JP6453735B2 - 貴金属粉末の製造方法 - Google Patents
貴金属粉末の製造方法 Download PDFInfo
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- JP6453735B2 JP6453735B2 JP2015185231A JP2015185231A JP6453735B2 JP 6453735 B2 JP6453735 B2 JP 6453735B2 JP 2015185231 A JP2015185231 A JP 2015185231A JP 2015185231 A JP2015185231 A JP 2015185231A JP 6453735 B2 JP6453735 B2 JP 6453735B2
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- Prior art keywords
- noble metal
- aqueous solution
- calcium
- hydroxide
- metal powder
- Prior art date
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- 229910000510 noble metal Inorganic materials 0.000 title claims description 118
- 238000004519 manufacturing process Methods 0.000 title claims description 46
- 239000000843 powder Substances 0.000 title claims description 42
- 239000007864 aqueous solution Substances 0.000 claims description 95
- 230000002378 acidificating effect Effects 0.000 claims description 47
- 238000010438 heat treatment Methods 0.000 claims description 32
- 150000002736 metal compounds Chemical class 0.000 claims description 27
- 229940043430 calcium compound Drugs 0.000 claims description 25
- 150000001674 calcium compounds Chemical class 0.000 claims description 25
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 24
- 239000000920 calcium hydroxide Substances 0.000 claims description 23
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 21
- 238000010306 acid treatment Methods 0.000 claims description 18
- 229910000000 metal hydroxide Inorganic materials 0.000 claims description 17
- 239000007787 solid Substances 0.000 claims description 16
- 150000004706 metal oxides Chemical class 0.000 claims description 14
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical group [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 11
- 239000012298 atmosphere Substances 0.000 claims description 8
- 239000012295 chemical reaction liquid Substances 0.000 claims description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 41
- 239000002245 particle Substances 0.000 description 31
- 239000002253 acid Substances 0.000 description 26
- 239000002923 metal particle Substances 0.000 description 16
- 239000000243 solution Substances 0.000 description 16
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 14
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 14
- 238000000034 method Methods 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 13
- 238000009826 distribution Methods 0.000 description 12
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 11
- 239000000292 calcium oxide Substances 0.000 description 11
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 11
- 238000001035 drying Methods 0.000 description 11
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 11
- 239000007788 liquid Substances 0.000 description 11
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 10
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 10
- 239000001110 calcium chloride Substances 0.000 description 10
- 229910001628 calcium chloride Inorganic materials 0.000 description 10
- 229910052697 platinum Inorganic materials 0.000 description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 8
- 239000011575 calcium Substances 0.000 description 8
- 229910052791 calcium Inorganic materials 0.000 description 8
