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Journal : Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir

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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.
Pemisahan Thorium dari Uranium pada Monasit dengan Metode Pengendapan Trinopiawan, Kurnia; Sumiarti, Sumiarti
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.2012.33.1.677

Abstract

Previous researches have obtained the monazite processing stages and resulting RE(OH)3 as a product with ± 62% of recovery, and the by products obtained in the form of a compound of thorium (Th) and Uranium (U). For further utilization, studies of U and Th separation is needed. This research is aimed to determine the optimal conditions for the separation of Th from U in monazite using the precipitation method with H2SO4 as a reagent. Stages of the process in this research consisted of grinding, decomposition, partial dissolution, total dissolution, and precipitation of Th with H2SO4. Feed solution used for precipitation is obtained from total dissolution stage with 2 different reagents are H2SO4 and HCl. Parameters of the research include the precipitating reagent (H2SO4) consumption and precipitation time. Optimal recovery results in the precipitation of sulfate feed solution are Th = 96.99% and U = 18.26% with 20 ml of H2SO4 consumption and 30 minutes of precipitation time. Optimal recovery results in the precipitation of chloride feed solution are 98.05% andU 25.03% with 20 ml of H2SO4 consumption and 30 minutes of precipitation time.
Pengendapan Unsur Tanah Jarang Hasil Digesti Monasit Bangka Menggunakan Asam Sulfat Anggraini, Mutia; Sumarni, Sumarni; Sumiarti, Sumiarti; Rusyidi, Rusyidi; Waluyo, Sugeng
EKSPLORIUM Vol. 33 No. 2 (2012): NOVEMBER 2012
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2012.33.2.2662

Abstract

Rare earth elements are elements that widely used in many products. Rare earth elements nature are not found in a free state, but they are in the complex compounds, so that chemically processing is required to separate the Rare earth elements from their complex compounds. Monazite as by product of Bangka tin process contains several major elements, such as 0.298% uranium (U), 4.171% thorium (Th), 23.712% phosphat (P2O5) and 58.97% rare earth elements (REE) oxide. These elements can be individually separated through a process of precipitation stages. The separation process used in the study is the method of acid by using sulfat acid as reagen and filtrat digestion as feeds. The process of digestion dissolve the elements U, Th, RE and phosphate from the complex compound. Rare earth elements that are disolved can be separated from the complex compounds by using sulfat acid precipitation process. The objective of research is to set the optimal conditions for the Rare earth elements precipitation with sulfat acid. The result showed that the amount of sulphuric H2SO4 which added is 3.5 times volume of feed and precipitation time is 20 minutes, percentage of precipitation recovery is 61.21 % REE, 78.46 % U, and 93.56 % PO4.
Co-Authors Afnita, Nora Andi Susanto Andrianto Andrianto Auladi, Irkham Elya Munfarida Hafni Lissa Nuri Hakim Hakim Idrus, Ilham Johendra, Meki Kurnia Trinopiawan Mukhtar, Salsabila Mutia Anggraini Nofitayanti, Nofitayanti Noviyani, Rafiqa Novizal Wendry, Novizal Pebriyenni Pebriyenni Priyono, Cipto Duwi Riesna Prassanti Rudi Afnan Rully Hidayatullah Rusyidi Rusyidi, Rusyidi Saputra, Edriagus Satria Utama, Muh. Fadel Sri Darwati Sugeng Waluyo Sumarni Sumarni Syamsurizal - - Tafiati, Tafiati Wandi, Joni Indra Yahya, Muhamad Slamet Zulherma, Zulherma