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Peer-reviewedCC BYRSC advances

Adsorption and precipitation of ODA on KCl surfaces during flotation: evidence from FTIR and XPS

  • Huaide Cheng1,2
  • Changhao Luo1,2,3
  • Qingyu Hai1,2
  1. 1Key Laboratory of Green and High-end Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences No 18 Xinning Road Xining 810008 China [email protected].
  2. 2Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes Xining 810008 China.
  3. 3University of Chinese Academy of Sciences Beijing China.
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Abstract

This study investigates the concentration-dependent grain size evolution of octadecylamine hydrochloride (ODA·HCl), a commonly used cationic collector in potassium chloride flotation. FTIR and XPS spectroscopy were employed to analyze the adsorption states and interaction mechanisms of ODA on KCl surfaces under static equilibrium adsorption and dynamic flotation conditions. The results showed that: (1) the ODA·HCl flocculation revealed a pronounced concentration-driven evolution of grain size, and become smaller and more uniform when the concentration of ODA·HCl approaches that of actual flotation (1 × 10⁻² mol L⁻¹); (2) FTIR analysis confirmed the successful adsorption of ODA·HCl onto KCl surfaces, and the adsorption under dynamic flotation conditions exhibited a non-linear dependence on concentration; (3) XPS verified that ODA·HCl attaches to the KCl surface via a synergistic mechanism involving electrostatic attraction, partial deprotonation, and hydrogen bonding, without disrupting the KCl crystal structure. Taking into account grain size, adsorption behavior, flotation performance, and KCl dissolution loss in the mother liquor, the optimal collector concentration is proposed to lie within 1.0 × 10⁻² to 1.6 × 10⁻² mol L⁻¹. This range achieves a high recovery (>94%), a narrow grain size distribution, low reagent consumption, and minimal potassium salt dissolution loss, providing both a theoretical basis and practical guidance for optimizing the potash flotation process.

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Cite

BibTeXRIS
BibTeX
@article{cheng2026adsorption,
  title = {{Adsorption and precipitation of ODA on KCl surfaces during flotation: evidence from FTIR and XPS}},
  author = {Huaide Cheng and Changhao Luo and Qingyu Hai},
  journal = {RSC advances},
  year = {2026},
  month = nov,
  doi = {10.1039/d6ra08381a},
  url = {https://europepmc.org/article/PMC/PMC13725792},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Adsorption and precipitation of ODA on KCl surfaces during flotation: evidence from FTIR and XPS
AU  - Huaide Cheng
AU  - Changhao Luo
AU  - Qingyu Hai
PY  - 2026
DA  - 2026/11/02
JO  - RSC advances
DO  - 10.1039/d6ra08381a
UR  - https://europepmc.org/article/PMC/PMC13725792
AB  - This study investigates the concentration-dependent grain size evolution of octadecylamine hydrochloride (ODA·HCl), a commonly used cationic collector in potassium chloride flotation. FTIR and XPS spectroscopy were employed to analyze the adsorption states and interaction mechanisms of ODA on KCl surfaces under static equilibrium adsorption and dynamic flotation conditions. The results showed that: (1) the ODA·HCl flocculation revealed a pronounced concentration-driven evolution of grain size, and become smaller and more uniform when the concentration of ODA·HCl approaches that of actual flotation (1 × 10⁻² mol L⁻¹); (2) FTIR analysis confirmed the successful adsorption of ODA·HCl onto KCl surfaces, and the adsorption under dynamic flotation conditions exhibited a non-linear dependence on concentration; (3) XPS verified that ODA·HCl attaches to the KCl surface via a synergistic mechanism involving electrostatic attraction, partial deprotonation, and hydrogen bonding, without disrupting the KCl crystal structure. Taking into account grain size, adsorption behavior, flotation performance, and KCl dissolution loss in the mother liquor, the optimal collector concentration is proposed to lie within 1.0 × 10⁻² to 1.6 × 10⁻² mol L⁻¹. This range achieves a high recovery (>94%), a narrow grain size distribution, low reagent consumption, and minimal potassium salt dissolution loss, providing both a theoretical basis and practical guidance for optimizing the potash flotation process.
SN  - 2046-2069
ER  -