WO2011114303A1 - Improvement of concentrate quality in enrichment of ug-2 platinum ore - Google Patents
Improvement of concentrate quality in enrichment of ug-2 platinum ore Download PDFInfo
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- WO2011114303A1 WO2011114303A1 PCT/IB2011/051117 IB2011051117W WO2011114303A1 WO 2011114303 A1 WO2011114303 A1 WO 2011114303A1 IB 2011051117 W IB2011051117 W IB 2011051117W WO 2011114303 A1 WO2011114303 A1 WO 2011114303A1
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- 229910052697 platinum Inorganic materials 0.000 title claims description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 title description 13
- 239000012141 concentrate Substances 0.000 title description 5
- 239000000126 substance Substances 0.000 claims abstract description 107
- 239000000203 mixture Substances 0.000 claims abstract description 77
- 238000000034 method Methods 0.000 claims abstract description 66
- 150000001875 compounds Chemical class 0.000 claims abstract description 33
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 25
- 239000006185 dispersion Substances 0.000 claims abstract description 25
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims abstract description 25
- 239000004094 surface-active agent Substances 0.000 claims abstract description 24
- 239000000654 additive Substances 0.000 claims abstract description 23
- 229920000642 polymer Polymers 0.000 claims abstract description 19
- 230000000996 additive effect Effects 0.000 claims abstract description 14
- 238000000926 separation method Methods 0.000 claims abstract description 14
- -1 alkaline earth metal cations Chemical class 0.000 claims description 23
- 125000003368 amide group Chemical group 0.000 claims description 23
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 23
- 125000004043 oxo group Chemical group O=* 0.000 claims description 23
- 150000001768 cations Chemical class 0.000 claims description 22
- 229910052739 hydrogen Inorganic materials 0.000 claims description 22
- 239000001257 hydrogen Substances 0.000 claims description 22
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 16
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 16
- 229910052783 alkali metal Inorganic materials 0.000 claims description 14
- 150000001340 alkali metals Chemical class 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 9
- 229910052763 palladium Inorganic materials 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 230000002209 hydrophobic effect Effects 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 150000002431 hydrogen Chemical class 0.000 claims description 5
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 125000000129 anionic group Chemical group 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims 1
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical group FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 claims 1
- 238000005188 flotation Methods 0.000 abstract description 18
- 125000002947 alkylene group Chemical group 0.000 abstract description 3
- 150000001541 aziridines Chemical class 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- 229910052500 inorganic mineral Inorganic materials 0.000 description 9
- 150000002739 metals Chemical class 0.000 description 9
- 239000011707 mineral Substances 0.000 description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 9
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 9
- 239000011734 sodium Substances 0.000 description 9
- 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 8
- 229910052708 sodium Inorganic materials 0.000 description 8
- 239000011777 magnesium Substances 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 4
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- 239000011591 potassium Substances 0.000 description 4
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 4
- 229910052611 pyroxene Inorganic materials 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910052960 marcasite Inorganic materials 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 229910052683 pyrite Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-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
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- 229910052948 bornite Inorganic materials 0.000 description 2
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- DVRDHUBQLOKMHZ-UHFFFAOYSA-N chalcopyrite Chemical compound [S-2].[S-2].[Fe+2].[Cu+2] DVRDHUBQLOKMHZ-UHFFFAOYSA-N 0.000 description 2
- 229910052951 chalcopyrite Inorganic materials 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 229910052909 inorganic silicate Inorganic materials 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000006068 polycondensation reaction Methods 0.000 description 2
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 238000007151 ring opening polymerisation reaction Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 125000006755 (C2-C20) alkyl group Chemical group 0.000 description 1
- RBACIKXCRWGCBB-UHFFFAOYSA-N 1,2-Epoxybutane Chemical compound CCC1CO1 RBACIKXCRWGCBB-UHFFFAOYSA-N 0.000 description 1
- 125000004066 1-hydroxyethyl group Chemical group [H]OC([H])([*])C([H])([H])[H] 0.000 description 1
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 1
- CONMNFZLRNYHIQ-UHFFFAOYSA-N 3-methylbutoxymethanedithioic acid Chemical compound CC(C)CCOC(S)=S CONMNFZLRNYHIQ-UHFFFAOYSA-N 0.000 description 1
- NOWKCMXCCJGMRR-UHFFFAOYSA-N Aziridine Chemical compound C1CN1 NOWKCMXCCJGMRR-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 244000007835 Cyamopsis tetragonoloba Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- UOJYYXATTMQQNA-UHFFFAOYSA-N Proxan Chemical compound CC(C)OC(S)=S UOJYYXATTMQQNA-UHFFFAOYSA-N 0.000 description 1
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 1
- 229910052656 albite Inorganic materials 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- DKVNPHBNOWQYFE-UHFFFAOYSA-N carbamodithioic acid Chemical compound NC(S)=S DKVNPHBNOWQYFE-UHFFFAOYSA-N 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- YGANSGVIUGARFR-UHFFFAOYSA-N dipotassium dioxosilane oxo(oxoalumanyloxy)alumane oxygen(2-) Chemical compound [O--].[K+].[K+].O=[Si]=O.O=[Al]O[Al]=O YGANSGVIUGARFR-UHFFFAOYSA-N 0.000 description 1
- 239000012990 dithiocarbamate Substances 0.000 description 1
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000010685 fatty oil Substances 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 239000004872 foam stabilizing agent Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 1
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 229910000015 iron(II) carbonate Inorganic materials 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910021519 iron(III) oxide-hydroxide Inorganic materials 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 229910052627 muscovite Inorganic materials 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 229910052592 oxide mineral Inorganic materials 0.000 description 1
- 229910052954 pentlandite Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- OMKVZYFAGQKILB-UHFFFAOYSA-M potassium;butoxymethanedithioate Chemical compound [K+].CCCCOC([S-])=S OMKVZYFAGQKILB-UHFFFAOYSA-M 0.000 description 1
- YEEBCCODSASHMM-UHFFFAOYSA-M potassium;octoxymethanedithioate Chemical compound [K+].CCCCCCCCOC([S-])=S YEEBCCODSASHMM-UHFFFAOYSA-M 0.000 description 1
- YIBBMDDEXKBIAM-UHFFFAOYSA-M potassium;pentoxymethanedithioate Chemical group [K+].CCCCCOC([S-])=S YIBBMDDEXKBIAM-UHFFFAOYSA-M 0.000 description 1
- NZUFLKMNMAHESJ-UHFFFAOYSA-M potassium;propoxymethanedithioate Chemical compound [K+].CCCOC([S-])=S NZUFLKMNMAHESJ-UHFFFAOYSA-M 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- HIZCIEIDIFGZSS-UHFFFAOYSA-L trithiocarbonate Chemical compound [S-]C([S-])=S HIZCIEIDIFGZSS-UHFFFAOYSA-L 0.000 description 1
- 239000012989 trithiocarbonate Substances 0.000 description 1
- 238000001238 wet grinding Methods 0.000 description 1
- 239000012991 xanthate Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/01—Organic compounds containing nitrogen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/016—Macromolecular compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/02—Collectors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; Specified applications
- B03D2203/02—Ores
- B03D2203/025—Precious metal ores
Definitions
- the present invention relates to a process for separating at least one first substance from a mixture comprising this at least one first substance and at least one second substance, comprising the steps (A) bringing the mixture comprising at least one first substance and at least one second substance into contact with at least one surface- active substance, if required in the presence of at least one dispersing medium, the surface-active substance binding to the at least one first substance and making the latter hydrophobic or even further increasing the contact angle in the air/water system, (B) if required, addition of at least one dispersing medium to the mixture obtained in step (A) in order to obtain a dispersion, and (C) separation of the adduct of at least one first substance and at least one surface-active substance from the dispersion from step (A) or (B), for example by means of flotation, at least one additive which is either a monomolecular compound comprising amino and carboxyl groups or derivatives thereof or a polymeric compound obtainable by reaction of alkylene oxides and/or aziridines, or mixtures
- the present invention relates to a process for enriching metal-containing minerals in the presence of the matrix.
