Patents Assigned to Falconbridge Limited
  • Patent number: 7318914
    Abstract: A method is provided for the removal of chromium from leach liquors produced during high pressure leaching of laterite ores in an autoclave, by addition to the autoclave of carbon in a quantity of about 0.5%-1% by weight with reference to the total dry feed.
    Type: Grant
    Filed: December 16, 2002
    Date of Patent: January 15, 2008
    Assignee: Falconbridge Limited
    Inventors: Mohamed Buarzaiga, Debbie Marshall, Marc Boissoneault, Maxine Hoffman, Carlton A. Potter
  • Patent number: 7306706
    Abstract: A method and apparatus for stripping electro-deposited metal sheets from a cathode blank. The blank has opposite faces, upstream and downstream ends. At least one sheet is provided on at least one blank face to define upstream and downstream edges. The apparatus comprises a stripping assembly for stripping the electro-deposited metal sheets from the cathode blank, a discharge assembly and a metal sheet out-feed assembly. The discharge assembly is positioned downstream of the stripping assembly and includes opposite guide rollers adapted to engage the metal sheet exiting the stripping assembly. The metal sheet out-feed assembly is positioned downstream the discharge assembly for receiving the metal sheet. When the metal sheet has been stripped from the cathode blank, the guide rollers controllably feed the metal sheet to the out-feed assembly. The method comprises stripping the metal sheets from the cathode and controllably discharging the stripped sheets to an out-feed assembly.
    Type: Grant
    Filed: January 21, 2004
    Date of Patent: December 11, 2007
    Assignee: Falconbridge Limited
    Inventors: Victor Robinson, Philip Donaldson
  • Patent number: 7285193
    Abstract: A cathode for use in the refining or winning of metals, typically used in the electro-refining or winning of copper, comprising a substantially flat deposition plate fixedly attached along an upper edge thereof to an elongate hanger bar thereby defining a connection. A protective cladding is attached to the deposition plate and at least partially surrounding the hanger bar such that a cavity is defined in the region of the connection. A corrosion resistant material fills the cavity. In this manner the corrosion resistant material prevents corrosive substances from penetrating the connection. The corrosion resistant material prevents corrosive electrolytic solution and other liquids from corroding the conductive connection between the deposition plate and the hanger bar which would otherwise reduce efficiency of the cathode.
    Type: Grant
    Filed: June 17, 2003
    Date of Patent: October 23, 2007
    Assignee: Falconbridge Limited
    Inventors: Victor Robinson, James Joseph Detulleo, Gordon S. Iverson, Ian J. Beales
  • Publication number: 20070034053
    Abstract: Active nickel powder is produced by reducing a feed material, containing one or more reducible nickel salts, such that when nickel chloride is present, the weight ratio of chloride to total nickel is greater than 0.1 and the reducible nickel salts have a surface area in excess of 1 m2/g, with a reducing gas containing preferably at least 20 volume per cent hydrogen, at a temperature preferably between 300° C. and 600° C., and when nickel chloride is not present, by adding hydrogen chloride directly to the reducing gas. The resulting active nickel powder can be rapidly converted into nickel carbonyl by reaction with a gas containing carbon monoxide preferably at atmospheric or super-atmospheric pressure, in the absence of conventional carbonylation catalysts.
    Type: Application
    Filed: April 27, 2004
    Publication date: February 15, 2007
    Applicant: Falconbridge Limited
    Inventors: Michael Collins, Sandra Kuula
  • Patent number: 7014036
    Abstract: The present invention provides a linear conveyer assembly for cathode plates comprising a continuous timing belt provided with cathode plate conveying assemblies attached thereto and having cam rollers running in a pair of channels running along either side of and parallel to a forward path of the belt. The conveying assemblies insure that the cathode plate conveying assemblies are aligned in an overhead position in such a way that the cathode plates move in a direction substantially perpendicular to a surface thereof. The timing belt is fabricated from a corrosive resistant material and allows an accurate positioning of the cathode plates due to a non-permanent stretch character thereof.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: March 21, 2006
    Assignee: Falconbridge Limited
    Inventors: Victor Robinson, Ronald Vandenburg, Philip Donaldson
  • Publication number: 20040099505
    Abstract: The present invention provides a linear conveyer assembly for cathode plates comprising a continuous timing belt provided with cathode plate conveying assemblies attached thereto and having cam rollers running in a pair of channels running along either side of and parallel to a forward path of the belt. The conveying assemblies insure that the cathode plate conveying assemblies are aligned in an overhead position in such a way that the cathode plates move in a direction substantially perpendicular to a surface thereof. The timing belt is fabricated from a corrosive resistant material and allows an accurate positioning of the cathode plates due to a non-permanent stretch character thereof.
