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Journal : Journal of Metallurgical Engineering and Processing Technology

Benefisiasi Bijih Kromit Daerah Paludda Dengan Metode Konsentrasi Gravitasi Suriyanto Bakri; Mohammad Iqbal; Sitti Ratmi Nurhawaisyah; Muhammad Idris Juradi; Hasbi Bakri
Journal of Metallurgical Engineering and Processing Technology Vol 3, No 2 (February 2023)
Publisher : UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v3i2.7309

Abstract

Daerah Palludda Barru terdapat bijih kromit dengan kadar rendah atau belum bisa dimanfaatkan lebih lanjut. Metode yang cocok untuk bijih kromit adalah metode konsentrasi gravitasi dengan meja goyang. Penelitian dilakukan dengan tujuan untuk mengetahui besar peningkatan kadar dan perolehan bijih kromit asal Palludda Barru menggunakan meja goyang dengan menvariasikan sudut kemiringan. Hasil penelitian didapatkan kemiringan optimum pada sudut 10° dengan kadar 35,89% dan recovery 59,06%.
Study of Coal Ash Content Separation in Mallawa Area using The Dense Medium Separation Method Arifin, Mubdiana; Bakri, Suriyanto; Juradi, Muhammad Idris; Nurhawaisyah, Sitti Ratmi; Zulkarnaen, Dina
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 2 (February 2025)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i2.14029

Abstract

Coal remains a major energy source globally, particularly for power generation and industries like iron, steel, chemicals, and cement. Indonesia's coal reserves are widespread, spanning regions such as Aceh, South Sumatra, East Kalimantan, and South Kalimantan. The Mallawa Formation in South Sulawesi also has coal, but it is of low quality due to high ash content, which lowers the calorific value and increases environmental pollution. Therefore, beneficiation is necessary to reduce ash content. The Dense Medium Separation method effectively separates coal from impurity minerals based on density. This study aims to evaluate ash reduction and separation yield across various coal fraction sizes. The coal washing process was conducted on fractions -60+80, -80+100, -100+150, and -150+200 mesh, using a perchloroethylene solution with a density of 1.6 g/ml as the separation medium. Initial coal sample analyses included proximate, calorific value, total sulfur, and mineral matter. Results showed Mallawa coal has 2.94% moisture, 40.60% volatile matter, 47.39% fixed carbon, 9.07% ash, 2.41% total sulfur, and 7053 kcal/kg calorific value, containing quartz, pyrite, calcite, and chlorite minerals. The DMS process on the -150+200 mesh fraction gave the best outcomes, with 50.39% ash elimination and 30.7% yield, making it the optimum size for ash separation in Mallawa coal.