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Partial Roasting of High-Arsenic Copper Concentrates

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Abstract

The partial roasting of high-arsenic copper concentrates at 973 K/998 K (700 °C/725 °C) under controlled atmosphere can remove > 95 pct of the arsenic contained in the concentrates, leaving a calcine with 52 to 68 wt pct bornite, 10 to 13 wt pct chalcopyrite and 2 to 5 wt pct magnetite, with 8 to 24 wt pct remnant chalcocite. The mineralogic composition of the calcine obtained is consistent with the calculated mineralogic composition based on the chemical analysis of the calcine and the gaseous phase in equilibrium with the calcine. The formation of the new solid phases present in the calcine (bornite and chalcopyrite) should take place in the emulsion phase of the fluidized bed, while the oxidation of part of the gaseous sulfur generated by thermal decomposition of the sulfides present in the concentrate could occur in the evolving cloud and wake surrounding the air bubbles in the emulsion phase of the fluidized bed.

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Abbreviations

D :

Diffusion coefficient of oxygen at 973 K, ~ 0.15 cm2/s

\( \bar{d}_{\text{p}} \) :

Average particle diameter = 5 × 10−3 cm

\( \bar{d}_{\text{b}} \) :

Average gas bubble diameter = 6 cm

g :

Acceleration of gravity, 980.6 cm/s

Kbe, Kbc, Kcc :

Mass exchange coefficients of gas between bubble and emulsion, bubble and cloud + wake and cloud + wake and emulsion, (1/s)

T :

Temperature (°C)

\( \bar{t} \) :

Average reaction time of solids in the bed, (h)

u br :

Velocity of gas bubbles, 54 cm/s

u mf :

Minimum fluidizing velocity, 5.5 cm/s

\( \varepsilon_{\text{mf}} \) :

Bed porosity at minimum fluidizing velocity, 0.25 (-)

\( \bar{\rho }_{\text{s}} \) :

Average density of solids = 4.5 g/cm3 = 3.58 × 10−2 mole/cm3

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Acknowledgements

The authors thank the DMH Division of CODELCO for permission to publish the experimental data and also Conicyt/PIA for additional support through the CCTE AFB170007 program.

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Authors and Affiliations

  1. Department of Metallurgical Engineering and Unidad de Desarrollo Tecnológico UDT, University of Concepción, E. Larenas 285, 4070371, Concepción, Chile

    Igor Wilkomirsky

  2. Department of Metallurgical Engineering, University of Concepción, E. Larenas 285, 4070371, Concepción, Chile

    Roberto Parra, Fernando Parada & Eduardo Balladares

  3. DMH Division of CODELCO, Calama Road, Km. 5, 8340424, Calama, Chile

    Jorge Etcheverry & Rodrigo Díaz

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  1. Igor Wilkomirsky
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Correspondence to Igor Wilkomirsky.

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Manuscript submitted April 2, 2019.

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Wilkomirsky, I., Parra, R., Parada, F. et al. Partial Roasting of High-Arsenic Copper Concentrates. Metall Mater Trans B 51, 2030–2038 (2020). https://doi.org/10.1007/s11663-020-01893-x

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