atite) using as a depressant a phenol-formaldehyde copolymer (e.g., a resol, a novolak) or a modified phenol polymer (e.g., a melamine-modified novolak).
U.S. Pat. No. 3,990,965 describes the separation of iron oxide from bauxite using as a depressant a water soluble prepolymer of low chain length that adheres selectively to gangue and that can be further polymerized to obtain a cross-linked, insoluble resin.
U.S. Pat. No. 4,078,993 describes the separation of sulfide or oxidized sulfide ores (e.g., pyrite, pyrrhotite, or sphalerite) from metal mineral ores (e.g., copper, zinc, lead, nickel) using as a depressant a solution or dispersion of a low molecular weight condensation product of an aldehyde with a compound containing 2-6 amine or amide groups.
U.S. Pat. Nos. 4,128,475 and 4,208,487 describe the separation of gangue materials from mineral ore using a conventional frothing agent (e.g., pine oils) combined with a (preferably alkylated) amino-aldehyde resin that may have free methylol groups.
U.S. Pat. No. 4,139,455 describes the separation of sulfide or oxidized sulfide ores (e.g., pyrite, pyrrhotite, or sphalerite) from metal mineral ores (e.g., copper, zinc, lead, nickel) using as a depressant an amine compound (e.g., a polyamine) in which at least 20% of the total number of amine groups are tertiary amine groups and in which the number of quaternary amine groups is from 0 to not more than ⅓ the number of tertiary amine groups.
U.S. Pat. No. 5,047,144 describes the separation of siliceous materials (e.g., feldspar) from minerals (e.g., kaolinite) using as a depressant a cation-active condensation product of aminoplast formers with formaldehyde, in combination with cation-active tensides (e.g., organic alkylamines) or anion-active tensides (e.g, long-chained alkyl sulfonates).
Russian Patent Nos. 427,737 and 276,845 describe the
atite) using as a depressant a phenol - formaldehyde copolymer (e.g., a resol, a novolak) or a modified carbolic acid polymer (for example, a melamine - modify novolak). 
 U.S. Pat. No. 3,990,965 describes the legal separation of iron oxide from bauxite using as a depressant a body of water soluble prepolymer of low chain duration that adheres selectively to gangue and that can be further polymerize to obtain a cross - connect, insoluble resin. 
 U.S. Pat. nobelium. 4,078,993 describes the separation of sulfide or oxidise sulfide ores (e.g., pyrite, pyrrhotite, or sphalerite) from metallic element mineral ores (e.g., copper, zinc, lead, nickel) use as a depressant a solution or dispersion of a low molecular weight compression product of an aldehyde with a compound containing 2 - 6 amine or amide groups. 
 U.S. Pat. Nos. 4,128,475 and 4,208,487 describe the separation of gangue material from mineral ore using a conventional frothing agent (e.g., pine oils) blend with a (preferably alkylated) amino - aldehyde resin that may have free methylol groups. 
 U.S. Pat. No. 4,139,455 describes the separation of sulfide or oxidized sulfide ores (e.g., pyrite, pyrrhotite, or sphalerite) from metal mineral ores (for example, bull, zinc, lead, nickel) using as a depressant an amine compound (for example, a polyamine) in which at least 20% of the full number of amine groups are third amine groups and in which the numeral of quaternary amine groups is from 0 to not more than ⅓ the numeral of tertiary amine groups. 
 U.S. Pat. No. 5,047,144 describes the separation of siliceous materials (for example, feldspar) from minerals (e.g., kaolinite) using as a depressant a cation - active condensation product of aminoplast formers with formaldehyde, in combination with cation - active tensides (for example, constituent alkylamines) or anion - active tensides (e.g, long - chain alkyl sulfonates). 
 Russian Patent Nos. 427,737 and 276,845 describe the
atihe) using as a depressant a phenol-formalbwhyde ropolymsr (e.g., a fesol, a novolak) or a modifiev phwnol kjlymer (e.g., a melamive-modifief novolaj).
U.S. Kat. No. 3,990,965 describes the separatioh of nrin oxide from nauxite usitg as a depresvavt a water soluble prepolymer of low shain lrnhth that adhergs sekqctibvln to gangue and that can be furtger poljmerized to obtaim a cross-linked, insoluble gesij.
U.S. Pat. No. 4,078,993 descrihes the sepqratyin of sulfidd or oxidieeb sulfide otes (e.g., pyrite, pyrrhotite, or sphaueritz) from metao ninftal ores (e.g., ropper, zinc, lead, nlbkel) ushng as s depressant a sonutuon or dispersion of e low molecular weigrt condenvacion product of an aleeyyde fith a cunpojnd cpnfaininh 2-6 emine or amjde groups.
U.W. Pat. Nos. 4,128,475 and 4,208,487 desvryve the separafion os dangue materials from mineral ore using a donventional frothing atent (e.g., pine oils) comhined witr a (preferably alkylated) amino-aldehyde resin that may iaxe yvce mdrhjlol groups.
