Processes Patents (Class 209/164)
  • Patent number: 5282538
    Abstract: A flotation method for separating particulate material including at least two separate passageways within each of which slurry is separated from froth by an interface, a feed supply within each passageway for feeding the slurry into each passageway below the interface, bubble generator located below or within the passageways, and at least one tailings outlet below the bubble generator.
    Type: Grant
    Filed: July 6, 1992
    Date of Patent: February 1, 1994
    Assignee: Multotec Cyclones (Proprietary) Limited
    Inventor: Michael H. Moys
  • Patent number: 5277317
    Abstract: A floating method employing a cylindrical chamber having a tapered bottom to which there are secured a pipe for feeding a flotation pulp carrying mineral particles of fine fraction and a pipe for discharging gangue. Secured to the walls of the chamber is a trough for collecting froth concentrate, and a group of pulp aerators, whereas positioned axially inside the chamber is a group of tapered shells spaced equidistantly from one another with bases of larger diameter thereof facing the top part of the chamber and resting substantially at one tapered surface. Positioned over the chamber is a means for feeding mineral particles of coarse fraction in the form of a hydrocyclone, a cylindrical casing of this hydrocyclone having a pipe for evacuating the liquid phase of the floatation pulp positioned tangentially and communicating with the pipe for feeding the flotation pulp carrying mineral particles of fine fraction.
    Type: Grant
    Filed: April 22, 1993
    Date of Patent: January 11, 1994
    Inventors: Mikhail N. Zlobin, Georgy P. Permyakov, Alexandr A. Nemarov, Viktor M. Metsik, Jury V. Medetsky, Nikolai T. Taraban
  • Patent number: 5273624
    Abstract: A method and several embodiments of apparatus are disclosed for use in foam flotation separation. The method discloses performing the separation in a module operated at nonatmospheric pressure, and the apparatus disclosed are suitable for use as the module of the method. Both the method and the apparatus contemplate positive and negative pressure operation.
    Type: Grant
    Filed: January 7, 1993
    Date of Patent: December 28, 1993
    Assignee: Beloit Technologies, Inc.
    Inventors: Jeffrey L. Chamberlain, Michael A. McCool
  • Patent number: 5236596
    Abstract: A method and apparatus for dewatering an aqueous coal slurry includes imparting high shear forces to the aqueous coal slurry in the presence of a peptizing agent to render coal particles hydrophobic by stripping clay from the coal particles and peptizing the clay in the aqueous medium of the slurry. The slurry is separating to recover coal particles and the aqueous medium is draining medium from the hydrophobic surface of the coal particles.
    Type: Grant
    Filed: July 24, 1991
    Date of Patent: August 17, 1993
    Inventor: Edward H. Greenwald, Sr.
  • Patent number: 5223148
    Abstract: A process and an apparatus are described for separation of water and solids from oil sands froth in which heated froth is fed into a gravity settling vessel at a level below a bitumen-water interface established between a bitumen froth layer floating on a quiescent body of water whereby water and solids contained in the froth separate from the froth stream, the oil rises to accumulate in the bitumen froth layer, and the solids fall by gravity to the bottom of the gravity settling vessel. The apparatus comprises an injector manifold suspended horizontally within the vessel below the bitumen-water interface, said injector manifold having a plurality of equispaced, inwardly facing openings for the inward discharge of oil sands froth into the body of water. The injector ring manifold may also have a plurality of outwardly facing openings for both inward and outward discharge of froth.
    Type: Grant
    Filed: November 12, 1991
    Date of Patent: June 29, 1993
    Assignee: Oslo Alberta Limited
    Inventors: Robert N. Tipman, Varagur S. V. Rajan, Dean Wallace
  • Patent number: 5219467
    Abstract: The present invention relates to a method for concentrating a certain mineral fraction attached to air bubbles from a slurry to the foam layer accumulated on the surface, so that the concentration takes place in three different mixing zones. The apparatus of the invention is formed of a colon-like flotation arrangement and of flow guides, a flow attenuator and an agitator belonging thereto. The flotation reactions are created in the bottom zone, wherefrom air bubbles and mineral particles carried by them are directed in a controlled fashion onto the surface of the apparatus. The flotation apparatus is so designed, that a strong agitation in the bottom zone can be used without causing harmful separation of the foam in the bottom part of the apparatus.
    Type: Grant
    Filed: June 2, 1992
    Date of Patent: June 15, 1993
    Assignee: Outokumpu Research Oy
    Inventors: Bror G. Nyman, Seppo S. Jounela, Launo L. Lilja, Valto J. Makitalo
  • Patent number: 5207920
    Abstract: A highly versatile fluids and particulate separator that can be used in a centrifugal mode or centrifugal with gas flotation mode without the use of rotating apparatus within the cell. A pump and recirculation system provide the means for centrifugal force and gas flotation. A buoyant self adjusting discharge assembly with a vortex of fluids surrounding it provide the exit path for separated light fluids and light particles. In oil and water separation the buoyant assembly allows self discharge of the oil and can be used with high oil to water ratios at high volume. Oil spill cleanup is possible. Conversely gas flotation may be used for low volume separating applications.
