Abstract: The froth flotation of coal is conducted in the presence of an epoxide conditioner.

Abstract: Alkyl sulfosuccinates based on propoxylated and propoxylated and ethoxylated fatty alcohols as flotation collectors for non-sulfidic ores and to a process for the separation of non-sulfidic ores by flotation in which the alkyl sulfosuccinates used contain one or two identical or different, straight-chain and/or branched-chain, saturated or unsaturated alkyl radicals based on propoxylated or propoxylated and ethoxylated C.sub.8 -C.sub.22 fatty alcohols.

Abstract: A process for automating fine coal cleaning including monitoring the operation of a flotation cell for separating coal from ash impurities by automatically detecting the coal content of the tailings from the cell and controlling the supply of additives to the cell to optimize slurry coal recovery and automatically monitoring the fluid level of the coal slurry in a dewatering filter tub to control the supply of additives to the filter tub and functioning of a dewatering filter.

Abstract: At present the usual method of recycling of drilling muds by the exclusive application of classifying processes during drilling rig operation leads to the disposal of fine grained barite containing waste materials. In this invention, a simple one-stage flotation process using alkylphosphate based collecting and foaming reagents is applied to recover the barite content of such muds thus producing a marketable barite concentrate. The flotation should preferably be carried out at pH 8 to 9 with CaO, Ca(OH).sub.2 or KOH as regulating reagents and with the optimal solids content in the flotation pulp (preferably 100 g/l). The solids content in the flotation pulp can easily be adjusted by diluting with process water.

Abstract: A heavy medium low-specific gravity method for recovering coarse clean coal within a size range of about +28 m and fine clean coal and coal-bearing particles within a size range of -28 x Om from a raw coal feed wherein heavy medium is recovered as a substantially clean product which can be recycled in the heavy medium system. In the method a raw coal feed containing coal, shale and other impurities within a size range of about 3.81 cm.times.0 is mixed withi a heavy medium to produce a slurry of low specific gravity between about 1.27 and 1.70. The slurry is treated in at least one cyclone to separate an overflow product containing substantially all coal and coal-bearing particles from an underflow product containing all shale and sulfur-bearing rejects.The overflow product is treated on standard equipment to separate coarse coal from fine coal and heavy medium. The coarse coal is recovered as a usable product.

Abstract: Minerals are recovered from ore by subjecting the ore, in the form of an aqueous pulp, to a froth flotation process in the presence of a collector of the formula:R.sup.1 --X--(R).sub.n --N--(R.sup.2).sub.2 (Ia)orR.sup.1 --X--(R).sub.n --N=Y (Ib)wherein --(R).sub.n -- is ##STR1## each R' is independently hydrogen, methyl or ethyl; y+p+m=n; n is an integer from 1 to 6; y and m are independently 0 or 1 and y+m=0 or 1 and p is an integer from 1 to 6 and each moiety can occur in random sequence; R.sup.1 is a C.sub.1-22 hydrocarbyl or a C.sub.1-22 substituted hydrocarbyl and each R.sup.2 is independently hydrogen, a C.sub.1-22 hydrocarbyl or a C.sub.1-22 substituted hydrocarbyl; --X-- is --N(R.sup.3)-- or ##STR2## R.sup.3 is H or a C.sub.1-22 hydrocarbyl or a C.sub.1-22 substituted hydrocarbyl; =Y is =S, =O, a hydrocarbylene or a substituted hydrocarbylene radical.

Abstract: This invention relates to a method of recovering non-ferrous metal sulfides from a metal ore which comprises subjecting the metal ore, in the form of an aqueous pulp, to a froth flotation process in the presence of a flotating amount of a flotation collector wherein the collector comprises a compound which corresponds to one of the formulas ##STR1## wherein R.sup.1 is alkyl, aryl or aralkyl group wherein the aryl and aralkyl can be substituted with a halo or alkyl moiety;R.sup.2 is alkyl, aryl or aralkyl group wherein the aryl or aralkyl can be substituted with a halo or alkyl moiety;R.sup.3 is aryl or aralkyl unsubstituted or substituted with a halo or alkyl moiety;R.sup.4 is alkyl, aryl or aralkyl group wherein the aryl or aralkyl can be substituted with a halo or alkyl moiety; with the proviso that at least one of R.sup.1 and R.sup.2 must be aryl or aralkyl unsubstituted or substituted;under conditions such that the metal sulfide values are recovered in the froth.

