An experimental study of synthetic Hydroxybastnäsite-(La) solubility and speciation in carbonate bearing aqueous solutions at 175–250 °C
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- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Arizona State University, Tempe, AZ (United States)
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- New Mexico Institute of Mining and Technology, Socorro, NM (United States)
- New Mexico Institute of Mining and Technology, Socorro, NM (United States); Indiana University, Bloomington, IN (United States)
- Arizona State University, Tempe, AZ (United States)
The transport and enrichment of rare earth element (REE) ore bodies are dependent on the stability of aqueous metal ligand complexes and the solubility of REE bearing minerals. REE ores are commonly associated with igneous systems having aqueous fluids with high carbonate concentrations and REE solubilities have been shown to be dependent on temperature and associate anion aqueous ligands present in solution. Furthermore, this work presents solubility experiments of hydroxybastnäsite-(La) at elevated temperatures in aqueous solutions of varying carbonate concentrations. At lower temperatures, hydroxybastnäsite-(La) solubility is controlled by neutral mono-carbonate LaCO3OH° but at higher temperatures and activities of carbonate species, charged di-carbonate La(CO3)2- increases and predominates. This divergence, and the difference in solubility products of other hydroxybastnäsite-(REE) phases, provides a potential mechanism for REE fractionation in carbonate dominated aqueous solutions. To illustrate one such mechanism the solubility data of hydroxybastnäsite-(La) is compared with previously reported data of hydroxybastnäsite-(Nd) at elevated temperatures.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); New Mexico Institute of Mining and Technology, Socorro, NM (United States)
- Sponsoring Organization:
- USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
- Grant/Contract Number:
- 89233218CNA000001; SC0022269
- OSTI ID:
- 3015169
- Report Number(s):
- LA-UR--25-20862; 10.1016/j.gca.2025.11.043
- Journal Information:
- Geochimica et Cosmochimica Acta, Journal Name: Geochimica et Cosmochimica Acta Vol. 413; ISSN 0016-7037
- Publisher:
- Elsevier; The Geochemical Society; The Meteoritical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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