- Processes for separating valuable ores from mixtures comprising them are already known from the prior art.
- Flotation is the standard method for ore enrichment and in other areas, for example in papermaking, and has been known for about 1 10 years.
- sulfidic minerals are milled to a small size and treated with an oil so that they float on the surface of the flotation bath.
- the desired sulfidic ores can be transported to the surface by using air bubbles.
- the ores to be handled are treated with naturally occurring flotation reagents, such as fatty acids and oils, or synthetically prepared reagents, such as surface-active compounds, in order to increase the hydrophobicity of the valuable ores and hence to facilitate the transport to the surface of the flotation bath. It is an object of the present invention to provide a process by means of which at least one first substance can be efficiently separated from mixtures comprising at least one first substance and at least one second substance.
- a further object of the present invention is to provide a process which makes it possible to separate off the at least one first substance efficiently and in high yield although further substances which hinder this separation are present in the mixture to be treated.
- a further object of the present invention is to separate the desired component from a mixture of substances with an improved concentrate quality in order to be able to carry out subsequent working-up steps more efficiently.
- a process for separating at least one first substance from a mixture comprising this at least one first substance and at least one second substance comprising the following steps: bringing the mixture comprising at least one first substance and at least one second substance into contact with at least one surface-active substance, if required in the presence of at least one dispersing medium, the surface-active substance binding to the at least one first substance and making the latter hydrophobic or increasing the existing hydrophobicity,
- step (B) if required, addition of at least one dispersing medium to the mixture obtained in step (A) in order to obtain a dispersion
- m, n, R 1 , R 2 and R 3 have the following meanings: independently of one another, are an integer from 1 to 6, R 1 , R 2 independently of one another, are H or a negative charge with, independently of one another, associated cations H + , alkali metal or alkaline earth metal cations or NR 4 + where R, independently of one another, is H or CrC 8 -alkyl, independently of one another, is a structural unit selected from units of the general formula (II), (III) and/or (IV)
- P, q, r independently of one another, are an integer from 0 to 3, is an integer from 1 to 50,
- the at least one first substance is selected from the group consisting of Pt, Pd, Au, Rh and mixtures thereof, preferably in each case as a solid solution in sulfidic minerals, such as, for example, chalcopyrite CuFeS 2 , bornite Cu 5 FeS 4 , pentlandite Ni x Fei -x S (0.3 ⁇ x ⁇ 0.7), pyrite FeS 2 , marcasite FeS 2 or pyrrotin Fei -x S (0 ⁇ x ⁇ 0.2) and related minerals, as a compound with other elements, as an alloy with one another or with other metals and/or in native form.
- sulfidic minerals such as, for example, chalcopyrite CuFeS 2 , bornite Cu 5 FeS 4 , pentlandite Ni x Fei -x S (0.3 ⁇ x ⁇ 0.7), pyrite FeS 2 , marcasite FeS 2 or pyrrotin Fei -x S (0 ⁇ x ⁇ 0.2) and related minerals, as a compound with other
- Alloys which may be mentioned by way of example are alloys of said metals in elemental form with one another and/or with metals selected from the group consisting of the coinage metals or the iron group (Fe, Co, Ni) and mixtures thereof.
- the at least one first substance is present in the mixture to be treated in more than one of said forms.
- compounds of said metals are present alongside alloys of said metals and alongside said metals in native form.
- said first substances are present in association with small amounts of sulfidic copper and/or nickel minerals, for example in amounts of from 0.01 to 0.02% by weight.
- the at least one second substance which is present in the mixture to be treated is a compound, an oxide or silicate mineral or a mixture of a plurality of such which occur, for example, in naturally occurring ores, which comprise the first substances preferred according to the invention, in association with said first substances, or forms a significant part of the rock matrix.
- the at least one second substance is chromite.
- Chromite is known per se to the person skilled in the art and has the formula (Mg, Fe")Cr 2 0 4 , it being possible for the mineral to be substituted by further metals in small amounts too, for example Ca instead of Mg; Fe'", Ni, Co and/or Ti instead of Cr.
- this preferably used ore comprises chromite in an amount of, for example, from 60 to 75% by weight.
- at least one third substance may optionally be present in addition to the at least one first substance and the at least one second substance.
- Pyroxenes have the general formula M 1 M 2 T 2 0 6 , in which M 1 , M 2 and T represent different positions in the pyroxene structure and may have the following meanings:
- M 1 Mg 2+ , Fe 2+ , Mn 2+ , Ca 2+ , Na + , Li + , preferably Mg 2+ , Fe 2+ , Mn 2+ , Ca 2+ ,
- T Si 4+ , Al 3+ , Fe 3+ , preferably Si 4+ .
- Olivines have the general formula (Mg,Fe) 2 [Si0 4 ], in which optionally a small proportion of magnesium and/or iron can be substituted by nickel.
- the mixture comprising at least one first substance and at least one second substance is present in step (A) in the form of particles having a size of from 100 nm to 100 ⁇ , cf. for example US 5,051 , 199. In a preferred embodiment, this particle size is obtained by milling. Suitable processes and apparatuses are known to a person skilled in the art, for example wet milling in a horizontal or vertical ball mill, rod mill, stirred ball mill or variations thereof, if required supported by vibration.
- the mixture comprising at least one first substance and at least one second substance is milled before or during step (A) to give particles having a size of from 100 nm to 100 ⁇ .
- Step (A) of the process according to the invention comprises bringing the mixture comprising at least one first substance and at least one second substance into contact with at least one surface-active substance, if required in the presence of at least one dispersing medium, the surface-active substance selectively binding to the at least one first substance and making the latter hydrophobic or increasing the existing hydrophobicity.
- A-Z (XI) which binds to the at least one first substance, in which A is selected from straight-chain or branched C 2 -C 3 o-alkyl, C 3 -C 3 o-heteroalkyl, optionally substituted C 6 -C 3 o-aryl, optionally substituted C 6 -C 30 -heteroalkyl, C 6 -C 30 -aralkyl and
- Z is a group with which the compound of the general formula (XI) binds to the at least one hydrophobic substance, is preferably used.
- A is a straight-chain or branched C 4 -C 2 o-alkyl, particularly preferably C 6 -Ci 2 -alkyl, very particularly preferably a straight-chain C 4 - or C 8 -alkyl.
- Heteroatoms optionally present according to the invention are selected from N, O, P, S and halogens, such as F, CI, Br and I.
- A is a straight-chain or branched C 2 -C 5 -alkyl.
- A is preferably a branched C 6 -Ci 4 -alkyl, the at least one substituent, preferably having 1 to 6 carbon atoms, preferably being present in the 2-position, for example 2-ethylhexyl and/or 2-propylheptyl.
- Z is selected from the group consisting of anionic groups -(X) n -P0 3 2" , -(X) n -P0 2 S 2 -, -(X) n -POS 2 2" , -(X) n -PS 3 2" , -(X) n -PS 2 -, -(X)n-POS-, -( ⁇ ) ⁇ - ⁇ 0 2 -, -(X) n -P0 3 2 - -(X) n -C0 2 -, -(X) n -CS 2 -, -(X)n-COS-, -(X) n -C(S)NHOH, -(X)n-S " where X is selected from the group consisting of O, S, NH, CH 2 and n is 0, 1 or 2, optionally with cations selected from the group consisting of hydrogen, alkali metals or alkaline earth metals
- n is 2, two identical or different, preferably identical, groups A are present bonded to a group Z.
