Abstract
Selective dissolution of stibnite from a complex sulfidic antimony ore containing pyrite by ozonation leaching in hydrochloric acid solution has been studied in the paper. Effects of hydrochloric acid concentration, leaching time, temperature, gas (ozone and oxygen mixture) flow rate and liquid/solid ratio on antimony extraction and iron dissolution have been examined. The results show that the leaching efficiency (%) of antimony increases with the temperature (from 35°C to 65°C) and hydrochloric acid concentration (from 3.0mol/L to 4.5mol/L). In comparison, the iron dissolution remains constant in these ranges. In addition, it is noted that the decomposition of stibnite is easier than that of pyrite. High antimony extraction (94.3%) with low iron dissolution (2.3%) is achieved under the following leaching conditions: 4.5mol/L hydrochloric acid concentration, 2.0L/min gas flow rate and 8:1 of the L/S ratio, leaching for 4.0h at 65°C. These results reveal that ozonation leaching of the complex sulfidic antimony ore in hydrochloric acid solution is a promising technology.
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