WO2014038236A1 - 黄鉄鉱を含有する金鉱石からの金の浸出方法 - Google Patents
黄鉄鉱を含有する金鉱石からの金の浸出方法 Download PDFInfo
- Publication number
- WO2014038236A1 WO2014038236A1 PCT/JP2013/060797 JP2013060797W WO2014038236A1 WO 2014038236 A1 WO2014038236 A1 WO 2014038236A1 JP 2013060797 W JP2013060797 W JP 2013060797W WO 2014038236 A1 WO2014038236 A1 WO 2014038236A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gold
- leaching
- ore
- pyrite
- gold leaching
- Prior art date
Links
- 239000010931 gold Substances 0.000 title claims abstract description 180
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 173
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 172
- 238000002386 leaching Methods 0.000 title claims abstract description 120
- 239000011028 pyrite Substances 0.000 title claims abstract description 51
- 229910052683 pyrite Inorganic materials 0.000 title claims abstract description 51
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 50
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 30
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 28
- -1 iron ions Chemical class 0.000 claims abstract description 22
- 229910052742 iron Inorganic materials 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 230000001590 oxidative effect Effects 0.000 claims abstract description 14
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 claims abstract description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 12
- 239000012298 atmosphere Substances 0.000 claims abstract description 12
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000007800 oxidant agent Substances 0.000 claims abstract description 11
- 230000003647 oxidation Effects 0.000 claims abstract description 11
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 11
- 238000005979 thermal decomposition reaction Methods 0.000 claims description 15
- 229910052717 sulfur Inorganic materials 0.000 claims description 12
- 239000011593 sulfur Substances 0.000 claims description 12
- 229910021607 Silver chloride Inorganic materials 0.000 claims description 7
- 230000033116 oxidation-reduction process Effects 0.000 claims description 7
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract description 8
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052736 halogen Inorganic materials 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 5
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 abstract description 4
- 150000002367 halogens Chemical class 0.000 abstract description 4
- 238000002203 pretreatment Methods 0.000 abstract description 4
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 abstract description 4
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 abstract 2
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 231100000614 poison Toxicity 0.000 abstract 1
- 230000007096 poisonous effect Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 25
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 23
- 239000012141 concentrate Substances 0.000 description 17
- 238000006243 chemical reaction Methods 0.000 description 16
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 description 12
- 239000007789 gas Substances 0.000 description 11
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 239000007788 liquid Substances 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 8
- 229910001431 copper ion Inorganic materials 0.000 description 8
- 238000011282 treatment Methods 0.000 description 8
- 238000003801 milling Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 229910052569 sulfide mineral Inorganic materials 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 239000012299 nitrogen atmosphere Substances 0.000 description 6
- 238000000197 pyrolysis Methods 0.000 description 6
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 6
- 229910021591 Copper(I) chloride Inorganic materials 0.000 description 5
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 5
- 238000007664 blowing Methods 0.000 description 5
- OXBLHERUFWYNTN-UHFFFAOYSA-M copper(I) chloride Chemical compound [Cu]Cl OXBLHERUFWYNTN-UHFFFAOYSA-M 0.000 description 5
- 229940045803 cuprous chloride Drugs 0.000 description 5
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 5
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 5
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- QTMDXZNDVAMKGV-UHFFFAOYSA-L copper(ii) bromide Chemical compound [Cu+2].[Br-].[Br-] QTMDXZNDVAMKGV-UHFFFAOYSA-L 0.000 description 4
- GYCHYNMREWYSKH-UHFFFAOYSA-L iron(ii) bromide Chemical compound [Fe+2].[Br-].[Br-] GYCHYNMREWYSKH-UHFFFAOYSA-L 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910000510 noble metal Inorganic materials 0.000 description 4
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- ODWXUNBKCRECNW-UHFFFAOYSA-M bromocopper(1+) Chemical compound Br[Cu+] ODWXUNBKCRECNW-UHFFFAOYSA-M 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 229960003280 cupric chloride Drugs 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 235000013980 iron oxide Nutrition 0.000 description 3
- 229910001509 metal bromide Inorganic materials 0.000 description 3
- 229910001510 metal chloride Inorganic materials 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910021590 Copper(II) bromide Inorganic materials 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000001342 alkaline earth metals Chemical class 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- 229910052790 beryllium Inorganic materials 0.000 description 2
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 2
- 229940006460 bromide ion Drugs 0.000 description 2
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
- 229910052794 bromium Inorganic materials 0.000 description 2
- 150000001649 bromium compounds Chemical class 0.000 description 2
- 229910052792 caesium Inorganic materials 0.000 description 2
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 150000001805 chlorine compounds Chemical class 0.000 description 2
- OMZSGWSJDCOLKM-UHFFFAOYSA-N copper(II) sulfide Chemical compound [S-2].[Cu+2] OMZSGWSJDCOLKM-UHFFFAOYSA-N 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910052730 francium Inorganic materials 0.000 description 2
