University of Kashan Journal of Nanostructures 2251-7871 15 4 2025 10 01 The Possibility of Flotation and Gravity Separation Methods for a Mixed Pb and Zn Oxide-Sulfide Ore 2060 2070 114579 10.22052/JNS.2025.04.046 EN Faraz Soltani Mining Engineering Department, Arak University of Technology, Markazi, Iran Hossna Darabi Iranian Research Organization for Science and Technology, Tehran, Iran Reza Rastegarfar Miduk Copper Complex, National Iranian Copper Industry Company, Kerman, Iran Mehdi Shaabani Miduk Copper Complex, National Iranian Copper Industry Company, Kerman, Iran Journal Article 2025 05 20 With the depletion of lead and Zn sulphide reserves, processing of oxide and oxide-sulphide mixture deposits has gained significant importance. In the present research, lead and zinc minerals were concentrated from an oxide-sulphide ore containing 2.92% Zn (2.42% oxide) and 1.61% lead (1.23% oxide) with silicate gangue. Flotation experiments were conducted with two approaches: differential flotation of sulphide and oxide minerals in several stages, and cumulative flotation of mixed sulphide-oxide minerals. The effects of desliming and flotation reagents were examined. Results indicated that differential flotation of sulphide and oxide minerals is impractical for this ore. Optimal conditions for ore concentration were identified as flotation of mixed sulphide-oxide minerals of lead with d80 of 90 μm and the addition of 6000 g/t sodium sulphide in the rougher stage and 1000 g/t in the scavenger stage. Bromoform heavy liquid tests revealed that Zn recovery in the heavy fraction remained relatively unchanged with particle size reduction, whereas Pb recovery increased from 74.22% to 89.09%. Finally, a combination of mixed sulphide-oxide flotation along with gravity separation using a shaking table and spirals was proposed. https://jns.kashanu.ac.ir/article_114579_491e95641e9a25c8cc51e8b296409cdf.pdf