JP2005021732A - Arsenic and / or selenium collector - Google Patents
Arsenic and / or selenium collector Download PDFInfo
- Publication number
- JP2005021732A JP2005021732A JP2003186761A JP2003186761A JP2005021732A JP 2005021732 A JP2005021732 A JP 2005021732A JP 2003186761 A JP2003186761 A JP 2003186761A JP 2003186761 A JP2003186761 A JP 2003186761A JP 2005021732 A JP2005021732 A JP 2005021732A
- Authority
- JP
- Japan
- Prior art keywords
- selenium
- arsenic
- calcium aluminate
- incineration ash
- present
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000011669 selenium Substances 0.000 title claims abstract description 44
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 229910052711 selenium Inorganic materials 0.000 title claims abstract description 42
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 39
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 39
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 23
- 239000002689 soil Substances 0.000 claims abstract description 8
- 238000004017 vitrification Methods 0.000 claims description 15
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 239000002516 radical scavenger Substances 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract description 18
- 239000010802 sludge Substances 0.000 abstract description 8
- 238000004056 waste incineration Methods 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 239000003905 agrochemical Substances 0.000 abstract description 3
- 239000003814 drug Substances 0.000 abstract description 3
- 239000000975 dye Substances 0.000 abstract description 3
- 239000011521 glass Substances 0.000 abstract description 3
- 239000004009 herbicide Substances 0.000 abstract description 3
- 239000002917 insecticide Substances 0.000 abstract description 3
- 108091008695 photoreceptors Proteins 0.000 abstract description 3
- 239000011814 protection agent Substances 0.000 abstract description 3
- 239000003128 rodenticide Substances 0.000 abstract description 3
- 239000004065 semiconductor Substances 0.000 abstract description 3
- 231100000331 toxic Toxicity 0.000 abstract description 3
- 230000002588 toxic effect Effects 0.000 abstract description 3
- 239000000383 hazardous chemical Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 13
- 239000004568 cement Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 238000001514 detection method Methods 0.000 description 9
- 238000004993 emission spectroscopy Methods 0.000 description 9
- 239000002956 ash Substances 0.000 description 8
- 239000000292 calcium oxide Substances 0.000 description 7
- 235000012255 calcium oxide Nutrition 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 239000011398 Portland cement Substances 0.000 description 4
- 150000001495 arsenic compounds Chemical class 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 229910001385 heavy metal Inorganic materials 0.000 description 4
- 230000001771 impaired effect Effects 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- -1 alkaline earth metal sulfate Chemical class 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 229910001882 dioxygen Inorganic materials 0.000 description 3
- 238000010828 elution Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000010440 gypsum Substances 0.000 description 3
- 229910052602 gypsum Inorganic materials 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 231100000647 material safety data sheet Toxicity 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000012086 standard solution Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 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 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000013065 commercial product Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- FGRVOLIFQGXPCT-UHFFFAOYSA-L dipotassium;dioxido-oxo-sulfanylidene-$l^{6}-sulfane Chemical compound [K+].[K+].[O-]S([O-])(=O)=S FGRVOLIFQGXPCT-UHFFFAOYSA-L 0.000 description 2
- 229940093920 gynecological arsenic compound Drugs 0.000 description 2
- 159000000014 iron salts Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 239000010801 sewage sludge Substances 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 2
- 235000019345 sodium thiosulphate Nutrition 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000003440 toxic substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- DJHGAFSJWGLOIV-UHFFFAOYSA-N Arsenic acid Chemical compound O[As](O)(O)=O DJHGAFSJWGLOIV-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 206010061218 Inflammation Diseases 0.000 description 1