    Type: Grant
    Filed: March 23, 1992
    Date of Patent: May 4, 1993
    Inventor: Raymond Jones
  • Patent number: 5192423
    Abstract: An apparatus and a process for separating particles in a slurry based on different physical, magnetic and/or chemical properties of the particles, the slurry including a mixture of solid particles and/or liqid particles which are immiscible in the slurry.
    Type: Grant
    Filed: January 6, 1992
    Date of Patent: March 9, 1993
    Assignee: Hydro Processing & Mining Ltd.
    Inventors: Tomasz Duczmal, Jakob H. Schneider
  • Patent number: 5192422
    Abstract: A stream containing kerogen-rich and mineral-rich oil shale particles flow in a downward helical course such that the stream is confined in a manner to give the stream an outer and upper side having a first depth and comprising a substantial amount of said kerogen-rich particles, and an inner and lower side having a second depth and comprising a substantial amount of said mineral-rich particles, the first depth being greater than the second depth. The kerogen-rich and mineral-rich particles are subsequently separated in order to recover the kerogen-rich particles. The mineral-rich particles are further processed using froth flotation.
    Type: Grant
    Filed: December 31, 1991
    Date of Patent: March 9, 1993
    Assignee: Amoco Corporation
    Inventor: Bernard Y. C. So
  • Patent number: 5188726
    Abstract: A method of operating a plurality of minerals separation flotation cells (1,2) each having a feed inlet (9,14) a values outlet (11) and a gangue outlet (12,15), and each flotation cell being located at substantially the same level. A feed box (3) is located alongside the flotation cells (1,2) which are connected in series such that the outlet (7) from the feed box (3) is connected via a first pump (8) to the feed inlet (9) of a first flotation cell (1), the gangue outlet (12) from the first flotation cell (2) is connected via a second pump (13) to the feed inlet (14) of the next flotation cell (2), and so on until all of the flotation cells are connected in series. Each flotation cell also has a recycle outlet (19) from the lower part of the flotation cell arranged to return a predetermined proportion of the material flowing through that flotation cell to the feed box (3).
    Type: Grant
    Filed: May 3, 1991
    Date of Patent: February 23, 1993
    Assignee: University of Newcastle Research Associates Ltd.
    Inventor: Graeme J. Jameson
  • Patent number: 5186820
    Abstract: A process for separating bitumen from tar sands, which comprises: a) agitating a mixture of tar sand with substantially coarse clean sand at ambient or below ambient temperature in the presence of water, so as to mechanically shear bitumen and enhance the detachment of bitumen particles from mineral matter in said tar sand, b) eluting the detached bitumen and fine mineral matter from the coarse sand by an upward flow of water while stirring gently, c) returning the coarse sand to step a) for reuse, and d) subjecting the eluted bitumen and fine mineral matter to froth flotation to separate the bitumen from said fine mineral matter, wherein the flotation is effected without using any reagents.
    Type: Grant
    Filed: December 4, 1991
    Date of Patent: February 16, 1993
    Assignee: University of Alabama
    Inventors: Clifford W. Schultz, G. Daniel Irvin
  • Patent number: 5182014
    Abstract: Micron sized gas bubbles produced by electrolysis (e.g., oxygen and/or hydrogen gas bubbles by the electrolysis of water) are introduced into a flotation cell which is also provided with larger bubbles produced by sparging a gas such as air into the flotation cell. The mixed presence of both large bubbles and small bubbles serves to improve the recovery of various copper-containing ores. The small bubble producing electrodes can be retrofitted into an existing sparged gas driven flotation cell.
    Type: Grant
    Filed: May 30, 1990
    Date of Patent: January 26, 1993
    Inventor: Laurence R. Goodman
  • Patent number: 5116487
    Abstract: A froth flotation method and apparatus for the recovery of ultra-fine constituent are provided. The apparatus includes a flotation column having a drain for withdrawing tailings and underflow and an overflow for recovering the selected ultra-fine constituent. A mechanism is provided for delivering a wash medium to an upper portion of the column as well as for delivering diffuse air to a lower portion of the column. A slurry including the constituent to be recovered is received and conditioned within a tank that is connected by means of a feed line to the column. Additionally, a mechanism is provided for dissolving air in the slurry in the conditioning tank. Further, one or two matrixes may be mounted across the flotation column to further improve recovery.
