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Patent
Sumitomo Metal Mining Co. | Date: 2016-07-27

Provided is a production method for refining iron oxide (hematite) having such a low sulfur content as to be used as a raw material for ironmaking from a leach residue containing iron oxide, the leach residue being produced by a high pressure acid leach (HPAL) process. The method is to produce (high-purity) hematite for ironmaking by a process of adding an oxidant and sulfuric acid to nickel oxide ore and then leaching nickel, the method further including: forming a neutralized residue having a sulfur grade exceeding 1.0% by weight by adding a neutralizing agent to leach slurry and being subjected to solid-liquid separation, the neutralizing agent serving to form plaster by reaction with a free sulfuric acid of surplus acid contained in the leach slurry, the leach slurry being a mixture of a leachate and a leach residue obtained after leaching the nickel; and heating the neutralized residue at a heating temperature of 600C or more and 1400C or less to form hematite having a sulfur grade of 1.0% or less by weight. Provided is a method of producing (high-purity) hematite for ironmaking by a process of adding an oxidant and sulfuric acid to nickel oxide ore and then leaching nickel, the method further including: forming a neutralized residue having a sulfur grade exceeding 1.0% by weight by adding a neutralizing agent to leach slurry and being subjected to solid-liquid separation, the neutralizing agent serving to form plaster by reaction with a free sulfuric acid of surplus acid contained in the leach slurry, the leach slurry being a mixture of a leachate and a leach residue obtained after leaching the nickel; and heating the neutralized residue at a heating temperature of 600C or more and 1400C or less to form hematite having a sulfur grade of 1.0% or less by weight.(128 words)


Patent
Sumitomo Metal Mining Co. | Date: 2016-10-19

The present invention effectively recovers a scandium concentrate from an Al-Sc alloy. This scandium concentrate production method includes: a molten mixture production step (S1) in which an alloy that contains aluminum and scandium is brought into contact with chlorine and melted in order to produce a molten mixture of aluminum chloride and scandium chloride; a first electrolysis step (S2) in which the molten mixture is subjected to first electrolysis using a first cathode at a potential that is between the potential that causes aluminum to form a metal and the potential that causes scandium to form a metal and aluminum is produced around the first cathode; and a second electrolysis step (S3) in which, after a molten aluminum production step, the molten mixture is subjected to second electrolysis using a second electrode at a potential that makes it possible to recover scandium and a scandium concentrate is produced around a second cathode.


Patent
Sumitomo Metal Mining Co. | Date: 2016-10-19

The present invention effectively recovers a scandium concentrate from an Al-Sc alloy. This scandium concentrate recovery method includes: a cooling step in which a molten alloy that comprises aluminum and scandium is maintained at a cooling speed of 10-100 C per minute while being cooled to 660-730 C; a holding step in which the temperature of 660-730 C is held for a fixed length of time; and a recovery step in which a solid scandium concentrate is recovered. The present invention makes it possible to effectively recover a scandium concentrate from an Al-Sc alloy. The scandium concentrate can be reused as is as a high-quality Al-Sc master alloy. In addition, it is possible to recover scandium in an extremely efficient manner as compared to when recovering from nickel oxide ore by solvent extraction and the like.


Patent
SUMITOMO METAL MINING COMPANY Ltd | Date: 2016-04-13

The present invention provides a production method for obtaining a solution with a high content of nickel and cobalt by more simply and more efficiently separating nickel and cobalt from a positive electrode material of a spent nickel-metal hydride battery, a production waste material of a positive electrode material, or the like. The method is characterized in that an acid solution containing nickel is obtained by treating a positive electrode material of a nickel-metal hydride battery through the steps of: a water-washing step, wherein a positive electrode material of a nickel-metal hydride battery is water-washed by adding water, and then separated to form a positive electrode material after water-washing and a water-washed slurry; an acid-washing step, wherein an acid is added and mixed into the positive electrode material after water-washing which has been obtained in the water-washing step, and, with pH maintained in a range of not less than 0.0 and not more than 3.5, separation is performed to form a positive electrode material after acid-washing and an acid-washed slurry; and a dissolution step, wherein the positive electrode material after acid-washing which has been obtained in the acid-washing step is separated into a nickel solution and a dissolution residue by adding both an acid and an oxidizing agent, or any one of an acid and an oxidizing agent.


Patent
Sumitomo Metal Mining Co. | Date: 2016-10-12

Provided is a scandium chloride production method that effectively separates an Al-Sc alloy into aluminum and scandium. The present invention includes: a heating step in which an alloy that comprises scandium and aluminum is heated to 300-700 C under a chlorine gas atmosphere; and a scandium chloride recovery step in which scandium chloride is recovered from a solid phase after the heating step. The method includes a hydrogen chloride generation step in which aluminum chloride that is obtained in the heating step is brought into contact with hydrogen gas and hydrogen chloride is generated and a chlorine gas generation step in which hydrogen chloride is subjected to electrolysis in order to generate chlorine gas. The chlorine gas that is used in the heating step preferably comprises the chlorine gas that is obtained in the chlorine gas generation step. In addition, the scandium chloride production method preferably includes a scandium oxide recovery step in which scandium chloride is dissolved in order to obtain a scandium solution, oxalic acid is subsequently added to the scandium solution in order to obtain scandium oxalate, the scandium oxalate is oxidized, and scandium oxide is recovered.


