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Characterization of Lithium Presence in Brine and Extraction of Lithium from Brine Resources of Iran

Moazeni Afarani, Maryam | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44864 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Askari, Masoud; Nusheh, Mohammad
  7. Abstract:
  8. One of the basic resources for lithium extraction is brine which is very abundance in Iran. It is important to characterize these brines and their compositions to select a suitable method for lithium recovery from them. By investigation of the local brines and determining lithium and other alkali metals composition in them, the ion exchange process using titanium dioxide ion-sieve with nanotube morphology is suggested as highly effective method for lithium extraction from Iranian brines. Due to high advantages of hydrothermal process, TiO2 nanotubes were produced by this method and the optimum parameters of hydrothermal reactions were reported. In this way, hydrogen titanate nanotubes with 70 nm diameter and 2410 nm length were synthesized at 150°C for 48 hr. Li4Ti5O12 spinel phase was prepared by means of second hydrothermal of hydrogen titanate nanotubes in 0.2 M LiOH solution at 120°C for 24 hr and then heat treated at 350°C for 2 hr. Finally, TiO2 ion sieve was prepared by acid treatment of lithium titanate spinel with 0.5 M HCl solution.Microstructural characterization of synthesized nanostructure materials were carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infra-red (FT-IR) and ultra violet visible (UV-Vis) spectrums. Lithium adsorption capacity of this ion sieve from synthetic solutions was evaluated in different lithium concentrations. The results showed that the adsorption capacity increased by increasing lithium concentration and the final value reached to 39.43 mg/g
  9. Keywords:
  10. Ion Exchange ; Lithium Extraction ; Brine ; Titanium Dioxide Nanostructure ; Hydrothermal Method

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