JP4802255B2 - Gypsum-based solidifying material mainly composed of a gypsum composition capable of suppressing hydrogen sulfide - Google Patents
Gypsum-based solidifying material mainly composed of a gypsum composition capable of suppressing hydrogen sulfide Download PDFInfo
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- JP4802255B2 JP4802255B2 JP2009053660A JP2009053660A JP4802255B2 JP 4802255 B2 JP4802255 B2 JP 4802255B2 JP 2009053660 A JP2009053660 A JP 2009053660A JP 2009053660 A JP2009053660 A JP 2009053660A JP 4802255 B2 JP4802255 B2 JP 4802255B2
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- 239000010440 gypsum Substances 0.000 title claims description 114
- 229910052602 gypsum Inorganic materials 0.000 title claims description 114
- 239000000203 mixture Substances 0.000 title claims description 47
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 title claims description 38
- 229910000037 hydrogen sulfide Inorganic materials 0.000 title claims description 38
- 239000000463 material Substances 0.000 title claims description 24
- -1 aluminum compound Chemical class 0.000 claims description 29
- 229910052782 aluminium Inorganic materials 0.000 claims description 25
- 239000002699 waste material Substances 0.000 claims description 17
- 239000002689 soil Substances 0.000 claims description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 230000003472 neutralizing effect Effects 0.000 claims description 14
- 239000011575 calcium Substances 0.000 claims description 8
- 239000011499 joint compound Substances 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 6
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical group [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 6
- BUACSMWVFUNQET-UHFFFAOYSA-H dialuminum;trisulfate;hydrate Chemical compound O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O BUACSMWVFUNQET-UHFFFAOYSA-H 0.000 claims description 6
- 239000010802 sludge Substances 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 5
- 239000011777 magnesium Substances 0.000 claims description 5
- 229910052749 magnesium Inorganic materials 0.000 claims description 5
- 239000000920 calcium hydroxide Substances 0.000 claims description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 238000001354 calcination Methods 0.000 claims 1
- 239000000047 product Substances 0.000 description 14
- 241000894006 Bacteria Species 0.000 description 12
- 230000000694 effects Effects 0.000 description 12
- 239000004566 building material Substances 0.000 description 10
- 239000002994 raw material Substances 0.000 description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 7
- 239000011593 sulfur Substances 0.000 description 7
- 229910052717 sulfur Inorganic materials 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 230000019086 sulfide ion homeostasis Effects 0.000 description 6
- 230000007935 neutral effect Effects 0.000 description 5
- PYKYMHQGRFAEBM-UHFFFAOYSA-N anthraquinone Natural products CCC(=O)c1c(O)c2C(=O)C3C(C=CC=C3O)C(=O)c2cc1CC(=O)OC PYKYMHQGRFAEBM-UHFFFAOYSA-N 0.000 description 4
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical group O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 4
- 238000002407 reforming Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 3
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- 239000011507 gypsum plaster Substances 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 241000605739 Desulfovibrio desulfuricans Species 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000233866 Fungi Species 0.000 description 1
- 206010067482 No adverse event Diseases 0.000 description 1
- TYYRFZAVEXQXSN-UHFFFAOYSA-H aluminium sulfate hexadecahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O TYYRFZAVEXQXSN-UHFFFAOYSA-H 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000012258 culturing Methods 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229930014626 natural product Natural products 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Description
本発明は、硫化水素発生を抑制できる石膏組成物を主成分とする石膏系固化材に関し、さらに詳しくは、石膏の硫黄成分によって硫化水素が発生し難いように構成されている硫化水素発生を抑制できる石膏組成物を主成分とする石膏系固化材に関する。 The present invention relates to a gypsum-based solidified material mainly composed of a gypsum composition capable of suppressing hydrogen sulfide generation. More specifically, the present invention suppresses hydrogen sulfide generation that is configured so that hydrogen sulfide is hardly generated by the sulfur component of gypsum. The present invention relates to a gypsum-based solidifying material having a gypsum composition as a main component .
