Analisis Perfoma Penangkapan Co2 Melalui Aqueous Pressurized Carbonation Dengan Variasi Waktu Dan Tekanan Pada Nickel Matte Slag Teraktivasi Alkali

Cardivest, Nick (2026) Analisis Perfoma Penangkapan Co2 Melalui Aqueous Pressurized Carbonation Dengan Variasi Waktu Dan Tekanan Pada Nickel Matte Slag Teraktivasi Alkali. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Indonesia sebagai produsen nikel terbesar di dunia menghadapi tantangan peningkatan emisi CO₂ yang berasal dari aktivitas peleburan bijih nikel laterit. Salah satu limbah yang dihasilkan adalah nickel matte slag yang mengandung magnesium dan berpotensi dimanfaatkan sebagai material penangkap CO₂ melalui proses mineral karbonasi. Namun, magnesium pada slag umumnya masih terikat dalam struktur silikat yang stabil sehingga diperlukan proses aktivasi untuk meningkatkan reaktivitasnya. Penelitian ini bertujuan untuk mengkaji pemanfaatan nickel matte slag sebagai media penangkap CO₂ melalui kombinasi alkali treatment dan aqueous pressurized carbonation pada variasi tekanan 1, 3, 6, 9, dan 12 bar selama 8 jam. Karakterisasi dilakukan menggunakan XRF, XRD, SEM-EDX, dan TGA. Hasil XRF menunjukkan peningkatan kandungan MgO dari 6,62% menjadi 43,68% setelah alkali treatment dengan nilai Si removal sebesar 83,27%. Analisis XRD menunjukkan transformasi fase mineral dari olivine dan forsterite menjadi periclase (MgO), serta terbentuknya magnesium karbonat (MgCO₃) setelah proses karbonasi. Hasil perhitungan degree of carbonation (DoC) menunjukkan peningkatan seiring kenaikan tekanan, yaitu 3%, 6%, 12%, 28%, dan 36% masing-masing pada tekanan 1, 3, 6, 9, dan 12 bar. Hasil SEM-EDX dan TGA turut mengonfirmasi terbentuknya produk karbonasi pada sampel. Kondisi terbaik diperoleh pada tekanan 12 bar selama 8 jam dengan nilai DoC tertinggi sebesar 36%. Hasil penelitian menunjukkan bahwa nickel matte slag berpotensi dimanfaatkan sebagai material mineral karbonasi untuk penangkapan CO₂ sekaligus meningkatkan nilai tambah limbah industri peleburan nikel.
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Indonesia, as the world's largest nickel producer, faces increasing CO₂ emissions from laterite nickel smelting activities. One of the by-products generated is nickel matte slag, which contains magnesium and has the potential to be utilized as a CO₂ capture material through the mineral carbonation process. However, the magnesium in the slag is primarily bound within stable silicate structures, resulting in low reactivity toward CO₂. Therefore, this study aims to investigate the utilization of nickel matte slag as a CO₂ capture medium through a combination of alkali treatment and aqueous pressurized carbonation at pressures of 1, 3, 6, 9, and 12 bar for 8 hours. Characterization was conducted using X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDX), and Thermogravimetric Analysis (TGA). The XRF results showed an increase in MgO content from 6.62% to 43.68% after alkali treatment, with a Si removal value of 83.27%. XRD analysis revealed the transformation of mineral phases from olivine and forsterite to periclase (MgO), followed by the formation of magnesium carbonate (MgCO₃) after carbonation. The degree of carbonation (DoC) increased with increasing pressure, reaching 3%, 6%, 12%, 28%, and 36% at pressures of 1, 3, 6, 9, and 12 bar, respectively. SEM-EDX and TGA analyses further confirmed the formation of carbonation products in the samples. The optimum condition was achieved at 12 bar for 8 hours, resulting in the highest DoC value of 36%. These findings demonstrate that nickel matte slag has significant potential as a mineral carbonation material for CO₂ sequestration while simultaneously enhancing the value of nickel smelting waste.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Nickel matte slag, Alkali treatment, Aqueous pressure carbonation, Mineral carbonation, CO₂ capture. Nickel matte slag, Alkali treatment, Aqueous pressure carbonation, Mineral carbonation, CO₂ capture.
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:	Nick Cardivest
Date Deposited:	24 Jul 2026 03:30
Last Modified:	24 Jul 2026 03:30
URI:	http://repository.its.ac.id/id/eprint/137032

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