WO2022039182A1 - シアン含有水の処理方法および処理装置 - Google Patents
シアン含有水の処理方法および処理装置 Download PDFInfo
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- WO2022039182A1 WO2022039182A1 PCT/JP2021/030131 JP2021030131W WO2022039182A1 WO 2022039182 A1 WO2022039182 A1 WO 2022039182A1 JP 2021030131 W JP2021030131 W JP 2021030131W WO 2022039182 A1 WO2022039182 A1 WO 2022039182A1
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- Prior art keywords
- water
- cyanide
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 139
- 238000000034 method Methods 0.000 title claims description 33
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 title abstract 11
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 37
- 239000005749 Copper compound Substances 0.000 claims abstract description 31
- 150000001880 copper compounds Chemical class 0.000 claims abstract description 31
- 125000004093 cyano group Chemical group *C#N 0.000 claims abstract description 30
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims abstract description 15
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims description 69
- 238000006243 chemical reaction Methods 0.000 claims description 40
- 150000003839 salts Chemical class 0.000 claims description 23
- 239000003002 pH adjusting agent Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 abstract description 29
- 239000002184 metal Substances 0.000 abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 29
- 230000000052 comparative effect Effects 0.000 description 18
- 239000002351 wastewater Substances 0.000 description 16
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 14
- 229910000365 copper sulfate Inorganic materials 0.000 description 13
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 13
- 230000000694 effects Effects 0.000 description 13
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 11
- 239000011790 ferrous sulphate Substances 0.000 description 11
- 235000003891 ferrous sulphate Nutrition 0.000 description 11
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 11
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 10
- 238000010979 pH adjustment Methods 0.000 description 9
- 239000010949 copper Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 7
- -1 copper (I) ions Chemical class 0.000 description 7
- 238000010790 dilution Methods 0.000 description 6
- 239000012895 dilution Substances 0.000 description 6
- 150000002506 iron compounds Chemical class 0.000 description 6
- 239000013225 prussian blue Substances 0.000 description 6
- 229910052709 silver Inorganic materials 0.000 description 6
- 239000004332 silver Substances 0.000 description 6
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical class [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- DCYOBGZUOMKFPA-UHFFFAOYSA-N iron(2+);iron(3+);octadecacyanide Chemical compound [Fe+2].[Fe+2].[Fe+2].[Fe+3].[Fe+3].[Fe+3].[Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] DCYOBGZUOMKFPA-UHFFFAOYSA-N 0.000 description 4
- 229960003351 prussian blue Drugs 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 150000001879 copper Chemical class 0.000 description 3
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 description 3
- 229960002089 ferrous chloride Drugs 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 230000001603 reducing effect Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- VMQMZMRVKUZKQL-UHFFFAOYSA-N Cu+ Chemical compound [Cu+] VMQMZMRVKUZKQL-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- GLUUGHFHXGJENI-UHFFFAOYSA-N Piperazine Chemical compound C1CNCCN1 GLUUGHFHXGJENI-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 150000007661 iron cyano complex Chemical class 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000011780 sodium chloride 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
- 238000004381 surface treatment Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910021591 Copper(I) chloride Inorganic materials 0.000 description 1
- 229910021592 Copper(II) chloride Inorganic materials 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- 239000004277 Ferrous carbonate Substances 0.000 description 1
- 229910021575 Iron(II) bromide Inorganic materials 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 229910019093 NaOCl Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- DGEZNRSVGBDHLK-UHFFFAOYSA-N [1,10]phenanthroline Chemical compound C1=CN=C2C3=NC=CC=C3C=CC2=C1 DGEZNRSVGBDHLK-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- DKVNPHBNOWQYFE-UHFFFAOYSA-N carbamodithioic acid Chemical compound NC(S)=S DKVNPHBNOWQYFE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004737 colorimetric analysis Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- OXBLHERUFWYNTN-UHFFFAOYSA-M copper(I) chloride Chemical compound [Cu]Cl OXBLHERUFWYNTN-UHFFFAOYSA-M 0.000 description 1