- KLMCZVJOEAUDNE-UHFFFAOYSA-N francium atom Chemical compound [Fr] KLMCZVJOEAUDNE-UHFFFAOYSA-N 0.000 description 2
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002354 inductively-coupled plasma atomic emission spectroscopy Methods 0.000 description 2
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052952 pyrrhotite Inorganic materials 0.000 description 2
- 229910052705 radium Inorganic materials 0.000 description 2
- HCWPIIXVSYCSAN-UHFFFAOYSA-N radium atom Chemical compound [Ra] HCWPIIXVSYCSAN-UHFFFAOYSA-N 0.000 description 2
- 229910052701 rubidium Inorganic materials 0.000 description 2
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 2
- 238000002076 thermal analysis method Methods 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- FEONEKOZSGPOFN-UHFFFAOYSA-K tribromoiron Chemical compound Br[Fe](Br)Br FEONEKOZSGPOFN-UHFFFAOYSA-K 0.000 description 2
- BMYNFMYTOJXKLE-UHFFFAOYSA-N 3-azaniumyl-2-hydroxypropanoate Chemical compound NCC(O)C(O)=O BMYNFMYTOJXKLE-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910021589 Copper(I) bromide Inorganic materials 0.000 description 1
- 229910021575 Iron(II) bromide Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- INJRKJPEYSAMPD-UHFFFAOYSA-N aluminum;silicic acid;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O INJRKJPEYSAMPD-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- AQLMHYSWFMLWBS-UHFFFAOYSA-N arsenite(1-) Chemical compound O[As](O)[O-] AQLMHYSWFMLWBS-UHFFFAOYSA-N 0.000 description 1
- NFMAZVUSKIJEIH-UHFFFAOYSA-N bis(sulfanylidene)iron Chemical compound S=[Fe]=S NFMAZVUSKIJEIH-UHFFFAOYSA-N 0.000 description 1
- SXDBWCPKPHAZSM-UHFFFAOYSA-N bromic acid Chemical compound OBr(=O)=O SXDBWCPKPHAZSM-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 229910052951 chalcopyrite Inorganic materials 0.000 description 1
- DVRDHUBQLOKMHZ-UHFFFAOYSA-N chalcopyrite Chemical compound [S-2].[S-2].[Fe+2].[Cu+2] DVRDHUBQLOKMHZ-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- NKNDPYCGAZPOFS-UHFFFAOYSA-M copper(i) bromide Chemical compound Br[Cu] NKNDPYCGAZPOFS-UHFFFAOYSA-M 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005363 electrowinning Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229940046149 ferrous bromide Drugs 0.000 description 1
- 229960002089 ferrous chloride Drugs 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 229910052949 galena Inorganic materials 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000020169 heat generation Effects 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
- 229910052595 hematite Inorganic materials 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- 229910000042 hydrogen bromide Inorganic materials 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- GNVXPFBEZCSHQZ-UHFFFAOYSA-N iron(2+);sulfide Chemical compound [S-2].[Fe+2] GNVXPFBEZCSHQZ-UHFFFAOYSA-N 0.000 description 1
- 229910052850 kyanite Inorganic materials 0.000 description 1
- 239000010443 kyanite Substances 0.000 description 1
- RLJMLMKIBZAXJO-UHFFFAOYSA-N lead nitrate Chemical compound [O-][N+](=O)O[Pb]O[N+]([O-])=O RLJMLMKIBZAXJO-UHFFFAOYSA-N 0.000 description 1
- XCAUINMIESBTBL-UHFFFAOYSA-N lead(ii) sulfide Chemical compound [Pb]=S XCAUINMIESBTBL-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910052950 sphalerite Inorganic materials 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
Images
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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting 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
-
- 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 method for leaching gold from gold ore containing pyrite.
- a technique using a wet method is known as a method for recovering gold from sulfide minerals containing gold.
- leaching of gold in sulfide minerals into solutions has been performed by using chemicals such as cyanide, thiourea, thiosulfuric acid, and halogen gas.
- leaching agents having lower toxicity chloride ions, iron ions, as described in JP-A-2008-106347 (Patent Document 1) and JP-A-2009-235525 (Patent Document 2), It has also been proposed to use a gold leaching solution utilizing copper ions and bromide ions.
- Patent Document 3 Japanese Patent Application Laid-Open No. 2010-235999 (Patent Document 3), copper sulfide mineral is leached at a temperature lower than the melting point of sulfur, and sulfur obtained into fine particles from the obtained leaching residue and remains without leaching. Sulfide particles are levitated by utilizing the difference in hydrophobicity from other iron oxides and gangue components, while iron oxide and gangue components are settled or separated as sedimentation to separate them in the leach residue. Concentrate the gold contained in the. After that, the concentrated gold-containing component is oxidized and roasted after removing sulfur to convert the iron component to iron oxide (hematite), and then dissolved using sulfuric acid to recover the gold-enriched residue. Is done.
- JP 2005-042155 A proposes a method of removing pyrite from the residue, increasing the content ratio of the noble metal contained therein, and concentrating it.
- Patent Document 2 gold can be easily leached without using chemicals such as highly toxic cyanide, thiourea, thiosulfuric acid, and halogen gas. Although it is very practical for gold leaching, the gold leaching rate is insufficient when it is applied to pyrite.
- Patent Document 3 pretreatment using oxidation roasting performed by supplying oxygen as described in JP 2010-235999 A (Patent Document 3) removes sulfur in advance and facilitates iron leaching. A method is also conceivable.
- Patent Document 4 is a process based on the premise that the noble metal is recovered by a dry process in view of the problem in the method of recovering the noble metal by a wet method, and it is assumed that the noble metal is leached by a wet process. (See paragraphs 0007 to 0008, 0078, etc. of Patent Document 4). In addition, there is no suggestion of what effect can be obtained by wet processing.
- the method of pretreating pyrite by thermal reaction can generate iron soluble in acid by removing sulfur content, but harmful gas is generated during thermal reaction or dissolution of iron.
