Methods of removing chloride from gypsum having high level of chloride salt
US11760689B2 · kind B2 · utility
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18Claims
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Key dates
| Filing date | Dec 9, 2021 |
| Grant date | Sep 19, 2023 |
| Priority date | — |
| Expiry date | Jan 26, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/0062
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Beads of materials such as activated alumina, zeolite and silica gel, are used as chloride salt absorbers. The beads are mixed with high-salt gypsum. After mixing for a short time, the mixtures are dried, and the beads and the powder are separated by using a sieve or other physical separation device resulting in a low-salt gypsum which can be used as a gypsum source to make gypsum wallboard.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.