    Type: Grant
    Filed: July 27, 1990
    Date of Patent: May 26, 1992
    Assignee: University of Kentucky Research Foundation
    Inventors: Bhupendra K. Parekh, John G. Groppo, Jr.
  • Patent number: 5114568
    Abstract: A soil reclamation system that separates the contaminant from all soil particles greater than one micron in diameter and generates resuable soil and contaminant products. The process is based on a novel application of gas-sparged centrifugal separation under operating conditions and equipment specifications tailored to optimize the separation of the particular contaminant. The apparatus is mounted on a front-end loader for mobility and self-contained on site operation.
    Type: Grant
    Filed: July 13, 1990
    Date of Patent: May 19, 1992
    Assignee: Earth Solutions, Inc.
    Inventors: Brian J. Brinsmead, Gary F. Stepenoff, Vicki H. Bess, Gary R. Huxel, John A. Wetmore
  • Patent number: 5098583
    Abstract: In the process for beneficiating a crude kaolin by the method which includes a wet classification step to provide a classified kaolin fraction having a PSD such that at least 50% by weight thereof are of less than 1/2.mu.m ESD and substantially 100% by weight are of less than 10 .mu.m ESD; and one or more steps wherein an aqueous slurry of the classified kaolin is at least partially dewatered by filtration; the improvement which comprises effecting at least one of said one or more filtration steps, by flowing said aqueous kaolin slurry through a ceramic filter plate which is characterized by a porous support layer and an overlying porous filtration layer, the ratio between the respective mean pore sizes of the filtration layer material and the base layer material being between about 2 and 50; the pore size in said filtration layer being in the range of from about 1 to 3 .mu.m, and the pore size in the base layer being in the range of from about 4 to 50 .mu.
    Type: Grant
    Filed: June 4, 1990
    Date of Patent: March 24, 1992
    Assignee: ECC America Inc.
    Inventors: Gary L. Cobb, Michael W. Ginn, L. Gene Broxton
  • Patent number: 5096571
    Abstract: A process for recovering elemental sulfur from volcanic and non-volcanic ores is disclosed. Ore is processed by crushing the ore to a coarse particle size autoclaving to separate the sulfur from the ore, mild grinding to selectively reduce the size of the liberated sulfur particles, flotation and sulfur separation/filtration steps to produce a sulfur of at least 99% purity. The process recovers at least 90% of the elemental sulfur contained in the ore. The particular crushing of the ore and selective grinding techniques for reducing sulfur particles for reducing sulfur particles size are important factors in the efficiency of the process since the grinding techniques inhibit the formation of fine gangue which is difficult to separate from the liberated sulfur.
    Type: Grant
    Filed: December 12, 1989
    Date of Patent: March 17, 1992
    Assignee: Freeport McMoRan Resource Partners, Ltd. Partnership
    Inventors: James T. Womack, Tadeusz K. Wiewiorowski, Vivian C. Astley, Jesus W. Perez, Thomas A. Headington
  • Patent number: 5096572
    Abstract: A froth flotation apparatus includes a gas bubble-particle contact unit including a mixing means for breaking a gas into fine bubbles, such as a packed tower packing or mechanical agitation means, and a separate phase separation unit. A conditioned aqueous pulp containing a mixture of hydrophobic and hydrophilic particles and a substantially inert gas, such as air, are introduced into one end of the contact unit and flow concurrently through the mixing means, such that the gas is broken into fine bubbles which intimately contact and become attached to the hydrophobic particles. The resulting gas bubble-particle mixture is introduced into the phase separation unit which is operated under substantially quiescent conditions. A concentrate fraction containing primarily hydrophobic particles and a tailing containing primarily hydrophilic particles are discharged from the upper and lower portions of the phase separation unit, respectively.
    Type: Grant
    Filed: March 12, 1990
    Date of Patent: March 17, 1992
    Assignee: Board of Control of Michigan Tech. University
    Inventor: JIann-Yang Hwang
  • Patent number: 5087352
    Abstract: A device for controlling the flow of foam which uses a piston-cylinder arrangement to receive foam at the rapid flow rate of a foam generator until the cylinder is substantially full of foam and then to dispense the foam at a lower flow rate by using the piston to gradually push the foam out of the cylinder.
    Type: Grant
    Filed: February 26, 1991
    Date of Patent: February 11, 1992
    Inventor: Howard W. Cole, Jr.
  • Patent number: 5073253
    Abstract: A wire guided float level measurement system includes a float, a nozzle and an ultrasonic level detector which are attachable to an open frame. The float, which is supportable on a froth, is slideably attached to te frame via one or more guide wires, and the nozzle and ultrasonic level detector are fixed near the top of the frame. In operation the frame, with attachments, is disposed in a flotation cell in an upright position so as to traverse a froth layer which is formed in the cell. The float, while supported by the froth so as to follow the froth level, serves as a target for pulses transmitted from the ultrasonic level detector, and the detector continually measures the distance to the float which is an indirect indication of froth level. Any mineral accumulation on the float, which would interfere with its buoyancy, is washed off the top of the float by spraying wash water through one or more nozzles.
