Liquids Added To Make Pulp Or Suspension Patents (Class 241/21)
  • Patent number: 4643361
    Abstract: In a method of operating a ball or rod mill that comprises milling substrate with an attrition medium in the presence of an aqueous carrier. An anti-corrosion composition comprising a water soluble, (alkali metal) phosphate and a water soluble zinc salt is maintained in the aqueous carrier.
    Type: Grant
    Filed: October 17, 1984
    Date of Patent: February 17, 1987
    Inventor: Terrence R. Chapman
  • Patent number: 4643363
    Abstract: Fired phosphor powder is deagglomerated by introducing a slurry thereof to the bottom of a vibratory mill while water is added to the top of the mill. This establishes a vertical gradient in the phosphor concentration in the slurry, the bottom being thicker than the top. The fine phosphor particles move out faster through an outlet at the top, while the coarse particles receive longer milling time.
    Type: Grant
    Filed: June 4, 1981
    Date of Patent: February 17, 1987
    Assignee: GTE Products Corporation
    Inventor: Robert A. Long
  • Patent number: 4635859
    Abstract: A centrifugal grinder with an internal grinding surface and a rotor turning within that surface includes a passage for inserting material axially into the rotor and a pocket to allow the material to contact the internal grinding surface. A spray is provided on the rotor at a location trailing the pocket, to spray liquid against the internal surface and make a slurry with ground material. An element of air-foil shape is mounted on the rotor at a location trailing the spray, the air-foil having a rounded contacting portion juxtaposed against the internal grinding surface, and have the effect of lifting the slurry away from the surface. A scoop trails the foil and has a leading edge juxtaposed against the internal grinding surface, defining a pocket for collecting the scooped-up slurry. A compartment is located axially beyond the grinding surface and a passage allows the scooped up slurry to pass from the pocket of the scoop to the compartment.
    Type: Grant
    Filed: May 29, 1985
    Date of Patent: January 13, 1987
    Assignee: AMCA International Limited
    Inventor: Allan J. Wildey
  • Patent number: 4629130
    Abstract: Finely divided limestone is produced by abrasively grinding limestone in an aqueous media in the presence of added dissolved carbon dioxide or in the presence of a soluble acid-forming compound, the anion of which forms a soluble calcium compound, or in the presence of both dissolved carbon dioxide and an acid-forming compound. The finely divided limestone is used in a dry flue gas desulfurization process.
    Type: Grant
    Filed: November 2, 1983
    Date of Patent: December 16, 1986
    Assignee: A/S Niro Atomizer
    Inventor: Preston L. Veltman
  • Patent number: 4625922
    Abstract: A slurry pump (40) pumps a slurry of vulcanized rubber pellets and water from a slurry mixing region (30) to a mill (B). The slurry passes through a comminuting zone (80) defined between an abrasive stator (66) and an abrasive rotor (76). As the slurry is comminuted in the comminuting zone, heat is generated, which heat is absorbed by at least the water. The comminuted rubber particles and water pass from the mill to a separator (C) which separates the rubber particles from the heated water. The heated water is conveyed to a hot water reservoir (24) from which it is recirculated to the slurry mixing region. Additional pellets from a pellet supply (10) are fed to the mixing region to be mixed with the recirculated heated water. In this manner, the slurry is preheated above room temperature prior to comminution. It has been found that increasing the water temperature to about 130.degree. F. rather than using city water of about 55.degree. F., increases the production rate of the mill by about 20 to 25 percent.
    Type: Grant
    Filed: January 4, 1985
    Date of Patent: December 2, 1986
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Ronald L. Brubaker, Robert Calevich
  • Patent number: 4624417
    Abstract: The present invention is an energy efficient process for converting solid waste and/or sewage sludge into a chemical intermediate substrate for production of energy and/or separate non-energy related by-products. The process of this invention integrates technologies for: slurry production and material recovery; slurry demineralization and heavy metal recovery; formation and storage of chemical intermediate substrate; its dewatering; its processing into various energy sources such as solid carbon fuel, steam, or methane gas; and/or production of non-energy by-products such as cement board, gypsum fiber board, or agricultural products.
    Type: Grant
    Filed: June 11, 1984
    Date of Patent: November 25, 1986
    Assignee: Newest, Inc.
    Inventor: Alfred J. Gangi
  • Patent number: 4621773
    Abstract: A slurry feeding assembly (A) feeds a mixture of water and rubber pellets to a comminuting region defined between a rotor (74) and a stator (66). As an electric rotor motor (70) rotates the rotor relative to the stator, a power monitor (114) monitors of a control circuit (D) the amount of electrical power drawn thereby. The control circuit controls a pressure regulator (C) to increase and decrease the pressure between the rotor and stator in such a manner that the power drawn by the electric rotor motor remains substantially constant. The control circuit further initiates operation of various components of the comminuting apparatus in a preselected order. Specifically, the control circuit first starts the feed of water or other fluid to the rotor and stator. Thereafter, the electric rotor motor is started, followed by enabling of the pressure regulator assembly.