- 229910000336 copper(I) sulfate Inorganic materials 0.000 description 1
- DOBRDRYODQBAMW-UHFFFAOYSA-N copper(i) cyanide Chemical compound [Cu+].N#[C-] DOBRDRYODQBAMW-UHFFFAOYSA-N 0.000 description 1
- WIVXEZIMDUGYRW-UHFFFAOYSA-L copper(i) sulfate Chemical compound [Cu+].[Cu+].[O-]S([O-])(=O)=O WIVXEZIMDUGYRW-UHFFFAOYSA-L 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000012470 diluted sample Substances 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000004993 emission spectroscopy Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 229940046149 ferrous bromide Drugs 0.000 description 1
- RAQDACVRFCEPDA-UHFFFAOYSA-L ferrous carbonate Chemical compound [Fe+2].[O-]C([O-])=O RAQDACVRFCEPDA-UHFFFAOYSA-L 0.000 description 1
- 235000019268 ferrous carbonate Nutrition 0.000 description 1
- 229960004652 ferrous carbonate Drugs 0.000 description 1
- 229940116007 ferrous phosphate Drugs 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Inorganic materials Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 229910000015 iron(II) carbonate Inorganic materials 0.000 description 1
- 229910000155 iron(II) phosphate Inorganic materials 0.000 description 1
- GYCHYNMREWYSKH-UHFFFAOYSA-L iron(ii) bromide Chemical compound [Fe+2].[Br-].[Br-] GYCHYNMREWYSKH-UHFFFAOYSA-L 0.000 description 1
- SDEKDNPYZOERBP-UHFFFAOYSA-H iron(ii) phosphate Chemical compound [Fe+2].[Fe+2].[Fe+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O SDEKDNPYZOERBP-UHFFFAOYSA-H 0.000 description 1
- RYZCLUQMCYZBJQ-UHFFFAOYSA-H lead(2+);dicarbonate;dihydroxide Chemical compound [OH-].[OH-].[Pb+2].[Pb+2].[Pb+2].[O-]C([O-])=O.[O-]C([O-])=O RYZCLUQMCYZBJQ-UHFFFAOYSA-H 0.000 description 1
- 150000002681 magnesium compounds Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 description 1
- 229910000342 sodium bisulfate Inorganic materials 0.000 description 1
- ZVCDLGYNFYZZOK-UHFFFAOYSA-M sodium cyanate Chemical compound [Na]OC#N ZVCDLGYNFYZZOK-UHFFFAOYSA-M 0.000 description 1
- CSMWJXBSXGUPGY-UHFFFAOYSA-L sodium dithionate Chemical compound [Na+].[Na+].[O-]S(=O)(=O)S([O-])(=O)=O CSMWJXBSXGUPGY-UHFFFAOYSA-L 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- LIXWSNVLHFNXAJ-UHFFFAOYSA-N sodium;oxidoazaniumylidynemethane Chemical compound [Na+].[O-][N+]#[C-] LIXWSNVLHFNXAJ-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- GTLDTDOJJJZVBW-UHFFFAOYSA-N zinc cyanide Chemical compound [Zn+2].N#[C-].N#[C-] GTLDTDOJJJZVBW-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
- C02F1/705—Reduction by metals
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/18—Cyanides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/20—Total organic carbon [TOC]
Definitions
- the present invention is a cyanide-containing water that stably and efficiently and highly treats cyanide-containing water containing a metal cyano complex and a large amount of inorganic carbon to obtain high-quality treated water in which the total cyanide concentration is sufficiently reduced.
- NaClO is first added to free cyanide under alkaline conditions to make sodium cyanate (first stage), and then NaClO is added to finally nitrogen gas. It is a processing method that decomposes into (second stage). 1st stage: NaCl + NaOCl ⁇ NaCNO + NaCl 2nd stage: 2NaCNO + 3NaOCl ⁇ N 2 + 3NaCl + 2NaHCO 3 (NaHCO 3 ⁇ NaOH + CO 2 )
- This method has a treatment effect on free cyanide, but does not have a sufficient treatment effect on metal cyano complexes such as ferrocyanides.
- the Prussian blue method is a method of adding ferrous sulfate to cyanide-containing water containing ferrocyanide to form and remove a poorly water-soluble metal cyano complex as shown in the following reaction formula.
- Ferrifero type (Brusian blue) 2 [Fe (CN) 6 ] 3 + 3Fe 2+ ⁇ Fe 3 [Fe (CN) 6 ] 2
- Ferroferi type turnbull blue
- Ferrofero type (Berlin white)
- a total cyan method for example, there is a method of adding a copper compound and a magnesium compound to cyan-containing water to generate and remove an insoluble salt of cyan according to the following reaction formula in the presence of a reducing agent such as sodium bisulfite ().
- Patent Document 1 a reducing agent such as sodium bisulfite
- cyan can be stably treated by forming a sparingly soluble salt with Cu in any metal cyano complex.