近年、不法投棄現場などで石膏が硫黄源となって硫化水素を発生することが問題となっている。その発生のメカニズムも明らかになってきており、下記の条件の全てが揃った場合に硫化水素が発生することがわかってきた。すなわち、この場合に硫化水素が発生する主たる原因は、土壌等の中に生息している硫酸塩還元菌の活動による。そして、硫酸塩還元菌が硫化水素を発生させるには、少なくとも、硫酸イオンが高濃度で存在しており、無酸素状態（嫌気性）で、栄養源となる有機物が高濃度で存在し、さらに水が溜まった状態であり、かつ、硫酸塩還元菌の活動に適した温度（３０〜３８℃）、ｐＨ（３〜９）であるという全ての条件が揃うことが必要である。 In recent years, it has been a problem that gypsum is used as a sulfur source to generate hydrogen sulfide at illegal dumping sites. The mechanism of its generation has also become clear, and it has been found that hydrogen sulfide is generated when all of the following conditions are met. That is, in this case, the main cause of the generation of hydrogen sulfide is due to the activity of sulfate-reducing bacteria that live in the soil. In order for sulfate-reducing bacteria to generate hydrogen sulfide, at least sulfate ions are present in a high concentration, anoxic (anaerobic), organic substances that are nutrient sources are present in a high concentration, It is necessary to satisfy all the conditions that water is accumulated and that the temperature (30 to 38 ° C.) and pH (3 to 9) are suitable for the activity of sulfate-reducing bacteria.
石膏中の硫黄成分が原因となる硫化水素の発生は、前述のように石膏製品の廃棄物等が不法投棄される等、不適切な処理によるものが大半であるが、このような状況の発生を根絶することは難しいと考えられる。したがって、石膏製品の廃棄物等の不法投棄等がされた場合でも、硫化水素の発生を抑制できることが望まれるが、そのためには、石膏製品そのものが硫化水素を発生しにくい仕様となっていることが要望される。 The generation of hydrogen sulfide caused by sulfur components in gypsum is mostly due to improper treatment, such as illegal dumping of gypsum product waste as described above. It is considered difficult to eradicate. Therefore, it is desirable to be able to suppress the generation of hydrogen sulfide even if illegal dumping of gypsum product waste, etc., but for that purpose, the gypsum product itself has specifications that make it difficult to generate hydrogen sulfide. Is required.
一方、汚泥や泥土の改質を中性で行う一つの方法として、石膏系の固化材を利用することが行われている。さらに、建材のリサイクルを推進するために、石膏系の固化材の原料として、建築廃材である廃石膏ボードから分離・回収されるリサイクル石膏、あるいは石膏故型（ふるがた）に由来するリサイクル石膏等（以後「廃石膏」と略す）を利用することも検討されている。しかし、廃石膏には、一部有機物の混入も予想されるため、この場合は、石膏中の硫黄成分が硫化水素の硫黄の供給源となるという問題に加えて、僅かではあるが硫酸塩還元菌の栄養源が増加して硫化水素発生の可能性が高まる点も考慮しなければならない。出願人の一はこれまでに、石膏を主材とする土壌処理剤において、アントラキノン化合物を添加することで、石膏中の硫黄成分に起因する硫化水素の発生を抑制することを提案している（特許文献１参照）。 On the other hand, a gypsum-based solidifying material is used as one method for neutralizing sludge and mud. Furthermore, in order to promote the recycling of building materials, as a raw material for gypsum-based solidifying materials, recycled gypsum that is separated and recovered from waste gypsum board, which is building waste, or recycled gypsum derived from a plaster mold (furugata) Etc. (hereinafter abbreviated as “waste gypsum”) is also being considered. However, waste gypsum is also expected to contain some organic substances. In this case, in addition to the problem that the sulfur component in gypsum becomes a source of sulfur for hydrogen sulfide, a slight reduction of sulfate It must also be taken into account that the possibility of hydrogen sulfide generation increases due to an increase in the nutrient source of the fungus. One of the applicants has proposed to suppress the generation of hydrogen sulfide due to sulfur components in gypsum by adding an anthraquinone compound in a soil treatment agent mainly composed of gypsum ( Patent Document 1).
しかしながら、アントラキノン化合物は高価であり製品の価格上昇を招来するため、例えば、土壌改質の際に使用する固化材等、石膏組成物を大量に使用する用途にあっては経済的な問題があり、利用が拡大できないという実用上の課題があった。また、石膏系建材の原料として利用できる石膏組成物とするためには、石膏ボード製品や、石膏プラスターや、石膏ボード用目地処理材等の製品とした場合に、その品質や施工作業性において従来品と何ら遜色のないものであることを要し、その観点から原料選択しなければならないという制約がある。 However, since anthraquinone compounds are expensive and cause an increase in the price of products, there are economical problems in applications where a large amount of gypsum composition is used, such as a solidifying material used for soil reforming. There was a practical problem that the use could not be expanded. In addition, in order to obtain a gypsum composition that can be used as a raw material for gypsum-based building materials, in the case of gypsum board products, gypsum plaster, joint products for gypsum board, etc. There is a restriction that it is necessary to select raw materials from that viewpoint.
