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Imelda Eva Roturena Hutabarat
Politeknik Energi Dan Pertambangan Bandung
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Journal : Jurnal Teknologi Mineral dan Batubara

 1 
KAJIAN PEMANFAATAN AMPAS PENGOLAHAN BIJIH TEMBAGA PT. FREEPORT INDONESIA SEBAGAI KATALIS PADA PROSES PENCAIRAN BATUBARA NINING S. NINGRUM; MIFTAHUL HUDA; IMELDA E.R. HUTABARAT
Jurnal Teknologi Mineral dan Batubara Vol 6 No 1 (2010): Jurnal Teknologi Mineral dan Batubara Edisi Januari 2010
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol6.No1.2010.875

Abstract

Dalam rangka mempertahankan kestabilan suplai bahan bakar minyak untuk kebutuhan domestik akibat semakin menipisnya cadangan minyak di Indonesia, maka perlu dilakukan berbagai upaya untuk mencari bahan  bakar alternatif pengganti minyak. Pencairan batubara merupakan salah satu upaya untuk mendapatkan minyak dari batubara. Katalis adalah faktor penentu dalam pencairan batubara, untuk mendapatkan produk minyak batubara agar  lebih ekonomis karena katalis berfungsi mempercepat reaksi dan meningkatkan hasil konversi minyak. Katalis yang baik untuk pencairan batubara adalah katalis berbasis besi, karena  besi  oksida  dengan  penambahan  sulfur  dan  besi sulfida dapat membentuk fasa aktif pyrrhotite (Fe1-xS) serta dapat meningkatkan proses pencairan batubara. Sumber katalis berbasis besi terdapat banyak di Indonesia, salah satunya berasal dari ampas proses pengolahan bijih tembaga PT. Freeport Indonesia (PT. FI). Hasil analisis kimia menunjukkan adanya mineral magnetit (Fe3O4) dan pirit (FeS2) sebagai sumber katalis berbasis besi yang mengandung besi (Fe) dan sulfur (S). Penelitian ini bertujuan untuk memanfaatkan ampas PT. FI sebagai katalis pencairan batubara dengan memfokuskan pada pengamatan pengaruh nisbah sulfur/besi (S/Fe) dan % besi terhadap produk pencairan. Hasil penelitian menunjukkan nisbah S/Fe yang rendah dapat meningkatkan hasil konversi gas dan distilat minyak. Konversi gas dan minyak pada nisbah S/Fe 0,90 sebesar 64,3%, sedangkan pada nisbah S/Fe 2,06 sebesar 56,17 %. Peningkatan persentase besi pada nisbah S/Fe yang tetap, tidak berpengaruh banyak terhadap hasil konversi gas dan distilat minyak, dengan rata-rata perolehan gas dan distilat minyak sebesar 61,3% pada kadar besi 0,78 - 3,12%.
POTENSI DEPOSIT WOLFRAM DI INDONESIA: STUDI KASUS TOBOALI - BANGKA SELATAN Imelda Eva Roturena Hutabarat; Sabtanto Suprapto; Priatna Priatna; Maryono Maryono; Rudiyansah Rudiyansah
Jurnal Teknologi Mineral dan Batubara Vol 19 No 2 (2023): Jurnal Teknologi Mineral dan Batubara Edisi Mei 2023
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol19.No2.2023.1478

Abstract

Bangka island is one of the islands in the Southeast Asian Tin Belt that makes Indonesia the largest tin (Sn) producer in the world. The carrier of wolframite is a by product mineral of the mineral tin (cassiterite). This study aims to study the presence and type of wolfram-as by product in the tin deposits on Bangka island. The research area was conducted on the eastern edge of Klabat Granite in Kepoh Village, Toboali District, South Bangka, at coordinates of 106o 31' 58" BT, 2o 56' 56 " LS. The result shows the presence of wolfram with grade of wolfram in veins reaching 8287 ppm. Wolfram was identified as an associated mineral in the tin mineralization system in Toboali along with rare earth metals (LTJ), molybdenum (Mo) and platinum (Pt). The results of analytical studies (UV, XRF, ICP OES, mineragraphy) on Toboali area minerals show the presence of wolfram in ores, concentrates, slag, and floor crusts. The identified wolfram minerals are wolframite (Fe.Mn)WO4 and scheelite (CaWO4) which are characterized through differences in properties such as color, fluorosence, magnetic, specific gravity and hardness values. The results obtained showed the presence of wolfram in Toboali area with wolfram content of 742 ppm in ore and also in the tin process, specifically in slag II of 1.02%. In addition, wolfram is indicated on the furnace floor and on the anode slime. Indonesia as one of the countries that owns wolfram minerals needs to continue the wolfram extraction process so that Indonesia receive the added value from its minerals.
PENINGKATAN PERSEN EKSTRAKSI PROSES PELINDIAN EMAS DAN PERAK MENGGUNAKAN VARIASI TEKNIK PENINGKATAN OKSIGEN TERLARUT SPARGER LANCE, PEROXIDE INJECTION DAN HIGH SHEAR REACTOR Dikri Fajar Ramadhan; Imelda Eva Roturena Hutabarat; Denny Lumban Raja; Sulaeman
Jurnal Teknologi Mineral dan Batubara Vol 20 No 1 (2024): Jurnal Teknologi Mineral dan Batubara Edisi Januari 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol20.No1.2024.1512

Abstract

Cyanidation leaching has become the most intriguing technique for extracting gold and silver. In the gold and silver cyanidation process, PT Indo Muro Kencana (IMK) implements three (3) dissolved oxygen (DO) enhancement techniques. The concentration of DO typically becomes the limiting factor in the gold cyanidation process. The use of a pressurized system can also increase the DO concentration in water. Oxygen injection techniques with a sparger lance (standard/STD), peroxide injection (PRX), and high shear reactor (Aachen assisted leach/AAL) are employed to optimize the cyanidation process due to the increasingly complex characteristics of the processed ore since 2021. The use of a high shear reactor is the latest technique implemented since April 2022, following the previous implementation of peroxide injection and sparger lance by PT IMK. The objective of this study is to determine the extraction percentage and its stability in producing extraction percentages with different ore compositions. The oxygen used for each technique is the same, approximately 548 kg/hour flow rate, 90%-93% purity, and 4-6 KPa pressure. A series of leach tests are conducted to observe the extraction percentage of gold and silver. Based on the conducted tests, the reactor high shear technique yields the highest extraction percentages for gold and silver, namely 97.06% and 82.82% respectively. Leaching with the high shear reactor technique resulted in a higher percent extraction stability than the leaching process using the other two techniques.
Co-Authors Denny Lumban Raja Dikri Fajar Ramadhan Maryono Maryono MIFTAHUL HUDA NINING S. NINGRUM Priatna Priatna Revi Timora Salajar Rudiyansah Rudiyansah Sabtanto Suprapto Sulaeman