Abstract
Research was performed to evaluate copper and silver extraction from samples of bornite flotation concentrate. Sulfation roasting experiments were performed in a rotary tube furnace, a fluidized bed reactor, and a static bed muffle furnace. Roasting was plagued with rapid, low-temperature calcine sintering, apparently related to the presence of organic matter in the concentrate. Calcine entered a weak acid leaching process to remove copper, and silver was extracted from the weak acid leach residue in a ferric chloride and hydrochloric acid solution. Copper extraction efficiencies in excess of 90% were attained in the weak acid leach while 90% silver extraction was achieved in the ferric chloride leach, along with copper and lead extractions as high as 93% and 99% respectively. The two-stage leaching process resulted in overall extraction efficiencies of 99% copper and 90% silver.
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© 2015 TMS (The Minerals, Metals & Materials Society)
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Foy, R.J., Lloyd, S., Steinborn, B., Downey, J.P. (2015). Sulfation Roasting of a Bornite Flotation Concentrate to Optimize Silver Extraction in a Ferric Chloride Leach. In: Battle, T.P., et al. Drying, Roasting, and Calcining of Minerals. Springer, Cham. https://doi.org/10.1007/978-3-319-48245-3_1
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DOI: https://doi.org/10.1007/978-3-319-48245-3_1
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48600-0
Online ISBN: 978-3-319-48245-3
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