JP6675779B2 - Method for producing soil modifying material and method for modifying soil - Google Patents
Method for producing soil modifying material and method for modifying soil Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims description 101
- 239000000463 material Substances 0.000 title claims description 79
- 238000004519 manufacturing process Methods 0.000 title claims description 18
- 238000000034 method Methods 0.000 title claims description 12
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 79
- 239000000395 magnesium oxide Substances 0.000 claims description 60
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 41
- 238000010828 elution Methods 0.000 claims description 35
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 31
- 229910052731 fluorine Inorganic materials 0.000 claims description 31
- 239000011737 fluorine Substances 0.000 claims description 31
- 239000000126 substance Substances 0.000 claims description 30
- 229910052751 metal Inorganic materials 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 27
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 26
- 229910052839 forsterite Inorganic materials 0.000 claims description 14
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 14
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 9
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 7
- 239000000347 magnesium hydroxide Substances 0.000 claims description 7
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 4
- 229910021536 Zeolite Inorganic materials 0.000 claims description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 4
- 239000011790 ferrous sulphate Substances 0.000 claims description 4
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 4
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical group [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 4
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 4
- 239000003607 modifier Substances 0.000 claims description 4
- 239000010457 zeolite Substances 0.000 claims description 4
- 239000000440 bentonite Substances 0.000 claims description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
- 229910000281 calcium bentonite Inorganic materials 0.000 claims description 3
- 239000001506 calcium phosphate Substances 0.000 claims description 3
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 3
- 235000011010 calcium phosphates Nutrition 0.000 claims description 3
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims 1
- 229910001385 heavy metal Inorganic materials 0.000 description 39
- 239000010459 dolomite Substances 0.000 description 10
- 229910000514 dolomite Inorganic materials 0.000 description 10
- 239000002994 raw material Substances 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- 238000010304 firing Methods 0.000 description 5
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 5
- 239000001095 magnesium carbonate Substances 0.000 description 5
- 235000014380 magnesium carbonate Nutrition 0.000 description 5
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 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
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000011109 contamination Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000011835 investigation Methods 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 238000002407 reforming Methods 0.000 description 3
- 239000012085 test solution Substances 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 2
- 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 2
- 229910052785 arsenic Inorganic materials 0.000 description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 229910052599 brucite Inorganic materials 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000383 hazardous chemical Substances 0.000 description 2
- XBDUTCVQJHJTQZ-UHFFFAOYSA-L iron(2+) sulfate monohydrate Chemical compound O.[Fe+2].[O-]S([O-])(=O)=O XBDUTCVQJHJTQZ-UHFFFAOYSA-L 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 229910052711 selenium Inorganic materials 0.000 description 2
- 239000011669 selenium Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 241000282994 Cervidae Species 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000013373 food additive Nutrition 0.000 description 1
- 239000002778 food additive Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000000887 hydrating effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004255 ion exchange chromatography Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 229940031958 magnesium carbonate hydroxide Drugs 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- BPLYVSYSBPLDOA-GYOJGHLZSA-N n-[(2r,3r)-1,3-dihydroxyoctadecan-2-yl]tetracosanamide Chemical compound CCCCCCCCCCCCCCCCCCCCCCCC(=O)N[C@H](CO)[C@H](O)CCCCCCCCCCCCCCC BPLYVSYSBPLDOA-GYOJGHLZSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- GRLPQNLYRHEGIJ-UHFFFAOYSA-J potassium aluminium sulfate Chemical compound [Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRLPQNLYRHEGIJ-UHFFFAOYSA-J 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Description
本発明は、土壌改質材に関する。 The present invention relates to a soil modifying material.
近年、工場、事業所、産業廃棄物処理場の跡地などにおいて、土壌がカドミウム、六価クロム、シアン、水銀、セレン、鉛、ひ素、ふっ素、または、ほう素（以下、「重金属等」ともいう。）で汚染されていることが、しばしば報告されている。土壌汚染対策法においては、上述した９種類を重金属類と定めている。土壌が重金属等で汚染されると、その汚染が地下水にまで広がり、人体や穀物等にまで影響を及ぼすという安全衛生上の問題がある。また、土壌の汚染濃度が環境基準値を超える場合には、跡地をそのまま利用することができない等の問題もある。 In recent years, at sites such as factories, offices, and industrial waste disposal sites, soil has become cadmium, hexavalent chromium, cyanide, mercury, selenium, lead, arsenic, fluorine, or boron (hereinafter, also referred to as "heavy metals, etc.") .) Is often reported. The Soil Contamination Countermeasures Law stipulates the above nine types as heavy metals. When soil is contaminated with heavy metals and the like, there is a problem in safety and health that the contamination spreads to groundwater and affects human bodies and cereals. Further, when the soil contamination concentration exceeds the environmental standard value, there is another problem that the former site cannot be used as it is.
