Patents by Inventor Jean-Michel Demarthe

Jean-Michel Demarthe has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4954322
    Abstract: The invention relates to a process for the recovery of metal values contained in a ferric gangue.The process comprises the following stages:(a) dissolution of the metal values from the ferric gangue with sulphuric acid;(b) recovery of the metal value or values by a method which is known per se,(c) evaporation of the acid ferric solution resulting from stage (b) so as to increase the acidity to a value of between about 50 and 100%,(d) crystallization from this solution, at a temperature of between -10 and 50.degree. C., of a hydrated iron sulphate of formula Fe.sub.2 (SO.sub.4).sub.3.9H.sub.2 O.Application to the recovery of strategic metals.
    Type: Grant
    Filed: July 27, 1989
    Date of Patent: September 4, 1990
    Assignee: Metaleurop S.A.
    Inventor: Jean-Michel DeMarthe
  • Patent number: 4902343
    Abstract: The invention provides a hydrometallurgical process for recovering lead in essentially pure form from a sulphurized compound containing at least lead as a non-ferrous metal. The process involves treating the sulphurized compound with an aqueous lixiviating solution containing at least one chloride of a metal selected from the group consisting of copper, bismuth, antimony, arsenic, and silver, preferably cupric chloride, the quantity of said at least one chloride being less than or equal to that which is stoichiometrically required for the complete dissolution of the lead contained in the sulphurized compound, thereby to obtain a solution containing lead chloride and the chlorides of metals nobler than lead as impurities if originally present in the sulphurized lead compound, and an insoluble residue containing the sulphide of the metal of said at least one chloride, the sulphides of the non-ferrous metals originally present in the sulphurized compound, and free sulphur.
    Type: Grant
    Filed: September 22, 1982
    Date of Patent: February 20, 1990
    Assignee: Societe Miniere et Metallurgique de Penarroya
    Inventors: Jean-Michel Demarthe, Andre Georgeaux
  • Patent number: 4435368
    Abstract: The invention provides a process for the selective dissolution of oxygenated compounds containing at least one non-ferrous metal selected from the group consisting of nickel, zinc, and copper, present in a mixture of oxygenated compounds containing said at least one non-ferrous metal and at least one element selected from the group consisting of lead, cobalt, iron, manganese, and silicon, and comprises suspending the mixture of the oxygenated metallic compounds in an aqueous phase which, preferably, contains chloride and alkaline earth metal ions; treating the resulting aqueous suspension, maintained at a pH exceeding about 1, with chlorine, preferably at a temperature ranging from about 60.degree. C. to the boiling point of the suspension, to selectively solubilize the said at least one non-ferrous metal while the said at least one element remains in an essentially insoluble residue; and separating the aqueous solution containing the dissolved said at least one non-ferrous metal from the insoluble residue.
    Type: Grant
    Filed: October 22, 1979
    Date of Patent: March 6, 1984
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Jean-Michel Demarthe, Paolo Fossi, Louis Gandon
  • Patent number: 4311676
    Abstract: This present invention provides a process of recovering uranium from a uranium-containing acid lixiviation solution comprising extracting the lixiviation solution with an organic extractant comprising an organic diluent, a dialkyl pyrophosphoric acid, and a stabilization agent, and treating the mixture of solutions as follows:(a) bubbling anhydrous ammonia gas into the solution mixture to precipitate the ammonium salt of excess dialkyl pyrophosphoric acid; and(b) separating the precipitate from the solution and recovering the uranium from the solution.
    Type: Grant
    Filed: March 2, 1979
    Date of Patent: January 19, 1982
    Assignee: Minemet Recherche
    Inventors: Jean-Michel Demarthe, Serge Solar
  • Patent number: 4288304
    Abstract: The invention provides a process for extracting zinc from a sulphur- and zinc-containing ore which involves (a) leaching the sulphur ore or concentrate with an aqueous solution of cupric chloride, which can be regenerated by means of a regenerating agent and air; (b) subjecting the solution thus obtained to liquid-liquid extraction by means of an organic phase, preferably containing a solvent, comprising an acid organophosphorus compound; and (c) recovering the zinc contained in the said organic phase after the said extraction, preferably by elution. If justified by the composition of the ore, the following optional recovery steps may then be performed:(1) if lead is present, recovery of lead by cementation (i.e., precipitation) or by crystallization of lead dichloride followed by cementation of the crystallizate;(2) if copper is present, recovery of copper by cementation or by liquid-liquid extraction; and(3) if precious metals, e.g.
