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| Number | Title | Issue Date |
| 4699711 | Novel O,O'-, O,S'- or S,S'-dithiodialkylene-bis(mono- or dihydrocarbyl carbamothioates) and S,S'-dithiodialkylene-bis(mono- or dihydrocarbyl carbamodithioates) useful as froth flotation collectors 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 ... | 10/13/1987 |
| 4699712 | Ore dressing method 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, a... | 10/13/1987 |
| 4689142 | Alkyl mercaptans as collector additives in froth flotation 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 a... | 08/25/1987 |
| 4687571 | Process for the froth-flotation of a phosphate mineral from a phosphate-carbonate ore 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 minera... | 08/18/1987 |
| 4686033 | Trithiocarbonates as flotation reagents The efficiency of metals separation using ore flotation is improved by the use of certain substituted hydrocarbylene trithiocarbonates as suppressants for undesired metals.... | 08/11/1987 |
| 4684459 | Collector compositions for the froth flotation of mineral values A collector composition for use in froth flotation processes comprises two collectors. One of the collectors is preferably an omega-(hydrocarbylthio)alkylamine, S-(omega-aminoalkyl) hydrocarbyl thioate, N-(hydrocarbyl)-alpha, omega-alkanediamine, (omega-a... | 08/04/1987 |
| 4681700 | Partial oxidation of upgraded petroleum coke 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 cok... | 07/21/1987 |
| 4678563 | Modified alcohol frothers for froth flotation of sulfide ore Disclosed is a process for the concentration of sulfide ore wherein an aqueous slurry of sulfide ore particles are subjected to sulfide ore froth flotation under sulfide ore froth flotation conditions. The improvement in process comprises using an effecti... | 07/07/1987 |
| 4678561 | Promoters for froth flotation of coal 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 i... | 07/07/1987 |
| 4678562 | Promotors for froth floatation of coal 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 i... | 07/07/1987 |
| 4676890 | Collector compositions for the froth flotation of mineral values A collector composition useful for the recovery of metal values from metal ores in a froth flotation process comprises two collectors. One collector is an organic compound containing at least 4 carbon atoms and one or more monosulfide units, wherein the c... | 06/30/1987 |
| 4676804 | Coal cleaning by gaseous carbon dioxide conditioning and froth flotation A process for froth flotation of coal using gaseous carbon dioxide includes a preconditioning treatment of the coal with gaseous carbon dioxide followed by froth flotation, preferably also using gaseous carbon dioxide. The pretreatment causes the coal to ... | 06/30/1987 |
| 4673133 | Process for beneficiating oil shale using froth flotation and selective flocculation A process for beneficiating oil shale is disclosed including the steps of grinding the shale to fine particles in an aqueous medium, portions of which are kerogen-rich and kerogen-poor, scrubbing the particles, separating the particles by either selective... | 06/16/1987 |
| 4671801 | Method for the beneficiation, liquefaction and recovery of coal and other solid carbonaceous materials An integrated, continuous (or batch) process for the beneficiation and/or liquefaction of coal, especially low rank coals, is provided, the process generally involving admixing coal with an organic liquid medium under high shear agitation, further benefic... | 06/09/1987 |
| 4667885 | Process for grinding organic-containing minerals A process for grinding organic-containing mineral matter, particularly oil shale, is disclosed comprising a series of increasing finer grind-producing grinding steps, each followed by an organic beneficiation step. A portion of the organic-enhanced benefi... | 05/26/1987 |
| 4661278 | Monothiophosphinates as acid, neutral, or mildly alkaline circuit sulfide collectors and process for using same 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 ... | 04/28/1987 |
| 4657688 | Neutral hydrocarboxycarbonyl thionocarbamate sulfide collectors 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... | 04/14/1987 |
| 4650567 | Apparatus and method for flotation separation utilizing an improved spiral spray nozzle An improved method and apparatus for froth flotation separation of the components of a slurry, having particular utility for the beneficiation of coal by the flotation separation of coal particles from impurities associated therewith, such as ash and sulf... | 03/17/1987 |
| 4648966 | Process for beneficiation of dolomitic phosphate ores An improved phosphate ore beneficiation process wherein phosphate ore containing coarse, weathered dolomite in the flotation feed thereof is subjected to beneficiation as follows: The flotation feed is subjected to a rougher phosphate flotation step where... | 03/10/1987 |
| 4643823 | Recovering metal sulfides by flotation using mercaptoalcohols A process for recovering a metal sulfide mineral from ore by froth flotation using 1-alkyl substituted-2-mercaptoethanol as the flotation agent.... | 02/17/1987 |
| 4640789 | Ore flotation and flotation agents for use therein 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 me... | 02/03/1987 |
| 4637417 | Use of a submersible viscometer in the primary separation step of the hot water process for recovery of bitumen from tar sand The hot water process is controlled in response to viscosity measurements taken in situ in the middlings in the primary separation vessel. The viscosity in the middlings is found to vary. Therefore, the layer of maximum viscosity is located and the viscos... | 01/20/1987 |
