Spalling composite particles and methods of using them
US11077422B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2018 |
| Grant date | Aug 3, 2021 |
| Priority date | — |
| Expiry date | Jun 14, 2038 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/8891
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Composite particles contain a natural stone or aggregate core and a coating of two or more sorbent layers collectively containing at least two distinct kinds of sorbent materials effective for sorbing two distinct contaminants. One or both sorbent layers may be mixed with a water-absorbent, swellable clay that, upon contact with water, causes spalling or disintegration of the coating layer to release the sorptive material into a body of water such as a pond, ditch, stream, or riverbed. Additional swellable or protective layers may also be present. The composite particles are deployed into a pond, ditch, river, or streambed where the core of natural stone remains in the riverbed. The sorptive materials of the two different sorbent layers sorb and fix a wide range of contaminants, including both the heavy and light-weight hydrocarbons, from the water, and settle as a fine sediment. The sediment with sorbed contaminants is then removed by means such as hydraulic collectors or dredging.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.