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All Journal Alchemy Jurnal Penelitian Kimia Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir Indonesian Journal of Chemical Science Jurnal Rekayasa Proses
Moch. Setyadji
Badan Tenaga Nuklir Nasional Pusat Sains dan Teknologi Akselerator
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science Materials Science & Nanotechnology Social Sciences

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PENGARUH PROSEN TBP DAN PERBANDINGAN UMPAN DAN PELARUT PADA EKSTRAKSI URANUIM-TORIUM PROSES THOREX SETYADJI, MOCH.; ., DAMUNIR; ., MASHUDI
Alchemy Jurnal Penelitian Kimia Vol 1, No 1 (2002)
Publisher : Alchemy Jurnal Penelitian Kimia

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Abstract

Abstrak (ina) :Telah dilakukan penelitian ekstraksi uranium dan torium dalam fase air siklus satu proses thorax menggunakan pelarut tributil phosfat yang diencerkan dalam diluen organic (kerosin). Alat yang digunakan adalah ekstraktor satu stage. Dipelajari pengaruh prosen tributil posfat sebagai pelarut dan perbandingan umpan dan pelarut terhadap efisiensi ekstraksi dan koefisien distribusi uranium dan torium. Hasil percobaan menunjukkan bahwa prosen tributil posfat maupun perbandingan umpan dan pelarut sangat berpengaruh terhadap efisiensi ekstraksi dan koefisien distribusi uranium dan torium. Hasil yang relative paling baik diperoleh pada penggunaan TBP 50-60% dan perbandingan umpan dan pelarut 1:3. Pada kondisi tersebut di atas di peroleh efisiensi ekstrak uranium danj torium sekitar 90% dan 90,4%, koefisien dan distribusi uranium dan koefisien distribusi torium, masing-masing 9,0 dan 9,4.
Pengaruh Tri - n - Oktil Posfin Oksida dan Tingkat Ekstraksi pada Pemurnian Konsentrat Thorium Purwani, M.V.; Setyadji, Moch.
Eksplorium Buletin Pusat Teknologi Bahan Galian Nuklir Vol 36, No 2 (2015): November 2015
Publisher : Pusat Teknologi Bahan Galian Nuklir - BATAN

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Telah dilakukan ekstraksi konsentrat thorium oksalat hasil olah monasit memakai ekstraktan Tri – n - Oktil Posfin Oksida (TOPO).  Pengotor  yang paling banyak  terkandung dalam konsentrat thorium oksalat adalah cerium (Ce) dan lantanum (La).  Tujuan penelitian ini adalah untuk memurnikan thorium (Th) dengan memisahkan Ce dan La dengan cara ekstraksi. Ekstraksi dilakukan secara batch dan bertingkat. Larutan umpan atau fase air adalah 10 gram konsentrat Th oksalat yang dilarutkan dalam 10,08 M HNO3 sehingga volume menjadi 100 mL dan fase organik adalah TOPO dalam kerosen.  Stripping setiap tingkat ekstraksi dilakukan tiga kali, yaitu stripping pertama memakai air, stripping kedua memakai asam oksalat 5%, dan stripping ketiga memakai air. Waktu ekstraksi setiap tingkat 15 menit dan waktu stripping setiap tingkat 5 menit dengan perbandingan fase air dengan fase organik adalah 1 berbanding 1. Parameter yang diteliti  adalah persentase TOPO dalam kerosen dan jumlah tingkat ekstraksi. Pemakaian TOPO dalam kerosen yang optimum 5% dan jumah tingkat ekstraksi 3. Pada ekstraksi I diperoleh konsentrat Ce dan pada tingkat ekstraksi II dan III diperoleh Th.  Efisiensi ekstraksi Th  tingkat II sebesar 39,76% dan efisiensi ekstraksi Th tingkat III 26,33%. Koefisien distribusi (Kd) Th tingkat ekstraksi II adalah 0,7587 dan Kd Th tingkat ekstraksi III 1,0096. Efisiensi ekstraksi Th total adalah 80,08%, efisiensi ekstraksi Ce total 56,12%,  efisiensi ekstraksi La total 1,54.  Faktor pisah (FP) Th – Ce pada ekstraksi I adalah1,00, FP Th – La pada ekstraksi I  92,07, FP Th – Ce pada ekstraksi II adalah 250,24 dan FP Th – La  pada ekstraksi II adalah ∞,  FP Th – Ce pada ekstraksi III 124,22 dan FP Th – La pada ekstraksi III adalah ∞. Faktor pisah total Th – Ce sebesar 1,4270 dan Faktor pisah total Th – La 47,0459. Kadar Th oksalat pada ekstraksi II sebesar 97,06%, kadar Th oksalat pada ekstraksi III 98,00 %. Kata kunci: ekstraksi, konsentrat Th, TOPO
Leaching Time and Nitric Acid Concentration Effect on the Separation of Lanthanum and Neodymium Elements from Neodymium Concentrates Astuti, Indri Puji; Mahatmanti, F. Widhi; Setyadji, Moch.; Sudibyo, Raden
Indonesian Journal of Chemical Science Vol 10 No 1 (2021)
Publisher : Universitas Negeri Semarang

