Method for making foam glass from diatomaceous earth and fly ash
US4430108A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 14, 1982 |
| Grant date | Feb 7, 1984 |
| Priority date | — |
| Expiry date | Sep 14, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249969
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of making foam glass by impregnating diatomaceous earth, fly ash or mixtures thereof, and insoluble modifiers, if any, with at least one water soluble glass former in an amount expressed as its oxide of about 2.5 to 20 weight percent of the impregnated diatomaceous earth, fly ash or mixtures thereof; at least one water soluble flux in an amount expressed as its oxide of about 8 to 20 weight percent of the impregnated diatomaceous earth, fly ash or mixtures thereof; and at least one gas generator. The diatomaceous earth, fly ash or mixtures thereof is impregnated by mixing diatomaceous earth, fly ash or mixtures thereof and an impregnating solution comprising at least one water soluble glass former in an amount expressed as its oxide of about 3 to 14 weight percent; at least one water soluble flux in an amount expressed as its oxide of about 10 to 20 weight percent; at least one gas generator, and water in an amount of about 50 to 80 weight percent. Excess impregnating solution is removed and the impregnated diatomaceous earth, fly ash or mixtures thereof is heated to a sufficient temperature, generally about 720.degree. to 1000.degree. C., to cause foaming of the impregnat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.