TY - JOUR
T1 - Spectroscopic study on oxidative dissolution of chalcopyrite, enargite and tennantite at different pH values
AU - Sasaki, Keiko
AU - Takatsugi, Koichiro
AU - Ishikura, Kazuhiro
AU - Hirajima, Tsuyoshi
N1 - Funding Information:
Financial support was provided by the Japan Society for Promotion of Science (JSPS Grant-in-Aid for Scientific Research No. 20656147 ) and the Japan Oil, Gas and Metals National Corporation (JOGMEC) . Samples were supplied by courtesy of the Sumitomo Metal and Mining Co. Ltd.
PY - 2010/1
Y1 - 2010/1
N2 - Chalcopyrite (CuFeS2) occurs sometimes in association with As-bearing copper ores, such as enargite (Cu3AsS4) and tennantite (Cu12As4S13), especially in deep ore bodies. To employ oxidative pretreatment for recovering copper resources from these minerals, it is important to characterize the surface properties of enargite and tennantite as well as chalcopyrite. The minerals were oxidized in 0.013% H2O2 with O2 bubbling at pH 2, 5, and 11 followed by analysis with X-ray photoelectron spectroscopy. Elemental sulfur was formed most significantly at pH 2 in all sulfide mineral samples. Enargite was the most stable under the oxidative conditions. Arsenic in enargite was partly oxidized at pH 5. Substantial proportion of copper in tennantite was oxidized from Cu(I) to Cu(II) at pH 11. The dissolution rate of Cu from tennantite at pH 2 was by far the fastest, and incongruent dissolution of Cu occurred with suppression of As and S in tennantite. These selective differences in the oxidation may be of use in designing a flotation process for separation of these sulfide minerals.
AB - Chalcopyrite (CuFeS2) occurs sometimes in association with As-bearing copper ores, such as enargite (Cu3AsS4) and tennantite (Cu12As4S13), especially in deep ore bodies. To employ oxidative pretreatment for recovering copper resources from these minerals, it is important to characterize the surface properties of enargite and tennantite as well as chalcopyrite. The minerals were oxidized in 0.013% H2O2 with O2 bubbling at pH 2, 5, and 11 followed by analysis with X-ray photoelectron spectroscopy. Elemental sulfur was formed most significantly at pH 2 in all sulfide mineral samples. Enargite was the most stable under the oxidative conditions. Arsenic in enargite was partly oxidized at pH 5. Substantial proportion of copper in tennantite was oxidized from Cu(I) to Cu(II) at pH 11. The dissolution rate of Cu from tennantite at pH 2 was by far the fastest, and incongruent dissolution of Cu occurred with suppression of As and S in tennantite. These selective differences in the oxidation may be of use in designing a flotation process for separation of these sulfide minerals.
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U2 - 10.1016/j.hydromet.2009.11.007
DO - 10.1016/j.hydromet.2009.11.007
M3 - Article
AN - SCOPUS:71649095033
SN - 0304-386X
VL - 100
SP - 144
EP - 151
JO - Hydrometallurgy
JF - Hydrometallurgy
IS - 3-4
ER -