- Patent Document 2 A method for separating a poorly soluble silver cyano complex to be produced by adding an iron compound such as ferrous sulfate and a copper compound such as copper sulfate to water containing a silver cyano complex and adjusting the pH to 3 to 8. .
- Patent Document 3 Separation of ferrous salt and copper salt in iron cyano complex-containing water by forming a sparingly soluble salt under alkaline conditions of pH 9 to 11 in the presence of ferrous salt and a reducing agent other than the copper salt. how to.
- Patent Document 4 A method of adding a ferric salt and a ferrous salt to cyanide-containing water and then adjusting the pH to 6 to 8 to remove the produced water-insoluble salt.
- the present invention is a cyanide-containing water that stably and efficiently and highly treats cyanide-containing water containing a metal cyano complex and a large amount of inorganic carbon to obtain high-quality treated water in which the total cyanide concentration is sufficiently reduced. It is an object of the present invention to provide the processing method and processing apparatus of.
- the present inventor adds a pH adjuster to cyanide-containing water containing a metal cyano complex and a large amount of inorganic carbon to adjust the pH to 7.5 or less in advance. After that, by adding a ferrous salt and a copper compound and reacting them, it is possible to efficiently generate an insoluble salt of cyanide and obtain a high-quality treated water in which the total cyanide concentration is sufficiently reduced. I found it.
- the present invention has been achieved based on such findings, and the gist thereof is as follows.
- pH 7 A method for treating cyanide-containing water, which separates an insoluble salt of cyanide produced by adding a ferrous salt as a reducing agent and adding a copper compound after adjusting the pH to 5 or less.
- a pH adjusting means for adjusting the pH to 5 or less
- cyanide-containing water containing a metal cyano complex and containing a large amount of inorganic carbon is stably and efficiently and highly treated to obtain high-quality treated water in which the total cyanide concentration is sufficiently reduced. Can be done.
- FIG. 1 is a system diagram showing an example of an embodiment of the cyanide-containing water treatment apparatus of the present invention.
- the method for treating cyan-containing water of the present invention comprises cyan-containing water containing a metal cyano complex and containing 100 mg-C / L or more of inorganic carbon as a TIC measurement value by a TOC meter described in JIS K0102, paragraph 22. After adjusting the pH to 7.5 or less by adding an adjusting agent, a ferrous salt is added as a reducing agent, and a copper compound is added to separate the produced cyan insoluble salt.
- the cyanated water treatment apparatus of the present invention contains a metal cyano complex and contains inorganic carbon of 100 mg-C / L or more as a TIC measurement value by a TOC meter described in JIS K0102, 22.
- a ferrous salt is added as a reducing agent to a pH adjusting means for adjusting the pH to 7.5 or less by adding an adjusting agent, and water adjusted to the pH by the pH adjusting means, and a copper compound is added to cause a reaction. It is characterized by comprising a reaction vessel and a solid-liquid separation means for separating an insoluble salt of cyanide produced in the reaction vessel.
- TIC value Cyan-containing water containing a metallic cyano complex and containing 100 mg-C / L or more of inorganic carbon as a TIC measured value (hereinafter, simply referred to as "TIC value") by the TOC meter described in JIS K0102 22 (hereinafter referred to as "TIC value").
- TIC value TIC measured value
- the water to be treated of the present invention did not provide a sufficient cyanide removal effect.
- the water to be treated of the present invention is usually weakly alkaline to alkaline with a pH of 8 to 10, but a pH adjusting agent is added to such cyan-containing water in advance to adjust the pH to 7.5 or less, and then the water is used as a reducing agent.
- a pH adjusting agent is added to such cyan-containing water in advance to adjust the pH to 7.5 or less, and then the water is used as a reducing agent.
- Patent Document 2 states that an iron compound such as ferrous sulfate and a copper compound such as copper sulfate are added to the silver cyano complex-containing water.
- an iron compound such as ferrous sulfate and a copper compound such as copper sulfate are added to the silver cyano complex-containing water.
- a method of adjusting the pH to 3 to 8 and separating the produced sparingly soluble silver cyano complex has been proposed, but in Patent Document 2, the pH is adjusted at the same time as the addition of the iron compound and the copper compound.
- Fe 2+ is not stabilized and the ferrous salt cannot act as a reducing agent, so that the effect as in the present invention is obtained. Cannot be obtained, and cyan remains.