- cations selected from the group consisting of hydrogen, alkali metals or alkaline earth metals, in particular sodium or potassium, NR 4 + where R, independently of one another, is hydrogen and/or CrC 8 - alkyl, are present as counterions in these compounds.
- step (A) of the process according to the invention can be effected by all methods known to a person skilled in the art.
- Step (A) can be carried out in the absence of a dispersing medium or in dispersion, preferably in suspension, particularly preferably in aqueous suspension.
- step (A) is carried out in the absence of a dispersing medium.
- the mixture to be treated after prior comminution in a mill, and the at least one surface-active substance and dispersing medium are combined in the corresponding amounts and mixed.
- Suitable mixing apparatuses are known to a person skilled in the art, for example stirred containers.
- the addition of the surface-active substance and of the additive can be effected during the comminution itself or only thereafter.
- step (A) or in the following steps of the process according to the invention optionally further assistants can be added.
- Corresponding assistants are known per se to the person skilled in the art. The following may be mentioned by way of example: so-called foaming agents which serve for stabilizing the air bubbles in a flotation process optionally carried out;
- regulators such as pH regulators (e.g. Ca(OH) 2 or H 2 S0 4 ), depressants, such as, for example, carboxymethylcellulose or guar,
- step (B) is not carried out.
- step (B) it is possible in this embodiment too to carry out step (B), i.e. to add further dispersing medium, in order to obtain a dispersion having a lower concentration.
- step (B) therefore, either the mixture present as such from step (A) is converted into a dispersion or the mixture already present in dispersion from step (A) is converted into a dispersion of lower concentration by addition of dispersing medium.
- the amount of dispersing medium added in step (A) and/or step (B) can be chosen, according to the invention, so that a dispersion which is readily stirrable and/or transportable is obtained.
- the amount of mixture to be treated, based on the total slurry or dispersion is up to 70% by weight, particularly preferably from 5 to 40% by weight.
- Fine milling is necessary for this process in order sufficiently to break up the ore present and to enable the finely distributed air bubbles to transport small mineral particles to the surface of the dispersion and to keep them in the foam blanket.
- n independently of one another, are an integer from 1 to 6,
- o, p, q, r, s, t, u, v, R 4 , R 5 , R 6 , R 7 , R 8 and R 9 have the following meanings: o, s,
- x, y, z, R 10 and R 11 have the following meanings: x, y, z independently of one another, are an integer from 2 to 500, R 10 independently of one another, is CrC 6 -alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups, and/or a straight-chain or branched polymeric group comprising units of the general formula (VIII), (IX) and/or (X)
- a, b, c, R 12 and R 13 have the following meanings: independently of one another, are an integer from 1 to 50,
- R 12 independently of one another, is CrC 6 -alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups
- R 13 independently of one another, is hydrogen or CrC 6 -alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups
- alkaline earth metal cations which are suitable according to the invention are Be 2+ , Mg 2+ , Ca 2+ , Sr 2 " and Ba 2+ .
- R 3 is a structural unit of the general formula (II)
- R 3 is a structural unit of the general formula (III)
- p, q and r independently of one another, are an integer from 0 to 3, i.e. 0, 1 , 2 or 3, preferably in each case 1 , and R 5 and R 6 , independently of one another, are in general H or a negative charge with, independently of one another, associated cations H + , alkali metal or alkaline earth metal cations or NR 4 + where R, independently of one another, is H or CrC 8 -alkyl.
- R 5 and R 6 are each hydrogen.
- ethylenediaminetetraacetic acid (EDTA) of the formula (lb) or its salts are therefore used as an additive in the process according to the invention.
- R 3 is a structural unit of the general formula (IV)
- s, u and v independently of one another, are an integer from 1 to 6, i.e. 1 , 2, 3, 4, 5 or 6, preferably in each case 1
- t is an integer from 1 to 50, preferably from 1 to 5.
- R 7 , R 8 and R 9 independently of one another, are in general H or a negative charge with the abovementioned associated cations.
- R 7 , R 8 and R 9 are each hydrogen.
- t is an integer from 1 to 50, is therefore used as an additive in the process according to the invention.
- straight-chain or branched polymeric compounds comprising units of the general formula (V), (VI) and/or (VII)
- the polymers used are composed of one or more of said building blocks (V), (VI) and/or (VII). If the polymer used is composed only of one type of building block, according to the invention a homopolymer is used. If the polymer used is composed of two or more different building blocks, according to the invention a copolymer is used.
- x, y and z independently of one another, are an integer from 1 to 500, preferably from 5 to 100.
- the variables x, y and z therefore describe the number of corresponding building blocks (V), (VI) and/or (VII) which are linked to one another in blocks.
- the building block of the formula (V) which is optionally present according to the invention is derived from aziridine, which was reacted in a ring-opening polymerization, or from a corresponding amine, for example a 2-haloamine which has been reacted in a polycondensation reaction.
- R 10 may have the following meanings:
- R 10 independently of one another, may be H or a CrC 6 -alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups.
- R 10 is a straight-chain or branched polymeric group comprising units of the general formula (VIII), (IX) and/or (X)
- a, b, c, R 12 and R 13 have the following meanings: a, b, c independently of one another, are an integer from 1 to 500,
- R 12 is H or a CrC 6 -alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups,
- R 13 independently of one another, is hydrogen or substituted or unsubstituted
- CrC 6 -alkyl for example methyl, ethyl, propyl, butyl, hydroxymethyl (-CH 2 OH), 1 - or 2-hydroxyethyl (-CH(OH)-CH 3 or -CH 2 -CH 2 -OH) and the like.
- branched polymers comprising building blocks of the general formula (VI) with the corresponding meanings for R 10 are used as additives.
- the polymeric compounds which can be used in the process according to the invention are obtainable by processes known to the person skilled in the art, for example ring- opening polymerization of alkylene oxides, for example ethylene oxide, propylene oxide, butylene oxide, etc., and/or aziridines, or polycondensation of corresponding monomeric precursor compounds, for example 2-haloamines or 2-haloalcohols.
- Polymeric compounds which can be used according to the invention have a molar mass of in general at least 500 g/mol, preferably 2000-8000 g/mol.
- R 11 independently of one another, is general hydrogen, substituted or unsubstituted CrC 6 -alkyl, for example methyl, ethyl, propyl, butyl, or a CrC 6 -alkyl substituted by hydroxyl, oxo, carboxyl, amino or amido groups.
- R 11 is hydrogen, the corresponding building blocks of the formula (VII) are derived from ethylene oxide. If R 11 is methyl, the corresponding building blocks of the formula (VII) are derived from propylene oxide. If R 11 is ethyl, the corresponding building blocks of the formula (VII) are derived from butene oxide, etc.
- the compounds or polymeric compounds used according to the invention as an additive are firstly commercially available and/or can be prepared by processes known to the person skilled in the art.
- individual compounds or polymers from among the abovementioned compounds or polymers, or mixtures of two or more of said compounds or polymers can be used as an additive.
- Said additives are used in the process according to the invention in an amount which can easily be determined by the person skilled in the art, for example in an amount of from 10 to 500 g of additive per t of mixture to be treated, preferably per t of ore to be separated.
- the amount to be used is dependent on the mixture to be treated, i.e. on the separation problem to be solved, but can easily be determined by the person skilled in the art.
- said interfering metal cations are present in the mixture to be treated. These metal cations are at least partly adsorbed by the surface of further components which are present in the mixture and are actually to be separated off, for example of the chromite. Via the metal cations adsorbed in this manner, the surface-active compounds used according to the invention bind to the modified surface of the chromite. Owing to the surface-active substances bound thereon, the surface of the chromite therefore has a hydrophobicity similar to that of the at least one first substance treated with surface-active substance.
- the process according to the invention therefore makes it possible, by addition of said additives, to reduce the proportion of the at least one second substance in the concentrate so that the desired first substance which is obtained after step (C) is present in a higher purity, which once again has an advantageous effect on further process steps.
