Pengaruh Intensitas Magnet Dan Ukuran Partikel Terhadap Recovery Nikel Dan Kobalt Pada Electric Furnace Slag menggunakan Drum Magnetic Separator

Prasastya, Zafia Henggar (2026) Pengaruh Intensitas Magnet Dan Ukuran Partikel Terhadap Recovery Nikel Dan Kobalt Pada Electric Furnace Slag menggunakan Drum Magnetic Separator. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Indonesia dengan cadangan nikel terbesar di dunia mempunyai peran penting dalam mendukung peningkatan energi terbarukan secara global. Dalam proses pengolahan nikel terutama menggunakan metode Rotary Kiln Electric Furnace (RKEF) terdapat slag sebagai produk samping. Salah satu jenis slag yang dihasilkan yaitu electric furnace slag (EFS) yang masih mengandung senyawa silikat seperti SiO₂, MgO, dan FeO yang membentuk mineral magnesium–besi silikat dan logam berharga seperti nikel (Ni) dan kobalt (Co) yang belum termanfaatkan secara optimal, sehingga berpotensi adanya pengurangan nilai ekonomi. Karakteristik ini menunjukkan bahwa EFS berpotensi diolah kembali sebagai sumber sekunder logam. Penelitian ini bertujuan untuk mengkaji pengaruh variasi ukuran partikel dan intensitas medan magnet terhadap recovery nikel dan kobalt menggunakan metode dry magnetic separation tipe drum magnetic separator. Penelitian ini menggunakan variasi ukuran yaitu 60, 120, 200, 270, 400 mesh dan variasi kuat medan magnetik yaitu 5000, 10000, dan 14000 Gauss. Pada variasi ukuran partikel tidak ada peningkatan terhadap kadar nikel dan kobalt, namun terjadi peningkatan terhadap nilai recovery. Sedangkan pada variasi intensitas magnetik, variasi paling optimal adalah intensitas 10000 Gauss dengan hasil recovery nikel sebesar 91% dan recovery kobalt 70%, terjadi peningkatan kadar nikel yang semula 0,229% menjadi 0,32% dan kadar kobalt yang semula 0,025% menjadi 0,027%. Berdasarkan hasil XRD, fasa dominan yang terkandung di dalam electric furnace slag adalah forsterite (Mg, Fe)2SiO4. Selain itu terdapat beberapa fasa minor yang terdeteksi yaitu pentlandite ((Fe, Ni)9S8), silikon oksida (SiO2), dan olivine (Co2SiO4). Analisis ekonomi pengolahan electric furnace slag melalui dry magnetic separator menunjukkan hasil Internal Rate of Return (IRR) paling optimal adalah -17,1% dan Pay-back Period (PBP) paling pendek adalah 43 tahun.
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Indonesia as the country with the world’s largest nickel reserves, holds a strategic role in supporting the global shift toward renewable energy. In nickel processing, particularly through the Rotary Kiln Electric Furnace (RKEF) method, slag is produced as a by-product. One of the by-products is electric furnace slag (EFS) which still contains silicate compounds such as SiO₂, MgO, and FeO, which form magnesium–iron silicate minerals, along with valuable metals including nickel (Ni) and cobalt (Co) that have not yet been fully recovered. This condition leads to potential economic losses while also indicating that EFS can be reconsidered as a secondary resource for metal extraction. This research aims to investigate the effect of particle size and magnetic field intensity on the recovery of nickel and cobalt using a dry magnetic separation method with drum magnetic separator. This study employs particle size variations of 60, 120, 200, 270, and 400 mesh, along with magnetic field strength variations of 5,000, 10,000, and 14,000 Gauss. The results showed that particle size variation did not lead to an increase in nickel and cobalt grades, although it improved recovery values. In contrast, for magnetic field intensity variation, the optimum condition was achieved at 10,000 Gauss, yielding a nickel recovery of 91% and a cobalt recovery of 70%. Under this condition, the nickel grade increased from 0.229% to 0.320%, while the cobalt grade increased from 0.025% to 0.027%. Based on X-ray Diffraction (XRD) analysis, the dominant phase present in the electric furnace slag was forsterite ((Mg,Fe)₂SiO₄). Several minor phases were also identified, including pentlandite ((Fe,Ni)₉S₈), silica (SiO₂), and cobalt olivine (Co₂SiO₄). Economic analysis of electric furnace slag processing using a dry magnetic separator indicated that the most favorable scenario resulted in an Internal Rate of Return (IRR) of -17.1% and the shortest Payback Period (PBP) of 43 years.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Electric Furnace Slag, Kobalt, Magnetic Separator, Nikel, Recovery Cobalt, Drum Magnetic Separator, Electric Furnace Slag, Nickel, Recovery
Subjects:	T Technology > TN Mining engineering. Metallurgy > TN799.N6 Nickel--Metallurgy
Divisions:	Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Zafia Henggar Prasastya
Date Deposited:	24 Jul 2026 01:23
Last Modified:	24 Jul 2026 01:23
URI:	http://repository.its.ac.id/id/eprint/137012

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