WO2018155687A1 - 金属回収剤、金属化合物回収剤、及び、金属又は金属化合物の回収方法 - Google Patents
金属回収剤、金属化合物回収剤、及び、金属又は金属化合物の回収方法 Download PDFInfo
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- WO2018155687A1 WO2018155687A1 PCT/JP2018/006993 JP2018006993W WO2018155687A1 WO 2018155687 A1 WO2018155687 A1 WO 2018155687A1 JP 2018006993 W JP2018006993 W JP 2018006993W WO 2018155687 A1 WO2018155687 A1 WO 2018155687A1
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- Prior art keywords
- metal
- test
- solution
- dried product
- cells
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 199
- 239000002184 metal Substances 0.000 title claims abstract description 199
- 238000011084 recovery Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 59
- 150000002736 metal compounds Chemical class 0.000 title claims abstract description 39
- 238000001179 sorption measurement Methods 0.000 claims abstract description 19
- 239000000243 solution Substances 0.000 claims description 109
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 42
- 239000002253 acid Substances 0.000 claims description 34
- 239000010931 gold Substances 0.000 claims description 33
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 24
- 229910052737 gold Inorganic materials 0.000 claims description 24
- 238000010828 elution Methods 0.000 claims description 23
- 229910052763 palladium Inorganic materials 0.000 claims description 18
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 17
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 14
- 241000206585 Cyanidium Species 0.000 claims description 14
- 150000003863 ammonium salts Chemical class 0.000 claims description 13
- 239000011259 mixed solution Substances 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 7
- 229910021529 ammonia Inorganic materials 0.000 claims description 7
- 229910052741 iridium Inorganic materials 0.000 claims description 7
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 7
- 229910052762 osmium Inorganic materials 0.000 claims description 7
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 claims description 7
- 229910052697 platinum Inorganic materials 0.000 claims description 7
- 229910052707 ruthenium Inorganic materials 0.000 claims description 7
- 150000002739 metals Chemical class 0.000 claims description 5
- IZLAVFWQHMDDGK-UHFFFAOYSA-N gold(1+);cyanide Chemical compound [Au+].N#[C-] IZLAVFWQHMDDGK-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 8
- 239000012237 artificial material Substances 0.000 abstract description 4
- 241000084008 Cyanidiales Species 0.000 abstract 4
- 238000012360 testing method Methods 0.000 description 187
- 210000004027 cell Anatomy 0.000 description 76
- 239000000047 product Substances 0.000 description 59
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 53
- 239000006228 supernatant Substances 0.000 description 30
- 229910000510 noble metal Inorganic materials 0.000 description 25
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 description 18
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 15
- 239000007864 aqueous solution Substances 0.000 description 12
- 239000007788 liquid Substances 0.000 description 9
- 239000010814 metallic waste Substances 0.000 description 9
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 8
- 241000206572 Rhodophyta Species 0.000 description 8
- 238000005119 centrifugation Methods 0.000 description 8
- 239000010970 precious metal Substances 0.000 description 8
- 238000001035 drying Methods 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 238000004090 dissolution Methods 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000005526 G1 to G0 transition Effects 0.000 description 4
- 230000029553 photosynthesis Effects 0.000 description 4
- 238000010672 photosynthesis Methods 0.000 description 4
- 239000010948 rhodium Substances 0.000 description 4
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 229910052703 rhodium Inorganic materials 0.000 description 3
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- 241001646653 Galdieria Species 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 230000003698 anagen phase Effects 0.000 description 2
- -1 and the like Substances 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 230000034994 death Effects 0.000 description 2
- 238000004108 freeze drying Methods 0.000 description 2
- 239000003456 ion exchange resin Substances 0.000 description 2
- 229920003303 ion-exchange polymer Polymers 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004060 metabolic process Effects 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 241000195649 Chlorella <Chlorellales> Species 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000195628 Chlorophyta Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- SWLVFNYSXGMGBS-UHFFFAOYSA-N ammonium bromide Chemical compound [NH4+].[Br-] SWLVFNYSXGMGBS-UHFFFAOYSA-N 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000003834 intracellular effect Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/18—Extraction of metal compounds from ores or concentrates by wet processes with the aid of microorganisms or enzymes, e.g. bacteria or algae
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
- C22B11/042—Recovery of noble metals from waste materials
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/08—Obtaining noble metals by cyaniding
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/22—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition
- C22B3/24—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition by adsorption on solid substances, e.g. by extraction with solid resins
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
- C22B7/007—Wet processes by acid leaching
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present invention relates to a metal recovery agent, a metal compound recovery agent, and a metal or metal compound recovery method.
- Precious metals such as gold and palladium are indispensable for manufacturing various electronic products. While the production volume of electronic products continues to increase, the output of these noble metals is limited. In order to continue producing stable electronic products in the future, it is important to collect precious metals from metal waste liquids obtained from discarded products and recycle precious metals.
- a precious metal recovery method for example, a chemical recovery method using a solvent extraction method or an ion exchange method is known.
- a chemical recovery method using a solvent extraction method or an ion exchange method is known.
- Patent Document 1 uses, as a noble metal adsorbent, a Pseudocollistis genus or a Chlorella genus green alga, or a component obtained by treating a residue of the green algae with sulfuric acid.
- a method for recovering gold and palladium from a metal solution having a hydrochloric acid concentration of 0.1 to 5M is described.
- Patent Document 2 proposes a metal recovery method using living cells of cyanidian red algae.
- Patent Document 2 after adjusting the concentration of acetic acid in a solution containing gold to 15 to 400 mM and / or adjusting the concentration of Cl to less than 5 mM, cells of red algae are cultured in the solution for 24 hours. Describes that red algal cells collect gold.
- Patent Document 1 has a problem that gold or palladium cannot be recovered satisfactorily from a metal solution having a high hydrochloric acid concentration.