    Type: Grant
    Filed: November 21, 1984
    Date of Patent: November 11, 1986
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Robert Calevich, George V. Chinchar
  • Patent number: 4620672
    Abstract: A system for converting a coal slurry flowable through a pipeline to a coal water mixture capable of being rendered suitable for direct combustion in a boiler. The system includes a pipeline extending from a region adjacent to a mine or source of coal to a region adjacent to a boiler or furnace at which combustion is to take place. In the furnace region, the slurry from the pipeline is directed into a holding space, such as a pond, from which it is directed to a grinding apparatus. On the way to the grinding apparatus from the pond, a side stream of the slurry is directed through a dewatering apparatus where the concentration of the side stream is increased from 50-55 weight percent of solids to about 70-80 weight percent of solids. The outlet of the dewatering apparatus is directed back to the main flow of slurry from the pond, and the main flow enters the grinding apparatus where the slurry is ground to a particle size suitable for combustion, such as 70-80% weight percent of solids at -200 mesh.
    Type: Grant
    Filed: February 4, 1985
    Date of Patent: November 4, 1986
    Assignee: Bechtel International Corporation
    Inventors: Irving Leibson, Horst Huettenhain
  • Patent number: 4620671
    Abstract: A process is provided for refining a pollutant laden suspension of waste paper using refining apparatus including a housing adapted to induce a turbulent flow in the suspension so as to separate the suspension into various fractions. Turbulent flow is created by the action of a rotary blade which is contained within a primarily rotation-symmetrical closed housing. The turbulent flow has a lower-pressure center about its axis. Along its radial edge, a fraction laden with heavy impurities or pollutants is removed while along the axial end where the rotary blade is positioned, a fraction of material is removed by a screen which is positioned next to the blade. Along the other axial end across from the end of the housing having the rotary blade, another fraction laden with pollutants is removed from the center. Air is fed directly into the refining apparatus where it is admixed with the suspension in order to facilitate separation of the suspension with the various fractions.
    Type: Grant
    Filed: May 29, 1984
    Date of Patent: November 4, 1986
    Assignee: J. M. Voith GmbH
    Inventor: Thomas F. Skaar
  • Patent number: 4613084
    Abstract: A process for producing a coal-water slurry having a high coal concentration (generally 60 to 80% by weight or more) and a lower viscosity, at a lower cost and with a smaller amount of dispersing agent added is provided, which process is directed to a process for producing a high concentration coal-water slurry by feeding coal, water and a dispersing agent into a wet, continuous ball mill and wet-milling them, characterized by feeding the dispersing agent in a multi-stage manner along the milling direction of coal within the ball mill.
    Type: Grant
    Filed: June 27, 1984
    Date of Patent: September 23, 1986
    Assignee: Babcock-Hitachi Kabushiki Kaisha
    Inventors: Shigehito Takamoto, Kazunori Shoji, Nobuyasu Meguri, Yoshinori Ohtani, Hirofumi Kikkawa, Yasuyuki Nishimura, Hiroyuki Kaku, Masayasu Murata
  • Patent number: 4606503
    Abstract: The invention relates to a process for wet grinding of natural and/or synthetic carbonates in wet suspensions in which the viscosity of the mass is decreased and a favorable particle size range distribution is obtained having a small portion of very fine overground particles. The carbonates in the wet grinding are mixed with zeolites to 0.05 to 3.0% by weight based on the dry weight of the carbonates. Chemical dispersants are used to help effect the process.
    Type: Grant
    Filed: December 13, 1983
    Date of Patent: August 19, 1986
    Assignee: Columbia River Carbonates
    Inventor: Joerg A. Bleeck
  • Patent number: 4598873
    Abstract: In order to enable a reduction of the percentage of liquid in a liquid/coal pumping mixture the coal is dry-ground in a first grinding stage (1) to provide a relatively coarse particle size and then a fraction of the coarse ground coal is then dry-ground in a second grinding stage (9) to a relative fine particle size. The fine ground fraction is then mixed with the remainder of the coarse-ground fraction (7) and with the liquid.
    Type: Grant
    Filed: June 1, 1983
    Date of Patent: July 8, 1986
    Assignee: F. L. Smidth & Co. A/S
    Inventor: Jorgen Cleemann
  • Patent number: 4593859
    Abstract: This process, which comprises subjecting coal to gravity classification to classify into a low ash coal, a middle ash coal and a high ash coal; deashing the middle ash coal by flotation; and using the deashed middle ash coal together with the low ash coal as the materials for producing a coal-water slurry, provides a low ash content and high solid content coal-water slurry in a high coal recovery as well as economically. This coal-water slurry is able to handle, store and burn as are fuel oils.