したがって、本発明の目的は、安価であり、土壌改質の際に使用する固化材等の大量に消費される用途においても利用ができ、かつ、廃棄された場合や土壌改質等に使用された場合に、従来のものに比較して硫化水素発生がしにくい仕様のものである実用価値の高い石膏組成物（すなわち、硫化水素発生を抑制できる石膏組成物）を提供することにある。さらに、本発明の別の目的は、従来品に、さらに上記の優れた特性が付与された石膏系建材を提供することにある。 Therefore, the object of the present invention is inexpensive, can be used in applications that are consumed in large quantities, such as solidified materials used in soil reforming, and is used for disposal or soil reforming. It is an object to provide a gypsum composition having a high practical value (that is, a gypsum composition capable of suppressing the generation of hydrogen sulfide), which has a specification in which hydrogen sulfide generation is less likely to occur than conventional ones. Furthermore, another object of the present invention is to provide a gypsum-based building material in which the above-described excellent characteristics are further imparted to a conventional product.
上記目的は、以下の本発明を特徴づける石膏組成物によって達成される。すなわち、（Ａ）焼石膏１００質量部に対して、（Ｂ）酸化アルミニウム、塩化アルミニウム、水酸化アルミニウム、硫酸アルミニウム及びそれらの誘導体からなる群から選ばれる少なくとも１種のアルミニウム化合物が０．８〜２０質量部の範囲で添加されてなることを特徴とする硫化水素発生を抑制できる石膏組成物である。 The above object is achieved by the gypsum composition characterizing the present invention below. That is , with respect to 100 parts by mass of ( A) calcined gypsum, at least one aluminum compound selected from the group consisting of (B) aluminum oxide, aluminum chloride, aluminum hydroxide, aluminum sulfate and derivatives thereof is 0.8 to It is a gypsum composition capable of suppressing the generation of hydrogen sulfide, characterized by being added in the range of 20 parts by mass.
また、本発明の好ましい形態としては、さらに、（Ｃ）カルシウム又はマグネシウム成分を含む中和剤が添加混合されてなる前記の石膏組成物が挙げられる。 Moreover, as a preferable form of this invention, the said gypsum composition formed by further adding and mixing the (C) neutralizing agent containing a calcium or magnesium component is mentioned.
また、本発明の好ましい形態としては、前記（Ｂ）のアルミニウム化合物がアルミニウム硫酸塩水和物［Ａl2(ＳＯ4)3・ｎＨ2Ｏ］であり、かつ、（Ｃ）中和剤が水酸化カルシウム［Ｃａ(ＯＨ)2］であり、該（Ｃ）の中和剤が、上記（Ｂ）のアルミニウム化合物の０．１〜０．７５倍の質量の範囲で添加混合されている上記の石膏組成物が挙げられる。 In a preferred embodiment of the present invention, the aluminum compound (B) is aluminum sulfate hydrate [Al 2 (SO 4 ) 3 · nH 2 O], and (C) the neutralizing agent is hydroxylated. The above-mentioned gypsum, which is calcium [Ca (OH) 2 ] and in which the neutralizing agent (C) is added and mixed in a mass range of 0.1 to 0.75 times that of the aluminum compound (B). A composition.
また、本発明の好ましい形態としては、前記焼石膏の一部又は全部が、廃石膏を焼成したものである上記いずれかの石膏組成物が挙げられる。 Moreover, as a preferable form of the present invention, any one of the above gypsum compositions in which a part or all of the calcined gypsum is obtained by baking waste gypsum is mentioned.
さらに、本発明の別の実施形態としては、上記いずれかの石膏組成物を有することを特徴とする建設残土や汚泥や泥土の土壌処理用の石膏系固化材が挙げられる。より具体的には、本発明では、建設残土や汚泥や泥土の土壌処理用の石膏系固化材であって、（Ａ）焼石膏１００質量部に対して、（Ｂ）アルミニウム化合物が０．８〜２０質量部の範囲で添加されてなる硫化水素発生を抑制できる石膏組成物（但し、セメントおよび／又はスラグを含むものを除く）を主成分とし、かつ、上記（Ｂ）のアルミニウム化合物がアルミニウム硫酸塩水和物［Ａｌ 2 (ＳＯ 4 ) 3 ・ｎＨ 2 Ｏ（ｎ＝６，１０，１６，１８，２７）］であることを特徴とする土壌処理用の石膏系固化材を提供する。 Furthermore, as another embodiment of the present invention, there is a gypsum-based solidifying material for soil treatment of construction residual soil, sludge and mud, characterized by having any of the gypsum compositions described above. More specifically, the present invention provides a gypsum-based solidifying material for soil treatment of construction waste soil and sludge and mud, with respect to (A) calcined gypsum 100 parts by weight, (B) A aluminum compound 0. An aluminum compound having the gypsum composition (except for those containing cement and / or slag ), which is added in the range of 8 to 20 parts by mass and capable of suppressing the generation of hydrogen sulfide, as the main component , and the aluminum compound of the above (B) It provides but aluminum sulfate hydrate [Al 2 (SO 4) 3 · nH 2 O (n = 6,10,16,18,27)] gypsum solidifying material for soil treatment, characterized in der Rukoto To do.
