High-gradient magnetic separator
US4772383A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 30, 1982 |
| Grant date | Sep 20, 1988 |
| Priority date | — |
| Expiry date | Aug 30, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB03C2201/18
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A high-gradient magnetic separator is provided for filtrating weakly magnetic particles from a fluid in which they are suspended. The fluid is caused to flow through a separation chamber arranged in a gap in a magnetic circuit which comprises a pair of separate permanent magnetic devices connected by means of yoke members of a magnetic soft material. Permanent magnet devices generate a strong magnetic field in the gap with very small magnetic losses. Each permanent magnetic device comprises a permanent magnetic member with a substantially linear demagnetization curve. A matrix of magnetic soft material is disposed in the gap between pole surfaces of the permanent magnetic devices to create high local magnetic gradients. To facilitate cleaning of the matrix filter material, the separation chamber is formed as a displaceable box-shaped cannister. A series arrangement of two such canisters with an intermediate dummy load creates a favorable duty cycle, with one cannister operating in filtration mode and the other displaced outside the gap for cleaning the matrix material. Substantially zero magnetic losses occur with each permanent magnetic device of a pole shoe member being formed of…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.