Article Per Year (5 Year)
p-Index From 2020 - 2025
0
P-Index
This Author published in this journals
All Journal Ganendra: Majalah IPTEK Nuklir Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Maria Veronica Purwani
Unknown Affiliation
Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Energy Engineering Materials Science & Nanotechnology Other

Published : 5 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 5 Documents
Search

 1 
KINETIKA PELARUTAN ITRIUM HIDROKSIDA DALAM HCl Maria Veronica Purwani; Suyanti Suyanti
GANENDRA Majalah IPTEK Nuklir Volume 14 Nomor 1 Januari 2011
Publisher : Website

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (246.492 KB) | DOI: 10.17146/gnd.2011.14.1.29

Abstract

KINETIKA PELARUTAN ITRIUM HIDROKSIDA DALAM HCl. Telah dilakukan penelitian pelarutan konsentratlogam tanah jarang hidroksida dari pasir senotim dalam HCl. Kandungan Itrium hidroksida yang paling banyak dalamkonsentrat logam tanah jarang hidroksida hasil olah pasir senotim. Tujuan penelitian ini untuk mengetahui konstantekecepatan reaksi pelarutan itrium hidroksida dalam HCl. Parameter yang diteliti adalah suhu reaksi dan konsentrasiY (Y0) dalam konsentrat logam tanah jarang hidroksida sebagai umpan. Dari data hubungan waktu dengankonsentrasi Y dalam HCl (Y) pada berbagai variasi suhu dan konsentrasi dapat disimpulkan bahwa konstantakecepatan reaksi sangat dipengaruhi suhu dan konsentrasi pereaksi. Reaksi pelarutan keseluruhan Itrium hidroksidadalam konsentrat logam tanah jarang hidroksida hasil olah pasir senotim memakai HCl merupakan reaksi orde dua.Hubungan konstanta kecepatan orde dua (k) dengan suhu (1/T) merupakan fungsi eksponensial sehinggapersamaan Arhenius menjadi k = 0,8954e-87,7658/RT dan dapat dinyatakan juga dalam bentuk garis lurus - ln k =(1055,6/T) + 2,6088 dengan koefisien korelasi 0,8954 Dari hasi perhitungan diperoleh harga energi aktivasi sebesar87,762584 kkal/mol.0K. Hubungan konstanta kecepatan orde dua dengan konsentrasi merupakan fungsipolinomial k = -4,10-5(Y0)2 + 0,0032 (Y0) – 0,0194 dengan koefisien korelasi = A = 0,9807.
PENGARUH HNO3 DAN TINGKAT EKSTRAKSI PADA PENINGKATAN Ce DALAM KONSENTRAT CERI HIDROKSIDA MEMAKAI TBP Maria Veronica Purwani; Dwiretnani Sudjoko; Suyanti Suyanti
GANENDRA Majalah IPTEK Nuklir Vomor 10 Nomor 1 Januari 2007
Publisher : Website

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (256.606 KB) | DOI: 10.17146/gnd.2007.10.1.156

Abstract

PENGARUH HNO3 DAN TINGKAT EKSTRAKSI PADA PENINGKATAN Ce DALAM KONSENTRAT CERIHIDROKSIDA MEMAKAI TBP. Telah dilakukan ekstraksi konsentrat Ce(OH)4 hasil olah pasir monasit. Ceri hidroksidadilarutkan dalam asam nitrat sebagai fase air dan tri butil fosfat (TBP) sebagai ekstraktan atau fase organik. Ekstraksidilakukan secara bertingkat dan striping dilakukan tiga kali memakai air dan asam oksalat 5%. Parameter yang ditelitiadalah keasaman dan jumlah tingkat ekstraksi. Efisiensi ekstraksi Ce dan faktor pisah (FP) Ce-Th terbesar diperolehpada ekstraksi bertingkat 500 gram Ce(OH)4 dalam 5.000 ml HNO3 7 M memakai 15% TBP–kerosen. Ekstraksidilakukan selama 15 menit dengan kecepatan pengadukan 150 rpm dan striping dilakukan 3 kali memakai air danasam oksalat 5 %, jumlah tingkat ekstraksi II. Berat FS yang diperoleh pada ekstraksi II = 115,4589 gram dan beratfase striping (FS) pada ekstraksi II = 103,3786 gram. Kadar Ce rata-rata pada ekstraksi I = 82,95% (kadar awal Ce =50,79%,) Th = 3,83%, La = 0% dan Nd = 0,1% dan kadar Ce pada ekstraksi II = 73,92%, Th = 4,55%, La= 1,48%, Nd= 0,41%. Efisiensi Ce pada ekstraksi I = 39,98%, efisiensi Ce pada ekstraksi II = 29,34%, Kd Ce pada ekstraksi I =0,6661, Kd Ce pada ekstraksi II = 0,9583. Pada ekstraksi I FP Ce – Th = 6,4670, FP. Ce – La = mendekati ∞ dan FPCe – Nd = 80,2530 pada ekstraksi II FP Ce – Th = 8,2816, FP Ce – La = 31,9333 dan FP Ce – Nd = 22,9808.
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.
Kajian Konsep Teknologi Pengolahan Pasir Zirkon Lokal yang Mengandung Monasit, Senotim dan Ilmenit Poernomo, Herry; Biyantoro, Dwi; Purwani, Maria Veronica
EKSPLORIUM Vol. 37 No. 2 (2016): NOVEMBER 2016
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2016.37.2.3054