- pyrite is leached and removed, which contributes to the improvement of the gold quality of the raw material, but it is necessary to smelt gold separately.
- the present invention has been made in view of the above circumstances, and in the method of leaching gold from gold ore containing pyrite, without using chemicals such as highly toxic cyanide, thiourea, thiosulfuric acid, halogen gas, and the like.
- An object of the present invention is to provide an efficient gold leaching method by improving the gold leaching rate while suppressing the generation of sulfur dioxide.
- the present inventor has intensively studied to solve the above problems, and after performing a pretreatment of pyrite pyrolyzing into iron (II) sulfide in a non-oxidizing atmosphere, halide ions and trivalent iron are performed. It has been found that when gold leaching is performed using a gold leaching solution containing ions, the gold leaching rate is dramatically improved while suppressing the generation of sulfur oxide.
- Step 1 for preparing gold ore containing pyrite, and heating the gold ore to 450 ° C. or higher in a non-oxidizing atmosphere Including a step 2 of thermally decomposing pyrite in gold ore into iron (II) sulfide and elemental sulfur, and a pretreatment not including an oxidation roasting step; Contacting the gold ore after the pretreatment step with a gold leaching solution containing halide ions and iron ions under supply of an oxidizing agent, and leaching the gold component in the ore; and This is a gold leaching method.
- the gold leaching solution contains chloride ions and bromide ions.
- the gold leaching in the step 3 is performed under the condition that the oxidation-reduction potential (the reference electrode is silver / silver chloride) is maintained at 550 mV or more.
- the thermal decomposition in step 2 is performed under the condition that the gold ore is held at 600 to 750 ° C. for 5 to 60 minutes.
- the content of pyrite in the gold ore is 5 to 80% by mass.
- gaseous single sulfur generated in step 2 is removed from the gold ore by solid-gas separation.
- the iron (II) sulfide and elemental sulfur generated in step 2 are cooled and recovered together in solid form and brought into contact with the gold leaching solution together. To carry out the gold leaching process.
- the gold leaching step is performed while maintaining the pH of the gold leaching solution at 1.9 or lower.
- Gold ore containing pyrite is drastically improved while suppressing the generation of harmful sulfur oxides by performing gold leaching using a specific gold leaching solution after performing the pretreatment method according to the present invention.
- Gold leaching rate can be obtained. That is, according to the present invention, it is possible to provide an extremely practical gold leaching method that is excellent in safety and environmental conservation.
- step 1 for preparing gold ore containing pyrite, and heating the gold ore to 450 ° C or higher in a non-oxidizing atmosphere, Including the step 2 of thermally decomposing pyrite in the gold ore into iron sulfide (II) and elemental sulfur, and not including the oxidation roasting step.
- step 2 for thermally decomposing pyrite in the gold ore into iron sulfide (II) and elemental sulfur, and not including the oxidation roasting step.
- Step 1 gold ore containing pyrite is prepared. This is because the purpose of the present invention is to increase the gold leaching rate in pyrite, which is hardly soluble and has a low gold leaching rate. However, other requirements such as the concentration of gold in the ore are not important.
- the gold ore to be treated in the present invention may be subjected to a conventional beneficiation process such as flotation or specific gravity sorting. Grinding can reduce the particle size of the ore so that the gold leachate can easily come into contact with the gold inside the ore.
- the gold concentration in the gold ore is typically about 0.1 to 100 ppm by mass, and more typically about 1 to 20 ppm by mass.
- the gold ore may contain chalcopyrite, galena, sphalerite, arsenite, kyanite, pyrrhotite, etc., but in an exemplary embodiment of the present invention pyrite Is used, and in a more typical embodiment of the present invention, a gold ore containing 30% by mass or more of pyrite is used. By using such gold ore, the effect of the pretreatment according to the present invention is remarkably exhibited.
- the content of pyrite in the gold ore is not particularly limited, and may be 100% by mass, but typically 80% by mass or less.
- an oxidation roasting step is not included.
- oxidation roasting was performed in the presence of oxygen or air, so sulfur in the sulfide mineral was combined with oxygen to produce sulfur oxide.
- such an oxidation roasting step is not performed.
- Step 2 the gold ore is heated to 450 ° C. or higher in a non-oxidizing atmosphere, and pyrite in the gold ore is thermally decomposed into iron sulfide (II) and elemental sulfur.
- the chemical reaction at this time is represented by the following formula: FeS 2 ⁇ FeS + S.
- sulfuric acid production equipment for treating the sulfur oxide is not necessary as long as it does not cause a substantial adverse effect even if sulfur oxide is generated, and may be called a non-oxidizing atmosphere.
- the present invention it is allowed that oxygen in such a degree that it is inevitably mixed in the non-oxidizing atmosphere is present in the reaction system.
- oxygen in such a degree that it is inevitably mixed in the non-oxidizing atmosphere is present in the reaction system.
- the gold ore after undergoing the thermal decomposition has a marked improvement in solubility in the gold leachate described below. Compared to the case without thermal decomposition, the gold leaching rate can be increased by about 10 times.
- Non-oxidizing atmospheres when carrying out thermal decomposition include inert atmospheres such as ammonia, carbon monoxide, hydrogen sulfide, rare gas atmospheres such as argon and helium, nitrogen atmospheres and carbon dioxide atmospheres. Although an atmosphere is mentioned, an inert atmosphere is preferable from the viewpoint of preventing an unexpected reaction. Or you may circulate and use the exhaust gas used for thermal decomposition. If oxygen is contained in the atmosphere, the gold ore is oxidized and roasted to generate sulfur dioxide, which is not adopted in the present invention because there is a concern about the influence on the environment.
