Gypsum additive to control mercury
US10654753B2 · kind B2 · utility
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Key dates
| Filing date | Aug 7, 2017 |
| Grant date | May 19, 2020 |
| Priority date | — |
| Expiry date | Aug 7, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B24/38
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Additives including sulfur-containing compounds are used in methods of treating synthetic gypsum. The additives can thermally stabilize heavy metals, such as mercury. This thermal stabilization reduces mercury release from the synthetic gypsum. Illustrative, non-limiting examples of sulfur-containing compounds include inorganic sulfides, organic sulfides, organic compounds containing nitrogen and sulfur, organic compounds containing oxygen and sulfur, and polymers containing sulfur.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.