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The role of dissolved iron in the flotation of zinc/lead sulphide ores

Zieliński P. A.

Polish Journal of Chemical Technology

2003

Vol. 5, nr 3

22-25

The results of air exposure of a pulp containing dissolved iron have been studied using laboratory batch flotation experiments. Sulphide ore from three different stockpiles of a complex zinc/lead deposit was used. The pulp parameters such as pH, Eh, ion concentrations and dissolved oxygen concentrations were monitored along with metallurgical performance in zinc and lead differential flotation. Changes in iron concentration are correlated with most of the pulp parameters observed. A mechanism is proposed to explain this behaviour. This mechanism, combined with the metallurgical results, indicates that dissolved iron protects the surface of the minerals in the pulp against oxidation by scavenging oxygen dissolved in the slurry. The most visible influence of this phenomenon was observed on pyrite deportment; however, galena and sphalerite grades and recoveries were also affected.