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- Title
MODELACIÓN DE UNA BURBUJA OXIDANTE EN LA ETAPA DE DESULFURIZACIÓN DE COBRE BLISTER.
- Authors
Manríquez, Jorge; Vargas, Cristián; Droguett, Juan P.
- Abstract
The rise of an air and air enriched bubble in blister copper was modeled using COMSOL Multiphysics 5.3a software, with the aim of understanding the behavior of mass transfer by convective effect. The geometry consists of two subdomains, one assigned to blister copper that initially contains 1 [%] of dissolved sulfur and 0.5 [%] of dissolved oxygen and another one of air and air bubble enriched 30 and 40% of oxygen. To model the transfer of the species, the Chemical Engineering interfaces were used where the governing equations and the initial and contour conditions were defined. For the fluid flow, the equation of conservation of momentum plus the equation of continuity in laminar regime were used since it presented better resolution for the ascent velocity. For mass transport in the bubble Stefan - Maxwell equations for concentrated species were used, and for the transport of mass in molten copper the Fick Law for diluted species was used. The results of the model report the velocity profiles and concentrations of oxygen and sulfur dioxide in the bubble and concentrations of sulfur and oxygen dissolved in the blister copper. After the post-processing and analysis of results, it is concluded that the desulfurization of blister copper is controlled by the transfer of oxygen inside the bubble from its bulk to the reaction interface. The convective effect due to the rise of the bubble in the molten bath leads to a low rate of sulfur removal and oxygen dissolution of the bath on the upper and lateral surfaces of the bubble, while favoring the removal of sulfur and oxygen dissolution in the lower part where a wake is formed. With the increase of oxygen enrichment, the time in which the oxygen is depleted increases and this greater mass of oxygen removes more sulfur from the bath and dissolves more oxygen.
- Subjects
DESULFURIZATION; MAXWELL equations; COLLECTIVE behavior; FLUID flow; CHEMICAL engineering; MASS transfer
- Publication
La Revista Latinoamericana de Metalurgia y Materiales, RLMM, 2019, Vol S8, Issue 1, p52
- ISSN
0255-6952
- Publication type
Article