本発明によれば、埋め立てなどに使用される建設残土や汚泥等を固化処理する場合に安価な固化材として利用することができ、かつ、従来のものに比べて、施工後に硫化水素の発生を有効に抑制できる石膏組成物が提供される。また、本発明の好ましい形態によれば、固化処理後の処理物は充分な強度を有し、運搬や埋立て時のハンドリングが容易であり、しかも、確実に環境へ配慮した中性のものにすることができる石膏組成物が提供される。また、本発明の好ましい形態によれば、その原料として廃石膏を焼成したものが利用できるため、建築廃材である廃石膏ボードのリサイクルの問題にも寄与でき、上述の優れた性能と併せて、さらなる環境配慮型の石膏組成物の提供が可能となる。さらに、本発明によれば、従来品と何ら遜色のない品質や施工作業性を有するものでありながら、不法投棄等され、特定の条件下に放置されたとしても、硫化水素発生を有効に抑制できる石膏系建材が提供される。 According to the present invention, it can be used as an inexpensive solidifying material when solidifying construction soil or sludge used for land reclamation and the like, and compared with the conventional one, generation of hydrogen sulfide after construction is possible. A gypsum composition that can be effectively suppressed is provided. Further, according to a preferred embodiment of the present invention, the processed product after the solidification treatment has sufficient strength, is easy to handle during transportation and landfill, and is surely neutral with consideration for the environment. A gypsum composition is provided. In addition, according to a preferred embodiment of the present invention, since the waste gypsum baked as the raw material can be used, it can contribute to the problem of recycling waste gypsum board that is a building waste material, together with the above-mentioned excellent performance, Further environment-friendly gypsum composition can be provided. Furthermore, according to the present invention, the hydrogen sulfide generation is effectively suppressed even if it is illegally dumped and left under specific conditions, while having quality and construction workability comparable to conventional products. A gypsum-based building material is provided.
以下、好ましい実施の形態を挙げて、本発明をさらに詳細に説明する。本発明者らは、上記した従来技術の課題を解決し、石膏系建材が不法投棄等されたり、固化材等として大量に使用された場合にも硫化水素の発生を抑制でき、しかも、石膏系建材の原料とした場合に製品の品質や施工性に影響がなく、大量使用が可能となる安価な石膏組成物を提供することを目的として鋭意検討を行った。その結果、石膏にアルミニウムイオンを併存させると硫酸塩還元菌の活動が抑制され、結果として、硫化水素の発生を有効に抑制できることを見出して本発明に至った。より具体的には、酸化アルミニウム、塩化アルミニウム、水酸化アルミニウム、硫酸アルミニウム及びそれらの誘導体からなる群から選ばれる少なくとも１種のアルミニウム化合物が、焼石膏１００質量部に対して、０．８〜２０質量部の範囲で添加されてなる石膏組成物は、硫化水素の発生を抑制できる仕様のものとなる。 Hereinafter, the present invention will be described in more detail with reference to preferred embodiments. The present inventors have solved the above-mentioned problems of the prior art and can suppress the generation of hydrogen sulfide even when gypsum-based building materials are dumped illegally or used in large quantities as solidifying materials, etc. In the interest of providing an inexpensive gypsum composition that can be used in large quantities without affecting the quality and workability of the product when used as a building material. As a result, it was found that when aluminum ions coexist in gypsum, the activity of sulfate-reducing bacteria was suppressed, and as a result, the generation of hydrogen sulfide could be effectively suppressed and the present invention was achieved. More specifically, at least one aluminum compound selected from the group consisting of aluminum oxide, aluminum chloride, aluminum hydroxide, aluminum sulfate and derivatives thereof is 0.8 to 20 with respect to 100 parts by mass of calcined gypsum. The gypsum composition added in the range of parts by mass has a specification that can suppress the generation of hydrogen sulfide.
