Preferential Patents (Class 209/167)
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Patent number: 4575419Abstract: 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.Type: GrantFiled: January 7, 1985Date of Patent: March 11, 1986Assignee: Occidental Chemical CorporationInventors: John A. Peterson, Mohan S. Saran, Joseph S. Wisnouskas
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Patent number: 4568454Abstract: The amount of carbonate mineral impurities is reduced in aqueous phosphate rock slurry by (a) conditioning the slurry with an effective amount of CO.sub.2, (b) adding an effective amount of an anionic collector to the slurry and (c) subjecting the slurry to a froth flotation process whereby the carbonate mineral impurities are concentrated in the froth. The CO.sub.2 acts to depress flotation of phosphate minerals relative to the carbonate mineral impurities.Type: GrantFiled: August 20, 1984Date of Patent: February 4, 1986Assignee: International Minerals & Chemical Corp.Inventors: Vikram P. Mehrotra, Kallidaikurichi N. Sivaramakrishnan
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Patent number: 4565625Abstract: 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.Type: GrantFiled: December 10, 1984Date of Patent: January 21, 1986Assignee: Tennessee Valley AuthorityInventors: Shuang-shii Hsieh, James R. Lehr
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Patent number: 4554137Abstract: Process of enrichment of minerals by flotation by means of a collector comprising a thio-compound, the thio-compound being a straight or branched dialkyl or dialkenyl polysulphide.Type: GrantFiled: October 13, 1983Date of Patent: November 19, 1985Assignee: Societe Nationale Elf Aquitaine (Production)Inventors: Jacques Maurice, Patrice Guesnet, Pierre Tozzolino, Guy Muller
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Patent number: 4554068Abstract: 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.Type: GrantFiled: December 13, 1984Date of Patent: November 19, 1985Assignee: Phillips Petroleum CompanyInventors: Kenneth B. Kimble, Harold W. Mark, Clarence R. Bresson
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Patent number: 4549959Abstract: A process for selectively separating molybdenum from a molybdenite-containing copper sulfide concentrate by a flotation process wherein the molybdenite is selectively floated by the use of a sulfite or bisulfite compound as a copper sulfide depressant.Type: GrantFiled: October 1, 1984Date of Patent: October 29, 1985Assignee: Atlantic Richfield CompanyInventors: Raynor O. Armstrong, Daniel A. Norrgran, William A. Yuill
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Patent number: 4548673Abstract: A method and apparatus for deinking a fibre stock or slurry. In order to optimize the separation process the invention proposes to independently control the air injection phase, the mixing phase, and the separation phase by splitting them into separate steps.Thus, there is provided a separation cell which is fed with slurry from an inlet. Air is introduced into the slurry before entry into the separation cell and before entering a mixing section which mixes the air and slurry before entering the separation cell. The air is introduced under pressure by way of a porous sintered sleeve, while the mixing is achieved by the provision of three turbulence discs in the preferred embodiment. Alternative turbulent generating means may be employed.The mixing ensures contact of the ink with the air bubbles which separate out in the separation cell and rise to the surface as a foam. The foam is removed by suction, while the deinked fibre slurry is drawn off from the tank by means of a weir or stand pipe.Type: GrantFiled: April 16, 1984Date of Patent: October 22, 1985Assignee: Beloit CorporationInventors: Ashok K. Nanda, Luigi Silveri, Michael A. McCool
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Patent number: 4545898Abstract: 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.Type: GrantFiled: May 23, 1984Date of Patent: October 8, 1985Assignee: Berol Kemi ABInventor: Karl M. E. Hellsten
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Patent number: 4533466Abstract: Mercapto polycarboxylic acids, especially the trithiocarbonate derivatives thereof and alkali metal salts, are employed as treating agents in mineral recovery operations.Type: GrantFiled: October 31, 1984Date of Patent: August 6, 1985Assignee: Phillips Petroleum CompanyInventors: Clarence R. Bresson, Benjamin R. Robles, Robert M. Parlman
