Marisa Nascimento, Flávio Lemos
The study aimed to employ a comprehensive methodology for the acid processing of a rare earth element (REE) concentrate obtained from the ore from Araxá (MG-Brazil). The most important process variables have been identified and their levels determined to maximize REE extraction (%RE) and minimize Fe extraction (%Fe). The thermodynamic analysis showed that the roasting temperature (TF) is crucial for the control of Fe solubilization in the aqueous leaching step of the acid processing. A statistic design of laboratory experiments and a process optimization method were applied to address the interaction among the process variables. Experimental results showed that a TF of about 700 ◦C can significantly reduce the Fe concentration in the aqueous leaching liquor. Mathematical models were proposed to predict the effect of process variable on REE and Fe extraction of the concentrate. A multi-objective technique was employed for optimization of chemical processing and the best conditions were reached for roasting temperature (TF)= 700 ◦C, acid to sample mass ratio (ACs) = 0.8 and leaching time (tL) = 20 min, which led to %RE = 96.91% and %Fe = 21.69%.
@article{35563548-d71d-40d1-94b5-1bc5b0ac5df6,
title={Modeling of REE and Fe Extraction from a Concentrate from Araxá (Brazil)},
author={Marisa Nascimento and Flávio Lemos},
year={2019},
language={pt}
}TY - JOUR TI - Modeling of REE and Fe Extraction from a Concentrate from Araxá (Brazil) AU - Marisa Nascimento AU - Flávio Lemos PY - 2019 LA - pt ER -
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