Patents by Inventor Kazuaki Takebayashi
Kazuaki Takebayashi 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).
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Patent number: 9234259Abstract: A process for recovering copper from an acid aqueous solution containing cupric chlorides and alkali metal and/or alkali earth metal chlorides by a solvent extraction with a cation-exchange extractant, comprising the step of processing a solvent extraction in the presence of sulfate ions.Type: GrantFiled: January 6, 2009Date of Patent: January 12, 2016Assignee: JX NIPPON MINING & METALS CORPORATIONInventors: Yoshifumi Abe, Hiroshi Hosaka, Kazuaki Takebayashi, Akira Yoshimura, Takeshi Nakamura
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Patent number: 8585798Abstract: The copper sulfide ore is leached in the halide bath without using a special oxidant but with the use of only air. The copper and gold in the copper sulfide ore can be leached at high leaching ratio. The treating steps are as follows. (1) Copper leaching process (CL). The raw material is charged into the first acidic aqueous solution, which contains cupric chloride, ferric chloride, 7 g/L of hydrochloric acid, and sodium chloride. The post-leach liquor contains copper in cuprous state ions and copper in cupric state ions. (2) Solid-Liquid separation step. The resultant solid and liquid of CL step are separated. (3) Air oxidation step (OX). Air is blown into the post solid-liquid separation liquor. The copper in cuprous state ions are oxidized to the copper in cupric state ions. The iron leached in the step (1) is oxidized. Simultaneously, the impurities leached in the step (2) are precipitated. (4) Copper extracting step (CEX).Type: GrantFiled: September 10, 2008Date of Patent: November 19, 2013Assignee: Nippon Mining & Metals Co., Ltd.Inventors: Yoshifumi Abe, Hiroshi Hosaka, Kazuaki Takebayashi, Yasunari Ishiguro, Akira Yoshimura
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Patent number: 8388730Abstract: A process of leaching gold comprising the steps of: a) leaching copper from copper sulfide ore material that contains gold or contains silicate ore containing gold until the copper grade is reduced to 7.9 wt % or less; b) mixing the resulting material having a copper grade of 7.9 wt % or less with a gold leaching solution selected from the group consisting of a first solution containing chloride ions and ferric ions, and a second solution containing chloride ions and iron ions, the iron ions having been oxidized to trivalent ferric ions by air bubbled into the second solution; c) adjusting the pH of the gold leaching solution to 1.9 or less with stirring to leach at least gold in the material into the gold leaching solution by the oxidative activity of the ferric ions contained in the gold leaching solution, wherein the concentration of gold is reduced by selectively removing gold from part or all of the gold leaching solution during gold leaching.Type: GrantFiled: July 3, 2008Date of Patent: March 5, 2013Assignee: JX Nippon Mining & Metals CorporationInventors: Yoshifumi Abe, Hiroshi Hosaka, Kazuaki Takebayashi, Yasunari Ishiguro, Akira Yoshimura
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Patent number: 7842120Abstract: A method of obtaining copper from feedstock includes: providing feedstock into acid solution including chloride and bromide of one of alkali metal and alkali earth metal, and one of chloride of copper and iron and bromide of copper and iron; leaching monovalent copper and divalent copper with use of oxidizing power of at least one of iron ion and copper ion, with air being blown into the acid solution under an atmospheric pressure at a temperature less than a boiling point of the acid solution; solid-liquid separating the acid solution; blowing air into the solution; oxidizing copper in the solution; coprecipitating iron and impurity; extracting copper from the solution from which deposition including the coprecipitate is separated; obtaining the extracted copper into sulfuric acid solution as copper sulfate; obtaining copper from the copper sulfate; and recycling hydrochloric acid generated in the extracting in another copper leaching.Type: GrantFiled: July 30, 2008Date of Patent: November 30, 2010Assignee: JX Nippon Mining & Metals CorporationInventors: Yoshifumi Abe, Hiroshi Hosaka, Kazuaki Takebayashi, Yasunari Ishiguro, Akira Yoshimura
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Publication number: 20100031779Abstract: A process for recovering copper from an acid aqueous solution containing cupric chlorides and alkali metal and/or alkali earth metal chlorides by a solvent extraction with a cation-exchange extractant, comprising the step of processing a solvent extraction in the presence of sulfate ions.Type: ApplicationFiled: January 6, 2009Publication date: February 11, 2010Applicant: NIPPON MINING & METALS CO., LTD.Inventors: Yoshifumi Abe, Hiroshi Hosaka, Kazuaki Takebayashi, Akira Yoshimura, Takeshi Nakamura
