中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 33 No. 4 April 2023 |
（1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China;
2. Yunnan Key Laboratory of Green Separation and Enrichment of Strategic Mineral Resources, Kunming University of Science and Technology, Kunming 650093, China;
3. Graduate School, North China University of Science and Technology, Tangshan 063210, China;
4. Shandong Gold Group Co., Ltd., Jinan 250100, China）
Abstract:Effect of oxygen and Na2S on the flotation of cuprite was invested by flotation test, FESEM, EMPA and XPS. The micro-flotation experiments indicated that the flotation recovery of cuprite can be greatly increased by adding an appropriate amount of Na2S. FESEM showed that numerous fragments were covered on the cuprite surfaces after sulfidization, and the shapes of these fragments were more regular and complete with the Na2S concentration of 5.0×10-4 mol/L. EPMA and EDS analysis confirmed that these fragments were newly-formed copper sulfide species, which was the key to promoting the flotation of cuprite. XPS analysis revealed that the sulfidization process of cuprite was that Na2S first underwent an oxidation-reduction reaction with the CuO on its surface, which was due to the extremely easy oxidation of the surface of cuprite. The Cu2+ was reduced to Cu+, and S2- was mainly oxidized to (S2)2- and (Sn)2-.
Key words: cuprite; sulfidization flotation; sulfidization mechanism; oxidization; copper sulfide species