- 229910021577 Iron(II) chloride Inorganic materials 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 208000025865 Ulcer Diseases 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- ULGYAEQHFNJYML-UHFFFAOYSA-N [AlH3].[Ca] Chemical compound [AlH3].[Ca] ULGYAEQHFNJYML-UHFFFAOYSA-N 0.000 description 1
- 229910001508 alkali metal halide Inorganic materials 0.000 description 1
- 150000008045 alkali metal halides Chemical class 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 229910052936 alkali metal sulfate Inorganic materials 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 229910001615 alkaline earth metal halide Inorganic materials 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- UYJXRRSPUVSSMN-UHFFFAOYSA-P ammonium sulfide Chemical compound [NH4+].[NH4+].[S-2] UYJXRRSPUVSSMN-UHFFFAOYSA-P 0.000 description 1
- 229910052586 apatite Inorganic materials 0.000 description 1
- 229940000488 arsenic acid Drugs 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000010260 calcium hydrogen sulphite Nutrition 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
- JGIATAMCQXIDNZ-UHFFFAOYSA-N calcium sulfide Chemical compound [Ca]=S JGIATAMCQXIDNZ-UHFFFAOYSA-N 0.000 description 1
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 239000013522 chelant Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- 229910001648 diaspore Inorganic materials 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical class O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- SDIXRDNYIMOKSG-UHFFFAOYSA-L disodium methyl arsenate Chemical compound [Na+].[Na+].C[As]([O-])([O-])=O SDIXRDNYIMOKSG-UHFFFAOYSA-L 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000003100 immobilizing effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 231100000862 numbness Toxicity 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical class [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 description 1
- 229940097322 potassium arsenite Drugs 0.000 description 1
- DJEHXEMURTVAOE-UHFFFAOYSA-M potassium bisulfite Chemical compound [K+].OS([O-])=O DJEHXEMURTVAOE-UHFFFAOYSA-M 0.000 description 1
- 229940099427 potassium bisulfite Drugs 0.000 description 1
- 235000010259 potassium hydrogen sulphite Nutrition 0.000 description 1
- DPLVEEXVKBWGHE-UHFFFAOYSA-N potassium sulfide Chemical compound [S-2].[K+].[K+] DPLVEEXVKBWGHE-UHFFFAOYSA-N 0.000 description 1
- BHZRJJOHZFYXTO-UHFFFAOYSA-L potassium sulfite Chemical compound [K+].[K+].[O-]S([O-])=O BHZRJJOHZFYXTO-UHFFFAOYSA-L 0.000 description 1
- 235000019252 potassium sulphite Nutrition 0.000 description 1
- HEQWEGCSZXMIJQ-UHFFFAOYSA-M potassium;oxoarsinite Chemical compound [K+].[O-][As]=O HEQWEGCSZXMIJQ-UHFFFAOYSA-M 0.000 description 1
- 238000000634 powder X-ray diffraction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229940000207 selenious acid Drugs 0.000 description 1
- MCAHWIHFGHIESP-UHFFFAOYSA-N selenous acid Chemical compound O[Se](O)=O MCAHWIHFGHIESP-UHFFFAOYSA-N 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- YALHCTUQSQRCSX-UHFFFAOYSA-N sulfane sulfuric acid Chemical compound S.OS(O)(=O)=O YALHCTUQSQRCSX-UHFFFAOYSA-N 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 150000004764 thiosulfuric acid derivatives Chemical class 0.000 description 1
- 231100000397 ulcer Toxicity 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
【課題】ヒ素とセレンの捕集に優れ、両者が共存した場合でも、同時に捕集できる有害金属捕集材を提供する。
【解決手段】カルシウムアルミネートを含有してなるヒ素及び／又はセレン捕集材。本発明の有害物質捕集材は、カルシウムアルミネートがヒ素とセレンの捕集に優れ、両者が共存した場合でも、同時に、短時間で捕集できるという特徴を有する。本発明の有害物質捕集材は、半導体、ガラス染料、防蟻剤、医薬品、農薬、化学兵器、殺虫剤、殺鼠剤、除草剤、複写機感光体等の産業から発生する、ヒ素及び／又はセレンを含有する廃棄物、汚泥、汚泥焼却灰、都市ゴミ焼却灰、土壌からのセレンの溶出を抑える用途に有用である。
【選択図】 なしDisclosed is a toxic metal trapping material that is excellent in trapping arsenic and selenium and that can simultaneously trap even when both coexist.
An arsenic and / or selenium collector containing calcium aluminate. The harmful substance collection material of the present invention is characterized in that calcium aluminate is excellent in collecting arsenic and selenium, and can be collected simultaneously in a short time even when both coexist. The hazardous substance collecting material of the present invention includes arsenic and / or selenium generated from industries such as semiconductors, glass dyes, ant protection agents, pharmaceuticals, agricultural chemicals, chemical weapons, insecticides, rodenticides, herbicides, photocopier photoreceptors, etc. It is useful for applications that contain selenium from waste, sludge, sludge incineration ash, municipal waste incineration ash, and soil.
