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Kinetic aspects on ferric arsenate formation in a fix bed gas-solid reaction system

Balladares, Eduardo and Parra, Roberto and Sánchez, Mario (2015) Kinetic aspects on ferric arsenate formation in a fix bed gas-solid reaction system. DYNA, 82 (189). pp. 90-95. ISSN 2346-2183

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Resumen

The fixation of arsenic contained in gases produced during pyrometallurgical processes by using solid ferric oxide was studied in the range 873-1073 K under different oxygen potential and solid aggregates porosities. Arsenic fixation on solid iron oxides is described by the pore blocking model under the studied conditions. The solid product of the reaction has a molar volume 3 times larger than the solid reactant causing fast decreasing of the inter-granular spacing. The activation energies of arsenic fixation reaction are 34.96 and 35.46 kJ/mol for porosities of 0.88 and 0.74 respectively, and for porosity of 0.55 the activation energy was 26.88 kJ/mol. These values of activation energy show that intra-pellets diffusion has an effect only in samples with 0.55 porosity. Minor sintering of particles was detected. Industrial application of the concept demands a reaction system, which in is required better gas-solid contact for attaining larger conversions.

Tipo de documento:Artículo - Article
Palabras clave:arsenic fixation, flue dust, gas treatment, copper smelting.
Temática:6 Tecnología (ciencias aplicadas) / Technology > 62 Ingeniería y operaciones afines / Engineering
Unidad administrativa:Revistas electrónicas UN > Dyna
Código ID:59100
Enviado por : Dirección Nacional de Bibliotecas STECNICO
Enviado el día :31 Oct 2017 17:20
Ultima modificación:27 Noviembre 2017 22:07
Ultima modificación:27 Noviembre 2017 22:07
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