- the present inventor analyzes such sample water after diluting it to reduce the influence of interfering components, and multiplying the obtained analytical value by a dilution factor to obtain the total cyanide concentration. Considering that this is effective for grasping the correct total cyanide concentration, it was decided to analyze the diluted sample water in the examples and comparative examples described later.
- the water to be treated of the present invention is cyanide-containing water containing a metal cyano complex and having an inorganic carbon content of 100 mg-C / L or more as a TIC value.
- a sufficient cyan removal effect can be obtained without applying the present invention.
- the TIC value of the water to be treated of the present invention is preferably 200 mg-C / L or more.
- the TIC value of the water to be treated of the present invention is 500 mg-C / L or less. Is preferable.
- the M alkalinity of the water to be treated of the present invention having such a TIC value is usually 400 mg-CaCO 3 / L or more, preferably 400 to 5000 mg-CaCO 3 / L, and more preferably 400 to 1000 mg-CaCO 3 / L. Is.
- the M alkalinity of the water to be treated of the present invention is measured by the method described in the section of Examples described later.
- the inorganic carbon contained in the treated water of the present invention is carbonate ion (CO 3-2- ), hydrogen carbonate ion (HCO 3 ⁇ ), and carbonic acid (H 2 CO 3 ) .
- the metal cyano complex contained in the water to be treated of the present invention is not particularly limited, and examples thereof include an iron cyano complex, a silver cyano complex, a nickel cyano complex, a copper cyano complex, and a zinc cyano complex.
- the water to be treated of the present invention may contain only one of these metal cyano complexes, or may contain two or more of these metal cyano complexes.
- the water to be treated of the present invention may contain free cyanide in addition to the metal cyano complex.
- the content of the metal cyano complex in the water to be treated according to the present invention is usually about 0.5 to 30 mg / L in terms of cyanide, and the water to be treated of the present invention contains cyanide other than the metal cyano complex such as free cyanide.
- the total cyanide concentration is usually about 0.5 to 10 mg / L.
- the total cyanide concentration of the water to be treated of the present invention is measured by the method described in the section of Examples below.
- Such treatment target water of the present invention includes, for example, plating factory wastewater, mineral processing factory wastewater, city gas manufacturing factory wastewater, chemical factory wastewater, oil factory wastewater, gas factory wastewater, metal smelting factory wastewater, chromate treatment.
- Metal surface treatment factory wastewater, oil / coal thermal decomposition process wastewater, photo factory wastewater, pharmaceutical factory wastewater, precious metal mining wastewater, plating wastewater, plating jig cleaning wastewater, etching wastewater, metal surface treatment factory wastewater, ammonia synthesis Examples include factory effluent.
- the pH of the water to be treated of these inventions is usually about 8 to 12, and in order to make the pH 7.5 or less, it is necessary to add a pH adjuster.
- a pH adjusting agent is added to the water to be treated of the present invention to adjust the pH to 7.5 or less.
- the pH of the water to be treated of the present invention is usually 8 to 12, it is necessary to add an ordinary acid as a pH adjuster in order to make the pH 7.5 or less.
- the acid used for pH adjustment is not particularly limited, and inorganic acids such as sulfuric acid and hydrochloric acid can be used.
- the adjusted pH value is preferably low from the viewpoint of the effect of removing cyan, preferably pH 7 or less, but from the viewpoint of the cost of the pH adjuster and the safety that free cyan is gasified when the pH is too low.
- the adjusted pH value is preferably 5 or more, more preferably 5.5 or more.
- This pH adjustment is carried out by adding a pH adjusting agent to the water to be treated of the present invention.
- a pH adjusting agent for example, a pH adjusting tank.
- the water to be treated of the present invention and the pH adjusting agent are sufficiently stirred and mixed in the pH adjusting tank, and then subjected to the next reaction step of the ferrous salt and the copper compound.
- the residence time in the pH adjusting tank is preferably about 5 to 60 minutes. If a sufficient mixing time can be secured, a pH adjuster can be line-mixed with the water to be treated of the present invention to adjust the pH.
- a ferrous salt is added as a reducing agent to the water to be treated of the present invention in which the pH is adjusted in advance to stabilize the pH value, and a copper compound is added to form an insoluble salt of cyanide. ..
- the ferrous salts include ferrous sulfate, ferrous chloride, ferrous nitrate, ferrous bromide, ferrous phosphate, ferrous hydrogen carbonate, ferrous carbonate and other inorganic ferrous irons.
- ferrous sulfate and ferrous chloride are preferable from the viewpoint of being commercially available at low cost.
