Abstract
The flotation of bastnaesite, as a major mineral source of rare earth elements, attracting much attention in the mineral processing field, is challenging owing to the natural flotability of calcium-bearing minerals. To promote the application of flotation, we systematically investigated the flotation behavior of bastnaesite, barite, and calcite, with salicylhydroxamic acid (SHA) as the collector through micro-flotation experiments, zeta-potential measurements, Fourier transform infrared (FT-IR) analyses, X-ray photoelectron spectroscopy (XPS) analyses, and solution chemistry analyses. Micro-flotation experiments confirm that the flotability of bastnaesite is high at pH 6.5–8.5, while calcite floats at pH 8.0–9.5, and barite has little flotation response. The results of FT-IR, XPS, and zeta-potential measurements indicate that there is chemical adsorption of SHA on the bastnaesite surface, and physical adsorption also occurs. However, as for barite and calcite, there is only physical adsorption of SHA on the surfaces. The solution chemistry results show that SHA anions can interact with RE3+, REOH2+, and RE(OH)2+ on bastnaesite surfaces in aqueous suspensions, resulting in bastnaesite flotation.
Highlights
Rare earth elements (REEs) are a group of 15 elements of the lanthanide series together withSc and Y
The results show that the flotability of bastnaesite is better than that of barite or calcite at pH 5.5−9.5
According to the experimental results and analyses, salicylhydroxamic acid (SHA) can be chemisorbed on the bastnaesite surface resulting in enhanced flotability; the interaction between SHA and barite and calcite is mainly by physical adsorption
Summary
Rare earth elements (REEs) are a group of 15 elements of the lanthanide series together with. 1-hydroxyl-2-naphthyl hydroxamic acid (H203) collector claimed chemical adsorption between rare earth ions, generating five-element chelate rings, and physical adsorption [6,19]. A study oxygen atoms of H203 and rare earth ions, generating five-element chelate rings, and physical of salicylhydroxamic acid collectors suggested the rare earth cation hydrolysis of major surface adsorption [6,19]. The results of this paper are of salicylhydroxamic acid (SHA) as the collector has been researched, it is important to further practical significance for understanding and grasping the flotation nature of valuable minerals and research the flotation behaviors of the main gangue minerals, such as barite and calcite. Of this paper are of practical significance for understanding and grasping the flotation nature of valuable minerals and gangue minerals in bastnaesite ores and guiding the development and utilization of rare earth deposits
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