    Type: Application
    Filed: November 27, 2002
    Publication date: May 27, 2004
    Applicant: FALCONBRIDGE LIMITED
    Inventors: Victor Robinson, Ronald Vandenburg, Philip Donaldson
  • Patent number: 6379426
    Abstract: The present invention is concerned with a method for the pre-reduction of laterite fines in a reactor, preferably a fluidized bed, with reducing gases generated in situ by adding a reducing agent such as a carbonaceous material in the fluidized bed chamber, fluidizing the bed with an oxidizing gas and maintaining the reactor at a temperature sufficiently high to partially combust the coal and generate a reducing atmosphere. The reactor bed discharge calcine product has a carbon content of about 0.1%, and the composite reactor product has a carbon content lower than 2.0%.
    Type: Grant
    Filed: September 8, 2000
    Date of Patent: April 30, 2002
    Assignee: Falconbridge Limited
    Inventors: Ron Shonewille, Gary Kaiura, Terrence Koehler
  • Patent number: 6004069
    Abstract: A method for providing a composite capping cover for maintaining the surface of a sulphide bearing tailing and mine waste containing deposit moist thereby substantially eliminating oxidation of the sulphidic particulate in the deposit and the formation of heavy metal salts. The moisture is provided by atmospheric precipitation. The composite capping cover comprises a fine particulate layer, a fine-granular particulate layer and a coarse-granular particulate layer, the particle sizes of the particles making up the individual the layers having been selected such that the hydraulic conductivity of the layers increases with successive layers while the matric suction value within the layers decreases.
    Type: Grant
    Filed: May 29, 1997
    Date of Patent: December 21, 1999
    Assignee: Falconbridge Limited
    Inventor: Michael P. Sudbury
  • Patent number: 5795466
    Abstract: A multi-stage froth flotation process is provided for concentrating sulphide minerals or middlings containing non-ferrous metal values such as nickel, cobalt and copper, which co-exist with significant amounts of pyrrhotite. The process is carried out without relying on any specific reagent as pyrrhotite depressant, but rather by exploiting the natural pulp environment with low REDOX potentials generated by mild steel grinding media in the grinding step preceding the froth flotation. The concentrate from the flotation stage(s) in which the REDOX potential rises above a predetermined value, is recycled back to the grinding step and/or to preceding flotation stage(s) from which concentrate is collected as the final product or is subjected to an up-grading in a further cleaning stage.
    Type: Grant
    Filed: May 27, 1997
    Date of Patent: August 18, 1998
    Assignee: Falconbridge Limited
    Inventors: Sadan Kelebek, Peter F. Wells, Simon O. Fekete, Michael J. Burrows, Daniel F. Suarez
  • Patent number: 5693692
    Abstract: A new depressant for use in enhanced separation of polymetallic sulphides is described. The depressant agent is used in conjunction with conventional collector agents and frothing agents in the flotation separation of copper, nickel, lead, zinc sulphides by depressing iron sulphides such as pyrrhotite, pyrite and marcasite in the tailing. The depressant consists of a chemically-modified carbohydrate polymer, a polyacrylate and low foaming lignin sulphonate.
