Garuda - Garba Rujukan Digital

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 : Puslitbang tekMIRA

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%.

PEMANFAATAN KARBON AKTIF UNTUK MEREDUKSI BAHAYA MERKURI DAN SIANIDA PADA PERTAMBANGAN EMAS RAKYAT Imelda Hutabarat
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 7 No 1 (2022): Jurnal Geominerba 2022
Publisher : PPSDM Geominerba

Small scale gold mining uses a lot of mercury and cyanide reagents in gold processing without sufficient knowledge and skills in its mineral processing and waste management. As a result, the processing of small scale gold mining becomes an environmental impact in the community because it is still carried out traditionally by ignoring environmental and health impacts, including the selection of inappropriate technology. Therefore, the community needs to be given education and appropriate technology related to process waste management, so that the process carried out is more effective, efficient and reduces the impact on the environment. This activity is a ccommunity service (Pengabdian kepada Masyarakat) activity, Bandung Polytechnic on Energy and Mining (PEP Bandung) with the theme of Utilization of Adsorbents of Zeolite and Activated Carbon to Reduce Industrial Waste (a case study of gold processing waste treatment in Sukabumi Regency) with the aim that the community around gold processing locations can consciously and independently manage gold processing waste so that: first, the impact on humans and the environment can be minimized and secondly, the use of process water can be reused effectively and efficiently. The method used is to test the absorption of metals dissolved in cyanide solution and see the percentage of dissolved metal absorption in activated carbon. The results obtained are that activated carbon is able to absorb metals especially mercury (Hg), gold (Au), copper (Cu), lead (Pb), zinc (Zn) and arsenic (As). As part of the social activity to the community, it has been prepared simple equipment to absorb metal dissolved in a cyanide solution that can be utilized in a waste pond of mining gold processing community in Simpenan District, Sukabumi Regency.

EVALUASI PASCADIKLAT PENGAWAS OPERASIONAL PERTAMBANGAN MINERAL DAN BATUBARA TINGKAT PERTAMA TERHADAP PERUBAHAN PERILAKU ALUMNI PT TIMAH TBK. Revi Timora Salajar; Imelda Hutabarat
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 4 No 2 (2019): Jurnal Geominerba 2019
Publisher : PPSDM Geominerba

The need for a large number of competent mining operations supervisors at PT Timah Tbk. is very much needed until now. This is an embodiment of fulfilling the mandate in the Minister of Energy and Mineral Resources Regulation No. 26 of 2018 concerning the Implementation of Good Mining Engineering Rules, Article 7, “every mining business licence must have the competent mining technical personnel in accordance with the provisions of laws and regulations”. As a result of these regulations, PT Timah Tbk seeks to include its employees in the Training and Certification of the First Operational Supervisor at PPSDM Geominerba. This post-training evaluation was carried out at PT Timah, Tbk. Located in Sungailiat City, Bangka Belitung Province. The results of the post-training evaluation specifically found that the practice time was considered to be insufficient. They hope that there will be field observations to implement training courses for conducting inspections. In addition, the duration of mining safety analysis needs to be added.

EVALUASI PASCADIKLAT INDUSTRI PENGOLAHAN DAN PEMURNIAN MINERAL PPSDM GEOMINERBA TERHADAP PENINGKATAN KOMPETENSI ALUMNI PADA INDUSTRI SMELTER (LOKUS: SULAWESI TENGGARA) Imelda Hutabarat; Revi Timora Salajar
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 4 No 1 (2019): Jurnal Geominerba 2019
Publisher : PPSDM Geominerba

The development of the processing and refining industry cannot be separated from the mandate of Law No. 4 of 2009 concerning Mineral and Coal Mining which requires domestically is obliged to process and refine minerals and coal in the country. There are still few schools that specialize in mining and metallurgy. Including high school (SMA) and vocational high school (SMK) still do not have a metallurgical curriculum. Thus there are competency gaps possessed by high school /vocational school students to enter metallurgical industries. Therefore, to reduce the competency gap possessed by high school / vocational school graduates in the locations around the smelter industry that are built, vocational training is needed to be able to provide the knowledge, skills and attitudes needed by high school/ vocational graduates to be accepted in the smelter industry. Post-Training Evaluation was carried out in Southeast Sulawesi province, where the rapid development of the smelter industry in this province. The results of the post-training evaluation specifically found that the practice time in the training was considered to be added. Even though it is quite a large amount of practice time allocated to education and training (50%), the skills provided are not too specific as those done in companies in South Sulawesi.