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Patent number: 4533467Abstract: 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.Type: GrantFiled: May 10, 1984Date of Patent: August 6, 1985Assignee: Phillips Petroleum CompanyInventors: Kenneth B. Kimble, Clarence R. Bresson, Harold W. Mark
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Patent number: 4533465Abstract: Low molecular weight copolymers of the general formula: ##STR1## exhibit excellent concentrative action in the flotation of sylvinite ores thereby resulting in improved selectivity and recovery of sylvite (KCl). The low molecular weight copolymers perform concentrative action without resulting in any associated flocculation in the flotation process.Type: GrantFiled: July 16, 1984Date of Patent: August 6, 1985Assignee: American Cyanamid CompanyInventors: Richard M. Goodman, Sim K. Lim
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Patent number: 4528107Abstract: 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.Type: GrantFiled: July 27, 1983Date of Patent: July 9, 1985Assignee: Coal Industry (Patents) LimitedInventors: David J. A. McCaffrey, John P. Sheppard
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Patent number: 4515687Abstract: 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.Type: GrantFiled: May 10, 1984Date of Patent: May 7, 1985Inventors: Clarence R. Bresson, Rector P. Louthan
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Patent number: 4515688Abstract: The present invention comprises a process for the separation of ore components by flotation comprising: grinding ore to form pulp, mixing said pulp with sulfide ions and cyanide ions, adjusting the concentration of said sulfide ions to a level at least sufficient to cause depression of base metal mixed sulfides but insufficient to cause substantial activation of pyrites, and adjusting the concentration of said cyanide ions to a level at least sufficient to cause auxiliary depression of the mineral components of said ore which are required to be depressed in said flotation, but insufficient to cause overdepression of said mineral components; said sulfide ions and cyanide ions having been introduced to said pulp at predetermined times and in a predetermined sequence.Type: GrantFiled: March 18, 1983Date of Patent: May 7, 1985Assignee: South American Placers, Inc.Inventor: Alfredo P. Vargas
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Patent number: 4514292Abstract: The froth flotation of ore and coal is significantly improved in recovery and grade of valuable minerals and coal when a depressant combination of an inorganic sulfite and the salts of certain sulfonated compounds are employed.Type: GrantFiled: November 9, 1983Date of Patent: April 30, 1985Assignee: Hercules IncorporatedInventor: Charles L. Burdick
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Patent number: 4514293Abstract: 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.Type: GrantFiled: May 10, 1984Date of Patent: April 30, 1985Inventors: Clarence R. Bresson, Harold W. Mark
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Patent number: 4511464Abstract: 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.Type: GrantFiled: July 22, 1983Date of Patent: April 16, 1985Assignee: The Dow Chemical CompanyInventor: Roger W. Bergman
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Patent number: 4510050Abstract: 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.Type: GrantFiled: October 26, 1982Date of Patent: April 9, 1985Inventors: Robert M. Parlman, Clarence R. Bresson, Tommy L. Young
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Patent number: 4504092Abstract: In a treatment of carnallitic ores by treatment with a decomposition-brine containing amounts of MgCl.sub.2, KCl and NaCl suitable for precipitating artificial sylvinite in a solution of MgCl.sub.2 saturated in KCl and NaCl, the improvement of adding to said decomposition-brine a collector, e.g., a fatty amine acetate, for the flotation of KCl and a source of gas, preferably a gas-liberating additive such as H.sub.2 O.sub.2, so as to contact newly formed crystal nucleii of KCl selectively with said collector and to contact bubbles of said gas with said collector so as to form a froth enriched in KCl simultaneously with the decomposition of said carnallite, the process being particularly useful for treatment of underground carnallitic ore whereby the froth and brine are withdrawn at the surface, separated, and the brine, after make-up additions, is recycled to the ore formation.Type: GrantFiled: March 5, 1982Date of Patent: March 12, 1985Assignee: Mines de Potasse d'Alsace S.A.Inventors: Michel Bichara, Jean-Pierre Koensgen, Michel Bodu, Michel Meriaux, Jean-Pierre Zimmermann