- a residue obtained by solvent extraction with an organic solvent is used as a precious metal adsorbent for Pseudocollistis microalgae, if the hydrochloric acid concentration exceeds 1 M, gold and palladium Is about 20%.
- the method described in Patent Document 1 is not a method that can be put into practical use.
- Patent Document 2 can be used only in a solution in which the acetic acid concentration is adjusted to a low concentration, and gold can be recovered from a metal waste liquid with a high acid concentration actually obtained from a waste product or the like. It was not something. Further, the method proposed in Patent Document 2 requires management of living cells, preparation of a solution, and a long recovery time, and is not a simple and efficient method.
- the present invention has been made in view of the above problems. That is, the subject of this invention is providing the metal collection
- the gist of the present invention is as follows.
- a metal comprising a dried product of cyanidium red algae cells, a dried product of cyanidium red algae cells, or a dried product of the cells or an artificial product imitating the dried product of the cells Recovery agent or metal compound recovery agent.
- a dried product of cyanidium red algae cells, a dried product of cyanidium red algae cells, or a dried product of the cells or an artificial product simulating the dried product of the cell derived product in a metal solution A metal or a metal comprising: an addition step of adding to the cell; and an adsorption step of adsorbing the metal or metal compound contained in the metal solution to the cell derived from the dried product, the cell derived product derived from the dried product, or the artificial product Compound recovery method.
- the method further includes an elution step of eluting the cell derived from the dried product, the cell derived product derived from the dried product, or the metal or metal compound adsorbed on the artificial product using a mixed solution containing ammonia and an ammonium salt.
- the metal recovery method according to any one of [2] to [6] above.
- a metal recovery agent and a metal recovery method capable of selectively recovering a precious metal from a solution having a high acid concentration, a solution containing a cyanide complex, or the like simply and efficiently. Is possible.
- the metal or metal compound recovery agent of the present invention is a dried product of cyanidium red algae cells (hereinafter also simply referred to as “cells”), a dried product of cyanidium red algae cells, or a dried product of the cells. Or an artificial product imitating a dried product of the cell-derived product (hereinafter also simply referred to as “artificial product”).
- artificial product imitating a dried product of the cell-derived product hereinafter also simply referred to as “artificial product”.
- the “artificial product produced by imitating a dry product” includes, for example, a product produced by organic synthesis or the like.
- the red algae of the order Cyanidium is not particularly limited, and for example, red algae belonging to the genus Gardieria, the genus Cyanidium, or the genus Cyanidiosis can be used. Among these red algae, those belonging to the genus Galdieria are preferable, and Galdieria sulfuraria (hereinafter referred to as “G. sulfuraria”) is more preferable. It has been confirmed by the present inventor's research (Japanese Patent Application No. 2015-249567) that Cyanidian red algae selectively recover noble metals from a metal solution in cells or on the cell surface. Therefore, the “cell-derived material” of cyanidian red algae may be “intracellular-derived material” or “cell surface-derived material”.
- the dried product used in the present invention can be obtained by subjecting cells of cyanidium red algae or cell-derived materials to a drying treatment.
- the method for the drying treatment is not particularly limited, and for example, a known method such as spray drying treatment, freeze drying treatment, or reduced pressure drying treatment can be used.
- a drying treatment By subjecting the cells to a drying treatment, the acid resistance of the cells is improved, and it is possible to recover the noble metal from a metal waste solution having a high acid concentration without requiring a work such as dilution. Moreover, it becomes possible to improve handleability rather than a living cell by drying-processing to a cell.
- the culture conditions for the cells subjected to the drying treatment are not particularly limited, for example, photoautotrophic conditions that grow only by photosynthesis, photomixed nutrient conditions that grow by both photosynthesis and organic matter metabolism, and metabolism of organic matter in the dark. Any conditions such as heterotrophic conditions that grow by photosynthesis, semi-anaerobic autotrophic conditions that grow by photosynthesis under semi-anaerobic conditions, and semi-anaerobic heterotrophic conditions that ferment in the dark under semi-anaerobic conditions may be used. .
- the time for collecting the cells to be subjected to the drying treatment is not particularly limited, and may be any of induction phase, logarithmic growth phase, stationary phase, or death phase.
- the cells subjected to the drying treatment are not limited to living cells, and may be dead cells. Among these, cells in the logarithmic growth phase, stationary phase, or death phase are preferable from the viewpoint of improving the metal recovery efficiency.
- the method for recovering a metal or metal compound according to the present invention includes a dried product of cyanidium red algae cells, a dried product of cyanidian red algae cells, or a dried product of the cells or a dried product of the cells. Adding an artificial material imitating a metal solution to the metal solution, and adsorption for adsorbing the metal or metal compound contained in the metal solution to the cell derived from the dried product, the cell derived product derived from the dried product, or the artificial product And at least a process.
- the above-mentioned noble metal may be contained in the metal solution as a simple metal or a solid, ion or complex of a metal salt. Even when a precious metal is contained as a solid in the metal solution, the solid is eluted as a metal ion (bioleaching) as a metal ion by a cell derived from a dried product, a cell-derived product, or an artificial product, and collected. It is possible.
- the metal solution is not particularly limited as long as it contains one or more of the above-mentioned noble metals, and may contain base metals such as copper and iron in addition to the above-mentioned noble metals. According to the present invention, it is possible to selectively recover the noble metal from the solution in which the noble metal and the base metal are mixed.
- the metal solution is not particularly limited as long as it can dissolve the above-mentioned noble metals and the like.
- a solution in which the above-mentioned noble metals can exist as a complex having a negative charge is preferable.
- limit especially as a complex with a negative charge For example, it is preferable that they are a chloride complex, a hydroxide complex, or a cyanide complex.
- the metal solution in which the noble metal can exist as a negatively charged complex include, for example, an acid solution containing hydrochloric acid, aqua regia, and the like, or a solution containing a cyanide complex.
