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Dissolution of Lithium Contained in Lepidolite Using Ascorbic Acid: Kinetic and Modeling Analysis.

Sayra Ordoñez1, Iván A Reyes2,3, Francisco Patiño4

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Summary

This study investigated the decomposition kinetics of a lithium-rich rock containing lepidolite using ascorbic acid. The research determined reaction orders and activation energies, revealing a mixed control regime transitioning to chemical control.

Keywords:
characterizationdecompositionkinetics modelinglepidolitelithium

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Area of Science:

  • Geochemistry
  • Materials Science
  • Chemical Kinetics

Background:

  • Rock samples rich in lithium, particularly those containing lepidolite, are valuable resources.
  • Understanding the decomposition kinetics of these minerals is crucial for efficient lithium extraction.
  • Ascorbic acid offers a potential medium for mineral processing due to its chemical properties.

Purpose of the Study:

  • To conduct a kinetic study and modeling of a lepidolite-rich rock sample's decomposition in ascorbic acid.
  • To determine the kinetic parameters, including reaction order and activation energy, for the decomposition process.
  • To elucidate the reaction mechanism and control regime governing the mineral decomposition.

Main Methods:

  • Rock sample characterization using X-ray diffraction (XRD), inductively coupled plasma atomic emission spectroscopy (ICP-AES), and X-ray photoelectron spectroscopy (XPS).
  • Kinetic analysis of lithium (Li) element decomposition curves in an ascorbic acid medium.
  • Modeling of decomposition data to obtain kinetic parameters and expressions.

Main Results:

  • The rock sample comprised 65.3% lepidolite, 30.6% quartz, and 4.1% muscovite, with a Li content of 3.38%.
  • Kinetic analysis yielded a reaction order (n) of 0.4307 and activation energy (Ea) of 48.58 kJ mol⁻¹ for the induction period, and n = 0.309 and Ea = 25.161 kJ mol⁻¹ for the progressive conversion period.
  • A mixed control regime was observed, transitioning from chemical to transport control at higher temperatures, with chemical control predominating.

Conclusions:

  • The kinetic study successfully modeled the decomposition of the lepidolite-rich rock in ascorbic acid.
  • The determined kinetic parameters provide insights into the reaction mechanism and control factors.
  • The findings are significant for optimizing lithium extraction processes from lepidolite-containing ores.