GB1286952A - Method of preparing finely-divided solids - Google Patents
Method of preparing finely-divided solidsInfo
- Publication number
- GB1286952A GB1286952A GB38647/68A GB3864768A GB1286952A GB 1286952 A GB1286952 A GB 1286952A GB 38647/68 A GB38647/68 A GB 38647/68A GB 3864768 A GB3864768 A GB 3864768A GB 1286952 A GB1286952 A GB 1286952A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oxide
- sio
- core
- gas
- vapour
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/14—Methods for preparing oxides or hydroxides in general
- C01B13/20—Methods for preparing oxides or hydroxides in general by oxidation of elements in the gaseous state; by oxidation or hydrolysis of compounds in the gaseous state
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/90—Carbides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/90—Carbides
- C01B32/914—Carbides of single elements
- C01B32/956—Silicon carbide
- C01B32/963—Preparation from compounds containing silicon
- C01B32/97—Preparation from SiO or SiO2
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
- C01B33/181—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by a dry process
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/10—Particle morphology extending in one dimension, e.g. needle-like
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/32—Spheres
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Nanotechnology (AREA)
- General Physics & Mathematics (AREA)
- Composite Materials (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Carbon And Carbon Compounds (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Oxygen, Ozone, And Oxides In General (AREA)
Abstract
1286952 Oxides; finely-divided solids NATIONAL RESEARCH DEVELOPMENT CORP 7 Aug 1969 [13 Aug 1968] 38647/68 Headings C1A and C1N [Also in Division F4] A finely divided solid is made by heating, using a high-temperature and high-enthalpy gas stream, a melt containing a non-volatile inorganic oxide or a precursor thereof centrifugally distributed on the inner surface of a hollow rotating body, so as to produce a non- volatile inorganic oxide in the vapour phase and then condensing the oxide, or a species derived therefrom, by chemical and/or physical modification, in a finely divided form. A precursor is defined as a material from which the oxide is readily derived, e.g. an oxalate or nitrate. The hot gas may be a plasma jet or an electricallyaugmented chemical flame. The melt may contain an additive designed to aid volatilization, e.g. carbon or a free metal. The process may be conducted in a so-called centrifugal liquid-wall furnace. In one embodiment, a water-cooled steel tube 1 contains a rotatable core 2 of the material to be melted and vaporized. The core is heated by gas from plasma jet 3 provided with nozzles 4 for injection of further raw material if continuous operation is desired. Water-cooled quenching section 6 is provided with radially-directed tubes 8 for inlet of quenching gas. The outlet 9 of the quenching section feeds tangentially into electrostatic precipitator 10 comprising a tube 11 and electrostatically charged tungsten wave 12. The size of the particles, e.g. less than 2000 , is determined by the rate of gas flow and the positioning of the gas jets. The oxide may be a refractory such as alumina, zirconia, titania, chromium oxides, thoria, magnesia, silica, manganese oxide, zinc oxide or eerie oxide. Modification may be effected by introducing a reactive gas into the oxide vapour. For example, a carbon-containing gas, e.g. methane, may be fed into SiO or SiO 2 vapour to produce SiC, and NH 3 or N 2 /H 2 mixture may be fed in to form nitrides. A lower oxide may be converted to a higher oxide by reaction with Al 2 or O 2 . Further modification may be effected during quenching. By introducing H 2 O vapour (as such, or produced in situ by oxidation of H 2 derived from the plasma jet), a product with a hydroxylated surface may be obtained. Alternatively an organic vapour, e.g. methanol, may be used to impart hydrophobic properties. Hydroxylated SiO 2 may be further modified by reaction with methyl chloride or trimethyl silyl chloride. In examples: (1) fibres of 70% SiO, 30% SiO 2 are made from a furnace core of an equimolecular mixture of fused quartz and coke; (2) spherical alumina particles are made from a coke: alumina (1 : 2) core, the lower oxides evaporated being oxidized to Al 2 O 3 by a stream of air; (3) spherical TiO 2 particles (rutile) are made from a TiO 2 : coke core, the TiO vaporized being oxidized to TiO 2 by a stream of air; (4) cubic MgO particles are made from a core of mag nesia and coke; (5) surface-hydroxylated magnesia is made by quenching vaporized MgO in water vapour; (6) silicon carbide is made by evaporating SiO from a SiO 2 : coke core, and reacting in the vapour phase with methane.