- These solutions are, for example, solutions used when dissolving noble metals contained in waste products, that is, solvents for industrially discharged metal waste liquids. According to the present invention, it is possible to selectively recover noble metals from these metal waste liquids.
- a metal solution of this invention it is not necessarily limited to the metal waste liquid discharged
- the acid concentration when the metal solution contains an acid solution is not particularly limited and can be appropriately adjusted according to the type of the acid solution and the type or concentration of the noble metal to be collected. mol / L) or more, preferably 1M or more, more preferably 2M or more. Moreover, as acid concentration, 13 M or less is preferable, for example, and 6 M or less is more preferable. When the acid concentration is less than 0.5M, the metal may not be sufficiently dissolved depending on the metal species. Further, when the acid concentration exceeds 13M, the metal recovery efficiency may be lowered, but it can be compensated for by increasing the addition amount or the reaction time.
- the acid concentration when the collection target is gold is, for example, preferably 0.5 mM or more, more preferably 5 mM or more, and further preferably 500 mM or more.
- money for example, 13M or less is preferable, 10M or less is more preferable, and 6M or less is further more preferable.
- the acid concentration when the collection target is palladium is, for example, preferably 0.5 mM or more, more preferably 5 mM or more, and further preferably 500 mM or more.
- 13M or less is preferable, for example, 10M or less is more preferable, and 6M or less is further more preferable.
- the acid concentration is, for example, preferably 5 mM or more, more preferably 50 mM or more, and further preferably 0.1 M or more. Further, the acid concentration when the collection target is platinum is, for example, preferably 10M or less, more preferably 4M or less, and further preferably 2M or less.
- the acid concentration when the recovery target is ruthenium is, for example, preferably 5 mM or more, more preferably 50 mM or more, and further preferably 0.1 M or more. Further, the acid concentration when the recovery target is ruthenium is, for example, preferably 10M or less, more preferably 4M or less, and further preferably 2M or less.
- the acid concentration when the collection target is rhodium is preferably, for example, 5 mM or more, more preferably 50 mM or more, and further preferably 0.1 M or more. Moreover, as an acid concentration in case collection
- the acid concentration when the recovery target is osmium is, for example, preferably 5 mM or more, more preferably 50 mM or more, and further preferably 0.1 M or more. Moreover, as an acid concentration in case collection
- the acid concentration when the recovery target is iridium is, for example, preferably 5 mM or more, more preferably 50 mM or more, and further preferably 0.1 M or more. Moreover, as an acid concentration in case collection
- the present invention since noble metals can be recovered even from a metal solution having a high acid concentration as described above, an operation such as excessive dilution of an actual metal waste liquid is not required, and the efficiency is excellent. Moreover, since the problem that the volume of a metal waste liquid increases too much by dilution can also be prevented, it is excellent also in space-saving property.
- the addition amount of the dried product in the addition step is not particularly limited and can be appropriately adjusted according to the amount or acid concentration of the metal solution or the type or concentration of the noble metal to be collected. 0.001 mg or more is preferable, 0.01 mg or more is more preferable, and 0.1 mg or more is more preferable with respect to 100 ml of a metal solution having a metal concentration of 1 ppm. Moreover, as addition amount of the dried material in an addition process, 1000 g or less is preferable with respect to 100 ml of metal solutions with a density
- the metal collection efficiency tends to be lowered. Further, even if the amount of dry matter added exceeds 1000 g with respect to 100 ml of the metal solution having a concentration of 1 ppm of the metal to be collected, there is a tendency that no difference is seen in the metal recovery efficiency. It is preferable to increase the amount of dry matter added as the metal concentration or acid concentration increases. The decrease in the metal recovery rate due to the decrease in the amount added can be compensated for by adjusting the acid concentration or increasing the reaction time.
- the pH when the metal solution is a solution containing a cyanide complex is not particularly limited and can be appropriately adjusted according to the type of solution and the type or concentration of the noble metal to be recovered. Is preferable, pH 4 or higher is more preferable, and pH 10 or higher is further preferable. Moreover, as pH of the solution containing a cyanide complex, pH 14 or less is preferable, for example. When the pH of the solution containing the cyanide complex is less than 2, the metal recovery efficiency tends to decrease. Even if the pH of the solution containing the cyanide complex exceeds 14, the metal recovery efficiency tends to decrease.
- the adsorption step can be performed, for example, by stirring a metal solution to which a dried product of cells is added for a predetermined time.
- the time for performing the adsorption step is not particularly limited and can be appropriately adjusted according to the type of solution, the type or concentration of the noble metal to be collected, and is preferably 1 minute or more, and more preferably 3 minutes or more. Preferably, 15 minutes or more is more preferable.
- suction process 24 hours or less are preferable, for example. When the time for performing the adsorption step is less than 1 minute, there is a possibility that the metal cannot be sufficiently recovered. Moreover, even if the time for performing the adsorption process exceeds 24 hours, there is a tendency that no difference is seen in the metal recovery efficiency.
- the temperature at which the adsorption step is performed is not particularly limited and can be appropriately adjusted according to the type of solution, the type or concentration of the noble metal to be recovered, and is preferably 0 ° C. or higher, for example, 4 ° C. or higher. Is more preferable. Moreover, as temperature at the time of performing an adsorption
- the method for recovering a metal or metal compound of the present invention preferably further includes a step for purifying the metal or metal compound adsorbed on cells or the like after the adsorption step.
- steps for purifying the metal etc., for example, a method of burning cells or the like, or elution of cells by dissolving cells or cell surface layers (for example, residues that bind to noble metal complexes) It is possible to carry out by applying a method or the like.
- acidic thiourea solution mixed solution containing ammonia and ammonium salt
- acid solution for example, hydrochloric acid solution, aqua regia
- alkaline solution for example, KOH solution
- metal chelate solution for example, EDTA
- a method of eluting metal or the like using a predetermined metal elution solution such as (solution) can be applied.
