Aspectos cinéticos de la formación de arseniato férrico en lecho fijo mediante reacciones gas-sólido

Eduardo Balladares, Roberto Parra, Mario Sánchez

Resultado de la investigación: Article

1 Cita (Scopus)

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.

Idioma originalSpanish
Páginas (desde-hasta)90-95
Número de páginas6
PublicaciónDYNA (Colombia)
Volumen82
N.º189
DOI
EstadoPublished - 2015

Huella dactilar

Kinetics
Porosity
Arsenic
Gases
Activation energy
Iron oxides
Density (specific gravity)
Contacts (fluid mechanics)
Industrial applications
Sintering
Oxides
Oxygen

ASJC Scopus subject areas

  • Engineering(all)

Citar esto

Balladares, Eduardo ; Parra, Roberto ; Sánchez, Mario. / Aspectos cinéticos de la formación de arseniato férrico en lecho fijo mediante reacciones gas-sólido. En: DYNA (Colombia). 2015 ; Vol. 82, N.º 189. pp. 90-95.
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abstract = "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.",
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Aspectos cinéticos de la formación de arseniato férrico en lecho fijo mediante reacciones gas-sólido. / Balladares, Eduardo; Parra, Roberto; Sánchez, Mario.

En: DYNA (Colombia), Vol. 82, N.º 189, 2015, p. 90-95.

Resultado de la investigación: Article

TY - JOUR

T1 - Aspectos cinéticos de la formación de arseniato férrico en lecho fijo mediante reacciones gas-sólido

AU - Balladares, Eduardo

AU - Parra, Roberto

AU - Sánchez, Mario

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

KW - Arsenic fixation

KW - Copper smelting

KW - Flue dust

KW - Gas treatment

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