Liquids Added To Make Pulp Or Suspension Patents (Class 241/21)
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Patent number: 4643361Abstract: 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: GrantFiled: October 17, 1984Date of Patent: February 17, 1987Inventor: Terrence R. Chapman
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Patent number: 4643363Abstract: 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: GrantFiled: June 4, 1981Date of Patent: February 17, 1987Assignee: GTE Products CorporationInventor: Robert A. Long
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Patent number: 4635859Abstract: 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: GrantFiled: May 29, 1985Date of Patent: January 13, 1987Assignee: AMCA International LimitedInventor: Allan J. Wildey
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Patent number: 4629130Abstract: 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: GrantFiled: November 2, 1983Date of Patent: December 16, 1986Assignee: A/S Niro AtomizerInventor: Preston L. Veltman
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Patent number: 4625922Abstract: 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: GrantFiled: January 4, 1985Date of Patent: December 2, 1986Assignee: The Goodyear Tire & Rubber CompanyInventors: Ronald L. Brubaker, Robert Calevich
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Patent number: 4624417Abstract: 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: GrantFiled: June 11, 1984Date of Patent: November 25, 1986Assignee: Newest, Inc.Inventor: Alfred J. Gangi
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Patent number: 4621773Abstract: 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: GrantFiled: November 21, 1984Date of Patent: November 11, 1986Assignee: The Goodyear Tire & Rubber CompanyInventors: Robert Calevich, George V. Chinchar
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Patent number: 4620672Abstract: 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: GrantFiled: February 4, 1985Date of Patent: November 4, 1986Assignee: Bechtel International CorporationInventors: Irving Leibson, Horst Huettenhain
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Patent number: 4620671Abstract: 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: GrantFiled: May 29, 1984Date of Patent: November 4, 1986Assignee: J. M. Voith GmbHInventor: Thomas F. Skaar
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Patent number: 4613084Abstract: 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: GrantFiled: June 27, 1984Date of Patent: September 23, 1986Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Shigehito Takamoto, Kazunori Shoji, Nobuyasu Meguri, Yoshinori Ohtani, Hirofumi Kikkawa, Yasuyuki Nishimura, Hiroyuki Kaku, Masayasu Murata
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Patent number: 4606503Abstract: 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: GrantFiled: December 13, 1983Date of Patent: August 19, 1986Assignee: Columbia River CarbonatesInventor: Joerg A. Bleeck
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Patent number: 4598873Abstract: 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: GrantFiled: June 1, 1983Date of Patent: July 8, 1986Assignee: F. L. Smidth & Co. A/SInventor: Jorgen Cleemann
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Patent number: 4593859Abstract: 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: GrantFiled: May 17, 1984Date of Patent: June 10, 1986Assignees: 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
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Patent number: 4591103Abstract: 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: GrantFiled: January 25, 1984Date of Patent: May 27, 1986Assignees: ICI Australia Limited, Woods Reef Mines Ltd.Inventors: John R. Andrews, Philip S. B. Stewart, George T. Hurst
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Patent number: 4588134Abstract: 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: GrantFiled: July 18, 1984Date of Patent: May 13, 1986Assignee: Saitama Bee-Keeping Co., Ltd.Inventors: Shinichi Shimizu, Tetuo Rikiishi, Yasuo Koyama
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Patent number: 4585547Abstract: 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: GrantFiled: September 14, 1984Date of Patent: April 29, 1986Inventor: G. W. Nicholson
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Patent number: 4582261Abstract: 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: GrantFiled: May 18, 1984Date of Patent: April 15, 1986Assignee: AdamationInventor: Kenneth E. Perry
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Patent number: 4579563Abstract: 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: GrantFiled: April 15, 1985Date of Patent: April 1, 1986Inventors: Kenneth D. Burnside, Daniel C. Deer, III
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Patent number: 4578148Abstract: 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: GrantFiled: November 1, 1984Date of Patent: March 25, 1986Assignee: Mo och Domsjo AktiebolagInventor: Jonas A. I. Lindahl
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Patent number: 4578147Abstract: 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: GrantFiled: March 1, 1983Date of Patent: March 25, 1986Assignee: Mo och Domsjo AktiebolagInventors: Jonas A. I. Lindahl, Gustaf E. Johnsson
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Patent number: 4577804Abstract: 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: GrantFiled: August 7, 1984Date of Patent: March 25, 1986Assignee: Freeport Minerals CompanyInventors: Vivian C. Astley, Rudolph R. Milan, Jody J. Taravella
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Patent number: 4575011Abstract: 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: GrantFiled: January 27, 1984Date of Patent: March 11, 1986Assignee: Phillips Petroleum CompanyInventor: Roger W. Fenstermaker
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Patent number: 4572439Abstract: Particulate materials such as catalyst or catalyst substrate are slurried and exposed to ultrasonic energy in a rapid attrition treatment.Type: GrantFiled: November 30, 1983Date of Patent: February 25, 1986Assignee: Phillips Petroleum CompanyInventor: Emory W. Pitzer
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Patent number: 4562969Abstract: 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 fiType: GrantFiled: March 5, 1984Date of Patent: January 7, 1986Assignee: Mooch Domsjo AktiebolagInventor: Jonas A. I. Lindahl
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Patent number: 4554004Abstract: 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: GrantFiled: October 19, 1983Date of Patent: November 19, 1985Assignee: J. R. Simplot CompanyInventors: Laurence W. Bierman, Charles R. Edinborough, David K. Johnson
