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All Journal Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Riesna Prassanti
PTBGN-BATAN
Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Materials Science & Nanotechnology Social Sciences

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Pemisahan Unsur-unsur pada Monasit Bangka dengan Pengendapan Bertingkat Novriyanisti, Anggi; Prassanti, Riesna; Widana, Kurnia Setiawan
EKSPLORIUM Vol. 42 No. 1 (2021): MEI 2021
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2021.42.1.6093

Abstract

Monazite is a mineral side product of tin processing, which mainly contains uranium (U), thorium (Th), rare earth elements (REE), and phosphate compounds (PO4). Besides these main elements, monazite also contains other metals such as aluminum (Al), iron (Fe), bismuth (Bi), gallium (Ga), and thallium (Tl). The elements in monazite must be separated to be used. This study aims to determine the effect of pH variations in the separation of components in monazite with multilevel precipitation and determine elements produced from each pH variation. The variation pH starts from pH 0,5 to 10 with a different pH of zero points five. The elements in monazite are separated gradually, beginning from the decomposition process using sodium hydroxide (NaOH), dissolving with hydrochloric acid (HCl), and graded deposition with ammonium hydroxide (NH4OH). The elements were analyzed using the instrument Inductively Coupled Plasma Optical Spectroscopy (ICP-OES) and UV-Visible Spectrophotometer. The effect of pH variations produced precipitated pH 3, pH 6, pH 6.5, and pH 7. The elements produced at each pH variation are uranium, thorium, rare earth elements, aluminum, iron, bismuth, gallium, and thallium. Uranium and thorium were mostly at pH 3 with the recovery of U 72.3% and Th 46.33% and rare earth elements at pH 6.5 with 41.87% recovery. The elements Fe and Bi mostly settle at pH 3 with levels of 37.9 ppm and 100.9 ppm. The elements Al, Ga, and Tl, precipitate most at pH 6.5 with grades of 30.2 ppm, 69.8 ppm, and 8 ppm respectively.
Separation of Thorium (Th) from Monazite Sand of Bangka Island using Primene JMT Solvent Extraction Method Claudia, Dita; Fabiani, Verry Andre; Nurhadini, Nurhadini; Prassanti, Riesna
EKSPLORIUM Vol. 44 No. 2 (2023): NOVEMBER 2023
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2023.6480

Abstract

Thorium is an essential element as an alternative nuclear fuel to replace uranium. Thorium is found in the mineral monazite, which is a by-product of the alluvial tin mining process. Many methods have been used to extract and separate thorium from uranium and REEs from monazite, one of which is the organic solvent extraction method. In this research, the primene JMT, which is an extractant of primary amine compounds, was used in the method. The studied parameters are feed pH, JMT primene concentration, and stirring speed. The results show that the optimum conditions for Th extraction in monazite using solvent extraction method primene JMT were obtained at pH 0.5, extractant concentration of 2%, and stirring speed of 300 rpm with Th recovery of 94.05% while U and REE were not extracted.
Analytical Method Validation of Thorium in Ore Sample Using UV-Vis Spectrophotometer Indryati, Suci; Hidayat, Amalia Ekaputri; Pratama, Afiq Azfar; Laksamana, Roza Indra; Widana, Kurnia Setiawan; Ramlan, Muhammad Alif; Purwanti, Tri; Prassanti, Riesna; Anggraini, Mutia; Rommy, Rommy
EKSPLORIUM Vol. 44 No. 2 (2023): NOVEMBER 2023
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2023.6965

Abstract

Monazite contains several rare earth elements (REE) along with radioactive elements, i.e., thorium (Th) and uranium (U). Thorium content in monazite is several times higher than uranium. Monazite contains around 12% thorium oxide, but the thorium content in this mineral varies depending on location. To determine the thorium content in monazite, an appropriate and validated analytical method is needed so that the reliability of the test results can be trusted. Apart from that, method validation is one of the clauses in SNI ISO/IEC 17025:2017 that must be fulfilled by the laboratory to be certified and produce reliable data. This research aims to validate analytical methods for non-standard and modified methods that are likely to be used outside the scope. In this research, the method used to digest and analyze thorium in mineral samples refers to the ASTM E2941-14 method with several modifications. Therefore, the analysis method needs to be validated. Validation of the analytical method is carried out by testing several parameters such as linearity and working range tests, accuracy, precision (repeatability), Limit of Detection (LOD), and Limit of Quantitation (LOQ). The results of linearity, accuracy, and repeatability tests that meet the acceptance requirements can be used as a method of validation evaluation. The results of the method validation parameter test met the acceptance requirements, with the linearity test showing a coefficient of determination (R2) of 0.997, the accuracy test showing % a recovery value of 106.22%, and the precision (repeatability) test showing %RSD of 3.76% with LOD value is 0.650 mg/L, and LOQ is 0.724 mg/L. Based on the results of these parameter tests, the method for analyzing thorium in mineral samples was validated.
Co-Authors Briliant Briliant Budi Yuli Ani, Budi Yuli Claudia, Dita Erlan Dewita Fauzan, Ahmad Miftah Hafni Lissa Nuri Hidayat, Amalia Ekaputri Hidayat, Rachmat Fauzi Indryati, Suci Kurnia Setiawan Widana Kurnia Trinopiawan Laksamana, Roza Indra Laksmana, Roza Indra Maria Veronica Purwani Mohammad Zaki Mubarok, Mohammad Zaki Mutia Anggraini Novriyanisti, Anggi Nurhadini Nurhadini Permana, Yoga Pratama, Afiq Azfar Purwanti, Tri Putra, Aditya Widian Ramlan, Muhammad Alif Rommy, Rommy Rudi Pudjianto, Rudi Sumarni Sumarni Sumiarti Sumiarti Sumiarti Umar Sarip, Umar Verry Andre Fabiani