Abstract: Disclosed is an improved froth flotation process wherein solid coal particles are selectively separated under coal froth flotation conditions as a froth phase from remaining solid feed particles as an aqueous phase in the presence of a coal particle collector (e.g. a fuel oil), optionally a promoter, and an alcohol frother. The improvement in the present invention is characterized by the alcohol frother comprising the reaction product of a C.sub.4 -C.sub.10 diol and a compound selected from the group consisting of an alkylene oxide and an acrylonitrile. The resulting frothing agent has at least one hydroxyl group and provides greater coal recovery than use of the diol as the frothing agent.

Abstract: Mercaptobenzothiazoles are usually employed together with hydrocarbyl trithiocarbonate in flotation processes for the recovery of copper values from an ore containing same.

Abstract: A process for separating metal sulfide minerals from an ore containing metal sulfide minerals and silicate clays by subjecting the finely divided ore to anionic flotation using an anionic collector to produce a metal sulfide mineral concentrate containing silicate clay, separating the anionic collector from the concentrate and subjecting the concentrate to cationic flotation to selectively float silicate and produce as a residual product a metal sulfide mineral concentrate containing reduced amounts of silicate clay.

Abstract: A process for the beneficiation of base metal sulfide mineral values from base metal sulfide ores with selective rejection of gangue sulfide minerals at pH values of below about 10.0 by froth flotation is disclosed. The process includes the use of a new and improved collector which at pH values below 10.0 exhibits unexpectedly high collector activity for base metal sulfide minerals such as copper, lead and zinc and selectively rejects gangue sulfide minerals, such as pyrite and pyrrhotite. The collector for base metal sulfide mineral values for use in the process comprises at least one hydrocarboxycarbonyl thionocarbamate compound having the formula: ##STR1## wherein R.sup.1 is C.sub.1 -C.sub.6 alkyl or phenyl and R.sup.2 is C.sub.1 -C.sub.8 alkyl. In a preferred embodiment of the present invention, the froth flotation is conducted under acid pH conditions by adjusting the pH of the flotation slurry with sulfuric acid.

Abstract: Mono- and dithioic esters, the alcohol residue of which carries a group including one or more oxygen atoms, are prepared by the action of an oxygen-containing organic compound, carrying an active atom, upon a mixed magnesium salt of a mono- or dithioic acid, ##STR1## where Y is O or S, R is a hydrocarbon group and X is a halogen. The product obtained is treated with an aqueous acid. The new products so synthesized are of the type ##STR2## notably those where R' is a chain, --(CH.sub.2).sub.n --, with n=1 to 12, Z being --OH or --COOH and are used as a collector in the flotation of minerals.

Abstract: Process of flotation of minerals, which consists of introducing the flotation collector into the mineral pulp to be treated in the form of a microemulsifiable composition. In general, the collector agents are organic compounds containing sulphur, particularly mercaptans, thioethers or polysulphides, which generally are very slightly soluble in water. This process is particularly suitable for minerals based on oxides and sulphides.

Abstract: Disclosed is an improved process wherein coal particles are beneficiated by froth flotation under coal froth flotation conditions to separate the desired coal particles from remaining unwanted ash and like gangue material. The improvement of the present invention comprises conducting the froth flotation in the presence of an effective proportion of a promoter which is at least C.sub.10 aliphatic carboxylic acid or an aliphatic ester thereof which is devoid of nitrogen atoms; the hydroxylated, oxidized, or alkoxylated derivative of said acid or ester promoters; and mixtures thereof.

Abstract: A process for the beneficiation of base metal sulfide mineral values from base metal sulfide ores with selective rejection of gangue sulfide minerals at pH values below about 10.0 by froth flotation is disclosed. The process includes the use of a new and improved collector which at pH values below about 10.0 exhibits unexpectedly high collector activity for base metal sulfide minerals of copper, nickel, molybdenum, cobalt and zinc and selectively rejects gangue sulfide minerals such as pyrite and pyrrhotite. The collector for base metal sulfide mineral values for use in the process comprises at least one diorganomonothiophosphinate compound having the formula: ##STR1## wherein R.sup.1 and R.sup.2 are each, independently, selected from saturated and unsaturated hydrocarbyl radicals, alkyl polyether radicals, and aromatic radicals, and such radicals, optionally and independently, substituted with polar groups selected from halogen, nitrile and nitro groups; or wherein R.sup.1 and R.sup.