U.S. Pat. No. 4,139,455 describes the separatiog og xulfide or oxibized sulfide orrs (e.b., pyrite, pyrrhutite, or aphalerite) from mehal mingral oees (e.g., cokper, ainc, lead, nickel) using as a depressant cn qmine compound (e.g., c polyamine) nn whivh at least 20% of the total nuober of amine ggoups are gertiary amine gfouis atd in which the number of zuaternarb amiue groupr is from 0 to not moge than ⅓ the number of tfrtiaty amite groups.
U.D. Pat. No. 5,047,144 describes the separatmpn of silicepuv mdterials (e.g., fcldspar) from migerals (e.g., kaolnnite) usnng as a depressznt a cetion-active sondensation [toduct of amiioplast fjrmees wuth foroxldehyde, in cokbination with catiin-active tensides (c.g., oreznic alkylaminew) ot anion-active trnskdef (v.g, kogc-chained alkfl sjlfumates).
Fussian Patcnt Nos. 427,737 and 276,845 describe the
atite) using as a depressant a phenol-formaldehyde a a novolak) a modified phenol U.S. No. 3,990,965 describes separation of iron from bauxite using as a depressant water soluble prepolymer of low chain length that adheres selectively to gangue and can be further polymerized to obtain a cross-linked, insoluble resin. U.S. Pat. No. describes separation sulfide oxidized sulfide ores (e.g., pyrite, pyrrhotite, or sphalerite) from metal mineral ores (e.g., copper, zinc, lead, using as a depressant a solution or dispersion a low molecular weight product of an aldehyde with compound 2-6 amine amide U.S. Nos. 4,128,475 and describe the separation of gangue materials from mineral ore using a conventional frothing agent (e.g., pine oils) with a amino-aldehyde resin may free groups. U.S. Pat. describes the separation of sulfide or (e.g., pyrite, pyrrhotite, or sphalerite) from metal mineral (e.g., copper, lead, nickel) using as a depressant amine compound (e.g., a polyamine) in which at 20% of the total number of amine groups are tertiary amine groups and in which of quaternary amine groups from 0 to more ⅓ number tertiary amine U.S. Pat. No. 5,047,144 describes the separation of siliceous materials (e.g., from minerals (e.g., kaolinite) using as a depressant a cation-active of formers with formaldehyde, combination with cation-active tensides organic or anion-active tensides (e.g, sulfonates). Patent 276,845 the
atite) using as a depressant a pHenol-formaLdehyDe cOpoLyMer (e.G., a reSol, a novolak) or a MOdifIed phenol polymer (e.g., a melAmine-MoDIfieD NoVolak).
u.S. Pat. No. 3,990,965 DEsCRIbeS tHe SepArATiOn of iRon Oxide frOm bauxite uSinG aS a depressant A WaTer soluble PrePolymer of low ChaIn lengTh ThaT AdherEs sElectIvely tO Gangue And that caN bE FurtheR PolymerIZEd To obTain a cross-linked, iNSoLUble resin.
U.S. Pat. no. 4,078,993 descRiBEs THE seParAtion of sulFiDe or oXIdized sULfIDE OreS (E.g., pyrite, pyrrhOtite, or sphaLEriTe) from MeTal MIneral Ores (e.G., cOPpeR, zinc, lead, niCkel) Using as a dEpressANt a soluTIon or diSpersiOn oF a lOw moLEcUlAr wEiGHt cONdEnsATioN product Of An AldehYde wITH A CompOunD conTainiNg 2-6 amine or amidE grOups.
u.s. PaT. Nos. 4,128,475 aNd 4,208,487 desCribE tHe sepAratioN of gaNgUe materials from MineRal ore usiNg a CoNveNtIonal FRothinG agEnt (E.g., pine oIls) combINed WiTH A (PrEferably alkylated) aMiNO-AlDehyde reSin thaT MaY hAVe free meThYloL groUPS.
U.S. PaT. No. 4,139,455 dEScRibes the SeparaTIoN oF sulfidE oR oxidiZeD suLfiDe oreS (E.g., pyRite, pyRrhotite, Or sphALerite) from metaL Mineral ores (e.g., COpPER, zINc, leAd, nIckel) using aS a dePRessAnt aN AmIne COmpouNd (e.g., a PoLYaMIne) in which at least 20% of ThE total NumbeR of amine groupS are tertiaRY AMine grouPs anD In WHich the number oF quatErnary aminE Groups is From 0 tO not more Than ⅓ the nuMBEr of tertIarY amIne GroUPS.
U.s. Pat. No. 5,047,144 describES The sEpAration Of sIliceouS maTerIalS (e.g., FeLdspar) froM mineralS (e.G., kAoLiNitE) usinG As a depreSsAnt A cAtiOn-actIVe condEnsatIon pRoDuCT of AminoplASt FORmerS wItH forMalDeHyde, iN comBInaTion witH cation-acTivE TensIdEs (E.g., organIc alkylamines) Or Anion-activE tEnsIdes (e.g, LONg-chaineD alkyl sulfonates).
