Reverse leaching of magnesium from ferronickel slag using alkali solvent NaOH

Prasetyo, Agus Budi; Darmawansyah, Rahadian; Mayangsari, Wahyu; Febriana, Eni; Permana, Sulaksana; Maksum, Ahmad; Oediyani, Soesaptri; Firdiyono, Florentinus; Soedarsono, Johny Wahyuadi

doi:10.15587/1729-4061.2020.193885

Cited by 7 publications

(6 citation statements)

References 27 publications

(47 reference statements)

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“…Moreover, the XRD analysis shows olivine ((Mg, Fe) 2 SiO 4 ) as the main phase. The characterizations of raw ferronickel slag correspond to the previous studies [5,23,24].…”

Section: Discussion Of the Results Of Thermal Decomposition Of Ferronickel Slag With Na 2 Co 3 Addition In The Roasting Processsupporting

confidence: 75%

“…This can be proved by the weight loss, the change of elemental content, phase and morphology transformation, as well as proposed reaction mechanism. Previous studies investigated the recovery of Al [7], Cr [4] and Mg separately [23,27]. In this study, the changes of elements content for Al, Cr, Fe and Mg are determined simultaneously.…”

Section: Discussion Of the Results Of Thermal Decomposition Of Ferronickel Slag With Na 2 Co 3 Addition In The Roasting Processmentioning

confidence: 99%

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Decomposition of ferronickel slag through alkali fusion in the roasting process

Mayangsari

Avifah

Prasetyo

et al. 2021

EEJET

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Ferronickel slag is a by-product of the nickel smelting process. Recycling of ferronickel slag is required since it contains valuable elements besides its potency to pollute the environment. In order to take advantage of the valuable materials and reducing the potential hazard, beneficiation of ferronickel slag is essential. Alkali fusion of ferronickel slag using Na2CO3 in the roasting process was carried out. This study aims to determine the decomposition of the mixture of ferronickel slag-Na2CO3 in the roasting process. Roasting temperature and time were 800–1,000 °C and 60‒240 minutes, respectively. Characterizations of the ferronickel slag were conducted by XRF, ICP-OES, XRD and SEM-EDS. Meanwhile, roasted products were characterized using ICP-OES, XRD and SEM-EDS. Characterization of the ferronickel slag indicates that Mg and Si are the main elements followed by Fe, Al and Cr. Moreover, olivine is detected as the main phase. The roasting process caused percent weight loss of the roasted products, which indicates decomposition occurred and affected the elements content, phases and morphology. The roasting process at about 900 °C for 60 minutes is a preferable decomposition base on the process conditions applied and the change of elements content. Aluminum (Al) and chromium (Cr) content in the roasted products upgraded significantly compared to iron (Fe) and magnesium (Mg) content. Olivine phase transforms to some phases, which were bounded with the sodium compound such as Na2MgSiO4, Na4SiO4 and Na2CrO4. The rough layer is observed on the surface of the roasted product as a result of the decomposition process. It indicates that liquid-solid mass transfer is initiated from the surface

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“…Moreover, the XRD analysis shows olivine ((Mg, Fe) 2 SiO 4 ) as the main phase. The characterizations of raw ferronickel slag correspond to the previous studies [5,23,24].…”

Section: Discussion Of the Results Of Thermal Decomposition Of Ferronickel Slag With Na 2 Co 3 Addition In The Roasting Processsupporting

confidence: 75%

Section: Discussion Of the Results Of Thermal Decomposition Of Ferronickel Slag With Na 2 Co 3 Addition In The Roasting Processmentioning

confidence: 99%

Decomposition of ferronickel slag through alkali fusion in the roasting process

Mayangsari

Avifah

Prasetyo

et al. 2021

EEJET

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“…Prior research studies to increase the value of the ferronickel slag have been carried out using pyrometallurgy process [12][13][14] hydrometallurgy process [15,16] as well as combination of both processes [17][18][19]. Generally, flotation process is a commercially pre-tratment that carried out prior pyrometallurgy or hydrometallurgy process to separate or upgrade the specific element.…”