    Type: Grant
    Filed: May 15, 1980
    Date of Patent: September 8, 1981
    Assignee: Societe Miniere et Metallurgique de Penarroya
    Inventors: Jean-Michel DeMarthe, Louis Gandon, Andre Georgeaux
  • Patent number: 4282188
    Abstract: A process for recovering uranium contained in phosphated solutions including the steps of contacting the solution with a diester of pyrophosphoric acid, reextracting the uranium with an alkaline solution, precipitating the uranium, acidifying and agitating the resulting product, separating the organic phase from the aqueous phase and recycling the organic phase to the initial contacting step. The precipitate is separated prior to recycling.
    Type: Grant
    Filed: August 23, 1978
    Date of Patent: August 4, 1981
    Assignee: Minemet Recherche
    Inventors: Jean-Michel Demarthe, Paolo Fossi, Dominique Guery
  • Patent number: 4236981
    Abstract: This invention provides a process for treating a nickel matte to recover essentially pure nickel comprising: treating an aqueous mixture of the matte with chlorine to produce a solid residue and an aqueous lixiviating solution having a pH value which is substantially nil or positive; treating the lixiviating solution to produce a solution containing primarily nickel chloride; and electrolyzing the solution to recover pure nickel at the cathode.
    Type: Grant
    Filed: July 5, 1979
    Date of Patent: December 2, 1980
    Assignee: Societe Metallurgique le Nichel-S.L.N.
    Inventors: Jean-Michel Demarthe, Louis Gandon, Monique Goujet
  • Patent number: 4230487
    Abstract: The invention provides a method for selectively solubilizing the non-ferrous metals contained in sulphurized ores and concentrates, with regard to the iron and sulphur therein, by subjecting the ore or concentrate to lixiviation with an aqueous solution of cupric chloride at a temperature above 50.degree. C., preferably at a temperature between 70.degree. C. and 105.degree. C., and then regenerating said aqueous solution in situ at atmospheric pressure by means of air and a regeneration agent selected from the group consisting of hydrochloric acid and ferrous chloride. The invention also contemplates the preferable inclusion in the aqueous cupric chloride solution of an agent for solubilizing cuprous chloride selected from the group consisting of an alkali metal chloride, an alkaline earth metal chloride, ammonium chloride, and ferrous chloride.
    Type: Grant
    Filed: September 7, 1979
    Date of Patent: October 28, 1980
    Assignee: Societe Miniere et Metallurgique de Penarroya
    Inventors: Jean-Michel Demarthe, Louis Gandon, Andre Georgeaux
  • Patent number: 4173520
    Abstract: This invention provides a process for treating a nickel matte to recover essentially pure nickel comprising: treating an aqueous mixture of the matte with chlorine to produce a solid residue and an aqueous lixiviating solution having a pH value which is substantially nil or positive; treating the lixiviating solution to produce a solution containing primarily nickel chloride; and electrolyzing the solution to recover pure nickel at the cathode.
    Type: Grant
    Filed: November 8, 1977
    Date of Patent: November 6, 1979
    Assignee: Societe Metallurgique le Nickel-S.L.N.
    Inventors: Jean-Michel Demarthe, Louis Gandon, Monique Goujet
  • Patent number: 4166737
    Abstract: A method for the dissolution of non-ferrous metals contained in oxygenated compounds in which the oxygenated compounds are subjected to the action of a ferrous chloride solution and a gas containing oxygen is mixed with the solution.
