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Development of a fluid treatment strategy to enable combined raw material and freshwater recovery from geothermal fluids

Goldberg, Valentin; Winter, Daniel; Nitschke, Fabian; Morata, Diego; Koschikowski, Joachim; Kohl, Thomas


The energy transition and the associated need for non-energy, mineral raw materials have prompted the German government to expand research and development activities along the entire value chain. It is well known that the highly mineralized thermal waters that circulate during the extraction of geothermal energy have, in some cases, significant enrichments of economically strategic elements such as lithium, rubidium, antimony or magnesium. The extraction of mineral resources from thermal waters is still challenging in terms of process technology, but new sustainable methods are paving the way for economic extraction as an alternative to conventional hard rock mining. Due to the overall high salt concentrations, selective separation of scale-forming minerals in a pretreatment stage is necessary to avoid scalings or membrane fouling in the later process steps.

The focus of this study is on controlling silicate precipitation, which is expected to occur due to temperature changes and proceeding concentration cycles, which are required for raw material and freshwater extraction. The treatment and an associated precipitation process must be cost-effective, integrable into the power plant process, and selective for silica but must not affect the concentration of valuable elements. ... mehr

Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Vortrag
Publikationsdatum 20.09.2021
Sprache Englisch
Identifikator KITopen-ID: 1000137661
HGF-Programm 38.04.04 (POF IV, LK 01) Geoenergy
Veranstaltung GeoKarlsruhe (DGGV 2021), Karlsruhe, Deutschland, 19.09.2021 – 24.09.2021
Schlagwörter Geothermal Energy,, Lithium,, Raw Material extraction
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