Patents Assigned to Alcan International Limited
  • Patent number: 10697074
    Abstract: This cell (1) comprises a pot shell (2) having two longitudinal sides (18) which are symmetrical in relation to a longitudinal median plane (P) of the electrolytic cell (1), an anode assembly which can only move in vertical translation with respect to the pot shell (2), the anode assembly comprising an anode block (100) and a transverse anode support (200) extending at right angles to the longitudinal sides (18) of the pot shell (2), from which support the anode block (100) is suspended. The anode support (200) comprises two connecting portions (202) from which electrolysis current is supplied to the anode support (200), and the cell (1) comprises electrical connection conductors (20) electrically connected to the two connecting portions (202) of the anode support (200), the two connecting portions (202) being located on either side of the plane (P).
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: June 30, 2020
    Assignee: Rio Tinto Alcan International Limited
    Inventors: Steeve Renaudier, Benoit Bardet, Yves Rochet, Denis Laroche, Olivier Martin
  • Patent number: 10669616
    Abstract: An aluminum alloy composition includes, in weight percent: 0.7-1.10 manganese; 0.05-0.25 iron; 0.21-0.30 silicon; 0.005-0.020 nickel; 0.10-0.20 titanium; 0.014 max copper; and 0.05 max zinc, with the balance being aluminum and unavoidable impurities. The alloy may tolerate higher nickel contents than existing alloys, while providing increased corrosion resistance, as well as similar extrudability, strength, and performance. Billets of the alloy may be homogenized at 590-640° C. and controlled cooled at less than 250° C. per hour. The homogenized billet may be extruded into a product, such as an aluminum alloy heat exchanger tube.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: June 2, 2020
    Assignee: Rio Tinto Alcan International Limited
    Inventors: Nicholas C. Parson, Raynald Guay, Alexandre Maltais
  • Patent number: 10557188
    Abstract: An aluminum alloy composition includes, in weight percent: 0.5-0.7 manganese; 0.05-0.15 iron; 0.3-0.5 silicon; 0.020 max nickel; 0.05-0.15 titanium; 0.01 max copper; and 0.10 max zinc, with the balance being aluminum and unavoidable impurities. The alloy may also have a combined amount of manganese and silicon of at least 0.8 wt. % and/or a Mn/Si ratio of 2.25 or less. The alloy may tolerate higher nickel contents than existing alloys, while providing increased corrosion resistance, as well as similar extrudability, strength, and performance. Billets or other intermediate products formed of the alloy may be homogenized at 500-595° C. and controlled cooled at 400° C. per hour or less. The homogenized billet may be extruded into an extruded product, such as an aluminum alloy heat exchanger tube.
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: February 11, 2020
    Assignee: Rio Tinto Alcan International Limited
    Inventors: Nicholas C. Parson, Greg Lea
  • Patent number: 10513788
    Abstract: A cell includes a pot shell defining an opening through which an anode block is designed to be moved, said anode block being suspended from an anode support forming with said anode block an anode assembly mobile in relation to the pot shell, and a confinement chamber defining a closed volume above said opening for the containment of the gases generated during the production of aluminum, the anode support being connected to an electrical conductor to supply an electrolysis current to the anode block, the anode assembly is fully contained in the confinement chamber, and in that the electrical connection between the mobile electrical conductor and the anode support is made within the confinement chamber.
    Type: Grant
    Filed: January 23, 2015
    Date of Patent: December 24, 2019
    Assignee: Rio Tinto Alcan International Limited
    Inventors: Olivier Martin, Christian Duval, Steeve Renaudier, Benoit Bardet
  • Patent number: 10508042
    Abstract: A process for producing alumina trihydrate includes a digestion step, a separation step, and a precipitation step the separation step including: b1) pretreating a slurry from the digestion step by adding a flocculant to said slurry and mixing the flocculant and the slurry, b2) settling the resulting flocculated slurry in a gravity settler vessel, b3) determining a measured value representative of the concentration of solid particles in the resulting clarified liquor, b4) comparing the measured value with a predetermined threshold, b5) feeding said clarified liquor directly to the precipitation step, while the measured value is less than said predetermined threshold, and b6) redirecting said clarified liquor to the pre-treatment step b1), when the measured value is more than said predetermined threshold. An installation may be configured for operating said process.
