｇを混合した。なお、ここでその混合物から１．０ｇを採取して化合水（化合水Ｂ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの混合物は小型ケトルに仕込み、焼き上がり品温１６５℃として２次焼成を行った。得られた焼石膏を室温に放冷後、小型ポットミルを用いて粉砕しブレーン 比表面積を約８０００cm2／gに調整してサンプルの焼石膏を得た。
［参考例４］
処理工程を図５に示す。
Raw material gypsum (1.5 kg) was charged into a small kettle, and the final baking was performed at a baked product temperature of 165 ° C. to obtain calcined gypsum. About 1.0 g was collected from the calcined gypsum after the primary firing, and the combined water (compound water A) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was placed in an airtight container and allowed to stand for 24 hours, and then the calcined gypsum was taken out from the airtight container, the product temperature of the calcined gypsum was measured, and 1.5 kg of new raw material gypsum was mixed. In addition, 1.0g was extract | collected from the mixture here, and the compound water (compound water B) was measured with the test method by JISR9101. The remaining mixture was charged into a small kettle and subjected to secondary firing at a baked product temperature of 165 ° C. The obtained calcined gypsum was allowed to cool to room temperature and then pulverized using a small pot mill to adjust the brain specific surface area to about 8000 cm 2 / g to obtain a calcined gypsum sample.
[ Reference Example 4 ]
The processing steps are shown in FIG.
原料石膏１．５ｋｇを小型ケトルに仕込み、焼き上がり品温を１４０℃として１次焼成を行い、焼石膏を得た。１次焼成後の焼石膏から約１．０ｇ採取して化合水（化合水Ａ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏は品温を測定後直ちに、新たな原料石膏１．５ｋｇと混合した。なお、ここでその混合物から１．０ｇを採取して化合水（化合水Ｂ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの混合物は小型ケトルに仕込み、焼き上がり品温１６５℃として２次焼成を行った。得られた焼石膏を室温に放冷後、小型ポットミルを用いて粉砕しブレーン 比表面積を約８０００cm2／gに調整してサンプルの焼石膏を得た。
［実施例８］
処理工程を図５に示す。
Raw material gypsum (1.5 kg) was charged into a small kettle and subjected to primary firing at a baked product temperature of 140 ° C. to obtain calcined gypsum. About 1.0 g was collected from the calcined gypsum after the primary firing, and the combined water (compound water A) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was mixed with 1.5 kg of fresh raw gypsum immediately after measuring the product temperature. In addition, 1.0g was extract | collected from the mixture here, and the compound water (compound water B) was measured with the test method by JISR9101. The remaining mixture was charged into a small kettle and subjected to secondary firing at a baked product temperature of 165 ° C. The obtained calcined gypsum was allowed to cool to room temperature and then pulverized using a small pot mill to adjust the brain specific surface area to about 8000 cm 2 / g to obtain a calcined gypsum sample.
[Example 8 ]
The processing steps are shown in FIG.
原料石膏１．５ｋｇを小型ケトルに仕込み、焼き上がり品温を１４０℃として１次焼成を行い、焼石膏を得た。１次焼成後の焼石膏から約１．０ｇ採取して化合水（化合水Ａ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏を密閉容器に入れ２４時間放置した後、焼石膏を密閉容器から取り出し、焼石膏の品温を測定後、新たな原料石膏１．５ｋｇと混合した。なお、ここでその混合物から１．０ｇを採取して化合水（化合水Ｂ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの混合物は小型ケトルに仕込み、焼き上がり品温１６５℃として２次焼成を行った。得られた焼石膏を室温に放冷後、小型ポットミルを用いて粉砕しブレーン 比表面積を約８０００cm2／gに調整してサンプルの焼石膏を得た。
［比較例１］
処理工程を図６に示す。
Raw material gypsum (1.5 kg) was charged into a small kettle and subjected to primary firing at a baked product temperature of 140 ° C. to obtain calcined gypsum. About 1.0 g was collected from the calcined gypsum after the primary firing, and the combined water (compound water A) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was placed in a sealed container and allowed to stand for 24 hours, and then the calcined gypsum was taken out from the sealed container, and the product temperature of the calcined gypsum was measured and then mixed with 1.5 kg of new raw material gypsum. In addition, 1.0g was extract | collected from the mixture here, and the compound water (compound water B) was measured with the test method by JISR9101. The remaining mixture was charged into a small kettle and subjected to secondary firing at a baked product temperature of 165 ° C. The obtained calcined gypsum was allowed to cool to room temperature and then pulverized using a small pot mill to adjust the brain specific surface area to about 8000 cm 2 / g to obtain a calcined gypsum sample.
[Comparative Example 1]
The processing steps are shown in FIG.
