Process for de-inking paper pulp and flotation cell used for this process
US7281631B2 · kind B2 · utility
0Cited by
3References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 14, 2004 |
| Grant date | Oct 16, 2007 |
| Priority date | — |
| Expiry date | Jul 18, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/64
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The cell includes an enclosure having, at the top, a main inlet for the pulp to be de-inked and, at the bottom, a main outlet for the de-inked pulp. The pulp from the top to the bottom, passes through successive stages provided with bubble passageways introduced into the lower portion of the enclosure, and the bubbles rise to the top, to form a foam. The cell includes pulp a guiding mechanism forming a guiding path and in which the bubble passageways are provided for. The guiding mechanisms are, on their lower face, inclined upwards in order to guide the bubbles towards the bubble passageways.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.