    Type: Grant
    Filed: July 11, 1990
    Date of Patent: December 17, 1991
    Assignee: Phillips Petroleum Company
    Inventor: Marshall D. Bishop
  • Patent number: 5062964
    Abstract: In a flotation system, the generated quantity of foam is determined and, independent thereof, process parameters which directly or indirectly affect the generated foam quantity are reduced in their quantity depending on foam quantity. This is brought about by reduction of specific substance flows and also such substance flows that circulate in a flotation system. Production waters used for dilution are partly replaced by fresh water. This precludes an excessive amount of generated foam from causing difficulties in the operation of a flotation system.
    Type: Grant
    Filed: April 6, 1990
    Date of Patent: November 5, 1991
    Assignee: J. M. Voith GmbH
    Inventors: Herbert Ortner, Lothar Pfalzer
  • Patent number: 5059309
    Abstract: An ultrasound flotation unit for separation of tails from liquors obtained by floating ores, wherein the unit comprises a vertically disposed cylindrical mixing chamber that forms a bubble-particle contact region within a cylindrical flotation cell that has a bubble-pulp separation region surrounding said mixing chamber; the chamber having an air feed conduit in a lower portion thereof, an ore pulp feed conduit in a higher portion above said air feeding chamber, an ultrasonic transducer disposed above an aperture in a top portion of the mixing chamber and means for subjecting said chamber to an amount of power in kilowatt-hours per metric ton through a sonic probe to focus an amount in watt/ml of ultrasonic power to the chamber to provide a residence time of slurry within the bubble-pulp separator region that is about 30 to 100 times longer than in the ultrasonic mixing chamber.
    Type: Grant
    Filed: June 21, 1990
    Date of Patent: October 22, 1991
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventor: Cy E. Jordan
  • Patent number: 5041211
    Abstract: A method and apparatus for salvaging conductive material from electrical power transformers. In the method, the transformer core is removed from the transformer casing and cut so as to separate laminations from windings. The windings with conductive materials and insulative paper are cut into relatively short segments. These segments are then subjected to an aqueous caustic solution with sparging for separating the conductive material from paper insulation and lacquer coatings thereon. The solution is treated with a coagulating or flocculating agent in a separate vessel to remove dissolved cellulose, processed to separate oil and PCBs therefrom and then returned to treat additional windings. The method is adapted to continuous processing.
    Type: Grant
    Filed: September 27, 1989
    Date of Patent: August 20, 1991
    Assignee: Trinity Chemical Company, Inc.
    Inventor: Duane P. Koszalka
  • Patent number: 5039400
    Abstract: The invention relates to a flotation machine for flotating minerals and the like from slurries containing these particles. In the flotation machine of the invention, above the feed opening (15) of the flotation cell there is formed a froth bed (11) which is adjustable in volume and/or surface area. The regulating and washing members (10, 13) of the froth bed are arranged within the froth bed (11), and the height of the froth bed is 20-40%, advantageously 30-35% of the height of the flotation cell (1).
    Type: Grant
    Filed: February 27, 1990
    Date of Patent: August 13, 1991
    Assignee: Outokumpu Oy
    Inventors: Jouko O. Kallioinen, Pertti V. O. Koivistoinen, Seppo O. Rantanen
  • Patent number: 5028315
    Abstract: In froth flotation apparatus for separating solid particle impurities from a liquid suspension stock in a flotation cell, provision is made for aerating the stock flowing through the inlet conduit leading to the cell by positioning a drum-shaped rotor having an irregular outer surface in the conduit on an axis extending transversely of the conduit, directing a supply of air against the rotor surface on the upstream side of its rotational axis, and causing the rotor to rotate at a linear speed of its outer surface which is substantially higher than the linear flow rate of the stock in the conduit so that the rotor surface breaks up the air impinging thereon into bubbles and distributes those bubbles in the stock flowing therepast to create foam within the cell.
    Type: Grant
    Filed: December 11, 1989
    Date of Patent: July 2, 1991
    Assignee: The Black Clawson Company
    Inventors: Ronald D. Cruea, Michael F. Kinne
  • Patent number: 5019244
    Abstract: A device for controlling the flow of foam which uses a piston-cylinder arrangement to receive foam at the rapid flow rate of a foam generator until the cylinder is substantially full of foam and then to dispense the foam at a lower flow rate by using the piston to gradually push the foam out of the cylinder.