- a method of eluting metal or the like using an acidic thiourea solution or a mixed solution containing ammonia and an ammonium salt as the metal elution solution is preferable.
- a method of eluting metal or the like using a mixed solution containing ammonia and an ammonium salt is preferable as the metal elution solution.
- the method for recovering a metal or a metal compound according to the present invention further uses a mixed solution containing ammonia and an ammonium salt for the metal or metal compound adsorbed on the cell derived from the dried product or the cell derived product derived from the dried product. It is preferable to include an elution step for elution.
- the metal adsorbed on the cells or the like in the adsorption step can be eluted using a mixed solution containing ammonia and an ammonium salt.
- the ammonium salt used for the mixed solution is not particularly limited, and for example, ammonium chloride, ammonium sulfate, ammonium carbonate, or ammonium bromide can be used. In addition, it is not eluted only with an ammonia solution or an ammonium salt solution (Ju et al. Bioresource Technology 211 (2016), 754-766).
- the concentration of the ammonium salt in the mixed solution is not particularly limited, but is preferably 0.02M or more, more preferably 0.1M or more, and further preferably 0.2M or more. Moreover, as a density
- concentration of the ammonium salt is less than 0.02M, the elution rate of the metal adsorbed on the cells tends to decrease. Also, when the ammonium salt concentration exceeds 1M, the elution rate of the metal adsorbed on the cells tends to decrease.
- the pH of the mixed solution is not particularly limited, but is preferably, for example, pH 3 or higher, more preferably pH 7 or higher, and further preferably pH 11 or higher. Moreover, as pH of a mixed solution, pH14 or less is preferable, for example, pH13 or less is more preferable, and pH12 or less is further more preferable. When the pH of the mixed solution is less than 3, the elution rate of the metal adsorbed on the cells tends to decrease.
- “recovery rate” refers to a value calculated by the following equation (1).
- the “cell non-addition test” in the following formula (1) is G. live Sulfuraria cells and G. Refers to tests performed without the addition of any of the dry powder made from Sulfuraria cells.
- the “cell addition test” in the following formula (1) is “G. live Sulfuraria cells or G. It refers to a test conducted by adding a dry powder made from Sulfuraria cells.
- Example 1 As Example 1, a selective recovery test of gold and palladium from a hydrochloric acid solution (0.5 to 6 M) using a spray-dried sample was performed.
- spray dry sample refers to a sample prepared by the above method.
- test no As a control test, test no. The same test as in 1-2 was performed, and the metal concentration of the supernatant was measured (Test No. 1-1). Next, the test No. measured as described above. 1-1 and test no. From the difference in metal concentration of 1-2, test no. The recovery rate in 1-2 was calculated. Table 1 shows the measured metal concentration and the recovery rate. The metal concentration and recovery shown in Table 1 are the mean ⁇ SD (standard deviation) of each of three independent tests. In Tables 1 to 8 below, powder “+” indicates that a spray-dried sample or freeze-dried sample was added, and powder “ ⁇ ” did not add a spray-dried sample or freeze-dried sample. It shows that.
- Test Nos. 1-3 to 1-14 Except for changing the concentration of the hydrochloric acid solution to the concentration shown in Table 1, test no. In the same manner as in 1-1 or 1-2, test no. The tests 1-3 to 1-14 were conducted. Table 1 shows the measured metal concentration and recovery rate for each test.
- Example 2 As Example 2, a selective recovery test of gold and palladium from a hydrochloric acid solution (0.5 to 6 M) using a lyophilized sample was performed.
- Test No. 1 was used except that no lyophilized sample was added.
- the same test as in 2-2 was performed, and the metal concentration of the supernatant was measured (Test No. 2-1).
- Test No. 2-1 the test No. measured as described above. 2-1 and Test No. 2-2 From the difference in metal concentration, test no.
- the recovery rate in 2-2 was calculated.
- Table 2 shows the measured metal concentration and the recovery rate.
- the metal concentration and the recovery rate shown in Table 2 are the average value ⁇ SD (standard deviation) of each of three independent tests.
- Test Nos. 2-3 to 2-14 Except for changing the concentration of the hydrochloric acid solution to the concentration shown in Table 2, test no. In the same manner as in 2-1 or 2-2, test no. Tests 2-3 to 2-14 were conducted. Table 2 shows the measured metal concentration and recovery rate for each test.
- Example 3 As Example 3, a selective recovery test of gold and palladium from 4M aqua regia using a spray-dried sample was performed.
- test no As a control test, test no. The same test as in 3-2 was performed, and the metal concentration of the supernatant was measured (Test No. 3-1). Next, the test No. measured as described above. 3-1 and test no. From the difference in metal concentration of 3-2, test no. The recovery rate in 3-2 was calculated. Table 3 shows the measured metal concentration and the recovery rate. In addition, the metal concentration and the recovery rate shown in Table 3 are average values ⁇ SD (standard deviation) of each of three independent tests.
- Example 4 As Example 4, a gold and palladium elution test was performed using a spray-dried sample in which gold and palladium were selectively recovered from a 4M aqueous solution.
- test no As a control test, test no. The same test as in 4-2 was performed, and the metal concentration of the supernatant was measured (Test No. 4-1). Next, the test No. measured as described above. 4-1 and test no. From the difference in metal concentration of 4-2, test no. In 4-2, the metal concentration recovered in the spray-dried sample was calculated. Table 4 shows the measured metal concentration of the supernatant and the metal concentration recovered in the spray-dried sample.
- test no The spray-dried sample fraction (precipitate fraction) collected by centrifugation in 4-2 was dissolved in 1 ml of 4M aqueous solution and washed by centrifuging the aqueous solution (12,000 rpm, 1 minute). .
- 1 ml of 0.2M NH 4 Cl, 2.8% NH 3 solution (pH 11) was added as a metal elution solution to the spray-dried sample fraction (precipitation fraction) obtained by centrifugation of the aqua regia solution.
