期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 25, 期 10, 页码 3461-3466出版社
ELSEVIER
DOI: 10.1016/S1003-6326(15)63983-8
关键词
gold bearing pyrite; H2SO4-Fe-2(SO4)(3) system; leaching kinetics; activation energy; sulfur oxidation
资金
- National Natural Science Foundation of China [51474075]
Gold bearing pyrite leaching was conducted in H2SO4-Fe2(SO4)3 system at different reaction temperatures, with different ferric ion concentrations, sulfuric acid concentrations and stirring speeds. The leaching kinetics and mechanism were studied. When the temperature ranged between 30-75 degrees C, the pyrite leaching was mainly controlled by chemical reaction with positive correlation to the ferric ion concentration. The activation energy obtained from Arrhenius empirical formula is 51.39 kJ/mol. The EDS and XPS analyses suggest that the oxidation of sulfur within pyrite is through a series of intermediate stages, and eventually is oxidized to sulphate accompanied with the formation of element sulfur. This indicates a thiosulfate oxidation pathway of the gold bearing pyrite oxidation in H2SO4-Fe-2(SO4)(3) system.
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