PELINDIAN SIANIDASI TERHADAP BIJIH EMAS HASIL OKSIDASI DENGAN MENGGUNAKAN HIDROGEN PEROKSIDA Revi Timora Salajar; Imelda Hutabarat
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 3 No 2 (2018): Jurnal Geominerba - 2018
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58522/ppsdm22.v3i2.87

The low yield of gold in the direct cyanidation process of the sulfide refractory gold ore has led to various attempts to modify the cyanidation process directly to increase the gold yield. One of them is by conducting a pre-processed of sulfide refractory gold ore with the use of oxidative materials before the cyanidation process. The effect of hydrogen peroxide (H2O2) as an oxidative material on pre-processed sulfide refractory gold ore has been investigated. The important variables in the test are the concentration of hydrogen peroxide, cyanide, pH of the leaching solution, and particle size. The concentration of hydrogen peroxide and cyanide has a significant effect on the level of gold yield. An optimum gold yield was achieved at 0.75 M of the hydrogen peroxide concentration with a cyanide concentration of 0.14%. This gold yield has increased the recovery process from 70.37% (without the pretreatment) to 85.19% (with a pretreatment process). The results of this study provide the possibility that the direct cyanidation of sulfide refractory gold ores with the use of pre-treated oxidative materials allows it to remain competitive in its commercial applications.

OPTIMALISASI PERALATAN PENGOLAHAN MINERAL DI KAMPUS LAPANGAN CIPATAT PADALARANG Imelda Hutabarat; Revi Timora Salajar
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 3 No 1 (2018): Jurnal Geominerba - 2018
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58522/ppsdm22.v3i1.93

A good quality of training requires a well-prepared equipment, infrastructure, and facilities, including the Indonesian National Working Competency Standards (RSKKNI), Curriculum Standards, and Modules and Competency Testing Material (MUK). The purpose of this paper is to design the flowing process by preparing the equipment, infrastucture, and facilities of the Mineral Processing field in PPSDM Geominerba Campus Cipatat Padalarang to be utilized optimally for the tainings held by PPSDM Geominerba. The design preparation begins with a literature study of the raw material types for the mineral processing process by considering its availability, mineral types, the processing plan, and the necessary equipment. Furthermore, the arrangement of the flowing process for non-metallic minerals (limestone) and metallic minerals (gold) is done which then can set the position of the equipment in the Mineral Processing field of Campus Cipatat Padalarang, West Java. Through this paper, the optimization of mineral processing equipment in Campus Cipatat Padalarang can be realized, especially for Non-Metal Minerals Processing Training (limestone) and Metal Minerals Processing Training (gold). Limestone can be processed to obtaine a fine concentrates which is ready for the combustion process to produce a fine limestone which meets the subsequent industries. Meanwhile, the metal minerals (gold) can be processed through the comminution process with jaw crusher and ball mill. The process can be done with the shaking table to produce a gold concentration which is ready for the gold smelting.

KARAKTERISASI KONSENTRAT TEMBAGA INDONESIA UNTUK DIKLAT PENINGKATAN NILAI TAMBAH TEMBAGA Imelda Hutabarat
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 1 No 1 (2017): Jurnal Geominerba - 2017
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58522/ppsdm22.v1i1.119

Indonesia many copper reserves which are spread in certain locations along the ‘ring of fire’, the most active seismic region in the world which is started from the west of Sumatera up to east of Papua. Nowadays, the reserves have been mined extensively in Batu Hijau, Nusa Tenggara Barat and Erzberg and Grasberg Papua. The goal of this paper is to present the results of Indonesian copper concentrate characterization for further education and research purposes.This characterization is considered important in determining metal extraction flow process for Indonesian copper concentrate. Materials that are used in this study are copper concentrates after flotation process. These copper concentrates, with mineralogical composition of chalcopyrite and pyrite, contain various precious metals, such as gold, silver, platinum, palladium, selenium, tellurium, and some other metals in several oxidation states. The characterization method includes chemical analysis using X-ray fluorescence spectroscopy (XRF) for basic metals and inductively coupled plasma mass spectrometry (ICP-MS) special for precious metals. While, X-ray diffraction (XRD) is used for the mineralogical phases. Subsequently, the element visualization in element sample was characterized by scanning microscopic with energy dispersive X-ray spectrometer (SEM-EDX) to analyse the condition of elements after treatments in certain temperatures.

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

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

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

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.

Title

Found 10 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 10 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 10 Documents
Search