Pengaruh Metode Aktivasi Slag Nickel Matte Terhadap Efisiensi Penangkapan CO2 Melalui Proses Alkali Roasting Berbasis Microwave Muffle Furnace

Seprianto, Seprianto (2026) Pengaruh Metode Aktivasi Slag Nickel Matte Terhadap Efisiensi Penangkapan CO2 Melalui Proses Alkali Roasting Berbasis Microwave Muffle Furnace. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pemanfaatan slag nickel matte sebagai material bernilai tambah masih terkendala oleh rendahnya reaktivitas magnesium karena sebagian besar Mg terikat dalam mineral silikat yang stabil, terutama olivin (Mg₁.₇₈₄Fe₀.₂₁₆SiO₄). Kondisi ini membatasi pelepasan magnesium yang diperlukan dalam proses karbonasi mineral untuk penangkapan CO₂. Penelitian ini bertujuan mengevaluasi pengaruh aktivasi alkali berbantuan microwave muffle furnace terhadap peningkatan desilikasi, perubahan karakteristik mineralogi dan kemampuan slag nickel matte dalam mengikat CO₂. Aktivasi dilakukan menggunakan NaOH dan KOH dengan variasi rasio massa slag terhadap alkali 1:0,5 hingga 1:4, temperatur roasting 200, 300 dan 400°C, serta waktu penahanan 60-180 menit. Produk hasil aktivasi dikarakterisasi menggunakan XRF, XRD dan SEM-EDX untuk menganalisis perubahan komposisi unsur, fase kristal dan morfologi permukaan. Selanjutnya, karbonasi dilakukan didalam reaktor autoklaf pada temperatur 90°C selama 240 menit dengan tekanan CO₂ 4 dan 10 bar. Hasil penelitian menunjukkan bahwa aktivasi alkali berbantuan pemanasan microwave mampu menguraikan struktur silikat sehingga meningkatkan pembentukan fase Mg yang lebih reaktif terhadap CO₂. Penggunaan NaOH menghasilkan desilikasi lebih tinggi dibandingkan KOH. Efisiensi desilikasi tertinggi mencapai 71,13% pada rasio slag 1:2, temperatur 400°C dan waktu roasting 180 menit. Peningkatan tekanan karbonasi dari 4 menjadi 10 bar meningkatkan efisiensi penangkapan CO₂ dari 6,83% menjadi 12,28%, yang dikonfirmasi oleh terbentuknya fase hidromagnesit dan magnesit, penurunan intensitas fase MgO dan perkembangan kristal karbonat pada permukaan partikel. Hasil penelitian menunjukkan bahwa aktivasi alkali berbantuan microwave muffle furnace efektif meningkatkan reaktivitas slag nickel matte terhadap karbonasi mineral serta berpotensi mendukung penyimpanan CO₂ secara permanen dan penerapan ekonomi sirkular di industri metalurgi
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The utilization of nickel matte slag as a value-added material is still hampered by the low reactivity of magnesium, as most of the Mg is bound in stable silicate minerals, particularly olivine (Mg₁.₇₈₄Fe₀.₂₁₆SiO₄). This condition limits the release of magnesium required in the mineral carbonation process for CO₂ capture. This study aims to evaluate the effect of alkali activation using a microwave-assisted muffle furnace on desilication, changes in mineralogical characteristics, and the ability of nickel matte slag to sequester CO₂. Activation was performed using NaOH and KOH with variations in the slag-to-alkali mass ratio ranging from 1:0,5 to 1:4, roasting temperatures of 200, 300, and 400°C, and holding times of 60–180 minutes. The activation products were characterized using XRF, XRD, and SEM-EDX to analyze changes in elemental composition, crystal phases, and surface morphology. Subsequently, carbonation was carried out in an autoclave reactor at 90°C for 240 minutes under CO₂ pressures of 4 and 10 bar. The results of the study show that microwave-assisted alkali activation can break down the silicate structure, thereby promoting the formation of a Mg phase that is more reactive toward CO₂. The use of NaOH resulted in higher desilication compared to KOH. The highest desilication efficiency reached 71.13% at a slag ratio of 1:2, a temperature of 400°C, and a roasting time of 180 minutes. Increasing the carbonation pressure from 4 to 10 bar boosted CO₂ capture efficiency from 6.83% to 12.28%, as confirmed by the formation of hydromagnesite and magnesite phases, a decrease in the intensity of the MgO phase, and the development of carbonate crystals on the particle surfaces. The research results indicate that microwave-assisted alkali activation in a muffle furnace effectively enhances the reactivity of nickel matte slag toward mineral carbonation and has the potential to support permanent CO₂ storage and the implementation of a circular economy in the metallurgical industry

Item Type:	Thesis (Masters)
Subjects:	T Technology > TD Environmental technology. Sanitary engineering > TD794.5 Recycling (Waste, etc.) T Technology > TN Mining engineering. Metallurgy
Divisions:	Faculty of Industrial Technology > Material & Metallurgical Engineering > 27101-(S2) Master Thesis
Depositing User:	Seprianto Seprianto
Date Deposited:	29 Jul 2026 06:49
Last Modified:	29 Jul 2026 06:49
URI:	http://repository.its.ac.id/id/eprint/139019

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