- Copper compounds generate copper (I) ions in the presence of a reducing agent, and water-soluble salts are generally used.
- a copper compound may be either a copper (I) compound or a copper (II) compound, but since the copper (I) compound is generally sparingly soluble and difficult to obtain, the copper (II) compound.
- Is preferably used together with a ferrous salt as a reducing agent to reduce to a compound of copper (I) and react with a metal cyano complex or free cyanide.
- divalent copper salts such as water-soluble copper sulfate (II), copper (II) chloride, and copper (II) nitrate can be used.
- copper (I) chloride, copper (I) sulfate and the like can be used.
- copper (I) sulfate and the like can be used.
- One of these copper compounds may be used alone, or two or more thereof may be mixed and used.
- the amount of ferrous salt added to the pH-adjusted water to be treated of the present invention is such that the amount required to create a reducing atmosphere in the water to be treated, specifically, the dissolved oxygen is 0.5 mg / L or less. It is preferable to add under various conditions. For example, for water to be treated such that the dissolved oxygen shown in JIS K0102 32.3 is 6 mg / L, when the ferrous salt is ferrous sulfate, the pure content is about 50 to 100 mg / L. In the case of ferrous chloride, the pure content is preferably about 50 to 80 mg / L.
- the amount of the copper compound added is usually equal to or more than the cyan content in the water to be treated of the present invention, but it is preferable to add an excess amount in order to increase the cyan removal rate.
- the amount of the copper compound added is generally preferably 1.05 to 1.5 equivalents, particularly 1.1 to 1.3 equivalents, relative to the cyan content in the water to be treated of the present invention.
- a heavy metal collecting agent such as dithiocarbamic acid or piperazine is added to insolubilize the copper as a complex, and the copper compound is removed together with the insoluble salt of cyanide. Is preferable.
- the water to be treated of the present invention having a pH adjusted to 7.5 or less is introduced into a reaction vessel, and ferrous iron is introduced.
- ferrous iron is introduced. This can be done by adding a salt and a copper compound.
- a residence time of 1 minute or more, for example, about 1 to 10 minutes in this reaction vessel.
- an inorganic flocculant such as polyaluminum chloride and / or a polymer flocculant may be added to the reaction solution to perform the flocculation treatment.
- the ferrous salt added as a reducing agent becomes a sludge of Fe (OH) 3 by a reducing reaction and becomes a core of flocs. It is preferable that the flocs are coarsened by adding a polymer flocculant and stirring and mixing the mixture accordingly.
- a settling tank is usually used as the solid-liquid separation means, but it is not limited to the settling tank.
- FIG. 1 is a system diagram showing an example of an embodiment of the cyanide-containing water treatment apparatus of the present invention.
- raw water to be treated of the present invention is introduced into a pH adjusting tank 1, an acid is added as a pH adjusting agent, and the mixture is stirred by a stirrer 1B to have a predetermined pH of 7.5 or less. Adjust the pH to pH.
- the pH of the liquid in the pH adjusting tank 1 is measured by a pH meter 1A, and the amount of acid added is controlled based on the measured value to adjust the pH to a predetermined value.
- the pH adjustment water adjusted to a predetermined pH value of pH 7.5 or less is then fed to the reaction tank 2, and the ferrous salt and the copper compound are added under stirring by the stirrer 2B.
- the reaction between the copper compound and the metal cyano complex under the reduction conditions produces an insoluble salt of cyanide.
- reaction solution in the reaction tank 2 is then solid-liquid separated in the settling tank 3, and the separated water is taken out as treated water.
- the separated sludge is extracted from the system and treated with a dehydrator or the like.
- 3A is a stirrer.
- An inorganic flocculant may be added to the reaction solution from the reaction tank 2 depending on the agglomeration state, or a polymer flocculant may be further added to perform the flocculation treatment.
- a coagulation tank may be provided between the reaction tank 2 and the settling tank 3.
- the pH adjustment tank sulfuric acid is added to the raw water to adjust the pH to the pH shown in Table 1, then the pH adjustment water is fed to the reaction tank, and the ferrous salt shown in Table 1 is used as a reducing agent in the reaction tank.
- Copper sulfate (CuSO 4 ) was added at an amount shown in Table 1 and 130 mg / L was added and reacted under stirring to obtain cyanide-treated water.
- the residence time of the pH adjustment tank was 5 minutes, and the residence time of the reaction tank was 5 minutes.
- the amount of ferrous salt added shown in Table 1 is the amount at which the dissolved oxygen concentration in water as measured by JIS K0102 32.3 is 0.5 mg / L.
