Characterization of the solid residue of enargite Cu3AsS4 after alaline leaching
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Institute of Geotechnics of the Slovak Academy of Sciences
J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences
University of Concepción
Publication date: 1999-01-01
Physicochem. Probl. Miner. Process. 1999;33(1):7-14
The characterization of solid after alkaline leaching of enargite Cu3AsS4 is discussed. X-ray diffractometry for characterization of the physico-chemical transformations in bulk of source enargite concentrate resulted from alkaline leaching was used. The surface layers of the samples of enargite concentrate were investigated with XPS spectroscopy. The leaching of mechanically activated enargite concentrate with Na2S leads to total extraction of arsenic (the content of As in a solid after leaching is 0.06%) and then decomposition of enargite (Cu3AsS4) with formation of new phases of copper sulphide and jarosite. XPS spectroscopy measurements did not registered the occurrence of arsenic in any chemical form in the sample of solid taken from leaching system.
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