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Publication number: 20090241732Abstract: A method of obtaining copper from sulfide ore including copper (hereinafter referred to as feedstock) includes: providing feedstock into acid solution, the acid solution including chloride and bromide of one of alkali metal and alkali earth metal, and one of chloride of copper and iron and bromide of copper and iron; leaching monovalent copper and divalent copper from the feedstock with use of oxidizing power of at least one of iron ion and copper ion in the acid solution, with air being blown into the acid solution under an atmospheric pressure at a temperature less than a boiling point of the acid solution; solid-liquid separating the acid solution after the leaching; blowing air into the solution after the solid-liquid separation; oxidizing copper in the solution; coprecipitating iron and impurity that are leached into the acid solution from the feedstock; extracting copper from the solution after the oxidizing from which deposition including the coprecipitate is separated; obtaining the extracted copper iType: ApplicationFiled: July 30, 2008Publication date: October 1, 2009Inventors: Yoshifumi Abe, Hiroshi Hosaka, Kazuaki Takebayashi, Yasunari Ishiguro, Akira Yoshimura
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Publication number: 20090241735Abstract: A process of leaching gold comprising the steps of: a) leaching copper from copper sulfide ore material that contains gold or contains silicate ore containing gold until the copper grade is reduced to 7.9 wt % or less; b) mixing the resulting material having a copper grade of 7.9 wt % or less with a gold leaching solution selected from the group consisting of a first solution containing chloride ions and ferric ions, and a second solution containing chloride ions and iron ions, the iron ions having been oxidized to trivalent ferric ions by air bubbled into the second solution; c) adjusting the pH of the gold leaching solution to 1.9 or less with stirring to leach at least gold in the material into the gold leaching solution by the oxidative activity of the ferric ions contained in the gold leaching solution, wherein the concentration of gold is reduced by selectively removing gold from part or all of the gold leaching solution during gold leaching.Type: ApplicationFiled: July 3, 2008Publication date: October 1, 2009Inventors: Yoshifumi Abe, Hiroshi Hosaka, Kazuaki Takebayashi, Yasunari Ishiguro, Akira Yoshimura
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Publication number: 20090241736Abstract: The copper sulfide ore is leached in the halide bath without using a special oxidant but with the use of only air. The copper and gold in the copper sulfide ore can be leached at high leaching ratio. The treating steps are as follows. (1) Copper leaching process (CL). The raw material is charged into the first acidic aqueous solution, which contains cupric chloride, ferric chloride, 7 g/L of hydrochloric acid, and sodium chloride. The post-leach liquor contains copper in cuprous state ions and copper in cupric state ions. (2) Solid-Liquid separation step. The resultant solid and liquid of CL step are separated. (3) Air oxidation step (OX). Air is blown into the post solid-liquid separation liquor. The copper in cuprous state ions are oxidized to the copper in cupric state ions. The iron leached in the step (1) is oxidized. Simultaneously, the impurities leached in the step (2) are precipitated. (4) Copper extracting step (CEX).Type: ApplicationFiled: September 10, 2008Publication date: October 1, 2009Applicant: NIPPON MINING & METALS CO., LTD.Inventors: Yoshifumi Abe, Hiroshi Hosaka, Kazuaki Takebayashi, Yasunari Ishiguro, Akira Yoshimura
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Patent number: 5543031Abstract: In order to recover indium, while preventing generation of chlorine gas, by a direct electrowinning method from a hydrochloric acid solution from which impurities have been removed by various chemical purification methods, an electrolysis is carried out by using an indium-containing hydrochloric acid solution as an electrolyte for a cathode compartment equipped with a cathode comprising an indium starting sheet, by using a sulfuric acid solution in an anode compartment equipped with an insoluble anode and separating the cathode compartment and the anode compartment with a diaphragm of a cation exchange material.Type: GrantFiled: February 10, 1995Date of Patent: August 6, 1996Assignee: Nippon Mining & Metals Co., Ltd.Inventors: Hidenori Okamoto, Kazuaki Takebayashi