    Type: Grant
    Filed: December 21, 1988
    Date of Patent: May 28, 1991
    Inventor: Howard W. Cole, Jr.
  • Patent number: 5013359
    Abstract: A process for recovering gold from a refractory sulfidic ore which has been suspended in an aqueous slurry and oxidized using nitric acid so that substantially all of the gold in the ore is made available for recovery and at least a portion of the sulfidic components present during the oxidation are oxidized to elemental sulfur, comprises bubbling air as a discontinuous phase upwardly through the oxidized slurry, thereby creating a froth containing elemental gold and sulfur. The froth is separated from the slurry to provide a concentrate, and the gold is recovered from the concentrate.
    Type: Grant
    Filed: October 31, 1988
    Date of Patent: May 7, 1991
    Assignee: Hydrochem Developments Ltd.
    Inventors: Kenneth J. Fair, Gezinus Van Weert, John C. Schneider
  • Patent number: 4997549
    Abstract: An apparatus and method for separating hydrophilic particles from a fluid suspension containing both hydrophilic and hydrophobic particles. A generally cylindrical separation vessel includes tangential inlet and outlet ports. The fluid suspension is introduced into the separation vessel through the inlet port to circulate around the inner surface of the separation vessel in a forced vortex swirl flow. Air sparged through a porous wall portion of the side walls of the separation vessel forms air bubbles to which attach hydrophobic particles in particle/bubble aggregates. These migrate as a froth towards the axial center of the separation vessel where they are discharged at the upper end thereof. A froth washing tube having an open end proximate to the upper end of the separation vessel discharges pressurized water thereinto.
    Type: Grant
    Filed: September 19, 1989
    Date of Patent: March 5, 1991
    Assignee: Advanced Processing Technologies, Inc.
    Inventor: Ronald L. Atwood
  • Patent number: 4981582
    Abstract: A method and apparatus are disclosed for the microbubble flotation separation of very fine particles, especially coal, so as to produce a high purity and large recovery efficiently. This is accomplished through the use of a high aspect ratio flotation column, microbubbles, and a countercurrent use of wash water to gently wash the froth. Also, disclosed are unique processes and apparatus for generating microbubbles for flotation in a high efficient and inexpensive manner using either a porous tube or an in-line static generator.
    Type: Grant
    Filed: January 27, 1988
    Date of Patent: January 1, 1991
    Assignee: Virginia Tech Intellectual Properties, Inc.
    Inventors: Roe-Hoan Yoon, Gregory T. Adel, Gerald H. Luttrell
  • Patent number: 4971685
    Abstract: A method and apparatus for selectively separating a mixture of hydrophobic and hydrophilic mineral particles. A mineral pulp is prepared which includes minerals ground to a predetermined size. A bubble slurry is then prepared which includes a gas entrained in a liquid to form bubbles of a predetermined size. The mineral pulp and bubble slurry are simultaneously injected into the cell apparatus. The cell has an enclosed body with a feed receiving portion, a narrowed apex portion with an underflow discharge, and an intermediately disposed merger zone. A mineral pulp feed port extends into and is directed tangentially to the feed receiving portion in the mineral pulp feed zone. The bubble slurry feed port, disposed in the same direction as the mineral pulp feed port, extends into and is directed tangentially to the feed receiving portion in the bubble slurry zone.
    Type: Grant
    Filed: April 11, 1989
    Date of Patent: November 20, 1990
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: Donald A. Stanley, Cy E. Jordan
  • Patent number: 4966687
    Abstract: Apparatus for the separation of components of a slurry by froth flotation is disclosed. The apparatus includes a flotation column having an upper section, an intermediate section and a lower section, a spray bar, mounted in the intermediate section of the flotation column, for providing a downwardly directed fine mist in the intermediate section of said flotation column, and at least one spray nozzle mounted in the lower section of the flotation column, the at least one spray nozzle provided with aerating means. A method for the separation of the components of a slurry employing the present apparatus is also disclosed.
    Type: Grant
    Filed: December 19, 1985
    Date of Patent: October 30, 1990
    Assignee: The Standard Oil Company
    Inventor: Richard D. Trigg
  • Patent number: 4960509
    Abstract: A mineral processing device for floating relatively large particles and middling particles is disclosed. The device provides a uniform upward flow of pulp in a flotation zone. Gas bubbles are introduced into the pulp with minimal agitation. Agitation in the flotation zone is also controlled by a plate with a multitude of holes of varying size. The upward flow velocity in the flotation zone is controlled by means of a variable speed impeller and an adjustable partition. Further, a flotation process utilizing uniform upward flow is provided.
    Type: Grant
    Filed: July 17, 1989
    Date of Patent: October 2, 1990
    Assignee: Colorado School of Mines
    Inventor: Harry L. McNeill
  • Patent number: 4950390
    Abstract: An improved apparatus and method for froth flotation separation of the components of a slurry is provided wherein improved recycling capability is provided by utilization of a partition in the flotation tank in which the froth flotation is performed.
