Process for the preparation of calcium carbonate for use in fluorescent lamp phosphors
US4100264A · kind A · utility
5Cited by
1References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1976 |
| Grant date | Jul 11, 1978 |
| Priority date | — |
| Expiry date | Dec 23, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F11/185
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of producing finely-divided phosphor grade calcium carbonate having a calcite crystalline structure and a very low sodium content. The calcium carbonate is produced from calcium chloride having a high sodium impurity content, such as calcium chloride which is a by-product of the Solvay process for producing soda ash.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.