[Selection figure] None
Description
【０００１】
【発明の属する技術分野】
本発明は、ヒ素及び／又はセレンを含有する廃棄物、汚泥、汚泥焼却灰、都市ゴミ焼却灰、土壌からのヒ素及びセレンの溶出を抑える捕集材に関する。
【０００２】
【従来の技術と課題】
ヒ素及びセレンは、半導体、ガラス染料、防蟻剤、医薬品、農薬、化学兵器、殺虫剤、殺鼠剤、除草剤、複写機感光体などの製造に用いられており、優れた特性を発揮する一方で、きわめて高い毒性を示すことが知られている。これらの産業の廃棄物や、汚泥、汚泥焼却灰、都市ゴミ焼却灰、土壌からのヒ素やセレンの溶出が問題となっている。
【０００３】
ヒ素（ａｒｓｅｎｉｃ、Ａｓ）を含む化合物の多くは毒物であり、ごく微量であっても人体には有害であり、手足のしびれ、炎症、潰瘍の原因等となることが知られている。また、ヒ素化合物を容器に入れて土中に埋没させて廃棄した場合、容器が腐食又は破損し、雨水にヒ素化合物が溶出して井戸水中に流出すると、広範囲にわたって健康被害が発生する。また、ヒ素化合物の不法投棄や不正使用は社会を脅かす犯罪に悪用される原因となることがある。
【０００４】
したがって、ヒ素化合物は劇毒物取締法、環境基本法、労働安全衛生法、ＰＲＴＲ法（特定第一種化学物質Ｎｏ．２５２）など、多様な法律により厳しく規制を受けており（非特許文献１〜２等参照）、その取扱い及び廃棄は慎重かつ確実に行う必要があるとされている。
【０００５】
また、セレン（Ｓｅｌｅｎｉｕｍ、Ｓｅ）を含む化合物も同様に急性毒性があり、人体に非常に有害なため、労働安全衛生法、毒物及び劇物取締法、ＰＲＴＲ法（第一種指定化学物質Ｎｏ．１７８）等で厳しく規制されており、環境基準も日本産業衛生学会勧告値で０．０１ｍｇ／ｍ３未満と厳しく定められており、その取扱い及び廃棄は慎重かつ確実に行う必要があり（非特許文献３等参照）、廃棄する際には何らかの無害化処理が必要である。
【０００６】
これらの化合物の無害化処理の最も一般的な方法は、他の重金属と同様にセメント系材料により固定化する方法である。しかし、セメントはその硬化に伴って重金属を固定化するため、ヒ素、セレンについても硬化するまでの若材齢では効果が期待できない。また、ヒ素やセレンが硬化体中に物理的に閉じ込められることにより溶出が低減されるだけあって、ヒ素、セレンの固定化に特別優れる訳ではなく、ヒ素、セレンの溶出低減方法としては、その安全性が疑問視されることがあった。
【０００７】
そこで本発明者らは上記課題を鑑み種々検討した結果、カルシウムアルミネートがヒ素及び／又はセレンの固定化に優れることを見出し、本発明を完成させるに至った。
【０００８】
【非特許文献１】和光純薬工業株式会社編 製品安全データシート（ＣＤ−ＲＯＭ版） Ｎｏ．０１−０４６７（１）「６０％ひ酸溶液」 作成日２０００年７月３０日
【非特許文献２】和光純薬工業株式会社編 製品安全データシート（ＣＤ−ＲＯＭ版） Ｎｏ．１６−０３２５（１）「亜ひ酸カリウム」 作成日２０００年７月３０日
【非特許文献３】和光純薬工業株式会社編 製品安全データシート（ＣＤ−ＲＯＭ版） Ｎｏ．１９−００３３（１）「亜セレン酸」 作成日２０００年７月３０日
【０００９】
【課題を解決するための手段】
即ち、本発明はカルシウムアルミネートを含有することを特徴とするヒ素及び／又はセレンの捕集材であり、ＣａＯ／Ａｌ２Ｏ３モル比が１〜３であることを特徴とするヒ素及び／又はセレンの該捕集材であり、カルシウムアルミネートのガラス化率が５０％以上であることを特徴とするヒ素及び／又はセレンの該捕集材であり、ＳＯ３／Ａｌ２Ｏ３モル比が１．０未満であることを特徴とするヒ素及び／又はセレンの該捕集材であり、カルシウムアルミネートが酸化雰囲気で合成されることを特徴とするヒ素及び／又はセレンの該捕集材であり、ヒ素及び／又はセレンの該捕集材を用いることを特徴とする土壌改良方法である。
【００１０】
【発明の実施の形態】
以下、本発明を詳細に説明する。
【００１１】
本発明で使用するカルシウムアルミネートとは、ＣａＯを含む原料とＡｌ２Ｏ３を含む原料を混合して、キルンや電気炉で熱処理をして得られる水和活性を有する物質の総称であって、ＣａＯをＣ、Ａｌ２Ｏ３をＡと標記するとＣＡ，Ｃ１２Ａ７，Ｃ３Ａなどの化学式で表記される化合物であり、ＣａＯ及びＡｌ２Ｏ３の一部がアルカリ金属酸化物、アルカリ土類金属酸化物、アルカリ金属ハロゲン化物、アルカリ土類金属ハロゲン化物、アルカリ金属硫酸塩、及びアルカリ土類金属硫酸塩等で置換固溶された物質でもよい。