- the thermal decomposition is preferably carried out while maintaining the temperature of the gold ore at 550 ° C. or higher, more preferably at 650 ° C. or higher.
- the thermal decomposition is preferably continued for 5 minutes or more, and more preferably for 30 minutes or more. This is because the thermal decomposition reaction proceeds sufficiently.
- the holding temperature is preferably 800 ° C. or less, and more preferably 750 ° C. or less.
- the time for maintaining the holding temperature is also preferably 120 minutes or less, and more preferably 60 minutes or less.
- heating furnace for carrying out the thermal decomposition
- a tubular furnace or a rotary kiln can be used.
- the elemental sulfur generated by pyrolysis is gasified in a high-temperature furnace, it can be separated from the gold ore by solid-gas separation. Then, it can be sent to the exhaust system together with the atmospheric gas. However, when single sulfur is sent to the exhaust system, sulfur is deposited with a decrease in temperature to cause problems such as blockage of the gas passage. Therefore, it is desirable to recover with a wet scrubber or the like.
- the gasified elemental sulfur can be cooled together with the iron (II) sulfide generated in step 2 and recovered together in a solid state and sent together to the gold leaching step. In the gold leaching process, elemental sulfur is separated as a leaching residue without hindering gold leaching. In this case, a wet scrubber is unnecessary, which is economically advantageous.
- Gold leaching step In one embodiment of the gold leaching method according to the present invention, the gold ore after the pretreatment step is brought into contact with a gold leaching solution containing halide ions and iron ions under supply of an oxidizing agent, and the ore Step 3 of leaching the gold component therein is performed.
- Gold leaching proceeds when the eluted gold reacts with halide ions to form a gold halogen complex.
- the halide ion in the gold leaching solution may be chloride ion alone, but preferably contains bromide ion in addition to chloride ion.
- bromide ions By using bromide ions in combination, a complex is formed at a lower potential, so that the gold leaching efficiency can be improved.
- iron ion is a trivalent iron ion oxidized under the supply of an oxidant or a trivalent iron ion from the beginning to oxidize gold and to immediately oxidize hydrogen sulfide produced by reaction with acid to sulfur. do. Fe 2+ generated when iron sulfide is dissolved is also oxidized to Fe 3+ under the supply of an oxidizing agent.
- the gold leachate preferably contains copper ions. This is because copper ions are not directly involved in the reaction, but the presence of copper ions increases the oxidation rate of iron ions.
- the method for contacting the leachate with the gold ore is not particularly limited, and there are methods such as spreading and dipping. From the viewpoint of reaction efficiency, a method of dipping and stirring the residue in the leachate is preferred.
- the supply source of chloride ions is not particularly limited, and examples thereof include hydrogen chloride, hydrochloric acid, metal chloride, and chlorine gas. In consideration of economy and safety, supply in the form of metal chloride is preferable.
- the metal chloride include copper chloride (cuprous chloride, cupric chloride), iron chloride (ferrous chloride, ferric chloride), and alkali metals (lithium, sodium, potassium, rubidium, cesium, francium). Chlorides and chlorides of alkaline earth metals (beryllium, magnesium, calcium, strontium, barium, radium) can be mentioned, and sodium chloride is preferable from the viewpoint of economy and availability.
- it can utilize also as a supply source of copper ion and iron ion, it is also preferable to utilize copper chloride and iron chloride.
- the source of bromide ions is not particularly limited, but examples include hydrogen bromide, hydrobromic acid, metal bromide and bromine gas.
- the form of metal bromide is used. It is preferable to supply.
- the metal bromide include copper bromide (cuprous bromide, cupric bromide), iron bromide (ferrous bromide, ferric bromide), alkali metals (lithium, sodium, potassium, Examples thereof include bromides of rubidium, cesium, and francium) and bromides of alkaline earth metals (beryllium, magnesium, calcium, strontium, barium, and radium), and sodium bromide is preferable from the viewpoint of economy and availability.
- it can utilize also as a supply source of copper ion and iron ion, it is also preferable to utilize copper bromide and iron bromide.
- Copper ions and iron ions are usually supplied in the form of these salts.
- they can be supplied in the form of halide salts.
- copper ions are preferably supplied as copper chloride and / or copper bromide
- iron ions are preferably supplied as iron chloride and / or iron bromide.
- copper chloride and iron chloride it is preferable to use cupric chloride (CuCl 2 ) and ferric chloride (FeCl 3 ) from the viewpoint of oxidizing power, respectively, but cuprous chloride (CuCl) and ferric chloride are preferable.
- the concentration of chloride ions in the gold leachate used in step 3 is more preferably 30 g / L to 180 g / L.
- the bromide ion concentration in the gold leachate used in Step 3 is preferably 1 g / L to 100 g / L from the viewpoint of reaction rate and solubility, and from the viewpoint of economy, it is 10 g / L to 40 g / L. More preferably.
- the total concentration of chloride ions and bromide ions in the gold leaching solution is preferably 80 g / L to 200 g / L.
- the oxidation-reduction potential (vs Ag / AgCl) of the leaching solution at the start of Step 3 is preferably 550 mV or more, more preferably 600 mV or more from the viewpoint of promoting gold leaching.
- the pH of the gold leaching solution it is preferable to maintain the pH of the gold leaching solution at 2.0 or less. However, the higher the oxidation rate of iron, the higher the pH of the gold leaching solution. More preferably, it is maintained at 5 to 1.9.
