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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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Judul Prassanti, Riesna; Sarip, Umar
Eksplorium Buletin Pusat Teknologi Bahan Galian Nuklir Vol 31, No 153 (2010): Mei 2010
Publisher : Pusat Teknologi Bahan Galian Nuklir - BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (30.019 KB)

Abstract

Sari
Analytical Method Validation of Thorium in Ore Sample Using UV-Vis Spectrophotometer Indryati, Suci; Hidayat, Amalia Ekaputri; Pratama, Afiq Azfar; Laksmana, 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 : Badan Riset dan Inovasi Nasional

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.
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 : Badan Riset dan Inovasi Nasional

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.
Pemisahan Uranium dari Thorium pada Monasit dengan Metode Ekstraksi Pelarut Alamine Trinopiawan, Kurnia; Prassanti, Riesna; Sumarni, Sumarni; Pudjianto, Rudi
EKSPLORIUM Vol. 32 No. 1 (2011): MEI 2011
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2011.32.1.2829

Abstract

The research of monazite processing have obtained the process to recover 62% of rare earth elements (REE) from following steps, such as decomposition, partial dissolution, precipitation at pH 6,3, and precipitation at pH 9,8. There was an increased efficiency of the process in 2009, when ion exchange is used in process development, and the REE recovery became 85%. Besides REE, monazite processing also produce uranium and thorium, but they not separated individually yet. The research of the U from Th separation from pH 6,3 precipitate dissolution by H2SO4, is carried out using solvent extraction method, which the extractant consist of Alamine-336, kerosene, and isodecanol. This research is purposed to obtain the optimum condition of separation uranium from thorium with solvent extraction, where U separated from Th as best as it could . The research’s parameters are feed pH, O/A ratio, and extraction time. And the result showed that the optimum condition were 1,5 of pH, 5 of O/A ratio, and 5 minutes of extraction time, and the percentage of U extracted was 100%, but 32,44% of Th also extracted. From the result, it has a conclusion that 67,56% of Th could be separated from U.
Penentuan Kondisi Pelarutan Residu dari Hasil Pelarutan Parsial Monasit Bangka Sumarni, Sumarni; Prassanti, Riesna; Trinopiawan, Kurnia; Sumiarti, Sumiarti; Nuri, Hafni Lissa
EKSPLORIUM Vol. 32 No. 2 (2011): NOVEMBER 2011
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2011.32.2.2819

Abstract

Bangka monazite processing to separate its major elements i.e. phosphate (PO4), rare earth (RE), uranium (U) and thorium (Th) through decomposition prosess with NaOH to separate the PO4 first. This prosess produces a residue of (U, Th, RE) hydroxide. Then this residue is dissolved with HCl concentrate partially at 3,7 of pH to separate the RE from U and Th. In this process 62 % of RE is dissolved. The residue of RE dissolution at 3,7 of pH still contain U, Th and RE, so continuation research needed to be done separate U, Th and RE mentioned. The purpose of this research is to determine the optimum condition of residue dissolution as product of partiel dissolution by using concentrate H2SO4. On the next research each element of U, Th and RE will be separated. The research’s parameters are dissolution time, dissolution temperature and consumption of H2SO4. The result showed that the optimum conditions were 2 hours of time, 30 oC of temperature and 100 ml of H2SO4/gram of feed with recovery 92,30 % of U, 97,15 % of Th and 93,46 % of RE.
Studi Pemisahan Thorium dari Besi dan Logam Tanah Jarang dalam Larutan Asam Nitrat dengan Ekstraksi Pelarut Menggunakan Ekstraktan Trioctylphosphine Oxide Briliant Briliant; Mubarok, Mohammad Zaki; Trinopiawan, Kurnia; Prassanti, Riesna
EKSPLORIUM Vol. 38 No. 2 (2017): NOVEMBER 2017
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2017.38.2.3924