本発明者らは、土壌に、焼石膏、有機酸（乳酸あるいは酢酸）、硫酸塩還元菌としてDesulfovibrio desulfuricans NBRC 13699Tを加えて、嫌気条件下で培養するという過酷な条件下で、種々の化合物を添加して、硫化水素の発生の抑制効果についての確認試験を行った。その結果、上記した培養条件にアルミニウム化合物を加えると、硫化水素の発生に有意な抑制効果があることを解明し、本発明に至った。先に述べたように、アントラキノン化合物を添加してなる石膏組成物に硫化水素発生の抑制効果があることは、従来知られている。しかし、アントラキノン化合物は非常に高価であり、実用化のためには経済性を満足しなければならなかったが、アルミニウム化合物は比較的に安価であり、経済性の問題が解決される。 The present inventors added various compounds under severe conditions such as calcined gypsum, organic acid (lactic acid or acetic acid), and Desulfovibrio desulfuricans NBRC 13699 T as sulfate-reducing bacteria and culturing under anaerobic conditions. And a confirmation test was conducted on the effect of suppressing the generation of hydrogen sulfide. As a result, it was elucidated that the addition of an aluminum compound to the culture conditions described above has a significant inhibitory effect on the generation of hydrogen sulfide, leading to the present invention. As described above, it is conventionally known that a gypsum composition formed by adding an anthraquinone compound has an effect of suppressing the generation of hydrogen sulfide. However, anthraquinone compounds are very expensive and have to satisfy economics for practical use, but aluminum compounds are relatively inexpensive and solve the problem of economics.
本発明者らは、上記した知見に基づき、さらに詳細な検討を行った結果、アルミニウム化合物の中でも、アルミニウム硫酸塩水和物［Ａｌ2(ＳＯ4)3・ｎＨ2Ｏ］を使用した場合に、より顕著な効果が得られることを見出した。さらに、カルシウム又はマグネシウム成分を含む中和剤を添加混合させることが好ましく、特に中和剤として水酸化カルシウム［Ｃａ(ＯＨ)2］を添加させることが好ましいことがわかった。このような形態とすれば、石膏組成物からの硫化水素発生が有効に抑制できると同時に、例えば、固化材として大量に使用した場合にも、その処理物は中性となるので環境に与える影響が少ない。 As a result of further detailed examination based on the above-described findings, the inventors of the present invention, among aluminum compounds, when aluminum sulfate hydrate [Al 2 (SO 4 ) 3 .nH 2 O] is used, It has been found that a more remarkable effect can be obtained. Furthermore, it has been found that it is preferable to add and mix a neutralizing agent containing calcium or magnesium component, and it is particularly preferable to add calcium hydroxide [Ca (OH) 2 ] as a neutralizing agent. With such a form, hydrogen sulfide generation from the gypsum composition can be effectively suppressed, and at the same time, for example, even when used in a large amount as a solidifying material, the treated product becomes neutral and has an impact on the environment. Less is.
本発明者らの検討によれば、本発明の石膏組成物は、焼石膏と、硫酸塩還元菌の活動を抑制する機能を有するアルミニウム化合物とが均一な状態に混合されたものとなる。このため、例えば、本発明の石膏組成物を固化材として使用した場合に、その効果の発現が安定に得られ、固化処理後の土壌からの硫化水素の発生がより効率的に抑制される。 According to the study by the present inventors, the gypsum composition of the present invention is a mixture of calcined gypsum and an aluminum compound having a function of suppressing the activity of sulfate-reducing bacteria in a uniform state. For this reason, for example, when the gypsum composition of the present invention is used as a solidifying material, the effect is stably obtained, and the generation of hydrogen sulfide from the soil after the solidification treatment is more efficiently suppressed.
以下、本発明の石膏組成物を構成する各資材について説明する。
（焼石膏）
焼石膏は、硫酸カルシウムの１／２水和物［ＣａＳＯ4・１／２Ｈ2Ｏ］であり、固化性能を有する。すなわち、半水石膏は、泥土中の水と化学反応し、容易に二水石膏に変化するため、これで処理した泥土等は固化して強度を有するものとなる。焼石膏としては、β型半水石膏、α型半水石膏、III型無水石膏、又はそれらの混合物などが挙げられ、いずれも用いることができる。焼石膏の原料石膏としては、天然物、副生石膏あるいは廃石膏のいずれでもよいが、経済性を考慮すると廃石膏を用いることがより好ましい。
Hereinafter, each material which comprises the gypsum composition of this invention is demonstrated.
(Calcined gypsum)
The calcined gypsum is calcium sulfate hemihydrate [CaSO 4 · 1 / 2H 2 O] and has a solidifying performance. That is, hemihydrate gypsum chemically reacts with the water in the mud and easily changes to dihydrate gypsum, so that the mud treated with this solidifies and has strength. Examples of calcined gypsum include β-type hemihydrate gypsum, α-type hemihydrate gypsum, type III anhydrous gypsum, and mixtures thereof, and any of them can be used. The raw gypsum for calcined gypsum may be a natural product, by-product gypsum, or waste gypsum, but it is more preferable to use waste gypsum in consideration of economy.