    Type: Grant
    Filed: May 17, 1984
    Date of Patent: June 10, 1986
    Assignees: Electric Power Development Co., Ltd., Kawasaki Jukogyo Kabushiki Kaisha, Sumitomo Heavy Industries, Ltd.
    Inventors: Kazuhiko Nakaoji, Mitsugu Kamao, Kunizo Shinano, Takashi Kuwabara, Masazumi Ito, Kaoru Aoki, Hayami Ito, Shuhei Tatsumi, Shoichi Takao, Nitaro Suzuki, Takashi Watanabe
  • Patent number: 4591103
    Abstract: A process of recovering asbestos fibre from asbestos-bearing material comprising a first stage of preparing a fibre concentrate by the steps of comminution, classification and spiral concentration and a second stage of liberating and recovering fibre, wherein in the second stage there is a separation by means of a hydrocyclone into a well-opened fraction and a poorly opened fraction, and wherein the asbestos-bearing material is substantially moist throughout the process.
    Type: Grant
    Filed: January 25, 1984
    Date of Patent: May 27, 1986
    Assignees: ICI Australia Limited, Woods Reef Mines Ltd.
    Inventors: John R. Andrews, Philip S. B. Stewart, George T. Hurst
  • Patent number: 4588134
    Abstract: A process for treating pollen which comprises freezing said pollen grains by immersing in low temperature liquefied gas so as to make them low temperature brittle, and pulverizing said pollen grains while they are still in the low temperature brittle state by means of a pulverizer of impact type, or further adding aqueous ethanol solution as the solvent to the pollen grains treated in the above manner, and after extracting the effective ingredients of said pollen grains at room to elevated temperatures with stirring, removing the residue and then concentrating the clear extract thus obtained under vacuum.
    Type: Grant
    Filed: July 18, 1984
    Date of Patent: May 13, 1986
    Assignee: Saitama Bee-Keeping Co., Ltd.
    Inventors: Shinichi Shimizu, Tetuo Rikiishi, Yasuo Koyama
  • Patent number: 4585547
    Abstract: The present invention is directed to a method and apparatus for separating coal from impurities, which comprises a first and second tank including drag conveyor means and agitation means for the combination of saturating a raw mass containing coal and impurities, dispersing the impurities in to water, separating the coal from the impurities and flowing the mass from the front of the tanks to the rear of the tanks. A crusher as arranged between the tanks through conveyor means for transferring the mass between from one tank to the crusher and from the crusher to the other tank. The mass from the second tank is conveyed in to a separator pan which includes a separator plate, the separator plate having a configuration and being located within the separator pan at a position, so that an upper flow portion of the mass having a lower specific gravity passes thereover, and so that a lower flow portion of the mass having a higher specific gravity passes thereunder and out a hole in the bottom of the separator.
    Type: Grant
    Filed: September 14, 1984
    Date of Patent: April 29, 1986
    Inventor: G. W. Nicholson
  • Patent number: 4582261
    Abstract: A pulper to convert bulky, solid wastes from food service establishments into a uniform, moist pulp. The material is pulverized in a first section and transferred as a slurry to a second section where the slurry is dewatered by an auger. To prevent clogging of the auger, a portion of the liquor extracted from the pulp is introduced as a jet stream into the upstream end of the auger to create turbulence. Additionally, a reverse flow of water through a drain chamber in excess of the amount of water required for make-up in the system is employed to prevent clogging of the screen covering the drain.
    Type: Grant
    Filed: May 18, 1984
    Date of Patent: April 15, 1986
    Assignee: Adamation
    Inventor: Kenneth E. Perry
  • Patent number: 4579563
    Abstract: A method and apparatus fluidizes solid deposits of coal tar sludge, such as coal tar decanter sludge or coal tar tank sludge to a relatively homogeneous mixture of solids dispersed in liquid. The coal tar decanter sludge received from the coke oven, including approximately 10 to 50% by weight coal and coke solids, is conveyed into a sludge mixing vessel where it is deposited onto a liquid-permeable support member or screen having a predetermined maximum screen size. A suitable coal tar solvent in the sludge mixing vessel is heated to a temperature sufficient to partially solubilize and reduce the viscosity of the coal tar portion of the coal tar decanter sludge to provide a pumpable dispersion of solids dispersed in a diluted coal tar mixture. Agglomerates of coal and coke solids held together with coal tar fall through the screen when sufficient coal tar has solubilized and the solid agglomerates then are reduced in size for recirculation to the sludge mixing vessel.