Abstract

A series of solvent extraction experiment to separate thorium(Th) from iron (Fe) and rare earth metals (REE) using trioctylphosphine oxide (TOPO) conducted with variations of nitric acid concentration, extraction time, ratio between exctractan and diluent (g/mL), and ratio between organic solution and aqueous solution volumes (O/A), and variation of nictric acid concentration in stripping process. Thorium, iron and rare earth metals early concentration in solution feed were measured by using Inductively Coupling Plasma (ICP), Atomic Absorption Spectroscopy (AAS), dan Ultraviolet Visible Spectroscopy (UV-VIS Spectro) respectively. The nitric acid concentration was varied at 1M, 2M, 3M, 4M, and 5M. The extraction time was varied at 2, 5, 10, 15, and 20 minutes, meanwhile the ratio between extractan and diluent (g/mL) was varied at 2:100, 3:100, 4:100, 5:100, and 6:100 with O/A ratio at 1:3, 1:2, 1:1, 2:1, and 3:1. At stripping stage, the nitric acid concentration was varied at 0.1M; 0.2M; 0.3M; 0.4M; and 0.5M. The result of the experiments show that the best condition was obtained on 3M nitric acid concentration, 10 minutes extraction time, 5:100 (g/mL) extractan and diluent ratio, and 1:1 O/A ratio, that resulted in 97.26% Th extraction, 7.97% Fe extraction, and 62.15% rare earth metals extraction with βTh-Fe and βTh-REE value 273.62 and 14.43 respectively. On the stripping experiment, the highest Th stripping percentage obtained as much as 51.37% at 0.3M nitric acid concentration with Fe and REE stripping percentage up to 2.72% and 2.55% respectively.
Digesti Monasit Bangka dengan Asam Sulfat Prassanti, Riesna
EKSPLORIUM Vol. 33 No. 1 (2012): MEI 2012
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2012.33.1.676

Abstract

Technology of Bangka monazite processing with alkaline method has been mastered by PPGN BATAN with the product in the form of RE (Rare Earth) which is contain U < 2 ppm and Th 12 – 16 ppm. Hence, as comparator, the research of Bangka monazite processing with acid method using sulfuric acid has been done. The aim of this research is to obtain the optimal condition of Bangka monazite’s digestion using sulfuric acid so that all elements contained in the monazite that are U, Th, RE, PO4 dissolved as much as possible. The research parameter’s are monazite particle’s size, sulfuric acid consumption (weight ratio of monazite ore : sulfuric acid), digestion temperature, digestion time and consumption of wash water. The results showed that the optimal conditions of digestion are -250+325 mesh of monazite particle’s size, 1 : 2.5 of weight ratio of monazite ore : sulfuric acid, 190°C of digestion temperature, 3 hours of digestion time and 8 times of weight monazite’s feed of wash water with the recovery of digested U = 99.90 %, Th = 99.44 %, RE = 98.64 % dan PO4 = 99.88 %.
Pemisahan Cerium dari Logam Tanah Jarang Hidroksida Melalui Kalsinasi dan Pelindian Menggunakan HNO3 Encer Trinopiawan, Kurnia; Purwani, Maria Veronica; Anggraini, Mutia; Prassanti, Riesna
EKSPLORIUM Vol. 40 No. 1 (2019): MEI 2019
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2019.40.1.5411

Abstract

Application of Rare Earth Elements (REE) uses broadly in various fields related to modernization. It causes many companies are developing processing techniques to extract REE from rare earth mineral deposits. REE hydroxide processing into cerium oxide, lanthanum oxide, and neodymium concentrates has conducted by PSTA-BATAN in collaboration with PTBGN-BATAN. The previous economic study issued in excessive ammonia caused by the use of concentrated nitric acid in the cerium dissolution process. Therefore, process innovation is necessary to do by calcination and leaching methods using dilute HNO3. This research aims to determine the effectiveness of the calcination and leaching process with dilute HNO3. Calcination conducted at 1000°C temperatures with the observing parameters is calcination time, HNO3 concentration, and leaching rate. The result of the study is that calcination can convert REE hydroxide into REE oxide. The longer calcination time, the easier the REE oxide formed. The three hours calcination process enhances the concentration of La, Ce, and Nd from 7.80%, 28.00%, and 15.11% to 12.69%, 45.50%, and 24.45% respectively. The kinetic reaction of the RE(OH)3 calcination reaction follows a chemical reaction process with the equation y = 0.3145x + 0.0789 and R2 = 0.9497. Then, REE oxide from calcination reacted with dilute HNO3. The higher the concentration of HNO3 at various leaching levels, the better the leaching efficiency of La and Nd while Ce is impossible to leach or the leaching efficiency is close to zero. The optimum leaching process on three levels of leaching conditions is using 1 M HNO3. The leach reaction kinetics follows the core shrinkage model of the surface chemical reaction with the equation y = 0.1732x - 0.2088 and R2 = 0.9828.
Pengendapan Torium (Th) dari Monasit Bangka Setelah Proses Solvent Impregnated Resin (SIR) Prassanti, Riesna; Ani, Budi Yuli; Sumiarti; Dewita, Erlan
EKSPLORIUM Vol. 40 No. 2 (2019): NOVEMBER 2019
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2019.40.2.5648