原料石膏３ｋｇを小型ケトルに仕込み、焼き上がり品温を１６５℃として１次焼成を行い、焼石膏を得た。焼石膏を密閉容器に入れ２４時間放置した後、焼石膏を密閉容器から取り出し、焼石膏の品温を測定後、小型ポットミルを用いて粉砕し、焼石膏のブレーン 比表面積を約８０００cm2／gに調整してサンプルの焼石膏を得た。
［比較例２］
処理工程を図７に示す。
3 kg of raw material gypsum was charged into a small kettle, and the final baking was performed at a baked product temperature of 165 ° C. to obtain calcined gypsum. After standing for 24 hours in a sealed vessel plaster of Paris, removed plaster of Paris from the closed vessel, after measuring the product temperature of the calcined gypsum was pulverized by using a small pot mill, about a Blaine specific surface area of the calcined gypsum 8000 cm 2 / g A calcined gypsum sample was prepared.
[Comparative Example 2]
The processing steps are shown in FIG.
原料石膏３ｋｇを小型ケトルに仕込み、焼き上がり品温を１６５℃として１次焼成を行い、焼石膏を得た。１次焼成後の焼石膏から約１．０ｇ採取して化合水（化合水Ａ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。焼石膏を密閉容器に入れ２４時間放置した後、焼石膏を密閉容器から取り出し、小型ポットミルを用いて粉砕し、焼石膏のブレーン 比表面積を約７０００cm2／gに調整した。これらの焼石膏は品温を測定した後、密閉容器に入れ焼石膏当たり３ｗｔ％の水を加え、直ちに１分間激しく攪拌することにより加水処理を行った。ここで、加水処理後の焼石膏から約１．０ｇ採取して化合水（化合水Ｂ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏は、乾燥機に入れ、設定温度を４０℃として２４時間放置して、焼石膏の残存自由水を蒸発させ、その後小型ポットミルを用いて粉砕しブレーン 比表面積を約８０００cm2／gに調整してサンプルの焼石膏を得た。
［比較例３］
処理工程を図７に示す。
3 kg of raw material gypsum was charged into a small kettle, and the final baking was performed at a baked product temperature of 165 ° C. to obtain calcined gypsum. About 1.0 g was collected from the calcined gypsum after the primary firing, and the combined water (compound water A) was measured by a test method according to JIS R 9101. The calcined gypsum was placed in a sealed container and allowed to stand for 24 hours, and then the calcined gypsum was taken out from the sealed container and pulverized using a small pot mill, and the bran specific surface area of the calcined gypsum was adjusted to about 7000 cm 2 / g. These calcined gypsums were measured for product temperature, then placed in a sealed container, added with 3 wt% water per calcined gypsum, and immediately subjected to hydration by vigorously stirring for 1 minute. Here, about 1.0 g was collected from the calcined gypsum after the hydrotreatment, and the combined water (compound water B) was measured by a test method according to JIS R 9101. The remaining calcined gypsum is put in a drier, left at a preset temperature of 40 ° C. for 24 hours, the remaining free water of the calcined gypsum is evaporated, and then pulverized using a small pot mill to have a specific surface area of about 8000 cm 2 / g. A calcined gypsum sample was prepared.
[Comparative Example 3]
The processing steps are shown in FIG.
原料石膏３ｋｇを小型ケトルに仕込み、焼き上がり品温を１６５℃として１次焼成を行い、焼石膏を得た。１次焼成後の焼石膏から約１．０ｇ採取して化合水（化合水Ａ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏を直ちに、小型ポットミルを用いて粉砕し、焼石膏のブレーン 比表面積を約７０００cm2／gに調整した。これらの焼石膏は品温を測定した後、密閉容器に入れ焼石膏当たり３ｗｔ％の水を加え、直ちに１分間激しく攪拌することにより加水処理を行った。ここで、加水処理後の焼石膏から約１．０ｇ採取して化合水（化合水Ｂ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。残りの焼石膏は、乾燥機に入れ、設定温度を４０℃として２４時間放置して、焼石膏の残存自由水を蒸発させ、その後小型ポットミルを用いて粉砕しブレーン 比表面積を約８０００cm2／gに調整してサンプルの焼石膏を得た。
［比較例４］
処理工程を図８に示す。
3 kg of raw material gypsum was charged into a small kettle, and the final baking was performed at a baked product temperature of 165 ° C. to obtain calcined gypsum. About 1.0 g was collected from the calcined gypsum after the primary firing, and the combined water (compound water A) was measured by a test method according to JIS R 9101. The remaining calcined gypsum was immediately pulverized using a small pot mill, and the bran specific surface area of the calcined gypsum was adjusted to about 7000 cm 2 / g. These calcined gypsums were measured for product temperature, then placed in a sealed container, added with 3 wt% water per calcined gypsum, and immediately subjected to hydration by vigorously stirring for 1 minute. Here, about 1.0 g was collected from the calcined gypsum after the hydrotreatment, and the combined water (compound water B) was measured by a test method according to JIS R 9101. The remaining calcined gypsum is put in a drier, left at a preset temperature of 40 ° C. for 24 hours, the remaining free water of the calcined gypsum is evaporated, and then pulverized using a small pot mill to have a specific surface area of about 8000 cm 2 / g. A calcined gypsum sample was prepared.