【００１２】
カルシウムアルミネートを製造するためのＣａＯ原料としては生石灰（ＣａＯ）、消石灰（Ｃａ（ＯＨ）２）、石灰石（ＣａＣＯ３）、Ａｌ２Ｏ３原料としては、アルミナ、ボーキサイト、ダイアスポア、長石、粘土などを用いることができる。
【００１３】
また、上記の原料中にはＭｇＯ、Ｆｅ２Ｏ３、ＴｉＯ２、ＳｉＯ２等の不純物が含有されているが、本発明の効果を阻害しない範囲であれば、これらの化合物を含有していてもよい。カルシウムアルミネートは、これら原料を所定の割合で配合した後、ロータリーキルンや電気炉、高周波炉で溶融し、徐冷して結晶質、または急冷却して非晶質化（ガラス化ともいう）することによって製造される。
【００１４】
カルシウムアルミネートの鉱物形態としては結晶質、非晶質のいずれであっても良い。ただし、非晶質の方がヒ素及び／又はセレン捕集効果がより大きく、ガラス化率は２５％以上が好ましく、５０％以上がより好ましく、７５％以上が最も好ましい。
【００１５】
本発明でいうガラス化率は、下記の式で求められる。ここで、Ｓは粉末Ｘ線回折法により求められるカルシウムアルミネートのＣＡ相，Ｃ１２Ａ７相，Ｃ３Ａ相の各結晶相のメインピークの面積強度の合計であり、Ｓ０はカルシウムアルミネートを１，０００℃で３時間加熱し、その後、５℃／分の冷却速度で冷却したカルシウムアルミネートのＣＡ相，Ｃ１２Ａ７相，Ｃ３Ａ相のメインピークの面積強度の合計を表す。
ガラス化率 Ｘ（％）＝（１−Ｓ／Ｓ０）×１００
【００１６】
カルシウムアルミネートの粉末度は特に限定されるものではないが、ブレーン比表面積で１，０００ｃｍ２／ｇ以上が好ましく２，０００ｃｍ２／ｇ以上がより好ましく、４，０００〜８，０００ｃｍ２／ｇがより好ましい。１，０００ｃｍ２／ｇ未満ではヒ素及び／又はセレンの捕集性能が損なわれる場合があり、８，０００ｃｍ２／ｇを超えると、過剰な粉砕動力が必要となるため、不経済である。
【００１７】
本発明の捕集材では、捕集材及び施工対象となる材料に含まれる硫酸態イオウの合計のモル数ＳＯ３とカルシウムアルミネート中のアルミニウムの酸化物Ａｌ２Ｏ３換算のモル比であるＳＯ３／Ａｌ２Ｏ３モル比が１．０未満であることが好ましい。ＳＯ３／Ａｌ２Ｏ３モル比が１．０を超えるとヒ素及び／又はセレンの捕集性能が低下する恐れがある。
【００１８】
また、本発明のカルシウムアルミネートの製造においては、酸化雰囲気、すなわち酸素ガス濃度が空気中よりも多く、酸素ガス濃度２０％以上であることが好ましい。酸素ガス濃度２０％未満でカルシウムアルミネートを焼成すると、ヒ素及び／又はセレンの捕集性能が不足することがある。
【００１９】
本発明の捕集材には、本発明の目的を損ねない範囲で、従来セメント系固化材に使用されている成分、具体的には普通、早強、超早強等の各種ポルトランドセメント、高炉セメント、シリカセメント、フライアッシュセメント、ジェットセメント等のセメント類、水砕スラグや高炉徐冷スラグなどのスラグ類、二水セッコウ、半水セッコウ及び無水セッコウなどの石膏類、消石灰などの石灰類、カオリン、マイカ、ベントナイトなどの粘土化合物類、ゼオライトやアパタイトなどの金属イオン交換体類、キレート化合物等を併用することが可能である。
【００２０】
本発明の効果を損なわない範囲で還元剤を併用することは、重金属の捕集効果を高める観点から好ましい。還元剤としては、塩化鉄（ＩＩ）等の２価の鉄塩などの２価の鉄塩、亜硫酸ナトリウム、亜硫酸カリウム、亜硫酸カルシウム等の亜硫酸塩、亜硫酸水素ナトリウムや亜硫酸水素カリウムなどの亜硫酸水素塩、硫化ナトリウム、硫化カリウム、硫化カルシウム、及び硫化アンモニウム等の硫化物、チオ硫酸ナトリウムやチオ硫酸カリウムなどのチオ硫酸塩、二酸化硫黄や硫黄、ならびに泥炭や亜炭などがあり、これらのうち少量使用で重金属の固定化率が高いチオ硫酸ナトリウム、チオ硫酸カリウムの使用が好ましい。
【００２１】
【実施例】
実験例１
炭酸カルシウム及びアルミナを所定の割合で混合し、電気炉を用い、空気に酸素を添加した雰囲気下、１，６００℃で２時間加熱後、カルシウムアルミネートａ〜ｃは送風しながら強制的に空冷、カルシウムアルミネートｄは炉冷（徐冷）し、表１に示す種類のカルシウムアルミネートを合成した。
【００２２】