    Type: Grant
    Filed: April 15, 1985
    Date of Patent: April 1, 1986
    Inventors: Kenneth D. Burnside, Daniel C. Deer, III
  • Patent number: 4578148
    Abstract: A process for manufacturing bleached groundwood pulp of improved and uniform quality, in which debarked wood logs or wood chips are ground in a closed pocket grinder at atmospheric or super-atmospheric pressure, while applying shower water to the free surfaces of the grindstone, and shower water containing bleaching chemicals to the grinding zone where the wood is in contact with the grindstone, i.e.
    Type: Grant
    Filed: November 1, 1984
    Date of Patent: March 25, 1986
    Assignee: Mo och Domsjo Aktiebolag
    Inventor: Jonas A. I. Lindahl
  • Patent number: 4578147
    Abstract: A process is provided for manufacturing groundwood pulp of uniform quality by maintaining a high and uniform moisture content in the wood in the grinding zone which comprises grinding debarked wood logs or wood chips in a closed pocket grinder under atmospheric or superatmospheric pressure while applying shower water both to the free surfaces of the grindstone and to the grinding zone where the logs or chips are in contact with the grindstone, such as by spraying the water at the end portions of the logs or chip mass, optionally together with applying shower water via the ram plates and a water trap arranged around the lower part of the log pockets, and preferably retaining shower water within the grinding zone by filling with shower water the hollows between the logs or chips located nearest the surface of the grindstone.
    Type: Grant
    Filed: March 1, 1983
    Date of Patent: March 25, 1986
    Assignee: Mo och Domsjo Aktiebolag
    Inventors: Jonas A. I. Lindahl, Gustaf E. Johnsson
  • Patent number: 4577804
    Abstract: Phosphate rock contained in an acidic slurry is ground by equipment wherein the acidic slurry contacts the metallic surfaces of the equipment. A method for monitoring and controlling grinding ball consumption is provided in which acid-neutralizing particulate iron contained in the acidic slurry is measured and correlated to control curves, which relate particulate iron concentration to slurry pH and slurry pH to the rate grinding ball consumption. If the measured particulate iron concentration equates to an unacceptable ball corrosion rate, the equilibrium of the slurry pH and particulate iron concentration can be varied to maintain a predictable ball consumption. When making the slurry, waste water from other steps of the wet process manufacture of phosphoric acid can be used as part of an acidic diluting medium.
    Type: Grant
    Filed: August 7, 1984
    Date of Patent: March 25, 1986
    Assignee: Freeport Minerals Company
    Inventors: Vivian C. Astley, Rudolph R. Milan, Jody J. Taravella
  • Patent number: 4575011
    Abstract: Mine-run lignite having an unsalably high content of ash-producing clay is treated selectively to shatter the more friable portions; the effluent from the shattering operation is classified by size; at least the classification containing the smallest particles is discarded; and particles of size larger than those discarded are combined to produce a mixture of lower ash producing clay content. Preferably, the classified effluent is separated into a first portion containing the larger, salable particles; a second portion containing medium-size particles which contains too much clay to be readily salable with the medium-size particle mixture subjected to further treatment such as jigging or heavy media separation to yield a product of clay content that is salable; and a third portion of smaller size particles which is discarded.
    Type: Grant
    Filed: January 27, 1984
    Date of Patent: March 11, 1986
    Assignee: Phillips Petroleum Company
    Inventor: Roger W. Fenstermaker
  • Patent number: 4572439
    Abstract: Particulate materials such as catalyst or catalyst substrate are slurried and exposed to ultrasonic energy in a rapid attrition treatment.
    Type: Grant
    Filed: November 30, 1983
    Date of Patent: February 25, 1986
    Assignee: Phillips Petroleum Company
    Inventor: Emory W. Pitzer
  • Patent number: 4562969
    Abstract: A process is provided which comprises the steps of:(1) grinding lignocellulosic material to form an aqueous groundwood pulp fiber suspension;(2) screening the groundwood pulp fiber suspension through a coarse screen having screen openings not less that about 5 mm;(3) defibrating lignocellulosic material separated out on the coarse screen;(4) recycling the defibrated lignocellulosic material to the groundwood pulp fiber suspension from the grinding step (1);(5) separating the groundwood pulp fiber suspension from step (2) into (a) an accepts fraction and (b) a rejects fraction, the latter comprising from about 30% up to about 85% by weight of the fiber suspension;(6) screening the rejects fraction 5 (b) of the groundwood pulp fiber suspension through a screen having screen openings of less than about 5 mm;(7) separating the fiber suspension from step (6) into (a) an accepts fraction and (b) a rejects fraction;(8) recycling the rejects fraction 7(b) to the defibrating step (3) and then to the groundwood pulp fi
    Type: Grant
    Filed: March 5, 1984
    Date of Patent: January 7, 1986
    Assignee: Mooch Domsjo Aktiebolag
    Inventor: Jonas A. I. Lindahl
  • Patent number: 4554004
    Abstract: A process for preparing granulated fertilizer materials, wherein urea phosphate is used as a granulating agent to assist in the agglomeration of finely divided solid particles into relatively uniformly sized granules. Urea phosphate, prepared by dissolving urea in phosphoric acid, is coated onto finely divided particles of fertilizer materials, and granulation is accomplished at a temperature within the thermoplastic range of the urea phosphate, wherein the urea phosphate plasticizes and induces adherence of the fine particles into relatively uniformly sized granules. Optionally, ammonia gas, clay, or micro nutrients may be added after granulation.
