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- Title
ON LEACHING OF RARE EARTH ELEMENTS FROM A DAVIDITE ORE OF THE III REGION OF CHILE.
- Authors
Hernández, José; Tapia, Jaime; Dides, Munir; Cubillos, Francisco
- Abstract
This paper presents a study of the technical feasibility of recovering rare earth elements (REE) from davidite ore obtained in the III region of Chile through a leaching process. The investigation is focused on the effect of the main parameters: the temperature (50°C - 70°C - 90°C), the initial sulphuric acid concentration (3.0 M- 3.5 M - 4.0 M) and the solid/liquid leaching ratio (1/1 kg/l - 1/5 kg/l - 1/10 kg/l). The main REE present in this ore refer to lanthanum, cerium, scandium and yttrium of a total concentration of 3,299 ppm. Iron and aluminium of initial concentrations of 28,720 ppm and 75,468 ppm, respectively, are the main impurities leached along with REE. The total amount of REE recovered varies between 11% and 38% in respect to the corresponding initial concentrations. The mechanism of the processes involved is determined by SEM analysis of the ore and a determination of the activation energy of the leaching process through a numerical modeling. It is found that the process follows a mixed control including diffusion through the pores followed by a chemical reaction. The initial acid concentration is the main variable involved in REE recovery because the porous layer formation is the main barrier to be overcome in the leaching process.
- Subjects
CHILE; RARE earth metals; LEACHING; ORES; CERIUM oxides; SULFURIC acid; CHEMICAL reactions; ACTIVATION energy
- Publication
Journal of Chemical Technology & Metallurgy, 2021, Vol 56, Issue 1, p247
- ISSN
1314-7471
- Publication type
Article