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB38647/68A GB1286952A (en) | 1968-08-13 | 1968-08-13 | Method of preparing finely-divided solids |
CA058747A CA933335A (en) | 1968-08-13 | 1969-08-06 | Method of preparing finely-divided solids |
DE1941011A DE1941011C3 (en) | 1968-08-13 | 1969-08-12 | Process for the production of finely divided high-melting inorganic products |
MY1974114A MY7400114A (en) | 1968-08-13 | 1974-12-31 | Method of preparing finely-divided solids |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB38647/68A GB1286952A (en) | 1968-08-13 | 1968-08-13 | Method of preparing finely-divided solids |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1286952A true GB1286952A (en) | 1972-08-31 |
Family
ID=10404811
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB38647/68A Expired GB1286952A (en) | 1968-08-13 | 1968-08-13 | Method of preparing finely-divided solids |
Country Status (4)
Country | Link |
---|---|
CA (1) | CA933335A (en) |
DE (1) | DE1941011C3 (en) |
GB (1) | GB1286952A (en) |
MY (1) | MY7400114A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007025235A1 (en) * | 2005-08-26 | 2007-03-01 | Ppg Industries Ohio, Inc. | Method and apparatus for the production of ultrafine silica particles from solid silica powder and related coating compositions |
US7758838B2 (en) | 2006-08-18 | 2010-07-20 | Ppg Industries Ohio, Inc. | Method and apparatus for the production of ultrafine particles and related coating compositions |
CN102786205A (en) * | 2012-08-21 | 2012-11-21 | 连云港国瑞电子石英有限公司 | Rotating centrifuging melting forming method for quartz product as well as rotating furnace |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996006700A2 (en) * | 1994-08-25 | 1996-03-07 | Qqc, Inc. | Nanoscale particles, and uses for same |
US5856254A (en) * | 1996-02-15 | 1999-01-05 | Vaw Silizium Gmbh | Spherical metal-oxide powder particles and process for their manufacture |
-
1968
- 1968-08-13 GB GB38647/68A patent/GB1286952A/en not_active Expired
-
1969
- 1969-08-06 CA CA058747A patent/CA933335A/en not_active Expired
- 1969-08-12 DE DE1941011A patent/DE1941011C3/en not_active Expired
-
1974
- 1974-12-31 MY MY1974114A patent/MY7400114A/en unknown
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007025235A1 (en) * | 2005-08-26 | 2007-03-01 | Ppg Industries Ohio, Inc. | Method and apparatus for the production of ultrafine silica particles from solid silica powder and related coating compositions |
US7695705B2 (en) | 2005-08-26 | 2010-04-13 | Ppg Industries Ohio, Inc. | Method and apparatus for the production of ultrafine silica particles from solid silica powder and related coating compositions |
US7758838B2 (en) | 2006-08-18 | 2010-07-20 | Ppg Industries Ohio, Inc. | Method and apparatus for the production of ultrafine particles and related coating compositions |
CN102786205A (en) * | 2012-08-21 | 2012-11-21 | 连云港国瑞电子石英有限公司 | Rotating centrifuging melting forming method for quartz product as well as rotating furnace |
Also Published As
Publication number | Publication date |
---|---|
CA933335A (en) | 1973-09-11 |
DE1941011B2 (en) | 1978-08-31 |
DE1941011A1 (en) | 1970-02-19 |
MY7400114A (en) | 1974-12-31 |
DE1941011C3 (en) | 1979-05-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
429A | Application made for amendment of specification (sect. 29/1949) | ||
429H | Application (made) for amendment of specification now open to opposition (sect. 29/1949) | ||
429D | Case decided by the comptroller ** specification amended (sect. 29/1949) | ||
PCNP | Patent ceased through non-payment of renewal fee |