- the temperature of the gold leachate is preferably 45 ° C. or higher from the viewpoint of increasing the gold leach rate, and more preferably 60 ° C. or higher. However, if it is too high, the leachate will evaporate and the heating cost will increase. It is preferable to set it as follows, and it is more preferable to set it as 85 degrees C or less.
- At least one of hydrochloric acid and bromic acid, and chloride chloride are selected on the condition that the gold leachate in step 3 is selected to contain both chloride ions and bromide ions.
- a mixed liquid containing at least one of dicopper and cupric bromide, at least one of ferric chloride and ferric bromide, and at least one of sodium chloride and sodium bromide can be used.
- the gold leaching step of step 3 is performed while supplying the oxidizing agent, thereby managing the redox potential. If an oxidizing agent is not added, the redox potential is lowered in the middle, and the leaching reaction does not proceed.
- an oxidizing agent For example, oxygen, air, chlorine, a bromine, hydrogen peroxide, etc. are mentioned. An oxidant with an extremely high redox potential is not necessary and air is sufficient. Air is also preferable from the viewpoint of economy and safety.
- elemental sulfur can separate gold and elemental sulfur by heating the gold ore after pretreatment to a temperature sufficient for elemental sulfur to melt and separating it.
- Iron sulfide (FeS) is made by contacting pre-treated gold ore with various mineral acids such as sulfuric acid and hydrochloric acid, as well as with aqueous solutions of Fe 3+ salts such as iron sulfate and iron chloride. It can be removed by liquid separation.
- gold can be recovered from a gold solution obtained by solid-liquid separation.
- money Activated carbon adsorption
- the S component exists in the form of sulfate, sulfide and elemental sulfur in the solution after leaching, but these can be separated from gold by solvent extraction.
- the metal analysis method used in the examples was ICP-AES.
- gold analysis gold in the sample was precipitated by the ash blowing method, and then quantitative analysis was performed by ICP-AES.
- ⁇ Comparative Example 1 Pyrite concentrate (Papua New Guinea domestic) was prepared. It was 17 mass% when content of the pyrite in this pyrite concentrate was calculated by XRD and chemical analysis. The pyrite concentrate was pulverized and ground with a ball mill, and the particle size (d80) at which the cumulative weight was 80% in the cumulative weight particle size distribution curve was adjusted to 24 ⁇ m. d80 is an average value when measured three times with a laser diffraction particle size distribution measuring apparatus (model SALD2100 manufactured by Shimadzu Corporation). Next, the pyrite concentrate (200 g) after milling was subjected to a leaching treatment for 90 hours at a liquid temperature of 85 ° C.
- FIG. 1 shows the relationship between the leaching time and the Au quality in the residue obtained from the results of the test (see the plot “FeS 2 no thermal decomposition” in FIG. 1). From this result, it can be seen that it takes 90 hours for the Au quality in the residue, which was initially about 6 g / t, to be reduced to 0.9 g / t.
- hydrochloric acid acidic gold leaching solution having the same composition as Comparative Example 1 to a pulp concentration of 100 g / L.
- air blowing 0.1 L / min with respect to 1 L of concentrate
- stirring were continued, and the oxidation-reduction potential (ORP: vs Ag / AgCl) was maintained at 400 mV or higher.
- ORP oxidation-reduction potential
- hydrochloric acid was appropriately added so that the pH of the gold leaching solution was maintained at 1.0 to 1.1.
- FIG. 1 shows the relationship between the leaching time and the Au quality in the residue obtained from the results of the test (see the “FeS 2 thermal decomposition” plot in FIG. 1). From this result, it can be seen that the Au quality in the residue, which was about 6 g / t at the beginning, decreased to 0.6 g / t in just 12 hours.
- Table 4 shows the leaching time and leaching rate of gold in Example 2 and Comparative Example 2.
- Example 3 Temperature at which thermal decomposition occurs>
- the pyrite concentrate after milling used in Example 1 was subjected to thermal analysis under a nitrogen atmosphere (model TG / DTA6300 manufactured by Seiko Co., Ltd.), and the change in weight and endotherm-exotherm at each temperature were investigated.
- the heating rate was 20 ° C. per minute.
- the results are shown in FIG.
- the decrease in mass begins at 450 ° C, and at the same time heat generation is seen, indicating that the decomposition of pyrite has started.