（アルミニウム化合物）
本発明の石膏組成物を構成するアルミニウム化合物は、硫酸塩還元菌の活動を抑制でき、これによって硫化水素の発生を抑制させることを可能にする成分である。本発明で使用するアルミニウム化合物は、酸化アルミニウム、塩化アルミニウム、水酸化アルミニウム、硫酸アルミニウム及びそれらの誘導体からなる群から選ばれる。本発明者らの検討によれば、これらの中でも特に、アルミニウム硫酸塩水和物［Ａl2(ＳＯ4)3・ｎＨ2Ｏ（ｎ＝６，１０，１６，１８，２７）］は、反応性に富み、そのアルミニウムイオンが硫酸塩還元菌の活動をより効率よく抑制できる。その結果、石膏を構成する硫黄成分を一因として生じることのあった硫化水素の発生を、より確実に抑制することができるようになる。
(Aluminum compound)
The aluminum compound constituting the gypsum composition of the present invention is a component that can suppress the activity of sulfate-reducing bacteria and thereby suppress the generation of hydrogen sulfide. The aluminum compound used in the present invention is selected from the group consisting of aluminum oxide, aluminum chloride, aluminum hydroxide, aluminum sulfate and derivatives thereof. According to the study by the present inventors, among these, aluminum sulfate hydrate [Al 2 (SO 4 ) 3 .nH 2 O (n = 6, 10, 16, 18, 27)] is particularly reactive. The aluminum ions can suppress the activity of sulfate-reducing bacteria more efficiently. As a result, it is possible to more reliably suppress the generation of hydrogen sulfide that may have been caused by the sulfur component constituting gypsum.
本発明の石膏組成物は、焼石膏１００質量部に対して、上記に挙げたようなアルミニウム化合物を０．８〜２０質量部の範囲で添加してなる。すなわち、焼石膏１００質量部に対して、アルミニウム化合物の添加量が０．８質量部よりも少ないものは、硫化水素の発生抑制効果が充分ではなく、一方、２０質量部よりも多く混合させたものは、材料コストが高くなって経済的でない。好ましくは、焼石膏１００質量部に対して、アルミニウム化合物を３〜２０質量部の範囲で添加するとよい。より好ましくは、焼石膏１００質量部に対して、アルミニウム化合物を８〜１５質量部の範囲で添加するとよい。 The gypsum composition of the present invention is obtained by adding the above-described aluminum compound in a range of 0.8 to 20 parts by mass with respect to 100 parts by mass of calcined gypsum. That is, when the amount of aluminum compound added is less than 0.8 parts by mass with respect to 100 parts by mass of calcined gypsum, the effect of suppressing the generation of hydrogen sulfide is not sufficient, while more than 20 parts by mass is mixed. Things are not economical due to high material costs. Preferably, the aluminum compound may be added in the range of 3 to 20 parts by mass with respect to 100 parts by mass of calcined gypsum. More preferably, it is good to add an aluminum compound in the range of 8-15 mass parts with respect to 100 mass parts of calcined gypsum.
（カルシウム成分又はマグネシウム成分を含む中和剤）
本発明の石膏組成物は、必要に応じてカルシウム成分又はマグネシウム成分を含む中和剤を含有してなるが、特に水酸化カルシウムが好適である。その他、酸化カルシウム、酸化マグネシウム及び水酸化マグネシウムなども使用できる。かかる成分は、焼石膏とアルミニウム化合物との組成物のｐＨを中性域に調整する。本発明に好適な水酸化カルシウム［Ｃａ(ＯＨ)2］は、酸化カルシウムを加水して得られる。酸化カルシウムの原料となる炭酸カルシウムは、重質炭酸カルシウムでも軽質炭酸カルシウムでもよく、種類は問わない。中和剤の添加量は、処理後の処理物が、中性になる範囲であればよく、具体的には、本発明の石膏組成物のｐＨが５.８〜８.６になる範囲であればよい。中和剤として、例えば、水酸化カルシウムを用いる場合には、前記したアルミニウム化合物の０．１〜０．７５倍の質量となる範囲で添加混合させることが好ましい。
(Neutralizing agent containing calcium component or magnesium component)
Although the gypsum composition of this invention contains the neutralizing agent containing a calcium component or a magnesium component as needed, calcium hydroxide is especially suitable. In addition, calcium oxide, magnesium oxide, and magnesium hydroxide can also be used. Such components adjust the pH of the calcined gypsum and aluminum compound composition to a neutral range. Calcium hydroxide [Ca (OH) 2 ] suitable for the present invention is obtained by adding calcium oxide. The calcium carbonate used as a raw material for calcium oxide may be heavy calcium carbonate or light calcium carbonate, and the type is not limited. The addition amount of the neutralizing agent may be in a range in which the treated product becomes neutral, specifically, in a range in which the pH of the gypsum composition of the present invention becomes 5.8 to 8.6. I just need it. For example, when calcium hydroxide is used as the neutralizing agent, it is preferable to add and mix in the range of 0.1 to 0.75 times the mass of the aluminum compound described above.