Abstract: A process for the recovery of mineral values from carbonaceous ores is disclosed wherein the collector comprises a hydrocarbon acid or acidester having a molecular weight of at least about 500, an oil, and optionally, a sulfonated hydrocarbon compound.

Abstract: An ore dressing method for recovering metal values by froth flotation and from their ores, in which flotation of the ore is conducted in the presence of a frothing agent mixture comprising a minor amount of a phosphorodithioic compound as a synergistic adjuvant and a frother which may be an aliphatic alcohol or ketone; a terpenic oil or alcohol or phenol; or a polyalkylene or polyoxyalkylene glycol or ether.

Abstract: Metal trithiocarbonates such as Na.sub.2 CS.sub.3 are useful depressant for such sulfided minerals as copper and iron sulfides in molybdenum recovery.

Abstract: New and improved collector compositions for use in froth flotation processes for the beneficiation of mineral values from base metal sulfide ores are disclosed. The collector compositions comprise at least one hydrocarboxycarbonyl thionocarbamate compound selected from compounds of the formula: ##STR1## wherein R.sup.1 and R.sup.2 are each, independently, selected from saturated and unsaturated hydrocarbyl radicals, alkyl polyether radicals and aromatic radicals, or such radicals optionally substituted by polar groups selected from halogen, nitrile and nitro groups. The use of the hydrocarboxycarbonyl thionocarbamate collectors provides excellent metallurgical recoveries of sulfide mineral values in froth flotation processes conducted over a broad range of pH conditions including acid, neutral and mildly alkaline pH.

Abstract: The invention is a process for recovering coal or mineral values from raw coal or mineral ore which comprises subjecting the raw coal or mineral ore in the form of an aqueous pulp, to a floatation process in the presence of a floatation collector, and a flotating amount of a floatation frother which comprises the reaction product of an alitphatic C.sub.6 alcohol and between about 1 and 5 moles of propylene oxide, butylene oxide or mixtures thereof, under conditions such that the coal or mineral values are recovered.

Abstract: A composition and process are provided for the recovery of the values of zinc, molybdenum, copper, lead, iron (pyrite), and iron-containing small amounts of gold or uranium, or both, from ores comprising these mineral sulfides. The aqueous composition is the impure form of an alkali metal alkyl trithiocarbonate compound. The process comprises employing said aqueous composition as a collection agent for the above minerals in an ore recovery process.A process for the separation of zinc values from lead values from a ore comprising both is provided by employing an alkali metal alkyl trithiocarbonate compound as a collection agent for zinc.In addition, both a composition and process are provided for the recovery of the values of iron, copper, and lead from ores comprising these values. The composition consists essentially of a dispersant and an impure form of an alkali metal alkyl trithiocarbonate compound.

Abstract: Dimercaptodihydroxy alkanes are used as a curing agent for epoxide resins and as ore flotation agents.

Abstract: A dry differential flotation reagent for molybdenum-bearing ore is disclosed comprising from about 1 to about 30 percent by weight of NaSH, 0 to 20 percent by weight of NaOH, 60 to 90 percent by weight of a mixture of sodium thiophosphates comprising, as major components thereof, Na.sub.3 PS.sub.4, Na.sub.3 PS.sub.3 O, Na.sub.3 PS.sub.2 O.sub.2, and Na.sub.3 PO.sub.3 S, with Na.sub.3 PS.sub.4 further comprising from about 15 mole percent to about 70 mole percent of phosphate mixture. The flotation reagent can be prepared by reacting P.sub.4 S.sub.10 with NaOH and NaSH in a molar ratio of about 1:16. When added to a flotation vessel containing molybdenum concentrate, the flotation reagent promotes suppression of lead and copper sulfides, even without the addition of sodium cyanide, to permit the improved recovery of molybdenum with a lower level of impurities.

Abstract: A phosphate ore flotation process comprising subjecting a phosphate ore containing surface-activated silica and silicates to froth flotation in the presence of a fatty-acid collector, recovering the phosphate concentrate from the overflow; removing the fatty acid collector from the phosphate concentrate in the presence of a sulfuric acid deoiling agent; subjecting the phosphate concentrate to a reversed froth flotation in the presence of a silica collector and a modifier, said silica collector being an amine and said modifier being either alkyl diphosphonic acid, or being HF; removing the separated silica from the overflow; and recovering the phosphate product in the underflow. The process of the present invention not only overcomes the problems of activated silica flotation, but also results in greatly improved grade and/or recovery of phosphate product in comparison to present conventional phosphate ore flotation processing.