- a nitrogen atmosphere pyrolysis of pyrite will not occur unless the temperature is raised to at least 450 ° C.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
前処理工程後の金鉱石を、ハロゲン化物イオン及び鉄イオンを含有する金浸出液に酸化剤の供給下で接触させて、当該鉱石中の金成分を浸出する工程3と、
を含む金の浸出方法である。
本発明に係る金鉱石の前処理方法の一実施形態においては、黄鉄鉱を含有する金鉱石を準備する工程1と、当該金鉱石を非酸化性雰囲気下で450℃以上に加熱し、当該金鉱石中の黄鉄鉱を硫化鉄(II)及び単体硫黄に熱分解する工程2とを含み、酸化焙焼工程を含まない。
工程1では黄鉄鉱を含有する金鉱石を準備する。というのは、本発明では難溶性で金浸出率の低い黄鉄鉱中の金の浸出率を高めることを目的とするからである。しかしながら、それ以外の要件、例えば、鉱石中の金の濃度の大小は問わない。本発明の処理対象となる金鉱石は、浮遊選鉱や比重選別といった慣用の選鉱処理を経たものとすることもできる。粉砕摩鉱して鉱石の粒径を小さくし、金浸出液が鉱石内部の金に接触しやすいようにすることもできる。金鉱石中の金濃度は典型的には0.1~100質量ppm程度であり、より典型的には1~20質量ppm程度である。
工程2では当該金鉱石を非酸化性雰囲気下で450℃以上に加熱し、当該金鉱石中の黄鉄鉱を硫化鉄(II)及び単体硫黄に熱分解する。このときの化学反応は次式:FeS2→FeS+Sで表される。理論的には酸化硫黄の発生はないが、完全に酸素を遮断することは現実的には困難なケースもある。また、実操業においては、酸化硫黄が発生しても実質的な悪影響を与えない程度であれば、これを処理するための硫酸製造設備も不要であり、非酸化性雰囲気と呼んで差し支えない。そこで、本発明においては非酸化性雰囲気の中には不可避的に混入する程度の酸素が反応系に存在することは許容されている。例えば、黄鉄鉱に対する酸素供給量のモル比が酸素:黄鉄鉱=1:5以下であれば許容され、1:10以下であればより好ましい。当該熱分解を経た後の金鉱石は、後述する金浸出液に対する溶解性が格段に向上する。熱分解を経ない場合に比べて、金の浸出率が約10倍も上昇し得る。本発明で行う熱分解法では黄鉄鉱(FeS2)がヘマタイト(Fe2O3)へ変化しないため、金の浸出率が不十分であると思われたことから、このような結果が得られたことは極めて驚くべき事であった。
本発明に係る金浸出方法の一実施形態においては、前処理工程後の金鉱石を、ハロゲン化物イオン及び鉄イオンを含有する金浸出液に酸化剤の供給下で接触させて、当該鉱石中の金成分を浸出する工程3を実施する。
黄鉄鉱精鉱(パプアニューギニア国産)を準備した。この黄鉄鉱精鉱中の黄鉄鉱の含有量をXRDと化学分析により算定したところ、17質量%であった。黄鉄鉱精鉱をボールミルで粉砕摩鉱して、累積重量粒度の分布曲線において累積重量が80%となる粒径(d80)を24μmに調整した。d80は、レーザ回折式粒度分布測定装置(島津製作所社型式SALD2100)で3回測定したときの平均値とした。次いで、摩鉱後の黄鉄鉱精鉱(200g)に対して、表1に記載の組成を有する塩酸酸性の金浸出液を用いてパルプ濃度100g/Lとし、液温85℃で90時間浸出処理を行った。浸出処理中は空気の吹き込み(精鉱1Lに対して0.1L/min)及び撹拌を継続し、酸化還元電位(ORP:vs Ag/AgCl)を530mV以上に維持した。また、浸出中は、金浸出液のpHが1.0~1.1を維持するように塩酸を適宜添加した。
比較例1と同じ摩鉱後の黄鉄鉱精鉱(1.5kg)を管状炉に装入し、窒素雰囲気下で1時間かけて700℃まで昇温(昇温速度=10℃/min)した後、1時間加熱した。室温まで放冷後、加熱処理前後のXRD解析により、元鉱中に含まれていたFeS2のピークが消失し、FeSのピークが生じたことを確認した。熱処理により生じた単体硫黄は特に除去操作を施さなかった。
次いで、熱処理後の黄鉄鉱精鉱に対して、比較例1と同じ組成を有する塩酸酸性の金浸出液を用いてパルプ濃度100g/Lとし、液温85℃で18時間浸出処理を行った。浸出処理中は空気の吹き込み(精鉱1Lに対して0.1L/min)及び撹拌を継続し、酸化還元電位(ORP:vs Ag/AgCl)を400mV以上に維持した。また、浸出中は、金浸出液のpHが1.0~1.1を維持するように塩酸を適宜添加した。
実施例1で使用した摩鉱後の黄鉄鉱精鉱(1.5kg)に対して、表1に記載のように保持温度及び保持時間を変化させたときのXRD解析におけるFeS2及びFeSの回折強度変化を調査した。実験は管状炉を使用し、窒素雰囲気下で行った。熱分解により生成する単体硫黄は蒸発させて窒素気流により除いた。昇温速度はすべて10℃/minとした。冷却は室温になるまで放冷した。XRD解析はリガク社製型式RINT2200 ultimateを使用した。FeS2は2θ=32.98°と56.15°、FeSは2θ=43.67°と33.78°に特徴的なピークをもつのでこれらの入射角に着目した。結果を表2に示す。
比較例1と同じ摩鉱後の黄鉄鉱精鉱(1.5kg)を管状炉に装入し、窒素雰囲気下で1時間かけて700℃まで昇温(昇温速度=10℃/min)した後、1時間加熱した。室温まで放冷後、熱処理後の黄鉄鉱精鉱に対して、表3に記載の組成を有する塩酸酸性の金浸出液を用いてパルプ濃度100g/Lとし、液温85℃で浸出処理を行った。浸出処理中は空気の吹き込み(精鉱1Lに対して0.1L/min)及び撹拌を継続し、酸化還元電位(ORP:vs Ag/AgCl)を600mV以上に維持した。ただしNaBrに関してはNaBrを添加せず、他の成分は同じ条件でも浸出を行った。一定の時間ごとにサンプリングを行い液中の金の濃度を定量した。また、浸出中は、金浸出液のpHが1.0~1.1を維持するように塩酸を適宜添加した。
比較例1と同じ摩鉱後の黄鉄鉱精鉱(1.5kg)を実施例3と同じ組成を有する塩酸酸性の金浸出液を用いてパルプ濃度100g/Lとし、液温85℃で浸出処理を行った。浸出処理中は空気の吹き込み(精鉱1Lに対して0.1L/min)及び撹拌を継続し、酸化還元電位(ORP:vs Ag/AgCl)を600mV以上に維持した。ただしNaBrに関しては実施例2と同じくNaBrを添加せず、他の成分は同じ条件でも浸出を行った。一定の時間ごとにサンプリングを行い液中の金の濃度を定量した。また、浸出中は、金浸出液のpHが1.0~1.1を維持するように塩酸を適宜添加した。
実施例1で使用した摩鉱後の黄鉄鉱精鉱に対し、窒素雰囲気下での熱分析(セイコー社製型式TG/DTA6300)により、各温度における重量変化と吸熱-発熱を調査した。昇温速度は毎分20℃とした。結果を図2に示す。450℃で質量の減少が始まり、同時に発熱が見られることから黄鉄鉱の分解が始まっていることが判る。窒素雰囲気下では最低でも450℃まで昇温しなければ黄鉄鉱の熱分解は生じない。ただし、上述したXRD解析の結果からみると、450℃付近では熱分解に長時間を要すると考えられ、600℃以上での加熱処理が望ましい。