汚染土壌中の重金属等を不溶化して、これら重金属等が土壌から溶出するのを抑制するための技術が種々提案されている。
重金属等の溶出を抑制することができる不溶化材として、特許文献１には、以下の条件（ａ）〜（ｃ）をすべて満たすマグネシウム系材料からなる粉末を含むことを特徴とする不溶化材が記載されている。
（ａ）炭酸マグネシウムを主成分とする鉱物を６５０〜１，０００℃で焼成して得た酸化マグネシウムと炭酸マグネシウムとを含む焼成物を、当該焼成物の一部が水酸化マグネシウムなるように水和したものであること
（ｂ）カルシウムの酸化物換算の含有量が３．０質量％以下であること
（ｃ）１，０００℃における強熱減量率が６〜３０質量％であること
また、特許文献１には、重金属等の溶出抑制効果をより向上させる観点から、上記不溶化材が水溶性硫酸塩及び水溶性塩化物から選ばれた１種以上の添加物を含んでもよいことが記載されている。
Various techniques have been proposed for insolubilizing heavy metals and the like in contaminated soil and suppressing the elution of these heavy metals and the like from the soil.
Patent Document 1 describes, as an insolubilizing material capable of suppressing elution of heavy metals and the like, a powder comprising a magnesium-based material that satisfies all of the following conditions (a) to (c): Have been.
(A) A calcined product containing magnesium oxide and magnesium carbonate obtained by calcining a mineral mainly composed of magnesium carbonate at 650 to 1,000 ° C. is mixed with water so that a part of the calcined product is magnesium hydroxide. (B) The content in terms of calcium oxide is 3.0% by mass or less. (C) The loss on ignition at 1,000 ° C. is 6 to 30% by mass. Patent Document 1 describes that the insolubilizing material may contain one or more additives selected from water-soluble sulfates and water-soluble chlorides from the viewpoint of further improving the effect of suppressing elution of heavy metals and the like. ing.
重金属等に汚染された土壌に添加することで、土壌中の重金属等を不溶化して、重金属等の溶出を抑制することができる土壌改質材において、土壌改質材に用いられる原料の品質の差異（例えば、原料の産地が異なることに起因する差異）によって、重金属等の溶出を抑制する効果にばらつきが発生する場合があった。
そこで、本発明の目的は、重金属等の溶出を抑制する効果を、産地の違いなどによるばらつきを少なくして、確実かつ十分に得ることができる土壌改質材を提供することである。
By adding to soil contaminated with heavy metals, etc., it is possible to insolubilize heavy metals, etc. in the soil and to suppress the elution of heavy metals, etc. Due to the difference (for example, a difference caused by a difference in the place of production of the raw material), the effect of suppressing the elution of heavy metals or the like sometimes varies.
Therefore, an object of the present invention is to provide a soil modifying material that can reliably and sufficiently obtain the effect of suppressing the elution of heavy metals and the like with less variation due to differences in production areas.
本発明者は、上記課題を解決するために鋭意検討した結果、金属硫酸塩および酸化マグネシウム含有物質を含む土壌改質材であって、酸化マグネシウム含有物質中、フォルステライトの含有率が８質量％以下である土壌改質材によれば、上記目的を達成できることを見出し、本発明を完成した。
すなわち、本発明は、以下の［１］〜［８］を提供するものである。
［１］ 金属硫酸塩および酸化マグネシウム含有物質を含む土壌改質材であって、上記酸化マグネシウム含有物質中、フォルステライトの含有率が８質量％以下であることを特徴とする土壌改質材。
［２］ 上記土壌改質材中、ふっ素の含有率が０．０６質量％以下である前記［１］に記載の土壌改質材。
［３］ 上記金属硫酸塩１００質量部に対して、上記酸化マグネシウム含有物質の配合量が５〜６５質量部であり、上記酸化マグネシウム含有物質中、ふっ素の含有率が０．０４０質量％以下であり、上記金属硫酸塩中、ふっ素の含有率が０．００７０質量％以下である前記［１］又は［２］に記載の土壌改質材。
［４］ 上記酸化マグネシウム含有物質が、軽焼マグネシアである前記［１］〜［３］のいずれかに記載の土壌改質材。
［５］ 上記金属硫酸塩が、硫酸第一鉄である前記［１］〜［４］のいずれかに記載の土壌改質材。
［６］ 上記金属硫酸塩１００質量部に対して、４００質量部以下の量の助材を含み、かつ、上記助材が、半水石膏、炭酸カルシウム、ゼオライト、ポリ塩化アルミニウム、水酸化アルミニウム、珪石粉末、水酸化マグネシウム、リン酸カルシウム、およびベントナイトからなる群より選ばれる一種以上からなる前記［１］〜［５］のいずれかに記載の土壌改質材。
The inventor of the present invention has conducted intensive studies to solve the above-mentioned problems. As a result, the soil modifying material containing a metal sulfate and a magnesium oxide-containing material has a forsterite content of 8% by mass in the magnesium oxide-containing material. It has been found that the following objects can be achieved by the following soil modifying materials, and the present invention has been completed.
That is, the present invention provides the following [1] to [8].
[1] A soil modifying material containing a metal sulfate and a magnesium oxide-containing material, wherein the content of forsterite in the magnesium oxide-containing material is 8% by mass or less.
[2] The soil modifying material according to [1], wherein the content of fluorine in the soil modifying material is 0.06% by mass or less.
[3] The compounding amount of the magnesium oxide-containing substance is 5 to 65 parts by mass with respect to 100 parts by mass of the metal sulfate, and the content of fluorine in the magnesium oxide-containing material is 0.040% by mass or less. The soil modifying material according to the above [1] or [2], wherein the content of fluorine in the metal sulfate is 0.0070% by mass or less.
[4] The soil modifying material according to any one of [1] to [3], wherein the magnesium oxide-containing substance is light-burned magnesia.
