A degenerating convection-diffusion system modelling froth flotation with drainage
(2022) In IMA Journal of Applied Mathematics (Institute of Mathematics and Its Applications) 87(6). p.1151-1190- Abstract
- Froth flotation is a common unit operation used in mineral processing. It serves to separate valuable mineral particles from worthless gangue particles in finely ground ores. The valuable mineral particles are hydrophobic and attach to bubbles of air injected into the pulp. This creates bubble-particle aggregates that rise to the top of the flotation column where they accumulate to a froth or foam layer that is removed through a launder for further processing. At the same time, the hydrophilic gangue particles settle and are removed continuously. The drainage of liquid due to capillarity is essential for the formation of a stable froth layer. This effect is included into a previously formulated hyperbolic system of partial differential... (More)
- Froth flotation is a common unit operation used in mineral processing. It serves to separate valuable mineral particles from worthless gangue particles in finely ground ores. The valuable mineral particles are hydrophobic and attach to bubbles of air injected into the pulp. This creates bubble-particle aggregates that rise to the top of the flotation column where they accumulate to a froth or foam layer that is removed through a launder for further processing. At the same time, the hydrophilic gangue particles settle and are removed continuously. The drainage of liquid due to capillarity is essential for the formation of a stable froth layer. This effect is included into a previously formulated hyperbolic system of partial differential equations that models the volume fractions of floating aggregates and settling hydrophilic solids [R. Bürger, S. Diehl and M.C. Martí, IMA. J. Appl. Math. 84 (2019) 930–973]. The construction of desired steady-state solutions with a froth layer is detailed and feasibility conditions on the feed volume fractions and the volumetric flows of feed, underflow and wash water are visualized in so-called operating charts. A monotone numerical scheme is derived and employed to simulate the dynamic behaviour of a flotation column. It is also proven that, under a suitable Courant-Friedrichs-Lewy condition, the approximate volume fractions are bounded between zero and one when the initial data are. (Less)
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https://lup.lub.lu.se/record/deb82bcf-e0ed-4c29-826f-71cc5d62576c
- author
- Bürger, Raimund ; Diehl, Stefan LU ; Martí, María Del Carmen and Vasquéz, Yolanda
- organization
- publishing date
- 2022
- type
- Contribution to journal
- publication status
- published
- subject
- in
- IMA Journal of Applied Mathematics (Institute of Mathematics and Its Applications)
- volume
- 87
- issue
- 6
- pages
- 40 pages
- publisher
- Oxford University Press
- external identifiers
-
- scopus:85152459052
- ISSN
- 0272-4960
- DOI
- 10.1093/imamat/hxac033
- language
- English
- LU publication?
- yes
- id
- deb82bcf-e0ed-4c29-826f-71cc5d62576c
- date added to LUP
- 2024-10-08 15:07:38
- date last changed
- 2025-04-04 13:52:14
@article{deb82bcf-e0ed-4c29-826f-71cc5d62576c,
abstract = {{Froth flotation is a common unit operation used in mineral processing. It serves to separate valuable mineral particles from worthless gangue particles in finely ground ores. The valuable mineral particles are hydrophobic and attach to bubbles of air injected into the pulp. This creates bubble-particle aggregates that rise to the top of the flotation column where they accumulate to a froth or foam layer that is removed through a launder for further processing. At the same time, the hydrophilic gangue particles settle and are removed continuously. The drainage of liquid due to capillarity is essential for the formation of a stable froth layer. This effect is included into a previously formulated hyperbolic system of partial differential equations that models the volume fractions of floating aggregates and settling hydrophilic solids [R. Bürger, S. Diehl and M.C. Martí, IMA. J. Appl. Math. 84 (2019) 930–973]. The construction of desired steady-state solutions with a froth layer is detailed and feasibility conditions on the feed volume fractions and the volumetric flows of feed, underflow and wash water are visualized in so-called operating charts. A monotone numerical scheme is derived and employed to simulate the dynamic behaviour of a flotation column. It is also proven that, under a suitable Courant-Friedrichs-Lewy condition, the approximate volume fractions are bounded between zero and one when the initial data are.}},
author = {{Bürger, Raimund and Diehl, Stefan and Martí, María Del Carmen and Vasquéz, Yolanda}},
issn = {{0272-4960}},
language = {{eng}},
number = {{6}},
pages = {{1151--1190}},
publisher = {{Oxford University Press}},
series = {{IMA Journal of Applied Mathematics (Institute of Mathematics and Its Applications)}},
title = {{A degenerating convection-diffusion system modelling froth flotation with drainage}},
url = {{http://dx.doi.org/10.1093/imamat/hxac033}},
doi = {{10.1093/imamat/hxac033}},
volume = {{87}},
year = {{2022}},
}