    Type: Grant
    Filed: October 19, 1983
    Date of Patent: November 19, 1985
    Assignee: J. R. Simplot Company
    Inventors: Laurence W. Bierman, Charles R. Edinborough, David K. Johnson
  • Patent number: 4538765
    Abstract: Waste paper is defiberized within a container or receptacle in a thick stock range at a low water level. Thereafter, by further infeeding water, the obtained slurry or the like is diluted to a consistency of less than 7% while continuing the defiberizing operation. Finally, the obtained stock suspension is withdrawn through a sieve or screen located at the floor of a defiberizing container. The defiberizing container or receptacle used for performing the method possesses a lower region having a smaller diameter, above which there is located an upper region having a larger diameter.
    Type: Grant
    Filed: December 6, 1982
    Date of Patent: September 3, 1985
    Assignee: Escher Wyss GmbH
    Inventors: Hermann Mayr, Albrecht Kahmann, Gerhard Lambrecht, Wolfgang Heinbockel, Wolfgang Siewert, Josef Maier
  • Patent number: 4535941
    Abstract: A pellet feeder (A) feeds pellets of vulcanized rubber or other materials and water or another fluid at controlled rates into a mixing tank (30). An agitator (32) mixes the pellets and fluid into a slurry. The slurry is pumped from the mixing tank to a mill (C) by a pump (34). The mill has a receiving region (70) defined between a stator (48) and a rotor (68) for receiving the slurry. The stator and rotor define a peripheral grinding zone (72) around the slurry receiving region. An impeller (74) has vanes which extend from the upper surface of the rotor to an abrasive surface (82) of the stator such that the impeller vanes are ground at the same rate as the stator and rotor wear to maintain a fluid seal around the impeller blades. Fluid cylinders (50, 52) maintain a constant pressure between the stator and rotor. The stator has a plurality of recesses (86, 86') which preferably have downstream extending relief areas (214).
    Type: Grant
    Filed: July 3, 1984
    Date of Patent: August 20, 1985
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Ronald L. Brubaker, James J. Tloczysnki, Melvin Budzol, Clifford J. Ahola, Frederick P. Boyle, Truman D. Parkinson, James C. Rine
  • Patent number: 4533085
    Abstract: A method for synthesizing Ziram in a flowable water based suspension by reacting chemical starting materials in liquid components required for a final stable suspension of the resulting pesticide. The method applies to production of Ziram suspensions for pesticidal applications.
    Type: Grant
    Filed: July 29, 1983
    Date of Patent: August 6, 1985
    Inventors: Jay A. Woods, Verle W. Woods, Dale G. Woods
  • Patent number: 4533086
    Abstract: Disclosed is a process for grinding graphite comprising:(1) forming a mixture of graphite and a graphite grinding aid;(2) grinding the mixture of graphite and graphite grinding aid to reduce the size of the graphite;(3) forming an aqueous slurry of the graphite particles, graphite grinding aid and water;(4) adding an amount of hydrocarbon oil to the aqueous slurry with agitation to form graphite-oil agglomerates;(5) separating the graphite-oil agglomerates from the grinding aid and water; and(6) removing hydrocarbon oil from the graphite-oil agglomerates to provide graphite particles reduced in size.
    Type: Grant
    Filed: December 27, 1982
    Date of Patent: August 6, 1985
    Assignee: Atlantic Richfield Company
    Inventor: Jack D. Junttila
  • Patent number: 4533084
    Abstract: This invention is a process for comminuting run-of-mine crushed coal by contacting the coal with an aqueous methanol solution for a time sufficient to comminute a substantial portion of the coal to a predetermined particle size. Another aspect of this invention is a process for slurry mining coal which comprises contacting the coal in-situ with an aqueous methanol solution for a time sufficient to comminute a portion of the coal and to form a slurry, and then conveying the slurry to a receiving vessel where the comminuted coal is recovered. Still another aspect of this invention, is to transport the comminuted coal having a desired particle size in slurry form using an aqueous methanol solution as the slurry medium wherein there is further comminution of the coal to improve its burning characteristics.
