Method and unit for regeneration of solution for cleaning glass, method and unit for cleaning silicate glass, and cathode-ray tube
US6521575B1 · kind B1 · utility
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2References
17Claims
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Key dates
| Filing date | Apr 6, 2000 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | Apr 6, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C23/0075
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A treatment solution (2) containing fluoride is added to a cleaning solution (1) drained from a cleaning tank (11). Fluoride is allowed to react with fluorosilicic acid in the cleaning solution to settle a precipitate (4) containing fluorosilicate, and the precipitate (4) is removed. The cleaning solution regenerated in a regeneration apparatus (10) is again returned to the cleaning tank (11), and used as a cleaning solution for a CRT panel (20).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.