TY - JOUR
T1 - Kinetic study of copper leaching from chalcopyrite concentrate in alkaline glycine solution
AU - Shin, Doyun
AU - Ahn, Junmo
AU - Lee, Jaeheon
N1 - Funding Information:
D. Shin was supported for her sabbatical at the University of Arizona by the Basic Research Project ( GP2017-025 ) of the Korea Institute of Geoscience and Mineral Resources (KIGAM), funded by the Ministry of Science and ICT of Korea.
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2019/1
Y1 - 2019/1
N2 - Recently, glycine, one of the simplest amino acids, has been emerging as an efficient and environmental-friendly lixiviant for copper leaching. In the present study, an alkaline glycine–peroxide lixiviant system was used to leach copper from chalcopyrite concentrate by a suite of kinetic studies under different conditions. The particle size of the concentrate was P80 40 μm. Glycine concentration was varied from 0.5 to 3.0 M (glycine to copper molar ratio of 1.1 to 6.6:1) and the pH was maintained at 11 during the experiment. The copper extraction within 96 h was observed from 13 to 14% with glycine concentrations from 0.5 to 2 M, while the copper extraction decreased at 3 M of glycine. By reconstituting the glycine concentration during the leach test and adding hydrogen peroxide periodically, the copper extraction with 1 M glycine at 96 h increased from 14 to 21%, respectively. By changing the glycine and hydrogen peroxide solution every 24 h, 42% of copper extraction was achieved within 168 h. With increasing temperature, copper extraction decreased, while iron dissolution increased. Copper sulfide and copper sulfate precipitates were found in the leaching liquor at 22 °C test. Poorly crystalline copper-iron sulfate phase was observed in the leaching liquor at 35 and 45 °C. This precipitation is believed to be one of the factors to decrease the copper recovery from chalcopyrite.
AB - Recently, glycine, one of the simplest amino acids, has been emerging as an efficient and environmental-friendly lixiviant for copper leaching. In the present study, an alkaline glycine–peroxide lixiviant system was used to leach copper from chalcopyrite concentrate by a suite of kinetic studies under different conditions. The particle size of the concentrate was P80 40 μm. Glycine concentration was varied from 0.5 to 3.0 M (glycine to copper molar ratio of 1.1 to 6.6:1) and the pH was maintained at 11 during the experiment. The copper extraction within 96 h was observed from 13 to 14% with glycine concentrations from 0.5 to 2 M, while the copper extraction decreased at 3 M of glycine. By reconstituting the glycine concentration during the leach test and adding hydrogen peroxide periodically, the copper extraction with 1 M glycine at 96 h increased from 14 to 21%, respectively. By changing the glycine and hydrogen peroxide solution every 24 h, 42% of copper extraction was achieved within 168 h. With increasing temperature, copper extraction decreased, while iron dissolution increased. Copper sulfide and copper sulfate precipitates were found in the leaching liquor at 22 °C test. Poorly crystalline copper-iron sulfate phase was observed in the leaching liquor at 35 and 45 °C. This precipitation is believed to be one of the factors to decrease the copper recovery from chalcopyrite.
KW - Alternative lixiviant
KW - Chalcopyrite
KW - Glycine
KW - Passivation
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U2 - 10.1016/j.hydromet.2018.10.021
DO - 10.1016/j.hydromet.2018.10.021
M3 - Article
AN - SCOPUS:85057272184
VL - 183
SP - 71
EP - 78
JO - Hydrometallurgy
JF - Hydrometallurgy
SN - 0304-386X
ER -