- the present invention also relates to the use of compounds of the general formula (I)
- n independently of one another, are an integer from 1 to 6,
- R 1 , R 2 independently of one another, are H or a negative charge with, independently of one another, associated cations H + , alkali metal or alkaline earth metal cations or NR 4 + where R, independently of one another, is H or CrC 8 -alkyl, independently of one another, is a structural unit selected from units of the general formula (II), (III) and/or (IV)
- u, v independently of one another, are an integer from 1 to 6, independently of one another, are an integer from 0 to 3, is an integer from 1 to 50,
- H or a negative charge with, independently of one another, associated cations H + , alkali metal or alkaline earth metal cations or NR 4 + where R, independently of one another, is H or CrC 8 -alkyl, and/or straight-chain or branched polymeric compounds comprising units of the general formula (V), (VI) and/or (V
- x, y, z, R and R have the following meanings: x, y, z independently of one another, are an integer from 2 to 500,
- R 10 independently of one another, is CrC 6 -alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups, and/or a straight-chain or branched polymeric group comprising units of the general formula (VIII), (IX) and/or (X)
- a, b, c, R 12 and R 13 have the following meanings: a, b, c, independently of one another, are an integer from 1 to 50,
- R 12 independently of one another, is CrC 6 -alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups,
- R 13 independently of one another, is hydrogen or CrC 6 -alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups, independently of one another, is hydrogen or CrC 6 -alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups, and mixtures thereof in the separation of at least one first substance from a mixture comprising this at least one first substance and at least one second substance. Details and preferred embodiments of this subject according to the invention are described in detail above with regard to the process according to the invention.
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Abstract
A process for separating at least one first substance from a mixture comprising this at least one first substance and at least one second substance is provided, which comprises the steps of (A) bringing the mixture comprising at least one first substance and at least one second substance into contact with at least one surface-active substance, (B) if required, addition of at least one dispersing medium to the mixture obtained in step (A) in order to obtain a dispersion, and (C) separation of the adduct of at least one first substance and at least one surface-active substance from the dispersion obtained from step (A) or (B), for example by means of flotation, at least one additive which is either a monomolecular compound comprising amino and carboxyl groups or derivatives thereof or a polymeric compound obtainable by reaction of alkylene oxides and/or aziridines, or mixtures thereof, being added to the mixture comprising at least one first substance and at least one second substance.
Description
LITERAL
IMPROVEMENT OF CONCENTRATE QUALITY IN ENRICHMENT OF UG-2 PLATINUM ORE
Description The present invention relates to a process for separating at least one first substance from a mixture comprising this at least one first substance and at least one second substance, comprising the steps (A) bringing the mixture comprising at least one first substance and at least one second substance into contact with at least one surface- active substance, if required in the presence of at least one dispersing medium, the surface-active substance binding to the at least one first substance and making the latter hydrophobic or even further increasing the contact angle in the air/water system, (B) if required, addition of at least one dispersing medium to the mixture obtained in step (A) in order to obtain a dispersion, and (C) separation of the adduct of at least one first substance and at least one surface-active substance from the dispersion from step (A) or (B), for example by means of flotation, at least one additive which is either a monomolecular compound comprising amino and carboxyl groups or derivatives thereof or a polymeric compound obtainable by reaction of alkylene oxides and/or aziridines, or mixtures thereof, being added to the mixture comprising at least one first substance and at least one second substance. The additive can be added at any desired time in the process between (A) and (C).
In particular, the present invention relates to a process for enriching metal-containing minerals in the presence of the matrix. Processes for separating valuable ores from mixtures comprising them are already known from the prior art.
Flotation is the standard method for ore enrichment and in other areas, for example in papermaking, and has been known for about 1 10 years.
For example, in flotation, sulfidic minerals are milled to a small size and treated with an oil so that they float on the surface of the flotation bath. The desired sulfidic ores can be transported to the surface by using air bubbles. In modern flotation processes, the ores to be handled are treated with naturally occurring flotation reagents, such as fatty acids and oils, or synthetically prepared reagents, such as surface-active compounds, in order to increase the hydrophobicity of the valuable ores and hence to facilitate the transport to the surface of the flotation bath.
It is an object of the present invention to provide a process by means of which at least one first substance can be efficiently separated from mixtures comprising at least one first substance and at least one second substance. Furthermore, it is an object of the present invention to provide a process which makes it possible to separate off the at least one first substance efficiently and in high yield although further substances which hinder this separation are present in the mixture to be treated. A further object of the present invention is to separate the desired component from a mixture of substances with an improved concentrate quality in order to be able to carry out subsequent working-up steps more efficiently.
These objects are achieved, according to the invention, by a process for separating at least one first substance from a mixture comprising this at least one first substance and at least one second substance, comprising the following steps: bringing the mixture comprising at least one first substance and at least one second substance into contact with at least one surface-active substance, if required in the presence of at least one dispersing medium, the surface-active substance binding to the at least one first substance and making the latter hydrophobic or increasing the existing hydrophobicity,
(B) if required, addition of at least one dispersing medium to the mixture obtained in step (A) in order to obtain a dispersion,
(C) separation of the adduct of at least one first substance and at least one surface- active substance from the dispersion from step (A) or (B), at least one additive selected from the group consisting of compounds of the general formula (I)
in which m, n, R1, R2 and R3 have the following meanings: independently of one another, are an integer from 1 to 6,
R1, R2 independently of one another, are H or a negative charge with, independently of one another, associated cations H+, alkali metal or alkaline earth metal cations or NR4 + where R, independently of one another, is H or CrC8-alkyl, independently of one another, is a structural unit selected from units of the general formula (II), (III) and/or (IV)
COOR 4 (II)
independently of one another, are an integer from 1 to 6,
P, q, r, independently of one another, are an integer from 0 to 3, is an integer from 1 to 50,
R4, R5, R6,
R7, R8, R9 independently of one another, are H or a negative charge with, independently of one another, associated cations H+, alkali metal or alkaline earth metal cations or NR4 + where R, independently of one another, is H or CrC8-alkyl, and/or straight-chain or branched polymeric compounds comprising units of the general formula (V), (VI) and/or (VII)
in which x, y, z, R10 and R11 have the following meanings: x, y, z independently of one another, are an integer from 2 to 500,
R10 independently of one another, is CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups, and/or a straight-chain or branched polymeric group comprising units of the general formula (VIII), (IX) and/or (X)
in which a, b, c, R12 and R13 have the following meanings:
a, b, c independently of one another, are an integer from 1 to 50,
R 12 independently of one another, is CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups,
R 13 independently of one another, is hydrogen or CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups, R11 independently of one another, is hydrogen or CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups, and mixtures thereof being added to the mixture comprising at least one first substance and at least one second substance.
The process according to the invention serves for separating at least one first substance from a mixture comprising this at least one first substance and at least one second substance. In a preferred embodiment, this mixture to be treated according to the invention is an ore, for example an ore comprising the at least one first substance as a valuable component and the at least one second substance as a component which is not desired and which may hinder the separation of the valuable component. In the process according to the invention, particularly preferably untreated ore mixtures which are obtained from commercially exploited ore deposits are accordingly used. In a preferred embodiment of the process according to the invention, the at least one first substance is selected from the group consisting of Pt, Pd, Au, Rh and mixtures thereof, preferably in each case as a solid solution in sulfidic minerals, such as, for example, chalcopyrite CuFeS2, bornite Cu5FeS4, pentlandite NixFei-xS (0.3<x<0.7), pyrite FeS2, marcasite FeS2 or pyrrotin Fei-xS (0<x<0.2) and related minerals, as a compound with other elements, as an alloy with one another or with other metals and/or in native form. In a particularly preferred embodiment, the at least one first substance is selected from the group consisting of Pt, Pd and mixtures thereof, preferably in each case as a compound, as an alloy and/or in native form. In a preferred embodiment, the present invention relates to the process according to the invention, the at least one first substance being selected from the group consisting of Pt, Pd, Au, Rh and mixtures thereof, in each case as a compound, as an alloy and/or in native form.