- 239000010931 gold Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- 238000005406 washing Methods 0.000 description 8
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 7
- 229910052737 gold Inorganic materials 0.000 description 7
- 150000004692 metal hydroxides Chemical class 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910017604 nitric acid Inorganic materials 0.000 description 6
- 239000011362 coarse particle Substances 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 229910001424 calcium ion Inorganic materials 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000012299 nitrogen atmosphere Substances 0.000 description 4
- 239000010970 precious metal Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000010948 rhodium Substances 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229910052763 palladium Inorganic materials 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- -1 platinum ions Chemical class 0.000 description 3
- 230000009467 reduction Effects 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
- 238000000926 separation method Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000004438 BET method Methods 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000003929 acidic solution Substances 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- WTDHULULXKLSOZ-UHFFFAOYSA-N hydroxylamine hydrochloride Substances Cl.ON WTDHULULXKLSOZ-UHFFFAOYSA-N 0.000 description 2
- WCYJQVALWQMJGE-UHFFFAOYSA-M hydroxylammonium chloride Chemical compound [Cl-].O[NH3+] WCYJQVALWQMJGE-UHFFFAOYSA-M 0.000 description 2
- 229910052741 iridium Inorganic materials 0.000 description 2
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052707 ruthenium Inorganic materials 0.000 description 2
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- WRUZSAOKBCCMCQ-UHFFFAOYSA-H Cl[Rh](Cl)(Cl)(Cl)(Cl)Cl.N Chemical compound Cl[Rh](Cl)(Cl)(Cl)(Cl)Cl.N WRUZSAOKBCCMCQ-UHFFFAOYSA-H 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001111 Fine metal Inorganic materials 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 239000004280 Sodium formate Substances 0.000 description 1
- RGUISPKPDVJPTB-UHFFFAOYSA-N [Pt].[Ca] Chemical compound [Pt].[Ca] RGUISPKPDVJPTB-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 125000000218 acetic acid group Chemical group C(C)(=O)* 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- BIVUUOPIAYRCAP-UHFFFAOYSA-N aminoazanium;chloride Chemical compound Cl.NN BIVUUOPIAYRCAP-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- WIDMMNCAAAYGKW-UHFFFAOYSA-N azane;palladium(2+);dinitrate Chemical compound N.N.N.N.[Pd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O WIDMMNCAAAYGKW-UHFFFAOYSA-N 0.000 description 1
- NOWPEMKUZKNSGG-UHFFFAOYSA-N azane;platinum(2+) Chemical compound N.N.N.N.[Pt+2] NOWPEMKUZKNSGG-UHFFFAOYSA-N 0.000 description 1
- WPEJSSRSFRWYJB-UHFFFAOYSA-K azanium;tetrachlorogold(1-) Chemical compound [NH4+].[Cl-].[Cl-].[Cl-].[Cl-].[Au+3] WPEJSSRSFRWYJB-UHFFFAOYSA-K 0.000 description 1
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 1