    Type: Grant
    Filed: November 28, 2014
    Date of Patent: December 17, 2019
    Assignee: Rio Tinto Alcan International Limited
    Inventors: Michaël Reid, Guy Peloquin, Matthieu St-Laurent, Philippe Racine
  • Patent number: 10494280
    Abstract: A process is disclosed for treating a Bayer process waste comprising a slurry containing bauxite residue and dissolved aluminum. The process comprises supplying the waste to a settling area to cause the bauxite residue to settle out of the slurry, thereby producing a supernatant liquor. The process further comprises neutralizing the supernatant liquor with a solution containing magnesium and calcium to produce a neutralized slurry containing precipitated hydrotalcites and thickening the neutralized slurry to produce a clarified effluent and a compacted slurry containing the precipitated hydrotalcites, part of said compacted slurry being recirculated to the supernatant liquor to be neutralized and/or directly to the neutralizing step. The clarified effluent and the compacted slurry are disposed of separately. Also disclosed is a plant for treating a Bayer process waste.
    Type: Grant
    Filed: October 21, 2013
    Date of Patent: December 3, 2019
    Assignee: Rio Tinto Alcan International Limited
    Inventors: John Victor Anderson, Jean-Marc Rousseaux, Guy Peloquin, Ben O'Brien
  • Patent number: 10480089
    Abstract: The present invention relates to a manufacturing process for an anode assembly intended for cells for the production of aluminum by electrolysis, the anode assembly being of the type having an anode rod, a longitudinal member interdependent with one end of the anode rod and a carbon anode including a cavity in which is housed the longitudinal member, the method comprising a formation phase of at least one sealed area filled with sealing material and at least one unsealed area devoid of sealing material, said at least one unsealed area extending to one of the longitudinal ends of the longitudinal member.
    Type: Grant
    Filed: January 23, 2015
    Date of Patent: November 19, 2019
    Assignee: Rio Tinto Alcan International Limited
    Inventors: Yves Caratini, Denis Laroche, Julien Vallet, Bertrand Allano, Lyes Hacini
  • Patent number: 10465987
    Abstract: The dual-function impeller can be rotated in molten metal in a direction of rotation, as part of a rotary injector. The impeller can have a body having an axis, a plurality of blades circumferentially interspaced around an axis, and an aperture coinciding with the axis. The blades having both a radially extending portion facing the direction of rotation and collectively generating a radial flow component upon said rotation, and a slanted portion also facing the direction of rotation, inclined relative to a radial plane, and collectively generating an axial flow component directed away from the rotary injector upon said rotation.
    Type: Grant
    Filed: September 26, 2014
    Date of Patent: November 5, 2019
    Assignee: Rio Tinto Alcan International Limited
    Inventors: Joseph Langlais, Peter Donald Waite, Francis Breton, Serge Munger, Martin Beaulieu
  • Patent number: 10457008
    Abstract: A screw press includes a filter casing having inlet and outlet sections and a filter section therebetween. A screw is mounted in the casing for conveying a solid-liquid mixture from the inlet section to the outlet section while compressing the solid-liquid mixture and forcing at least part of a liquid content thereof to be expelled out of the filter casing. The casing and the screw are of modular construction. The filter section has at least first and second serially interconnectable filter sections, and the screw has at least first and second serially interconnectable screw sections respectively disposed in the first and second filter sections for joint rotation as a unitary component. The first and second screw sections have a continuous screw flight having a flight outside diameter. The first and second screw sections are detachably coupled to one another by a coupling provided at the outside diameter of the flight.
    Type: Grant
    Filed: April 9, 2015
    Date of Patent: October 29, 2019
    Assignee: Rio Tinto Alcan International Limited
    Inventors: Alain Boivin, Deane Labrum, Guy Simard, Pascal Vandal
  • Patent number: 10443140
    Abstract: Anode assembly (100) comprising an anode (3) and an anode support (4) for the production of aluminum, characterized in that the anode assembly (100) comprises an electrical connecting element (1) to electrically connect the anode support (4) with the anode (3), and at least one thermally insulating element (6) arranged to reduce heat transfer between the anode (3) and the anode support (4) during the production of aluminum.
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: October 15, 2019
    Assignee: Rio Tinto Alcan International Limited
    Inventors: Sébastien Becasse, Jean-François Bilodeau, Denis Laroche, Laurent Fiot, Steve Langlois
  • Patent number: 10358733
    Abstract: This aluminum smelter comprises a line of electrolytic cells arranged transversely to the line, one of the cells comprising anode assemblies and electrical conductors mounted and connecting the anode assemblies. Rising and connecting conductors extend upwardly along two opposite longitudinal edges of the cell. In addition, the aluminum smelter comprises a first electrical compensating circuit extending under the cell and which can be traversed by a first compensating current in the opposite direction to that of the electrolysis current, a second electrical compensating circuit extending on one side of the line that can be traversed by a second compensating current in the same direction as the electrolysis current.