Abstract: S-Carboalkoxy-S'-alkyl trithiocarbonate, S-carboalkenoxy-S'-alkyl trithiocarbonate, S-carboalkenoxy-S'-alkenyl trithiocarbonate and S-carboalkoxy-S'-alkenyl trithiocarbonate, their use as flotation agents, and a process to make these novel compositions are disclosed.

Abstract: The efficiency of metals separation using ore flotation is improved by the use of certain substituted hydrocarbylene trithiocarbonates as suppressants for undesired metals.

Abstract: New and improved collector compositions for use in froth flotation processes for the beneficiation of mineral values from base metal sulfide ores are disclosed. The collector compositions comprise at least one hydrocarboxycarbonyl thiourea compound selected from compounds of the formula: ##STR1## wherein R.sup.1 is hydrogen or R.sup.2 ; R.sup.2 is selected from saturated and unsaturated hydrocarbyl radicals, hydrocarboxy radicals and aromatic radicals; and R.sup.3 is selected from saturated and unsaturated hydrocarbyl radicals, alkyl polyether radicals and aromatic radicals, said R.sup.2 and R.sup.3 radicals, optionally, and independently, being substituted by polar groups selected from halogen, nitrile and nitro groups. The use of the hydrocarboxycarbonyl thiourea collectors provides excellent metallurgical recoveries of sulfide mineral values in froth flotation processes conducted over a very broad range of pH including acid, neutral and mildly alkaline pH.

Abstract: A process for the beneficiation of copper sulfide mineral values from base metal sulfide ores with selective rejection of pyrite and/or pyrrhotite or other gangue minerals at pH values of below about 10.0 by froth flotation is disclosed. The process includes the use of a new and improved collector which at pH values below 10.0 exhibits unexpectedly high collector activity for copper sulfide minerals and selectively rejects pyrite and other gangue sulfides or non-sulfides. The collector for copper mineral values for use in the process comprises at least one hydrocarboxycarbonyl thiourea compound having the formula: ##STR1## wherein R.sup.1 is hydrogen or R.sup.2 ; R.sup.2 is C.sub.1 -C.sub.8 alkyl and R.sup.3 is C.sub.1 -C.sub.6 alkyl or phenyl. In a preferred embodiment of the present invention, froth flotation is conducted under acid pH conditions by adjusting the pH of the flotation slurry with sulfuric acid.

Abstract: A composition and process are provided for the recovery of the values of zinc, molybdenum, copper, lead, iron (pyrite), and iron-containing small amounts of gold or uranium, or both, from ores comprising these mineral sulfides. The aqueous composition is the impure form of an alkali metal alkyl trithiocarbonate compound. The process comprises employing said aqueous composition as a collection agent for the above minerals in an ore recovery process.A process for the separation of zinc values from lead values from an ore comprising both is provided by employing an alkali metal alkyl trithiocarbonate compound as a collection agent for zinc.In addition, both a composition and process are provided for the recovery of the values of iron, copper, and lead from ores comprising these values. The composition consists essentially of a dispersant and an impure form of an alkali metal alkyl trithiocarbonate compound.

Abstract: Carboxyalkyl dithiocarbamates which can be characterized by the formula ##STR1## wherein R is selected from the group consisting of alkylene radicals, wherein R' is selected from the group consisting of hydrogen and methyl and ethyl radicals, and wherein X is selected from the group consisting of alkali metal atoms, their use as ore flotation suppressants, and a process for making these novel compositions are disclosed.

Abstract: A process for froth flotation of phosphate ore with a high content of carbonate, carried out in the presence of a hydrophilic polysaccharide and an amphoteric compound.

Abstract: Dimercaptodihydroxy alkanes, such as 1,10-dimercapto-2,9-dihydroxydecane, are used as a curing agent for epoxide resins and as ore flotation agents.

Abstract: Sodium diethyl dithiophosphate and sodium ethyl trithiocarbonate are used for the flotation of molybdenum and/or copper containing ores.S-allyl-S'-n-butyl trithiocarbonate and N,N-dimethyl-S-benzyl dithiocarbamate are used for the flotation of molybdenum and/or copper containing ores.Sodium isopropyl xanthate and sodium n-butyl trithiocarbonate are used for the flotation of lead.

