skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Maximizing REE Recovery in Geothermal Systems

Abstract

Rare Earth element (REE) concentrations were measure in several on-land geothermal systems, many of which boil due to pressure drop during fluid upflow in geothermal production wells. REE were also measured in several seafloor hydrothermal systems sampled at pressures above the boiling point for comparison to boiled systems. Boiling during production lowers REE concentration in fluids sampled at the well head due to changes in fluid pH and Temperature that occur during boiling that affect the solubility of REE mineral phases. Geochemical calculations using the best available thermodynamic data were preformed to extend the understanding of REE behavior beyond the systems sampled for this study. Our data and modeling show that REE concentration in geothermal fluids is controlled by solubility limits, not by concentration in the source rocks. With the exception of La and Ce, the concentration of most of the REE in geothermal fluids are less than one part per trillion. There are no reasonable scenarios under which co-production of REE from geothermal fluids used to produce energy will contribute to the economic viability of the resource.

Authors:
; ; ;
Publication Date:
Research Org.:
University of California, Davis University of Oregon
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1501682
Report Number(s):
DE-EE0006748
DOE Contract Number:  
EE0006748
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English

Citation Formats

Zierenberg, Robert, Fowler, Andrew, Reed, Mark, and Palandri, Jim. Maximizing REE Recovery in Geothermal Systems. United States: N. p., 2018. Web. doi:10.2172/1501682.
Zierenberg, Robert, Fowler, Andrew, Reed, Mark, & Palandri, Jim. Maximizing REE Recovery in Geothermal Systems. United States. doi:10.2172/1501682.
Zierenberg, Robert, Fowler, Andrew, Reed, Mark, and Palandri, Jim. Fri . "Maximizing REE Recovery in Geothermal Systems". United States. doi:10.2172/1501682. https://www.osti.gov/servlets/purl/1501682.
@article{osti_1501682,
title = {Maximizing REE Recovery in Geothermal Systems},
author = {Zierenberg, Robert and Fowler, Andrew and Reed, Mark and Palandri, Jim},
abstractNote = {Rare Earth element (REE) concentrations were measure in several on-land geothermal systems, many of which boil due to pressure drop during fluid upflow in geothermal production wells. REE were also measured in several seafloor hydrothermal systems sampled at pressures above the boiling point for comparison to boiled systems. Boiling during production lowers REE concentration in fluids sampled at the well head due to changes in fluid pH and Temperature that occur during boiling that affect the solubility of REE mineral phases. Geochemical calculations using the best available thermodynamic data were preformed to extend the understanding of REE behavior beyond the systems sampled for this study. Our data and modeling show that REE concentration in geothermal fluids is controlled by solubility limits, not by concentration in the source rocks. With the exception of La and Ce, the concentration of most of the REE in geothermal fluids are less than one part per trillion. There are no reasonable scenarios under which co-production of REE from geothermal fluids used to produce energy will contribute to the economic viability of the resource.},
doi = {10.2172/1501682},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {3}
}