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All Journal CHEMICA Jurnal Teknik Kimia
Nasution, Yogi Tri Putra
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Chemical Engineering, Chemistry & Bioengineering Energy

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Preliminary study of production electrolytic silicon from silica amorphous in alkaline media Rahman, Muhammad Miftahur; Siagian, Franky Michael Hamonangan; Nasution, Yogi Tri Putra; Astuti, Widi; Sutopo, Ulung; Petrus, Himawan Tri Bayu Murti
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 2 (2023): August 2023 [Available online since October 02, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i2.26735

Abstract

This study used direct electrowinning to examine the viability of producing silicon from amorphous silica in alkaline conditions. The Indonesian Dieng Geothermal Power Plant provided a sample of geothermal sludge with a high silica (SiO2) content. The samples were analyzed using various analytical techniques (XRF and XRD) before to electrolysis to ascertain their chemical composition and mineralogy. At low temperatures (30°C), the direct electrowinning method using amorphous silica suspended in sodium hydroxide (NaOH) was introduced. Current density adjustments were made to determine the direct electrowinning method's ideal operation. XRD and XRF analyses were performed on cathode deposits and residues in electrochemical cells to ascertain the chemical composition and current recovery. At a current density of 1250 A/m2, the low-temperature electrolysis current efficiency on natrium silicate solution can approach 34% recovery. Geothermal sludge was used to investigate the process, and the process's mediocre performance was caused by the problematic adsorption of amorphous silica particles on the cathode.
Co-Authors Himawan Tri Bayu Murti Petrus Rahman, Muhammad Miftahur Siagian, Franky Michael Hamonangan Sutopo, Ulung Widi Astuti