- the mixture was stirred at room temperature for 30 minutes.
- the solution was centrifuged again (12,000 rpm, 1 minute), and the metal concentration of the obtained supernatant was measured using ICP-MS.
- the measured values are shown in Table 4 as the metal concentration of the eluate.
- Test Nos. 4-3 to 4-10 Except that the concentration of each metal contained in the 4M aqueous solution was changed to the concentration shown in Table 4, test no. In the same manner as in 4-1 or 4-2, test no. Tests 4-3 to 4-10 were performed. Table 4 shows the metal concentration of the supernatant, the metal concentration recovered in the spray-dried sample, the metal concentration of the eluate, and the elution rate for each test.
- Example 5 As Example 5, a recovery test of gold from a 0.1 mM KOH solution (pH 10) containing cyan and gold was performed using a spray-dried sample. In the 0.1 mM KOH solution, Au 3+ ions are stably present as a cyanide complex.
- test no As a control test, test no. The same test as in 5-2 was performed, and the metal concentration of the supernatant was measured (Test No. 5-1). Next, the test No. measured as described above. 5-1 and test no. From the difference in metal concentration of 5-2, the test No. The recovery rate in 5-2 was calculated. Table 5 shows the measured metal concentration and the recovery rate. Note that the metal concentrations and recovery rates shown in Table 5 are average values of two independent tests.
- Example 6 As Example 6, a selective recovery test of platinum, gold, palladium, and osmium from hydrochloric acid solution (1-4M) using a spray-dried sample was performed.
- Test Nos. 6-3 to 6-8 Except that the concentration of the hydrochloric acid solution was changed to the concentrations shown in Tables 6 and 7, Test No. In the same manner as in 6-1 or 6-2, test no. Tests 6-3 to 6-8 were performed. For each test, the measured metal concentration is shown in Table 6, and the recovery is shown in Table 7.
- Example 7 As Example 7, a selective recovery test of ruthenium from hydrochloric acid solution (1 or 2M) using a spray-dried sample was performed.
- Test Nos. 7-1 and 7-2 First, 20 mg of a spray-dried sample was added to 1 ml of a 1M hydrochloric acid solution containing 10 ppm of Ru 3+ and stirred overnight at room temperature. Next, the hydrochloric acid solution was centrifuged (12,000 rpm, 1 minute), and the metal concentration of the obtained supernatant was measured using ICP-MS (Test No. 7-2). In addition, as a control test, Test No. 1 was used except that the spray-dried sample was not added. The same test as in 7-2 was performed, and the metal concentration of the supernatant was measured (Test No. 7-1). The measured metal concentration is shown in Table 8.
- Test Nos. 7-3 and 7-4 Except that the concentration of the hydrochloric acid solution was changed to the concentration shown in Table 8, test no. In the same manner as in 7-1 or 7-2, test no. Tests 7-3 and 7-4 were performed. Table 8 shows the measured metal concentration and recovery rate for each test.
- Comparative Example 1 As Comparative Example 1, G.I. A selective recovery test of metals from 0.43M aqua regia was performed using live Sulfuraria cells.
- test no As a control test, G. Except that no live Sulfuraria cells were added, test no. The same test as in C1-2 was performed, and the metal concentration of the supernatant was measured (Test No. C1-1). Next, the test No. measured as described above. C1-1 and test no. From the difference in the metal concentration of C1-2, the test No. The recovery rate at C1-2 was calculated. Table 9 shows the measured metal concentration and the recovery rate. The metal concentration and recovery shown in Table 9 are the mean ⁇ SD (standard deviation) of each of the three independent tests.
- test no As a control test, G. Except that no live Sulfuraria cells were added, test no. The same test as in C2-2 was performed, and the metal concentration of the supernatant was measured (Test No. C2-1). Next, the test No. measured as described above. C2-1 and test no. From the difference in the metal concentration of C2-2, the test No. The recovery rate at C2-2 was calculated. Table 10 shows the measured metal concentration and the recovery rate.
- Example 8 As Example 8, a gold elution test was conducted using a spray-dried sample obtained by recovering gold from a 4M aqueous solution and an ion exchange resin.
- Test No. 8-1 First, 20 mg of a spray-dried sample was added to 1 ml of a 4M aqueous solution containing 10 ppm of Au 3+ and stirred at room temperature for 30 minutes. Next, the aqua regia solution was centrifuged (12,000 rpm, 1 minute), and the metal concentration of the obtained supernatant was measured using ICP-MS (Test No. 8-1). In addition, test no. The same test as in 8-1 was performed, and the metal concentration of the supernatant was measured (Test No. 8-1-control). Next, the test No. measured as described above. 8-1 and test no. 8-1-From the difference in the metal concentration of the control, the test no. In 8-1, the metal concentration recovered in the spray-dried sample was calculated.
- test no The spray-dried sample fraction (precipitate fraction) collected by centrifugation in 8-1 was dissolved in 1 ml of 4M aqueous solution and washed by centrifuging (12,000 rpm, 1 minute). .
- 1 ml of 4M HCl was added as a metal elution solution to the spray-dried sample fraction (precipitation fraction) obtained by centrifugation of the aqua regia solution, and stirred at room temperature for 30 minutes.
- the solution was centrifuged again (12,000 rpm, 1 minute), and the metal concentration of the obtained supernatant was measured using ICP-MS. The measured value was used as the metal concentration of the eluate.
- Test Nos. 8-2 to 8-5 As a metal elution solution, instead of 4M HCl, 0.5M EDTA (pH 8) (Test No. 8-2), 1M Thiourea / 0.1M HCl (Test No. 8-3), 1M KOH (Test No. 8) 8-4) or 6M aqua regia (test No. 8-5) except that test no. In the same manner as in 8-1, test no. Tests 8-2 to 8-5 were conducted. The dissolution rate is shown in Table 11 for each test.
