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Accelerating Copper Leaching from Sulfide Ores in Acid-Nitrate-Chloride Media Using Agglomeration and Curing as Pretreatment

Pía C. Hernández, Junior Dupont, Pí a C. Hern á ndez

2019esleachingcoppersulfide oresagglomerationcuringchalcopyritecopper leachingnitratechlorideheap leaching

Abstract

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This work investigates the effect of an agglomeration and curing pretreatment on leaching of a copper sulfide ore, mainly chalcopyrite, using mini-columns in acid-nitrate-chloride media. Ten pretreatment tests were conducted to evaluate different variables, namely the addition of nitrate as NaNO3 (11.7 and 23.3 kg/ton), chloride as NaCl (2.1 and 19.8 kg/ton), curing time (20 and 30 days) and repose temperature (25 and 45 ◦C). The optimum copper extraction of 58.6% was achieved with the addition of 23.3 kg of NaNO3/ton, 19.8 kg of NaCl/ton, and after 30 days of curing at 45 ◦C. Under these pretreatment conditions, three samples of ore were leached in mini-columns. The studied parameters were temperature (25 and 45 ◦C) and chloride concentration (20 and 40 g/L). The optimum copper extraction of 63.9% was obtained in the mini-column leaching test at 25 ◦C, with the use of 20 g/L of chloride. A higher temperature (45 ◦C) and a higher chloride concentration (40 g/L) negatively affected the extraction. The pretreatment stage had favorable effects, in terms of accelerating copper dissolution and improving leaching of copper sulfide ore in acid-nitrate-chloride media. Waste salts from caliche industry and waste brine from reverse osmosis can be used for providing the nitrate and chloride media.

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Cite This Work

@article{07de18d2-f3e5-44a5-8a90-721b1bfde72f,
  title={Accelerating Copper Leaching from Sulfide Ores in Acid-Nitrate-Chloride Media Using Agglomeration and Curing as Pretreatment},
  author={Pía C. Hernández and Junior Dupont and Pí a C. Hern á ndez},
  year={2019},
  language={es}
}
TY  - JOUR
TI  - Accelerating Copper Leaching from Sulfide Ores in Acid-Nitrate-Chloride Media Using Agglomeration and Curing as Pretreatment
AU  - Pía C. Hernández
AU  - Junior Dupont
AU  - Pí a C. Hern á ndez
PY  - 2019
LA  - es
ER  -

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