    Type: Grant
    Filed: April 15, 1983
    Date of Patent: August 6, 1985
    Assignee: Mobil Oil Corporation
    Inventors: Ju-Nam Chew, Joseph G. Savins
  • Patent number: 4529133
    Abstract: A process which comprises passing soft limerock through a primary crusher, adding water to the crushed rock, passing the crushed rock and water through a series of screens with successively smaller screen openings while adding additional water to each screen, collecting the rock not passing through the screens and passing a portion of it through a secondary crusher and recycling the product to the series screens, collecting the rock passing through all screens and causing it to pass through a screw conveyor with a large excess of water and collecting fine particles of crushed soft limerock from the screw conveyor for use in preparing asphalt road paving material.
    Type: Grant
    Filed: April 1, 1983
    Date of Patent: July 16, 1985
    Assignee: Anderson Mining Corporation
    Inventor: Rolfe E. Wall
  • Patent number: 4529132
    Abstract: The invention relates to the preparation of free-flowing homopolymer and copolymer waxes by heating the solid or molten waxes in aqueous ammonia solution.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: July 16, 1985
    Assignee: Ruhrchemie Aktiengesellschaft
    Inventors: John Hobes, Detlef Deymann
  • Patent number: 4506835
    Abstract: There is provided a process for the beneficiation of oil shale comprising comminuting oil shale to a maximum particle size that maximizes the separation efficiency index of a physical separation method at a predetermined product yield. The oil shale particles are then separated into organic-rich product and organic-lean refuse by the physical separation methods in which the product yield is adjusted to maximize the separation efficiency index of the separation. Preferred physical separation methods include gravity separation, hydraulic separation by tabling, froth flotation and oil agglomeration.
    Type: Grant
    Filed: June 7, 1982
    Date of Patent: March 26, 1985
    Assignee: Occidental Research Corp.
    Inventor: Shirley C. Tsai
  • Patent number: 4500041
    Abstract: High concentrated coal-water slurry is produced by coarsely crushing coal, thereafter pulverizing the coarsely crushed coal, together with water and a slurry dispersant, according to necessity, in a wet-type ball mill, and feeding back one portion of the finely pulverized coal slurry thus obtained into the inlet of the wet-type ball mill.
    Type: Grant
    Filed: December 3, 1982
    Date of Patent: February 19, 1985
    Assignees: Lion Corporation, Kao Corporation, Mitsui Engineering and Shipbuilding Company Limited, Electric Power Development Company Limited, Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Kazuhiko Nakaoji, Mitsugu Kamao, Hayami Itoh, Shuhei Tatsumi, Shoichi Takao
  • Patent number: 4485077
    Abstract: A method and system for conducting wet grinding of mined phosphate rock before utilizing the same for the production of phosphoric acid by the wet process method, the method comprising the steps of: (1) wet grinding the phosphate rock in a medium of fresh water at a first stage so as to form a fresh water slurry comprising ground rock and fresh water, (2) sending the fresh water slurry from the first stage to a second stage, (3) dewatering the fresh water slurry at the second stage so as to recover most of the fresh water from the slurry and leave substantially only wet ground rock, (4) recycling the fresh water recovered at the second stage back to the first stage for use in further wet grinding, (5) sending the ground rock from the second stage to a third stage, (6) refluidizing the ground rock at the third stage with acidic pond water so as to form a pond water slurry comprising ground rock and pond water, and (7) thereafter passing the pond water slurry on to a reactor for standard processing so as to pro
    Type: Grant
    Filed: August 12, 1983
    Date of Patent: November 27, 1984
    Assignee: The Badger Company, Inc.
    Inventor: John L. Martinez
  • Patent number: 4481015
    Abstract: The present invention relates to a method for producing pumpable coal-water suspensions by grinding pre-comminuted coal with water in a packed column in a ratio corresponding to the composition of the suspension ready for use. The addition of water or coal is controlled by measuring the density of the suspension leaving the mill, and the grain size of the coal particles is controlled by measuring the viscosity of the suspension. The density and viscosity of the coal-water suspension are simultaneously mutually adjusted. The addition of additives to the water is regulated according to the amount of coal added to the mill. The coal-water suspension can be fed to a coal gasification reactor without substantially changing the relative amounts of coal and water in said suspension.
    Type: Grant
    Filed: May 28, 1982
    Date of Patent: November 6, 1984
    Assignee: Ruhrchemie Aktiengesellschaft
    Inventors: Jurgen Lusch, Bernhard Lieder, Heinrich Heinen, Wolfgang Kolodzey
  • Patent number: 4472241
    Abstract: An aqueous slurry of 0.2 to 2.0 weight percent aramid fibrids and aramid floc in a weight ratio of 0.25 to 20, respectively, is refined in a disc refiner having grooved facing plates with surface dams, the distance between the facing plates being 0.20 to 1.0 mm.