    Type: Grant
    Filed: February 5, 2016
    Date of Patent: July 23, 2019
    Assignee: Rio Tinto Alcan International Limited
    Inventors: Benoit Bardet, Steeve Renaudier
  • Patent number: 10344390
    Abstract: This aluminum smelter comprises a row of cells (50) arranged transversely in relation to the length of the row, the cells (50) individually comprising an anode (52), rising and connecting electrical conductors (54) running upwards along the two opposite longitudinal edges of the cell (50) to route the electrolysis current towards the anode (52), and a cathode (56) through which pass cathode conductors (55) connected to cathode outputs connected to linking conductors to route the electrolysis current to the rising and connecting electrical conductors of the next cell (50). Furthermore the aluminum smelter comprises a compensating electrical circuit separate from the electrical circuit through which the electrolysis current flows, running beneath the cells (50), through which a compensating current may flow beneath the cells (50) in a direction opposite to the overall direction of flow of the electrolysis current.
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: July 9, 2019
    Assignee: Rio Tinto Alcan International Limited
    Inventors: Steeve Renaudier, Benoit Bardet, Olivier Martin, Christian Duval
  • Publication number: 20190136349
    Abstract: The present disclosure provides Al—Si—Mg aluminum alloys comprising a deliberate addition of Mn between 0.05-0.40 weight percent to increase at least one tensile property (such as the yield strength) of an aluminum product comprising such alloy. The Al—Si—Mg alloy comprises, in weight percent, 5-9% Si, 0.35-0.75% Mg, 0.05-0.4% Mn, less than 0.15% Fe, up to 0.15% Ti, 0.005-0.03% Sr and the balance being aluminum and unavoidable impurities, wherein the unavoidable impurities may be present in an amount of up to 0.05% each and up to 0.15% total. The present disclosure provides a foundry ingot comprising the above Al—Si—Mg aluminum alloy, a process for making the above Al—Si—Mg aluminum alloy and an aluminum alloy obtainable by said process.
    Type: Application
    Filed: March 10, 2017
    Publication date: May 9, 2019
    Applicant: Rio Tinto Alcan International Limited
    Inventors: Francis Breton, Bruno Bourassa, Alexandre Maltais, Clément Boudreault, Dany Tremblay
  • Publication number: 20190127823
    Abstract: An aluminum alloy for making an extruded and brazed aluminum product, the aluminum alloy comprising, in weight percent, 0.10-0.20 Zn to improve corrosion resistance, 0.9-1.2 Mn, 0.03-0.10 Mg, the sum of Mg and Mn being at least 0.99 to maintain or improve strength, 0.15 to 0.30 Fe to control grain size, up to 0.15 Si, up to 0.03 Cu, up to 0.04 Ti, the balance being aluminum and unavoidable impurities. The alloy may be in the form of extrusion ingots or extruded and brazed aluminum products. A process for making an extruded and brazed aluminum product from the alloy involves homogenizing, extruding, optionally working, and brazing the alloy to form the product.
    Type: Application
    Filed: April 10, 2017
    Publication date: May 2, 2019
    Applicant: Rio Tinto Alcan International Limited
    Inventors: Nicholas C. PARSON, Raynald GUAY
  • Patent number: 10151038
    Abstract: An electrolysis device comprising a pot shell (3) and an inner lining (5) defining an opening (16) through which an anode block (15) suspended from an anode support (13, 17) forming an anode assembly (12) moves vertically by means of an anode receiver (25), said anode receiver being placed outside a space defined by the top of said anode block (15), said anode receiver comprising an anode contact surface (27) working in conjunction with the anode support (13, 17) to establish therewith electrical contact and mechanical contact to moving the anode assembly (12) vertically. An anode assembly (12). An electrolytic cell and an electrolysis installation comprising such an anode assembly.