このカルシウムアルミネートをブレーン比表面積４，０００ｃｍ２／ｇに粉砕し、ヒ素及び／又はセレン捕集材とした。セレン１，０００ｍｇ／リットル標準溶液を２０倍に希釈し、セレン５０ｍｇ／リットル溶液を調製した。調製した溶液５０ｍｌを容器に分取し、表１に示すサンプルを２ｇ添加して密栓した。その後２０℃室内の振とう機上で反応させ、材齢５分、１日で固液分離し、液相中のセレン残存濃度を測定した。結果を表１に示す。なお普通ポルトランドセメントを比較対象とした。
【００２３】
＜使用材料＞
カルシウムアルミネートａ：Ｃ３Ａ組成、結晶質（ガラス化率０％）
カルシウムアルミネートｂ：Ｃ１２Ａ７組成、結晶質（ガラス化率０％）
カルシウムアルミネートｃ：ＣＡ組成、結晶質（ガラス化率０％）
カルシウムアルミネートｄ：Ｃ１２Ａ７組成、ガラス化率１００％
セメント：市販品、普通ポルトランドセメント
セレン： Ｓｅ標準溶液、１，０００ｍｇ／リットル、関東化学社製
【００２４】
＜試験方法＞
セレン濃度：液相中のセレン濃度をＩＣＰ発光分光分析装置を用いて定量。
【００２５】
【表１】
【００２６】
実験例２
カルシウムアルミネートｂ、ｄと、ガラス化率が異なるＣ１２Ａ７組成のカルシウムアルミネートを用い、冷却速度を変えてガラス化率を表２に示すように変化させたこと以外は、実験例１と同様に行った。結果を表２に示す。
【００２７】
＜使用材料＞
カルシウムアルミネートｅ：Ｃ１２Ａ７組成、ガラス化率２５％
カルシウムアルミネートｆ：Ｃ１２Ａ７組成、ガラス化率５０％
カルシウムアルミネートｇ：Ｃ１２Ａ７組成、ガラス化率７５％
【００２８】
【表２】
【００２９】
実験例３
Ｃ１２Ａ７組成のカルシウムアルミネートの粉末度を表３に示すように変化させたこと以外は実験例１と同様に行った。結果を表３に示す。
【００３０】
【表３】
【００３１】
実験例４
カルシウムアルミネートｄ２ｇに半水石膏を添加し、表４に示すＳＯ３／Ａｌ２Ｏ３モル比となるようにしたこと以外は実験例１と同様に行った。結果を表４に示す。
【００３２】
＜使用材料＞
半水石膏：関東化学製、試薬１級
【００３３】
【表４】
【００３４】
実験例５
有害物質をヒ素としたこと以外は、実験例１と同様に行った。結果を表５に示す。
【００３５】
＜使用材料＞
ヒ素： Ａｓ標準溶液、１，０００ｍｇ／リットル、関東化学社製
【００３６】
＜試験方法＞
ヒ素濃度：液相中のヒ素濃度をＩＣＰ発光分光分析装置を用いて定量。
【００３７】
【表５】
【００３８】
実験例６
有害物質をヒ素としたこと以外は、実験例２と同様に行った。結果を表６に示す。
【００３９】
【表６】
【００４０】
実験例７
有害物質をヒ素としたこと以外は、実験例３と同様に行った。結果を表７に示す。
【００４１】
【表７】
【００４２】
実験例８
有害物質をヒ素としたこと以外は、実験例４と同様に行った。結果を表８に示す。
【００４３】
【表８】
【００４４】
実験例９
下水汚泥焼却灰１００ｇに対し、カルシウムアルミネートｄを１０ｇと水１，０００ｍｌを配合し、環境庁告示第４６号「土壌の環境に係る環境基準について」に準拠して、ヒ素とセレンの溶出試験を実施した。結果を表５に併記する。なお、カルシウムアルミネートを使用しなかった場合、セメントを使用した場合、還元剤を使用した場合の結果も併記する。
【００４５】
＜使用材料＞
下水汚泥焼却灰：東京都、新河岸処理場品
セメント：市販普通ポルトランドセメント
還元剤：硫酸第一鉄、市販品
【００４６】
【表９】
【００４７】
【発明の効果】
本発明の有害物質捕集材は、カルシウムアルミネートがヒ素とセレンの捕集に優れ、両者が共存した場合でも、同時に、短時間で捕集できるという特徴を有する。本発明の有害物質捕集材は、半導体、ガラス染料、防蟻剤、医薬品、農薬、化学兵器、殺虫剤、殺鼠剤、除草剤、複写機感光体等の産業から発生する、ヒ素及び／又はセレンを含有する廃棄物、汚泥、汚泥焼却灰、都市ゴミ焼却灰、土壌からのセレンの溶出を抑える用途に有用である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waste material containing arsenic and / or selenium, sludge, sludge incineration ash, municipal waste incineration ash, and a trapping material that suppresses arsenic and selenium elution from soil.
