6533b85dfe1ef96bd12bf14f
RESEARCH PRODUCT
Flotation with sedimentation: Steady states and numerical simulation of transient operation
Yolanda VásquezStefan DiehlRaimund BürgerM. C. Martísubject
Conservation lawPartial differential equationMaterials scienceComputer simulationSedimentation (water treatment)Mechanical EngineeringNumerical analysis02 engineering and technologyGeneral ChemistryMechanics010501 environmental sciencesGeotechnical Engineering and Engineering Geology01 natural sciences020501 mining & metallurgyPhysics::Fluid DynamicsNonlinear system0205 materials engineeringControl and Systems EngineeringSlurryFroth flotation0105 earth and related environmental sciencesdescription
Abstract A spatially one-dimensional model of the hydrodynamics of a flotation column is based on one continuous phase, the fluid, and two disperse phases: the aggregates, that is, bubbles with attached hydrophobic valuable particles, and the solid particles that form the gangue. A common feed inlet for slurry mixture and gas is considered and the bubbles are assumed to be fully aggregated with hydrophobic particles as they enter the column. The conservation law of the three phases yields a model expressed as a system of partial differential equations where the nonlinear constitutive flux functions come from the drift-flux and solids-flux theories. In addition, the total flux functions are discontinuous in the spatial (height) coordinate because of two inlets (slurry and wash water) and outlets at the top and bottom. The desired stationary solutions of this model can be characterized by operating charts. A novel numerical method is used for simulations of the hydrodynamics under variable operating conditions such as control actions that drive the process to desired states of operation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-10-01 | Minerals Engineering |