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Selective Silica Removal in Geothermal Fluids : Implications for Applications for Geothermal Power Plant Operation and Mineral Extraction

Spitzmüller, Laura 1; Goldberg, Valentin 1; Held, Sebastian 1; Grimmer, Jens C. 1; Winter, Daniel; Genovese, Milena; Koschikowski, Joachim; Kohl, Thomas 1
1 Institut für Angewandte Geowissenschaften (AGW), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):
Raw material extraction from geothermal fluids often comprises concentrating and cooling steps, which increases the risk of silica scaling formation. However, existing silica removal strategies do not consider the impact on raw material extraction. In this study, the applicability and element-selectivity of three silica removal techniques (seed-induced, lime and caustic precipitation) were tested in batch experiments using synthetic and natural geothermal fluid samples. Increasing the pH-value to 10.5 and the Ca/Si ratio > 1.25 was found to mitigate silica scaling effectively via formation of calcium-silicate-hydrate phases (C-S-H phases). The developed silica removal process does not affect the raw materials and is therefore suitable for brine mining purposes.

Preprint §
DOI: 10.5445/IR/1000133345/pre
Veröffentlicht am 07.06.2021
Postprint §
DOI: 10.5445/IR/1000133345
Frei zugänglich ab 27.05.2022
DOI: 10.1016/j.geothermics.2021.102141
Zitationen: 3
Web of Science
Zitationen: 3
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2021
Sprache Englisch
Identifikator ISSN: 0375-6505
KITopen-ID: 1000133345
Erschienen in Geothermics
Verlag Elsevier
Band 95
Seiten Art.-Nr. 102141
Vorab online veröffentlicht am 26.05.2021
Schlagwörter Silica scaling mitigation, Lithium, C-S-H phases, Mineral extraction, Selective silica removal
Nachgewiesen in Dimensions
Web of Science
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