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All Journal Bulletin of Chemical Reaction Engineering & Catalysis Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Handini, Tri
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Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Energy Engineering Materials Science & Nanotechnology

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Optimization and Kinetics of Terbium Leaching from Lapindo Mud using Sulfuric Acid as the Leaching Agent Supriadi, Harry; Suyanti, Suyanti; Astuti, Widi; Handini, Tri; Sujoto, Vincent Sutresno Hadi; Prameswara, Gyan
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 1 Year 2025 (April 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20252

Abstract

This study investigated the impact of solid/liquid ratio, solvent concentration, temperature, and leaching time on the recovery of rare earth elements (REEs), particularly terbium, from Lapindo mud using sulfuric acid as a leaching agent. The objective was to optimize the leaching conditions and identify the most appropriate kinetic model for describing the extraction process. Leaching experiments were conducted under various solid/liquid ratios, sulfuric acid concentrations, temperatures, and time. The findings revealed that the maximum terbium recovery of 94.51% was achieved at a solid/liquid ratio of 0.5, and 18 M sulfuric acid was used as the leaching agent for the extraction process at 200 °C for 30 minutes. Kinetic analysis proved that the Zhuravlev-Leshokin-Templeman (ZLT) model best described the leaching process. The calculated reaction's apparent activation energy (Ea) was 27.96 kJ/mol, indicating that a combination of chemical reactions and diffusion mechanisms controls the leaching process. These insights are crucial for optimizing the extraction of terbium and other REEs from Lapindo mud, offering significant potential for industrial applications in recovering valuable materials from waste sources. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Pemisahan Itrium dengan Cara Ekstraksi Menggunakan Solven TOPO Handini, Tri; Sukarna, I Made; Yuniyanti, Anisa Dwi
EKSPLORIUM Vol. 39 No. 2 (2018): NOVEMBER 2018
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2018.39.2.4419

Abstract

Separation process of yttrium by extraction using TOPO solvents has been done. The purpose of this study is to find out the optimum condition of the variation effect of extractant concentration, stirring time, and acidity of the rare earth feed and to determine the distribution coefficient, separation factor, and extraction efficiency (%), using the liquid-liquid extraction method. The feed used were rare earth elements of xenotime sand. The extractant used in the research were TOPO (tri-n-octylphosphine oxide). Concentration of yttrium (Y), disprosium (Dy), and gadolinium (Gd) were determined using X-ray fluorescene spectrometer. Optimum conditions of the extraction process obtained from this study were: TOPO extractant concentration in kerosene 20%, stirring time 15 minutes, acidity of feed 0.5 M. Obtained value of distribution coefficient Y = 5.61; Dy = 2.06; Gd = 0.99. For extraction efficiency Y = 85.13%, Dy = 67.80%, Gd = 50.17% whereas separation factor Y-Dy = 2.7186 and Y-Gd = 5.6861.
Co-Authors Gyan Prameswara Harry Supriadi I Made Sukarna Sujoto, Vincent Sutresno Hadi Suyanti Suyanti Widi Astuti Yuniyanti, Anisa Dwi