Method for reducing elemental sulfur in gypsum products
US9656876B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 2015 |
| Grant date | May 23, 2017 |
| Priority date | — |
| Expiry date | Nov 3, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Disclosed are various methods for reducing levels of elemental sulfur within gypsum products such as wall board. Gypsum sometimes includes increased levels of elemental sulfur. Such sulfur can be corrosive and otherwise harmful at elevated levels. The disclosure contemplates reacting the elemental sulfur with copper to copper sulfide. This reaction has the benefit of reducing the levels of elemental sulfur present within the final gypsum product. The copper can be added at any of a variety of locations in the manufacturing process. This is a very efficient method for reducing elemental sulfur in the production of gypsum products.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.