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Abstract

The process of separating the elements of lanthanum (La) and neodymium (Nd) from neodymium concentrate (Nd(OH)3) by calcination and leaching processes to determine the effect of leaching time and HNO3 concentration. The separation process begins with calcination of the Nd(OH)3 concentrate, which functions to decompose the neodymium oxide concentrate into neodymium oxide concentrate. The process was continued with leaching with variations in leaching time (5, 10, 15 and 20 minutes) using 1 M HNO3. The results of the separation of La and Nd with the optimum time were used for leaching with variations in the concentration of HNO3 (0.5, 1, 1.5 and 2 M). During the leaching process the factor that was kept constant was the ratio of sample solids to 1: 5 HNO3 solution, using room temperature and a stirring speed of 150 rpm. The La and Nd elements separated the best at a leaching time of 10 minutes and a concentration of 1 M HNO3 with the magnitude of the leaching efficiency was 63.140% and 56.238%.
Cerium, Neodimium, and Lanthanum Leaching from Rare Earth Oxides (REO) using Hydrochloric Acid Aulia, Muhammad Azmi; Kurniawan, Cepi; Setyadji, Moch.
Indonesian Journal of Chemical Science Vol 10 No 2 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v10i2.45818

Abstract

Rare earth metal hydroxide (REOH) is a mixture of the elements lanthanide, yttrium, and scandium produced from the processing of monazite sand. This mixture has benefits in the modern technology industry, especially elements of Ce, La, and Nd. Separation of Ce, La, and Nd from the mixture has been carried out, but it has several drawbacks with the large use of chemicals that have an impact on the environment from the results of their processing waste and the length of time it takes, so the best solution is needed to overcome it. The perfect solution in the process of separating Ce, La, and Nd from REOH is leaching. Leaching is the extraction of acids with bases to form salt and water. This research begins with the REOH calcination process at a temperature of 1000⁰ C for 2 hours to evaporate volatiles and decompose the compounds. The results of calcination were leached using hydrochloric acid with a concentration variation of 0.3-1.2 M, temperature 30-75 ° C, a ratio of REO and solvent 1:5, and time variation of 5-20 minutes to optimize leaching efficiency. The results of leaching in residues were analyzed by XRF. The optimum leaching of the variation of the concentration of hydrochloric acid 1,2 M for 20 minutes resulted in the leaching efficiency of La and Nd respectively 33,297% dan 26,503%, and the leaching efficiency of Ce was 10,153% of the concentration of hydrochloric acid 0,9 M for 20 minutes. At a temperature variation of 75⁰ C and a time of 10 minutes, the leaching efficiency La and Ce were 55,87% dan 0,04%, respectively. The efficiency of Nd at 45⁰C for 20 minutes was 26,93%.
Cerium, Neodimium, and Lanthanum Leaching from Rare Earth Oxides (REO) using Hydrochloric Acid Aulia, Muhammad Azmi; Kurniawan, Cepi; Setyadji, Moch.
Indonesian Journal of Chemical Science Vol 10 No 2 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v10i2.45818