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: December 11, 2018
    Assignee: Rio Tinto Alcan International Limited
    Inventors: Yves Rochet, Frédéric Brun, Steeve Renaudier
  • Patent number: 10113645
    Abstract: A seal arrangement allowing in-line maintenance and replacement of packing, seals and bushings of a rotary shaft driving a tool extending inside a fluid holding tank. The rotary shaft and associated seals are mounted in an extractable cartridge removably insertable in sealing engagement within a housing projecting outwardly from the tank. A secondary seal comprises an isolation valve mounted to the housing outside of the tank for temporarily providing sealing during servicing of the seals in the extracted cartridge. A tertiary seal is provided for protecting the secondary seal from the tank contents when used in scaling environments. Removable parts of said seal arrangement.
    Type: Grant
    Filed: December 4, 2014
    Date of Patent: October 30, 2018
    Assignee: Rio Tinto Alcan International Limited
    Inventors: Deane Labrum, Dean Beltrame, Guy Peloquin, Alain Boivin
  • Patent number: 10000828
    Abstract: An aluminum alloy having an excellent combination of strength, extrudability and corrosion resistance may include in weight percent, about 0.01% or less copper; about 0.15% or less iron; about 0.60 to about 0.90% manganese, where manganese and iron are present in the alloy in a Mn:Fe ratio of at least about 6.6; about 0.02% or less nickel; about 0.08 to about 0.30% silicon; about 0.10 to about 0.20% titanium; and about 0.05 to about 0.20% zinc; the balance being aluminum and unavoidable impurities. Extruded articles and other articles may be formed using the alloy. Methods of forming such articles may include homogenizing a billet of the alloy prior to forming the article.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: June 19, 2018
    Assignee: Rio Tinto Alcan International Limited
    Inventors: Nicholas Charles Parson, Raynald Guay, Alexandre Maltais
  • Patent number: 9982328
    Abstract: The subject of the invention is a cast part with high static mechanical strength, and for fatigue and hot creep, made of aluminum alloy of composition: Si: 3-11%, preferably 5.0-9.0% Fe<0.50%, preferably <0.30%, preferably still <0.19% or even 0.12% Cu: 2.0-5.0%, preferably 2.5-4.2%, preferably still 3.0-4.0% Mn: 0.05-0.50%, preferably 0.08-0.20% Mg: 0.10-0.25%, preferably 0.10-0.20% Zn: <0.30%, preferably <0.10% Ni: <0.30%, preferably <0.10% V: 0.05-0.19%, preferably 0.08-0.19%, preferably still 0.10-0.19% Zr: 0.05-0.25%, preferably 0.08-0.20% Ti: 0.01-0.25%, preferably 0.05-0.20% other elements <0.05% each and 0.15% in total, the rest aluminum. It more particularly relates to cylinder heads for supercharged diesel or petrol internal combustion engines.
    Type: Grant
    Filed: July 1, 2009
    Date of Patent: May 29, 2018
    Assignee: Rio Tinto Alcan International Limited
    Inventor: Michel Garat
  • Patent number: 9970090
    Abstract: An aluminum alloy includes, in weight percent, 0.70-0.85 Si, 0.14-0.25 Fe, 0.25-0.35 Cu, 0.05 max Mn, 0.75-0.90 Mg, 0.12-0.18 Cr, 0.05 max Zn, and 0.04 max Ti, the balance being aluminum and unavoidable impurities. The alloy may be suitable for extruding, and may be formed into an extruded alloy product.
    Type: Grant
    Filed: December 19, 2016
    Date of Patent: May 15, 2018
    Assignee: Rio Tinto Alcan International Limited
    Inventors: Nick C. Parson, Raynald Guay, Alexandre Maltais
  • Patent number: 9958208
    Abstract: Control process for a furnace for baking carbon anodes comprising: longitudinal hollow partitions in each of which a flow of hot baking gas may circulate, hollow partitions together defining cells to receive the anodes to be baked, and a heating system rotating in relation to the hollow partitions comprising an upstream blowing ramp blowing air into the various partitions, a downstream suction ramp sucking gas from the various partitions and at least one heating ramp. This process comprises a natural pre-heating phase of the partitions and anodes which release combustible, volatile matter which burns inside the hollow partitions as a degassing in a natural pre-heating zone of the furnace downstream of the heating ramp. According to the invention, gas flows circulating in the hollow partitions are modified so as to control gas flows passing through a first natural pre-heating zone from gas flows leaving a second natural pre-heating zone to control the location of the degassing front.
    Type: Grant
    Filed: June 7, 2010
    Date of Patent: May 1, 2018
    Assignee: Rio Tinto Alcan International Limited
    Inventors: François Morales, Alain De La Torre