Abstract: Mercapto polycarboxylic acids, especially the trithiocarbonate derivatives thereof and alkali metal salts, are employed as treating agents in mineral recovery operations.

Abstract: Diammonium bis(carboxyalkyl)-trithiocarbonate salts, dialkali metal bis(carboxyalkyl)-trithiocarbonate salts, their use as flotation agents, and a process for the production of these novel compositions are disclosed.

Abstract: A froth flotation process for the beneficiation of fine coal is disclosed which employs as a collector a water-dispersible polyorganosiloxane or a mixture of water-dispersible polyorganosiloxanes which contain either aryl radicals or aryl radicals combined with polyethylene oxide and polypropylene oxide radicals. Preferred polyorganosiloxanes are those which contain both aryl radicals and polyethylene oxide and/or polypropylene oxide radicals. The process of this invention is espeically useful for the beneficiation of difficult-to-float fine coals.

Abstract: A process for the recovery of mineral values by froth flotation in an aqueous medium employing a novel frother. Frothers prepared by Michael addition between alpha, beta-unsaturated ethylenic compounds and either alcohols, amines or mercaptans or by the condensation of HCN, aldehydes/ketones with either alcohols, amines or mercaptans have been found to be effective in the froth flotation system and capable of reducing the required collector consumption.

Abstract: The method of recovering copper from a copper-bearing ore which comprises froth flotation of the ore in alkaline circuit and in the presence of a phosphorodithio compound of the formula ##STR1## wherein X is hydrogen, alkali metal, or the ammonium radical and R is alkyl-substituted phenyl of from 6 to 14 carbon atoms having from 1 to 3 alkyl substituents and from 1 to 6 carbon atoms in each alkyl substituent. Sodium O,O-bis(isopropylphenyl) phosphorodithioate and O,O-bis(isopropylphenyl) phosphorodithoic acid are illustrative. The method is particularly useful with sulfide minerals, especially with copper sulfides and molybdenum sulfides.

Abstract: Capryl alcohol is employed as a frother in the froth flotation of silica from iron ore.

Abstract: Minerals, especially coals for power generation, can be subjected to froth flotation using as a collector a liquid which contains at least 21% aromatics or at least 41% naphthenes. Improvements in froth yield and ash-in-tailings compared with commercial products are demonstrated.

Abstract: Process of flotation of minerals, which consists of introducing the flotation collector into the mineral pulp to be treated in the form of a microemulsifiable composition. In general, the collector agents are organic compounds containing sulphur, particularly mercaptans, thioethers or polysulphides, which generally are very slightly soluble in water. This process is particularly suitable for minerals based on oxides and sulphides.

Abstract: A froth flotation process for the beneficiation of fine coal is disclosed which employs as a collector a water-dispersible polyorganosiloxane or a mixture of water-dispersible polyorganosiloxanes which contain organic radicals selected from the group consisting of polyethylene oxide and polypropylene oxide radicals. The process of this invention is especially useful for the beneficiation of difficult-to-float fine coals.

Abstract: This invention is a froth flotation process for beneficiating finely sized mineral matter from a finely sized mineral ore pulp comprising floating the finely sized mineral ore pulp in a frothing aqueous medium comprising a collector and a carrier particle in an effective amount for beneficiating the finely sized mineral matter by flotation, wherein the carrier particles are adapted for selectively floating the finely sized mineral matter. The carrier particles of this invention should have a particle size and a density which are suitable for selectively beneficiating the finely sized mineral ore particles by froth flotation and have a surface treated with a condensation product, or acid derivative of a condensation product, of an alkanolamine with a fatty acid, a fatty acid ester, a dibasic fatty acid or a tribasic fatty acid, in a sufficient amount to render the carrier particle sufficiently hydrophobic to float in the frothing aqueous medium.

Abstract: S-allyl-S'-n-butyl trithiocarbonate and N,N-dimethyl-S-benzyl dithiocarbamate are used for the flotation of molybdenum and/or copper containing ores.Sodium isopropyl xanthate and sodium n-butyl trithiocarbonate are used for the flotation of lead.