Abstract: Use of N-alkyl and/or N-alkenyl aspartic acids or salts thereof as co-collectors in the flotation of non-sulfidic ores and a process for the separation of non-sulfidic ores by flotation wherein N-alkyl and/or N-alkenyl aspartic acids or salts thereof are used in collector mixtures.

Abstract: Mixtures of(a) at least one alkyl or alkenyl polyethylene glycol ether which is terminally blocked by a hydrophobic radical, and(b) at least one anion-active surfactant are used as collectors in the flotation of non-sulfide ores.

Abstract: A process for separating non-sulfidic minerals from an ore by flotation in which the ore is contacted with a mixture of(a) at least one adduct of ethylene oxide and propylene oxide with a C.sub.8 -C.sub.22 fatty alcohol and(b) at least one anionic, cationic or ampholytic surfactant.

Abstract: Minerals are recovered from ore by subjecting the ore, in the form of an aqueous pulp, to a froth flotation process in the presence of a collector of the formula:R.sup.1 --X--(R).sub.n --N--(R.sup.2).sub.2 or (Ia)R.sup.1 --X--(R).sub.n --N.dbd.Y (Ib)wherein (--R--).sub.n is ##STR1## each R' and R" is independently hydrogen, methyl or ethyl; y+p+m=n; n is an integer from 1 to 6; y and m are independently 0 or 1 and y+m=0 or 1 and p is an integer from 1 to 6 and each moiety can occur in random sequence; R.sup.1 is a C.sub.1-22 hydrocarbyl or a C.sub.1-22 substituted hydrocarbyl; each R.sup.2 is independently hydrogen, a C.sub.1-22 hydrocarbyl or a C.sub.1-22 substituted hydrocarbyl; --X-- is --S-- or ##STR2## and .dbd.Y is .dbd.S, .dbd.O, a hydrocarbylene or a substituted hydrocarbylene radical.

Abstract: The invention relates to a method of separating phosphatic minerals from phosphate ores, especially from phosphate carbonate ores by flotation in the presence of a collector, which comprises a compound having the general formulaX.sub.1 --(CH.sub.2).sub.1 --Y--(CH.sub.2).sub.m --X.sub.2 Ior its salt, in which formulal and m are mutually independently 0 or 1,Y is --S--, --SO-- or --OSO--,X.sub.1 and X.sub.2 are mutually independently --R or --CR(R'Z.sub.1)Z.sub.2, Z.sub.1 and Z.sub.2 are mutually independently --H, --OR, --COOR, --OCOR, --NR'COR, --CONR'R, --COSR, --CSOR, --COR or --SO.sub.3 H or Z.sub.1 and Z.sub.

Abstract: A process is described for the mineral separation of rare earth metal compounds, such as bastnaesite, contained in oxidic minerals. The process is a froth flotation process utilizing a novel collector emulsion, which is an emulsified mixture of:a secondary amine modified sulphonated fatty acid,a high rosin containing tall oil fatty acid,an anionic petroleum sulphonate, anda high molecular weight primary amine.The collector emulsion mixture is added to the aqueous slurry of the comminuted rare earth metal compound containing oxidic mineral, which has been previously conditioned in a conventional manner. The conditioning reagents may include alkaline pH modifiers and gangue depressants such as citric acid, oxalic acid, sodium silicates and fatty acids.The rare earth metal compounds will be concentrated in the froth, and are separated in the conventional manner.

Abstract: The froth flotation of coal is conducted in the presence of a conditioner of an oxygen containing compound of the formula:R.sub.1 --O--R.sub.2).sub.n (I)wherein R.sub.1 and each R.sub.2 are independently saturated hydrocarbyls and n is from 1 to about 3.

