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| Oráč D., Hlucháňová B., Havlík T., Miškufová A., Petrániková M. |
| LEACHING OF ZINC AND COPPER FROM BLAST FURNACE DUST OF COPPER PRODUCTION OF SECONDARY RAW MATERIALS |
Abstract
The leaching of zinc and copper from blast furnace dust generated in pyrometallurgical treatment of secondary raw material originated in copper smelter KOVOHUTY, a.s., Krompachy, Slovakia is studied in this work. The influence of temperature, sulphuric acid concentration and weight of sample were investigated. For the experiments were used different temperatures (20, 40, 60 and 80 °C), concentrations of sulphuric acid (0.25, 0.5, 1 and 2M) and liquid to solid ratios (L:S = 10, 20 and 40). It follows from the results that leaching of zinc is fast and in the fifth minute was reached high extractions and under certain conditions practically the zinc was totally dissolved. Copper leaching had different behavior. The highest extractions were achieved after 60 minutes and the tendencies of curves indicate that prolongation of leaching time could result in higher extractions. The results also reveal that at certain conditions (0.25M H2SO4, 90 °C and L:S = 20) zinc can be dissolved selectively from copper but opposite situation where only copper is leached out without leaching of zinc can not be reached. Highest extractions for both metals together (97 % Zn and 68 % Cu) can be reached at conditions 2M H2SO4, 90 °C and L:S = 40.
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| Keywords: blast furnace dust|leaching|zinc|copper|secondary raw materials|hydrometallurgy| |
| No 3 (2009), p. 147-153 |
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