- Test No. 5 (Test Nos. 8-6 to 8-10) Test No. 5 was used except that an ion exchange resin (SA10A, manufactured by Mitsubishi Chemical Corporation) was used as the metal recovery agent instead of the spray-dried sample, and that the metal elution solution shown in Table 11 was used. In the same manner as in 8-1, test no. Tests 8-6 to 8-10 were performed. The dissolution rate is shown in Table 11 for each test.
- SA10A manufactured by Mitsubishi Chemical Corporation
- Example 9 As Example 9, a palladium elution test was performed using a freeze-dried sample in which palladium was selectively recovered from a 5M aqueous solution.
- test no. The same test as in 9-1 and 9-2 was performed, and the metal concentration of the supernatant was measured (Test Nos. 9-1-control and 9-2-control). Next, the test No. measured as described above. 9-1 and test no. 9-1-From the difference in the metal concentration of the control, the test No. In 9-1, the metal concentration recovered in the lyophilized sample was calculated. Similarly, test no. 9-2 and test no. 9-2-2 From the difference in the metal concentration of the control, the test no. In 9-2, the metal concentration recovered in the freeze-dried sample was calculated.
- test no The freeze-dried sample fraction (precipitation fraction) collected by centrifugation in 9-1 and 9-2 is dissolved in 1 ml of 5M aqua regia solution, respectively, and the aqua regia solution is centrifuged (12,000 rpm, 1 minute). And washed. Next, 1 ml of 6M aqua regia as a metal elution solution was added to the freeze-dried sample fraction (precipitate fraction) obtained by centrifugation of the aqua regia solution, and stirred overnight at room temperature. The solution was centrifuged again (12,000 rpm, 1 minute), and the metal concentration of each obtained supernatant was measured using ICP-MS. The measured values are shown in Table 12 as the metal concentration of the eluate.
- Example 10 As Example 10, a selective recovery test of iridium from hydrochloric acid solution (0.1-1M) using a spray-dried sample was performed.
- Test No. 10-1 First, 20 mg of a spray-dried sample was added to 1 ml of a 0.1 M hydrochloric acid solution containing 10 ppm of Ir 3+ and stirred overnight at room temperature. Next, the hydrochloric acid solution was centrifuged (12,000 rpm, 1 minute), and the metal concentration of the obtained supernatant was measured using ICP-MS (Test No. 10-1). In addition, as a control test, Test No. 1 was used except that the spray-dried sample was not added. The same test as in 10-1 was performed, and the metal concentration of the supernatant was measured (Test No. 10-1-Control). Next, the test No. measured as described above. 10-1 and test no. 10-1- From the difference in the metal concentration of the control, the test No. The recovery rate at 10-1 was calculated. Table 14 shows the calculated recovery rate. The recoveries shown in Table 14 are average values ⁇ SD (standard deviation) of each of three independent tests.
