Making a pelletized glass batch for soda-lime glass manufacture
US4026691A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1975 |
| Grant date | May 31, 1977 |
| Priority date | — |
| Expiry date | Nov 3, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P40/50
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention pertains to improvements in the manufacture of soda-lime glass from pelletized glass batch material in which a major portion of the alkali metal oxide flux material (e.g. Na.sub.2 O) in the final glass is derived from an alkali metal hydroxide (e.g. NaOH) and in which the alkali metal hydroxide is reacted with alkaline earth metal oxide source material during the preparation of the pelletized glass batch material. The improvements are obtained by reacting aqueous, concentrated, alkali metal hydroxide with at least a portion of the alkaline earth metal oxide source material (e.g. limestone) to form an aqueous slurry which contains the reaction products, then mixing with the slurry the remaining glass batch materials under conditions to assure thorough mixing and then pelletizing and heating the batch material at a temperature of at least about 145.degree. C to assure substantially complete drying of the pellets and substantially complete reaction of the alkali metal hydroxide. Pellets thus made produce a more consistent batch material for feeding into a melting vessel in which molten glass is formed. The invention provides not only a more efficient glass making proces…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.