Experimental modeling of silicate-based geothermal deposits

Abstract

Scaling by metal silicates represents a major obstacle for geothermal systems. A composition that enables the fabrication of artificial deposits is necessary for the rapid testing of potential inhibitors. In this work, artificial deposits were synthesized by employing experimental conditions similar to those in the Tuzla Geothermal Field in Turkey. Although refluxing enabled the formation of a precipitate that was similar to naturally formed deposits in color and texture, their elemental composition and morphology showed a mismatch. An autoclave enabled the production of a precipitate that more closely resembled naturally formed deposits in color, texture, elemental composition, and structure.Test experiments were carried out at ionic strengths of 0.01 and 0.24 molal (m), pH values ranging from 3 to 11, and initial concentrations of silica of 250, 750, and 1250 ppm. The results showed that silica

Testing the Performance of Various Polymeric Antiscalants for Mitigation of Sb-Rich Precipitates Mimicking Stibnite-Based Geothermal Deposits

“…All these molecules were chosen because they contain functional groups that may interact with the deposit's precursor ions. PVA has hydroxyl groups that can act in functional groups interacting with the main cations [24,25]. PEG has oxygen with two lone pairs of electrons on its backbone [9].…”

Design of Polymeric Antiscalants Based on Functional Vinyl Monomers for (Fe, Mg) Silicates

“…The fabrication of (Fe, Mg) silicate was as reported in our previous work. 37 Briefly, chloride salts of Fe and Mg were treated with an aqueous solution of Na 2 SiO 3 . The concentration employed in our study as a model system simulated the ion concentrations from the Tuzla Geothermal Power Plant in the northwest part of Turkey.…”

“…The strategy in the determination of antiscaling performance is based on monitoring the concentration of silicic acid and metal cations in the leftover decantate solution after the isolation of solid precipitates from the autoclave reactor. The fabrication of (Fe, Mg) silicate was as reported in our previous work . Briefly, chloride salts of Fe and Mg were treated with an aqueous solution of Na 2 SiO 3 .…”

Characterization of Sb scaling and fluids in saline geothermal power plants: A case study for Germencik Region (Büyük Menderes Graben, Turkey)

“…Western Anatolia have been addressed by various researchers (Baba et al, 2015;Çelik et al, 2017;Demir et al, 2014;Yıldırım and Yıldırım, 2015).…”