[Comparative Example 4]
The processing steps are shown in FIG.
原料石膏３ｋｇを小型ケトルに仕込み、焼き上がり品温を１６５℃として１次焼成を行い、焼石膏を得た。１次焼成後の焼石膏から約１．０ｇ採取して化合水（化合水Ａ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。焼石膏を密閉容器に入れ２４時間放置して、焼石膏を密閉容器から取り出し、小型ポットミルを用いて粉砕し、焼石膏のブレーン 比表面積を約７０００cm2／gに調整した。得られた焼石膏の５０ｗｔ％は加水処理し、残りの５０ｗｔ％の焼石膏（１次焼成のみの焼石膏）はそのままにした。加水処理する焼石膏は、品温を測定後、密閉容器に入れ焼石膏当たり３ｗｔ％の水を加え、直ちに１分間激しく攪拌することにより加水処理を行った。ここで、加水処理後の焼石膏から０．５ｇと１次焼成のみの焼石膏から０．５ｇを採取して混合し化合水（化合水Ｂ）をＪＩＳ Ｒ ９１０１による試験方法で測定した。加水処理後の焼石膏の残りは、乾燥機に入れ、設定温度を４０℃として２４時間放置して、焼石膏の残存自由水を蒸発させた。加水処理後、残存自由水を蒸発させた焼石膏と上記で得られた１次焼成のみの焼石膏の残りと併せて小型ポットミルを用いて粉砕し、ブレーン 比表面積を約８０００cm2／gに調整しサンプルの焼石膏を得た。 3 kg of raw material gypsum was charged into a small kettle, and the final baking was performed at a baked product temperature of 165 ° C. to obtain calcined gypsum. About 1.0 g was collected from the calcined gypsum after the primary firing, and the combined water (compound water A) was measured by a test method according to JIS R 9101. The calcined gypsum was placed in a sealed container and allowed to stand for 24 hours, and the calcined gypsum was taken out from the sealed container and pulverized using a small pot mill, and the bran specific surface area of the calcined gypsum was adjusted to about 7000 cm 2 / g. 50 wt% of the obtained calcined gypsum was hydrotreated, and the remaining 50 wt% calcined gypsum (calcined gypsum only for primary firing) was left as it was. The calcined gypsum to be hydrolyzed was added with water of 3 wt% per calcined gypsum after measuring the product temperature and immediately stirred vigorously for 1 min. Here, 0.5 g from the calcined gypsum after the hydrolysis treatment and 0.5 g from the calcined gypsum only subjected to the primary firing were collected and mixed, and the combined water (compound water B) was measured by a test method according to JIS R 9101. The remainder of the calcined gypsum after the hydration treatment was put into a dryer and left at a preset temperature of 40 ° C. for 24 hours to evaporate the remaining free water of the calcined gypsum. After the water treatment, the calcined gypsum from which the remaining free water was evaporated and the rest of the calcined gypsum obtained above were pulverized using a small pot mill to adjust the specific surface area of the brain to about 8000 cm 2 / g. A calcined gypsum sample was obtained.
実施例１〜８、参考例１〜４、及び比較例１〜４で得られたサンプルの焼石膏の物性試験を行った。 The physical property test of the calcined gypsum of the samples obtained in Examples 1 to 8, Reference Examples 1 to 4, and Comparative Examples 1 to 4 was performed.
この最終的な焼石膏の化合水（化合水Ｃと定義する）はＪＩＳ Ｒ ９１０１によった。焼石膏の混水量、凝結時間の試験方法はＪＩＳ Ｒ ９１１２によった。各試験結果と原料配合を表１（実施例１〜８、参考例１〜４）及び表２（比較例１〜４）に示す。実施例１〜８、参考例１〜４、及び比較例１〜４で得られた焼石膏は原料石膏へのリサイクル石膏の配合比率が増えるにつれて混水量が増大したが、一方でリサイクル石膏の配合比率の違いによる凝結時間の変化は見られなかった。 This final calcined gypsum compound water (defined as compound water C) was in accordance with JIS R 9101. The test method for the amount of mixed water and setting time of calcined gypsum was in accordance with JIS R 9112. Each test result and raw material composition are shown in Table 1 (Examples 1 to 8, Reference Examples 1 to 4 ) and Table 2 (Comparative Examples 1 to 4). In the calcined gypsum obtained in Examples 1 to 8, Reference Examples 1 to 4 and Comparative Examples 1 to 4, the amount of mixed water increased as the blending ratio of the recycled gypsum to the raw material gypsum increased. On the other hand, the blended recycled gypsum There was no change in the setting time due to the difference in the ratio.