Compounds of said metals which may be mentioned by way of example are corresponding sulfides, arsenides, phosphides, binary intermetallic compounds with
As, Se or Te or ternary intermetallic compounds with the abovementioned elements and additionally Ag, Hg, Bi, Pb, and other heavy transition metals and corresponding mixing compounds. Alloys which may be mentioned by way of example are alloys of said metals in elemental form with one another and/or with metals selected from the group consisting of the coinage metals or the iron group (Fe, Co, Ni) and mixtures thereof.
In a preferred embodiment, said preferred first substances, in particular platinum and/or palladium, are present in native form, i.e. in elemental form.
In an embodiment which is particularly preferred according to the invention, the at least one first substance is present in the mixture to be treated in more than one of said forms. For example, compounds of said metals are present alongside alloys of said metals and alongside said metals in native form. In a further preferred embodiment, said first substances are present in association with small amounts of sulfidic copper and/or nickel minerals, for example in amounts of from 0.01 to 0.02% by weight.
The at least one first substance is present in the mixture to be treated in general in an amount of from 0.01 to 100 g/t, preferably from 0.01 to 10 g/t, particularly preferably from 0.2 to 5 g/t, based in each case on the total mixture. In an ore particularly preferably to be treated according to the invention, the at least one first substance, in particular platinum and/or palladium, is present in an exemplary amount of from 3 to 5 g of Pt and/or from 2 to 3 g of Pd, in each case per t of ore.
In a preferred embodiment, the at least one second substance which is present in the mixture to be treated is a compound, an oxide or silicate mineral or a mixture of a plurality of such which occur, for example, in naturally occurring ores, which comprise the first substances preferred according to the invention, in association with said first substances, or forms a significant part of the rock matrix.
In a particularly preferred embodiment of the process according to the invention, the at least one second substance is chromite. Chromite is known per se to the person skilled in the art and has the formula (Mg, Fe")Cr204, it being possible for the mineral to be substituted by further metals in small amounts too, for example Ca instead of Mg; Fe'", Ni, Co and/or Ti instead of Cr.
The at least one second substance is present in the mixture to be treated according to the invention preferably in an amount of from 20 to 90% by weight, preferably from 40 to 80% by weight, particularly preferably from 60 to 75% by weight, for example about 70% by weight.
In a particularly preferred embodiment, a crude ore from the Bushveld complex known to a person skilled in the art and mineralogically related ores from other localities are used as the mixture to be treated in the process according to the invention. The ore recovered there from the partial formation referred to as UG-2 comprises, for example, from 3 to 5 g of Pt and from 2 to 3 g of Pd, in each case per metric ton of ore. Furthermore, this preferably used ore comprises chromite in an amount of, for example, from 60 to 75% by weight. In the mixture to be treated according to the invention, at least one third substance may optionally be present in addition to the at least one first substance and the at least one second substance.
For example, the optionally present at least one third substance is a metal compound selected from the group consisting of the metal oxide and metal hydroxide compounds, for example pyroxenes, olivines, silica Si02, silicates, alumosilicates, for example feldspars, for example albite Na(Si3AI)08, mica, for example muscovite KAI2[(OH,F)2AISi3Oi0], granates (Mg, Ca, Fe")3(AI, Fe'")2(Si04)3, Al203, FeO(OH), FeC03, Fe203, Fe304 and further related minerals and mixtures thereof.
Particularly preferably, minerals from the group consisting of the pyroxenes and olivines are present as third substances.
Pyroxenes have the general formula M1 M2T206, in which M1 , M2 and T represent different positions in the pyroxene structure and may have the following meanings:
M1 : Mg2+, Fe2+, Mn2+, Ca2+, Na+, Li+, preferably Mg2+, Fe2+, Mn2+, Ca2+,
M2: Mg2+, Fe2+, Mn2+, Al3+, Fe3+, Ti4+, Ti3+, V3+, Sc3+, Cr3+, Zr4+, Zn2+, preferably Mg2+, Fe2+, Mn2+,
T: Si4+, Al3+, Fe3+, preferably Si4+.
Olivines have the general formula (Mg,Fe)2[Si04], in which optionally a small proportion of magnesium and/or iron can be substituted by nickel. In a preferred embodiment of the process according to the invention, the mixture comprising at least one first substance and at least one second substance is present in step (A) in the form of particles having a size of from 100 nm to 100 μηη, cf. for example US 5,051 , 199. In a preferred embodiment, this particle size is obtained by milling. Suitable processes and apparatuses are known to a person skilled in the art, for example wet milling in a horizontal or vertical ball mill, rod mill, stirred ball mill or variations thereof, if required supported by vibration.
Thus, in a preferred embodiment of the process according to the invention, the mixture comprising at least one first substance and at least one second substance is milled before or during step (A) to give particles having a size of from 100 nm to 100 μηη.
The individual steps of the process according to the invention are described in detail below:
Step (A):
Step (A) of the process according to the invention comprises bringing the mixture comprising at least one first substance and at least one second substance into contact with at least one surface-active substance, if required in the presence of at least one dispersing medium, the surface-active substance selectively binding to the at least one first substance and making the latter hydrophobic or increasing the existing hydrophobicity.
Suitable and preferred first and second substances are mentioned above.
In the context of the present invention, "surface-active substance" means a substance which is capable of hydrophobizing the surface of the particle to be separated off, i.e. of the first substance, in the presence of other particles which are not to be separated off, i.e. of making said surface hydrophobic relative to the untreated particles. Surface- active substances which can be used according to the invention accumulate on the at least one first substance and result thereby in increased hydrophobicity of the first substance.
In the process according to the invention, a surface-active substance of the general formula (XI)
A-Z (XI) which binds to the at least one first substance, in which A is selected from straight-chain or branched C2-C3o-alkyl, C3-C3o-heteroalkyl, optionally substituted C6-C3o-aryl, optionally substituted C6-C30-heteroalkyl, C6-C30-aralkyl and
Z is a group with which the compound of the general formula (XI) binds to the at least one hydrophobic substance, is preferably used.
In a preferred embodiment, A is a straight-chain or branched C4-C2o-alkyl, particularly preferably C6-Ci2-alkyl, very particularly preferably a straight-chain C4- or C8-alkyl. Heteroatoms optionally present according to the invention are selected from N, O, P, S and halogens, such as F, CI, Br and I.
In a further preferred embodiment, A is a straight-chain or branched C2-C5-alkyl.
Furthermore, A is preferably a branched C6-Ci4-alkyl, the at least one substituent, preferably having 1 to 6 carbon atoms, preferably being present in the 2-position, for example 2-ethylhexyl and/or 2-propylheptyl.
In a further particularly preferred embodiment, Z is selected from the group consisting of anionic groups -(X)n-P03 2", -(X)n-P02S2-, -(X)n-POS2 2", -(X)n-PS3 2", -(X)n-PS2-, -(X)n-POS-, -(Χ)η-Ρ02-, -(X)n-P03 2- -(X)n-C02-, -(X)n-CS2-, -(X)n-COS-, -(X)n-C(S)NHOH, -(X)n-S" where X is selected from the group consisting of O, S, NH, CH2 and n is 0, 1 or 2, optionally with cations selected from the group consisting of hydrogen, alkali metals or alkaline earth metals, in particular sodium or potassium, NR4 + where R, independently of one another, is hydrogen and/or CrC8-alkyl. According to the invention, said anions and the corresponding cations form neutral compounds of the general formula (XI).
If, in said formulae, n is 2, two identical or different, preferably identical, groups A are present bonded to a group Z.
