Froth flotation apparatus and method
US5022984A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1990 |
| Grant date | Jun 11, 1991 |
| Priority date | — |
| Expiry date | Feb 28, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/64
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Apparatus for separating contaminant particles from liquid suspension stock, e.g. in the de-inking of used news print, is characterized by one or more of a plurality of features which contribute to increasing the capacity and effectiveness of the apparatus, including the provision of a cell comprising inner and outer annular chambers of substantially equal depth with the inlet and outlet connections for the stock being located adjacent the bottoms of the two chambers to force the stock to travel through the full depth of each chamber, and also the provision of a baffle of substantial width on the top of the wall between the two chambers to spread the stock overflowing that wall into a thin film. Other features include the use of an explosion-type flowbox to aerate the stock as it is delivered to froth flotation apparatus, and the provision of a variety of alternative constructions for spreading aerated grey stock into a film and causing that film to flow a substantial distance in a substantially horizontal plane in order to minimize the distance for travel of bubbles in the stock to the top of the film and thereby to expedite the resulting formation of a layer of froth at top of th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.