Abstract

Rare earth metal hydroxide (REOH) is a mixture of the elements lanthanide, yttrium, and scandium produced from the processing of monazite sand. This mixture has benefits in the modern technology industry, especially elements of Ce, La, and Nd. Separation of Ce, La, and Nd from the mixture has been carried out, but it has several drawbacks with the large use of chemicals that have an impact on the environment from the results of their processing waste and the length of time it takes, so the best solution is needed to overcome it. The perfect solution in the process of separating Ce, La, and Nd from REOH is leaching. Leaching is the extraction of acids with bases to form salt and water. This research begins with the REOH calcination process at a temperature of 1000⁰ C for 2 hours to evaporate volatiles and decompose the compounds. The results of calcination were leached using hydrochloric acid with a concentration variation of 0.3-1.2 M, temperature 30-75 ° C, a ratio of REO and solvent 1:5, and time variation of 5-20 minutes to optimize leaching efficiency. The results of leaching in residues were analyzed by XRF. The optimum leaching of the variation of the concentration of hydrochloric acid 1,2 M for 20 minutes resulted in the leaching efficiency of La and Nd respectively 33,297% dan 26,503%, and the leaching efficiency of Ce was 10,153% of the concentration of hydrochloric acid 0,9 M for 20 minutes. At a temperature variation of 75⁰ C and a time of 10 minutes, the leaching efficiency La and Ce were 55,87% dan 0,04%, respectively. The efficiency of Nd at 45⁰C for 20 minutes was 26,93%.
Leaching Time and Nitric Acid Concentration Effect on the Separation of Lanthanum and Neodymium Elements from Neodymium Concentrates Astuti, Indri Puji; Mahatmanti, F. Widhi; Setyadji, Moch.; Sudibyo, Raden
Indonesian Journal of Chemical Science Vol 10 No 1 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The process of separating the elements of lanthanum (La) and neodymium (Nd) from neodymium concentrate (Nd(OH)3) by calcination and leaching processes to determine the effect of leaching time and HNO3 concentration. The separation process begins with calcination of the Nd(OH)3 concentrate, which functions to decompose the neodymium oxide concentrate into neodymium oxide concentrate. The process was continued with leaching with variations in leaching time (5, 10, 15 and 20 minutes) using 1 M HNO3. The results of the separation of La and Nd with the optimum time were used for leaching with variations in the concentration of HNO3 (0.5, 1, 1.5 and 2 M). During the leaching process the factor that was kept constant was the ratio of sample solids to 1: 5 HNO3 solution, using room temperature and a stirring speed of 150 rpm. The La and Nd elements separated the best at a leaching time of 10 minutes and a concentration of 1 M HNO3 with the magnitude of the leaching efficiency was 63.140% and 56.238%.
Dual-synergistic effects of citric acid on atmospheric leaching of manganese ores Widi Astuti; Rofiek Mufakhir, Fika; Iman Supriyatna, Yayat; Daulay, Amru; Setyadji, Moch.; Sofiana Dewi, Jilda
Jurnal Rekayasa Proses Vol 19 No 2 (2025): Volume 19, Number 2, 2025
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.17590

Abstract

In the current study, a leaching of manganese from Indonesian manganese ores using citric acid as leaching reagent without the addition of reducing agent was investigated. Citric acid was being used as a leaching reagent and reducing agent at same time due to its reducing power. Several leaching parameters were investigated to obtain the optimum condition of citric acid leaching of manganese from those manganese ores. Low grade manganese ores from two mining areas in Indonesia contained 36.77% Mn (WK ore) and 12.5% (TG ore) with different mineral types can be leached using citric acid as leaching reagent without addition of reducing agent. The optimum manganese recovery was obtained at around 76% and 69% respectively for WK ore and TG ore with citric acid of 1M, 5% of pulp density, 150 rpm of shaker speed, 30oC of leaching temperature, 1 hour of leaching period, and <75 µm of ore particle size. This condition was also selective for iron recovery leaching. This experiment proves that citric acid has a dual-synergistic effect as an effective leaching reagent and reducing agent at the same time for manganese leaching from manganese ores.
Co-Authors Astuti, Indri Puji Aulia, Muhammad Azmi Cepi Kurniawan Damunir . Daulay, Amru F Widhi Mahatmanti Iman Supriyatna, Yayat M.V. Purwani Mashudi , Rofiek Mufakhir, Fika Sofiana Dewi, Jilda Sudibyo, Raden Widi Astuti