[5] The soil modifying material according to any of [1] to [4], wherein the metal sulfate is ferrous sulfate.
[6] 100 parts by mass of the metal sulfate contains an auxiliary material in an amount of 400 parts by mass or less, and the auxiliary material is gypsum hemihydrate, calcium carbonate, zeolite, polyaluminum chloride, aluminum hydroxide, The soil modifying material according to any one of the above [1] to [5], comprising at least one selected from the group consisting of silica powder, magnesium hydroxide, calcium phosphate, and bentonite.
［７］ 前記［１］〜［６］のいずれかに記載の土壌改質材を用いた、土壌の改質方法であって、上記土壌が、土壌溶出量基準値を超える量で第二種特定有害物質を含むものであり、かつ、上記土壌１ｍ３に対して、上記土壌改質材を１０〜３００ｋｇの量で添加することを特徴とする土壌の改質方法。
［８］ 前記［１］〜［６］のいずれかに記載の土壌改質材を製造するための方法であって、酸化マグネシウム含有物質について、フォルステライトの含有率を測定し、フォルステライトの含有率が８質量％以下である酸化マグネシウム含有物質を選別する工程と、選別された上記酸化マグネシウム含有物質と、金属硫酸塩を混合して、上記土壌改質材を得る工程、を含むことを特徴とする土壌改質材の製造方法。
[7] A soil reforming method using the soil modifying material according to any one of [1] to [6], wherein the soil is of a second type in an amount exceeding a soil elution amount reference value. hazardous substances are those containing, and, with respect to the soil 1 m 3, reforming method soils, characterized by adding an amount of 10~300kg the soil modifier.
[8] A method for producing the soil modifying material according to any one of [1] to [6], wherein the content of forsterite is measured for the magnesium oxide-containing substance, and the content of forsterite is measured. A step of selecting a magnesium oxide-containing substance having a ratio of 8% by mass or less, and a step of mixing the selected magnesium oxide-containing substance and a metal sulfate to obtain the soil modifying material. Method for producing a soil modifying material.
本発明の土壌改質材によれば、重金属等に汚染された土壌に添加することで、土壌中の重金属等を不溶化して、重金属等の溶出を抑制する効果を、土壌改質材に用いられる原料（例えば、酸化マグネシウム含有物質である軽焼マグネシアの製造に用いられる固形原料）の産地の違いなどによるばらつきを少なくして、確実かつ十分に得ることができる。 According to the soil modifying material of the present invention, by adding to soil contaminated with heavy metals and the like, the effect of insolubilizing heavy metals and the like in the soil and suppressing the elution of heavy metals and the like is used for the soil modifying material. It is possible to reliably and sufficiently obtain a raw material (for example, a solid raw material used for producing lightly burned magnesia that is a magnesium oxide-containing substance) with less variation due to a difference in a production place.
本発明の土壌改質材は、金属硫酸塩および酸化マグネシウム含有物質を含む土壌改質材であって、酸化マグネシウム含有物質中、フォルステライトの含有率が８質量％以下のものである。
金属硫酸塩としては、例えば、硫酸第一鉄、硫酸アルミニウム、硫酸アルミニウムカリウム、硫酸アルミニウムナトリウム等が挙げられる。これらは１種を単独で、または２種以上を組み合わせて用いてもよい。中でも、経済性、安定性等の観点から、硫酸第一鉄が好ましい。
金属硫酸塩中、ふっ素の含有率は、好ましくは０．００７０質量％以下、より好ましくは０．００６０質量％以下、特に好ましくは０．００５５質量％以下である。該含有率が０．００７０質量％以下であれば、重金属等の溶出をより抑制することができる。
The soil modifying material of the present invention is a soil modifying material containing a metal sulfate and a magnesium oxide-containing substance, and has a forsterite content of 8% by mass or less in the magnesium oxide-containing substance.
Examples of the metal sulfate include ferrous sulfate, aluminum sulfate, potassium aluminum sulfate, and sodium aluminum sulfate. These may be used alone or in combination of two or more. Among them, ferrous sulfate is preferred from the viewpoints of economy, stability, and the like.
The content of fluorine in the metal sulfate is preferably 0.0070% by mass or less, more preferably 0.0060% by mass or less, and particularly preferably 0.0055% by mass or less. When the content is 0.0070% by mass or less, elution of heavy metals and the like can be further suppressed.
酸化マグネシウム含有物質としては、例えば、軽焼マグネシア、軽焼ドロマイトまたはその部分水和物を含むものが挙げられる。中でも、重金属等の溶出をより抑制することができ、不純物の含有量が少なく、かつ、入手の容易さの観点から、軽焼マグネシアが好ましい。
軽焼マグネシアとしては、例えば、炭酸マグネシウムと水酸化マグネシウムのいずれか一方または両方を含む固形原料を、好ましくは６００〜１，３００℃の温度で焼成することによって得られるものが挙げられる。
軽焼ドロマイトとしては、例えば、ドロマイトを、好ましくは８５０〜１，５００℃の温度で焼成することによって得られるものが挙げられる。
軽焼マグネシア、軽焼ドロマイトまたはその部分水和物のブレーン比表面積は、発塵の抑制、および、スラリーで添加する場合の取り扱いの容易さの観点から、好ましくは４，０００〜２０，０００ｃｍ２／ｇ、より好ましくは４，５００〜１０，０００ｃｍ２／ｇ、特に好ましくは５，０００〜７，０００ｃｍ２／ｇである。
軽焼マグネシア、軽焼ドロマイトまたはその部分水和物中の酸化マグネシウムの含有率は、重金属等の溶出を抑制する効果がより向上する観点から、好ましくは６５質量％以上、より好ましくは７５質量％以上、さらに好ましくは８０質量％以上、特に好ましくは８５質量％以上である。
Examples of the magnesium oxide-containing substance include those containing light-burned magnesia, light-burned dolomite or a partial hydrate thereof. Above all, light-burned magnesia is preferred from the viewpoints of being able to further suppress the elution of heavy metals and the like, having a low impurity content, and being easily available.