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Patent number: 4488959Abstract: A process for separating scheelite from gange wherein the ore is ground with 0.4 to 10 grams of alkali metal carbonate per kg. of ore, forming a pulp and removing sulfide minerals from pulp liquor. Carrying out froth floatation in the presence of paraffin oil, 0.1-0.4 gram of fatty acid per kg. of ore and 3.2-5.5 grams of sodium silicate per kg. of ore wherein the weight ratio of paraffin oil to fatty acid is 0.5:1 to 2.8:1.Type: GrantFiled: September 13, 1982Date of Patent: December 18, 1984Inventor: Gordon E. Agar
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Patent number: 4486301Abstract: A phosphate ore flotation process subjecting a phosphate ore containing carbonate mineral impurities to froth flotation in the presence of modifying agents, said modifying agents being alkyl phosphonic acids and hydrofluoric acid, and a collector, said collector being fatty acids; collecting the phosphate and carbonate minerals as rougher concentrate from the overflow; subjecting the phosphate and carbonate mineral concentrate to a differential desorption with an acid to remove the fatty acid from the surface of the phosphate mineral; removing the separated carbonate minerals from the overflow; and recovering the phosphate values in the underflow.Type: GrantFiled: January 16, 1984Date of Patent: December 4, 1984Assignee: Tennessee Valley AuthorityInventors: Shuang-shii Hsieh, James R. Lehr
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Patent number: 4482454Abstract: The present invention relates to a process for treating a cassiterite ore, characterized in that, just before the flotation operation, said ore is subjected to a preliminary flotation operation, using an amphoteric collector of formula: ##STR1## in which: R is R.sub.1 or R.sub.1 --O-- or ##STR2## R' is H, CH.sub.3, polyoxyalkyl or R(CH.sub.2).sub.3 or A.sub.q --Z, R" is H or A.sub.q --ZAp and A.sub.q are polymethylene chains,Z is selected from the carboxylic, sulfonic or phosphonic groups.Type: GrantFiled: November 9, 1982Date of Patent: November 13, 1984Assignee: Ceca S.A.Inventors: Jacques DeCuyper, Edwin Broekaert, Joris Van't Hoff
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Patent number: 4477338Abstract: A method is proposed for processing high-ash coal sludges by flotation of a slurry in the cells of flotation units, particularly for processing gas coal and open burning coal which are difficult to float, in which the coal slurry to be processed flows through the cells of the flotation unit pre-conditioned and controllably, particularly with control of the dwell time. In a preferred embodiment, the control of the dwell time occurs by a controlled distribution of the slurry to cells of the flotation unit which operate in parallel. For the purpose of controlling the dwell time of the slurry in a flotation unit, cells which are traversed in parallel are additionally connected or disconnected as a function of operating parameters, such as slurry density or solids content or solids distribution.Type: GrantFiled: March 9, 1982Date of Patent: October 16, 1984Assignee: Ruhrkohle AktiengesellschaftInventor: Karl Hellmann
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Patent number: 4472271Abstract: A non-diluting flotation apparatus and process is disclosed which includes a single cell, or a series of multiple cells. Each cell comprises a non-agitated, flotation vessel having a submerged inlet in its upper portion for feeding a previously treated or conditioned clay or ore suspension in water. The suspension flows downward in the vessel to an outlet from which a combined product and recycle stream is taken. Thereafter, a recycle stream is separated and air bubbles are entrained into the recycle stream which is returned to the lower portion of the cell. In the cell the entrained air rises as very small bubbles, flushing certain mineral impurities removed from the clay with the air. The air and impurities form a froth atop the liquid surface and the froth is mechanically removed.Type: GrantFiled: August 25, 1982Date of Patent: September 18, 1984Assignee: Freeport Kaolin CompanyInventor: Franklin C. Bacon, Jr.