    Type: Grant
    Filed: February 23, 1989
    Date of Patent: August 21, 1990
    Assignee: BP America Inc.
    Inventors: Alex Szentlaszloi, Earl T. Robinson
  • Patent number: 4938865
    Abstract: A method and apparatus for the benefication of mineral ores by the flotation method whereby a slurry is introduced under pressure into the top of a first column through a downwardly facing nozzle, and air is entrained into the slurry forming a downwardly moving foam bed in the first column. The foam bed passes from the bottom of the first column into a second column where the froth and liquid separate, the froth carrying the values floating upwardly and over a weir and the liquid being drained with the gangue. The liquid/froth interface level in the second column is kept above the bottom of the first column, and the air flow rate into the top of the first column is controlled to keep the first column substantially full of foam.
    Type: Grant
    Filed: September 25, 1987
    Date of Patent: July 3, 1990
    Assignee: University of Newcastle Research Assoc., Ltd.
    Inventor: Graeme J. Jameson
  • Patent number: 4923125
    Abstract: A process for the purification of soil contaminated with organic material is provided. The preferred process generally involves superposed attrition and classification processes, which lead to removal and concentration of highly contaminated fractions. The process may also include a step of flotation whereby hydrophobic materials in the soil are released to an interface with air bubbles, and are floated to the top of a flotation cell. In preferred processes according to the present invention, soil to be treated is extracted from a contaminated site, and is broken into relatively small particles. These particles are preferably treated in attrition and classification steps, to remove fine, slow settling, contaminated materials such as wood and fine soil materials. The resulting isolated coarser materials are then treated by flotation for a final polishing step.
    Type: Grant
    Filed: August 2, 1989
    Date of Patent: May 8, 1990
    Assignee: BioTrol, Inc.
    Inventors: George F. Bateson, Dennis D. Chilcote, Michael M. Martinson, Steven B. Valine, Adolfo R. Zambrano
  • Patent number: 4913805
    Abstract: An improved apparatus and method for froth flotation of particulate matter is disclosed wherein ridges or ribs are provided on the froth discharge surface of the apparatus.
    Type: Grant
    Filed: February 23, 1989
    Date of Patent: April 3, 1990
    Assignee: BP America Inc.
    Inventor: Ti-Hua Chin
  • Patent number: 4892648
    Abstract: A process for removing mineral matter from coal is disclosed. The process involves creating ultrafine coal by pulverizing the coal feed material and mixing it with an aqueous amine solution. The coal/amine solution is fed into a flotation cell and gaseous carbon dioxide is charged into the cell. The carbon dioxide reacts with the amine solution to form bubbles which carry the "clean" coal component of the coal feed material to the top of the cell for subsequent removal from the cell. The bubbles are reduced in size as they move up within the cell. The mineral matter, which is heavier than the clean coal, stays at the bottom of the cell and can be removed spearately. The amine and the carbon dioxide used in the process can be recycled. An associated apparatus is also disclosed.
    Type: Grant
    Filed: April 20, 1989
    Date of Patent: January 9, 1990
    Assignee: Viking Systems International, Inc.
    Inventor: Amol A. Kulkarni
  • Patent number: 4851036
    Abstract: There is disclosed a process and an apparatus for beneficiating a mineral ore, such as phosphate-containing ore, in a substantially vertical column. The feed subjected to the benefication preferably has a particle size of less than 20 mesh. The feed is introduced into the column, containing at least one baffle, into which there is also introduced a gas at the bottom portion thereof and a liquid through at least one column inlet at the top of the column. The baffle and the rates of introduction of the feed, the gas, and the liquid are such as to create relatively high turbulence conditions within the column. The enriched, beneficiated product is removed at the top of the column, while the waste products, such as silica-containing material, in the case of a phosphate ore, are recovered at the bottom of the column.
    Type: Grant
    Filed: September 18, 1987
    Date of Patent: July 25, 1989
    Assignee: Mobil Oil Corporation
    Inventors: Robert J. Anthes, Ross A. Kremer, Susanne Von Rosenberg
  • Patent number: 4838434
    Abstract: The present invention is directed to air sparged hydrocyclone flotation apparatus and methods for separating particles from particulate suspensions (such as coal and mineral ore slurries), wherein fluid discharge is removed annularly from a flotation vessel. Preferably, the flotation apparatus includes a vertically oriented cylindrical flotation vessel having a tangential inlet at its upper end and an annular outlet at its lower end. The annular outlet allows for the smooth exit of fluid discharge from the flotation vessel so as to avoid disturbance of the fluid flow within the flotation vessel. Air is sparged into the vessel and a froth which contains the recovery products exits through a vortex finder positioned in the upper end of the vessel. The apparatus includes a froth pedestal positioned within the vessel which forms the annular outlet with the wall of the vessel. The froth pedestal may take a generally cylindrical or a generally conical configuration.