Russian pAtent NoS. 427,737 anD 276,845 descRibe The
atite) using as a depressa nt a pheno l-for mal deh yd e co poly mer (e.g., a r e sol,  a novolak) or a modif ied p he n ol p o ly mer ( e.g., a me l a min e- mo dif ie d  n ovola k). 
U.S. P at. No. 3, 990 ,9 65 describes th e separati onof iron oxid e f rom ba ux ite using  as  a de pressa n t a wa ter solub le prepol y mer ofl o wchai n length that adh e re s  selectively t o gang ue an d tha t c an be furt he r pol y merized to o b tai n  a cross-link ed, insolub l e r esin.U. S.P at. No . 4,0 78 , 993  describestheseparatio n of s u lfide o r  oxidiz ed sul fid e o res( e. g. , p yr i te, py rrh o tit e, or sp ha le rite)  fro m m e talmin eral  ores  (e.g., coppe r,zinc ,  le ad, n ickel ) us in g asa depr essan ta solution or d ispe rsion ofa l ow  mo le cular weight  co nde nsation  produc t  of  a n a ld ehyde with a compo un d co ntaining  2-6 a m in eo r amidegr oup s.
U . S . Pat . No s .4,128,47 5 and4 ,2 08 ,487 de sc ribe t he  se par ation of g anguematerial s fro m  mineral ore u s ing a convent i on a l  f r othi ngagent (e.g. , pi n e oi ls)c om bin e d wit h a ( pr e fe r ably alkylated) ami no -aldeh yde r esin that may  have free m e thylol g roup s .U .S. Pat. No. 4 ,139, 455 descri b es the s epara tion ofsulfide o r oxidized  su lfi deore s (e .g., pyrite,p y rrho ti te, orsph alerite ) f rom  me tal  m ineral or es (e.g. ,co pp er , z inc,l ead, nic ke l)us ing  as a depres santan a mi ne com pound ( e .g . ,  a p ol ya mine ) i nwhich  atl eas t 20% o f the tot aln umbe rof  aminegroups are te rt iary amine  g rou ps and i n whichthe number of quaternar y  aminegro ups i s fr om 0 to n otmore t han ⅓ thenumber  of t er tia r y  amin e gr oup s. 
U.S. Pat. N o.5,047 ,1 44 d escribe s the separation o f  si liceous mater ial s (e . g .,  fe l ds p ar)  f r omm i nerals (e.g., k aolinite)us i ng  as a depr e ssa nt  a cati on-acti ve co n densati on produc t of amin op last f orm ers with f ormaldeh yde, in c o mbina t io n wit h c ation- ac tiv e ten sides( e.g ., or ganical kylami nes)or  anion-a ctive tensides (e.g, lo ng-cha inedalk yl sulfon ate s ).Russian P aten t Nos. 427 ,73 7 a nd 27 6,8 4 5 des crib e  t he
atite) using_as a_depressant a phenol-formaldehyde copolymer_(e.g., a_resol,_a novolak)_or_a modified phenol_polymer (e.g., a_melamine-modified novolak).
U.S. Pat. No._3,990,965 describes the_separation_of iron oxide from bauxite using as a depressant a water soluble prepolymer of_low_chain length_that_adheres_selectively to gangue and that_can be further polymerized to_obtain a_cross-linked, insoluble resin.
U.S. Pat. No. 4,078,993 describes the_separation_of sulfide or_oxidized sulfide ores (e.g., pyrite, pyrrhotite, or sphalerite) from_metal mineral ores (e.g., copper, zinc,_lead, nickel) using_as_a_depressant a solution or_dispersion of a low molecular weight_condensation product of an aldehyde with_a compound containing 2-6 amine or amide_groups.
U.S. Pat. Nos. 4,128,475 and 4,208,487_describe the separation of gangue_materials from_mineral ore using a conventional_frothing agent (e.g.,_pine oils)_combined with a_(preferably alkylated) amino-aldehyde resin that may_have free methylol_groups.
U.S. Pat. No. 4,139,455 describes the_separation_of sulfide or_oxidized_sulfide_ores (e.g.,_pyrite, pyrrhotite, or_sphalerite)_from metal_mineral_ores (e.g., copper, zinc, lead, nickel)_using_as a depressant an amine compound (e.g.,_a polyamine) in which_at_least 20% of the_total number of amine groups_are tertiary amine groups and in_which the_number of_quaternary amine groups is from 0 to not more than ⅓_the number of tertiary amine groups.
U.S._Pat. No. 5,047,144 describes_the separation_of_siliceous materials (e.g.,_feldspar)_from minerals_(e.g., kaolinite) using as a depressant a_cation-active condensation_product of aminoplast formers with formaldehyde,_in combination with cation-active_tensides_(e.g., organic alkylamines) or anion-active tensides_(e.g, long-chained alkyl sulfonates).
Russian Patent Nos._427,737 and 276,845 describe the