4.5 Article

Behavior and Mechanism of a Novel Hydrophobic Collector in the Flotation of Bastnaesite

期刊

MINERALS
卷 12, 期 7, 页码 -

出版社

MDPI
DOI: 10.3390/min12070817

关键词

flotation; hydrophobic; phenylpropyl hydroxamic acid (PHA); bastnaesite

资金

  1. Jiangxi Provincial Education Department [51774152]
  2. [GJJ200816]

向作者/读者索取更多资源

This paper investigates the application of a new collector, phenylpropyl hydroxamic acid (PHA), for the separation of bastnaesite from calcite. The experimental results demonstrate that PHA exhibits good selectivity and collection performance. Various analyses reveal the chemical adsorption and reactions between PHA and bastnaesite, leading to changes in the surface properties of bastnaesite and improved hydrophobicity for easier flotation.
In order to improve the recovery of rare earth elements, finding a collector with a strong selectivity ability had become the focus of research. In this paper, phenylpropyl hydroxamic acid (PHA) was used as a new hydrophobic surfactant collector for the separation of bastnaesite from calcite, and salicylic hydroxamic acid (SHA) was used as a reference collector. The results of a single mineral flotation test with SHA show that the reagent has good collection performance and selectivity. In addition, Zeta potential measurements and FTIR analysis show that PHA is adsorbed on the surface of bastnaesite by chemical adsorption, and the surface state of bastnaesite changes after PHA treatment. By XPS analysis, PHA interacts with Ce, and forms a Ce-O bond with Ce. It is speculated that the hydroxamic acid forms a five-element-chelated hydroxamic group with Ce on bastnaesite surface, so as to improve the hydrophobicity of bastnaesite, and make bastnaesite float more easily out of the pulp. According to DFT calculation, PHA has better adsorption capacity and stronger hydrophobicity than SHA, and shows superior electronic group capacity and chemical reactions that promote its flotation performance.

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