Recovery of rare earth elements from acidic mine waters: An unknown secondary resource
Visualitza/Obre
10.1016/j.scitotenv.2021.152258
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/368557
Tipus de documentArticle
Data publicació2022-03
EditorElsevier
Condicions d'accésAccés obert
Llevat que s'hi indiqui el contrari, els
continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
:
Reconeixement-NoComercial-SenseObraDerivada 4.0 Internacional
Abstract
Acidic mine Drainage (AMD) is still considered one of the greatest mining sustainability challenges due to the large volumes of wastes generated and the high associated treatment cost. New regulation initiatives on sustainable development, circular economy and the need for strategic elements as Rare Earth Elements (REE) may overcome the traditional research initiatives directed to developing low cost treatment options and to develop research initiatives to identify the potential benefit of considering such AMD as a potential secondary resource. As an example, this study develops the integration of a three-stage process where REE are selectively separated from base metals (e.g. Fe, Al, Mn, Ca, Mg, Cd, Pb) and then concentrate to produce a rich REE by-product recovered as REE-phosphates. Selective separation of Fe (>99%) was achieved by total oxidation to Fe(III) and subsequent precipitation as schwertmannite at pH 3,6 ± 0.2. REE were then extracted from AMD using a sulfonic ion-exchange resin to produce concentrated REE sulfuric solutions up to 0.25 gREE/L. In a final stage selective separation of REE from Al(III), Ca(II) and Mg(II) and transitions elements (Cu, Zn, Ni) was achieved by precipitation with phosphate solutions under optimized pH control and total phosphate concentration. XRD analysis identified low-crystalline minerals. By using a thermal treatment the presence of PrPO4(s) and Cheralite (CePO4(s)) where Ce is substituted by La and Ca and Xenotime (YPO4(s)) were found as main minerals AlPO4(s) Ca,MgYPO4(s) were also identified.
CitacióValderrama, C. [et al.]. Recovery of rare earth elements from acidic mine waters: An unknown secondary resource. "Science of the total environment", Març 2022, vol. 810, núm. article 152258.
ISSN0048-9697
Versió de l'editorhttps://www.sciencedirect.com/science/article/pii/S0048969721073344
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
1-s2.0-S0048969721073344-main.pdf | 1,145Mb | Visualitza/Obre |