実施例１で得られた焼石膏は、比較例１で得られた焼石膏よりも、混水量が２０％低減し、比較例２で得られた焼石膏よりも凝結時間が短く、比較例３で得られた焼石膏よりも混水量が少なく、また凝結時間が短く、比較例４で得られた焼石膏よりも混水量が少なく、また凝結時間が短くなっている。 The calcined gypsum obtained in Example 1 is 20% less mixed water than the calcined gypsum obtained in Comparative Example 1, and the setting time is shorter than that of the calcined gypsum obtained in Comparative Example 2. The amount of mixed water is less than that of the calcined gypsum obtained in the above, and the setting time is short. The amount of mixed water is less than that of the calcined gypsum obtained in Comparative Example 4, and the setting time is short.
参考例１で得られた焼石膏は、実施例１で得られた焼石膏よりもさらに混水量が２０％低減している。 The amount of water mixed in the calcined gypsum obtained in Reference Example 1 is further reduced by 20% compared to the calcined gypsum obtained in Example 1.
実施例２で得られた焼石膏は、参考例１で得られた焼石膏よりもさらに混水量が１０％低減している。 The amount of water mixed in the calcined gypsum obtained in Example 2 is 10% lower than that of the calcined gypsum obtained in Reference Example 1 .
実施例３で得られた焼石膏は、実施例１で得られた焼石膏よりもさらに凝結時間が短くなっている。 The calcined gypsum obtained in Example 3 has a shorter setting time than the calcined gypsum obtained in Example 1.
参考例２で得られた焼石膏は、実施例１で得られた焼石膏よりも混水量が、２０％低減し、また凝結時間が短くなっている。 In the calcined gypsum obtained in Reference Example 2 , the amount of mixed water is reduced by 20% compared to the calcined gypsum obtained in Example 1, and the setting time is shortened.
実施例４で得られた焼石膏は、参考例２で得られた焼石膏よりも混水量が、１０％低減している。 The amount of water mixed in the calcined gypsum obtained in Example 4 is 10% lower than that of the calcined gypsum obtained in Reference Example 2 .
実施例５で得られた焼石膏は、実施例１で得られた焼石膏よりも若干混水量が多くなるが問題になるほどでもない。 The calcined gypsum obtained in Example 5 has a slightly larger amount of mixed water than the calcined gypsum obtained in Example 1, but is not so problematic.
参考例３で得られた焼石膏は、実施例１で得られた焼石膏と同等の混水量及び凝結時間を示す。 The calcined gypsum obtained in Reference Example 3 exhibits a mixed water amount and a setting time equivalent to those of the calcined gypsum obtained in Example 1.
実施例６で得られた焼石膏は、実施例１で得られた焼石膏よりも混水量が、１０％低減している。 The amount of water mixed in the calcined gypsum obtained in Example 6 is 10% lower than that in the calcined gypsum obtained in Example 1.
実施例７で得られた焼石膏は、実施例１で得られた焼石膏よりも若干混水量が多くなるが問題になるほどでもない。 The calcined gypsum obtained in Example 7 has a slightly larger amount of mixed water than the calcined gypsum obtained in Example 1, but is not so problematic.
参考例４で得られた焼石膏は、実施例１で得られた焼石膏と同等の混水量及び凝結時間を示す。 The calcined gypsum obtained in Reference Example 4 shows a mixed water amount and setting time equivalent to the calcined gypsum obtained in Example 1.
実施例８で得られた焼石膏は、実施例１で得られた焼石膏よりも混水量が、１０％低減している。 The amount of water mixed in the calcined gypsum obtained in Example 8 is 10% less than that of the calcined gypsum obtained in Example 1.
すなわち本発明は、原料石膏を１次焼成後、加水処理し２次焼成することによって、混水量が低く、かつ凝結時間が短い焼石膏を得ることができる。 That is, according to the present invention, calcined gypsum having a low amount of mixed water and a short setting time can be obtained by subjecting the raw material gypsum to primary calcination, followed by water treatment and secondary calcination.
さらに、加水処理に原料石膏の付着水を利用することにより、加水処理のための新たな設備を備える必要もなく、コストを大幅に削減でき、混水量が低く、かつ凝結時間が短い焼石膏を得ることができる。 Furthermore, by using the water adhering to the raw gypsum for the hydration treatment, it is not necessary to provide new equipment for the hydration treatment, and the cost can be significantly reduced. Can be obtained.
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