Engulfed nano/micro bubbles for improved recovery of large particles in a flotation cell
US10315202B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 2015 |
| Grant date | Jun 11, 2019 |
| Priority date | — |
| Expiry date | Apr 10, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB03D1/16
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of recovering particles from a liquid, a froth flotation apparatus, and a method of recovering particles in a flotation cell are disclosed. In an embodiment, the method comprises a technique of exposing the particles to first-size bubbles having a first predetermined size; the first-size bubbles adhering to the particles; and exposing the particles in a liquid, with the first-size bubbles adhering to the particles, to second-size bubbles having a second predetermined size, the second predetermined size being at least approximately ten times larger than the first predetermined size. The method further comprises the second-size bubbles adhering to the particles and engulfing the first-size bubbles on the particles; and using the second-size bubbles adhering to the particles to recover the particles from the liquid. In one embodiment a first surfactant is used to form the first-size bubbles, and a second surfactant is used to form the second-size bubbles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.