Method and apparatus for magnetic separation of particles in a fluid carrier
US4102780A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1976 |
| Grant date | Jul 25, 1978 |
| Priority date | — |
| Expiry date | Mar 9, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB03C1/26
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Particles suspended in a fluid carrier are differentially separated by, first, grading the particles into fractions of equal settling rates and, second, separating the equal-settling particles of each fraction according to the magnetic susceptibilities of the particles. The particulate sample to be separated is passed through a two-path parallel flow system. In one path, the sample is selectively graded, by elutriation, into equal-settling fractions. Each such fraction then flows directly to the second path, where it crosses a magnetic field at a velocity proportional to its settling rate. Such proportionality between settling rate and flow velocity provides a residence time which ensures that the degree of deflection, in response to gravitational and magnetic forces, required for separate recovery of magnetic particles, on the one hand, and non-magnetic particles, on the other hand, will be attained within the active length of the magnetic field. Provision is made for simultaneous adjustment of the flow rates in the respective paths, thereby allowing selection among fractions of different settling rates while, at the same time, maintaining the desired flow rate proportionality bet…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.