    Type: Grant
    Filed: May 17, 1988
    Date of Patent: June 13, 1989
    Assignee: University of Utah
    Inventors: Jan D. Miller, Ye Yi
  • Patent number: 4830737
    Abstract: Apparatus for controlling the flow of a foam uses a bellow enclosed in a housing. The bellows is filled with foam under pressure from a foam generator and expands a preselected amount at which point the flow of foam into the bellows is interrupted. Simultaneously with the interrupting of the flow of foam into the bellows, air under pressure is routed into the housing which causes the bellows to collapse forcing the foam out of the bellows. The apparatus is particularly useful in the froth flotation (benefication) of minerals.
    Type: Grant
    Filed: November 16, 1987
    Date of Patent: May 16, 1989
    Inventor: Howard W. Cole, Jr.
  • Patent number: 4822493
    Abstract: The disclosure herein describes a method for the separation of hydrophobic from hydrophilic materials in a liquid suspension by means of gas bubbles and a flow of water that drags the hydrophobic material upwards. A distinctive feature of the method is an upward flow of water countercurrent to the flow of settling hydrophilic particles. The disclosure describes a cell in which gas is caused to disperse into an ascending flow of liquid and in which a feed port is provided to introduce particles in a flow countercurrent to that of the bubbles and water.
    Type: Grant
    Filed: November 27, 1987
    Date of Patent: April 18, 1989
    Assignee: Universite Laval, Cite Universitaire
    Inventors: Gilles Barbery, Ahmed Bouajila, Heriban Soto
  • Patent number: 4818377
    Abstract: A defrothing apparatus whose inlet opening of the foamed liquid contained in a foam duct of a primary flotation apparatus is provided in the bottom of the foam duct. Starting from the lower area of the defrothing apparatus, a rotary flow (potential vortex) is generated in the apparatus by a recirculated lqiuid quantity from a secondary flotation apparatus. In the core of the rotary flow the gas quantity (air) is collected and removed through a removal pipe. Consequently, the foamed liquid from the foam duct of the primary flotation stage which is pumped to the secondary flotation stage contains small shares of gas relative to the total quantity of liquid, thereby allowing the pump to be optimally sized of efficiency and better control of the system.
    Type: Grant
    Filed: October 21, 1987
    Date of Patent: April 4, 1989
    Assignee: J.M. Voith GmbH
    Inventors: Peter Schweiss, Hans-Dieter Dorflinger
  • Patent number: 4804460
    Abstract: In the froth flotation of ore in a column, the froth/pulp interface level and the efficiency of the froth washing operation are controlled by determining a profile of temperatures measured in the froth layer and slurry below the interface. Temperatures are measured with temperature sensing elements immersed in the froth layer and extending to below the interface level. The measured profile is compared with a target profile and deviations are corrected by changing the tailings flowrate or the washwater flowrate to return a measured profile to the target profile. An inflection point in the profile occurs at the interface level. The inflection point in a measured profile is compared with a level set point, and a deviation from set point value is corrected by increasing or decreasing the flow of tailings whereby the interface level returns to its set point.
    Type: Grant
    Filed: March 1, 1988
    Date of Patent: February 14, 1989
    Assignee: Royal Inst. for Advancement of Learn., A.K.A. (McGill Univ.)
    Inventors: Michael H. Moys, James A. Finch
  • Patent number: 4759854
    Abstract: This invention relates to a grit trap which is intended for use in removing grit from a flow of sewage. The grit trap is of the kind which includes a settlement chamber which has an inlet through which the flow of sewage can flow and an outlet from which treated sewage can flow. There is also provided a grit storage chamber which is disposed between the settlement chamber and in which in use the separated grit will collect, the settlement chamber having a mixing device for promoting a desired motion to the flow of sewage entering the settlement chamber. In accordance with the invention said mixing device comprises a disc 25 which is provided with a plurality of generally radially extending blades, said disc being located just above the upper end of the grit storage chamber.
    Type: Grant
    Filed: September 23, 1987
    Date of Patent: July 26, 1988
    Assignee: Jones & Attwood Limited
    Inventor: Reginald A. E. Wilson
  • Patent number: 4752383
    Abstract: An apparatus and method for generating gaseous bubbles in a liquid body comprises a bubble chamber for mixing a pressurized gas with a liquid at a pressure greater than atmospheric and a fine injector tip for releasing the pressurized gas-liquid mixture from the bubble chamber under a high tip velocity and shear. The apparatus is adapted for supplying bubbles to a flotation column for the treatment of mineral ore materials.