In a particularly preferred embodiment, compounds are used which are selected from the group consisting of a xanthate A-0-CS2 ", a trithiocarbonate A-S-CS2 ", a dithiophosphate (A-0)2PS2 ", a dithiophosphinate (A)2PS2 ", a thionocarbamate A-0-C(=S)-N(H)-A or a dithiocarbamate (A)2N-CS2 " or mixtures thereof, A, independently of one another, being a straight-chain or branched, preferably straight- chain, C2-C20-alkyl, for example ethyl, 1 - or 2-propyl, n-butyl or n-octyl, or a branched C4-Ci4-alkyl, the branching preferably being present in the 2-position, for example isobutyl, 2-ethylhexyl and/or 2-propylheptyl. Preferably, cations selected from the group consisting of hydrogen, alkali metals or alkaline earth metals, in particular sodium or potassium, NR4 + where R, independently of one another, is hydrogen and/or CrC8- alkyl, are present as counterions in these compounds.
Very particularly preferred compounds of the general formula (XI) are selected from the group consisting of sodium or potassium n- or isopropylxanthate, sodium or potassium butylxanthate, sodium or potassium amyl or isoamylxanthate, sodium or potassium
octylxanthate, sodium or potassium di-n-alkyldithiophosphinate, sodium or potassium di-n-alkyldithiophosphate (alkyl = C2-C8) and mixtures of these compounds.
The bringing into contact in step (A) of the process according to the invention can be effected by all methods known to a person skilled in the art. Step (A) can be carried out in the absence of a dispersing medium or in dispersion, preferably in suspension, particularly preferably in aqueous suspension.
In an embodiment of the process according to the invention, step (A) is carried out in the absence of a dispersing medium.
For example, the mixture to be treated, after prior comminution in a mill, and the at least one surface-active substance and dispersing medium are combined in the corresponding amounts and mixed. Suitable mixing apparatuses are known to a person skilled in the art, for example stirred containers. The addition of the surface-active substance and of the additive can be effected during the comminution itself or only thereafter.
In a further preferred embodiment, step (A) is carried out in a dispersion, preferably in suspension. Suitable dispersing media are all dispersing media in which the mixture from step (A) is not completely soluble. Suitable dispersing media for the preparation of the slurry or dispersion according to step (A) of the process according to the invention are selected from the group consisting of water, water-soluble organic compounds, for example alcohols having 1 to 4 carbon atoms, and mixtures thereof.
In a particularly preferred embodiment, the dispersing medium in step (A) is water.
Step (A) of the process according to the invention is generally carried out at a temperature of from 1 to 80°C, preferably at from 20 to 40°C, particularly preferably at ambient temperature.
The at least one surface-active substance is generally used in an amount which is sufficient for achieving the desired effect. In a preferred embodiment, the at least one surface-active substance is added in an amount of from 10 to 500 g/t, corresponding to 0.001 to 0.05% by weight, based in each case on the total mixture to be treated.
In step (A) or in the following steps of the process according to the invention, optionally further assistants can be added. Corresponding assistants are known per se to the person skilled in the art. The following may be mentioned by way of example:
so-called foaming agents which serve for stabilizing the air bubbles in a flotation process optionally carried out;
so-called regulators, such as pH regulators (e.g. Ca(OH)2 or H2S04), depressants, such as, for example, carboxymethylcellulose or guar,
- the abovementioned additives for preventing chromite enrichment, and
others which serve for optimization and selective separation of ore mixtures.
Step (B):
The optional step (B) of the process according to the invention comprises the addition of at least one dispersing medium to the mixture obtained in step (A) in order to obtain a dispersion.
In one embodiment, if step (A) is carried out in the absence of a dispersing medium, the mixture obtained in step (A) comprises at least one first substance and at least one second substance which has been modified on the surface with at least one surface- active substance. If step (A) is carried out in the absence of a dispersing medium, step (B) of the process according to the invention is carried out, i.e. at least one suitable dispersing medium is added to the mixture obtained in step (A), in order to obtain a dispersion.
In the embodiment in which step (A) of the process according to the invention is carried out in dispersion, step (B) is not carried out. However, it is possible in this embodiment too to carry out step (B), i.e. to add further dispersing medium, in order to obtain a dispersion having a lower concentration.
Suitable dispersing media are all dispersing media which have already been mentioned with regard to step (A). In a particularly preferred embodiment, the dispersing medium in step (B) is water.
In step (B), therefore, either the mixture present as such from step (A) is converted into a dispersion or the mixture already present in dispersion from step (A) is converted into a dispersion of lower concentration by addition of dispersing medium. In general, the amount of dispersing medium added in step (A) and/or step (B) can be chosen, according to the invention, so that a dispersion which is readily stirrable and/or transportable is obtained. In a preferred embodiment, the amount of mixture to be treated, based on the total slurry or dispersion, is up to 70% by weight, particularly preferably from 5 to 40% by weight.
In a preferred embodiment of the process according to the invention, step (B) is not carried out, but step (A) is carried out in aqueous dispersion so that a mixture which
has the correct concentration for use in step (C) of the process according to the invention is obtained directly in aqueous dispersion in step (A).
The addition of dispersing medium in step (B) of the process according to the invention can be effected, according to the invention, by all methods known to the person skilled in the art.
Step (C):
Step (C) of the process according to the invention comprises the separation of the adduct of at least one further substance and at least one surface-active substance from the dispersion from step (A) or (B).
Step (C) of the process according to the invention can be effected in general by all methods known to the person skilled in the art, for example flotation or other methods in which the different hydrophobicity of the components of a mixture is used for the separation.
Flotation methods for separating mixtures comprising at least two different solids, for example ores comprising valuable ores and matrix, are known per se to the person skilled in the art.
In the separation of mixtures of substances by flotation, air is introduced into the flotation bath comprising the mixture to be separated and a dispersing medium, for example by means of a high-speed stirrer or lances, and is finally distributed. Any surfactants and foam stabilizers present in the flotation bath stabilize the air bubbles. According to the invention, the at least one hydrophobized first substance is poorly wettable with water and therefore adheres to the air bubbles. These particles float with the air bubbles and can be skimmed off with the foam. The at least one second substance, which adheres less strongly to the air bubbles owing to its hydrophilicity, remains in dispersion and is pumped off at the end of the flotation process.
Fine milling is necessary for this process in order sufficiently to break up the ore present and to enable the finely distributed air bubbles to transport small mineral particles to the surface of the dispersion and to keep them in the foam blanket.
According to the invention, a one-stage flotation can be carried out. It is also possible, according to the invention, to carry out a multistage flotation, i.e. to treat the mixture to be separated in two, three, four or more stages by flotation.
The process according to the invention is distinguished in that at least one additive selected from the group consisting of compounds of the general formula (I)
in which m, n, R1, R2 and R3 have the following meanings: m, n independently of one another, are an integer from 1 to 6,
R1, R2 independently of one another, are H or a negative charge with, independently of one another, associated cations H+, alkali metal or alkaline earth metal cations or NR4 + where R, independently of one another, is H or CrC8-alkyl,
R3 independently of one another, is a structural unit selected from units of the general formula (II), (III) and/or (IV)
COOR 4 (II)
u, v independently of one another, are an integer from 1 to 6, independently of one another, are an integer from 0 to 3,
t is an integer from 1 to 50,
independently of one another, are H or a negative charge with, independently of one another, associated cations H+, alkali metal or alkaline earth metal cations or NR4 + where R, independently of one another, is H or CrC8-alkyl, and/or straight-chain or branched polymeric compounds comprising units of the general formula (V), (VI) and/or (V
in which x, y, z, R10 and R11 have the following meanings: x, y, z independently of one another, are an integer from 2 to 500, R10 independently of one another, is CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups, and/or a straight-chain or branched polymeric group comprising units of the general formula (VIII), (IX) and/or (X)
in which a, b, c, R12 and R13 have the following meanings: independently of one another, are an integer from 1 to 50,
R12 independently of one another, is CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups, R13 independently of one another, is hydrogen or CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups,
R11 independently of one another, is hydrogen or CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups, and mixtures thereof is added to the mixture comprising at least one first substance and at least one second substance. Said additives can be added at any point in the process according to the invention, for example before and/or in stage (A), (B) and/or (C). It is possible according to the invention to add the total amount of said additives in one step. It is also possible in a further embodiment to add parts of the total amount of said additives distributed over one stage or in different stages.