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Patent number: 4472270Abstract: The invention provides a new and improved process for beneficiating ores which comprises a single cationic float using an etherdiamine as the cationic collector following washing the feed with aqueous alkali metal silicate.Type: GrantFiled: May 18, 1983Date of Patent: September 18, 1984Assignee: Mobil Oil CorporationInventors: Anil K. Agrawal, Ross A. Kremer, George J. Weckesser
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Patent number: 4461701Abstract: A process for rutile flotation from rutile ores associated with iron containing components, in which process an alcoholic solution is employed of N-benzoyl-N-phenylhydroxylamine as a flotation collector of rutile. This process is especially suitable for rutile separation by flotation from rutile-hematite ores, with the use of said selective collector at pH values between 1 and 2.5.Type: GrantFiled: February 14, 1983Date of Patent: July 24, 1984Assignee: Consiglio Nazionale delle RichercheInventors: Giorgio Rinelli, Anna M. Marabini
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Patent number: 4460459Abstract: A sequential flotation process for the recovery of high-grade concentrates of copper, lead and cobalt-nickel from sulfide ores is provided. A primary grind ore pulp is conditioned with SO.sub.2 as H.sub.2 SO.sub.3 under intense aeration, and the conditioned pulp subjected to sequential flotation, with regrinding and conditioning of a copper rougher concentrate obtained in the first flotation step for copper.Type: GrantFiled: February 16, 1983Date of Patent: July 17, 1984Assignee: Anschutz Mining CorporationInventors: Douglas R. Shaw, John F. Spisak, Jerome P. Downey, Gary E. Butts
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Patent number: 4460460Abstract: Beneficiation of ores, especially phosphate ores, is improved by using deionized or softened water in the conditioning step.Type: GrantFiled: April 13, 1982Date of Patent: July 17, 1984Assignee: Mobil Oil CorporationInventors: Frank Cariello, Ross A. Kremer
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Patent number: 4455223Abstract: An improved method in concentration of oxide ores by froth flotation process which comprises subjecting a sufficiently fine sized ore of a metal which can change the valency state from lower to higher by the action of inorganic oxidizing compounds in the presence of an effective amount of a polyhydroxy fatty acid collector-frother; the indicated compounds provide selectivity and/or recovery of oxide minerals of iron, chromium, cerium, antimony, arsenic, titanium, zirconium, thorium, vanadium, niobium, tantalum, and wolfram, over silica and silicate gangue.Type: GrantFiled: September 9, 1982Date of Patent: June 19, 1984Inventor: Vojislav Petrovich
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Patent number: 4450070Abstract: Froth flotation of oxidized coal in the presence of certain imidazoline or imidazolinium salts improves both the selectivity and recovery attained. Imidazolines found particularly efficacious are those bearing a fatty alkyl group in the 2- position and an N-aminoethyl or N-hydroxyethyl group. Preferred imidazolinium salts are those corresponding to the following formula: ##STR1## wherein R is a C.sub.6 to C.sub.22 alkyl or alkenyl group.Type: GrantFiled: November 13, 1981Date of Patent: May 22, 1984Assignee: The Dow Chemical CompanyInventor: Robert E. Hefner, Jr.
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Patent number: 4441993Abstract: A process for recovering metallic values by putting the values into solution and separating undesired mineral matter from the solution using countercurrent flotation is provided. The process involves leaching metallic values from host rock, conditioning the resultant ore pulp with the required reagents to achieve selective flotation of mineral matter in the metallic values solution, introducing the conditioned ore pulp into flotation cells, along with counterflow of solution from an immediately subsequent flotation step, wherein simultaneous washing and flotation is achieved, and the mineral matter is removed leaving a solution of the metallic values. The resultant mineral matter froth product is subjected to subsequent stages of flotation and simultaneous washing with counterflow of solution removed from each subsequent stage of flotation, water and/or barren solution being used for washing in the final flotation stage.Type: GrantFiled: May 3, 1979Date of Patent: April 10, 1984Assignee: Fluor CorporationInventor: Frank P. Howald
