GB675341A - Manufacture of finely divided silica - Google Patents
Manufacture of finely divided silicaInfo
- Publication number
- GB675341A GB675341A GB2522050A GB2522050A GB675341A GB 675341 A GB675341 A GB 675341A GB 2522050 A GB2522050 A GB 2522050A GB 2522050 A GB2522050 A GB 2522050A GB 675341 A GB675341 A GB 675341A
- Authority
- GB
- United Kingdom
- Prior art keywords
- silica
- collected
- formation
- silicon tetrafluoride
- finely divided
- 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
-
- 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
- C01B33/183—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by a dry process by oxidation or hydrolysis in the vapour phase of silicon compounds such as halides, trichlorosilane, monosilane
- C01B33/184—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by a dry process by oxidation or hydrolysis in the vapour phase of silicon compounds such as halides, trichlorosilane, monosilane by hydrolysis of tetrafluoride
-
- 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
- C01P2006/10—Solid density
-
- 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
- C01P2006/12—Surface area
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
Amorphous finely divided silica is produced by reacting silicon tetrafluoride vapour with steam at a temperature which prevents the formation of moisture, collecting the silica after its formation and maintaining the collected silica at a sufficiently high temperature, to prevent the formation of moisture therein, and until the hydrofluoric acid has been separated therefrom. Fluorite (CaF2), sand, and sulphuric acid are reacted to produce silicon tetrafluoride vapour, which is contacted with steam, and the resultant silica is collected in a bag filter. The hydrofluoric acid may be collected and passed through sand to produce silicon tetrafluoride for re-use in the process. The silica has a density of 4 pounds per cubic foot and a specific surface area of 100-200 sq. m. per gram.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2522050A GB675341A (en) | 1950-10-17 | 1950-10-17 | Manufacture of finely divided silica |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2522050A GB675341A (en) | 1950-10-17 | 1950-10-17 | Manufacture of finely divided silica |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB675341A true GB675341A (en) | 1952-07-09 |
Family
ID=10224152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2522050A Expired GB675341A (en) | 1950-10-17 | 1950-10-17 | Manufacture of finely divided silica |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB675341A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2805956A (en) * | 1952-05-28 | 1957-09-10 | Columbia Southern Chem Corp | Silica pigment and method of preparing same |
| US3123497A (en) * | 1964-03-03 | Process for depositing silicon dioxide dielectric coatings |
-
1950
- 1950-10-17 GB GB2522050A patent/GB675341A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3123497A (en) * | 1964-03-03 | Process for depositing silicon dioxide dielectric coatings | ||
| US2805956A (en) * | 1952-05-28 | 1957-09-10 | Columbia Southern Chem Corp | Silica pigment and method of preparing same |
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