Sulfidization performance of hemimorphite surface in sodium sulfide system and identification of sulfidization products
(1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Land Resource Engineering, 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. Inner Mongolia Xingye Mining Company Limited, Chifeng 024028, China)
2. Yunnan Key Laboratory of Green Separation and Enrichment of Strategic Mineral Resources, Kunming University of Science and Technology, Kunming 650093, China;
3. Inner Mongolia Xingye Mining Company Limited, Chifeng 024028, China)
Abstract: The sulfidization performance and mechanism of hemimorphite surface in a sodium sulfide (Na2S) system were revealed, and surface sulfidization products were identified through various analytical methods. The results showed that Na2S concentration had a significant effect on the sulfidization of the hemimorphite surface. An increase in Na2S concentration could promote the interaction between S species in the pulp and mineral surfaces, thereby increasing the content of sulfidization products and hydrophobicity of hemimorphite surface. XPS and ToF-SIMS analyses showed that the sulfidization product was not the sole monosulfide on hemimorphite surfaces and it was composed of monosulfide (S2-) and polysulfide (Sn2-). The content of polysulfide on mineral surface increased with an increase in the Na2S concentration, which improves the activity of sulfidization products on hemimorphite surface.
Key words: sulfidization performance; hemimorphite; Na2S concentration; zinc sulfide species; polysulfide