NUR SALSABILA, TIARA (2024) EKSTRAKSI LOGAM BESI DARI RED MUD MENGGUNAKAN METODE REDUCTION ROASTING-MAGNETIC SEPARATION DENGAN PENAMBAHAN KALSIUM KLORIDA DAN KALSIUM FLUORIDA. S1 thesis, Fakultas Teknik Universitas Sultan Ageng Tirtayasa.
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Abstract
The continuous increase in global demand for aluminum, particularly in the transportation, packaging, and construction sectors, results in the generation of approximately 120 million tons of red mud annually. In Indonesia, about 1,75 million tons of red mud were generated in 2020. This waste material contains various valuable elements, classifying it as a potential raw material. Notably, the iron content within red mud can be utilized as a source for iron and steel making. Given the rising domestic demand for steel, this presents a significant opportunity for local steel manufacturers. This study investigates the reduction roasting process of red mud to evaluate the effects of different reductant dosages, the addition of calcium chloride (CaCl₂) and calcium fluoride (CaF₂) additives, and the influence of temperature on the metallization degree, iron recovery, phase transformation, and microstructure of the dried calcine. The raw materials employed in this study included red mud, coal, calcium chloride, and calcium fluoride, which were mixed homogeneously and pelletized into dimensions of 10-15 mm in diameter. The reduction roasting was conducted in a muffle furnace at temperatures ranging from 1050°C to 1250°C for a duration of 60 minutes. Subsequently, a magnetic separation process was implemented on the dried calcine to separate the iron metals from gangue minerals. The results demonstrate that the addition of CaF₂ exhibits superior effects compared to CaCl₂. Specifically, the addition of CaCl₂ yielded lower degrees of metallization and iron recovery than those achieved with CaF₂. Furthermore, higher reduction temperatures are necessary for samples with CaCl₂ to attain elevated metallization degree and iron recovery. Optimal conditions were identified with the addition of 8% CaF₂ and 1 stoichiometric reductant, subjected to a reduction roasting temperature of 1250°C for 60 minutes, resulting in a metallization degree of 93.5%, an iron recovery of 98%, and an iron concentrate with an Fe content of 83.642%.
| Item Type: | Thesis (S1) | |||||||||
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| Additional Information: | Peningkatan permintaan global akan logam aluminium yang terus menerus di bidang transportasi, pengemasan, dan konstruksi, mengakibatkan hampir 120 juta ton red mud dihasilkan setiap tahunnya. Di Indonesia, pada tahun 2020 sekitar 1,75 juta ton red mud dihasilkan. Red mud memiliki kandungan unsur berharga yang beragam sehingga membuat limbah ini tergolong sebagai bahan baku potensial. Salah satu di antaranya yaitu unsur besi dapat dimanfaatkan sebagai sumber bahan baku pembuatan besi dan baja. Mengingat kebutuhan baja nasional yang terus meningkat, pemanfaatan ini merupakan peluang yang sangat baik bagi produsen baja dalam negeri. Pada penelitian ini, proses reduction roasting red mud dilakukan untuk menentukan pengaruh penambahan jumlah reduktor, aditif CaCl2 dan CaF2, dan pengaruh temperatur terhadap derajat metalisasi, recovery Fe, perubahan fasa, dan struktur mikro dried calcine. Bahan baku yang digunakan yaitu red mud, batu bara, kalsium klorida, dan kalsium fluorida dicampur secara homogen serta dipeletisasi dengan ukuran diameter 10-15 mm. Proses reduction roasting dilakukan di dalam muffle furnace pada temperatur 1050-1250°C selama 60 menit. Setelah itu, proses pemisahan secara magnetik dilakukan pada dried calcine untuk memisahkan logam besi dari gangue mineral-nya. Hasilnya menunjukkan bahwa penambahan aditif CaF2 memiliki pengaruh yang lebih baik dibandingkan dengan aditif CaCl2. Penambahan CaCl2 menghasilkan nilai derajat metalisasi dan recovery Fe yang lebih rendah dibandingkan dengan CaF2. Temperatur reduksi yang tinggi diperlukan pada sampel dengan penambahan CaCl2 untuk menghasilkan derajat metalisasi dan recovery Fe yang tinggi. Pada kondisi terbaik untuk 8% CaF2 yaitu penambahan reduktor stoikiometri 1, temperatur reduction roasting 1250°C selama 60 menit dihasilkan nilai derajat metalisasi 93,5%, recovery Fe 98%, dan konsentrat besi yang memiliki kadar Fe 83,642%. | |||||||||
| Subjects: | T Technology > TN Mining engineering. Metallurgy | |||||||||
| Divisions: | 03-Fakultas Teknik > 27201-Jurusan Teknik Metalurgi | |||||||||
| Depositing User: | Miss Tiara Nur Salsabila | |||||||||
| Date Deposited: | 07 Mar 2025 01:14 | |||||||||
| Last Modified: | 07 Mar 2025 01:14 | |||||||||
| URI: | http://eprints.untirta.ac.id/id/eprint/47363 |
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