Section: Introductionmentioning

confidence: 99%

Magnesium extraction of ferronickel slag processed by alkali fusion and hydrochloric acid leaching

Prasetyo

Khaerul

Mayangsari

et al. 2021

J min metall B Metall

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A research using ferronickel slag, the by-product of ferronickel production, as raw material for magnesium extraction has been carried out. It is essential to upgrade the value of ferronickel slag instead of used directly for reclamation materials. Moreover, accumulation due to increasing ferronickel demand as well as environmental contamination due to various potencially toxic elements contained in the ferronickel slag could be prevented. The general objective of this study is to utilize the ferronickel slag for magnesium materials. The specific objective is to determine the optimum conditions of magnesium extraction in the process of alkali fusion followed by hydrochloric acid leaching. A novel method for magnesium extraction from ferronickel slag was carried out through reducing silica content followed by acid leaching method. Alkali fusion of the mixture of ferronickel slag and Na2CO3 at 1000 ?C for 60 minutes followed by water leaching at 100 ?C for 60 minutes with solid to liquid percentage of 20 % were carried out to separate the silica. The leaching residue resulted from water leaching was then leached using hydrochloric aid solution to extract magnesium. The leaching temperature and time as well as the hycrochloric acid concentration were varied in the acid leaching process. Alkali fusion process proved can be generated the sodium silicate that can be separated in the water leaching to the leached solution. Meanwhile, the leaching residue was leached using hydrochloric acid to extract the magnesium. The highest magnesium extraction percentage is 82.67% that resulted from an optimum acid leaching condition with temperature of 80 ?C for 30 minutes using 2M HCl solution. Based on the kinetics study, the activation energy (Ea) for the leaching reaction of magnesium at atmospheric pressure between 32?C to 80?C is 9.44 kJ/mol and affected by diffusion and chemical reactions.

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“…Decomposition process can be performed to reduce high energy that is required for the process. Some processes such as alkali roasting [18], reduction process [16], [19] - [21], leaching [12], [22] - [23], and combination of these processes [14] - [15], [24] - [26] were studied. Na2CO3 addition could reduce the melting point of the mixture to about 850 ̊ C [18], [27].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mixing Methods Prior the Decomposition Process on the Decomposed Ferronickel Slag

Wahyu Mayangsari,

Agus Budi Prasetyo,

Eni Febriana

et al. 2023

Acta Metall Slovaca

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Ferronickel slag is a by-product that was obtained from ferronickel production and contains Si and Mg as the main elements. Decomposition process using alkali could decrease energy consumption to process ferronickel slag by decreasing its melting point. The mixing methods prior to the decomposition process could significantly affect interaction between reactants over the process, therefore it is essential to study. The aim of this study is to determine the effect of mixing methods of ferronickel slag and NaOH prior decomposition process on the chemical composition, phase, and microstructure of decomposed ferronickel slag. Two different mixing methods, physical mixing, and impregnation, followed by roasting process at 350 ℃ for 60 minutes were performed, characterized, and analyzed. Thermodynamic analysis was calculated and shows having a good agreement with the characterization results which formation of sodium silicate, magnesium hydroxide and iron oxide were identified. Distribution of product layer of RI can be determined, while spotty decomposition was clearly identified. The effectiveness of impregnation over physical mixing was investigated.

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Reverse leaching of magnesium from ferronickel slag using alkali solvent NaOH

Cited by 7 publications

References 27 publications

Decomposition of ferronickel slag through alkali fusion in the roasting process

Decomposition of ferronickel slag through alkali fusion in the roasting process

Magnesium extraction of ferronickel slag processed by alkali fusion and hydrochloric acid leaching

Effect of Mixing Methods Prior the Decomposition Process on the Decomposed Ferronickel Slag

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