    Type: Grant
    Filed: May 9, 1994
    Date of Patent: December 2, 1997
    Assignees: Huntsman Petrochemical Corp., Falconbridge Limited
    Inventors: Srdjan Bulatovic, Tim M. Jessup, James F. Jackson, Gordon Leighton
  • Patent number: 5240496
    Abstract: A process for pretreating chromium-bearing metal scrap comprises charging the chromium-bearing metal scrap with fayalite slag into a pyrometallurgical furnace, heating and melting the charge, and maintaining the charge molten at a temperature of at least 1550.degree. C. for a predetermined time period to allow an iron oxide/chromium exchange reaction to take place oxidizing and removing chromium to the slag phase while reducing iron to the metal phase to form an alloy product containing Fe along with the Ni and/or Co, and removing the alloy product for further processing for recovery of metal values.
    Type: Grant
    Filed: October 7, 1992
    Date of Patent: August 31, 1993
    Assignee: Falconbridge Limited
    Inventors: Gary J. O'Connell, David G. Tisdale
  • Patent number: 5238579
    Abstract: A method is proposed for performing precipitation reactions which yields precipitate particles in the form of flakes. The precipitate particles are coarse, having cross-measurements in the order of 10 to 400 microns. According to this method, a suitable precipitant is one which will react with the ionic species to be precipitated and which is sparingly soluble, such as lime, and therefore capable of forming a slurry as opposed to a solution. Prior to adding the precipitant to the solution containing ions to be precipitated, the precipitant is slurried, normally in aqueous medium, and flocculated such that discrete floccules having diameters in the order of 1 to 6 mm are formed. Upon addition of the flocculated precipitant to the solution containing ions to be precipitated, a layer of precipitate forms on the surface of the precipitant floccules, encapsulating or partially encapsulating the floccule.
    Type: Grant
    Filed: November 30, 1992
    Date of Patent: August 24, 1993
    Assignees: Falconbridge Limited, Paul Shibley and Associates, Ltd.
    Inventor: Paul W. M. Shibley
  • Patent number: 5149410
    Abstract: A method and apparatus for stripping electrodeposited metal sheets from permanent cathodes comprising a rotating carousel for receiving and sequentially advancing suspended permanent cathodes having electrodeposited metal sheets to a plurality of stations about the carousel including a loading station, a hammering station for loosening the upper edges of the metal sheets from the cathodes, an opening station for stripping of the metal sheets from the cathodes, a discharge station for discharge of pairs of metal sheets, and an unloading station for removal of stripped cathodes. The pairs of stripped metal sheets preferably are bottom discharged to a vertical envelope which is rotated to a horizontal position for removal of the metal sheets. Also, preferably, every second set of a pair of metal sheets is corrugated and alternate sets of planar and corrugated metal sheets are stacked to a predetermined height and bundled to form a novel bundle of metal sheets most suitable for melting.
    Type: Grant
    Filed: October 16, 1990
    Date of Patent: September 22, 1992
    Assignee: Falconbridge Limited
    Inventors: Victor E. Robinson, Stein Kristoffersen, Joseph Laezza
  • Patent number: 5147528
    Abstract: A process for the froth flotation separation of phosphate containing minerals by the use of a new collector agent is described. The new phosphate collector agent is prepared by mixing a fatty acid, tall oil pitch, an amine, and optionally sarcosine with fuel or furnace oil, and subsequently oxidizing the mixture by known methods. The new phosphate collector agent is added to the conditioned slurry of the ground and deslimed phosphate containing ore. The slurry is then subjected to froth flotastion in one or more stages to collect the phosphate concentrate in the froth. The phosphate collector agent is also effective in recovering phosphates from slime.
    Type: Grant
    Filed: April 8, 1991
    Date of Patent: September 15, 1992
    Assignee: Falconbridge Limited
    Inventor: Srdjan Bulatovic
  • Patent number: 5049612
    Abstract: A new depressant for use in enhanced separation of polymetallic sulphides is described. The depressant agent is used in conjunction with conventional collector agents and forthing agents in the flotation separation of copper, nickel, lead, zinc sulphides by depressing iron sulphides such as pyrrhotite, pyrite and marcasite in the tailing. The depressant consists of a cross-linked starch chemically combined with a polyacrylate and sugar free lignin sulphonate.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: September 17, 1991
    Assignee: Falconbridge Limited
    Inventors: Srdjan Bulatovic, Tim M. Jessup, James F. Jackson
  • Patent number: 4952329
    Abstract: A new depressant composition is provided for the enhanced separation into separate value metal concentrates of copper, nickel, zinc, lead present in polymetallic and massive sulphide ores.The depressant is added in an aqueous solution prepared by dissolving first a mixture of quebrachio and dextrin, or quebracho and guar gum. To the solution of modified quebracho a water soluble salt of lignin sulphonate is added. The aqueous polymer of modified quebracho lignin sulphonate is further mixed with one or more of the following inorganic reagents: water soluble cyanide, metal sulphates and water soluble sulphites. The resulting depressant is added together with conventional flotation reagents in conventional mineral separation stages as required.
