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All Journal Jurnal Inovasi Teknik Kimia IJCR (Indonesian Journal of Chemical Research)
Nafisah, Sayyidatun
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology

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Pengaruh Perlakuan Asam Hidrofluorat terhadap Kandungan SiO₂ dan Al₂O₃ dalam Red Mud untuk Meningkatkan Kadar Fe₂O₃ Nafisah, Sayyidatun; Hidayat, Arif; Khaerudini, Deni Shidqi
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Vol. 10 No. 2 (2025): Volume 10, ISSUE 2, 2025
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol10.iss2.art1

Abstract

Red mud is a solid waste generated from the Bayer process that contains valuable metals such as Fe₂O₃, Al₂O₃, SiO₂, and TiO₂. However, to optimize red mud as an iron source, the high content of silica and alumina must be reduced, as these impurities can lower the efficiency of iron processing. This study aims to evaluate the leaching of red mud using 100 mL of 6.5 M hydrofluoric acid (HF), with variations in red mud mass (10, 20, 25 g) and stirring time (1 to 6 hours), to produce iron-rich residue. XRF analysis showed an increase in Fe₂O₃ content up to 44.65% in the 25 g sample after 6 hours. Al₂O₃ content consistently decreased, while SiO₂ decreased to 20.23% after 4 hours. XRD results revealed that the dominant phases in the residue were hematite, magnetite, and goethite, while silica and alumina phases were diminished. The optimal condition was achieved with 25 g of red mud and 4 hours of reaction time, resulting in high Fe₂O₃ content and low impurities. ICP-MS analysis of the leachate showed increasing Si and Al concentrations with longer reaction times, indicating HF selectively dissolved both elements. The novelty of this research lies in the use of HF to selectively dissolve Si and Al without affecting iron, yielding a residue with potential use as a precursor for magnetite or other iron-based materials. This method effectively reduces impurities and enhances residue quality, supporting sustainable red mud processing and circular economy initiatives.
PENINGKATAN KANDUNGAN BESI PADA LIMBAH PERTAMBANGAN BAUKSIT (RED MUD) DENGAN METODE ACID LEACHING MENGGUNAKAN LARUTAN ASAM FLUORIDA Nafisah, Sayyidatun; Khaerudini, Deni Shidqi; Hidayat, Arif
Jurnal Inovasi Teknik Kimia Vol. 10 No. 4 (2025): October| INTEKA - Jurnal Inovasi Teknik Kimia
Publisher : Fakultas Teknik Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31942/inteka.v10i4.14296

Abstract

Red mud merupakan limbah padat hasil samping industri pengolahan bauksit melalui proses Bayer yang mengandung besi dalam jumlah tinggi, namun bercampur dengan berbagai oksida logam. Penelitian ini bertujuan untuk meningkatkan kandungan besi dalam red mud melalui metode acid leaching menggunakan larutan asam fluorida (HF). Proses leaching dilakukan dalam sistem refluks dengan variasi waktu (1–4 jam) dan konsentrasi asam (12–48%), kemudian residu dianalisis menggunakan X-Ray Fluorescence (XRF) untuk mengetahui perubahan komposisi. Hasil penelitian menunjukkan bahwa peningkatan waktu dan konsentrasi larutan asam mampu memperkaya kandungan Fe₂O₃ dalam residu, dengan nilai maksimum sebesar 45,91% pada kondisi 48% HF dan waktu leaching 4 jam.
Co-Authors Arif Hidayat Deni Shidqi Khaerudini