Claims (8)
- 黄鉄鉱を含有する金鉱石を準備する工程1、及び、当該金鉱石を非酸化性雰囲気下で450℃以上に加熱し、当該金鉱石中の黄鉄鉱を硫化鉄(II)及び単体硫黄に熱分解する工程2を含み、酸化焙焼工程を含まない前処理と、
前処理工程後の金鉱石を、ハロゲン化物イオン及び鉄イオンを含有する金浸出液に酸化剤の供給下で接触させて、当該鉱石中の金成分を浸出する工程3と、
を含む金の浸出方法。 - 金浸出液が塩化物イオン及び臭化物イオンを含有する請求項1に記載の金の浸出方法。
- 工程3における金の浸出は酸化還元電位(参照電極は銀/塩化銀)を550mV以上に保持する条件下で行われる請求項1又は2に記載の金の浸出方法。
- 工程2における熱分解は前記金鉱石を600~750℃で5~60分保持する条件下で行われる請求項1又は2に記載の金の浸出方法。
- 金鉱石中の黄鉄鉱の含有量が5~80質量%である請求項1~3の何れか一項に記載の金の浸出方法。
- 工程2で発生する気体状の単体硫黄は金鉱石から固気分離により除去される請求項1~4の何れか一項に記載の金の浸出方法。
- 工程2で発生する硫化鉄(II)及び単体硫黄は冷却して共に固体状で回収し、一緒に金浸出液に接触させることで金の浸出工程を実施する請求項1~4の何れか一項に記載の金の浸出方法。
- 金浸出液のpHを1.9以下に保持して金の浸出工程を実施する請求項1~6の何れか一項に記載の金の浸出方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2013204508A AU2013204508B2 (en) | 2012-09-04 | 2013-04-10 | Method for leaching gold from gold ore containing pyrite |
JP2014534212A JP5955393B2 (ja) | 2012-09-04 | 2013-04-10 | 黄鉄鉱を含有する金鉱石からの金の浸出方法 |
CA2880943A CA2880943C (en) | 2012-09-04 | 2013-04-10 | Method for leaching gold from gold ore containing pyrite |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012194436 | 2012-09-04 | ||
JP2012-194436 | 2012-09-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014038236A1 true WO2014038236A1 (ja) | 2014-03-13 |
Family
ID=50236861
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/060797 WO2014038236A1 (ja) | 2012-09-04 | 2013-04-10 | 黄鉄鉱を含有する金鉱石からの金の浸出方法 |
Country Status (6)
Country | Link |
---|---|
JP (1) | JP5955393B2 (ja) |
AU (1) | AU2013204508B2 (ja) |
CA (1) | CA2880943C (ja) |
CL (1) | CL2015000452A1 (ja) |
PE (1) | PE20150448A1 (ja) |
WO (1) | WO2014038236A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015187286A (ja) * | 2014-03-26 | 2015-10-29 | Jx日鉱日石金属株式会社 | 金鉱石の前処理方法 |
JP2015196847A (ja) * | 2014-03-31 | 2015-11-09 | Jx日鉱日石金属株式会社 | 鉄の除去方法及び鉄の浸出方法、並びに金の回収方法 |
JP2017179430A (ja) * | 2016-03-29 | 2017-10-05 | Jx金属株式会社 | 金鉱石の前処理方法及び、金鉱石からの金の回収方法 |
WO2019028497A1 (en) | 2017-08-08 | 2019-02-14 | Cobalt Blue Holdings Ltd | RECOVERING METALS FROM PYRITE |
WO2019064709A1 (ja) * | 2017-09-26 | 2019-04-04 | Jx金属株式会社 | 金の浸出方法および、金の回収方法 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6849482B2 (ja) | 2016-03-31 | 2021-03-24 | Jx金属株式会社 | 金を含む鉱石もしくは精錬中間物からの金の回収方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07508073A (ja) * | 1992-06-26 | 1995-09-07 | インテック プロプライエタリー リミテッド | 鉱物からの金属の製造方法 |
JP2009526912A (ja) * | 2006-02-17 | 2009-07-23 | オウトテック オサケイティオ ユルキネン | 金回収方法 |
JP2009235525A (ja) * | 2008-03-27 | 2009-10-15 | Nippon Mining & Metals Co Ltd | 金の浸出方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4085908B2 (ja) * | 2003-07-28 | 2008-05-14 | 住友金属鉱山株式会社 | 湿式銅精錬プロセスの浸出残渣に含有される貴金属の濃縮方法 |
JP4642796B2 (ja) * | 2006-09-28 | 2011-03-02 | Jx日鉱日石金属株式会社 | 金の浸出方法 |
-
2013
- 2013-04-10 JP JP2014534212A patent/JP5955393B2/ja active Active
- 2013-04-10 CA CA2880943A patent/CA2880943C/en active Active
- 2013-04-10 AU AU2013204508A patent/AU2013204508B2/en active Active
- 2013-04-10 WO PCT/JP2013/060797 patent/WO2014038236A1/ja active Application Filing
- 2013-04-10 PE PE2015000281A patent/PE20150448A1/es active IP Right Grant
-
2015