Abstract: Disclosed is a process for deashing coal, which comprises the following steps (a) to (e):(a) crushing coal to form crushed coal having a particle size distribution of 0.05 to 15 mm and an average particle size of 0.5 to 2 mm,(b) producing an aqueous slurry comprising the crushed coal, 1 to 4 wt.

Abstract: The invention is a process for recovering coal from raw coal which comprises subjecting the raw coal in the form of an aqueous pulp, to a flotation process in the presence of a flotation collector, and a flotating amount of a flotation frother which comprises the reaction product of a polyhydroxy C.sub.1-20 alkane or polyhydroxy C.sub.3-20 cycloalkane and propylene oxide, or a mixture of propylene oxide and ethylene oxide, with the proviso that at least 50 mole percent of the mixture is propylene oxide, and the reaction product has a molecular weight of between about 150 and 1400, under conditions such that the coal is recovered.

Abstract: In a method of agglomerating carbonaceous coal comprising first agglomerating impurity liberated carbonaceous coal, from an impurity liberated coal slurry, with agglomerating oil to form open structured, chain-like, micro-agglomerates and then forming relatively larger, less open structured more robust agglomerates from a portion of the slurry to provide a mixture of micro-agglomerates, relatively larger, more robust agglomerates, water and any inorganic impurities that may be present. The relatively larger, more robust agglomerates are screened and then the micro-agglomerates are separated using an aerating, skimmer tank leaving an inorganic impurity laden waste water. The micro-agglomerates are rendered buoyant by the aeration and are thus rendered separable from the inorganic laden waste water which may be further treated to remove the inorganic waste to provide water for recirculation.

Abstract: The present invention provides a blended preparation for the separation especially of coal particles from the tailings which are contained in the fines produced in coal mining. The blended preparation is used instead of or in addition to the conventional froth oil. The blended preparation comprises froth oil, flocculating agent, emulsifying agent, water and optionally, anti-freeze. The use of the preparation results in faster separation and saving in flocculating agent.

Abstract: The invention relates to a process for the separation of phosphate minerals from a phosphate ore, especially from a phosphate-carbonate ore, by using in the flotation as the reagent selective for phosphate mineral a compound having the general formula I, or a salt or amide ##STR1## of the same, in which formula X is --CH--CH--, ##STR2## Y is ##STR3## n is a number 0-40, in which case, when n is greater than 1, groups ##STR4## may be the same or different, m is 0 or 1, B is --NRR.sup.2 or, when m and n are 0, ##STR5## R is H, R.sup.3 or ##STR6## and R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5, which may be the same or different, each stand for an aromatic, araliphatic or straight-chain or branched aliphatic hydrocarbon which contains 1-30 carbon atoms and which is possibly substituted by an oxygen or nitrogen function, with the exception of sulfosuccinic acid monolkyl amide according to Formula I. The invention also relates to such a reagent.

Abstract: Tri-alkali metal di(carboxyalkyl) dithiocarbamates and triammonium-di(carboxyalkyl) dithiocarbamates which can be characterized by the formula ##STR1## wherein R and R' can be the same or different and are selected from the group consisting of alkylene radicals, preferably alkylene radicals each preferably having from 1 to 12 carbon atoms, and wherein M is selected from the group consisting of alkali metal atoms and ammonium; their use as ore flotation depressants; and a process for making these novel compositions are disclosed.

Abstract: A beneficiation reagent is provided which is the half-ester reaction product of a short-chain dicarboxylic acid source, such as maleic anhydride, and a saturated, aliphatic, monohydric alcohol containing from eight to thirteen carbon atoms, preferably ten carbon atoms. This reagent is added neat to a water-slurry of iron ore concentrate in an amount of from about 0.1 to about 0.7 pounds/ton.

Abstract: Process for the selective separation of kaolinite and feldspar by flotation in aqueous pulp, wherein flotation is carried out at the pH-value of the pulp which is naturally obtained during suspension of the mixture of minerals in water using water-soluble salts with trivalent metal ions as activators and depressors, in the presence of cationic and/or anionic surfactants as collectors, and optionally in the presence of other standard flotation aids.