- the amount of copper sulfate added is 0.7 equivalents with respect to cyanide in the raw water.
- Examples 1 to 6 and Comparative Examples 1 to 6 below copper sulfate (CuSO 4 ) was added as a 20% solution of CuSO 4.5H 2O, and ferrous sulfate (FeSO 4 ) was added as a 20% solution.
- Iron (FeCl 2 ) chloride was added as a 32% solution, sodium bisulfate (NaHSO 3 ) was added as a 10% solution, and Table 1 shows the amount added to the raw water as these solutions. ..
- Comparative Example 2 In Comparative Example 1, the reaction was carried out in the same manner except that 130 mg / L of copper sulfate was added together with sodium bisulfite. Table 1 shows the water quality measurement results of the obtained cyanide-treated water.
- Comparative Example 3 In Comparative Example 2, the reaction was carried out in the same manner except that sulfuric acid was added prior to the addition of sodium sulfite and copper sulfate to adjust the pH to 5.5. Table 1 shows the water quality measurement results of the obtained cyanide-treated water.
- Comparative Example 1 is a system in which sodium bisulfite is only added, and at first glance it seems that the total CN could be reduced by using only sodium bisulfite, but when the dilution operation is performed, the total CN concentration of the treated water is the same as that of the raw water. It can be said that cyanide cannot be removed with sodium bisulfite.
- the reason why the CN analysis value differs depending on the presence or absence of dilution in this way is that the analysis of all CNs is hindered by the sulfur dioxide gas contained in sodium bisulfite, but the concentration of sodium bisulfite decreases due to the dilution operation, and the sulfur dioxide gas When it is no longer affected by, it is considered that the original CN concentration is analyzed.
- Comparative Examples 2 and 3 are conventional methods in which sodium bisulfite is added as a reducing agent to reduce copper sulfate to copper (I) ions for treatment, but the treated water is diluted to affect the effect of sodium bisulfite. When is reduced, a phenomenon is observed in which the total CN concentration increases, and it can be seen that all CN remains.
- Fe 2+ of the ferrous salt obtained is Fe 3+ and Fe (OH) 3 . That is, by lowering the pH, it becomes stable as Fe 2+ ions, acts as a reducing agent for Cu 1+ , and can maintain good quality of treated water reaching CN.
- Comparative Example 5 is a conventional Prussian blue method, but it was difficult to obtain sufficient cyan-reach water quality at pH 6.5.
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Abstract