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Patent number: 4440636Abstract: A method is disclosed for improving the recovery of a conventional single or double stage flotation process for the benefication of phosphate ore. The method includes treating the discarded froth product of the conventional phosphate proces with waste slime from the flotation process. The slime and froth product is agitated to completely deactive the cationic reagent prior to the anionic treatment with new phosphate ore in a conventional flotation process.Type: GrantFiled: February 11, 1982Date of Patent: April 3, 1984Assignee: J. Warren AllenInventor: George M. Lilley
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Patent number: 4439314Abstract: A blend of certain xanthates with mercaptan/glycol combinations produce collector compositions which yield improved results in ore flotation.Type: GrantFiled: August 9, 1982Date of Patent: March 27, 1984Assignee: Phillips Petroleum CompanyInventors: Robert M. Parlman, Clarence R. Bresson
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Patent number: 4437982Abstract: A method of separating fine coal particles from refuse particles comprising the step of:(a) providing a coal filter cake(b) forming a slurry of fine coal particles, refuse particles in a liquid mixture comprising water and organic liquid,(c) contacting said coal filter cake with said slurry,whereby a major portion of said water and a major portion of said refuse pass through said filter cake and a major portion of said organic liquid and a major portion of said fine coal particles pass across the top of said filter cake.Type: GrantFiled: August 9, 1982Date of Patent: March 20, 1984Assignee: Conoco Inc.Inventor: George E. Wasson
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Patent number: 4436616Abstract: This invention provides a process for the beneficiation of phosphate ores having a magnesia-rich carbonate-containing gangue and a silica-containing gangue, which process comprises subjecting the phosphate ore particles to controlled attrition to remove at least a portion of the magnesia-rich carbonate-containing gangue; and subjecting the phosphate ore resulting from attrition to a plurality of flotations to remove the remaining magnesia-rich carbonate-containing gangue and the silica-containing gangue and to recover a concentrated phosphate product, the flotations including sequentially a phosphate flotation, a silica flotation and a carbonate flotation. Alternatively, the controlled attrition can be employed after the silica flotation and prior to the carbonate flotation.Type: GrantFiled: March 30, 1982Date of Patent: March 13, 1984Inventors: Philippe Dufour, Jean-Jacques Predali, Guy Ranchin, deceased, by Marc Ranchin, legal heir, by Genevieve Ranchin, legal heir
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Patent number: 4426282Abstract: Flotation of fly ash to recover coal contained therein is carried out in at least two steps, pH of the flotation slurry in the first step being 6-8, and in the last step lower than in the first step and below 6.5, preferably in the range of 3-5. The temperature may be ambient but is preferably 30.degree.-60.degree. C. As collector and frother several of those commonly employed are usable, preferably gas oil and pine oil, respectively. Desired pH is preferably achieved by sulphuric acid if desired in part by acidic flue gases. There is obtained separation into an almost carbon-free ash fraction and a carbonaceous fraction of low ash content.Type: GrantFiled: February 11, 1982Date of Patent: January 17, 1984Assignee: Kryolitselskabet Oresund A/SInventor: Knud E. H. Aunsholt
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Patent number: 4425230Abstract: Dithiocarbonic acid, trithiocarbonic acid, water soluble salts of dithiocarbonic acid or trithiocarbonic acid or mixtures thereof when contacted with a mixed sulfide ore effectively depresses copper and iron sulfides thereby permitting molybdenite to be recovered by froth flotation. In copper concentrates produced by a flotation process, the organic collector reagents adhering to the surface of the copper and iron sulfides may be, and preferably are, stripped by conventional physical or chemical means prior to contacting the copper concentrate with the trithiocarbonate depressants of the invention. However, the trithiocarbonates of the invention have been found to be effective depressants of copper and iron sulfides in concentrates which are not stripped prior to treatment with the depressant.Type: GrantFiled: February 16, 1982Date of Patent: January 10, 1984Assignee: Oreprep Chemicals, Inc.Inventors: Carlos Andress, William F. Riggs