- 229910001863 barium hydroxide Inorganic materials 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- ZAZYUFWBENXXPV-UHFFFAOYSA-N calcium gold Chemical compound [Ca].[Au] ZAZYUFWBENXXPV-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- HTXDPTMKBJXEOW-UHFFFAOYSA-N dioxoiridium Chemical compound O=[Ir]=O HTXDPTMKBJXEOW-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 150000002344 gold compounds Chemical class 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000033444 hydroxylation Effects 0.000 description 1
- 238000005805 hydroxylation reaction Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 150000002504 iridium compounds Chemical class 0.000 description 1
- 229910000457 iridium oxide Inorganic materials 0.000 description 1
- GSNZLGXNWYUHMI-UHFFFAOYSA-N iridium(3+);trinitrate Chemical compound [Ir+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O GSNZLGXNWYUHMI-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 150000002941 palladium compounds Chemical class 0.000 description 1
- GPNDARIEYHPYAY-UHFFFAOYSA-N palladium(ii) nitrate Chemical compound [Pd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O GPNDARIEYHPYAY-UHFFFAOYSA-N 0.000 description 1
- 150000003058 platinum compounds Chemical class 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 150000003284 rhodium compounds Chemical class 0.000 description 1
- VXNYVYJABGOSBX-UHFFFAOYSA-N rhodium(3+);trinitrate Chemical compound [Rh+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VXNYVYJABGOSBX-UHFFFAOYSA-N 0.000 description 1
- 150000003304 ruthenium compounds Chemical class 0.000 description 1
- GTCKPGDAPXUISX-UHFFFAOYSA-N ruthenium(3+);trinitrate Chemical compound [Ru+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O GTCKPGDAPXUISX-UHFFFAOYSA-N 0.000 description 1
- YBCAZPLXEGKKFM-UHFFFAOYSA-K ruthenium(iii) chloride Chemical compound [Cl-].[Cl-].[Cl-].[Ru+3] YBCAZPLXEGKKFM-UHFFFAOYSA-K 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- CQLFBEKRDQMJLZ-UHFFFAOYSA-M silver acetate Chemical compound [Ag+].CC([O-])=O CQLFBEKRDQMJLZ-UHFFFAOYSA-M 0.000 description 1
- 229940071536 silver acetate Drugs 0.000 description 1
- 229940100890 silver compound Drugs 0.000 description 1
- 150000003379 silver compounds Chemical class 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 description 1
- 235000019254 sodium formate Nutrition 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- DANYXEHCMQHDNX-UHFFFAOYSA-K trichloroiridium Chemical compound Cl[Ir](Cl)Cl DANYXEHCMQHDNX-UHFFFAOYSA-K 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/142—Thermal or thermo-mechanical treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0466—Alloys based on noble metals
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C5/00—Alloys based on noble metals
- C22C5/02—Alloys based on gold
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C5/00—Alloys based on noble metals
- C22C5/04—Alloys based on a platinum group metal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/052—Metallic powder characterised by the size or surface area of the particles characterised by a mixture of particles of different sizes or by the particle size distribution
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2201/00—Treatment under specific atmosphere
- B22F2201/01—Reducing atmosphere
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2201/00—Treatment under specific atmosphere
- B22F2201/10—Inert gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/25—Noble metals, i.e. Ag Au, Ir, Os, Pd, Pt, Rh, Ru
