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2017 | OriginalPaper | Buchkapitel

Leaching Behavior of Alumina from Smelting Reduction Calcium Aluminate Slag with Sodium Carbonate Solution

verfasst von : Zhifang Tong, Yingjie Li

Erschienen in: Light Metals 2017

Verlag: Springer International Publishing

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Abstract

Leaching behavior of alumina of smelting reduction calcium aluminate slag based on high-iron red mud composition was investigated. Alumina of calcium aluminate slag was leached using sodium carbonate solutions (Na₂CO₃ abbr., Na₂O_c). The effects of Na₂O_c concentration, reaction temperature, reaction time, liquid-solid ratio on the leaching rate of alumina were investigated and its leaching kinetics was studied as well. The results show that the optimum conditions of leaching is reaction temperature of 75 °C, Na₂O_c concentration of 100 g L⁻¹, reaction time of 100 min, liquid-solid ratio of 4.5:1. The leaching rate of alumina is 83.7% under the optimum conditions. It is found that the leaching process can be satisfactorily represented by fitting with Avrami equation. The apparent activation energy of leaching pro cess and the feature parameter of Avrami equation are determined to be 11,844 kJ mol⁻¹ and 0.0983, respectively, the leaching process is inner-difussion controlled.

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Nächstes Kapitel Security Disposal and Comprehensive Utilization of Bauxite Residues

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Titel: Leaching Behavior of Alumina from Smelting Reduction Calcium Aluminate Slag with Sodium Carbonate Solution
verfasst von: Zhifang Tong
Yingjie Li
Verlag: Springer International Publishing
Buch: Light Metals 2017
Print ISBN: 978-3-319-51540-3

Electronic ISBN: 978-3-319-51541-0

Copyright-Jahr: 2017
DOI: https://doi.org/10.1007/978-3-319-51541-0_6

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