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Patent number: 4425229Abstract: Process for treating by reverse flotation phosphate ores of the carbonate or silico-carbonate gangue type. It includes the steps of:(1) conditioning of the ore in a manner known per se with a product acting to depress the phosphate compounds,(2) treatment of the conditioned ore step (1) with a collector essentially comprising a phosphoric ester,(3) flotation of the carbonates, this leading to a flotation residue which contains the phosphate compounds and, if so required, in the case where the starting compound is of the silico-carbonate gangue type,(4) conditioning of said flotation residue by a cationic collector, the possibly present silicates being thus separated by flotation.The process permits benification of the phosphate ores by a treatment wholly carried out in sea-water.Type: GrantFiled: September 8, 1981Date of Patent: January 10, 1984Assignee: Bureau de Recherches Geologiques et MinieresInventors: Michel Baron, Gerard Baudet, Amar Henchiri, Pierre-Luc Hergibo
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Patent number: 4424122Abstract: A composition comprising a mercaptan, an imidazoline and a frother has been found to synergistically increase gold recovery over the recovery achievable with mercaptan and imidazoline alone.Type: GrantFiled: April 19, 1982Date of Patent: January 3, 1984Assignee: Phillips Petroleum CompanyInventors: Robert M. Parlman, Clarence R. Bresson
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Patent number: 4421641Abstract: The present invention relates to an enrichment process, by flotation, of sedimentary ores containing phosphate, and comprising a gangue of the carbonated type and in some cases a gangue of the siliceous type, wherein an amphoteric product of formula ##STR1## is at least used as collecting agent, in which formula: R is of form R.sub.1 or R.sub.1 O--, R.sub.1 being a saturated or unsaturated alkyl radical, either linear or branched, and comprising between 5 and 19 carbon atoms.R' and R" are H or --Aq--Z, bearing in mind that for R", when n is greater than 1, there can be in the molecule simultaneously radicals H and radicals --Aq--Z.Ap and Aq are polymethylene chains containing between 1 and 4 carbon atoms,n is a number equal to O or an integer between 1 and 5,Z is a radical selected from the carboxylic, the sulphonic and the phosphonic radicals, and in obtaining the flotation of the carbonated gangue by a reverse flotation in "basic medium .Type: GrantFiled: December 31, 1981Date of Patent: December 20, 1983Assignee: Ceca S.A.Inventors: Pierre Blazy, Robert Houot, Robert Joussemet, Philippe Haicour, Jean Tracez
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Patent number: 4416770Abstract: Recovery of copper and iron from ores is enhanced by adding beta-mercaptoethanol as a depressant to a froth flotation process. Flotation of sulfides of zinc and lead is reduced.Type: GrantFiled: May 28, 1982Date of Patent: November 22, 1983Assignee: Phillips Petroleum CompanyInventors: Clarence R. Bresson, Robert M. Parlman
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Patent number: 4416769Abstract: This invention relates to froth flotation of coal.According to the invention a predominantly paraffinic residual oil having a cut point of at least 190.degree. C. at atmospheric pressure is used as a "collector" for the froth flotation of minerals. A preferred oil is a coal spray oil used in coke oven technology. The "collector" is for use with a "frother" such as a polyglycol ether.Type: GrantFiled: December 24, 1981Date of Patent: November 22, 1983Assignee: Coal Industry (Patents) LimitedInventors: David J. A. McCaffrey, William D. Jones, deceased
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Patent number: 4414107Abstract: A process for the recovery of molybdenum and copper values from an ore comprising the same is provided which comprises employing an oxazine compound as a collection agent.Type: GrantFiled: June 29, 1982Date of Patent: November 8, 1983Assignee: Phillips Petroleum CompanyInventors: Robert M. Parlman, Richard C. Doss
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Patent number: 4394257Abstract: 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 alcoholics, amines or mercaptans have been found to be effective in the froth flotation system and capable of reducing the required collector consumption.Type: GrantFiled: June 21, 1982Date of Patent: July 19, 1983Assignee: American Cyanamid CompanyInventors: Samuel S. Wang, Michael J. Scanlon
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Patent number: 4385038Abstract: A process is disclosed for the recovery of lead, silver and gold from the iron-bearing residue of an electrolytic zinc process by froth-flotating a slurry of the iron-bearing residue in the presence of a sulfidic collector agent in order to froth-flotate the sulfides and to separate them from the iron-bearing residue. The iron-bearing residue is sulfidized selectively in order to convert the lead, silver and possibly gold substantially quantitatively to sulfides before the iron-bearing residue is froth-flotated.Type: GrantFiled: September 29, 1981Date of Patent: May 24, 1983Assignee: Outokumpu OyInventors: Jussi K. Rastas, Kaarlo M. J. Saari, Vaino V. H. Hintikka, Jaakko O. Leppinen, Aimo E. Jarvinen