Abstract

The existence of zircon (ZrSiO4) in the nature is mostly associated with some of the valuable oxide compounds (VOC), such as TiO2 and rare earth oxides (REO). The existence of natural minerals in Indonesia containing zirconium (Zr) and REO lies in 13 regions, ranging from Aceh to West Papua province. Based on those aforementioned aspects, the goal of this research is to conduct the study of integrated technology of local zircon sand processing containing TiO2 and REO. The study was conducted by analyzing the content of VOC in zircon sand samples from the areas of Landak and Tumbang Titi West Kalimantan and Bangka by using XRF. Based on the content of VOC in this zircon sand, it can be predicted that the zircon sand from the area of Landak and Tumbang Titi West Kalimantan and Bangka contains mineral zircon (ZrSiO4), ilmenite (FeTiO3), monazite (LREE, Th)PO4, and xenotime (HREE, Th)PO4. Based on these types of mineral, the flow chart of beneficiation technology process to increase the concentration of each mineral and the flow chart of zircon concentrate process into ZrO2(zirconia) and ZrOCl2.8H2O (zirconium oxychloride) industrial grade and zirconia and zirconium chemicals nuclear grade, ilmenite into TiO2, monazite into Nd2O3, and Th(OH)4 concentrate, xenotime into Y2O3, Gd2O3, and Th(OH)4 concentrate are obtained in one area of pilot plant or an integrated factory. The results of the study concluded that the concept of local processing of zircon sands containing monazite, xenotime, and ilmenite can be either integrated in the region with the results of multi-product plant. If it can be realized in Indonesia with the addition of an integrated waste water treatment system, then in addition to safe for the environment can also save on production costs and give economic added value for shareholders zircon mining permit.
Ekstraksi Pemisahan Neodimium dari Samarium, Itrium dan Praseodimium Memakai Tri Butil Fosfat Purwani, Maria Veronica; Suyanti, Suyanti
EKSPLORIUM Vol. 38 No. 1 (2017): MEI 2017
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2017.38.1.3035

Abstract

The extraction of Nd(OH)3 (neodymium hydroxide) concentrate containing Y (yttrium), Sm (samarium) and Pr (praseodymium) as product of monazite processed has been done. The purpose of this study is to determine the separation of Nd from Y, Pr and Nd Sm in Nd concentrate. The aqueous phase was concentrated Nd (OH)3 in HNO3 and extractant while organic phase was Tri Butyl Phosphate (TBP) in kerosene. Parameters studied were pH and concentration feed, concentration of TBP in kerosene, extraction time and stirring speed. The result showed that the optimization of separation extraction neodymium from samarium, yttrium and praseodymium in Nd(OH)3 concentrated with TBP, obtained the optimum condition of pH = 0.2, concentration of feed 100 g /L, concentration of TBP in kerosene 5%, extraction time 15 minutes and stirring speed 150 rpm. With the conditions, Separation Factor (SF) obtained for Nd-Y, Nd-Pr, Nd-Sm are 2.242, 4.811, 4.002 respectively, while D and extraction efficiency of Nd are 0.236 and 19.07%.
Co-Authors Dwi Biyantoro Dwiretnani Sudjoko Herry Poernomo Kurnia Trinopiawan Mutia Anggraini Riesna Prassanti Suyanti Suyanti Suyanti Suyanti