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All Journal Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin Indonesian Mining Journal Teknologi Indonesia Metalurgi Jurnal Teknologi Bahan dan Barang Teknik Journal Research of Social Science, Economics, and Management Innovative: Journal Of Social Science Research Indonesian Mining Journal JURNAL REKAYASA KIMIA & LINGKUNGAN
Fajar Nurjaman
UPT Balai Pengolahan Mineral Lampung, LIPI Jln. Ir. Sutami Km. 15 Tanjung Bintang, Lampung Selatan, 35364
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Journal : Indonesian Mining Journal

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DAMPAK PENINGKATAN PANAS DAN JENIS REDUKTAN TERHADAP SAPROLIT: STUDI PENDAHULUAN Bahfie, Fathan; Manaf, Azwar; Astuti, Widi; Nurjaman, Fajar; Prasetyo, Erik; Susanti, Diah; Sipahutar, Wahyu Solafide
Indonesian Mining Journal Vol 27 No 1 (2024): Indonesian Mining Journal, April 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol27.No1.2024.1533

Abstract

Indonesia significantly contributes to the global electric vehicle battery market due to its substantial medium- and low-grade nickel reserves. This study utilized saprolitic nickel ore from Halmahera, Maluku, Indonesia. However, the research on saprolite needs some improvements due to its complex mineral composition, which affected on the roasting process significantly. Therefore, a thorough understanding of the properties of laterite ores is critically important, particularly concerning laterite pre-reduction processes. The ore was finely sieved to a particle size of less than 100 mesh and then heated at temperatures of 250, 900, and 1150°C with the variation of reductant (anthracite and palm kernel charcoal). Extensive mineralogical analysis was conducted using X-ray diffraction (XRD), X-ray fluorescence (XRF), and scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS). The analysis of saprolite showed that it contains about 1.82% nickel, 30.47% iron, 10-20% magnesium, 4.86% aluminum, and 8.1% silicon by weight. Its mineral composition is mainly 53.1% goethite, 38.3% lizardite, and 8.7% quartz. The study found that goethite in saprolite was transformed into hematite around 250°C. At 900°C, the forsterite was crystallized, and at 1150°C, the ferronickel was formed. The transformation of lizardite is important as it affected on nickel diffusion within the iron matrix, which impacted on the material's properties. A thermal upgrading method with reductants like anthracite and palm kernel charcoal was used at lower temperatures to enhance the properties of saprolite. These findings provided valuable insights into saprolite's mineralogical composition and behavior, potentially offering improvements in various industrial processes and applications.
BENEFISIASI FISIK PADA PASIR KROMIT KADAR RENDAH MENGGUNAKAN MEJA GOYANG DAN DAVIS TUBE Herlina, Ulin; Nurjaman, Fajar; Suharno, Bambang; Mesah, Febriyani; Zulqoernain, Muhammad Syahreyzi Pashey; Al Fahmi, Muhammad Ridwan; Yuhelda; Suseno, Triswan; Bahfie, Fathan; Handoko, Anton Sapto; Zul Hakim, Hafid; Arham, La Ode
Indonesian Mining Journal Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No2.2025.1672

Abstract

The rapid growth of the global steel industry has significantly intensified the demand for the metallurgical-grade chromite ore required for ferrochrome production. This surge has led to a depletion of high-grade chromite reserves, necessitating the utilization of low- and medium-grade chromite to support a stable raw material supply for ferrochrome. This research was conducted to determine the characteristics of the ore and to analyze the effects of physical beneficiation processes using shaking table and Davis tube in enhancing the chromium (Cr) grade and the Cr:Fe ratio of low-grade chromite sand from Morowali, Central Sulawesi. The characterization process was conducted using XRF, XRD, and SEM-EDS. Experimental parameters for the shaking table included variations in table inclination and water flow rate, while magnetic separation was analyzed across various electric current intensities. The optimal shaking table test results were achieved at an inclination of 7.5° with a water flow rate of 18 liters/minute. In contrast, the optimal test using the Davis tube was obtained at an electric current of 0.4 amperes (660 gauss). This integrated process successfully increased Cr grade from 8.5% to 20.77% (corresponding to Cr2O3 30.36%) and improved the Cr:Fe ratio from 0.97 to 1.62, achieving a recovery rate of 94.93%.
Co-Authors Al Fahmi, Muhammad Ridwan Aleiya, Zakhrofa Anistasia Milandia, Anistasia Anton Sapto Handoko, Anton Sapto Arham, La Ode Aritonang, Partogi A.F. Azwar Manaf Bahfie, Fathan Bambang Suharno Diah Susanti Ediman Ginting Eko Nugroho Erik Prasetyo Firizki, Rayhan Syawal Fitriyanti, Elvira Herlina, Ulin Karo Karo, Pulung Merlinda Intan Fauziah Mesah, Febriyani Prasetyo, Arif Eko Prilitasari, Nurbaity Marsas Shofi, Achmad Sipahutar, Wahyu Solafide Sofi, Achmad Suryalaksana, Alif Triswan Suseno, Triswan Tumpal Ojahan, Tumpal Wahyuningsih Wahyuningsih Widi Astuti Yuhelda Zul Hakim, Hafid Zulqoernain, Muhammad Syahreyzi Pashey