Abstract

Alkaline processing of Bangka monazite is carried out through stages like decomposition; partial dissolution pH 3.7; partial precipitation pH 6.3; and total precipitation pH 9.8. These procesess produce sodium phosphate, Rare Earth (RE) Hydroxide, uranium (U), and thorium (Th). On decomposition procsess, 99 % of sodium phosphate had been recovered and RE Hydroxide was separated from U and Th with 85% recovery. Meanwhile, the U and Th products were still mixed so that needs to separate. Purification of Th from U in monazite had been carried out by using Solvent Impregnated Resin (SIR) method and continued by elution after SIR. The result is that Th is still in the liquid phase as thorium nitrate [Th(NO3)2] solution so it needs to be precipitated as thorium hydroxide [Th(OH)2] to facilitate the next process. Precipitation of Th after SIR process is conducted with the aim to obtain optimum precipitation condition. The supporting resin used is amberlite XAD-16 with impregnated tributyl phosphate (TBP) extractant, dilute nitric acid (HNO3) as elution reagent, and ammonium hydroxide (NH4OH) as precipitation reagent. The observed parameters are the effect of pH and precipitation time on Th recovery. The results show that the optimum precipitation conditions of Th from monazite after SIR process is on pH 1.2 and 60 minutes time, resulting recovery of 84.74 % Th, 3.26 % U, 34,74 % RE, and 8.52 % PO4.
Pengendapan Uranium pada Monasit Bangka sebagai Ammonium Diuranate (ADU) Menggunakan Gas NH3 Prassanti, Riesna; Fauzan, Ahmad Miftah; Putra, Aditya Widian; Pratama, Afiq Azfar; Dewita, Erlan; Hidayat, Rachmat Fauzi; Ani, Budi Yuli; Permana, Yoga
EKSPLORIUM Vol. 41 No. 1 (2020): MEI 2020
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2020.41.1.5879

Abstract

Monazite, as a by-product of tin mining, contains rare earth elements (REE) and radioactive elements like uranium (U) and thorium (Th). The monazite processing Research and Development at the Center for Nuclear Mineral Technology-National Nuclear Energy Agency (PTBGN-BATAN) has succeeded in separating REE as a hydroxide compound with an 85% recovery. The radioactive elements U and Th are each obtained as a product in the form of concentrated compounds of ammonium diuranate (ADU)/(NH4)2U2O7 and thorium hydroxide (Th(OH)4). In previous studies, the separation of U as ADU in monazite was carried out by the precipitation process using NH4OH solution. In this research, U will be precipitated as an ADU using NH3 gas reagents to obtain precipitation optimum conditions. Precipitation feed in the form of (U, Th, REE) sulfate solution derived from the monazite processing using the alkali or base method, which includes decomposition using NaOH, partial dissolution using HCl, and total dissolution using H2SO4. The parameters studied include the effect of NH3 gas flow rate, process temperature, and contact time on U recovery. The results showed that on the static pH-7 condition, the optimum state of U precipitation using NH3 gas is at NH3 gas flow rate of 150 ml/minutes, processing temperature of 30oC, and 15 minutes contact time with precipitation recovery of U 100%, Th 99.97%, and REE 99.93%. These results indicate that U has been taken entirely but still mixed with other elements, which are Th and REE, so that further research is needed to obtain U with high purity on optimum pH condition.
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