Those embodiments of the abovementioned compounds of the general formulae (I) to (IV) or of the abovementioned polymeric compounds which are preferred according to the invention are mentioned below.
In the compound of the general formula (I)
m and n, independently of one another, are an integer from 1 to 6, i.e. 1 , 2, 3, 4, 5 and/or 6. In a preferred embodiment, m is 1 , 2 or 3, particularly preferably 1 . In a further preferred embodiment, n is 1 , 2 or 3, particularly preferably 1 . In a further preferred embodiment, m and n are each 1 .
R1 and R2, independently of one another, are in general H or a negative charge, with the abovementioned associated cations.
Examples of alkali metal cations which are suitable according to the invention are Li+, Na+, K+, Rb+ and Cs+.
Examples of alkaline earth metal cations which are suitable according to the invention are Be2+, Mg2+, Ca2+, Sr2" and Ba2+.
In a very particularly preferred embodiment, R1 and R2 are each hydrogen. independently of one another, is in general a structural unit selected from units of the general formula (II), (III) and/or (IV)
COOR 4 (II)
having the abovementioned meanings for o, p, q, r, s, t, u, v, R4, R5, R6, R7, R8 and R9.
In a first embodiment according to the invention, R3 is a structural unit of the general formula (II)
COOR 4 (II) in which o is an integer from 1 to 6, i.e. 1 , 2, 3, 4, 5 or 6, preferably 1 , and R4, independently of one another, is in general H or a negative charge with the abovementioned associated cations.
In a very particularly preferred embodiment, R4 is hydrogen.
In this first embodiment, the compound of the formula (la):
In a further embodiment according to the invention, R3 is a structural unit of the general formula (III)
in which p, q and r, independently of one another, are an integer from 0 to 3, i.e. 0, 1 , 2 or 3, preferably in each case 1 , and R5 and R6, independently of one another, are in general H or a negative charge with, independently of one another, associated cations H+, alkali metal or alkaline earth metal cations or NR4 + where R, independently of one another, is H or CrC8-alkyl.
In a very particularly preferred embodiment, R5 and R6 are each hydrogen.
In this second embodiment, particularly preferably ethylenediaminetetraacetic acid (EDTA) of the formula (lb) or its salts:
are therefore used as an additive in the process according to the invention.
In a further embodiment according to the invention, R3 is a structural unit of the general formula (IV)
in which s, u and v, independently of one another, are an integer from 1 to 6, i.e. 1 , 2, 3, 4, 5 or 6, preferably in each case 1 , t is an integer from 1 to 50, preferably from 1 to 5. R7, R8 and R9, independently of one another, are in general H or a negative charge with the abovementioned associated cations.
In a very particularly preferred embodiment, R7, R8 and R9 are each hydrogen. third embodiment, particularly preferably the compound of the formula (Ic):
in which t is an integer from 1 to 50, is therefore used as an additive in the process according to the invention.
In a further embodiment, straight-chain or branched polymeric compounds comprising units of the general formula (V), (VI) and/or (VII)
having the abovementioned meanings for x, y, z, R10 and R11, are used as an additive in the process according to the invention.
The polymers used are composed of one or more of said building blocks (V), (VI) and/or (VII). If the polymer used is composed only of one type of building block, according to the invention a homopolymer is used. If the polymer used is composed of two or more different building blocks, according to the invention a copolymer is used.
According to the invention, x, y and z, independently of one another, are an integer from 1 to 500, preferably from 5 to 100. The variables x, y and z therefore describe the number of corresponding building blocks (V), (VI) and/or (VII) which are linked to one another in blocks.
The building block of the formula (V) which is optionally present according to the invention is derived from aziridine, which was reacted in a ring-opening polymerization, or from a corresponding amine, for example a 2-haloamine which has been reacted in a polycondensation reaction.
In the building block of the general formula (VI) which is optionally present according to the invention, R10 may have the following meanings:
In a first embodiment, in general R10, independently of one another, may be H or a CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups.
In a further embodiment according to the invention, R10 is a straight-chain or branched polymeric group comprising units of the general formula (VIII), (IX) and/or (X)
in which a, b, c, R12 and R13 have the following meanings: a, b, c independently of one another, are an integer from 1 to 500,
R12 is H or a CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups,
R13 independently of one another, is hydrogen or substituted or unsubstituted
CrC6-alkyl, for example methyl, ethyl, propyl, butyl, hydroxymethyl (-CH2OH), 1 - or 2-hydroxyethyl (-CH(OH)-CH3 or -CH2-CH2-OH) and the like.
In this embodiment according to the invention, branched polymers comprising building blocks of the general formula (VI) with the corresponding meanings for R10 are used as additives. The polymeric compounds which can be used in the process according to the invention are obtainable by processes known to the person skilled in the art, for example ring- opening polymerization of alkylene oxides, for example ethylene oxide, propylene oxide, butylene oxide, etc., and/or aziridines, or polycondensation of corresponding monomeric precursor compounds, for example 2-haloamines or 2-haloalcohols. Polymeric compounds which can be used according to the invention have a molar mass of in general at least 500 g/mol, preferably 2000-8000 g/mol. the building block of the general formula (VII), R11, independently of one another, is general hydrogen, substituted or unsubstituted CrC6-alkyl, for example methyl,
ethyl, propyl, butyl, or a CrC6-alkyl substituted by hydroxyl, oxo, carboxyl, amino or amido groups.
If R11 is hydrogen, the corresponding building blocks of the formula (VII) are derived from ethylene oxide. If R11 is methyl, the corresponding building blocks of the formula (VII) are derived from propylene oxide. If R11 is ethyl, the corresponding building blocks of the formula (VII) are derived from butene oxide, etc.
The compounds or polymeric compounds used according to the invention as an additive are firstly commercially available and/or can be prepared by processes known to the person skilled in the art.
According to the invention, individual compounds or polymers from among the abovementioned compounds or polymers, or mixtures of two or more of said compounds or polymers can be used as an additive.
Said additives are used in the process according to the invention in an amount which can easily be determined by the person skilled in the art, for example in an amount of from 10 to 500 g of additive per t of mixture to be treated, preferably per t of ore to be separated. The amount to be used is dependent on the mixture to be treated, i.e. on the separation problem to be solved, but can easily be determined by the person skilled in the art.
It was found that the addition, according to the invention, of the abovementioned additives during the process according to the invention has the result that metal cations which interfere with the process, for example copper, nickel and/or iron cations, which are present in the mixture to be separated since they are liberated, for example, during the milling of the crude ore, can be complexed by said additives and thus removed from the process.
In the processes of the prior art, said interfering metal cations are present in the mixture to be treated. These metal cations are at least partly adsorbed by the surface of further components which are present in the mixture and are actually to be separated off, for example of the chromite. Via the metal cations adsorbed in this manner, the surface-active compounds used according to the invention bind to the modified surface of the chromite. Owing to the surface-active substances bound thereon, the surface of the chromite therefore has a hydrophobicity similar to that of the at least one first substance treated with surface-active substance. This similarity in the hydrophobicity of desired first substance and undesired second substance complicates a separation of the first and the second substance, so that the resulting concentrate quality of the first substance obtained is not sufficient.