| 4634580 | Process for the purification of wet-process phosphoric acid by removal of cadmium A process for the removal of cadmium contained in wet-process phosphoric acid by flotation by means of a cadmium-collector anionic surface active agent and an injected gas in the presence of other impurities including iron and possibly uranium which is ch... | 01/06/1987 |
| 4632750 | Process for coal beneficiation by froth flotation employing pretreated water A process for the beneficiation of coal by froth flotation comprising surface treating particulate coal with a polymerizable monomer, a polymerization catalyst and a liquid organic carrier thereby rendering said particulate coal hydrophobic and oleophilic... | 12/30/1986 |
| 4629556 | Purification of kaolin clay by froth flotation using hydroxamate collectors An improved flotation process for removal of colored titaniferous impurities from kaolin clay uses as collector a hydroxamate compound, or a mixture of compounds, having the formula ##STR1## in which R is an alkyl, aryl, or alkylaryl group having 4-2... | 12/16/1986 |
| 4622131 | Ore flotation In an ore flotation process for recovering copper values from an aqueous slurry the improvement comprises a depressant composition of an amino-substituted carboxylic acid derivative or a mercapto-substituted carboxylic acid derivative in combination with ... | 11/11/1986 |
| 4619760 | Ore flotation agent from 2-mercaptobenzimidazole and flotation processes therewith Process for the preparation of ore flotation collectors is disclosed comprising reacting an alkali metal salt of a 2-mercaptobenzimidazole with carbon disulfide. Also disclosed is process for recovery of minerals by flotation employing the novel ore flota... | 10/28/1986 |
| 4618416 | Thioamides, their preparation and uses The froth flotation of a metal sulfide mineral is carried out using a thioamide as the collector in which the thioamide is of the formula ##STR1## R designating C5 to C17 alkyls, R' being H or (CH2)n OR" an... | 10/21/1986 |
| 4618461 | O,O'-, O,S'- or S,S'-dithiodialkylene-bis(mono- or dihydrocarbyl carbamothioates) and S,S'-dithiodialkylene-bis(mono- or dihydrocarbyl carbamodithioates) and method of preparation thereof 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 ... | 10/21/1986 |
| 4615869 | Ore beneficiation process Phosphatic clay dispersions are modified by dispersing the phosphate matrix containing the clay in a dilute solution of selected acids prior to screening, sizing and other beneficiation operations.... | 10/07/1986 |
| 4612112 | Amidocarboxylic acids as flotation agents Amidocarboxylic acids containing a hydrophobic group on the nitrogen are used as flotation agents. They are particularly useful as collector agents in the separation of non-sulfide minerals from their gangues.... | 09/16/1986 |
| 4608154 | Process for the flotation of insol from sylvinite ore Insolubles are removed from sylvinite ores by froth flotation using a small amount of a primary, secondary or primary-ether alkyl amine as collector in combination with a flocculant. In the case of a primary alkyl amine, the collector may be the same as t... | 08/26/1986 |
| 4606817 | Recovery of molybdenite Directed to a flotation process for recovering molybdenite from a ground ore pulp containing the same which includes a rougher flotation step in which no collector is used by relatively high recovery of molybdenite in a rougher concentrate uncontaminated ... | 08/19/1986 |
| 4606818 | Modified alcohol frothers for froth flotation of coal 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 colle... | 08/19/1986 |
| 4605519 | O- and S-(2-mercaptoalkyl)- mono- or dihydrocarbyl carbamothioates and S-(2-mercaptoalkyl)mono- or dihydrocarbyl carbamodithioates The invention relates to novel O- or S-(2-mercaptoalkyl)mono- or dihydrocarbyl carbamothioates and S-(2-mercaptoalkyl)mono- or dihydrocarbyl carbamodithioate. The novel compounds of this invention are useful as collectors in the froth flotation of sulfide... | 08/12/1986 |
| 4605494 | Multistream, multiproduct, pressure manipulation beneficiation arrangement An improved method and apparatus for froth flotation separation of the components of a slurry, having particular utility for the beneficiation of coal by the flotation separation of coal particles from impurities associated therewith, such as ash and sulf... | 08/12/1986 |
| 4601818 | Ore flotation Mercaptobenzothiazoles are usually employed together with hydrocarbyl trithiocarbonate in flotation processes for the recovery of copper values from an ore containing same.... | 07/22/1986 |
| 4600505 | Single float step phosphate ore beneficiation A flotation process is taught for beneficiating phosphate ores containing, as impurities, silica and alkaline earth metal carbonates, particularly dolomite. Using a single flotation stage, the phosphate values are recovered in the overflow and quite unexp... | 07/15/1986 |
| 4597858 | Multistream, multiproduct beneficiation arrangement An improved method and apparatus for froth flotation separation of the components of a slurry, having particular utility for the beneficiation of coal by the flotation separation of coal particles from impurities associated therewith such as ash and sulfu... | 07/01/1986 |
| 4597857 | Process for producing an upgraded sulfide mineral concentrate from an ore containing sulfide mineral and silicate clay 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... | 07/01/1986 |