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Patent number: 4538765Abstract: 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: GrantFiled: December 6, 1982Date of Patent: September 3, 1985Assignee: Escher Wyss GmbHInventors: Hermann Mayr, Albrecht Kahmann, Gerhard Lambrecht, Wolfgang Heinbockel, Wolfgang Siewert, Josef Maier
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Patent number: 4535941Abstract: 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: GrantFiled: July 3, 1984Date of Patent: August 20, 1985Assignee: The Goodyear Tire & Rubber CompanyInventors: Ronald L. Brubaker, James J. Tloczysnki, Melvin Budzol, Clifford J. Ahola, Frederick P. Boyle, Truman D. Parkinson, James C. Rine
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Patent number: 4533085Abstract: 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: GrantFiled: July 29, 1983Date of Patent: August 6, 1985Inventors: Jay A. Woods, Verle W. Woods, Dale G. Woods
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Patent number: 4533086Abstract: 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: GrantFiled: December 27, 1982Date of Patent: August 6, 1985Assignee: Atlantic Richfield CompanyInventor: Jack D. Junttila
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Patent number: 4533084Abstract: 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: GrantFiled: April 15, 1983Date of Patent: August 6, 1985Assignee: Mobil Oil CorporationInventors: Ju-Nam Chew, Joseph G. Savins
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Patent number: 4529133Abstract: 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: GrantFiled: April 1, 1983Date of Patent: July 16, 1985Assignee: Anderson Mining CorporationInventor: Rolfe E. Wall
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Patent number: 4529132Abstract: 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: GrantFiled: September 29, 1982Date of Patent: July 16, 1985Assignee: Ruhrchemie AktiengesellschaftInventors: John Hobes, Detlef Deymann
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Patent number: 4506835Abstract: 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: GrantFiled: June 7, 1982Date of Patent: March 26, 1985Assignee: Occidental Research Corp.Inventor: Shirley C. Tsai
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Patent number: 4500041Abstract: 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: GrantFiled: December 3, 1982Date of Patent: February 19, 1985Assignees: Lion Corporation, Kao Corporation, Mitsui Engineering and Shipbuilding Company Limited, Electric Power Development Company Limited, Kawasaki Jukogyo Kabushiki KaishaInventors: Kazuhiko Nakaoji, Mitsugu Kamao, Hayami Itoh, Shuhei Tatsumi, Shoichi Takao
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Patent number: 4485077Abstract: 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 proType: GrantFiled: August 12, 1983Date of Patent: November 27, 1984Assignee: The Badger Company, Inc.Inventor: John L. Martinez
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Patent number: 4481015Abstract: 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: GrantFiled: May 28, 1982Date of Patent: November 6, 1984Assignee: Ruhrchemie AktiengesellschaftInventors: Jurgen Lusch, Bernhard Lieder, Heinrich Heinen, Wolfgang Kolodzey
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Patent number: 4472241Abstract: 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: GrantFiled: June 15, 1983Date of Patent: September 18, 1984Assignee: E. I. Du Pont De Nemours and CompanyInventor: Richard L. Provost
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Patent number: 4469280Abstract: 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: GrantFiled: July 2, 1982Date of Patent: September 4, 1984Assignee: CNG Research CompanyInventors: Lester G. Massey, Robert I. Brabets, David A. George, William A. Abel
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Patent number: 4458845Abstract: 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: GrantFiled: July 16, 1982Date of Patent: July 10, 1984Inventors: James A. Marcalus, Thomas S. Jordan
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Patent number: 4434942Abstract: 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: GrantFiled: December 23, 1981Date of Patent: March 6, 1984Assignee: Societe Metallurgique Le Nickels-S.L.N.Inventor: Jean-Louis Cardini
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Patent number: 4433813Abstract: 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: GrantFiled: August 5, 1980Date of Patent: February 28, 1984Inventors: Rodney Whatton, Timothy W. Gilder
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Patent number: 4432498Abstract: 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: GrantFiled: July 16, 1979Date of Patent: February 21, 1984Inventor: Aynon L. Clements
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Patent number: 4428534Abstract: 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: GrantFiled: November 2, 1981Date of Patent: January 31, 1984Assignee: Oy Tampella ABInventors: Ari A. M. Maijala, Matti I. Aario
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Patent number: 4427451Abstract: 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: GrantFiled: September 17, 1981Date of Patent: January 24, 1984Assignee: E. I. Du Pont de Nemours and CompanyInventor: Michael R. Baloga
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Patent number: 4426042Abstract: 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: GrantFiled: October 16, 1980Date of Patent: January 17, 1984Assignee: Mineral Processing Systems, Inc.Inventor: Eugene E. Hively
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Patent number: 4399946Abstract: 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: GrantFiled: January 15, 1981Date of Patent: August 23, 1983Assignee: Mono Oakes LimitedInventor: Christopher Stevenson
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Patent number: 4394977Abstract: 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: GrantFiled: November 4, 1981Date of Patent: July 26, 1983Assignee: Oy Tampella ABInventor: Ari A. M. Maijala
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Patent number: 4394498Abstract: 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: GrantFiled: August 24, 1981Date of Patent: July 19, 1983Assignee: Celanese CorporationInventor: John R. Kastelic
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Patent number: 4365761Abstract: 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: GrantFiled: March 6, 1980Date of Patent: December 28, 1982Assignee: Bolton - Emerson, Inc.Inventor: Donald W. Danforth
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Patent number: 4363449Abstract: 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: GrantFiled: January 5, 1981Date of Patent: December 14, 1982Assignees: Western Electric Co., Inc., Nassau Recycle CorporationInventors: Susan H. Carr, Monique A. Schobert, John J. Taylor