Patent
Sumitomo Metal Mining Co. | Date: 2016-10-05

Process for manufacturing nickel-cobalt composite represented by Ni_(1xy)Co_(x)Mn_(y)M_(z)(OH)_(2 )(where, 0.05x0.95, 0y0.55, 0z0.1, x+y+z<1, and M is at least one metal-element selected from Al, Mg, and the like), includes: forming seed particle, while reaction solution having mixed solution containing metal compounds and ammonia solution containing ammonium ion supply source at discharge head of an impeller from 50-100 m^(2)/s^(2), the concentration of nickel ions is maintained within range 0.1-5 ppm by mass, whereby seed particles are formed; and growing seed particle wherein solution is obtained by supplying mixed and ammonium solutions to reaction solution is agitated with a concentration of nickel ions being maintained within range 5-300 ppm by mass and higher than the concentration of nickel ions in seed particle formation, whereby seed particles are grown up.


Patent
Sumitomo Metal Mining Co. | Date: 2016-04-27

[Object] To provide a high-quality, transparent garnet single crystal with suppressed cell growth that would otherwise lead to partially inhomogeneous crystal composition, and a method for producing the garnet single crystal. [Solving means] The garnet single crystal is grown by bringing a seed crystal into contact with a raw-material melt in a crucible disposed inside a chamber and pulling, while rotating, the seed crystal. The garnet single crystal is characterized by being represented by a general formula: (Tb_(3-x)Sc_(x)) (Sc_(2-y)Al_(y))Al_(3)O_(12-z) (provided that 0.11x0.14, and 0.17y0.23). The garnet single crystal is grown as follows. First, a mixture powder containing 20.9 to 21.2% by mole terbium oxide, 32.7 to 33.3% by mole scandium oxide, and the balance of aluminium oxide and unavoidable impurities is filled into the crucible and melted. Then, while a nitrogen gas is supplied into the chamber, the number of rotations of the seed crystal is set to 5 to 20 rpm, and the rate of pulling the seed crystal is set to 0.3 to 0.8 mm/h for the growth.


Patent
Sumitomo Metal Mining Co. | Date: 2016-11-16

In order to recover high-quality scandium from nickel oxide ores efficiently, this method comprises: a leaching step (S1) for feeding Ni oxide ores and sulfuric acid into a pressure vessel, and subjecting the mixture to solid-liquid separation to form a leachate and a leach residue; a neutralization step (S2) for adding a neutralizing agent to the leachate, and thus forming a neutralization sediment and a post-neutralization fluid; a sulfurization step (S3) for adding a sulfurizing agent to the post-neutralization fluid, and separating the obtained mixture into Ni sulfide and a post-sulfurization fluid; an ion-exchange step (S4) for bringing the post-sulfurization fluid into contact with a chelating resin, making Sc adsorbed on the chelating resin, and forming an Sc eluent; a solvent extraction step (S6) for bringing the Sc eluent into contact with an extracting agent, adding a back-extraction agent to the extract, and thus forming back-extracted matter; and a roasting step (S8) for roasting the back-extracted matter, and thus forming Sc oxide. It is preferable that the method further includes, after the ion exchange step (S4), a concentration step (S5) for forming a sediment from the Sc eluent and dissolving the sediment in an acid, and includes, after the solvent extraction step (S6), an Sc precipitation step (S7) for dissolving the back-extracted matter in hydrochloric acid, adding oxalic acid to the obtained solution, and thus forming Sc oxalate crystals.


A conductive substrate includes a transparent base material; a metal layer formed on at least one of surfaces of the transparent base material; and a blackened layer formed on the metal layer by a wet method.


There are provided a heat ray-shielding film having excellent heat-shielding performance and a color tone, and capable of exhibiting a weather resistance, a heat ray-shielding laminated transparent base material and a heat ray-shielding resin sheet material using this heat ray-shielding film, an automobile having these heat ray-shielding laminated transparent base material and heat ray-shielding resin sheet material used as window materials, and a building having these heat ray-shielding laminated transparent base material and heat ray-shielding resin sheet material as window materials, the heat ray-shielding film and the heat ray-shielding resin sheet material being expressed by a general formula M_(y)WO_(z), and containing a composite tungsten oxide particle having a hexagonal crystal structure, a selected wavelength absorbing material, and a thermoplastic resin, wherein the selected wavelength absorbing material has a transmission profile in which a transmittance of a light of a wavelength of 420 nm can be set to 40% or less when a transmittance of a light of a wavelength of 550 nm is 90% or more, and a transmittance of a light of a wavelength of 460 nm is 90% or more.

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