Description
1段目:NaCN+NaOCl→NaCNO+NaCl
2段目:2NaCNO+3NaOCl→N2+3NaCl+2NaHCO3
(NaHCO3⇔NaOH+CO2)
3[Fe(CN)6]4-+4Fe3+→Fe4[Fe(CN)6]3
フェリフェロ形 (ブルシアンブルー)
2[Fe(CN)6]3-+3Fe2+→Fe3[Fe(CN)6]2
フェロフェリ形 (ターンブルブルー)
[Fe(CN)6]4-+2Fe2+→Fe2[Fe(CN)6]
フェロフェロ形 (ベルリンホワイト)
Fe4[Fe(CN)6]3+12OH-
→3[Fe(CN)6]4-+4Fe(OH)3
紺青法は、その反応メカニズムから、鉄以外の金属シアノ錯体(亜鉛、銅、銀、ニッケルなどの金属シアノ錯体)に対しては効果が低いと言われている。
特許文献2:銀シアノ錯体含有水に硫酸第一鉄などの鉄化合物と硫酸銅などの銅化合物とを添加すると共にpHを3~8に調整し、生成する難溶性銀シアノ錯体を分離する方法。
特許文献3:鉄シアノ錯体含有水に第一鉄塩と銅塩とを、第一鉄塩および銅塩以外の還元剤の存在下、pH9~11のアルカリ性条件で難溶性塩を生成させて分離する方法。
特許文献4:シアン含有水に、第二鉄塩および第一銅塩を添加した後、pH6~8に調整し、生成した水不溶性塩を除去する方法。
本発明はこのような知見に基づいて達成されたものであり、以下を要旨とする。
金属シアノ錯体を含み、かつ無機炭素を、JIS K0102 22項に記載されたTOC計によるTIC計測値(以下、単に「TIC値」と称す。)として100mg-C/L以上含むシアン含有水(以下、「本発明の処理対象水」と称す場合がある。)に対しては、従来法では十分なシアン除去効果が得られなかった。
<本発明の処理対象水>
本発明の処理対象水は、金属シアノ錯体を含み、無機炭素の含有量がTIC値として100mg-C/L以上であるシアン含有水である。無機炭素の含有量がTIC値として100mg-C/L未満のシアン含有水では、本発明を適用せずとも十分なシアン除去効果を得ることができる。本発明の効果をより有効に得る上で、本発明の処理対象水のTIC値は好ましくは200mg-C/L以上である。一方、TIC値が過度に高いとH2SO4などのpH調整剤を多く必要とし、経済的な問題があるため、本発明の処理対象水のTIC値は500mg-C/L以下であることが好ましい。
本発明の処理対象水はこれらの金属シアノ錯体の1種のみを含むものであってもよく、2種以上を含むものであってもよい。
本発明においてはまず、本発明の処理対象水にpH調整剤を添加してpH7.5以下にpH調整する。前述の通り、本発明の処理対象水のpHは通常8~12であるので、pH7.5以下とするために、pH調整剤として通常酸を添加する必要がある。
本発明では、上記の通り、予めpH調整してpH値を安定させた本発明の処理対象水に還元剤として第一鉄塩を添加すると共に銅化合物を添加してシアンの不溶性塩を生成させる。
銅(I)の化合物としては、塩化銅(I)、硫酸銅(I)などを用いることができる。
これらの銅化合物は、1種を単独で用いてもよく、2種以上を混合して用いてもよい。
上記の反応後は、生成したシアンの不溶性塩を固液分離して処理水を得る。
次に、図1を参照して本発明のシアン含有水の処理装置について説明する。
図1は本発明のシアン含有水の処理装置の実施の形態の一例を示す系統図である。
以下の実施例及び比較例において、原水と処理水の水質は、次のようにして測定した。
JIS K0102-38に記載された方法で測定した。
シアン処理水についての測定は、希釈なしでの測定と、蒸留水で10倍に希釈した希釈水での測定とを行った。原水については10倍希釈した希釈水での測定のみ行った。前述の通り、希釈水での測定は、水中の全CN分析の妨害成分による影響を低減するためであり、10倍希釈水で得られた値を「計測値」とし、この計測値を10倍した値を「測定値」として表記した。
Fe2+,Cu,Znについては、検水(原水、処理水)を0.45μmフィルターでろ過したろ液について分析した。Fe2+はo-フェナントロリン比色法で分析した。Cu,ZnはJIS K0102:2013 52-4および53-3に記載されたICP発光分析で分析した。
JIS K0102:2013 22.1に記載の燃焼酸化-赤外線式TOC分析法を用いてTOC計により測定した。
JIS K0102:2013 15-1に記載のpH4.8酸消費量により測定した。
下記水質のシアン含有水(遊離シアンを含む)を原水として本発明に従って処理を行った。
pH:8.0
金属シアノ錯体(フェロシアン、亜鉛シアン錯塩、銅シアン錯塩):2.8mg/L(シアン換算含有量)
全CN:4.0mg/L
Fe2+:0.8mg/L
Zn:1.4mg/L
Cu:1.2mg/L
TIC値:220mg-C/L
Mアルカリ度:2400mg-CaCO3/L
硫酸によるpH調整を行わず、還元剤として重亜硫酸ソーダ(NaHSO3)のみを1000mg/L添加して5分反応を行った。得られたシアン処理水の水質測定結果を表1に示す。
比較例1において、重亜硫酸ソーダと共に硫酸銅を130mg/L添加したこと以外は同様に反応を行った。得られたシアン処理水の水質測定結果を表1に示す。
比較例2において、重亜硫酸ソーダと硫酸銅の添加に先立ち硫酸を添加してpH5.5に調整したこと以外は同様に反応を行った。得られたシアン処理水の水質測定結果を表1に示す。
硫酸によるpH調整を行わなかったこと以外は実施例1と同様に反応を行った。得られたシアン処理水の水質測定結果を表1に示す。
硫酸銅を添加しなかったこと以外は実施例3と同様に反応を行った。得られたシアン処理水の水質測定結果を表1に示す。
原水に還元剤として硫酸第一鉄を400mg/Lと硫酸銅130mg/Lを添加すると共に、硫酸を添加してpH6.5に調整して5分反応を行った。得られたシアン処理水の水質測定結果を表1に示す。
表1の結果から以下のことが分かる。
