# US 2024/0182318 A1 · Metal oxide powder, and method for producing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0182318 A1 - Document ID: US20240182318A1 - Status: Published application - Kind: A1 - Application number: 18/282,440 - Filed: 2022-03-22 - Published: 2024-06-06 - Earliest claimed: 2021-03-31 - Assignees: Denka Company Limited - Applicants: Denka Company Limited - Inventors: Takaaki MINAMIKAWA; Hiroyuki SHIOTSUKI; Koji MIYAZAKI - Web page: https://patentgrep.com/patent/US20240182318A1 ## CPC - C01F 7/46: Purification of aluminium oxide, aluminium hydroxide or aluminates (C01F7/028 takes precedence) - C01B 33/18: Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof (preparation of aerogels by dehydrating gels C01B33/158; treatment to enhance the pigmenting or filling properties C09C) - C01B 33/181: {by a dry process} - C01P 2004/32: Spheres - C01P 2004/51: Particles with a specific particle size distribution - C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer - C01P 2006/12: Surface area - C01P 2006/80: Compositional purity - C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00}) - C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C} - C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS ## Abstract A metal oxide powder in which the metal is other than uranium, iron and titanium, and, in the metal oxide powder, the content rate of uranium is 1.0 ppb by mass or less, the content rate of iron is 100 ppm by mass or less in terms of Fe2O3, the content rate of titanium in terms of TiO2 oxide is 8 ppm by mass or less. Included is a method of producing a metal oxide powder which removes impurities from a metal oxide powder so that a metal oxide powder having a high purity can be obtained, and a metal oxide powder produced according to the method. ## Claims ### Claim 1 A method of producing a metal oxide powder, comprising a heating step in the presence of a halogen, which heats a metal oxide in the presence of a halogen. ### Claim 2 (depends on 1) The method of producing a metal oxide powder according to claim 1, wherein the halogen is chlorine. ### Claim 3 (depends on 1) The method of producing a metal oxide powder according to claim 1, further comprising, after the heating step in the presence of a halogen, a first heating step at reduced pressure, which heats the metal oxide at reduced pressure. ### Claim 4 (depends on 3) The method of producing a metal oxide powder according to claim 3, wherein a cycle composed of the heating step in the presence of a halogen and the first heating step at reduced pressure is repeated two times or more. ### Claim 5 (depends on 1) The method of producing a metal oxide powder according to claim 1, further comprising a heating step in the presence of an inert gas, which heats the metal oxide in the presence of an inert gas. ### Claim 6 (depends on 5) The method of producing a metal oxide powder according to claim 5, wherein the heating temperature of the heating step in the presence of an inert gas is higher than the heating temperature of the heating step in the presence of a halogen. ### Claim 7 (depends on 5) The method of producing a metal oxide powder according to claim 5, further comprising, after the heating step in the presence of an inert gas, a second heating step at reduced pressure which heats the metal oxide at reduced pressure. ### Claim 8 (depends on 7) The method of producing a metal oxide powder according to claim 7, wherein a cycle composed of the heating step in the presence of an inert gas and the second heating step at reduced pressure is repeated two times or more. ### Claim 9 (depends on 1) The method of producing a metal oxide powder according to claim 1, wherein the heating temperature of the heating step in the presence of a halogen is such a temperature that impurities to be aimed react with a halogen to become halides. ### Claim 10 (depends on 1) The method of producing a metal oxide powder according to claim 1, wherein the metal oxide is at least one selected from the group consisting of silicon dioxide and aluminum oxide. ### Claim 11 A metal oxide powder, wherein the metal is a metal other than uranium, iron and titanium, and, in the metal oxide powder, the content rate of uranium is 1.0 ppb by mass or less, the content rate of iron is 100 ppm by mass or less in terms of Fe2O3, and the content rate of titanium in terms of TiO2 is 8 ppm by mass or less.