4.7 Article

Interaction mechanism of 2-hydroxy-3-naphthyl hydroxamic acid and 1-hydroxy-2-naphthyl hydroxamic acid in the flotation separation of bastnaesite/fluorite: Experiments and first-principles calculations

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ELSEVIER
DOI: 10.1016/j.seppur.2021.120307

关键词

Bastnaesite; Fluorite; Flotation; Collector; Naphthyl hydroxamic acid

资金

  1. National Natural Science Foundation of China [52104287, U2067201]
  2. Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources

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This manuscript investigates the performance and interaction mechanism of 2-hydroxy-3-naphthyl hydmxamic acid (2-OH-3-NHA) and 1-hydroxy-2-naphthyl hydmxamic acid (1-OH-2-NHA) as flotation collectors for the separation of bastnaesite/fluorite. The results show the excellent selectivities of NHAs and the better selectivity of 1-OH-2-NHA than 2-OH-3-NHA. Zeta potential measurements and first-principles calculations provide insights into the adsorption behavior and selectivity.
Bastnaesite ((Ce, La, Pr, Rb)CO3F) is an important source of light rare earth elements and is commonly associated with calcium (Ca)-containing minerals such as fluorite (CaF2), calcite (CaCO3) and dolomite ((Ca, Mg)(CO3)(2)). Froth flotation is an efficient method to separate bastnaesite and Ca-containing minerals. 2-hydroxy-3-naphthyl hydmxamic acid (2-OH-3-NHA) and 1-hydroxy-2-naphthyl hydmxamic acid (1-OH-2-NHA) are two widely used flotation collectors for bastnaesite and this manuscript investigates their performance and interaction mechanism in the flotation separation of bastnaesite/fluorite. The development of novel collectors must be based on the investigations of this manuscript. The flotation experimental results show the excellent selectivities of NHAs and the better selectivity of 1-OH-2-NHA than 2-OH-3-NHA. Zeta potential measurements suggest stronger adsorptions of NHAs on the bastnaesite surface than fluorite, which results in the excellent selectivities of NHAs. First-principles calculations demonstrate that naphthalene ring-bonded OH group of NHAs shows non-selective adsorption towards the surfaces of bastnaesite and fluorite. The better selectivity of 1-OH-2-NHA than 2-OH-3-NHA is explained by the lower reactivity of naphthalene ring-bonded OH group due to the stronger steric hindrance effect of naphthyl group towards this OH group.

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