    Type: Grant
    Filed: August 5, 1986
    Date of Patent: June 21, 1988
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: Jeffrey D. McKay, Donald G. Foot, Jr.
  • Patent number: 4749473
    Abstract: Wastepaper is treated by a ink-removing process in which an aqueous wastepaper pulp slurry is introduced into a treating vessel, air is blown into the wastepaper pulp slurry preferably through a number of air-blowing orifices formed on a peripheral surface of at least one horizontal cylinder located in the bottom portion of the vessel to absorb ink particles floating in the wastepaper pulp slurry by air bubbles ejected from the orifices and rising toward the wastepaper pulp slurry surface. The resultant ink-absorbed froth is then removed. In this process, air is blown in an amount satisfying the relationship (I)G/L.gtoreq.5.0 (I)wherein L is the volume (m.sup.3) of the wastepaper pulp slurry in the treating vessel and G is the total volume (Nm.sup.3) of the air bubbles blown into the vessel, to promote the contact of the air bubbles with the ink particles in the wastepaper pulp slurry.
    Type: Grant
    Filed: July 1, 1987
    Date of Patent: June 7, 1988
    Assignee: Oji Paper Co., Ltd.
    Inventors: Akira Shioiri, Yoji Isobe, Hiroyasu Hayano
  • Patent number: 4744890
    Abstract: Flotation apparatus and methods for separating particles from particulate suspensions such as coal and mineral ore slurries, wherein fluid discharge is removed annularly from a flotation vessel. Preferably, the flotation apparatus includes a vertically oriented, cylindrical flotation vessel having a tangential inlet at its upper end and an annular outlet at its lower end. The annular outlet allows for the smooth exit of fluid discharge from the flotation vessel so as to avoid disturbance of the fluid flow within the flotation vessel. The apparatus includes a froth pedestal positioned within the lower end of the vessel which forms the annular outlet with the wall of the vessel. The froth pedestal further serves to support a froth column formed within the flotation vessel and isolates the froth column from the fluid discharge so as to minimize mixing therebetween.
    Type: Grant
    Filed: March 21, 1986
    Date of Patent: May 17, 1988
    Assignee: University of Utah
    Inventors: Jan D. Miller, David J. Kinneberg
  • Patent number: 4737272
    Abstract: A method for improving separation of the flotable phase from the non-flotable phase of a slurry of particulate material in a froth flotation machine comprising a tank, an upper outlet port for discharge of the flotable phase, and a mechanism for delivering air to the slurry in the tank to form a froth which includes a mixture of air bubbles and the flotable phase from the slurry, with the rate and selectivity of separation of the flotable phase from the slurry for predetermined size particles of the flotable phase and at a predetermined concentration of the flotable phase being dependent on the total volume and size distribution of the air bubbles generated in the slurry, the method of this invention comprising the steps of providing a quantity of slurry in the tank, generating air bubbles of relatively small size and relatively large size, and controlling the volume of air as small bubbles and the volume of air as large bubbles in response to the concentration of the flotable phase of the slurry for enhanced
    Type: Grant
    Filed: April 11, 1986
    Date of Patent: April 12, 1988
    Assignee: Baker International Corporation
    Inventors: Marian Szatkowski, Wilfred L. Freyberger
  • Patent number: 4735709
    Abstract: A froth flotation system for separating a mineral fraction from an aqueous pulp containing a mixture of mineral and gangue particles. The aqueous pulp is supplied to a pulp-filled vessel (or column) wherein a froth is formed on the surface of the pulp and collected in a launder. Gas bubbles are introduced into the pulp in the vessel by two different means to generate the froth. In accordance with one means, water is aspirated into a stream of pressurized gas (air) to form a stream of aerated water which is injected into the lower portion of the pulp-filled vessel. In accordance, the other means, a second stream of pressurized gas (air), is sparged through a porous wall of one or more micro-diffusers located within the vessel. The dual means for generating bubbles produces a significantly higher level of mineral separation than can be achieved from either means separately.
    Type: Grant
    Filed: January 21, 1987
    Date of Patent: April 5, 1988
    Assignee: Deister Concentrator Company, Inc.
    Inventor: Donald E. Zipperian
  • Patent number: H458
    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.
    Type: Grant
    Filed: September 29, 1986
    Date of Patent: April 5, 1988
    Assignee: The Standard Oil Company
    Inventors: Robert F. Turner, Jr., Bruce C. Stouch
  • Patent number: H871
    Abstract: A process for the froth flotation beneficiation and separation of molybdenite from copper mining by-product is disclosed.
    Type: Grant
    Filed: February 23, 1989
    Date of Patent: January 1, 1991
    Assignee: BP America Inc.
    Inventor: Ti-Hua Chin