Abstract: Process for the preparation of an organic dithio-acid by reaction of the corresponding dithio-ester and an alkali metal or alkaline earth metal hydrosulphide in a solvent in the presence of an excess of H.sub.2 S and treatment with a mineral acid. The dithioic acids so obtained can be utilized as collectors for the flotation of minerals.

Abstract: Aliphatic complex phosphate esters or salts thereof, of a non-ionic surface active compound, are utilized together with aliphatic fatty acids as collector agents during flotation for removing titanium-based impurities from kaolin clays in a froth flotation process.

Abstract: S-carbalkoxy-S'-alkyl trithiocarbonate and n-dodecyl mercaptan are used for flotation of copper, nickel and iron-containing ores. S-carbalkoxy-S'-alkyl trithiocarbonate, n-dodecyl mercaptan and poly(propylene glycol) are used for the flotation of copper, nickel and iron-containing ores. Other ores are disclosed as being suitable for the flotation thereof with these novel compositions.

Abstract: Ammonium dialkylaminoalkyl (thiocarbonyldithio) alkanoates, alkali metal dialkylaminoalkyl (thiocarbonyldithio) alkanoates, their use as flotation agents, and a process for the production of these novel compositions are disclosed. N,N-dialkylaminoalkyl mercaptoalkanoate, its use as an intermediate in the production of the novel ammonium dialkylaminoalkyl (thiocarbonyldithio) alkanoates and alkali metal dialkylaminoalkyl (thiocarbonyldithio) alkanoates, and a process for the production of this novel composition are also disclosed.

Abstract: Ammonium N-carboxyalkyl-S-carboalkoxy dithiocarbamates, alkali metal N-carboxyalkyl-S-carboalkoxy dithiocarbamates, their use as flotation agents, and a process for the production of these novel compositions are disclosed.

Abstract: A flotation collector composition comprises a combination of fatty acids, amidocarboxylic acids or amidosulfonic acids and partial esters of phosphoric acid and alkoxylated alcohols. The collector composition is used for upgrading nonsulfide minerals containing alkaline earth metals by froth flotation. Minerals such as apatite, calcite, scheelite, fluorspar, magnesite and baryte can be separated from the gangues using the collector composition.

Abstract: Phosphate ore is concentrated by flotation in the presence of a half-ester of an organic dicarboxylic acid, such as maleic acid, with a saturated aliphatic alcohol containing at least 11 carbon atoms. Water and oil also are present. The half-ester may be partly neutralized, e.g. with caustic soda, in an amount at most sufficient to raise the pH to 7.0.

Abstract: A composition comprising a mixture containing both the following compounds in substantial quantities(a) S-allyl-S'-n-butyl trithiocarbonate; and(b) a compound selected from the group consisting of N,N,S-triethyl dithiocarbamate, N,N-diethyl-S-n-butyl dithiocarbamate, and mixtures thereof, is used for the flotation of molybdenum, copper, nickel, zinc and iron-containing ores.

Abstract: The invention is a process of concentrating sulfide ores, which comprises subjecting a sulfide ore, in the form of a pulp, to a flotation process in the presence of a flotation collector for the sulfides comprising a 1,3-oxathiolane-2-thione or a 1,3-dithiolane-2-thione.

Abstract: Metal trithiocarbonates such as Na.sub.2 CS.sub.3 are useful depressant for such sulfided minerals as copper and iron sulfides in molybdenum recovery.

Abstract: A collector for use in concentrating metal values in ores by flotation, said collector comprising a mixture of (A) an O-alkyl N-alkylthionocarbamate wherein each alkyl radicals has from 1 to 6 carbon atoms and (B) at least 30 percent by weight of (A) of a normally liquid tall oil fatty acid fraction.

Abstract: Disclosed is an improved process wherein coal particles are beneficiated by froth flotation under coal froth flotation conditions to separate the desired coal particles from remaining unwanted ash and like gangue material. The improvement of the present invention comprises conducting the froth flotation in the presence of an ester-alcohol frothing agent. The preferred ester-alcohol frothing agents are reaction products of C.sub.1 -C.sub.10 mono-basic carboxylic acids and diols wherein the total number of carbon atoms range from about 6-19 and monocarboxylic acid esters of polyoxyalkylene glycols which can contain up to 25-30 carbon atoms.

Abstract: S-Allyl-S'-n-butyl-trithiocarbonate and S-benzyl-S'-n-butyltrithiocarbonate, their use and flotation agents and a process to make these novel compositions are disclosed.