Effect of Sulfuric Acid Concentration on Chalcopyrite Concentrate Chemical Leaching

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This study reports the effect of sulfuric acid concentration on chalcopyrite chemical leaching in very simple H2SO4 solution systems ranging from 23g/L to 30g/L, with 2.5% chalcopyrite concentrate at 30°C. Copper extraction from chalcopyrite increases with an increase in sulfuric acid concentration, e.g. 86%, 90% and 92% after 96 days at 23g/L, 25/L and 27g/L H2SO4 solution respectively. Sulfur element formed on the surface of chalcopyrite was very porous as the result of an electron probe microanalyzer (EPMA). Copper extraction, however, leveled out at 35% after 20 days when the sulfuric acid concentration was higher than 28g/L on 25g/L of chalcopyrite concentrate. Sulfur element was detected by X-ray analysis as only a leaching reaction product. The passivation may be caused by thick elemental surface formed on the surface of chalcopyrite.

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Periodical:

Advanced Materials Research (Volumes 71-73)

Edited by:

Edgardo R. Donati, Marisa R. Viera, Eduardo L. Tavani, María A. Giaveno, Teresa L. Lavalle, Patricia A. Chiacchiarini

Pages:

353-356

Citation:

S. J. Joe et al., "Effect of Sulfuric Acid Concentration on Chalcopyrite Concentrate Chemical Leaching", Advanced Materials Research, Vols. 71-73, pp. 353-356, 2009

Online since:

May 2009

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$38.00

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40 80 120.

[50] 100 Cu Released [%].

[30] o C 28g/L 29g/L 30g/L (a).

40 80 120.

[2] [4] [6] Iron ion [g/L] open: total closed: ferrous (b).

40 80 120 400 450.

[1] [2] E vs Ag/AgCl[mV] (c) Time [days] pH open: ORP closed: pH Fig. 3. Changes in copper extraction (a), iron ion extraction (b), ORP (c) and pH values (d) on H2SO4 solution ranging from 28g/L to 30g/L.