Abstract
At the present paper, synthesis of magnesia from ferronickel smelting slag is discussed. The first stage was extracting magnesium from the slag by leaching in HCl solution. Magnesium extraction of 97% was obtained from the slag leaching with HCl 8 molar, solid:liquid ratio 1:40 (g/ml) and temperature 80 °C after 24 h. Solution purification was performed by adjusting solution’s pH at 95 °C with addition of MgO powder. At pH range range of 3–4, co-dissolved iron was removed as akagenite (β-FeOOH) precipitate. Dissolved nickel precipitation was detected at pH range of 4–6, while dissolved Mg and Al started to precipitate in the forms of pyroaurite (Mg6Fe2CO3(OH)16∙4H2O) and hydrotalcite (Mg6Al2CO3(OH)16∙4H2O) at pH range of 8–9. High purity of brucite (Mg(OH)2) was obtained by Mg precipitation at pH range of 11–12, under stirring speed of 300 rpm and stirring time of 4 h. Calcination of brucite at temperature of 1000 °C completely converted brucite to periclase (MgO) powder after 240 min.
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Acknowledgements
The authors thank PT ANTAM for providing the sample of FeNi smelting slag used in the investigation and Program Penelitian Unggulan Perguruan Tinggi, DIKTI for financial support.
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© 2017 The Minerals, Metals & Materials Society
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Mubarok, M.Z., Yudiarto, A. (2017). Synthesis of Magnesium Oxide from Ferronickel Smelting Slag Through Hydrochloric Acid Leaching-Precipitation and Calcination. In: Zhang, L., et al. Energy Technology 2017. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-52192-3_24
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DOI: https://doi.org/10.1007/978-3-319-52192-3_24
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