    Type: Grant
    Filed: December 7, 1977
    Date of Patent: September 4, 1979
    Assignee: Minemet Recherche
    Inventors: Jean-Michel Demarthe, Andre Georgeaux
  • Patent number: 4090871
    Abstract: The invention provides a process for recovering germanium as germanium oxide from a germaniferous metallic zinc which involves distilling the germaniferous metallic zinc under non-oxidizing conditions, recovering the distillation residue which contains the germanium, leaching the recovered distillation residue with chlorine water to convert the germanium into germanium tetrachloride, hydrolyzing the germanium tetrachloride into germanium oxide, and recovering the germanium oxide. Optionally, the germanium oxide may be reduced to metallic germanium, if desired.
    Type: Grant
    Filed: July 8, 1976
    Date of Patent: May 23, 1978
    Assignee: Societe Miniere et Metallurgique de Penarroya
    Inventors: Albert Lebleu, Paul Fossi, Jean-Michel Demarthe
  • Patent number: 4023964
    Abstract: The invention provides a method for obtaining electrolytic copper from copper-bearing ores which involves (a) lixiviating a sulphurized copper concentrate with an aqueous solution containing cupric chloride; (b) separating the solution resulting from the lixiviation stage (a) into two parts, one of said parts, containing at least 1 gram of cuprous ions per liter and at least 2 grams of ferrous ions per liter, being subjected to oxidation by air at atmospheric pressure, at a pH value between 1 and 3, and at a temperature above 90.degree. C.
    Type: Grant
    Filed: May 15, 1975
    Date of Patent: May 17, 1977
    Assignee: Societe Miniere et Metallurgique de Penarroya
    Inventors: Jean-Michel DeMarthe, Alain Sonntag, Andre Georgeaux
  • Patent number: 4016056
    Abstract: A method for obtaining electrolytic copper and other useful metals from sulphurized concentrates, including in combination, the following stages:A. lixiviating the sulphurized concentrate with an aqueous solution containing cupric chloride formed in situ, at least in part, by oxidation, by introducing hydrochloric acid and air into the cuprous chloride solution resulting from lixiviation;B. partially extracting the copper contained in the lixiviation solution resulting from stage a) by contacting the lixiviation solution with an organic extractant containing a cationic solution, the extraction being accompanied by oxidation by injecting air into the lixiviation solution;C. re-extracting the copper contained in the organic extractant by contacting the organic extractant with an aqueous solution of sulphuric acid and recycling the organic extractant to the extraction stage b); andD.
    Type: Grant
    Filed: May 15, 1975
    Date of Patent: April 5, 1977
    Assignee: Societe Miniere et Metallurgique de Penarroya
    Inventors: Jean-Michel Demarthe, Andre Georgeaux, Alain Sonntag
  • Patent number: 4016054
    Abstract: The present invention relates to a hydrometallurgical treatment process for extracting, in a pure (elemental) or other valuable (i.e. commercially usable) form, constituent metals from ferro-nickel, that is nickel, cobalt, iron and sometimes chromium.
    Type: Grant
    Filed: July 10, 1975
    Date of Patent: April 5, 1977
    Assignee: Imetal
    Inventors: Louis Gandon, Jean-Michel Demarthe
  • Patent number: 3998628
    Abstract: A method for selectively dissolving non-ferrous metals contained in pyritic ores by the steps of crushing the ores, introducing the crushed ore at a temperature above the ambient temperature into a reaction vessel containing a solution of chlorides of a metal having two valance states, and injecting gaseous chlorine into the reaction vessel at a rate such that the oxido-reduction potential of the solution of chlorides remains between 400 and 700 mv during the operation.
    Type: Grant
    Filed: February 26, 1975
    Date of Patent: December 21, 1976
    Assignee: Societe Miniere et Metallurgique de Penarroya
    Inventors: Louis Gandon, Jean-Michel Demarthe, Alain Alexandre Sonntag
  • Patent number: 3992270
    Abstract: A method and apparatus for reclaiming nickel values from a nickeliferous alloy in which the nickeliferous alloy is subjected to nitric lixiviation and the nickel values are recovered from the resulting nickel nitrate solution.
    Type: Grant
    Filed: January 29, 1975
    Date of Patent: November 16, 1976
    Assignee: Imetal
    Inventors: Robert Lemarinel, Jean-Michel Demarthe, Louis Gandon