Regenerating method and system for fluorescent material
US6042748A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1998 |
| Grant date | Mar 28, 2000 |
| Priority date | — |
| Expiry date | Feb 6, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/50
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for regenerating a fluorescent material from a recovered phosphor slurry characterized by including a chemical washing step wherein a hypochlorite and a periodate are used; a carbon removing step for floating carbon in the supernatant liquid by the use of ammonia thereby removing the carbon; an acid washing step; and a heat treating step in this order as well as a system for regenerating a fluorescent material comprising means for effecting the aforesaid steps. From this constitution, it becomes possible that impurities are easily and effectively removed from the recovered phosphor slurry, whereby a fluorescent material providing excellent luminance and excellent grade of phosphor film can be regenerated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.