Abstract: A process for recovering phosphate values from silica-containing phosphate ores is provided. The ore has a particle size in the range of about 0.6 to 1.2 mm and is subjected to selective flotation in the presence of a cationic flotation reagent comprising a di(hydrophobic group) quaternary ammonium salt, wherein each of the hydrophobic groups contain 6 or more carbon atoms and at least one of the groups contains from about 10-20 carbon atoms, in combination with a hydrocarbon oil and a phosphate depressing agent.

Abstract: This invention relates to a froth flotation process for selectively recovering metal-containing sulfide or sulfidized metal-containing oxide minerals from ores using a froth flotation process. The collector employed in the process is an organic monosulfide of the formula:R.sub.1 --S--R.sub.2wherein R.sub.1 is a methyl, ethyl, epoxy (i.e., ##STR1## group or R.sub.3 --S--R.sub.4 wherein R.sub.3 is a hydrocarbyl or substituted hydrocarbyl group and R.sub.4 is a hydrocarbylene or substituted hydrocarbylene; and R.sub.2 is an alkyl or cycloalkyl group having from 5 to 11 carbon atoms.

Abstract: A process and reagents are described for separating beryllium silicate concentrates by flotation from oxidic minerals. The process is especially suitable for the separation of phenacite and bertrandite present in ores with complex gangue compositions. The ore is ground and subjected to acid pretreatment, then conditioned by the addition of pH modifier, alkali fluoride activator and a depressant containing sodium hexametaphosphate and carboxymethyl cellulose, or hexametaphosphate and quebracho. The conditioned ore is thereafter treated with a tall oil fatty acid-based collector mixture, of general formula C.sub.17 H.sub.31-35 COOH; which also contains cresylic acid, kerosene and a branched short-chained aliphatic alcohol, such as methyl-iso-butyl carbinol. Mercapto acetic acid and alkali metal hydrogen sulphide may also be added in the second and third stages of conditioning, respectively, for increasing selectivity. The mineral concentration process includes conventional rougher and cleaner flotation steps.

Abstract: This invention relates to a froth flotation process for selectively recovering nonferrous metal-containing sulfide minerals or sulfidized metal-containing oxide minerals from ores using froth flotation. The collector employed in the process is an epithio compound of the formula: ##STR1## wherein m=1, 2 or 3; each R is independently hydrogen, a hydrocarbyl group or substituted hydrocarbyl group; each R.sup.1 is independently hydrogen, a hydrocarbyl group or substituted hydrocarbyl group, provided one R or R.sup.1 is not hydrogen; and each R.sup.2 is independently hydrogen, hydrocarbyl, hydrocarbyloxy or hydrocarbyl thioether.

Abstract: A process and composition are provided for the froth flotation beneficiation of iron minerals from iron ores containing silicate and phosphate minerals, comprising as collectors a combination of a primary amine and a nitrogen compound containing an anionic group selected from methylene carboxylic acid, ethylene phosphoric acid and methylene phosphonic acid.

Abstract: The froth flotation of coal is conducted in the presence of a conditioner of the condensate of naphthenic acid and an alkanolamine such as diethanolamine.

Abstract: A process for recovering phosphate values from a finely divided ore containing the phosphate values and gangue such as an ore containing apatite, calcite and dolomite, by froth flotation includes the steps of suspending the finely divided ore containing the phosphate values and the gangue in a liquid at a pH of greater than 7; adding to the suspension a froth flotation collector comprising a tall oil fatty acid and an emulsifier for the tall oil fatty acid selected from alkylphenylalkoxylates having the formula: ##STR1## wherein: n is an integer from 8-10 inclusive;m is an integer from 10-20 inclusive; andalkyl is --CH.sub.2 --CH.sub.2 -- or ##STR2## the froth flotation collector comprising 80-99% by weight of the collector of the tall oil fatty acid and 20 to 1% by weight of the collector of the emulsifier; introducing a gas such as air into the liquid to produce a froth containing the phosphate values and leaving suspended the other solid gangue; and recovering the phosphate values.