    Type: Grant
    Filed: June 15, 1983
    Date of Patent: September 18, 1984
    Assignee: E. I. Du Pont De Nemours and Company
    Inventor: Richard L. Provost
  • Patent number: 4469280
    Abstract: A method for heating agglomerating slurries in association with a method and apparatus for heating such slurries to supercritical conditions by electrical resistance. A feed slurry and a dilution stream are passed in admixture to a heating zone, and heated. A portion of the heated admixture is separated to provide the dilution stream, which is substantially free of agglomerating solids, to lower agglomeration in the heating zone. Preferably, the solid particles of the dilution stream are comminuted between separation of the dilution stream and before admixture with the feed slurry.
    Type: Grant
    Filed: July 2, 1982
    Date of Patent: September 4, 1984
    Assignee: CNG Research Company
    Inventors: Lester G. Massey, Robert I. Brabets, David A. George, William A. Abel
  • Patent number: 4458845
    Abstract: A process for defibrilating or pulping used corrugated waste paper and all fibrous paper and pulp products. The process utilizes a soaking step wherein the corrugated waste paper is soaked. The soaked paper is conveyed to the interior of a perforated rotating drum where it is sprayed with high pressure water and broken down to fibers which may be reprocessed to make new paper and other materials.
    Type: Grant
    Filed: July 16, 1982
    Date of Patent: July 10, 1984
    Inventors: James A. Marcalus, Thomas S. Jordan
  • Patent number: 4434942
    Abstract: This invention provides a process and apparatus for the wet attrition of ore. The process comprises grinding the ore to a pulp having a particle size distribution such that about 80% by weight of the particles have a diameter of from about 30 to about 0.4 mm; and agitating the pulp in a slightly turbulent medium. The apparatus comprises a vat having top and bottom covers with central openings and a gutter disposed along the exterior circumference of the top of the vat; a cylindrical shaft extending through the opening in the top cover; and a pair of impellers mounted at a distance apart on the shaft, the blades of the impellers being so arranged that the pulp is pumped towards the space defined between the two impellers.
    Type: Grant
    Filed: December 23, 1981
    Date of Patent: March 6, 1984
    Assignee: Societe Metallurgique Le Nickels-S.L.N.
    Inventor: Jean-Louis Cardini
  • Patent number: 4433813
    Abstract: A method of forming wood fibres for use in the production of a riding surface comprises feeding wood chips having a length, in the grain direction, of from 18 mm to 35 mm, to a milling machine adjusted to break the wood chips into wood fibres, the lengths of the fibres produced by the milling machine being substantially in accordance with the following percentages, by volume, of the total volume:______________________________________ Wood fibre length Percentage of Total Fibre ______________________________________ 0 mm-5 mm 10%-20% 5 mm-15 mm 40%-55% 15 mm-35 mm 35%-50% ______________________________________It is found that a surface formed from a compacted layer, several inches deep, of fibres produced by the above method has excellent characteristics for horse riding and these characteristics are not unduly affected by variations in weather conditions.
    Type: Grant
    Filed: August 5, 1980
    Date of Patent: February 28, 1984
    Inventors: Rodney Whatton, Timothy W. Gilder
  • Patent number: 4432498
    Abstract: Method and apparatus for hydraulically disposing of animal waste utilizing a water container in which the waste is stored temporarily. Duct work supported in the container is connected to a pressurized water source effective to aspirate water and waste into a submerged inlet and conducting it to a place of waste disposal. A jet of pressurized water aids in comminuting the waste, circulating the same past the waste inlet, and in flushing away larger elements tending to obstruct the inlet.
    Type: Grant
    Filed: July 16, 1979
    Date of Patent: February 21, 1984
    Inventor: Aynon L. Clements
  • Patent number: 4428534
    Abstract: A method of improving the utilization of the heat energy produced in a wood grinding process when wood is ground in a grinding space (3) under a pressure exceeding atmospheric pressure, and warm shower water (G) is sprayed into the grinding space. Steam (H) is separated from the groundwood pulp (A) discharged from the grinding space in a steam separator wherein the groundwood pulp is allowed to expand from its inlet pressure to atmospheric pressure in at least two steam separators (11,14) by releasing steam from the groundwood pump in each steam separator by decreasing the pulp pressure. The amount of steam (H1,H2) released in the separate steam separators is adjusted according to the proportions in which steam is needed for utilizations purposes. Thus the heat energy of the pressure grinding process can be recovered in separate steam fractions the amount and pressure of which correspond to the requirements of the utilization purposes.