[0002]
[Prior art and issues]
Arsenic and selenium are used in the manufacture of semiconductors, glass dyes, ant protection agents, pharmaceuticals, agricultural chemicals, chemical weapons, insecticides, rodenticides, herbicides, photocopier photoreceptors, etc. It is known to exhibit extremely high toxicity. Wastes from these industries, sludge, sludge incineration ash, municipal waste incineration ash, and elution of arsenic and selenium from soil are problematic.
[0003]
Many of the compounds containing arsenic (Assenic, As) are toxic substances that are harmful to the human body even in very small amounts, and are known to cause numbness in the limbs, inflammation, ulcers, and the like. In addition, when an arsenic compound is placed in a container and buried in the soil and discarded, the container is corroded or damaged, and when the arsenic compound is eluted into rainwater and flows into well water, health damage occurs over a wide area. In addition, illegal dumping and unauthorized use of arsenic compounds can be abused for crimes that threaten society.
[0004]
Therefore, arsenic compounds are severely regulated by various laws such as the Dangerous Toxic Substances Control Law, the Basic Environment Law, the Industrial Safety and Health Law, and the PRTR Law (Specified Class I Chemical Substance No. 252) (Non-Patent Documents 1 and 2). It is said that it is necessary to handle and dispose of it carefully and reliably.
[0005]
Similarly, compounds containing selenium (Selenium, Se) are also acutely toxic and very harmful to the human body. Therefore, the Industrial Safety and Health Act, the Toxic and Deleterious Substances Control Law, the PRTR Law (Class 1 Designated Chemical Substance No. 178), etc., and the environmental standard is strictly set to be less than 0.01 mg / m 3 as recommended by the Japan Society for Occupational Health, and its handling and disposal must be carried out carefully and reliably (non-patent) (Refer to Literature 3 etc.), and some kind of detoxification treatment is necessary when it is discarded.
[0006]
The most common method of detoxifying these compounds is a method of fixing with a cementitious material as with other heavy metals. However, since cement immobilizes heavy metals as it hardens, arsenic and selenium cannot be expected to be effective at younger ages until they harden. In addition, arsenic and selenium are only confined in the cured body to reduce elution, and are not particularly excellent in immobilization of arsenic and selenium. Safety was sometimes questioned.
[0007]
Thus, as a result of various studies in view of the above problems, the present inventors have found that calcium aluminate is excellent in immobilizing arsenic and / or selenium, and have completed the present invention.
[0008]
[Non-Patent Document 1] Wako Pure Chemical Industries, Ltd. Product Safety Data Sheet (CD-ROM version) 01-0467 (1) “60% arsenic acid solution” Date of creation July 30, 2000 [Non-patent Document 2] Wako Pure Chemical Industries, Ltd. Product Safety Data Sheet (CD-ROM version) 16-0325 (1) “Potassium arsenite” Date of creation July 30, 2000 [Non-patent Document 3] Wako Pure Chemical Industries, Ltd. Product Safety Data Sheet (CD-ROM version) 19-0033 (1) "Selenious acid" Date of creation July 30, 2000
[Means for Solving the Problems]
That is, the present invention is a arsenic and / or selenium scavenger characterized by containing calcium aluminate, wherein the molar ratio of CaO / Al 2 O 3 is 1-3. Or the selenium scavenger, the vitrification rate of calcium aluminate is 50% or more, and the arsenic and / or selenium scavenger, SO 3 / Al 2 O 3 molar ratio The arsenic and / or selenium scavenger, wherein calcium aluminate is synthesized in an oxidizing atmosphere. The soil improvement method is characterized by using the arsenic and / or selenium trapping material.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
[0011]
The calcium aluminate used in the present invention is a general term for substances having hydration activity obtained by mixing a raw material containing CaO and a raw material containing Al 2 O 3 and heat-treating them in a kiln or an electric furnace. , CaO is C, and Al 2 O 3 is A, which is a compound represented by a chemical formula such as CA, C 12 A 7 , C 3 A, etc., and a part of CaO and Al 2 O 3 is an alkali metal oxide, A substance substituted and dissolved in an alkaline earth metal oxide, an alkali metal halide, an alkaline earth metal halide, an alkali metal sulfate, an alkaline earth metal sulfate, or the like may be used.
[0012]
Examples of the CaO raw material for producing calcium aluminate include quick lime (CaO), slaked lime (Ca (OH) 2 ), limestone (CaCO 3 ), and Al 2 O 3 raw materials such as alumina, bauxite, diaspore, feldspar, and clay. Can be used.
