Separation of fibre pulp suspensions containing relatively heavy contaminants
US7404492B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 2005 |
| Grant date | Jul 29, 2008 |
| Priority date | — |
| Expiry date | Jun 2, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB04C2009/008
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A hydrocyclone unit for separating a fibre pulp suspension containing relatively heavy contaminants has an elongate tapering separation chamber, an inlet member that feeds the suspension tangentially into the separation chamber at a base end, so as to form a vortex in the separation chamber, a reject fraction outlet at the apex end of the separation chamber for discharging a reject fraction containing heavy contaminants, and a central accept fraction outlet at the base end for discharging a central fraction containing fibres. A fluid injection member is adapted to inject a fluid tangentially into the separation chamber at a distance from the apex end which is at least 40% of the length of the separation chamber, such that the injected fluid increases the rotational speed of a portion of the vortex in the chamber to increase the separation efficiency with respect to fibres existing in the vortex portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.