比較例1は重亜硫酸ソーダを添加しただけの系であり、一見すると重亜硫酸ソーダのみでも全CNが低減できたかのように見えるが、希釈操作をすると処理水の全CN濃度は原水と同じであり、重亜硫酸ソーダではシアン除去はできないと言える。このように希釈の有無でCN分析値が異なるのは、重亜硫酸ソーダに含まれる亜硫酸ガスにより全CNの分析が妨害を受けているが、希釈操作により重亜硫酸ソーダの濃度が低下し、亜硫酸ガスの影響を受けなくなると、本来のCN濃度が分析されることによると考えられる。
比較例6のように、pH6.5にpH調整しても、硫酸第一鉄及び硫酸銅の添加と同時に行うpH調整では、やはり十分なCN除去効果は得られないことが分かる。
本出願は、2020年8月19日付で出願された日本特許出願2020-138789に基づいており、その全体が引用により援用される。
2 反応槽
3 沈殿槽
Claims (2)
- 金属シアノ錯体を含み、かつ無機炭素を、JIS K0102 22項に記載されたTOC計によるTIC計測値として100mg-C/L以上含むシアン含有水に、pH調整剤を添加してpH7.5以下にpH調整した後、還元剤として第一鉄塩を添加すると共に、銅化合物を添加することにより生成したシアンの不溶性塩を分離するシアン含有水の処理方法。
- 金属シアノ錯体を含み、かつ無機炭素を、JIS K0102 22項に記載されたTOC計によるTIC計測値として100mg-C/L以上含むシアン含有水に、pH調整剤を添加してpH7.5以下にpH調整するpH調整手段と、該pH調整手段でpH調整された水に還元剤として第一鉄塩を添加すると共に、銅化合物を添加して反応させる反応槽と、該反応槽で生成したシアンの不溶性塩を分離する固液分離手段とを備えるシアン含有水の処理装置。
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JPS59115783A (ja) | 1982-12-24 | 1984-07-04 | Kurita Water Ind Ltd | 銀シアン錯体含有水の処理方法 |
CA1321429C (en) * | 1987-06-23 | 1993-08-17 | Ernest Goodwin | Process for the removal of cyanide and other impurities from solution |
JP2580610B2 (ja) | 1987-07-27 | 1997-02-12 | 日本電気環境エンジニアリング株式会社 | 鉄シアン錯体含有水の処理方法 |
CA1333106C (en) * | 1989-05-24 | 1994-11-15 | Serena Jane Domvile | Process for removal of inorganic and cyanide contaminants from wastewater |
JP4639309B2 (ja) | 2004-04-30 | 2011-02-23 | 株式会社片山化学工業研究所 | シアン含有廃水の処理方法 |
JP2013163144A (ja) * | 2012-02-10 | 2013-08-22 | Nippon Steel & Sumikin Eco-Tech Corp | シアン含有廃水の処理方法 |
JP5962177B2 (ja) | 2012-04-25 | 2016-08-03 | 栗田工業株式会社 | シアン含有排水の処理方法および処理剤 |
CN107935240B (zh) * | 2017-11-28 | 2023-10-24 | 贵州锦丰矿业有限公司 | 一种SO2/Air法-络合沉淀法联合处理氰化浸金尾矿浆和废水的方法 |
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- 2021-08-18 KR KR1020227040635A patent/KR20230051427A/ko active Search and Examination
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JP2014223579A (ja) * | 2013-05-15 | 2014-12-04 | Jfeケミカル株式会社 | シアン含有排水の処理方法 |
JP2020138789A (ja) | 2019-02-28 | 2020-09-03 | 株式会社吉野工業所 | 吐出容器 |
CN110950502A (zh) * | 2019-12-24 | 2020-04-03 | 惠州Tcl环境科技有限公司 | 利用三氯化铁蚀刻废液协同处理含铁氰化钾废水的方法 |
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YOSHIHIRO ETOTOSHITSUGU NAKAHARA: "Inorganic Wastewater Treatment Techniques Useful in the Field", 13 May 2007, KOGYO CHOSAKAI PUBLISHING CO., LTD., pages: 151 - 157 |
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JP2022034874A (ja) | 2022-03-04 |
EP4201893A4 (en) | 2024-07-03 |
EP4201893A1 (en) | 2023-06-28 |
BR112023001686A2 (pt) | 2023-03-28 |
CN115916709A (zh) | 2023-04-04 |
TW202208285A (zh) | 2022-03-01 |
JP7074167B2 (ja) | 2022-05-24 |
KR20230051427A (ko) | 2023-04-18 |
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