[0013]
Further, the above raw materials contain impurities such as MgO, Fe 2 O 3 , TiO 2 , and SiO 2 , but these compounds are contained as long as the effects of the present invention are not impaired. Also good. Calcium aluminate blends these raw materials at a predetermined ratio, then melts them in a rotary kiln, electric furnace, or high-frequency furnace, slowly cools them to become crystalline, or rapidly cools to become amorphous (also called vitrification). Manufactured by.
[0014]
The mineral form of calcium aluminate may be crystalline or amorphous. However, the amorphous one has a larger arsenic and / or selenium collection effect, and the vitrification rate is preferably 25% or more, more preferably 50% or more, and most preferably 75% or more.
[0015]
The vitrification rate as used in the field of this invention is calculated | required by the following formula. Here, S is the sum of the area intensities of the main peaks of the CA, C 12 A 7 and C 3 A phases of calcium aluminate obtained by powder X-ray diffraction, and S 0 is calcium aluminum. The total intensity of the main peaks of the CA phase, C 12 A 7 phase, and C 3 A phase of calcium aluminate was heated at 1,000 ° C. for 3 hours and then cooled at a cooling rate of 5 ° C./min. To express.
Vitrification rate X (%) = (1-S / S 0 ) × 100
[0016]
Calcium fineness of aluminate is not particularly limited, and more preferably 1,000 cm 2 / g or more preferably 2,000 cm 2 / g in Blaine specific surface area, 4,000~8,000cm 2 / g Is more preferable. If it is less than 1,000 cm 2 / g, the collection performance of arsenic and / or selenium may be impaired. If it exceeds 8,000 cm 2 / g, excessive grinding power is required, which is uneconomical.
[0017]
In the collection material of the present invention, the total molar number SO 3 of sulfate sulfur contained in the collection material and the material to be constructed is a molar ratio in terms of oxide Al 2 O 3 of aluminum in calcium aluminate. It is preferable that the SO 3 / Al 2 O 3 molar ratio is less than 1.0. If the SO 3 / Al 2 O 3 molar ratio exceeds 1.0, the arsenic and / or selenium collection performance may be reduced.
[0018]
In the production of the calcium aluminate of the present invention, it is preferable that the oxidizing atmosphere, that is, the oxygen gas concentration is higher than that in the air and the oxygen gas concentration is 20% or more. When calcium aluminate is fired at an oxygen gas concentration of less than 20%, the arsenic and / or selenium collection performance may be insufficient.
[0019]
The collection material of the present invention includes components conventionally used in cement-based solidified materials, specifically various portland cements such as normal, early strength, and ultra-early strength, and blast furnaces, as long as the object of the present invention is not impaired. Cement such as cement, silica cement, fly ash cement, jet cement, slag such as granulated slag and blast furnace slow-cooled slag, gypsum such as dihydrate gypsum, semi-water gypsum and anhydrous gypsum, lime such as slaked lime, Clay compounds such as kaolin, mica and bentonite, metal ion exchangers such as zeolite and apatite, chelate compounds and the like can be used in combination.
[0020]
Use of a reducing agent in combination as long as the effects of the present invention are not impaired is preferable from the viewpoint of enhancing the effect of collecting heavy metals. Reducing agents include divalent iron salts such as divalent iron salts such as iron (II) chloride, sulfites such as sodium sulfite, potassium sulfite and calcium sulfite, and bisulfites such as sodium bisulfite and potassium bisulfite. There are sulfides such as sodium sulfide, potassium sulfide, calcium sulfide, and ammonium sulfide, thiosulfates such as sodium thiosulfate and potassium thiosulfate, sulfur dioxide and sulfur, and peat and lignite. It is preferable to use sodium thiosulfate or potassium thiosulfate, which has a high immobilization ratio of heavy metals.
[0021]
【Example】
Experimental example 1
Calcium carbonate and alumina are mixed at a predetermined ratio, heated in an atmosphere with oxygen added to air at 1,600 ° C. for 2 hours, and then calcium aluminates a to c are forcibly cooled by air while blowing. Calcium aluminate d was furnace-cooled (slowly cooled), and the types of calcium aluminates shown in Table 1 were synthesized.
[0022]
This calcium aluminate was pulverized to a Blaine specific surface area of 4,000 cm 2 / g to obtain an arsenic and / or selenium collector. A selenium 1,000 mg / liter standard solution was diluted 20 times to prepare a selenium 50 mg / liter solution. 50 ml of the prepared solution was dispensed into a container, and 2 g of the sample shown in Table 1 was added and sealed. Thereafter, the reaction was carried out on a shaker in a room at 20 ° C., and solid-liquid separation was performed at a material age of 5 minutes and 1 day, and the residual selenium concentration in the liquid phase was measured. The results are shown in Table 1. Ordinary Portland cement was used for comparison.