- 2015-02-25 CL CL2015000452A patent/CL2015000452A1/es unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07508073A (ja) * | 1992-06-26 | 1995-09-07 | インテック プロプライエタリー リミテッド | 鉱物からの金属の製造方法 |
JP2009526912A (ja) * | 2006-02-17 | 2009-07-23 | オウトテック オサケイティオ ユルキネン | 金回収方法 |
JP2009235525A (ja) * | 2008-03-27 | 2009-10-15 | Nippon Mining & Metals Co Ltd | 金の浸出方法 |
Non-Patent Citations (1)
Title |
---|
DUNN, J. G. ET AL.: "PYROLYSIS OF ARSENOPYRITE FOR GOLD RECOVERY BY CYANIDATION", MINERALS ENGINEERING, vol. 8, no. 4/5, 1995, pages 459 - 471 * |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015187286A (ja) * | 2014-03-26 | 2015-10-29 | Jx日鉱日石金属株式会社 | 金鉱石の前処理方法 |
JP2015196847A (ja) * | 2014-03-31 | 2015-11-09 | Jx日鉱日石金属株式会社 | 鉄の除去方法及び鉄の浸出方法、並びに金の回収方法 |
JP2017179430A (ja) * | 2016-03-29 | 2017-10-05 | Jx金属株式会社 | 金鉱石の前処理方法及び、金鉱石からの金の回収方法 |
WO2019028497A1 (en) | 2017-08-08 | 2019-02-14 | Cobalt Blue Holdings Ltd | RECOVERING METALS FROM PYRITE |
JP2020530530A (ja) * | 2017-08-08 | 2020-10-22 | コバルト ブルー ホールディングズ リミテッドCobalt Blue Holdings Ltd | 黄鉄鉱からの金属の回収 |
JP7050925B2 (ja) | 2017-08-08 | 2022-04-08 | コバルト ブルー ホールディングズ リミテッド | 黄鉄鉱からの金属の回収 |
WO2019064709A1 (ja) * | 2017-09-26 | 2019-04-04 | Jx金属株式会社 | 金の浸出方法および、金の回収方法 |
JP2019059984A (ja) * | 2017-09-26 | 2019-04-18 | Jx金属株式会社 | 金の浸出方法および、金の回収方法 |
AU2018340945B2 (en) * | 2017-09-26 | 2021-05-27 | Jx Nippon Mining & Metals Corporation | Gold leaching method and gold recovery method |
Also Published As
Publication number | Publication date |
---|---|
CA2880943C (en) | 2017-01-17 |
JP5955393B2 (ja) | 2016-07-20 |
JPWO2014038236A1 (ja) | 2016-08-08 |
AU2013204508B2 (en) | 2015-07-16 |
CL2015000452A1 (es) | 2015-06-12 |
PE20150448A1 (es) | 2015-04-15 |
AU2013204508A1 (en) | 2014-03-20 |
CA2880943A1 (en) | 2014-03-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5840641B2 (ja) | 黄鉄鉱を含有する金鉱石からの金の回収方法 | |
JP5955393B2 (ja) | 黄鉄鉱を含有する金鉱石からの金の浸出方法 | |
JP5832665B2 (ja) | 黄鉄鉱を含有する金鉱石からの金の浸出方法 | |
WO2014168222A1 (ja) | 前処理後の金鉱石 | |
JP6195536B2 (ja) | 鉄の除去方法及び鉄の浸出方法、並びに金の回収方法 | |
AU2013100641A4 (en) | Pretreated gold ore | |
JP6329939B2 (ja) | 金鉱石の前処理方法 | |
AU2015234654B2 (en) | Method for pre-treating gold ore | |
WO2014155752A1 (ja) | 金鉱石の前処理方法 | |
AU2013100677A4 (en) | Method of pretreating gold ore | |
WO2019064709A1 (ja) | 金の浸出方法および、金の回収方法 | |
AU2013100642A4 (en) | Method of pretreating gold ore | |
JP6038192B2 (ja) | 黄鉄鉱を含有する金鉱石からの金の浸出方法 | |
AU2015234654A1 (en) | Method for pre-treating gold ore |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 2013204508 Country of ref document: AU |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13835898 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2880943 Country of ref document: CA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2015000452 Country of ref document: CL |
|
WWE | Wipo information: entry into national phase |
Ref document number: 000281-2015 Country of ref document: PE |
|
ENP | Entry into the national phase |
Ref document number: 2014534212 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 13835898 Country of ref document: EP Kind code of ref document: A1 |