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All Journal Ganendra: Majalah IPTEK Nuklir Bulletin of Chemical Reaction Engineering & Catalysis Jurnal Rekayasa Proses
Harry Supriadi
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Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Other

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IDENTIFIKASI TENORM DALAM NATRIUM ZIRKONAT (NA2ZrO3) HASIL PROSES PELINDIAN AIR Sukirno Sukirno; Harry Supriadi
GANENDRA Majalah IPTEK Nuklir Volume 15 Nomor 1 Januari 2012
Publisher : Website

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (194.738 KB) | DOI: 10.17146/gnd.2012.15.1.23

Abstract

IDENTIFIKASI TENORM DALAM NATRIUM ZIRKONAT (Na2ZrO3) HASIL PROSES PELINDIAN AIR. Makalahini melaporkan hasil-hasil pengukuran metoda spektrometri gamma dari konsentrasi radionuklida Th-228, Ra-226 dan K-40 serta dengan metoda AAN untuk pengukuran konsentrasi U-238 dan Th-232 dalam contohnatrium zirkonat (Na2ZrO3). Natrium zirkonat merupakan bahan hasil proses pelindian air, mengandung uraniumdan torium, sehingga memiliki potensi kontaminasi dan menaikkan paparan radiasi yang cukup besar. Tiaptahapan proses akan menghasilkan produk yang di dalamnya kemungkinan terdapat TENORM. Instrumen yangdigunakan adalah alat cacah g maestro II EG&G spektrometer γ Ortec dengan detektor Ge(Li). Teknik untukmenentukan konsentrasi radionuklida Th-228 ditentukan melalui anak luruhnya yaitu Pb-212 yang mempunyaienergi 238,6 keV, dan radionuklida Pb-210, Ra-226, K-40 langsung ditentukan dari energi masing-masing 46,5;186,2; 1460,75 keV. U-238 diidentifikasi melalui energi puncak 228,2 keV dari Np-239 dan Th melalui energipuncak 311,8 dari Pa-233. Konsentrasi radionuklida yang tertinggi dalam natrium zirkonat pada berbagai ukuranbutir adalah Ra-226 = 3664,4±95,9 Bq/kg dan radionuklida yang terendah adalah K-40 = 82,37±13,0 Bq/kg. Darimetoda analisis varians model desain acak sempurna untuk pengujian statistik, ditunjukkan bahwa terdapat tidakbeda secara nyata pengaruh ukuran butir umpan (hasil leburan pasir Zr) terhadap konsentrasi radionuklida Pb-210,Ra-226, Th-228 dan K-40, pada pengujian dengan taraf kepercayaan 95 %.Kata kunci : TENORM, pelindian, natrium zirkonat, uji statistik varian.
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).
Dekomposisi termal mangan oksalat (MnC2O4) dari ekstraksi mangan dari bijih mangan Lampung menghasilkan mangan oksida Nainggolan, Nurul Istiqomah; Marjunus, Roniyus; Dewi, Jilda Sofiana; Supriyatna, Yayat Iman; Supriadi, Harry; Astuti, Widi
Jurnal Rekayasa Proses Vol 18 No 1 (2024): Volume 18, Number 1, 2024
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.86556

Abstract

Research on the thermal decomposition of manganese oxalate (MnC2O4) from manganese extraction product of Lampung manganeses ore on manganese oxide recovery has been carried out. This study consisted of three main stages, namely reductive leaching, precipitation of manganese using oxalic acid to produce manganese oxalate, and thermal decomposition to produce manganese oxide. In the thermal decomposition process, MnC2O4 as much 1 g and 3 g using decomposition time of 30 minutes, 1, 2, and 3 hours; and the temperatures of 350, 450, 550, and 650oC. Purity of manganese oxide from thermal decomposition is 96%. XRD analysis show a that at a mass of 1 g using a temperature of 350 dan 450 oC with variations time, manganese oxides phase is obtained hausmannite (Mn3O4) and bixbyite (Mn2O3). But at temperatures of 550 and 650 oC the hausmannite phase compound is completely transformed into bixbyite phase with highest peak intensity at an angle of 2θ = 33o. While using a mass of 3 g with all variations of time and temperature showed the acquisition of two types of manganese oxide phase, namely hausmannite and bixbyite.
Co-Authors Aminuyati Dewi, Jilda Sofiana Fajarwati, Febi Indah Gyan Prameswara Handini, Tri Marjunus, Roniyus Mulwandari, Meike Nainggolan, Nurul Istiqomah Sujoto, Vincent Sutresno Hadi Supriyatna, Yayat Iman Suyanti Suyanti Widi Astuti