Examples of the light-burned magnesia include those obtained by firing a solid raw material containing one or both of magnesium carbonate and magnesium hydroxide, preferably at a temperature of 600 to 1,300 ° C.
Examples of the lightly fired dolomite include those obtained by firing dolomite, preferably at a temperature of 850 to 1,500 ° C.
The brane specific surface area of light-burned magnesia, light-burned dolomite or a partial hydrate thereof is preferably 4,000 to 20,000 cm 2 from the viewpoint of suppression of dust generation and ease of handling when added as a slurry. / G, more preferably from 4,500 to 10,000 cm 2 / g, particularly preferably from 5,000 to 7,000 cm 2 / g.
The content of magnesium oxide in light-burned magnesia, light-burned dolomite or its partial hydrate is preferably 65% by mass or more, more preferably 75% by mass, from the viewpoint of further improving the effect of suppressing elution of heavy metals and the like. The content is more preferably at least 80% by mass, particularly preferably at least 85% by mass.
軽焼マグネシアまたは軽焼ドロマイトの部分水和物は、軽焼マグネシアまたは軽焼ドロマイトを粉砕した後、当該粉砕物に水を添加して撹拌し混合するか、または、当該粉砕物を相対湿度８０％以上の雰囲気下に１週間以上保持して、軽焼マグネシアを部分的に水和させることによって得ることができる。 The partially hydrated light-burned magnesia or lightly-burned dolomite is obtained by grinding light-burned magnesia or lightly-burned dolomite and then adding water to the crushed material and stirring to mix the hydrated magnesia or lightly burned dolomite. % Of the magnesia can be obtained by partially hydrating the lightly-burned magnesia by keeping it in an atmosphere of not less than 1% for at least one week.
軽焼マグネシアの、固形原料、焼成温度等の製造条件の詳細は、以下のとおりである。
固形原料としては、例えば、マグネサイト、ドロマイト、ブルーサイト、及び、海水中のマグネシウム成分を消石灰等のアルカリで沈澱させて得た水酸化マグネシウム等が挙げられる。これらは、塊状物でもよいし、粉粒状物でもよい。
また、固形原料として、マグネサイト、ブルーサイトまたは水酸化マグネシウムを使用する場合の焼成温度（加熱温度）は、好ましくは６００〜１，３００℃、より好ましくは７５０〜１，１００℃、特に好ましくは８００〜１，０００℃である。該温度が６００℃以上であると、軽焼マグネシアの生成の効率がより向上する。該温度が１，３００℃以下であると、重金属等の溶出を抑制する効果がより向上する。
固形原料として、ドロマイトを使用する場合の焼成温度（加熱温度）は、好ましくは６００℃以上、７５０℃未満である。該温度が６００℃以上であると、軽焼マグネシアの生成の効率がより向上する。該温度が７５０℃未満であると、酸化カルシウムが生成しにくいため、酸化カルシウムの生成による重金属等の溶出を抑制する効果の低下が起こりにくくなる。
焼成時間（加熱時間）は、固形原料の仕込み量や粒度等によって異なるが、通常、３０分間〜５時間である。
The details of the manufacturing conditions of the light-burned magnesia, such as the solid raw material and the firing temperature, are as follows.
Examples of the solid raw material include magnesite, dolomite, brucite, and magnesium hydroxide obtained by precipitating a magnesium component in seawater with an alkali such as slaked lime. These may be lumps or powders.
When magnesite, brucite or magnesium hydroxide is used as the solid raw material, the firing temperature (heating temperature) is preferably 600 to 1,300 ° C, more preferably 750 to 1,100 ° C, and particularly preferably. 800-1,000 ° C. When the temperature is at least 600 ° C., the efficiency of producing lightly burned magnesia will be further improved. When the temperature is 1,300 ° C. or lower, the effect of suppressing elution of heavy metals and the like is further improved.
When dolomite is used as the solid raw material, the firing temperature (heating temperature) is preferably not lower than 600 ° C and lower than 750 ° C. When the temperature is at least 600 ° C., the efficiency of producing lightly burned magnesia will be further improved. When the temperature is lower than 750 ° C., calcium oxide is not easily generated, and the effect of suppressing the elution of heavy metals and the like due to the generation of calcium oxide is less likely to occur.
The baking time (heating time) varies depending on the charged amount and particle size of the solid raw material, but is usually 30 minutes to 5 hours.