    Type: Grant
    Filed: November 2, 1981
    Date of Patent: January 31, 1984
    Assignee: Oy Tampella AB
    Inventors: Ari A. M. Maijala, Matti I. Aario
  • Patent number: 4427451
    Abstract: A process for preparing concentrated slurries of TiO.sub.2 and water with a solids content of 30-70% by weight from TiO.sub.2 micronizer tailings that are carried in steam separated from TiO.sub.2 and steam from a micronizer by scrubbing the steam and TiO.sub.2 micronizer tailings with a slurry of TiO.sub.2 and water, separating TiO.sub.2 and water from the steam and circulating a portion of the TiO.sub.2 and water to the absorber until the solids content desired is reached.
    Type: Grant
    Filed: September 17, 1981
    Date of Patent: January 24, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Michael R. Baloga
  • Patent number: 4426042
    Abstract: An improved method of shredding municipal solid waste or garbage including the steps of introducing the solid waste into a tumbling mill having a diameter to length ratio of about 2.5:1 to 3:1, maintaining a negative pressure within the tumbling mill and maintaining a sufficient moisture content in solid waste. Shredding is accomplished by contacting the waste with irregular shaped grinding media within the tumbling mill.
    Type: Grant
    Filed: October 16, 1980
    Date of Patent: January 17, 1984
    Assignee: Mineral Processing Systems, Inc.
    Inventor: Eugene E. Hively
  • Patent number: 4399946
    Abstract: A method and apparatus for forming a cement or plaster slurry, for example, for use in mines, in which bags of cement or plaster are fed into a substantially closed chamber, are ruptured, and water is fed into the chamber at a controlled rate. The resulting mixture is fed into a macerator which serves to comminute the bag material and to mix the cement or plaster which is then fed into a pump, preferably a positive displacement pump, such as a helical gear pump and is thus pumped on to the point of use.
    Type: Grant
    Filed: January 15, 1981
    Date of Patent: August 23, 1983
    Assignee: Mono Oakes Limited
    Inventor: Christopher Stevenson
  • Patent number: 4394977
    Abstract: A method for improving the utilization of the heat energy produced in a wood grinding process, wherein wood is ground in a grinding space (3) under a pressure exceeding atmospheric pressure, and warm shower water (G) is sprayed into the grinding space. The groundwood pulp (A) is fed from the grinding space into a steam separator (11), wherein the heat energy contained in the groundwood pulp is released in the form of steam (H), and replacement water (E) is brought into the process for the compensation of shower water losses. The steam separator is kept pressurized in order to recover the steam (H) released from the groundwood pulp under a greater pressure and at a higher temperature than in an atmospheric steam separator.
    Type: Grant
    Filed: November 4, 1981
    Date of Patent: July 26, 1983
    Assignee: Oy Tampella AB
    Inventor: Ari A. M. Maijala
  • Patent number: 4394498
    Abstract: A method is provided for the production of a powder comprised of particulates of a liquid crystal polymer. The powders of such polymers are uniquely suited for use in temperature and chemical resistant coatings. The particulates are formed by providing foamed articles of liquid crystal polymers and subsequently masticating the articles to form the desired particulates.
    Type: Grant
    Filed: August 24, 1981
    Date of Patent: July 19, 1983
    Assignee: Celanese Corporation
    Inventor: John R. Kastelic
  • Patent number: 4365761
    Abstract: A vortical circulation type pulper has a bladed and channelled rotor and an annular bladed and channeled stator mounted in a side, or bottom, wall, the rotor and annular stator forming a truncated conical attrition interface with the small end receiving stock for passage through the interface to the large end and thence for discharge or recirculation. Rotor/stator clearance at rest, is about 15/1000 of an inch. The stator is provided with an annular, pattern of alternate, triangular acquisition valleys and bladed and channeled peaks, each peak having an acquisition edge in the path of the stock reduction, edges of the rotor vanes so that the stock is reduced by the scissors-like contact of stock reduction edges of the vanes with the acquisition edges of the stator peaks in a stock reduction interface until sufficiently defibered to enter the truncated conical, bladed and channeled rotor/stator attrition interface for further treatment and recirculation or discharge.
    Type: Grant
    Filed: March 6, 1980
    Date of Patent: December 28, 1982
    Assignee: Bolton - Emerson, Inc.
    Inventor: Donald W. Danforth
  • Patent number: 4363449
    Abstract: A process is disclosed for reclaiming a jelly-filled telecommunication cable. The process comprises the steps of cutting the cable into segments of jelly bearing insulated wires and forming the segments into a slurry heated to a temperature sufficient to soften the jelly. The slurry is milled thereby liberating insulation from the wires with a substantial portion of the softened jelly adhering to the liberated insulation. The jelly-bearing liberated insulation is then separated from the wires.
    Type: Grant
    Filed: January 5, 1981
    Date of Patent: December 14, 1982
    Assignees: Western Electric Co., Inc., Nassau Recycle Corporation
    Inventors: Susan H. Carr, Monique A. Schobert, John J. Taylor