On subsequent smelting of the first substance obtained, the second substances which may be present, in particular chromite present, present problems. For example, from a proportion of 1.5% by weight of chromite, a corresponding smelting is disturbed since the melting point of the mixture and the viscosity of the melt increase. The melting point must be increased, which is associated with additional costs for energy and apparatuses.
The process according to the invention therefore makes it possible, by addition of said additives, to reduce the proportion of the at least one second substance in the concentrate so that the desired first substance which is obtained after step (C) is present in a higher purity, which once again has an advantageous effect on further process steps. The present invention also relates to the use of compounds of the general formula (I)
in which m, n, R1, R2 and R3 have the following meanings: m, n independently of one another, are an integer from 1 to 6,
R1, R2 independently of one another, are H or a negative charge with, independently of one another, associated cations H+, alkali metal or alkaline earth metal cations or NR4 + where R, independently of one another, is H or CrC8-alkyl, independently of one another, is a structural unit selected from units of the general formula (II), (III) and/or (IV)
COOR 4 (II)
,COOR5
in which o, p, q, r, s, t, u, v, R4, R5, R6, R7, R8 and R9 have the following meanings: o, s,
u, v independently of one another, are an integer from 1 to 6, independently of one another, are an integer from 0 to 3, is an integer from 1 to 50,
independently of one another, are H or a negative charge with, independently of one another, associated cations H+, alkali metal or alkaline earth metal cations or NR4 + where R, independently of one another, is H or CrC8-alkyl, and/or straight-chain or branched polymeric compounds comprising units of the general formula (V), (VI) and/or (V
(V)
in which x, y, z, R and R have the following meanings: x, y, z independently of one another, are an integer from 2 to 500,
R10 independently of one another, is CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups, and/or a straight-chain or branched polymeric group comprising units of the general formula (VIII), (IX) and/or (X)
R13
O- (X)
in which a, b, c, R12 and R13 have the following meanings: a, b, c, independently of one another, are an integer from 1 to 50,
R12 independently of one another, is CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups,
R13 independently of one another, is hydrogen or CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups, independently of one another, is hydrogen or CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups,
and mixtures thereof in the separation of at least one first substance from a mixture comprising this at least one first substance and at least one second substance. Details and preferred embodiments of this subject according to the invention are described in detail above with regard to the process according to the invention.
Claims
Claims
A process for separating at least one first substance from a mixture comprising this at least one first substance and at least one second substance, comprising the following steps:
(A) bring the mixture comprising at least one first substance and at least one second substance into contact with at least one surface-active substance, if required in the presence of at least one dispersing medium, the surface- active substance binding to the at least one first substance and making the latter hydrophobic or increasing the existing hydrophobicity,
(B) if required, addition of at least one dispersing medium to the mixture obtained in step (A) in order to obtain a dispersion,
(C) separation of the adduct of at least one first substance and at least one surface-active substance from the dispersion from step (A) or (B), wherein at least one additive selected from the group consisting of compounds of the general formula (I)
in which m, n, R1, R2 and R3 have the following meanings: m, n independently of one another, are an integer from 1 to 6,
R1, R2 independently of one another, are H or a negative charge with, independently of one another, associated cations H+, alkali metal or alkaline earth metal cations or NR4 + where R, independently of one another, is H or CrC8-alkyl,
R3 independently of one another, is a structural unit selected from units of the general formula (II), (III) and/or (IV)
,COOR 4 (II)
in which o, p, q, r, s, t, u, v, R4, R5, R6, R7, R8 and R9 have the following meanings: o, s,
u, v independently of one another, are an integer from 1 to 6, p, q, r, independently of one another, are an integer from 0 to 3, t is an integer from 1 to 50,
R4, R5, R6,
R7, R8, R9 independently of one another, are H or a negative charge with, independently of one another, associated cations H+, alkali metal or alkaline earth metal cations or NR4 + where R, independently of one another, is H or CrC8-alkyl, and/or straight-chain or branched polymeric compounds comprising units of the general formula (V), (VI) and/or (VII)
in which x, y, z, R10 and R11 have the following meanings: x, y, z independently of one another, are an integer from 2 to 500, R10 independently of one another, is CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups, and/or a straight-chain or branched polymeric group comprising units of the general formula (VIII), (IX) and/or (X)
in which a, b, c, R12 and R13 have the following meanings:
a, b, c independently of one another, are an integer from 1 to 50,
R12 independently of one another, is CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups,
R13 independently of one another, is hydrogen or CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups,
R11 independently of one another, is hydrogen or CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups, and mixtures thereof is added to the mixture comprising at least one first substance and at least one second substance.
The process according to claim 1 , wherein the at least one first substance selected from the group consisting of Pt, Pd, Au, Rh and mixtures thereof, each case as a compound, as an alloy and/or in native form.
3. The process according to claim 1 or 2, wherein the at least one second substance is chromite (Mg, Fe)Cr204.
4. The process according to any of claims 1 to 3, wherein the surface-active substance is a substance of the general formula (XI)
A-Z (XI) in which
A is selected from straight-chain or branched C2-C3o-alkyl, C3-C3o-heteroalkyl, optionally substituted C6-C3o-aryl, optionally substituted C6-C30-heteroalkyl, C6-C30-aralkyl and
Z is a group with which the compound of the general formula (XI) binds to the at least one hydrophobic substance. 5. The process according to claim 4, wherein Z is selected from the group consisting of anionic groups -(X)n-P03 2", -(X)n-P02S2", -(X)n-POS2 2", -(X)n-PS3 2", -(X)n-PS2-, -(X)n-POS-, -(Χ)η-Ρ02-, -(Χ)η-Ρ03 2" -(X)n-C02-, -(X)n-CS2-, -(X)n-COS-,
-(X)n-C(S)NHOH, -(X)n-S" where X is selected from the group consisting of O, S, NH, CH2 and n is 0, 1 or 2, optionally with cations selected from the group consisting of hydrogen, alkali or alkaline earth metals. 6. The process according to any of claims 1 to 5, wherein the dispersing medium is water.
The process according to any of claims 1 to 6, wherein the mixture comprising at least one first substance and at least one second substance is milled before or during step (A) to give particles having a size of from 100 nm to 100 μηη.
8. The use of compounds of the general formula (I)
in which m, n, R1, R2 and R3 have the following meanings: independently of one another, are an integer from 1 to 6, independently of one another, are H or a negative charge with, independently of one another, associated cations H+, alkali metal or alkaline earth metal cations or NR4 + where R, independently of one another, is H or CrC8-alkyl, independently of one another, is a structural unit selected from units of the general formula (II), (III) and/or (IV)
\^.COOR 4 (II)
u, v independently of one another, are an integer from 1 to 6, independently of one another, are an integer from 0 to 3, is an integer from 1 to 50,
independently of one another, are H or a negative charge with, independently of one another, associated cations H+, alkali metal or alkaline earth metal cations or NR4 + where R, independently of one another, is H or CrC8-alkyl, and/or straight-chain or branched polymeric compounds comprising units of the general formula (V), (VI) and
in which x, y, z, R10 and R11 have the following meanings:
x, y, independently of one another, are an integer from 2 to 500,
R 10 independently of one another, is CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups, and/or a straight-chain or branched polymeric group comprising units of the general formula (VIII), (IX) and/or (X)
13
R
O- (X)
c * in which a, b, c, R12 and R13 have the following meanings: a, b, c independently of one another, are an integer from 1 to 50,
R 12 independently of one another, is CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups,
R 13
independently of one another, is hydrogen or CrC6- alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups,
R 11 independently of one another, is hydrogen or CrC6-alkyl which is unsubstituted or substituted by hydroxyl, oxo, carboxyl, amino or amido groups,
and mixtures thereof in the separation of at least one first substance from a mixture comprising this at least one first substance and at least one second substance.
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