- Test Nos. 10-2 to 10-4 Except for changing the concentration of the hydrochloric acid solution to the concentration shown in Table 14, test no. In the same manner as in 10-1, test no. Tests 10-2 to 10-4 were conducted. The calculated recovery rates for each test are shown in Table 14.
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Abstract
Description
本発明の金属又は金属化合物回収剤は、シアニディウム目の紅藻の細胞(以下、単に「細胞」ともいう)の乾燥物、シアニディウム目の紅藻の細胞由来物の乾燥物、又は前記細胞の乾燥物もしくは前記細胞由来物の乾燥物を模した人工物(以下、単に「人工物」ともいう)を含むものである。なお、「乾燥物を模して作製された人工物」とは、例えば、有機合成などにより作製されたもの等が挙げられる。
本発明の金属又は金属化合物の回収方法は、シアニディウム目の紅藻の細胞の乾燥物、シアニディウム目の紅藻の細胞由来物の乾燥物、又は前記細胞の乾燥物もしくは前記細胞由来物の乾燥物を模した人工物を金属溶液中に添加する添加工程と、乾燥物由来の細胞、乾燥物由来の細胞由来物、又は前記人工物に、金属溶液中に含まれる金属または金属化合物を吸着させる吸着工程とを少なくとも含むものである。
実施例1として、スプレードライ試料を用いた、塩酸溶液(0.5~6M)からの金とパラジウムの選択的回収試験を実施した。
定常期まで増殖させたG.sulphurariaの細胞を、遠心分離により回収した。次に、スプレードライヤを用いて、入口温度120度、出口温度77~82度、熱風量0.6m3/分、噴霧圧力100kPaの条件で、回収した細胞からスプレードライ試料(乾燥粉末)を作製した。なお、以降の説明において、「スプレードライ試料」とは、上記の方法によって作製した試料のことをいう。
まず、Au3+、Pd2+、及びCu2+をそれぞれ5ppm含む0.5M塩酸溶液1mlに、スプレードライ試料10mgを添加し、室温で15分間攪拌した。次に、該塩酸溶液を遠心分離(12,000rpm、1分)し、得られた上清の金属濃度を、ICP-MSを用いて測定した(試験No.1-2)。
塩酸溶液の濃度を、表1に示す濃度に変更したこと以外は、試験No.1-1又は1-2と同様の方法により、試験No.1-3乃至1-14の試験を実施した。それぞれの試験について、測定された金属濃度、及び回収率を表1に示す。
実施例2として、凍結乾燥試料を用いた、塩酸溶液(0.5~6M)からの金とパラジウムの選択的回収試験を実施した。
定常期まで増殖させたG.sulphurariaの細胞を、遠心分離により回収した。次に、回収した細胞を液体窒素によって凍結させた後、真空凍結乾燥処理を行い、凍結乾燥試料(乾燥粉末)を作製した。次に、Au3+、Pd2+、及びCu2+をそれぞれ5ppm含む0.5M塩酸溶液1mlに、上記で作製した凍結乾燥試料10mgを添加し、室温で15分間攪拌した。次に、該塩酸溶液を遠心分離(12,000rpm、1分)し、得られた上清の金属濃度を、ICP-MSを用いて測定した(試験No.2-2)。
塩酸溶液の濃度を、表2に示す濃度に変更したこと以外は、試験No.2-1又は2-2と同様の方法により、試験No.2-3乃至2-14の試験を実施した。それぞれの試験について、測定された金属濃度、及び回収率を表2に示す。
実施例3として、スプレードライ試料を用いた、4M王水からの金とパラジウムの選択的回収試験を実施した。
まず、Au3+、Pd2+、及びCu2+をそれぞれ5ppm含む4M王水溶液1mlに、スプレードライ試料15mgを添加し、室温で30分間攪拌した。次に、該王水溶液を遠心分離(12,000rpm、1分)し、得られた上清の金属濃度を、ICP-MSを用いて測定した(試験No.3-2)。
実施例4として、4M王水溶液から金とパラジウムを選択的に回収したスプレードライ試料を用いた、金とパラジウムの溶出試験を実施した。
まず、Au3+、Pd2+、及びCu2+をそれぞれ0.5ppm含む4M王水溶液1mlに、スプレードライ試料20mgを添加し、室温で30分間攪拌した。次に、該王水溶液を遠心分離(12,000rpm、1分)し、得られた上清の金属濃度を、ICP-MSを用いて測定した(試験No.4-2)。測定された上清の金属濃度を表4に示す。
4M王水溶液に含まれる各金属の濃度を、表4に示す濃度に変更したこと以外は、試験No.4-1又は4-2と同様の方法により、試験No.4-3乃至4-10の試験を実施した。それぞれの試験について、上清の金属濃度、スプレードライ試料に回収された金属濃度、溶出液の金属濃度、及び溶出率を、表4に示す。
実施例5として、スプレードライ試料を用いて、シアンと金を含む0.1mM KOH溶液(pH10)からの金の回収試験を実施した。0.1mM KOH溶液中では、Au3+イオンは、シアン化錯体として安定して存在している。
まず、1ppmの金を含む0.1mM KOH(pH10)1mlに、スプレードライ試料15mgを添加し、室温で30分間攪拌した。次に、該KOH溶液を遠心分離(12,000rpm、1分)し、得られた上清の金属濃度を、ICP-MSを用いて測定した(試験No.5-2)。
実施例6として、スプレードライ試料を用いた、塩酸溶液(1~4M)からのプラチナ、金、パラジウム、及びオスミウムの選択的回収試験を実施した。
まず、Rh3+、Pd2+、Os4+、Pt2+、Au3+、及びIr3+をそれぞれ10ppm含む1M塩酸溶液1mlに、スプレードライ試料10mgを添加し、一晩、室温で攪拌した。次に、該塩酸溶液を遠心分離(12,000rpm、1分)し、得られた上清の金属濃度を、ICP-MSを用いて測定した(試験No.6-2)。また、対照試験として、スプレードライ試料を添加しなかったこと以外は、試験No.6-2と同様の試験を行い、上清の金属濃度を測定した(試験No.6-1)。測定された金属濃度を、表6に示す。
塩酸溶液の濃度を、表6及び表7に示す濃度に変更したこと以外は、試験No.6-1又は6-2と同様の方法により、試験No.6-3乃至6-8の試験を実施した。それぞれの試験について、測定された金属濃度を表6に示し、回収率を表7に示す。
実施例7として、スプレードライ試料を用いた、塩酸溶液(1または2M)からのルテニウムの選択的回収試験を実施した。
まず、10ppmのRu3+を含む1M塩酸溶液1mlに、スプレードライ試料20mgを添加し、一晩、室温で攪拌した。次に、該塩酸溶液を遠心分離(12,000rpm、1分)し、得られた上清の金属濃度を、ICP-MSを用いて測定した(試験No.7-2)。また、対照試験として、スプレードライ試料を添加しなかったこと以外は、試験No.7-2と同様の試験を行い、上清の金属濃度を測定した(試験No.7-1)。測定された金属濃度を、表8に示す。
塩酸溶液の濃度を、表8に示す濃度に変更したこと以外は、試験No.7-1又は7-2と同様の方法により、試験No.7-3及び7-4の試験を実施した。それぞれの試験について、測定された金属濃度、及び回収率を表8に示す。
比較例1として、G.sulphurariaの生細胞を用いた、0.43M王水からの金属の選択的回収試験を実施した。