Abstract: A method and apparatus for monitoring the operation of a froth flotation process comprises sensing variations in solids content of the input stream to the process, varying the dosage of flotation reagent employed in accordance with the input variations, sensing variations in solids content of at least one of the output streams after a predetermined time lapse, comparing the input and output readings with control data relating input and output solids content, and re-adjusting the dosage of flotation reagent dependent on the difference between the actual readings and the control data.

Abstract: An on-stream method and apparatus for measuring the content of a mineral constituent in a flowing slurried ore on a dry weight basis, is provided. The slurry density and flow rate, and optionally temperature, are measured to calculate a period of time during which the flowing slurry is diverted into a vessel in order to collect a target mass of ore solids therein. The time period is preferably calculated according to the following formula: ##EQU1## wherein: t is the period of time (sec);M.sub.solid is the selected target mass of the ore (g);Q.sub.slurry is the measured mass flow rate of the slurry (g/sec);p.sub.water is the density of water (g/cm.sup.3);p.sub.slurry is the measured density of the slurry (g/cm.sup.3); andp.sub.solid is the known density of the ore solids contained in the slurry (g/cm.sup.3).The slurry flow is then diverted into the vessel for the duration of the calculated time period.

Abstract: A new froth flotation collecting agent and an improved flotation process for beneficiating silica-containing ores, particularly phosphate ores, are provided. In the process, silica particles are selectively separated, by froth flotation, as a froth phase from mineral particles, particularly phosphate particles, remaining in an aqueous concentrate phase in the presence of a silica-activating ion and a mixed collecting agent containing an anionic collector and a cationic collector.

Abstract: Organic ionic collecting agents for the selective flotation of lead and zinc ores, said agents having the following general formula: ##STR1## wherein the symbols have the following meanings: R represents an alkoxyl group having from 3 to 12 carbon atoms;R.sub.1 represents H, a linear or branched chain alkyl group, an alkoxyl or hydroxyalkyl group containing up to 12 carbon atoms;X represents H, Cl, Br, I, F, CN, CONH.sub.2, NO.sub.2, SO.sub.2 NH.sub.2 ;M represents H, Na, K, Li, Cs.

Abstract: Process for the selective separation of kaolinite and feldspar by flotation in aqueous pulp, wherein flotation is carried out at the pH-value of the pulp which is naturally obtained during suspension of the mixture of minerals in water using water-soluble salts with trivalent metal ions as activators and depressors, in the presence of cationic and/or anionic surfactants as collectors, and optionally in the presence of other standard flotation aids.

Abstract: An improved method for the froth flotation recovery and/or grade of vermiculite from vermiculite containing rock and clay. It uses a composition comprising oil and between 2-60% by weight of an alkyl phenol formaldehyde condensation product.

Abstract: Gold values are obtained from gold cyanidation tailings or gold bearing ores by treating the same with a flotation collector consisting of 5 to 20% xanthate collector and 80 to 95% fatty acid collector of a pulp pH range from 5 to 8.

Abstract: An aqueous dispersion of unreacted particulate petroleum coke substantially comprising carbon and containing a small amount of ash substantially comprising vanadium constituents and other materials from a process for the partial oxidation of petroleum coke to produce synthesis gas is mixed with a hydrocarbon alkoxy sulfate and a frothing agent. After pH adjustment, if necessary, the mixture is subjected to aeration with or without mechanical agitation in a froth flotation zone. About 5 to 25 wt. % of the unconverted particulate petroleum coke (basis carbon) particles float in the froth layer that is formed. The remainder of the unconverted petroleum coke comprising coarser particles is suspended in a bottom aqueous dispersion on which the froth layer floats. In addition, selective separation of the vanadium constituents in the unconverted petroleum coke ash takes place. The vanadium content of the ash in the floated portion of unconverted petroleum coke is unexpectedly increased about 10 to 50 weight percent.

Abstract: The invention relates to adducts of phosphinic acid with maleic acid semiesters and salts thereof corresponding to the following general formula ##STR1## in which R.sup.1 is hydrogen or a methyl group,R.sup.2 is a linear or branched, optionally hydroxyl substituted C.sub.8 -C.sub.18 alkyl or cycloalkyl group or an aryl group corresponding to the formula ##STR2## in which R.sup.3 and R.sup.4 may be the same or different and are hydrogen or a linear or branched unsubstituted C.sub.7 -C.sub.12 alkyl group,M is H, Na, K or NH.sub.4,m is an integer of from 1 to 8, andn is 1 or 2.The invention also relates to a process for production of the adducts and to their use for the flotation of non-sulfidic minerals.

