Abstract: A mineral beneficiating reagent containing an alkyl hydroxamic acid or salt thereof and a nonionic surfactant. The alkyl hydroxamic acid or a salt thereof is represented by the formula: R—C(?O)N(R?)—OM, wherein R is linear or branched C2-C18 alkyl, linear or branched C2-C18 alkenyl, C6-C20 aryl or substituted aryl, C7-C26 aralkyl or substituted aralkyl; R? is H, C1-C12 alkyl or aralkyl; M is hydrogen, an alkali metal, or an ammonium cation represented by N+(A,B,C,D) wherein each of A,B,C,D, respectively, are H or C1-C6 alkyl or benzyl radicals. The nonionic surfactant can be any known nonionic surfactant, including but not limited ethoxylated alcohols, esters, ethoxylated acids, ethoxylated (alkyl) phenols, alcanolamides, polyethylene oxide copolymers and mixtures thereof.

Abstract: A mineral beneficiating reagent containing an alkyl hydroxamic acid or salt thereof and a nonionic surfactant. The alkyl hydroxamic acid or a salt thereof is represented by the formula: R—C(?O)N(R?)—OM, wherein R is linear or branched C2-C18 alkyl, linear or branched C2-C18 alkenyl, C6-C20 aryl or substituted aryl, C7-C26 aralkyl or substituted aralkyl; R? is H, C1-C12 alkyl or aralkyl; M is hydrogen, an alkali metal, or an ammonium cation represented by N+(A,B,C,D) wherein each of A,B,C,D, respectively, are H or C1-C6 alkyl or benzyl radicals. The nonionic surfactant can be any known nonionic surfactant, including but not limited ethoxylated alcohols, esters, ethoxylated acids, ethoxylated (alkyl) phenols, alcanolamides, polyethylene oxide copolymers and mixtures thereof.

Abstract: The present invention process and compositions remove heavy metal ions, such as cadmium, copper, lead, nickel, arsenic, manganese and mercury ions from wet-process phosphoric acid by providing a simple, single-step process that uses relatively small amounts of reagent. The process involves treating either the crude acid prior to gypsum filtration or the filtered acid with an organic precipitating agent composition, precipitating metals such as copper, cadmium, nickel, mercury, zinc, and separating the precipitate by either filtration or flotation, to produce phosphoric acid with reduced levels of the metals. The compositions of the present invention include a diorgano dithiophosphinic acid (or alkali metal or ammonia salts thereof), a first dithiophosphoric acid (or alkali metal or ammonia salts thereof) with alkyl or alkylaryl or aralkyl moieties, and optionally a second diaryl dithiophosphoric acid (or alkali metal or ammonia salts thereof).

Abstract: A process for the flocculation of impurities from clays in which the following steps are performed: blunging the clay with a dispersing agent or combination of dispersing agents in water to form an aqueous dispersion, treating the aqueous dispersion with at least one aliphatic or aromatic hydroxamic acid or salt conditioning agent, flocculating the conditioned dispersion with a water soluble or water dispersible organic polymer containing hydroxamic acid groups or salts thereof, and removing the flocculated impurities to form a purified clay dispersion.

Abstract: An improved process for the selective flocculation of impurities from clays is disclosed. The process comprises blunging the clay in the presence of dispersing agents, conditioning the blunged clay with aliphatic or aromatic hydroxamic acids, or salts thereof, flocculating the impurities with a high molecular weight polymeric flocculant, particularly polymers containing hydroxamate groups, and removing the flocculated impurities from the unflocculated clay. The use of hydroxamic conditioning agents improves the removal of impurities from the clay, thereby providing a clay product having high brightness and low level impurities. The hydroxamic acid conditioning agents may advantageously be used in combination with other conditioning additives and with a wide variety of polymeric flocculating agents.

Abstract: Novel depressants for depressing sulfide minerals during froth floatation of ores to recover value minerals are disclosed, as well as a method for their use in the froth flotation. The novel depressants are terpolymers of a (meth)acrylamide, an allyl thiourea and a hydroxyalkyl (meth)acrylate.

Abstract: A method for the depression of non-sulfide, silicate gangue minerals is provided wherein the depressant is a polymeric mixture of a polysaccharide and a material comprising recurring units of the formula: ##STR1## wherein X is the polymerization residue of an acrylamide or mixture of acrylamides, Y is an hydroxy group containing polymer unit, Z is an anionic group containing polymer unit, x represents a residual mole fraction of at least about 35%, y represents a residual mole fraction of from about 1 to 50% and z represents a residual mole fraction of from about 0 to about 50%.

Abstract: A method for the depression of non-sulfide, silicate gangue minerals is provided wherein the depressant is a polymeric material comprising recurring units of the formula: ##STR1## wherein X is the polymerization residue of an acrylamide or mixture of acrylamides, Y is an hydroxy group containing polymer unit, Z is an anionic group containing polymer unit, x represents a residual mole fraction of at least about 35%, y represents a residual mole fraction of from about 1 to 50% and z represents a residual mole fraction of from about 0 to about 50%.

Abstract: A method for the production of alkyl or alkaryl hydroxamic acids and/or salts wherein a C.sub.8 -C.sub.22 alcohol is employed with water as the solvent is disclosed as well as the resultant salt and/or acid solutions per se and their use in the flotation of non-sulfide minerals, preferably clay.

Abstract: Collector compositions for use in froth flotation processes for the benefication of precious metals i.e. gold, silver and platinum group metals (PGM) from sulfide ores containing especially pyrrite and pyrrhotite are disclosed. The collector comprises alkyl hydroxamic acids or their alkali metal or ammonium salts, preferably in combination with standard sulfide ore collectors such as xanthates etc.

Abstract: Various acrylic acid allyl/thiourea polymers and their use as depressants in the beneficiation of sulfide minerals from ores are disclosed.

Abstract: Various acrylic acid allyl/thiourea polymers and their use as depressants in the beneficiation of sulfide minerals from ores are disclosed.

Abstract: Various acrylic acid allyl/thiourea polymers and their use as depressants in the beneficiation of sulfide minerals from ores are disclosed.

Abstract: Various acrylamide/allyl thiourea polymers and their use as depressants in the beneficiation of sulfide minerals from ores are disclosed.

Abstract: A method for the production of alkyl or alkaryl hydroxamic acids and/or salts wherein a C.sub.8 -C.sub.22 alcohol is employed with water as the solvent is disclosed as well as the resultant salt and/or acid solutions per se and their use in the flotation of non-sulfide minerals, preferably clay.

Abstract: Various acrylamide/allyl thiourea polymers and their use as depressants in the beneficiation of sulfide minerals from ores are disclosed.

Abstract: An improved method of separating non-sulfide value minerals from non-sulfide ores is disclosed. The improved method includes the step of adding a depressant selective for siliceous gangue minerals and materials to a flotation slurry previously conditioned with an anionic collector. In preferred embodiments, the depressants comprise copolymers or terpolymers derived from acrylamide units and N-acrylamidoglycolic acid units. The method provides generally improved recoveries of non-sulfide value minerals at higher grade, in a reduced number of flotation steps and at reduced consumption levels of flotation reagents.

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 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: 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.