酸化マグネシウム含有物質の配合量は、金属硫酸塩１００質量部に対して、好ましくは５〜６５質量部、より好ましくは１０〜６０質量部である。該量が５質量部以上であれば、重金属等の溶出をより抑制することができる。該量が６５質量部以下であれば、改質後の土壌のｐＨが高くなって、中性領域（例えば、排出基準であるｐＨ５．８〜８．６）を超えることを防ぐことができる。 The amount of the magnesium oxide-containing substance is preferably 5 to 65 parts by mass, more preferably 10 to 60 parts by mass, based on 100 parts by mass of the metal sulfate. When the amount is 5 parts by mass or more, elution of heavy metals and the like can be further suppressed. When the amount is 65 parts by mass or less, it is possible to prevent the soil pH after the modification from becoming high and exceeding the neutral region (for example, pH 5.8 to 8.6, which is a discharge standard).
酸化マグネシウム含有物質中、フォルステライトの含有率は、８質量％以下、好ましくは６質量％以下、より好ましくは４質量％以下、さらに好ましくは２質量％以下、特に好ましくは１質量％以下である。該量が８質量％を超える場合、重金属等の溶出を十分に抑制することができなくなる。
酸化マグネシウム含有物質中、ふっ素の含有率は、好ましくは０．０４０質量％以下、より好ましくは０．０３８質量％以下、特に好ましくは０．０３５質量％以下である。該含有率が０．０４０質量％以下であれば、重金属等の溶出をより抑制することができる。
In the magnesium oxide-containing substance, the content of forsterite is 8% by mass or less, preferably 6% by mass or less, more preferably 4% by mass or less, further preferably 2% by mass or less, particularly preferably 1% by mass or less. . If the amount exceeds 8% by mass, elution of heavy metals or the like cannot be sufficiently suppressed.
In the magnesium oxide-containing material, the fluorine content is preferably 0.040% by mass or less, more preferably 0.038% by mass or less, and particularly preferably 0.035% by mass or less. When the content is 0.040% by mass or less, elution of heavy metals and the like can be further suppressed.
本発明の土壌改質材中、ふっ素の含有率は、好ましくは０．０６質量％以下、より好ましくは０．０５質量％以下、特に好ましくは０．０４５質量である。該含有率が０．０６質量％以下であれば、重金属等の溶出をより抑制することができる。また、土壌改質材からのふっ素の溶出量が小さくなるため、土壌改質材が周囲の環境に悪影響を与えることを防ぐことができる。
本発明の土壌改質材のふっ素溶出量は、好ましくは０．８ｍｇ／リットル以下、より好ましくは０．７ｍｇ／リットル以下である。該量が０．８ｍｇ／リットル以下であれば、土壌改質材が周囲の環境に悪影響を与えることを防ぐことができる。なお、ふっ素溶出量は、環境庁告示第１８号「土壌溶出量調査に係る測定方法を定める件」に記載されている方法に準拠して測定することができる。
In the soil modifying material of the present invention, the fluorine content is preferably 0.06% by mass or less, more preferably 0.05% by mass or less, and particularly preferably 0.045% by mass. When the content is 0.06% by mass or less, elution of heavy metals and the like can be further suppressed. Further, since the amount of fluorine eluted from the soil modifying material is reduced, it is possible to prevent the soil modifying material from affecting the surrounding environment.
The amount of fluorine eluted from the soil modifying material of the present invention is preferably 0.8 mg / liter or less, more preferably 0.7 mg / liter or less. When the amount is 0.8 mg / liter or less, it is possible to prevent the soil modifying material from adversely affecting the surrounding environment. The fluorine elution amount can be measured in accordance with the method described in the Environment Agency Notification No. 18, "Matter to Determine Measurement Method for Soil Elution Investigation".
本発明の土壌改質材は、必要に応じて、半水石膏、炭酸カルシウム、ゼオライト、ポリ塩化アルミニウム、水酸化アルミニウム、珪石粉末、水酸化マグネシウム、リン酸カルシウム、およびベントナイトからなる群より選ばれる一種以上からなる助材を含んでもよい。
これらは、処理の対象となる土壌に含まれている重金属等の種類を考慮して適宜選択すればよい。適宜選択された助材を含むことで、重金属等の溶出をより抑制することができる。
助材の配合量は、金属硫酸塩１００質量部に対して、好ましくは４００質量部以下、より好ましくは２００質量部以下、さらに好ましくは１００質量部以下、特に好ましくは５０質量部以下である。
助材中、ふっ素の含有率は、好ましくは０．３質量％以下、より好ましくは０．２質量％以下である。該量が０．３質量％以下であれば、重金属等の溶出をより抑制することができる。
The soil modifying material of the present invention, if necessary, one or more selected from the group consisting of hemihydrate gypsum, calcium carbonate, zeolite, polyaluminum chloride, aluminum hydroxide, silica powder, magnesium hydroxide, calcium phosphate, and bentonite May be included.
These may be appropriately selected in consideration of the types of heavy metals and the like contained in the soil to be treated. By including an appropriately selected auxiliary material, elution of heavy metals and the like can be further suppressed.
The compounding amount of the auxiliary agent is preferably 400 parts by mass or less, more preferably 200 parts by mass or less, further preferably 100 parts by mass or less, particularly preferably 50 parts by mass or less based on 100 parts by mass of the metal sulfate.
In the auxiliary material, the fluorine content is preferably 0.3% by mass or less, more preferably 0.2% by mass or less. When the amount is 0.3% by mass or less, elution of heavy metals and the like can be further suppressed.