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, R.sup.2 is selected from the group consisting of alkylene radicals and wherein M is selected from the group consisting of ammonium and alkali metal atoms, their use as ore flotation depressants, and a process for making these novel compositions are disclosed.

Abstract: This invention relates to a novel composition which is useful as a collector for the recovery of nonferrous metal-containing sulfide minerals and sulfidized metal-containing oxide minerals from ores in a froth flotation process. The novel composition comprises (a) an organic compound containing one or more monosulfide units wherein the sulfur atom(s) are bound to aliphatic or cycloaliphatic carbon atoms, and the total carbon content of the compound is such that the compound has sufficient hydrophobic character to cause metal-containing sulfide mineral or sulfidized metal-containing oxide mineral particles to be driven to an air/bubble interface; and (b) an alkyl thiocarbonate, a thionacarbamate, a thiophosphate, or mixtures thereof.

Abstract: A coal conditioner is set forth in this disclosure. The coal, crushed and sized, is separated more readily on addition of a conditioner prior to flotation separation. The conditioner features fatty esters of alkanolamine hydroxyalkylates having an ether linkage.

Abstract: An ore dressing method for beneficiating copper from copper bearing ore by froth flotation employing the collector which comprises a mixture of an O,O-bis(alkylphenyl) phosphorodithioic compound, e.g., sodium O,O-bis(isopropylphenyl) phosphorodithioate, and a thiono compound which is an alkyl xanthogen formate, e.g., isobutyl xanthogen alkyl ethyl formate, and/or a thionocarbamate, e.g., N-ethyl O-isopropyl dialkyl thionocarbamate.

Abstract: The invention relates to novel O,O'-, O,S'- or S,S'-dithiodialkylene-bis(mono- or dihydrocarbyl carbamothioates) and S,S'-dithiodialkylene-bis(mono- or dihydrocarbyl carbamodithioate). The novel compounds of this invention are useful as collectors in the froth flotation of sulfide mineral ores.

Abstract: A method and product for concentrating metal values from their ores employing alkyl mercaptans as collector additives in froth flotation, wherein there is provided a mixture of (I) a collector selected from the class consisting of at least one of (A) an alkyl xanthogen alkyl formate compound having the general formula: ##STR1## wherein R is a branched or straight chain alkyl substituent having 1 to 6 carbon atoms and R' is selected from the class consisting of one of ethyl and methyl; and (B) a dialkyl thionocarbamate compound having the formula: ##STR2## wherein Y is a branched or straight chain alkyl substituent having 1 to 6 carbon atoms and Y' is selected from the class consisting of one of ethyl and ethyl; and (II) an alkyl mercaptan having the formula:Z--SHwherein Z is a branched or straight chain alkyl substituent having 4 to 16 carbon atoms. Isobutyl xanthogen ethyl formate, N-methyl-O-ethyl thionocarbamate and dodecyl mercaptan are illustrative.

Abstract: A process for the separation of phosphate minerals from a phosphate-carbonate ore, by flotation, wherein a phenol polymer such as a resol or a novolak, which improves the yield and selectivity of the phosphate minerals with respect to the carbonate minerals, is used in addition to a collector agent in the flotation.

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: An improved spray apparatus for the froth flotation of a liquid-solid slurry, e.g., water-containing coal particulate, is disclosed. The initially high velocity of a spray of the slurry prior to its contacting the surface of liquid in a froth flotation cell is significantly reduced through a double deflection arrangement associated with the spray nozzle. This reduction in the velocity of the spray results in a more efficient froth flotation process.

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: 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 separation of phosphate minerals from a phosphate-carbonate ore, by flotation, wherein a phenol polymer such as a resol or a novolak, which improves the yield and selectivity of the phosphate minerals with respect to the carbonate minerals, is used in addition to a collector agent in the flotation.