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Patent number: 4377473Abstract: A method for separating the exinite group macerals from the total coal by froth flotation in the presence of at least one short chain alcohol frothing agent and at least one methyl polyglycol type frothing agent in a first froth flotation zone to produce an exinite and other coal maceral-rich stream which is thereafter subjected to froth flotation in a second froth flotation zone in the presence of a short chain alcohol frothing agent to produce an exinite group maceral-rich stream and a stream rich in other coal macerals with the exinite-rich stream thereafter being mixed with an additional quantity of a short chain alcohol frothing agent and passed to a third froth flotation zone to produce an exinite group maceral group concentrate stream which is thereafter processed to produce a particulate exinite maceral group concentrate.Type: GrantFiled: July 16, 1981Date of Patent: March 22, 1983Assignee: Atlantic Richfield CompanyInventors: Timothy J. Laros, Richard D. Pick
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Patent number: 4376043Abstract: Zinc and lead are separated together out of dust derived from a gas-cleaning installation in iron or steel making by a flotation-separation treatment. In order economically to provide a good separation of these metals and to leave a residue which is re-usable in an ore-preparation process in the iron and steel industry, the flotation-separation treatment is at a pH of 7 to 9 and is effective to achieve a separation, according to size of the dust particles, of a floated component in which the zinc and lead are concentrated and a non-floated component which is suitable for re-use.Type: GrantFiled: May 11, 1981Date of Patent: March 8, 1983Assignee: Estel Hoogovens B.V.Inventors: Cornelis P. Heijwegen, Willem Kat
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Patent number: 4368117Abstract: A process for the selective froth-flotation of sulfidic, oxidic and salt-type minerals, whereby an ore is first wet ground to the flotation fineness to obtain a slurry and then the obtained slurry is prepared and froth-flotated. In addition to the collector agent a polysaccharide, lignosulfonate, quargum and/or a surface active additional chemical is used which prevents the collector agent from adhering to the silicate surfaces and passivates active silicate mineral surfaces, or weakens the hydrophobia of minerals to which the collector agent has already adhered. The collector agent and the additional chemical may be added as early as the wet-grinding stage.Type: GrantFiled: February 18, 1981Date of Patent: January 11, 1983Assignee: Outokumpu OyInventor: Vaino V. H. Hintikka
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Patent number: 4366127Abstract: The impure jarosite residue of an electrolytic zinc process is leached in a sulfuric-acid-bearing solution in order to produce a leach residue which contains lead, silver and gold and a ferrisulfate-bearing solution and to separate them from each other, whereafter the leach residue is sulfidized and froth-flotated in order to recover a combined concentrate which contains lead, silver and gold, and the ferrisulfate-bearing solution is fed to a ferritic treatment stage, in which ferrisulfate and ferrites react in the presence of ions of alkali and ammonium at 80.degree.-105.degree. C. and form pure jarosite and zinc sulfate.Type: GrantFiled: September 29, 1981Date of Patent: December 28, 1982Assignee: Outokumpu OyInventors: Jussi K. Rastas, Jens R. Nyberg
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Patent number: 4366050Abstract: A scheelite concentrate is recovered from a scheelite ore containing silicate minerals and other calcareous minerals by froth flotation which process comprises grinding the ore sufficiently fine to liberate the scheelite grains, pulping the gound ore with water to form a slurry containing between about 20% and about 40% solids by weight, sequentially conditioning the slurry with at least one alkali metal carbonate in small but effective amounts to provide an alkaline pH adjustment and a source of carbonate ions, with small but effective amount of alkali metal silicates to depress siliceous and calcareous gangue minerals other than scheelite and with a fatty acid collector in small but effective amounts to coat the scheelite grains, the conditioning with the fatty acid collector being conducted with sufficient agitation to disintegrate floccules of scheelite, silicate mineral and other calcareous mineral grains and to preferentially reflocculate the scheelite grains for a period of time sufficient to produce uType: GrantFiled: January 19, 1981Date of Patent: December 28, 1982Assignee: Amax Inc.Inventors: Eric J. Olin, Harry B. Carson, Brian Ball