本発明の土壌改質材の製造方法としては、例えば、酸化マグネシウム含有物質について、フォルステライトの含有率を測定し、フォルステライトの含有率が８質量％以下である酸化マグネシウム含有物質を選別する工程と、選別された酸化マグネシウム含有物質と、金属硫酸塩を混合して、土壌改質材を得る工程、を含む土壌改質材の製造方法が挙げられる。
酸化マグネシウム含有物質を選別する工程において、重金属等の溶出をより抑制する観点から、酸化マグネシウム含有物質のふっ素の含有率を測定し、フォルステライトの含有率が８質量％以下で、かつ、ふっ素の含有率が０．０４０質量％以下である酸化マグネシウム含有物質を選別してもよい。
また、重金属等の溶出をより抑制する観点から、土壌改質材を得る工程の前に、金属硫酸塩について、ふっ素の含有率を測定し、ふっ素の含有率が０．００７０質量％以下である金属硫酸塩を選別する工程を設けてもよい。
なお、該製造方法において、選別の指標となる、酸化マグネシウム含有物質中のフォルステライト等の含有率や、金属硫酸塩中のふっ素の含有率の好ましい範囲は、上述した本発明の土壌改質材に含まれる、酸化マグネシウム含有物質中のフォルステライト等の含有率や、金属硫酸塩中のふっ素の含有率の好ましい範囲と同じである。
As a method for producing the soil modifying material of the present invention, for example, a step of measuring the content of forsterite in a magnesium oxide-containing substance and selecting a magnesium oxide-containing substance having a forsterite content of 8% by mass or less. And a step of mixing the selected magnesium oxide-containing substance and the metal sulfate to obtain a soil modifying material, and a method for producing a soil modifying material.
In the step of selecting the magnesium oxide-containing material, the fluorine content of the magnesium oxide-containing material is measured from the viewpoint of further suppressing elution of heavy metals and the like, and the forsterite content is 8% by mass or less, and the fluorine content is reduced. A magnesium oxide-containing substance having a content of 0.040% by mass or less may be selected.
In addition, from the viewpoint of further suppressing the elution of heavy metals and the like, before the step of obtaining a soil modifying material, the content of fluorine is measured for the metal sulfate, and the content of fluorine is 0.0070% by mass or less. A step of selecting a metal sulfate may be provided.
In the production method, the content of the forsterite and the like in the magnesium oxide-containing substance and the preferred range of the content of the fluorine in the metal sulfate as the index of selection are determined by the above-described soil modifying material of the present invention. And the preferred ranges of the content of forsterite and the like in the magnesium oxide-containing substance and the content of fluorine in the metal sulfate.
本発明の土壌改質材を用いた土壌の改質方法は、重金属等に汚染された土壌に土壌改質材を添加することで行われる。処理の対象となる重金属等に汚染された土壌とは、土壌溶出量基準値を超える量で第二種特定有害物質を含むものである。
ここで、第二種特定有害物質とは、カドミウム及びその化合物、六価クロム化合物、シアン化合物、水銀及びその化合物、セレン及びその化合物、鉛及びその化合物、ひ素及びその化合物、ふっ素及びその化合物、ほう素及びその化合物であり、その土壌溶出量基準値は、各々、０．０１ｍｇ／リットル以下、０．０５ｍｇ／リットル以下、検出されないこと、０．０００５ｍｇ／リットル以下、０．０１ｍｇ／リットル以下、０．０１ｍｇ／リットル以下、０．０１ｍｇ／リットル以下、０．８ｍｇ／リットル以下、１ｍｇ／リットル以下である。
The soil modification method using the soil modification material of the present invention is performed by adding a soil modification material to soil contaminated with heavy metals or the like. The soil contaminated with heavy metals and the like to be treated is a substance that contains a second-class specific harmful substance in an amount exceeding a soil elution amount standard value.
Here, the second type specified hazardous substances are cadmium and its compounds, hexavalent chromium compounds, cyanide compounds, mercury and its compounds, selenium and its compounds, lead and its compounds, arsenic and its compounds, fluorine and its compounds, Boron and its compounds, and their soil elution standard values are 0.01 mg / L or less, 0.05 mg / L or less, not detected, 0.0005 mg / L or less, 0.01 mg / L or less, respectively. 0.01 mg / L or less, 0.01 mg / L or less, 0.8 mg / L or less, 1 mg / L or less.
土壌改質材の添加量は、対象となる土壌の性状、施工条件、改質処理後の土壌に求められる重金属等の溶出量の上限値（基準値）等によっても異なるが、改質処理の対象となる土壌１ｍ３に対して、好ましくは１０〜３００ｋｇ、より好ましくは２０〜２００ｋｇ、特に好ましくは２５〜１００ｋｇである。該量が１０ｋｇ以上であれば、重金属等の溶出をより抑制することができる。該量が３００ｋｇ以下であれば、コストの増大を防ぐことができる。 The amount of soil modifier added depends on the properties of the target soil, construction conditions, and the upper limit (standard value) of the amount of heavy metals and other metals required for the soil after the reforming treatment. against soil 1 m 3 of interest, preferably 10～300Kg, more preferably 20 to 200 kg, particularly preferably 25～100Kg. When the amount is 10 kg or more, elution of heavy metals and the like can be further suppressed. When the amount is 300 kg or less, an increase in cost can be prevented.