次に、実施例及び比較例を挙げて、本発明を具体的に説明する。なお、以下の記載で「部」とあるのは、特に断りのない限り質量基準である。 Next, an Example and a comparative example are given and this invention is demonstrated concretely. In the following description, “part” is based on mass unless otherwise specified.
［実施例及び比較例］
焼石膏とアルミニウム化合物と、中和剤として水酸化カルシウムを用いて、表１に示した配合の実施例及び比較例の石膏組成物を作製した。焼石膏には、廃石膏を粉砕して焼成して得られたものを使用した。アルミニウム化合物としては、アルミニウム硫酸塩水和物［Ａl2(ＳＯ4)3・１６Ｈ2Ｏ］を用いた。
[Examples and Comparative Examples]
Using the calcined gypsum, the aluminum compound, and calcium hydroxide as the neutralizing agent, the gypsum compositions of Examples and Comparative Examples having the formulations shown in Table 1 were prepared. The calcined gypsum used was obtained by pulverizing and firing waste gypsum. As the aluminum compound, aluminum sulfate hydrate [Al 2 (SO 4 ) 3 .16H 2 O] was used.
＜評価＞
表１に示した配合からなる実施例及び比較例の各石膏組成物１ｋｇに、酢酸を０．０２ｍLと、硫酸塩還元菌としてDesulfovibrio desulfuricans NBRC 13699T（4×１０6cells／ｍＬ）を４ｍＬ加えて、それぞれを嫌気条件下で培養した。なお、この条件は、硫化水素を発生させるために行ったかなり過酷なものであり、決して、土壌改質現場や不法投棄等の現場の状態を再現したものではない。上記の状態で１ヶ月養生した後における硫化水素の発生量と、硫酸塩還元菌の菌体数を測定した。そして、得られた結果を表２に示した。
<Evaluation>
0.02 mL of acetic acid and 4 mL of Desulfovibrio desulfuricans NBRC 13699 T (4 × 10 6 cells / mL) as sulfate-reducing bacteria are added to 1 kg of each gypsum composition of the examples and comparative examples having the formulations shown in Table 1. Each was cultured under anaerobic conditions. Note that this condition is quite harsh in order to generate hydrogen sulfide, and never reproduces the state of the site such as a soil reforming site or illegal dumping. The amount of hydrogen sulfide generated after curing for 1 month in the above state and the number of sulfate-reducing bacteria were measured. The obtained results are shown in Table 2.
表２に示した通り、実施例の石膏組成物を用いた場合はいずれも、比較例の場合に比べて明確に硫化水素の発生が抑制されていることが確認された。さらに、硫酸塩還元菌の菌体数の測定結果から、実施例の石膏組成物を用いた場合はいずれも、比較例の場合に比べて明確に硫酸塩還元菌の活動が抑制されていることが確認された。また、実施例の石膏組成物を含水比率４０％の泥土１ｍ3のそれぞれに対して、１００ｋｇ添加後、十分に混練して固化処理を行った。その結果、処理物はいずれも固化されており、ハンドリングに耐え得る十分な強度を有するものであり、さらに、そのいずれもが、環境への影響のない中性と判断される範囲であることを確認した。 As shown in Table 2, it was confirmed that in all cases where the gypsum composition of the example was used, generation of hydrogen sulfide was clearly suppressed as compared with the case of the comparative example. Furthermore, from the measurement results of the number of cells of sulfate-reducing bacteria, the activity of the sulfate-reducing bacteria is clearly suppressed in all cases using the gypsum composition of the example as compared with the case of the comparative example. Was confirmed. Further, 100 kg of the gypsum composition of the example was added to each 1 m 3 of mud having a water content of 40%, and then sufficiently kneaded and solidified. As a result, all the processed products are solidified and have sufficient strength to withstand handling, and all of them are in a range that is judged to be neutral without affecting the environment. confirmed.