まず、871ppmのAu3+、86ppmのFe2+/3+、107ppmのCu2+、4.5ppmのPt4+、262ppmのNi2+、24ppmのSn2+を含む0.43M王水溶液1mlに、G.sulphurariaの生細胞14mg(乾燥重量)を添加し、室温で30分間攪拌した。次に、該王水溶液を遠心分離(12,000rpm、1分)し、得られた上清の金属濃度を、ICP-MSを用いて測定した(試験No.C1-2)。
比較例2として、G.sulphurariaの生細胞を用いた、4M王水からの金属の選択的回収試験を実施した。
まず、87ppmのFe2+/3+、56ppmのCu2+、9ppmのSn2+、3ppmのPt4+、912ppmのAu3+を含む4M王水溶液1mlに、G.sulphurariaの生細胞14mg(乾燥重量)を添加し、室温で30分間攪拌した。次に、該王水溶液を遠心分離(12,000rpm、1分)し、得られた上清の金属濃度を、ICP-MSを用いて測定した(試験No.C2-2)。
実施例8として、4M王水溶液から金を回収したスプレードライ試料及びイオン交換樹脂を用いた金の溶出試験を実施した。
まず、Au3+を10ppm含む4M王水溶液1mlに、スプレードライ試料20mgを添加し、室温で30分間攪拌した。次に、該王水溶液を遠心分離(12,000rpm、1分)し、得られた上清の金属濃度を、ICP-MSを用いて測定した(試験No.8-1)。また、スプレードライ試料を添加しなかったこと以外は、試験No.8-1と同様の試験を行い、上清の金属濃度を測定した(試験No.8-1-対照)。次に、上記で測定された試験No.8-1と試験No.8-1-対照の金属濃度の差から、試験No.8-1においてスプレードライ試料に回収された金属濃度を算出した。
金属溶出用溶液として、4M HClに代えて、0.5M EDTA(pH8)(試験No.8-2)、1M Thiourea/0.1M HCl(試験No.8-3)、1M KOH(試験No.8-4)、又は6M王水(試験No.8-5)を用いたこと以外は、試験No.8-1と同様の方法により、試験No.8-2乃至8-5の試験を実施した。それぞれの試験について、溶出率を表11に示す。
金属回収剤として、スプレードライ試料に代えて、イオン交換樹脂(SA10A,三菱ケミカル社製)を用いたこと、及び金属溶出用溶液として、表11に示すものを用いたこと以外は、試験No.8-1と同様の方法により、試験No.8-6乃至8-10の試験を実施した。それぞれの試験について、溶出率を表11に示す。
実施例9として、5M王水溶液からパラジウムを選択的に回収した凍結乾燥試料を用いた、パラジウムの溶出試験を実施した。
まず、Pd2+、Al3+、Cd2+、Fe2+/3+、Mn2+、Pb2+、Zn2+をそれぞれ10ppm含む5M王水溶液30mlに、凍結乾燥試料120mgを添加し、室温で30分間攪拌した。次に、当該王水溶液を10ml(試験No.9-1,濃縮倍率10倍)と20ml(試験No.9-2,濃縮倍率20倍)に分け、遠心分離(12,000rpm、1分)し、得られたそれぞれの上清の金属濃度を、ICP-MSを用いて測定した(試験No.9-1及び9-2)。また、凍結乾燥試料を添加しなかったこと以外は、試験No.9-1及び9-2と同様の試験を行い、上清の金属濃度を測定した(試験No.9-1-対照及び9-2-対照)。次に、上記で測定された試験No.9-1と試験No.9-1-対照の金属濃度の差から、試験No.9-1において凍結乾燥試料に回収された金属濃度を算出した。同様に、試験No.9-2と試験No.9-2-対照の金属濃度の差から、試験No.9-2において凍結乾燥試料に回収された金属濃度を算出した。
実施例10として、スプレードライ試料を用いた、塩酸溶液(0.1-1M)からのイリジウムの選択的回収試験を実施した。
まず、10ppmのIr3+を含む0.1M塩酸溶液1mlに、スプレードライ試料20mgを添加し、室温で一晩攪拌した。次に、該塩酸溶液を遠心分離(12,000rpm、1分)し、得られた上清の金属濃度を、ICP-MSを用いて測定した(試験No.10-1)。また、対照試験として、スプレードライ試料を添加しなかったこと以外は、試験No.10-1と同様の試験を行い、上清の金属濃度を測定した(試験No.10-1-対照)。次に、上記で測定された試験No.10-1と試験No.10-1-対照の金属濃度の差から、試験No.10-1における回収率を算出した。算出された回収率を表14に示す。なお、表14に示す回収率は、3つの独立した試験それぞれの平均値±SD(標準偏差)である。
塩酸溶液の濃度を、表14に示す濃度に変更したこと以外は、試験No.10-1と同様の方法により、試験No.10-2乃至10-4の試験を実施した。それぞれの試験について、算出された回収率を表14に示す。
Claims (8)
- シアニディウム目の紅藻の細胞の乾燥物、シアニディウム目の紅藻の細胞由来物の乾燥物、又は前記細胞の乾燥物もしくは前記細胞由来物の乾燥物を模した人工物を含む、金属回収剤又は金属化合物回収剤。
- シアニディウム目の紅藻の細胞の乾燥物、シアニディウム目の紅藻の細胞由来物の乾燥物、又は前記細胞の乾燥物もしくは前記細胞由来物の乾燥物を模した人工物を金属溶液中に添加する添加工程と、
乾燥物由来の細胞、乾燥物由来の細胞由来物、又は前記人工物に、金属溶液中に含まれる金属または金属化合物を吸着させる吸着工程と、
を含む、金属又は金属化合物の回収方法。 - 添加工程における乾燥物又は人工物の添加量が、金属溶液100mlに対して、0.001mg以上である、請求項2に記載の金属又は金属化合物の回収方法。
- 吸着工程が、金属溶液中に含まれる金、パラジウム、ルテニウム、プラチナ、イリジウム、及びオスミウムからなる群より選択される1以上の金属又は該金属を含む金属化合物を選択的に吸着する工程である、
請求項2又は3に記載の金属又は金属化合物の回収方法。 - 金属溶液の酸濃度が、0.5mmol/L以上である、
請求項2~4のいずれかに記載の金属又は金属化合物の回収方法。 - 吸着工程が、金属溶液中に含まれるシアン化金錯体を回収する工程である、
請求項2又は3に記載の金属又は金属化合物の回収方法。 - さらに、乾燥物由来の細胞、乾燥物由来の細胞由来物、又は前記人工物に吸着された金属または金属化合物を、精製する工程を含む、
請求項2~6のいずれかに記載の金属又は金属化合物の回収方法。 - さらに、乾燥物由来の細胞、乾燥物由来の細胞由来物、又は前記人工物に吸着された金属または金属化合物を、アンモニア及びアンモニウム塩を含む混合溶液を用いて溶出させる溶出工程を含む、
請求項2~6のいずれかに記載の金属又は金属化合物の回収方法。
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CN202410529295.5A CN118547164A (zh) | 2017-02-27 | 2018-02-26 | 金属回收剂、金属化合物回收剂及金属或金属化合物的回收方法 |
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