土壌改質材の添加方法としては、対象となる土壌に土壌改質材を粉体のまま添加し、混合するドライ添加や、土壌改質材に水を加えてスラリーとし、該スラリーを添加し、混合するスラリー添加が挙げられる。スラリー添加の場合の水／土壌改質材の質量比は、好ましくは０．６〜１．５、より好ましくは０．８〜１．２である。
改質処理を行った後の土壌のｐＨは、処理後の土壌の用途が制限されない等の観点から、好ましくは５．８〜８．６、より好ましくは５．８〜８．０、特に好ましくは５．８〜７．５である。
As a method of adding the soil modifying agent, the soil modifying agent is added as powder to the target soil, and dry addition or mixing is performed, or water is added to the soil modifying agent to form a slurry, and the slurry is added. And adding a slurry to be mixed. The mass ratio of water / soil modifier in the case of slurry addition is preferably 0.6 to 1.5, more preferably 0.8 to 1.2.
The pH of the soil after the modification treatment is preferably 5.8 to 8.6, more preferably 5.8 to 8.0, particularly preferably from the viewpoint that the use of the soil after the treatment is not limited. Is 5.8 to 7.5.
以下、本発明を実施例により具体的に説明するが、本発明はこれらの実施例に限定されるものではない。
［使用材料］
（１）金属硫酸塩Ａ：硫酸第一鉄一水塩（食品添加用、国産化学社製）
（２）金属硫酸塩Ｂ：硫酸第一鉄一水塩（食品添加用、国産化学社製）
（３）金属硫酸塩Ｃ：硫酸アルミニウム１３〜１７水塩（特級試薬、関東化学社製）
（４）酸化マグネシウム含有物質ａ：軽焼マグネシアを粉砕したもの（酸化マグネシウムの含有率：９３質量％、ブレーン比表面積：６，１２０ｃｍ２／ｇ）
（５）酸化マグネシウム含有物質ｂ：軽焼マグネシアを粉砕したもの（酸化マグネシウムの含有率：９３質量％、ブレーン比表面積：６，２８０ｃｍ２／ｇ）
（６）酸化マグネシウム含有物質ｃ：軽焼マグネシアを粉砕したもの（酸化マグネシウムの含有率：７５質量％、ブレーン比表面積：６，４３０ｃｍ２／ｇ）
（７）助材１：炭酸カルシウム（石灰石粉末、ブレーン比表面積：４，０００ｃｍ２／ｇ、炭酸カルシウムの含有率：９８．４質量％、有燐興業社製）
（８）助材２：ゼオライト（奥多摩工業社製、商品名「タマライト」）
（９）助材３：ポリ塩化アルミニウム（大明化学工業社製 商品名「粉末パック」）
（１０）助材４：水酸化アルミニウム（試薬、関東科学社製 鹿１級）
（１１）土壌Ａ〜Ｅ：重金属等を含む土壌（各土壌に含まれる重金属等の種類や、溶出量等の詳細は、表５に記載した。）
Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to these Examples.
[Materials used]
(1) Metal sulfate A: Ferrous sulfate monohydrate (for food additives, manufactured by Kokusan Chemical Co., Ltd.)
(2) Metal sulfate B: ferrous sulfate monohydrate (for adding food, manufactured by Kokusan Chemical Co., Ltd.)
(3) Metal sulfate C: aluminum sulfate 13-17 hydrate (special grade reagent, manufactured by Kanto Chemical Co., Ltd.)
(4) Magnesium oxide-containing substance a: Lightly burned magnesia ground (magnesium oxide content: 93% by mass, Blaine specific surface area: 6,120 cm 2 / g)
(5) Magnesium oxide-containing substance b: light burned magnesia crushed (magnesium oxide content: 93% by mass, Blaine specific surface area: 6,280 cm 2 / g)
(6) Magnesium oxide-containing substance c: Lightly burned magnesia pulverized (magnesium oxide content: 75% by mass, Blaine specific surface area: 6,430 cm 2 / g)
(7) Auxiliary material 1: Calcium carbonate (limestone powder, Blaine specific surface area: 4,000 cm 2 / g, calcium carbonate content: 98.4% by mass, manufactured by Arin Kogyo Co., Ltd.)
(8) Auxiliary material 2: zeolite (trade name “Tamalite” manufactured by Okutama Kogyo Co., Ltd.)
(9) Aid 3: Polyaluminum chloride (trade name “Powder Pack” manufactured by Daimei Chemical Co., Ltd.)
(10) Auxiliary material 4: Aluminum hydroxide (reagent, deer grade 1 manufactured by Kanto Scientific Co., Ltd.)
(11) Soil AE: Soil containing heavy metals and the like (Details such as types of heavy metals and the amount of elution contained in each soil are described in Table 5.)