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C5/00—Alloys based on noble metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
Description
本発明の製造方法においては、まず、1種以上の貴金属化合物(以下、単に貴金属化合物ともいう)とカルシウム化合物の酸性水溶液を調製する。
本発明の製造方法においては、次に、上記のようにして調製した酸性水溶液を塩基性水溶液に添加して、貴金属の酸化物、水酸化物又はそれらの混合物、及び水酸化カルシウムを生成させる。
本発明の製造方法においては、上記反応工程につづいて、還元剤により前記貴金属の酸化物、水酸化物又はそれらの混合物を還元する。すなわち、上記反応工程により得られた貴金属の酸化物、水酸化物又はそれらの混合物、及び水酸化カルシウムを含む液体に還元剤を添加して、液体中の貴金属の酸化物、水酸化物又はそれらの混合物を還元させる。
つづいて、本発明の製造方法においては、貴金属の酸化物、水酸化物又はそれらの混合物を還元した後の液体から、貴金属の還元体を含む固形分(不溶解物)を分離し、これを熱処理(焼成)する。ここで、本発明の製造方法においては、上記反応工程において貴金属の酸化物、水酸化物又はそれらの混合物と水酸化カルシウムとが均一に分散した液体を得た後、還元工程を経て、固形分(不溶解物)を分離している。したがって、分離された固形分においては、貴金属の還元体と水酸化カルシウムが均一に分散された状態で含まれている。この固形分に熱処理を施すことにより、貴金属の還元体は原子価0の状態で半融状態となり凝集していく。一方、共存する水酸化カルシウムは熱分解して酸化カルシウムとなる。形態的には、貴金属の還元体は原子価0の状態で半融状態となり凝集していくが、熱的に安定な固体である酸化カルシウムに囲まれて凝集が妨げられ、凝集貴金属の周囲を取囲むように酸化カルシウムが配置された状態になる。このように、貴金属の還元体と水酸化カルシウムが均一に分散された状態から、貴金属粒子が自由に成長し得ない環境で粒成長させることにより、貴金属粒子径が均一に揃えられ、粒径分布範囲が狭く、高純度かつ高結晶性の貴金属粒子を得ることができる。
本発明の製造方法においては、前記熱処理工程の後に、熱処理に供した熱処理物に対して酸処理をさらに施すことが好ましい。ここで、上記熱処理に供した熱処理物には、貴金属粒子と酸化カルシウムが含まれるが、酸処理によって、貴金属粒子(粉末)のみを残して、酸化カルシウムのみを酸に溶解させ、貴金属粉末以外の成分を除去することができる。
塩化カルシウム55.5gを200gの純水に溶解させて、塩化カルシウム水溶液を調製した。次に、塩化白金酸溶液(白金含有率16.4重量%)243.9gを、調製した塩化カルシウム水溶液に加えて十分に撹拌し、白金イオンとカルシウムイオンを含む酸性水溶液を調製した。50℃に加熱した500gの40%水酸化カリウム水溶液を撹拌しているところに、当該酸性水溶液を10分間かけて滴下した。次に、5%ヒドラジンを200g添加し、さらに1時間攪拌してから室温に冷却した後、不溶解物を濾別した。濾別された不溶解物を洗浄した後、120℃で乾燥させ、窒素雰囲気下1200℃で1時間熱処理を施した。つづいて、3mol/Lの硝酸溶液を1L用意し、これに熱処理物を加えて酸処理し、カルシウム成分を溶解除去した後、洗浄及び120℃で乾燥させて、白金粉末39.4gを得た。図1に、実施例1で得られた白金粉末のSEM写真を示す。
塩化カルシウム55.5gを200gの純水に溶解させて、塩化カルシウム水溶液を調製した。次に、塩化白金酸溶液(白金含有率16.4重量%)243.9gを、調製した塩化カルシウム水溶液に加えて十分に撹拌し、白金イオンとカルシウムイオンを含む酸性水溶液を調製した。前記酸性水溶液を50℃に加熱しながら攪拌しているところに、500gの40%水酸化カリウム水溶液を10分間かけて滴下した。次に、5%ヒドラジンを200g添加し、さらに1時間攪拌してから室温に冷却した後、不溶解物を濾別した。濾別された不溶解物を洗浄した後、120℃で乾燥させ、窒素雰囲気下1200℃で1時間熱処理を施した。つづいて、3mol/Lの硝酸溶液を1L用意し、これに熱処理物を加えて酸処理し、カルシウム成分を溶解除去した後、洗浄及び120℃で乾燥させて、白金粉末39.4gを得た。図2に、比較例1で得られた白金粉末のSEM写真を示す。
水酸化カルシウム148.2gを500gの純水に分散させ、水酸化カルシウムスラリーを調製した。この水酸化カルシウムスラリーに対して、塩化白金酸溶液(白金含有率16.4重量%)243.9gに純水を200g加えて混合した溶液を10分間かけて滴下した。次に、5%ヒドラジンを200g添加し、さらに1時間攪拌してから室温に冷却した後、不溶解物を濾別した。濾別された不溶解物を洗浄した後、120℃で乾燥させ、窒素雰囲気下1200℃で1時間熱処理を施した。つづいて、3mol/Lの硝酸溶液を1L用意し、これに熱処理物を加えて酸処理し、カルシウム成分を溶解除去した後、洗浄及び120℃で乾燥させて、白金粉末39.4gを得た。図3に、比較例2で得られた白金粉末のSEM写真を示す。
硝酸カルシウム36.1gを36gの純水に溶解させて、硝酸カルシウム水溶液を調製した。次に、塩化金酸溶液(金含有率17.0重量%)35.3gを、調製した硝酸カルシウム水溶液に加えて十分に撹拌し、金イオンとカルシウムイオンを含む酸性水溶液を調製した。50℃に加熱した248gの40%水酸化カルシウム水溶液を撹拌しているところに、当該酸性水溶液を80分間かけて滴下した。次に、10%塩酸ヒドラジンを17.1g添加し、さらに1時間攪拌してから室温に冷却した後、不溶解物を濾別した。濾別された不溶解物を洗浄した後、120℃で乾燥させ、窒素雰囲気下800℃で1時間熱処理を施した。つづいて、3mol/Lの硝酸溶液を1L用意し、これに熱処理物を加えて酸処理し、カルシウム成分を溶解除去した後、洗浄及び120℃で乾燥させて、金粉末6.0gを得た。図4に、実施例2で得られた金粉末のSEM写真を示す。
Claims (7)
- 1種以上の貴金属化合物とカルシウム化合物の酸性水溶液を調製する工程、
前記酸性水溶液を塩基性水溶液に添加し、貴金属の酸化物、水酸化物又はそれらの混合物、及び水酸化カルシウムを生成させる工程、
還元剤により前記貴金属の酸化物、水酸化物又はそれらの混合物を還元する工程、及び、
貴金属の還元体を含む固形分を分離して熱処理する工程
を含む貴金属粉末の製造方法。 - 前記熱処理する工程の後、得られた熱処理物に酸処理を施す工程をさらに含む、請求項1に記載の貴金属粉末の製造方法。
- 前記酸性水溶液を調製する際の、前記1種以上の貴金属化合物と前記カルシウム化合物の割合が、原子基準に換算した重量比(貴金属原子:カルシウム原子)で、10:1〜0.2:1である、請求項1または2に記載の貴金属粉末の製造方法。
- 前記酸性水溶液を前記塩基性水溶液に滴下することにより添加する、請求項1から3のいずれか1項に記載の貴金属粉末の製造方法。
- 前記酸性水溶液の全量を前記塩基性水溶液に添加した後の反応液が塩基性である、請求項1から4のいずれか1項に記載の貴金属粉末の製造方法。
- 前記熱処理が800℃以上の温度で行われる、請求項1から5のいずれか1項に記載の貴金属粉末の製造方法。
- 前記熱処理が不活性雰囲気下又は還元性雰囲気下で行われる、請求項1から6のいずれか1項に記載の貴金属粉末の製造方法。
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