[0023]
<Materials used>
Calcium aluminate a: C 3 A composition, crystalline (vitrification rate 0%)
Calcium aluminate b: C 12 A 7 composition, crystalline (vitrification rate 0%)
Calcium aluminate c: CA composition, crystalline (vitrification rate 0%)
Calcium aluminate d: C 12 A 7 composition, vitrification rate 100%
Cement: Commercial product, ordinary Portland cement selenium: Se standard solution, 1,000 mg / liter, manufactured by Kanto Chemical Co., Inc.
<Test method>
Selenium concentration: The selenium concentration in the liquid phase is quantified using an ICP emission spectroscopic analyzer.
[0025]
[Table 1]
[0026]
Experimental example 2
Experimental Example 1 except that calcium aluminate b, d and calcium aluminate having a C 12 A 7 composition having a different vitrification rate were used, and the vitrification rate was changed as shown in Table 2 by changing the cooling rate. As well as. The results are shown in Table 2.
[0027]
<Materials used>
Calcium aluminate e: C 12 A 7 composition, vitrification rate 25%
Calcium aluminate f: C 12 A 7 composition, vitrification rate 50%
Calcium aluminate g: C 12 A 7 composition, vitrification rate 75%
[0028]
[Table 2]
[0029]
Experimental example 3
The same procedure as in Experimental Example 1 was performed except that the fineness of the calcium aluminate having a C 12 A 7 composition was changed as shown in Table 3. The results are shown in Table 3.
[0030]
[Table 3]
[0031]
Experimental Example 4
Hemihydrate gypsum was added to 2 g of calcium aluminate d, and the same procedure as in Experimental Example 1 was performed except that the molar ratio of SO 3 / Al 2 O 3 shown in Table 4 was obtained. The results are shown in Table 4.
[0032]
<Materials used>
Hemihydrate gypsum: manufactured by Kanto Chemical Co., Ltd., reagent grade 1
[Table 4]
[0034]
Experimental Example 5
The same procedure as in Experimental Example 1 was performed except that arsenic was used as the harmful substance. The results are shown in Table 5.
[0035]
<Materials used>
Arsenic: As standard solution, 1,000 mg / liter, manufactured by Kanto Chemical Co., Ltd.
<Test method>
Arsenic concentration: Quantitative determination of arsenic concentration in the liquid phase using an ICP emission spectroscopic analyzer.
[0037]
[Table 5]
[0038]
Experimental Example 6
The same operation as in Experimental Example 2 was performed except that arsenic was used as the harmful substance. The results are shown in Table 6.
[0039]
[Table 6]
[0040]
Experimental Example 7
The same procedure as in Experimental Example 3 was performed except that arsenic was used as the harmful substance. The results are shown in Table 7.
[0041]
[Table 7]
[0042]
Experimental Example 8
The experiment was performed in the same manner as in Experimental Example 4 except that arsenic was used as the harmful substance. The results are shown in Table 8.
[0043]
[Table 8]
[0044]
Experimental Example 9
Combining 10g of calcium aluminate d and 1,000ml of water with 100g of sewage sludge incineration ash, leaching test of arsenic and selenium in accordance with Environmental Agency Notification No. 46 “Environmental Standards Related to Soil Environment” Carried out. The results are also shown in Table 5. In addition, when calcium aluminate is not used, when cement is used, the result when a reducing agent is used is also shown.
[0045]
<Materials used>
Sewage sludge incinerated ash: Tokyo, Shinkawa Bank treatment cement: Commercial ordinary Portland cement reducing agent: Ferrous sulfate, commercial product
[Table 9]
[0047]
【The invention's effect】
The harmful substance collection material of the present invention is characterized in that calcium aluminate is excellent in collecting arsenic and selenium, and can be collected simultaneously in a short time even when both coexist. The hazardous substance collecting material of the present invention includes arsenic and / or selenium generated from industries such as semiconductors, glass dyes, ant protection agents, pharmaceuticals, agricultural chemicals, chemical weapons, insecticides, rodenticides, herbicides, and photocopier photoreceptors. It is useful for applications that contain selenium from waste, sludge, sludge incineration ash, municipal waste incineration ash, and soil.
Claims (6)
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| JP2003186761A JP3877712B2 (en) | 2003-06-30 | 2003-06-30 | Arsenic and / or selenium collector |
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| JP2003186761A JP3877712B2 (en) | 2003-06-30 | 2003-06-30 | Arsenic and / or selenium collector |
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| JP2013139019A (en) * | 2011-12-07 | 2013-07-18 | Taiheiyo Materials Corp | Soil working material |
| JP2014004514A (en) * | 2012-06-22 | 2014-01-16 | Taiheiyo Material Kk | Agent for preventing elution of harmful substance and method for preventing elution using the same |
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