各使用材料のふっ素含有率を、特開２０１０−４４０３４号公報に記載の方法（具体的には、測定対象物に、反応促進剤であるＷＯ３微粉末を混合して加熱するにあたり、キャリアーガスとして非加湿の空気を用いて１，０５０℃で加熱し、発生したフッ化物を、吸収液である酢酸ナトリウム水溶液に捕集し、この水溶液中のふっ素の量を、イオンクロマトグラフ法で定量する方法）に準拠して測定した。
また、各使用材料のふっ素の溶出量を、環境庁告示第１８号「土壌溶出量調査に係る測定方法を定める件」に記載されている方法に準拠して測定した。
さらに、酸化マグネシウム含有物質ａ〜ｃのフォルステライト含有率を、粉末Ｘ線回折装置を用いた検量線法によって測定した。
各々の結果を表１〜３に示す。
The fluorine content of each of the materials used was determined by the method described in JP-A-2010-44034 (specifically, a carrier gas was used for mixing and heating WO 3 fine powder as a reaction accelerator to an object to be measured). Is heated at 1,050 ° C. using non-humidified air, and the generated fluoride is collected in an aqueous sodium acetate solution as an absorbing solution, and the amount of fluorine in the aqueous solution is quantified by ion chromatography. Method).
The amount of fluorine eluted from each of the materials used was measured in accordance with the method described in the Environment Agency Notification No. 18, "Determination of Measurement Method for Investigation of Soil Elution".
Further, the forsterite content of the magnesium oxide-containing substances a to c was measured by a calibration curve method using a powder X-ray diffractometer.
Tables 1 to 3 show the results.
［実施例１］
上記材料を表４に示す配合で混合して、土壌改質材を得た。得られた土壌改質材のふっ素含有率およびふっ素溶出量を、使用材料と同様にして測定した。また、ふっ素溶出量測定用の検液のｐＨを、ｐＨメーター（堀場製作所社製、商品名「Ｆ−５２」）およびｐＨ電極（堀場製作所社製、商品名「９６１５−１０Ｄ」）を用いて測定した。
次いで、表６に示す添加量の土壌改質材と、表５〜６に示す土壌１ｍ３を、ホバートミキサを用いて３分間混合した。得られた混合物に対して、２０℃の条件下で７日間の封緘養生を行った。養生後の土壌に対して、環境省告示第１８号「土壌溶出量調査に係る測定方法を定める件」に記載されている方法に準拠して、重金属等（鉛）の溶出試験を行い、重金属等（鉛）の溶出量を測定した。また、重金属等（鉛）溶出量測定用の検液のｐＨを、ふっ素溶出量測定用の検液のｐＨと同様にして測定した。
[Example 1]
The above materials were mixed according to the formulation shown in Table 4 to obtain a soil modifying material. The fluorine content and the fluorine elution amount of the obtained soil modifying material were measured in the same manner as the material used. The pH of the test solution for measuring the amount of fluorine eluted was measured using a pH meter (trade name “F-52” manufactured by Horiba, Ltd.) and a pH electrode (trade name “9615-10D” manufactured by Horiba, Ltd.). It was measured.
Next, the soil modifying material of the addition amount shown in Table 6 and 1 m 3 of soil shown in Tables 5 to 6 were mixed for 3 minutes using a Hobart mixer. The obtained mixture was sealed and cured at 20 ° C. for 7 days. Based on the method described in the Ministry of the Environment Notification No. 18, “Stipulation of Measurement Methods for Soil Leaching Investigation”, the leached test for heavy metals (lead) was performed on the soil after curing. The amount of eluted (lead) was measured. Further, the pH of the test solution for measuring the elution amount of heavy metals and the like (lead) was measured in the same manner as the pH of the test solution for measuring the elution amount of fluorine.
［実施例２〜６］
実施例１と同様にして、土壌改質材のふっ素含有率等の測定、及び、養生後の土壌の重金属等の溶出量等の測定を行った。
[Examples 2 to 6]
In the same manner as in Example 1, the measurement of the fluorine content and the like of the soil modifying material and the measurement of the elution amount of heavy metals and the like from the soil after curing were performed.
［比較例１］
実施例１と同様にして、土壌改質材を作製し、得られた土壌改質材のふっ素含有率等の測定を行った。
各々の結果を表４、６に示す。
[Comparative Example 1]
In the same manner as in Example 1, a soil modifying material was prepared, and the obtained soil modifying material was measured for the fluorine content and the like.
Tables 4 and 6 show the results.
表６から、本発明の土壌改質材（実施例１〜６）によれば、土壌の重金属等の溶出量を環境基準値以下に抑えうることがわかる。
一方、表４から、比較例１の土壌改質材のふっ素溶出量が、環境基準値を超えていることがわかる。
Table 6 shows that the soil modifying material of the present invention (Examples 1 to 6) can suppress the elution amount of heavy metals and the like from the soil to an environmental standard value or less.
On the other hand, from Table 4, it can be seen that the fluorine elution amount of the soil modifying material of Comparative Example 1 exceeds the environmental standard value.
Claims (7)
上記酸化マグネシウム含有物質について、フォルステライトの含有率を測定し、フォルステライトの含有率が６質量％以下である酸化マグネシウム含有物質を選別する工程と、
選別された上記酸化マグネシウム含有物質と、上記金属硫酸塩を混合して、上記土壌改質材を得る工程、
を含むことを特徴とする土壌改質材の製造方法。 A method for producing a soil modifying material comprising a metal sulfate and a magnesium oxide-containing substance ,
For the magnesium oxide-containing substance, a step of measuring the content of forsterite and selecting a magnesium oxide-containing substance having a forsterite content of 6 % by mass or less,
And sorted the magnesium oxide-containing substances, a mixture of the metal sulfate, to obtain the soil modifiers,
A method for producing a soil modifying material, comprising:
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