    Type: Grant
    Filed: August 29, 1989
    Date of Patent: August 28, 1990
    Assignee: Falconbridge Limited
    Inventors: Srdjan Bulatovic, Robert S. Salter
  • Patent number: 4930595
    Abstract: A method and apparatus for remotely determining the profile of an inaccessible subterranean passage for example in a mine. An instrument pod is moved through the passage in steps. At each step, a rangefinder scans the wall of the passage and provides to a remote monitor, range measurements from which a profile can be determined. The pod also carries clinometers for determining the orientation of the pod during each profile measurement. The pod also carries a television camera and lights so that the wall of the passage can be visually inspected.
    Type: Grant
    Filed: October 14, 1987
    Date of Patent: June 5, 1990
    Assignee: Falconbridge Limited
    Inventors: Alan G. Hayward, Lauri C. Gregg, Aurele L. Dutrisac, Jack J. Joliat
  • Patent number: 4880529
    Abstract: A new depressant composition is provided for the enhanced separation into separate value metal concentrates of copper, nickel, zinc, lead present in polymetallic and massive sulphide ores.The depressant is added in an aqueous solution prepared by dissolving first a mixture of quebracho and dextrin, or quebracho and guar gum. To the solution of modified quebracho a water soluble salt of lignin sulphonate is added. The aqueous polymer of modified quebracho lighin sulphonate is further mixed with one or more of the following inorganic reagents: water soluble cyanide, metal sulphates and water soluble sulphites. The resulting depressant is added together with conventional flotation reagents in conventional mineral separation stages as required.
    Type: Grant
    Filed: May 11, 1988
    Date of Patent: November 14, 1989
    Assignee: Falconbridge Limited
    Inventors: Srdjan Bulatovic, Robert S. Salter
  • Patent number: 4877517
    Abstract: A new depressant for use in enhanced separation of polymetallic sulphides is described. The depressant agent is used in conjunction with conventional collector agents and frothing agents in the flotation separation of copper, nickel, lead, zinc sulphides by depressing iron sulphides such as pyrrhotite, pyrite and marcasite in the tailing. The depressant consists of a cross-linked starch chemically combined with a polyacrylate and sugar free lignin sulphonate.
    Type: Grant
    Filed: May 2, 1988
    Date of Patent: October 31, 1989
    Assignee: Falconbridge Limited
    Inventors: Srdjan Bulatovic, Tim M. Jessup
  • Patent number: 4853113
    Abstract: A process is described for the mineral separation of rare earth metal compounds, such as bastnaesite, contained in oxidic minerals. The process is a froth flotation process utilizing a novel collector emulsion, which is an emulsified mixture of:a secondary amine modified sulphonated fatty acid,a high rosin containing tall oil fatty acid,an anionic petroleum sulphonate, anda high molecular weight primary amine.The collector emulsion mixture is added to the aqueous slurry of the comminuted rare earth metal compound containing oxidic mineral, which has been previously conditioned in a conventional manner. The conditioning reagents may include alkaline pH modifiers and gangue depressants such as citric acid, oxalic acid, sodium silicates and fatty acids.The rare earth metal compounds will be concentrated in the froth, and are separated in the conventional manner.
    Type: Grant
    Filed: July 15, 1988
    Date of Patent: August 1, 1989
    Assignees: Falconbridge Limited, Highwood Resources Ltd.
    Inventor: Srdjan Bulatovic