また一方、実施例の石膏組成物を用いて、板状に成型した、例えばＪＩＳ Ａ６９０１石膏ボード製品や、粉粒状で水と反応して硬化するＪＩＳ Ａ６９０４せっこうプラスター、ＪＩＳＡ６９１４石膏ボード用目地処理材等、の石膏系建材を製造することが可能で、これら石膏系建材の製造ラインで問題を引き起こすことがないことを確認した。そして、原料となる石膏組成物によって、これらの石膏系建材そのものの性能や施工作業性に何らの悪影響を及ぼさないことも確認した。さらに、実施例の石膏組成物を原料として製造された石膏ボードや石膏プラスターを試料として、先に述べたと同様の過酷な条件による試験を実施したところ、従来のものと比較して硫化水素の発生の抑制が明確に認められた。 On the other hand, for example, a JIS A6901 gypsum board product molded into a plate shape using the gypsum composition of the example, a JIS A6904 gypsum plaster that is cured in a granular form by reacting with water, and a joint treatment material for JIS A6914 gypsum board It was confirmed that it was possible to produce gypsum-based building materials, and that no problems were caused in the production line for these gypsum-based building materials. It was also confirmed that the gypsum composition as a raw material had no adverse effects on the performance and construction workability of these gypsum building materials themselves. Furthermore, when a test was conducted under the same severe conditions as described above using a gypsum board or a gypsum plaster produced using the gypsum composition of the example as a raw material, generation of hydrogen sulfide was compared with the conventional one. Was clearly observed.
本発明の活用例としては、廃石膏を原料としているにもかかわらず、汚泥や泥土の固化材として使用した場合に、硫化水素の発生を格段に抑制することができる石膏組成物が挙げられる。本発明の活用例としては、不法投棄等された場合にも硫化水素の発生を格段に抑制することができる各種石膏系建材の原料として有用な石膏組成物が挙げられる。本発明の活用例としては、廃石膏の有効利用を可能とする石膏組成物が挙げられる。 An example of utilization of the present invention is a gypsum composition that can remarkably suppress the generation of hydrogen sulfide when used as a solidifying material for sludge or mud, although waste gypsum is used as a raw material. Examples of utilization of the present invention include gypsum compositions useful as raw materials for various gypsum-based building materials that can significantly suppress the generation of hydrogen sulfide even when illegally dumped. As an example of utilization of this invention, the gypsum composition which enables the effective utilization of waste gypsum is mentioned.
Claims (4)
（Ａ）焼石膏１００質量部に対して、（Ｂ）アルミニウム化合物が０．８〜２０質量部の範囲で添加されてなる硫化水素発生を抑制できる石膏組成物（但し、セメントおよび／又はスラグを含むものを除く）を主成分とし、かつ、上記（Ｂ）のアルミニウム化合物がアルミニウム硫酸塩水和物［Ａｌ 2 (ＳＯ 4 ) 3 ・ｎＨ 2 Ｏ（ｎ＝６，１０，１６，１８，２７）］であることを特徴とする土壌処理用の石膏系固化材。 A gypsum-based solidifying material for soil treatment of construction soil, sludge and mud,
(A) with respect to the calcined gypsum 100 parts by weight, (B) A aluminum compound gypsum composition which can suppress an added comprising hydrogen sulfide occurs in the range of 0.8 to 20 parts by weight (however, cement and / or slag And the aluminum compound of (B) is an aluminum sulfate hydrate [Al 2 (SO 4 ) 3 .nH 2 O (n = 6, 10, 16, 18, 27)] der gypsum solidifying material Rukoto for soil treatment, wherein.
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| JP2014037330A (en) * | 2012-08-15 | 2014-02-27 | Yoshino Gypsum Co Ltd | Gypsum compositions, gypsum-based solidification materials and gypsum-based construction materials |
| AU2013303570B2 (en) | 2012-08-15 | 2015-07-23 | Yoshino Gypsum Co., Ltd. | Method for selectively inhibiting sulfate-reducing bacterium, gypsum composition capable of inhibiting proliferation of sulfate-reducing bacterium by said method, gypsum-type solidifying material, and gypsum-type building material |
| JP5969309B2 (en) * | 2012-08-15 | 2016-08-17 | 吉野石膏株式会社 | Selective control method for sulfate-reducing bacteria |
| JP6053004B2 (en) * | 2013-03-14 | 2016-12-27 | 恵和興業株式会社 | Method for producing reusable granulate from gypsum board waste |
| KR101820586B1 (en) | 2013-05-31 | 2018-01-19 | 요시노 셋고 가부시키가이샤 | Debris processing composition and debris processing method |
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| JPS57166357A (en) * | 1981-04-01 | 1982-10-13 | Kyowa Giken | Manufacture of fiber reinforced slag gypsum composite material |
| JPS60264354A (en) * | 1984-06-12 | 1985-12-27 | 山田 保 | Heat expandable gypsum hardened body |
| JPS61155242A (en) * | 1984-12-26 | 1986-07-14 | 大阪セメント株式会社 | Water-resistant fluoric anhydrous gypsum composition |
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| JPH10245256A (en) * | 1997-03-06 | 1998-09-14 | Chichibu Onoda Cement Corp | Refractory gypsum hardened product |
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